Showing papers on "Polytetrahydrofuran published in 2017"
TL;DR: In this paper, the degradation of polytetrahydrofuran using heteropolyacids (eg. phosphotungstic acid) as a catalyst was explored via NMR and FT-IR methods.
22 citations
TL;DR: In this article, a star-shaped block copolymers were synthesized according to a core first strategy, with a hydrophobic polytetrahydrofuran (PTHF) central block and a poly(2-methyl-2-oxazoline) (PMeOx) external block.
18 citations
TL;DR: A series of poly(urethane-urea-amide) thermoplastic elastomers (PUUAs) based on polytetrahydrofuran (polytetramethylene glycol, PTMG), nylon-6 and 4,4′-diphenylmethane diisocyanate were synthesized through reactive processing as discussed by the authors.
Abstract: A series of poly(urethane-urea-amide) thermoplastic elastomers (PUUAs) based on polytetrahydrofuran (polytetramethylene glycol, PTMG), nylon-6 and 4,4′-diphenylmethane diisocyanate were synthesized through reactive processing. This method solved the incompatibility of nylon-6 and PTMG, and these model elastomers were used to gain insight into the structure–property relations of block polymers. The target products were solvent resistant, transparent and melting-processable. Fourier transform infrared spectroscopy, XRD, DSC, TEM, dynamic mechanical analysis, tensile testing and TGA were used to study the structure, crystallization, morphology, mechanical properties and thermostability of the PUUAs. The Fourier transform infrared results proved the successful preparation of PUUAs from nylon-6 and PTMG. TEM examination showed that all samples exhibit microphase separated morphology with the nylon-6 domain dispersed in the PTMG phase. The results of tensile testing indicated that the elastomers exhibit excellent mechanical properties with stress at break and strain at break exceeding 40 MPa and 600% respectively. The TGA results implied that the PUUAs can be fabricated by transitional processing at proper temperature without any thermodegradation. These favorable features were related to the microphase separated structure of the PUUAs. © 2016 Society of Chemical Industry
17 citations
17 citations
15 Mar 2017
TL;DR: The stability investigation was conducted at desired temperatures in DMSO solutions of the complexes, and it was found that amylose inclusion supramolecular polymers which were prepared by the vine-twining polymerization using primer-guest conjugates formed films by the acetylation ofAmylose segments had higher storage modulus than that from acetylated amylOSE–PTHF supramolescular polymer, as a function of temperature.
Abstract: This paper describes the evaluation of the stability of amylose-polymer inclusion complexes under solution state in dimethyl sulfoxide (DMSO) depending on guest polymers. The three complexes were prepared by the vine-twining polymerization method using polytetrahydrofuran (PTHF), poly(e-caprolactone) (PCL), and poly(l-lactide) (PLLA) as guest polymers. The stability investigation was conducted at desired temperatures (25, 30, 40, 60 °C) in DMSO solutions of the complexes. Consequently, the amylose-PTHF inclusion complex was dissociated at 25 °C, while the other complexes were stable under the same conditions. When the temperatures were elevated, the amylose-PCL and amylose-PLLA complexes were dissociated at 40 and 60 °C, respectively. We also found that amylose inclusion supramolecular polymers which were prepared by the vine-twining polymerization using primer-guest conjugates formed films by the acetylation of amylose segments. The film from acetylated amylose-PLLA supramolecular polymer had higher storage modulus than that from acetylated amylose-PTHF supramolecular polymer, as a function of temperature.
10 citations
9 citations
Patent•
08 Sep 2017
TL;DR: The waterborne polyurethane resin obtained by the preparation method provided by the invention has the advantages of good alcohol resistance, good normal temperature folding resistance and good wear resistance.
Abstract: The invention provides waterborne polyurethane resin for a synthetic leather fabric and a preparation method of the waterborne polyurethane resin The waterborne polyurethane resin is prepared from the following raw material components in parts by weight: 20 to 50 parts of polyhydric alcohols, 5 to 20 parts of polyisocyanate, 1 to 6 parts of an anionic hydrophilic chain-extending agent, 005 to 02 part of a catalyst, 01 to 03 part of a silane coupling agent, 1 to 4 parts of a salt-forming agent and 1 to 5 parts of a second small molecule chain-extending agent, wherein the polyhydric alcohols comprise hydroxyl-terminated polysiloxanediol, polytetrahydrofuran polyol and polycarbonate diol; the weight ratio of the hydroxyl-terminated polysiloxanediol to the polytetrahydrofuran polyol to the polycarbonate diol is (2 to 6) to (10 to 25) to (18 to 30) The waterborne polyurethane resin obtained by the preparation method provided by the invention has the advantages of good alcohol resistance, good normal temperature folding resistance and good wear resistance; a production process of the preparation method provided by the invention is simple; a large amount of toxic or harmful organic solvents in the production process are avoided, so environmental protection and physical and psychological health of a human body are benefited
6 citations
Patent•
22 Dec 2017
TL;DR: The surface layer polyurethane resin for the waterproof and moisture permeable synthetic leather is made from raw materials comprising polyol, chain extenders, a tri-functionality compound, diisocyanate and a sealing agent as mentioned in this paper.
Abstract: The invention discloses a surface layer polyurethane resin for waterproof and moisture permeable synthetic leather and a preparation method of the polyurethane resin. The surface layer polyurethane resin for the waterproof and moisture permeable synthetic leather is made from raw materials comprising polyol, chain extenders, a tri-functionality compound, diisocyanate and a sealing agent. The polyol contains polyol A and polyol B in a molar ratio of 1:1-1:3, wherein polyol A is selected from one or more of polytetramethylene ether glycol and polytetrahydrofuran propylene epoxide polyether diols, and the polyol B is selected from one or more of polytetrahydrofuran epoxyethane polyether diols, propylene epoxide epoxyethane polyether diols and polyepoxide glycol; the chain extenders comprise a dihydroxyl chain extender and a diamino chain extender; the tri-functionality compound is a trihydroxy compound; and the blocking agent is a monoamine silane coupling agent. The waterproof and moisture permeable polyurethane synthetic leather disclosed by the invention not only has excellent waterproof property and moisture permeability, but also has excellent wear resistance.
6 citations
Patent•
08 Sep 2017
TL;DR: In this paper, a copolymer of a mixture, as an initiator, of polyester polyol or polyether polyol and polytetrahydrofuran glycol and alkylene oxide has been described.
Abstract: The invention belongs to the technical field of polymer synthesis and particularly relates to polyester-polyether polyol, a preparation method thereof as well as prepared high-resilience polyurethane foamed plastic and a preparation method thereof. The polyester-polyether polyol is a copolymer of a mixture, as an initiator, of polyester polyol or polyether polyol and polytetrahydrofuran glycol and alkylene oxide and has a hydroxyl value being 30-75mgKOH/g; the alkylene oxide is ethylene oxide and propylene oxide; and the polyester polyol is prepared by adopting adipic acid, neopentyl glycol, diethylene glycol and epsilon-caprolactone. The polyester-polyether polyol is colorless and transparent and has the characteristics of low content of residual catalyst and stable properties; and the prepared high-resilience polyurethane foamed plastic has the characteristics of good formula latitude, excellent mechanical property and good weatherability.
6 citations
Patent•
08 Mar 2017
TL;DR: In this article, a preparation method of a cationic dye-dyeable polyurethane elastic fiber has been proposed, which can be dyed with a blended polyester at an ordinary pressure.
Abstract: The invention relates to a preparation method of a cationic dyeable polyurethane elastic fiber. The preparation method includes the specific steps of 1), at a prepolymerization reaction stage, preparing an isocyanate-group-terminated prepolymer from diphenyl methane-4,4'-diisocyanate and polytetrahydrofuran glycol, wherein the polytetrahydrofuran glycol contains 1,200-125,000 ppm micromolecular sulfonate-based diol; 2), dissolving the prepolymer prepared in the step 1 by a nonprotic polar solvent so as to obtain a prepolymer solution; 3), adding a chain extender and a chain terminator into the prepolymer solution obtained in the step 2, and conducting polymerization reaction so as to obtain a polyurethaneurea solution; 4), curing a spandex spinning solution prepared in the step 3, and performing a dry spinning method so as to obtain the cationic dyeable polyurethane elastic fiber. The cationic dyeable polyurethane elastic fiber has a cationic dye dyeable function and can be dyed with cationic dyeable blended polyester at an ordinary pressure, so that a 'bare' phenomenon during spandex stretching is prevented.
5 citations
Patent•
15 Sep 2017
TL;DR: In this paper, a post-heat treatment modification method for polyurethane-nanosilver long-acting antibacterial film is presented, which includes the following steps: diisocyanate and polytetrahydrofuran are mixed to react; a cross-linking agent and an acetone solution of a chain extender are added, dimethylolpropionic acid and a catalyst are added and reaction takes place, and a film is formed after uniform stirring, heat treatment is carried out.
Abstract: The invention relates to a method for preparing a polyurethane-nanosilver long-acting antibacterial film by a post-heat treatment modification method, which includes the following steps: (1) diisocyanate and polytetrahydrofuran are mixed to react; a cross-linking agent and an acetone solution of a chain extender are added, dimethylolpropionic acid and a catalyst are added, reaction takes place, and thereby PU (polyurethane) is obtained; a dimethylformamide solution of silver nitrate is added into a polyurethane solution, a film is formed after uniform stirring, heat treatment is carried out, and thereby a polyurethane-nanosilver film is obtained; (2) 4,4'-dihydroxybenzophenone reacts with long-chain alkyl halide, so that 4,4'-bis-long-chain alkoxy benzophenone is obtained; the 4,4'-bis-long-chain alkoxy benzophenone reacts with hydrazine hydrate, so that 4,4'-bis-long-chain alkoxy benzophenone hydrazone is obtained; and the 4,4'-bis-long-chain alkoxy benzophenone hydrazone undergoes oxidation reaction, so that long-chain alkyl diazomethane is obtained; (3) the long-chain alkyl diazomethane is dissolved into a solvent, and is uniformly applied onto the surface of the polyurethane-nanosilver film, and after heat treatment, the polyurethane-nanosilver long-acting antibacterial film is obtained The method can be used for realizing long-acting bacteria resistance
Patent•
24 Nov 2017
TL;DR: In this paper, a preparation method of a thermoplastic polyurethane hot-melt adhesive is described, which includes the following steps: placing polyethylene glycol, polytetrahydrofuran diol, polyester polyol, an antioxidant and an anti-hydrolysis agent in a reaction kettle, and reacting to obtain a polyol component; performing a reaction on the polyol components and metered isocyanate, dropwise adding metered hydroxyethyl methacrylate when the -NCO content is lower than
Abstract: The invention relates to a preparation method of a thermoplastic polyurethane hot-melt adhesive. The preparation method comprises the following steps: placing polyethylene glycol, polytetrahydrofuran diol, polyester polyol, an antioxidant and an anti-hydrolysis agent in a reaction kettle, and reacting to obtain a polyol component; performing a reaction on the polyol component and metered isocyanate, dropwise adding metered hydroxyethyl methacrylate when the -NCO content is lower than a theoretical value, adding a metered photoinitiator and a metered mixed chain extender of BDO and TMP when the -NCO content is lower than the theoretical value, vacuumizing, removing air bubbles, and ending the reaction to obtain a prepolymer; uniformly mixing the prepolymer, the mixed chain extender of the BDO and the TMP, a catalyst, the photoinitiator and a polymerization inhibitor according to a certain mass ratio, and preparing to obtain the polyurethane hot-melt adhesive. The thermoplastic polyurethane hot-melt adhesive prepared by the preparation method provided by the invention has good overall performance such as low melt viscosity, wide melting point range, high strength and the like.
Patent•
22 Aug 2017
TL;DR: In this paper, a method for preparing a polyurethane-nano silver long-lasting antimicrobial film by a modification method after ultraviolet-irradiation was presented, which can achieve long-term anti-microbial.
Abstract: The invention relates to a method for preparing a polyurethane-nano silver long-lasting antimicrobial film by a modification method after ultraviolet-irradiation. The method comprises the steps: (1) conducting a mixed reaction of diisocyanate and polytetrahydrofuran; adding an acetone solution containing a cross-linking agent and a chain extender, adding dimethylol propionic acid and a catalyst to react, and obtaining PU; adding a dimethylformamide solution of silver nitrate to a polyurethane solution, stirring evenly to form a film, conducting heat treatment, and obtaining a polyurethane-nano silver film; (2) reacting 4,4'-dihydroxybenzophenone with long chain haloalkane, and obtaining 4,4'-double-long chain alkoxy benzophenone; reacting the 4,4'-double-long chain alkoxy benzophenone with hydrazine hydrate, and obtaining 4,4'-double-long chain alkoxy benzophenone hydrazone; conducting oxidizing reaction on the 4,4'-double-long chain alkoxy benzophenone hydrazone, and obtaining long chain alkyl diazomethane; (3 ) dissolving the long-chain alkyl diazomethane in solvent, spraying on the surface of the polyurethane-nano-silver film, after ultraviolet-irradiation, and obtaining the product. The invention can achieve long-term anti-microbial.
TL;DR: In this article, the authors adopted water-based polyurethane (PU) to modify the surface of PLA fabrics, thereby enhancing the fabrics' mechanical properties, such as the breaking strength and abrasion resistance.
Abstract: Polylactides (PLAs) are a type of environmental friendly material. PLA fabrics feature excellent performance in terms of texture, comfort, curling effect, crystallinity, and transparency. However, because of its aliphatic polyester structure, PLA is relatively fragile as compared with the commercially available products like PET or Nylon. This study adopted water-based polyurethane (PU) to modify the surface of PLA fabrics, thereby enhancing the fabrics’ mechanical properties. Various polyols such as polytetrahydrofuran (PTMG), polycaprolactone diol (PCL), and polycarbonates diol (PC) were used and various NCO/OH molar ratios were designed in this study. As the PLA fabric was processed by dipping in various PU dispersions, it was found that the breaking strength of the fabric was increased, while its elongation at breakage decreased. Particularly, the breaking strength of the fabric modified by PUD50PC containing 50 weight percent of PC and two other polyols was the most prominent showing an 80 % increase in strength. Furthermore, the abrasion resistance of the PUD50PC-modified PLA fabric showed a roughly 6 times increase as compared to the plain PLA fabric. SEM images also reveal that after processing with water-based PU, the PLA fibers are bonded tightly with the water-based PU molecules to increase the breaking strength of the PLA fabrics.
Patent•
05 Sep 2017
TL;DR: In this article, a cationic waterborne polyurethane-chitosan blend can be obtained through mixing polytetrahydrofuran polyether glycol as a soft segment and isophorone diisocyanate as a hard segment.
Abstract: The invention discloses a cationic waterborne polyurethane-chitosan blend and a preparation method therefor The cationic waterborne polyurethane-chitosan blend can be obtained through mixing a cationic waterborne polyurethane aqueous system, which is obtained through taking polytetrahydrofuran polyether glycol as a soft segment, taking isophorone diisocyanate as a hard segment and taking N-methyldiethanolamine as a hydrophilic chain extender, with an acetic aqueous solution, which is prepared from chitosan with high relative molecular weight, in an aqueous system environment, and subsequently further adopting methods such as film forming and drying According to the cationic waterborne polyurethane-chitosan blend and the preparation method therefor, the difficulty that polyurethanes and hydrophilic chitosan are difficult in solution blending by adopting a cosolvent due to the fact that the polyurethanes are generally lipophilic and hydrophobic materials is overcome, an aqueous blending environment is beneficial to environmental protection, the difficulty that the chitosan cannot be subjected to melt blending with the polyurethanes due to thermal stability is overcome, and then, uniform-blend materials of the chitosan and polyurethane materials are obtained
Patent•
31 May 2017
TL;DR: In this paper, a high solid content two-liquid type adhesive layer polyurethane resin is prepared from the following raw materials: polyhydric alcohols, diisocyanate, a sealing agent and a solvent.
Abstract: The invention discloses high solid content two-liquid type adhesive layer polyurethane resin and a preparation method thereof The high solid content two-liquid type adhesive layer polyurethane resin is prepared from the following raw materials: polyhydric alcohols, diisocyanate, a sealing agent and a solvent, wherein the polyhydric alcohols comprise a polyhydric alcohol A and a polyhydric alcohol B; the polyhydric alcohol A is selected from polyadipic acid ethylene glycol and butanediol copolyester diol, polyadipic acid diglycol ethylene glycol copolyester diol and polytetrahydrofuranether diol or polytetrahydrofuran ethylene oxide copolyether diol; the polyhydric alcohol B is a polyhydric alcohol which contains a side group and is liquid at 20 DEG C By using part of polyhydric alcohols which are liquid at normal temperature, polyurethane resin with the solid content of 80-90% is obtained, and the use amount of the solvent is reduced; when synthetic leather is prepared, by adding a marketed polyfunctionality compound which can be reacted with a isocyanate group as a crosslinking agent (such as triethylene tetramine) into the resin, smooth kink marks of the synthesized leather can be realized without changing the existing process
Patent•
01 Dec 2017
TL;DR: In this article, a blocked double-component, solvent-free, waterproof and moisture-permeable polyurethane resin resins is described, and a method for its preparation is described.
Abstract: The invention relates to the technical field of polyurethane resin preparation, in particular to blocked double-component, solvent-free, waterproof and moisture-permeable polyurethane resin and a preparation method thereof The blocked double-component, solvent-free, waterproof and moisture-permeable polyurethane resin comprises components A and B, wherein the component A is prepared from toluene isocyanate, 4,4-diphenylmethane diisocyanate, an antioxidant, neopentyl glycol polyester polyol, polytetrahydrofuran polyol, polyoxyethylenepolyol, an organic bismuth catalyst and diacetylmonoxime through reactions; the component B is a mixture of diethylenetriamine and isophorone diamine, and the weight percentage of diethylenetriamine is 40%-70%; the weight ratio of the component A to the component B is 1:(005-01) The waterproof and moisture-permeable polyurethane resin has long storage time and stable finished product performance and has excellent moisture permeability, hydraulic pressure resistance and wash resistance
Patent•
25 Aug 2017
TL;DR: In this paper, a flame retardant type thermoplastic polyurethane elastomer and a preparation method thereof were provided, which was obtained from the following raw materials in parts by weight: 22-38 parts of polyhexamethylene adipate glycol, 10-15 parts polytetrahydrofuran glycol and polyoxypropylene glycol.
Abstract: The invention provides a flame retardant type thermoplastic polyurethane elastomer and a preparation method thereof. The flame retardant type thermoplastic polyurethane elastomer is prepared from the following raw materials in parts by weight: 22-38 parts of polyhexamethylene adipate glycol, 10-15 parts of polytetrahydrofuran glycol, 13-20 parts of polyoxypropylene glycol, 32-45 parts of diphenyl methane diisocyanate, 4-8 parts of a chain extender, 0.005-0.012 part of a catalyst, 5-12 parts of a nitrogen-containing halogen-free flame retardant, 10-16 parts of expandable microspheres and 0.5-1 part of an antiaging agent; and the catalyst is prepared from organic tin and organic bismuth with the mass ratio being (3-5) to 1. The thermoplastic polyurethane elastomer prepared by the invention has a micropore structure; through mutual synergistic effect of the nitrogen-containing halogen-free flame retardant and the expandable microspheres, the prepared thermoplastic polyurethane elastomer has excellent flame retardancy, good comprehensive properties and lower tension set characteristic.
Patent•
15 Sep 2017
TL;DR: In this paper, a method for preparing a hydrophobic PU (polyurethane) film by ultraviolet radiation was proposed, which consists of mixing diisocyanate and polytetrahydrofuran to react; adding a crosslinking agent and a chain expander, and then adding dimethylolpropionic acid and a catalyst to react, forming a film, and performing heat treatment, so as to obtain the PU film.
Abstract: The invention relates to a method for preparing a hydrophobic PU (polyurethane) film by ultraviolet radiation. The method comprises the following steps of (1) mixing diisocyanate and polytetrahydrofuran to react; adding a crosslinking agent and a chain expander, and then adding dimethylolpropionic acid and a catalyst to react, so as to obtain the PU; forming a film, and performing heat treatment, so as to obtain the PU film; (2) enabling 4,4'-dihydroxy benzophenone and 1-bromododecane to react, so as to obtain 4,4'-bis-dodecaoxy diphenyl ketone oxime; enabling the 4,4'-bis-dodecaoxy diphenyl ketone oxime and hydrazine hydrate to react, so as to obtain 4,4'-bis-dodecaoxy diphenyl ketone oxime hydrazone; oxidizing the 4,4'-bis-dodecaoxy diphenyl ketone oxime hydrazone, so as to obtain long-chain alkyl diazomethane; (3) dissolving the long-chain alkyl diazomethane into a solvent, uniformly coating to the surface of the PU film, and radiating by ultraviolet rays, so as to obtain the hydrophobic PU film. The method has the advantages that the reaction process is simplified, and the problem of difficulty in synthesizing of the hydrophobic PU film is solved.
Patent•
24 Nov 2017
TL;DR: In this paper, an oil-proofing barrier type wet-process polyurethane resin and a preparation method thereof was presented, where the oil-protective barrier type WPCP was prepared from the following components: diisocyanate, polyol compound, micromolecule dihydric alcohol chain extender, a catalyst, an antioxidant, a closed-type curing agent, a solvent and reaction termination agent methanol.
Abstract: The invention discloses an oil-proofing barrier type wet-process polyurethane resin and a preparation method thereof, wherein the oil-proofing barrier type wet-process polyurethane resin is prepared from the following components: diisocyanate, polyol compound, micromolecule dihydric alcohol chain extender, a catalyst, an antioxidant, a closed-type curing agent, a solvent and reaction termination agent methanol, wherein the polyol compound is polyether diol and polyester diol, the polyether diol is selected from one or two of polytetrahydrofuran diol or polypropylene oxide diol, and the polyester diol is selected from adipic acid diol. By adopting distributive prepolymerization method during the synthesis process of polyurethane, the hardness separation degree of the resin can be improved, the stripping strength of the resin can be guaranteed, and by introducing the later closed-type curing agent, the branching degree and crosslinking degree of the polyurethane resin can be improved, and the migration and precipitation of oily auxiliaries can be blocked.
Patent•
07 Nov 2017
TL;DR: In this article, a polytetrahydrofuran peotopanaxadiol polyurethane elastomer and a preparing method and an application thereof were presented.
Abstract: The invention discloses a polytetrahydrofuran peotopanaxadiol polyurethane elastomer and a preparing method and an application thereof. The elastomer comprises a composition A and a composition B, and the mass ratio of the composition A to the composition B is 100:(16.5-17.5); the composition A comprises polyhydric alcohol and polyisocyanate, and is prepared from, by weight, 100-105 parts of the polyhydric alcohol and 42-43 parts of the polyisocyanate; the polyhydric alcohol is poly tetramethylene oxide, wherein the content of the isocyanate group is 7% by mass, and the hydroxyl value is 109-115 mg KOH/g; the polyisocyanate is diphenylmethane diisocyanate; the composition B comprises poly tetramethylene oxide with the hydroxyl value being 109-115 mg KOH/g, 1,4-butanediol and organic tin catalysts, and is prepared from, by weight, 60-65 parts of the poly tetramethylene oxide, 35-40 parts of the 1,4-butanediol and 2 parts of the organic tin catalysts; according to the elastomer, prepared trundles can be applied to the rugged ground working environment, are great in elasticity, low in starting and rolling resistance and suitable for a cart, and save labor greatly.
Patent•
05 Apr 2017
TL;DR: In this paper, a method for recycling tetrahydrofuran by degrading polytetrahedrofurans was proposed, which has the advantages that the cost is low, yield is high and pollution is avoided.
Abstract: The invention discloses a method for recycling tetrahydrofuran by degrading polytetrahydrofuran. According to the method, the polytetrahydrofuran, a catalyst and organic solvent are sufficiently mixed to prepare a degradation system, degradation is carried out at 90-300 DEG C under normal pressure, and generated tetrahydrofuran is subjected to vapor condensation and collected till the reaction system does not generate vapor any more. The method has the advantages that the cost is low, yield is high and pollution is avoided.
Patent•
29 Mar 2017
TL;DR: In this paper, a polyurethane-polymethyl methacrylate emulsion interpenetrating polymer network is used to reduce the viscosity of polyamide.
Abstract: The invention relates to the field of polyurethane industries, and in particular relates to a preparation method of a polyurethane-polymethyl methacrylate emulsion interpenetrating polymer network. The preparation method comprises the following steps: preparing polyurethane-methyl methacrylate emulsion, to be specific, adding 27g of isophorone diisocyanate, 20g of polytetrahydrofuran glycol and 5g of polyether polyol into a 250mL three-neck flask with a reflux condensing tube, a stirrer and a thermometer, adding two drops of dibutyltin dilaurate as a catalyst, uniformly stirring, reacting for 3-4 hours at the temperature of 90 DEG C till the mass percent of NCO reaches a theoretical value which is 15.9%, cooling to 55 DEG c, dissolving 5.4g of dimethylolpropionic acid in 10g of N, N-dimethylformamide, adding to a reaction system, replenishing two drops of catalyst, and adding 10g of methyl methacrylate again to reduce viscosity. The preparation method has the beneficial effects that the operation is simple, the processing is convenient, the processing quality of the product can be ensured, the product performances are improved, the cost is saved, and the energy consumption is reduced.
Patent•
08 Dec 2017
TL;DR: In this paper, an acid-resistant polyethylene material has been proposed, which has excellent acid resistance and mechanical strength from the following raw material components: polyethylenes, TiO2 modified EPTFE, polyurethane resin, isooctyl polyacrylate, polyhexanediol diacrylated modified phenolic resin, di-isodecyl pentaerythritol diphosphite and zinc stearate.
Abstract: The invention relates to an acid-resistant polyethylene material. The acid-resistant polyethylene material is prepared from the following raw material components: polyethylene, TiO2 modified EPTFE, polyurethane resin, isooctyl polyacrylate, polyhexanediol diacrylate modified phenolic resin, di-isodecyl pentaerythritol diphosphite and zinc stearate, wherein TiO2 modified EPTFE is prepared through reaction of EPTFE, TiO2, polytetrahydrofuran, polymethyl methacrylate and polyvinyl alcohol 2699; the polyurethane resin is prepared through reaction of isophorone diisocyanate, 1,4-butanediol, hexanediol, hydroxyl terminated dimethyl siloxane, dihydroxyl naphthalene and dibutyltin dilaurate; isooctyl polyacrylate is prepared through reaction of isooctyl acrylate, perfluoroalkylethyl acrylate, methyl methacrylate and benzoin methyl ether; the polyhexanediol diacrylate modified phenolic resin is prepared through reaction of phenolic resin, hexanediol diacrylate, phosphate acrylate, tetrahydrofuran acrylate and benzoin methyl ether. The acid-resistant polyethylene material has excellent acid resistance and mechanical strength.
Patent•
01 Aug 2017
TL;DR: In this article, a polyether with a bridge ring structure is described, which serves as an active monomer to be introduced into polyether structure main chain to be synthesized into novel polyether.
Abstract: The invention relates to polyether containing a bridge ring and a preparation method thereof and belongs to the technical field of chemical engineering. The preparation method comprises the steps: firstly synthesizing polypropylene oxide, polyethylene oxide, polytetrahydrofuran or copolymer of the polypropylene oxide, the polyethylene oxide and the polytetrahydrofuran; then performing addition reaction with epoxy norcamphane or derivative of the epoxy norcamphane to obtain polyether of a general formula (1); performing further addition reaction on the polyether of the general formula (1) with propylene epoxide, ethylene oxide or tetrahydrofuran to obtain polyether of a structural general formula (2). According to the polyether disclosed by the invention, a monomer with a bridge ring structure serves as an active monomer to be introduced into a polyether structure main chain to be synthesized into novel polyether. Compared with an ordinary annular structure, the bridge ring structure has higher rigidity and heat resistance; novel polyether amine with moderate strength, toughness and curing speed is obtained after the synthesized polyether is ammoniated; the polyether has wide application prospect in the fields of composite materials, adhesives, coatings and the like.
Patent•
15 Sep 2017
TL;DR: In this article, a method for preparing a hydrophobic PU (polyurethane) film through heat treatment was proposed, which consists of mixing diisocyanate and polytetrahydrofuran for reaction, adding acetone solution of crosslinking agents and chain expanding agents, then, adding dimethylolpropionic acid and catalysts for reaction to obtain PU; then, forming a film; performing heat treatment to obtain the PU film; and finally, dissolving the long chain alkyl diazomethane into a solvent; uniformly
Abstract: The invention relates to a method for preparing a hydrophobic PU (polyurethane) film through heat treatment. The method comprises the following steps of (1) mixing diisocyanate and polytetrahydrofuran for reaction; adding acetone solution of crosslinking agents and chain expanding agents; then, adding dimethylolpropionic acid and catalysts for reaction to obtain PU; then, forming a film; performing heat treatment to obtain the PU film; (2) performing reaction on 4,4'-dihydroxy benaophenonel and long-chain alkylogen to obtain 4,4'-bis-long-chain alkoxy benzophenone; performing reaction on the 4,4'-bis-long-chain alkoxy benzophenone and hydrazine hydrate to obtain 4,4'-bis-long-chain alkoxy benzophenone hydrazone; performing oxidization reaction on the 4,4'-bis-long-chain alkoxy benzophenone hydrazone to obtain long chain alkyl diazomethane; (3) dissolving the long chain alkyl diazomethane into a solvent; uniformly coating the materials onto the surface of the PU film; performing heat treatment; obtaining a finished product. The PU film subjected to hydrophobic modification is changed into the hydrophobic state; the problem of great synthesis difficulty of the hydrophobic PU film is avoided.
Patent•
31 May 2017
TL;DR: In this paper, a preparation method of a waterproof microporous membrane is described, which consists of mixing polyethylene glycol and polytetrahydrofuran glycol to obtain a mixture, dehydrating the mixture, controlling the temperature at 75 to 85 DEG C, adding 4,4'-diphenyl methane diisocyanate, and keeping the temperature constant for at least 30 minutes; adding 1,4-butanediol serving as a chain extender, adding stannous octoate, carrying out stirring, and forming a
Abstract: The invention discloses a preparation method of a waterproof microporous membrane. The preparation method comprises the following steps: (1) mixing polyethylene glycol and polytetrahydrofuran glycol to obtain a mixture, dehydrating the mixture, controlling the temperature at 75 to 85 DEG C, adding 4,4'-diphenyl methane diisocyanate, and keeping the temperature constant for at least 30 minutes; (2) adding 1,4-butanediol serving as a chain extender, adding stannous octoate, carrying out stirring, and forming a membrane when the temperature reaches 120 DEG C, thus obtaining the waterproof microporous membrane. The hemolysis ratio of polyurethane synthesized is less than 5 percent, and the requirement on the hemolytic activity of a biological material can be met; meanwhile, the anti-platelet adhesion property of the material is extremely high.
Patent•
12 Apr 2017
TL;DR: In this article, a soft polyurethane foaming material is characterized by comprising the following in parts by weight: 60 to 90 parts of polytetrahydrofuran polyol A.
Abstract: The present invention provides a soft polyurethane foaming material. The soft polyurethane foaming material is characterized by comprising the following in parts by weight: 60 to 90 parts of polytetrahydrofuran polyol A, 10 to 30 parts of polytetrahydrofuran polyol B, 0 to 5 parts of chain extender, 1 to 30 parts of other auxiliary agents, and 75 to 80 parts of prepolymerized MDI, the molecular weight of the polytetrahydrofuran polyol A ranging from 1000 to 4000, the functionality of the polytetrahydrofuran polyol A being at least 2, an OH value of the polytetrahydrofuran polyol A ranging from 14 to 56 mgKOH/g, the molecular weight of the polytetrahydrofuran polyol B ranging from 500 to 1500, and the functionality of the polytetrahydrofuran polyol B being at least 2. The present invention has the beneficial effects: in the present invention, the traditional polyether polyol is replaced by the two polyether polyols, so as to improve the mechanical performance, and the effect is equivalent to the effect of the traditional polyester polyol; the mechanical performance is improved and the stability of the wet heat compression deformation is ensured, so as to satisfy customer demands; and the specific prepolymerized MDI is used as a polyurethane B component, so as to greatly improve the yellowing resistance performance.
Patent•
01 Feb 2017
TL;DR: In this article, a preparation method of flame-retardant and light-resistant waterborne polyurethane coating is described, which comprises the steps of mixing 06g of a catalyst obtained in the step (1), 80g of polytetrahydrofuran ether glycol and 40g of isophorone diisocyanate in a 500ml four-necked flask provided with a stirring paddle, a temperature gauge and a condenser pipe.
Abstract: The invention discloses a preparation method of flame-retardant and light-resistant waterborne polyurethane coating The method comprises the steps of mixing 06g of a catalyst obtained in the step (1), 80g of polytetrahydrofuran ether glycol and 40g of isophorone diisocyanate in a 500ml four-necked flask provided with a stirring paddle, a temperature gauge and a condenser pipe, carrying out a reaction for 1h at the temperature of 70 DEG C, adding 02g of 2-sulfobenzoic anhydride and 005g of carboxylated graphene sheet obtained in the step (3) into the mixture, and carrying out a reaction for 2h at the temperature of 80 DEG C to obtain a polyurethane prepolymer A; adding 12g of aminobenzene sulfonic acid and 20g of acetone into the polyurethane prepolymer A, carrying out a reaction for 2h at the temperature of 75 DEG C, adding 1g of 2, 4, 6-trihydroxybenzoic acid and 12g of a light-resistant agent obtained in the step (2), carrying out a reaction for 05h at the temperature of 85 DEG C, adding 12g of triethylamine for carrying out a neutral reaction for 30min, and adding 110g of water for emulsifying to obtain the flame-retardant and light-resistant waterborne polyurethane coating The prepared polyurethane coating is environmental-friendly and low in price, is widely used on the surfaces of walls, furniture and metal utensils, and can be used as an adhesive of plastics, glass, papermaking and textile
Patent•
25 Jul 2017
TL;DR: In this article, a super-soft TPU membrane for a U-shaped pillow and a preparation method of the super soft TPU membranes are presented. But the method is not suitable for the U-shape pillow.
Abstract: The invention provides a super-soft TPU membrane for a U-shaped pillow and a preparation method of the super-soft TPU membrane. The super-soft TPU membrane is prepared from the following raw materials: 50-60 parts of diisocyanate, 40-50 parts of polyol, 10-20 parts of polyethylene glycol, 5-10 parts of polytetrahydrofuran glycol, 5-10 parts of a chain extender and 1-3 parts of a catalyst. As for the super-soft TPU membrane provided by the invention, by matching the polyethylene glycol and the polytetrahydrofuran glycol with other components, the tensile strength reaches 39-44MPa, the elongation at break reaches 500-600 percent, the hardness is 45-60A, the water vapor transmission rate reaches up to 8000-10000g/m .24h, and the super-soft TPU membrane has high softness, good toughness and good air and water vapor permeability and is suitable for being used as a material for the U-shaped pillow.