Showing papers on "Chemical resistance published in 2013"

High performance moisture cured poly(ether–urethane) amide coatings based on renewable resource (cottonseed oil)

Abstract: In this investigation, polyetheramide resin was prepared through the condensation polymerization of N,N-bis (2-hydroxyethyl) cottonseed oil fatty amide (HECOFA) with bisphenol-A. It was further modified by 2,4-toluene diisocyanate (TDI) in 10–30 wt% of polyetheramide to develop a series of moisture curing urethane-modified polyetheramide resins (UMCOPEtA). The synthesized resin was characterized using 1H NMR, 13C NMR, FTIR and solubility in various organic solvents at room temperature. The thermal and curing behavior of the resin was investigated using thermogravimetric analysis and differential scanning calorimetric techniques. The physico-chemical properties such as hydroxyl value, iodine value, specific gravity and mechanical properties like scratch hardness, impact, and flexibility were determined by standard laboratory methods. Coatings of UMCOPEtA resin were prepared on mild steel panels to evaluate chemical resistance performance against acid, alkali, water and xylene. The newly developed UMCOPEtA coatings showed improved hardness, impact, gloss, water and chemical resistance when compared with unmodified polyetheramide coatings, and thus were found to be suitable as a high performance coating material.

Effect of nanofillers on flame retardancy, chemical resistance, antibacterial properties and biodegradation of wood/styrene acrylonitrile co-polymer composites

Abstract: Wood polymer nanocomposites (WPNCs) based on simul wood (Bombex ceiba, L.) were prepared by impregnation of styrene acrylonitrile copolymer, γ-methacryloyloxy trimethyl silane-modified TiO2, SiO2 nanoparticles and nanoclay intercalating mixture through vacuum impregnation. The impact of nanofillers on the physical properties, flame retardancy, water resistance, anti-swelling efficiency and biodegradability of the resultant WPNCs was investigated. Remarkable enhancement in wood properties such as flame retardancy, water resistance and anti-swelling efficiency was achieved with the treatment. The results showed that all the properties were maximum for wood samples treated with SAN/TiO2 (0.5 %)/SiO2 (0.5 %)/nanoclay (0.5 %). The presence of TiO2 nanoparticles in WPNC exhibited antibacterial activity. The resistance to biodegradation was observed by incorporation of nanofillers into wood.

Powder coating composition, method for producing cured film, and coated article

Abstract: Provided is a powder coating composition in which a fluorine resin layer and a polyester layer separates during the process of melting and curing the powder coating composition and a cured film having excellent water resistance, chemical resistance and weather resistance can be formed with single coat application. The powder coating composition comprises a fluorine resin (A), a polyester polymer (B), a curing agent (C) and an ultraviolet absorber (D), and is characterized in that the polyester polymer (B) includes a unit derived from an aromatic polyvalent carboxylic acid compound having 8 to 15 carbon atoms and a unit derived from a polyalcohol compound having 2 to 10 carbon atoms.

Transparent polyester polyol-based polyurethane coatings: the effect of alcohols

Abstract: A series of polyester polyols were synthesized using 1,6-hexanediol (HDO), 1,4-cyclohexanedimethanol (1,4-CHDM) and trimethylol propane (TMP), alone or in combination with 1,4-cyclohexanedicarboxylic acid and adipic acid. The polyester polyols were reacted with isocyanate trimers to form polyurethane (PU) coatings. Physical properties of the polyesters such as hydroxyl value, acid value, molecular weight, viscosity, and glass transition temperature (T g) had been determined, and the IR spectroscopic analyses of polyesters/PU were reported. The properties (impact resistance, film flexibility, hardness, optical transmittance, chemical resistance, water absorption, thermostability, and phase separation) of the PU coatings so prepared were characterized. The viscosities of polyester polyols were dependent on the structure of the alcohols. Polyester polyol containing only linear aliphatic diol (HDO) was a transparent liquid at room temperature. The viscosity was increased by raising the molar ratio of 1,4-CHDM and/or TMP. All PU coatings had excellent flexibility, impact resistance, and hardness. The coatings derived from diol CHDM had the highest hardness, and the PU derived from diol HDO had the lowest hardness. The chemical resistance and water absorption improved with greater molar ratios of 1,4-CHDM or TMP. Results of differential scanning calorimetry and wide-angle X-ray diffraction indicated that there was no obvious crystallinity in the PU networks. Dynamic mechanical analysis (DMA) results revealed that both CHDM and TMP can increase the T g of PU, and the crosslinking density improved with increased molar ratio of TMP. Atomic force microscope (AFM) and DMA analysis revealed that the PU coatings had no obvious microphase separation, which enabled them to have excellent properties, and the different composition in polyols did not have significant influence on transmittance in the visible region. Results of thermogravimetric measurements indicated that all the PU coatings had good thermal stability.

Polyrotaxane compound, photocurable coating composition, and coated film

Abstract: The present invention relates to a novel polyrotaxane compound having a specific chemical structure, a photocurable coating composition that may provide a coating material having excellent mechanical properties such as scratch resistance, chemical resistance, abrasion resistance, and the like, and excellent self-healing capability, and a coating film obtained from the photocurable coating composition.

Blends containing photoactive additive

Abstract: Polymeric blends having improved flame retardance properties and good ductility at low temperatures are disclosed The blend is formed from (A) a photoactive additive containing a photoactive group derived from a monofunctional benzophenone; and (B) a polymer resin which is different from the photoactive additive The additive can be a compound, oligomer, or polymer When exposed to ultraviolet light, crosslinking will occur between the photoactive additive and the polymer resin, enhancing the chemical resistance and flame retardance while maintaining ductility

Surface morphology and chemistry of epoxy-based coatings after exposure to ultraviolet radiation

Abstract: The effects of ultraviolet (UV) radiation on the surface morphology and the surface chemistry of an epoxy-resin-based coating were characterized with both scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The techniques were applied to follow the chemical changes that occur after different UV-exposure periods. SEM images indicated the generation of “silver cracks” on the surface of the coating as a result of UV-exposure. The shape and width of the cracks were highly related to the UV-exposure period. XPS revealed that the main carbon peak had an unsymmetrical shape due to the large variation in the type of the carbon bonds in the chemical structure of the epoxy resin. Evidence of an oxidation degradation process was observed on the coating surface. The longer the exposure of the coating to UV radiation, the more oxygen bonds were formed, causing the oxygen content to increase and the carbon concentration to decrease. XPS-peak fittings for four carbon bonds were conducted. Results indicated the cleavage of aliphatic carbon–hydrogen (C H) and hydroxyl (C OH) bonds side by side with the formation of carbonyl (C O) and carboxyl (COO) bonds. These changes that occurred on the surface of the epoxy-based coating were stopped after a specific UV-exposure period of time. . Introduction Epoxy resins are a versatile group of cross-linked polymers hat have excellent chemical resistance, good electrical insulating roperties, high adhesion to many substrates, excellent abrasion esistance, high fatigue resistance, low water absorption and can e precisely fabricated. Such resins are considered as a premier election in many fields such as the construction industry where he resins are used mainly in formulating protective coatings for oncrete and steel surfaces [1]. Most epoxy coating formulations are affected by exposure to V, particularly in the presence of air. Chemical changes occurring n epoxy coatings as an effect of UV-exposure can be in the form of hanges in physical and mechanical properties, such as hardness, loss, color [2], static and dynamic strength [3]. Artificial weathering techniques are widely used in simulating he effects of outdoor conditions on polymers [4]. Several types of uorescent UV-lamps are used in both commercial and noncomercial weathering devices. Fluorescent sunlamps, referred to as ∗ Tel.: +966 504630064; fax: +966 26952257. E-mail address: hturaif@kau.edu.sa 300-9440/$ – see front matter © 2013 Elsevier B.V. All rights reserved. ttp://dx.doi.org/10.1016/j.porgcoat.2012.12.010 © 2013 Elsevier B.V. All rights reserved. UVB lamps, with peak emission at 313 nm, are the most widely used. Because of their high flux of short wavelength radiation, UVB sources cause more rapid degradation than solar radiation, which makes UVB sources ideal for accelerated weathering testing of materials (such as polymeric coatings) that are mainly sensitive to the shorter wavelengths [5,6]. Scanning electron microscopy (SEM) was used to study the surface morphology of polymeric coatings after UV exposure [7]. Surface composition before and after UV exposure greatly affects the final properties of epoxy coatings. X-ray photoelectron spectroscopy (XPS) has a wide application in the polymers surface composition determination [8]. Detailed analysis of the C (1s) spectrum of polymer surfaces is a useful method for quantitative determination of the surface composition [9,10]. A sensitive measurement technique such as XPS revealed detailed changes in polycarbonate and vinyl ester resins after UV exposure at early exposure times [11,12]. In this experimental study, an epoxy coating was selected and exposed to UV radiation for different time durations. SEM and XPS techniques were used to investigate the surface morphology and chemistry of the epoxy coatings before and after UV radiation. The physical and chemical composition changes at the surface were observed and elaborated on the following sections.

Polycarbonate resin composition having excellent chemical resistance

Abstract: A polycarbonate resin composition includes: (A) an aromatic polycarbonate in an amount of about 5 to about 95% by weight, (B) a siloxane-based polycarbonate in an amount of about 5 to about 90% by weight, and (C) a syndiotactic polystyrene in an amount of 0 to about 5% by weight. The polycarbonate resin composition can have excellent flowability, injection moldability, impact strength, chemical resistance, and transparency.

Polyamide resin composition and molded article

Abstract: There is provided a polyamide resin composition used to produce a molded product having excellent abrasion resistance, fatigue resistance, heat aging resistance, chemical resistance and surface appearance. The polyamide resin composition, comprises: 100 parts by weight of a (a) polyamide resin; and 0.1 to 10 parts by weight of a (b) hydroxyl group- and carboxyl group-containing compound, wherein the (b) hydroxyl group- and carboxyl group-containing compound has a ratio (COOH/OH) of 0.01 to 5.0 of a rate (percentage) of a carboxyl group-derived peak area to a total peak area in a 13C-NMR spectrum to a rate (percentage) of a hydroxyl group-derived peak area to a total peak area in a 1H-NMR spectrum and has a degree of branching of 0.05 to 0.35.

Metal coating composition

Abstract: The present invention provides a metal coating composition, by applying the metal coating composition even for one time, metal coating with excellent appearance design performance such as metallic appearance and glossiness, and excellent coating film performances such as adhesion with a substrate, chemical resistance, water resistance, weather resistance can be obtained. The metal coating composition is characterized by comprising: (A) a hydroxyl-containing acrylic resin, (B) a polyester resin with an acid value in a range of 90-300mgKOH / g, a number average molecular weight in the range of 750 to 3,000, and a hydroxyl value o in a range o 0 ~ 15mgKOH / g, (C) a brightness pigment and (D) a curing agent. On the basis of a total resin solids of component (A), component (B) and component (D), the solid content of the polyester resin (B) in the coating composition is 1 to 30 mass%.

Acrylic-modified alcohol acid-epoxy ester hybrid resin and paint thereof

Abstract: The invention relates to an acrylic-modified alcohol acid-epoxy ester hybrid resin which is prepared by the following steps: carrying out high-temperature esterification reaction on an epoxy resin and fatty acid under the action of an esterification catalyst to obtain epoxy ester; carrying out alcoholysis on vegetable oil and polyalcohol at high temperature, cooling, and adding polybasic acid for esterification, thereby obtaining an alkyd resin; and adding acrylic monomers into the epoxy ester-alkyd resin mixed solution, and carrying out graft polymerization under the action of an initiator to obtain the hybrid resin The hybrid resin can be used as a main film forming material to prepare a high-temperature baking varnish together with a crosslinking agent The high-temperature baking varnish can be used as various curtain-coating mirror back paints, including silver mirror back paints, aluminum mirror back paints, glass paints and the like, can satisfy the technological requirements for application of curtain coating production lines of which the width exceeds 3m, has a stable curtain coating, and can become completely dry after being baked at 150-130 DEG C for 3-5 minutes The product has the advantages of low-temperature quick drying, high hardness, excellent adhesive force, dampness-heat resistance, chemical resistance, salt-fog resistance and the like

Reinforced high heat resistance and conductivity polyphenyl ether nylon alloy and preparation method thereof

Abstract: The invention relates to a reinforced high heat resistance and conductivity polyphenyl ether nylon alloy. The nylon alloy is prepared from the following raw materials in percentage by weight: 10-50% of polyphenyl ether, 10-40 parts of nylon, 5-30% of conductive agents, 10-40% of reinforced fiber, 5-15% of compatilizers, 2-20% of toughening agents, 0.2-2% of dispersing agents and 0.2-0.6% of antioxidant. The invention also provides a preparation method of the alloy. The nylon alloy has the advantages that as the appropriate compatilizers are adopted, the compatibility between polyphenyl ether and nylon and the glass fiber is improved and the processability of the alloy is optimized; and the polyphenyl ether alloy has the advantages of excellent conductivity, mechanical property, heat resistance, easiness in processing and the like, simultaneously has lower water absorption than the pure nylons and has better dimensional stability, higher strength and more excellent chemical resistance, so the polyphenyl ether alloy has better application prospect.

Inorganic coating composition, and method for forming inorganic layer using the same

Abstract: The present invention relates to an inorganic coating composition and method for forming the inorganic film using the same, to at least one of alkali metal silicate represented by Chemical Formulas 1 to 3; Phosphoric acid (H KOH, NaOH, and either one or more strong base selected from LiOH; And water (H [Chemical Formula 1] xNa2O · ySiO2 · nH2O [Chemical Formula 2] xK2O · ySiO2 · nH2O [Chemical Formula 3] xLi2O · ySiO2 · nH2O Inorganic coating inorganic coating film formed by using the composition even after the adhesive force and adhesive force, etc. is excellent in a long time with a strong binding force with no type of base relationships, in particular made of metal and the base metal surface of the base metal coating layer according to the invention There is a problem that is separated from the base metal organic as well as the removal of other contaminants easily and simply to flow the water is also removed easily contaminants strong weather resistance, durability, wear resistance, and also, the far-infrared radiation hardness of the surface, non-flammable, chemical resistance, corrosion resistance and antibacterial properties provides excellent inorganic coating composition, and inorganic coating film using the same.

Chemically resistant thermoplastic resin composition and molded article prepared from the same

Abstract: PURPOSE: A chemical resistant thermoplastic resin composition is provided to have an excellent property balance including an excellent chemical resistance, transparency, mobility, impact strength, or heat resistance. CONSTITUTION: A chemical resistant thermoplastic resin composition includes (A) thermoplastic aromatic polycarbonate resin; and (B) hydroxy-terminated siloxane and polycarbonate block as a repeating unit. The weight average molecular weight of the hydroxy-terminated siloxane is 2,500-15,000. The viscosity average molecular weight of the thermoplastic aromatic polycarbonate resin (A) is 15,000-40,000. The content of hydroxy-terminated siloxane among polysiloxane-polycarbonate copolymer is 1-10 weight% based on 100.0 weight% of copolymer.

Basalt fiber reinforced polypropylene composite material and preparation method thereof

Abstract: The invention belongs to the field of novel composite material, and in particular relates to a basalt fiber reinforced polypropylene composite material and a preparation method thereof. The composite material comprises the following raw materials, by weight: 50-82.5% of polypropylene, 5-50% of basalt fiber, 0.05-2% of heat stabilizer, 0.05-1% of a processing auxiliary agent, 1-10% of a compatibilizer, 0-20% of a toughening agent and 0-20% of a filler. The preparation method of the basalt fiber reinforced polypropylene composite material comprises the steps of: weighing the above various raw materials according to the ratio; and then adding the weighed raw materials into a double-screw extruder with a draw ratio of 36-40:1 for melt extrusion and granulation. The polypropylene material has excellent chemical resistance, particularly significant acid resistance and alkali resistance, and improved comprehensive mechanical properties, such as bending strength, tensile strength and tensile modulus.

Preparation, characterisation and properties of waterborne fluorinated polyurethane acrylate/SiO2 hybrid

Abstract: Waterborne fluorinated polyurethan acrylate dispersion was prepared from the polyether polyol, isophorone diisocyanate, dimethylpropionic acid, hexafluorobutyl acrylate and trimethylolpropane triacrylate as monomers. Then, the prepolymer containing alkoxysilane Si(OR)3 was synthesised from dispersion and coupling agent methacryloxypropyl trimethoxy silane. The Si(OR)3 group was hydrolysed and reacted with different content tetraethoxysilane hydrolysis solutions in via hybridisation and gelatinous. A series of waterborne fluorinated polyurethane acrylate/SiO2 hybrids were prepared by sol–gel technique. The physical properties of dispersion such as storage stability, viscosity, particle size and surface tension were measured. The results indicated that all the prepared dispersions showed acceptable storage stability. The mechanical properties such as tensile strength, elongation at break and hardness and chemical resistance such as water absorption and acid resistance of the films were investigated....

Modified nylon polyamide 6 (PA6) material for automobile oil pipe and preparation method of modified nylon PA6 material

Abstract: The invention discloses a modified nylon polyamide 6 (PA6) material for an automobile oil pipe, which is prepared from the following raw materials based on parts by weight: 100-110 parts of nylon PA6, 5-10 parts of ethylene propylene diene monomer 4903, 10-12 parts of polybutylece terephthalate (PBT), 3-5 parts of polycaprolactone, 10-15 parts of active calcium, 5-10 parts of nano argil, 1-2 parts of anti-aging agent NBC, 1-2 parts of anti-aging agent MB, 3-5 parts of N-(beta-aminoethyl)-gamma-aminopropyl trimethyl (ethyl) oxysilane, 1-2 parts of dicumyl peroxide (DCP), 1-2 parts of isopropyl bistearoyloxy aluminate, 1-2 parts of modified antioxidant 168, 15-20 parts of modified tree ash, 1-2 parts of antioxidant DLTP, 1-2 parts of adipic acid propylene glycol polyester, 1-2 parts of dioctyl maleate and 3-5 parts of zinc stearate. The antioxidant 168 and the tree ash are added into the modified nylon PA6 material for modification, so that the impact resistance, the toughness and the tensile strength of the nylon material are improved, and the material cost is reduced; and the modified nylon PA6 material has the advantages of good chemical resistance, permeability resistance and wear resistance, excellent size stability, high impact resistance and tensile strength and the like, and is hard to break, thus meeting the demand of the automobile oil pipe.

Nanoscale self-cleaning anti-reflection coating material and preparation method thereof

Abstract: The invention provides a nanoscale self-cleaning anti-reflection coating material and a preparation method thereof and belongs to the field of preparation of inorganic polymers. The nanoscale self-cleaning anti-reflection coating material is prepared from 40 to 65 parts by weight of anhydrous ethanol, 7 to 10 parts by weight of ethyl orthosilicate, 0.5 to 1 part by weight of ammonia water, 3 to 6 parts by weight of a hydrochloric acid solution, 3 to 6 parts by weight of deionized water, 3 to 6 parts by weight of N,N-dimethyl formamide, 2 to 5 parts by weight of polyethylene glycol, 3 to 6 parts by weight of acetylacetone, 11 to 18 parts by weight of butyl titanate and 0.5 to 1 part by weight of a fluorocarbon surfactant. Compared with the prior art, the nanoscale self-cleaning anti-reflection coating material has the characteristics of short aging stage, good stability, excellent self-cleaning performances, excellent adhesion to a base surface, good wear resistance, good chemical resistance, and good ultraviolet aging resistance. After being stood for 24 hours after production, the nanoscale self-cleaning anti-reflection coating material can be coated for use and has a quality guarantee period prolonged from less than 3 months to more than 10 months.

Phase-shift blankmask and method for fabricating the same

Abstract: Provided is a phase-shift blankmask in which a phase-shift layer is formed in at least two continuous layers or a multi-layer film and an uppermost phase-shift layer included in the phase-shift layer is thinly formed to contain a small amount of oxygen (O) so as to enhance chemical resistance and durability thereof. Accordingly, a phase-shift blankmask including the phase-shift layer having enhanced chemical resistance and durability with respect to a cleaning solution containing acid and basic materials, hot deionized water, or ozone water, which is used in a cleaning process that is repeatedly performed during manufacture of a photomask, may be provided using the uppermost phase-shift layer having the enhanced chemical resistance and durability. Furthermore, degradation in the refractive index and degree of phase shift of the phase-shift layer, caused when the cleaning process is repeatedly performed may be prevented due to the uppermost phase-shift layer having the enhanced chemical resistance and durability. Accordingly, a phase-shift blankmask including a thin phase-shift layer can be provided.