Showing papers on "Terephthalic acid published in 2017"
TL;DR: A facile synthesis method, efficient removal performance and superior reusability indicated that the aromatic acid modified LDH materials had potential application for efficient treatment of organic pollutants in environmental pollution cleanup.
170 citations
TL;DR: Combining Candida antarctica lipase B and Humicola insolens cutinase with CALB reveals synergy for a more complete PET depolymerization to TPA, adding new investigation possibilities for one of the most studied and versatile lipases, CALB.
160 citations
TL;DR: The use of modulators at higher concentrations and with lower pKas leads to the formation of more defects, as a consequence of terephthalic acid ligands being replaced by modulator molecules, thereby enhancing the colloidal stability of the UiO-66 nanoparticles.
Abstract: Nanoscale UiO-66 Zr6(OH)4O4(C8O4H4)6 has been synthesized with a series of carboxylic acid modulators, R-COOH (where R = H, CH3, CF3, and CHCl2). The phase purity and size of each MOF was confirmed by powder X-ray diffraction, BET surface area analysis, and scanning transmission electron microscopy (STEM). Size control of UiO-66 crystals from 20 nm to over 1 μm was achieved, and confirmed by STEM. The colloidal stability of each MOF was evaluated by dynamic light scattering and was found to be highly dependent on the modulator conditions utilized in the synthesis, with both lower pKa and higher acid concentration resulting in more stable structures. Furthermore, STEM was carried out on both colloidally stable samples and those that exhibited a large degree of aggregation, which allowed for visualization of the different degrees of dispersion of the samples. The use of modulators at higher concentrations and with lower pKas leads to the formation of more defects, as a consequence of terephthalic acid ligan...
156 citations
TL;DR: Results from this study indicated that terephthalic acid is the most appropriate OH• probe compound for the characterization of electrochemical and catalytic systems.
Abstract: The detection of hydroxyl radicals (OH•) is typically accomplished by using reactive probe molecules, but prior studies have not thoroughly investigated the suitability of these probes for use in electrochemical advanced oxidation processes (EAOPs), due to the neglect of alternative reaction mechanisms. In this study, we investigated the suitability of four OH• probes (coumarin, p-chlorobenzoic acid, terephthalic acid, and p-benzoquinone) for use in EAOPs. Experimental results indicated that both coumarin and p-chlorobenzoic acid are oxidized via direct electron transfer reactions, while p-benzoquinone and terephthalic acid are not. Coumarin oxidation to form the OH• adduct product 7-hydroxycoumarin was found at anodic potentials lower than that necessary for OH• formation. Density functional theory (DFT) simulations found a thermodynamically favorable and non-OH• mediated pathway for 7-hydroxycoumarin formation, which is activationless at anodic potentials > 2.10 V/SHE. DFT simulations also provided esti...
154 citations
TL;DR: An acid/base co-modulation strategy to the large-scale synthesis of monodisperse UiO-66 crystals with acetic acid for modulating crystal shape and with triethylamine as a base for controlling the nucleation of crystallization and tuning the formation of missing linker defects via promoting presumably the singe deprotonation of terephthalic acid linkers is reported.
Abstract: Beyond their pore structures and surface chemistry, precise controls over other attributes of metal–organic frameworks (MOFs) such as shapes, sizes, and defects are also favorable to their fundamental studies and applications but still remain challenging. Herein, we reported an acid/base co-modulation strategy to the large-scale synthesis of monodisperse UiO-66 crystals with acetic acid for modulating crystal shape and with triethylamine (TEA) as a base for controlling the nucleation of crystallization and tuning the formation of missing linker defects via promoting presumably the singe deprotonation of terephthalic acid linkers. The obtained monodisperse MOF crystals have a well-defined octahedral shape, tunable sizes ranging from ∼500 nm to ∼2 μm, and high thermal stability. Their assembled-monolayers are responsive to methanol vapor with the crystal size-dependent and defect-relevant sensing performances.
126 citations
TL;DR: Satisfactory results were also achieved when the Mn(TPA)-SWCNTs-based sensor was utilized for the determination of Pb2+ in the practical samples of industrial wastewater and human serum, suggesting great promising of the sensor for practical application.
84 citations
TL;DR: In this article, the ability of a cutinase from Thermobifida cellulosilytica (Thc_Cut1) to hydrolyze poly (ethylene terephthalate) (PET) moieties in different polymer blends was investigated.
80 citations
TL;DR: In this paper, a simple wet chemical synthesis of iron oxide (Fe3O4) nanoparticles (NPs) capped with terephthalic acid (TA) and their application for the individual detection of Hg(II), Pb(II) and Cd(II).
77 citations
TL;DR: In this paper, the photo-oxidative desulfurization (PODS) properties of MoO3-metal-organic framework composite photocatalysts were investigated by introducing the proper weight percent of Mo3 into a Zn(II)-based MOF, [Zn(oba)(4bpdh)0.5]n·1.5DMF, for the mineralization of dibenzothiophene from model oil.
Abstract: Photo-oxidative desulfurization (PODS) properties of MoO3–metal–organic framework composite photocatalysts were investigated by introducing the proper weight percent of MoO3 into a Zn(II)-based MOF, [Zn(oba)(4-bpdh)0.5]n·1.5DMF (TMU-5), for the mineralization of dibenzothiophene from model oil. The addition of 3 wt % of MoO3 into a TMU-5 host acting as a crystal growth inhibitor was confirmed by PXRD and BET results. For the first time, under mild and green reaction conditions, 5 wt % MoO3–TMU-5 composite (MT-5) exhibited good photocatalytic activity in the model oil PODS reaction, which has no limitations in the current oxidative desulfurization catalytic systems. Only 3% of the total amount of MoO3 content in the MT catalyst is leached during the reaction. In addition, the rate of PODS of MT-5 obeys a pseudo-first-order equation with an apparent rate constant of 0.0305 min–1 and half-life t1/2 of 22.7 min. Radical scavenger experiments and terephthalic acid fluorescence techniques confirmed that OH• and...
77 citations
TL;DR: These findings open up new possibilities for the conversion of post-consumer PET packages into their minimal monomers, which can be used as drop in at existing industrial facilities.
Abstract: Poly(ethylene terephthalate) (PET) is one of the most consumed plastics in the world. The development of efficient technologies for its depolymerization for monomers reuse is highly encouraged, since current recycling rates are still very low. In this study, 16 commercial lipases and cutinases were evaluated for their abilities to catalyze the hydrolysis of two PET samples. Humicola insolens cutinase showed the best performance and was then used in reactions on other PET sources, solely or in combination with the efficient mono(hydroxyethyl terephthalate)-converting lipase from Candida antarctica. Synergy degrees of the final titers of up to 2.2 (i.e., more than double of the concentration when both enzymes were used, as compared to their use alone) were found, with increased terephthalic acid formation rates, reaching a maximum of 59,989 µmol/L (9.36 g/L). These findings open up new possibilities for the conversion of post-consumer PET packages into their minimal monomers, which can be used as drop in at existing industrial facilities.
72 citations
TL;DR: A chemo‐enzymatic treatment was developed to recover the PET building blocks, namely terephthalic acid (TA) and ethylene glycol, and a Fourier‐transformed Raman method was successfully developed to monitor the monomer and oligomer content in solid samples.
Abstract: Summary
Due to the rising global environment protection awareness, recycling strategies that comply with the circular economy principles are needed Polyesters are among the most used materials in the textile industry; therefore, achieving a complete poly(ethylene terephthalate) (PET) hydrolysis in an environmentally friendly way is a current challenge In this work, a chemo-enzymatic treatment was developed to recover the PET building blocks, namely terephthalic acid (TA) and ethylene glycol To monitor the monomer and oligomer content in solid samples, a Fourier-transformed Raman method was successfully developed A shift of the free carboxylic groups (1632 cm−1) of TA into the deprotonated state (1604 and 1398 cm−1) was observed and bands at 1728 and 1398 cm−1 were used to assess purity of TA after the chemo-enzymatic PET hydrolysis The chemical treatment, performed under neutral conditions (T = 250 °C, P = 40 bar), led to conversion of PET into 85% TA and small oligomers The latter were hydrolysed in a second step using the Humicola insolens cutinase (HiC) yielding 97% pure TA, therefore comparable with the commercial synthesis-grade TA (98%)
22 Feb 2017
TL;DR: In this paper, a straightforward process using 5 −15 wt% NaOH in water and temperature in the range between 70 and 90 °C for the hydrolysis of PET was evaluated on the lab-scale.
Abstract: Most textile waste is either incinerated or landfilled today, yet, the material could instead be recycled through chemical recycling to new high-quality textiles. A first important step is separation since chemical recycling of textiles requires pure streams. The focus of this paper is on the separation of cotton and PET (poly(ethylene terephthalate), polyester) from mixed textiles, so called polycotton. Polycotton is one of the most common materials in service textiles used in sheets and towels at hospitals and hotels. A straightforward process using 5–15 wt% NaOH in water and temperature in the range between 70 and 90 °C for the hydrolysis of PET was evaluated on the lab-scale. In the process, the PET was degraded to terephthalic acid (TPA) and ethylene glycol (EG). Three product streams were generated from the process. First is the cotton; second, the TPA; and, third, the filtrate containing EG and the process chemicals. The end products and the extent of PET degradation were characterized using light microscopy, UV-spectroscopy, and ATR FT-IR spectroscopy, as well as solution and solid-state NMR spectroscopy. Furthermore, the cotton cellulose degradation was evaluated by analyzing the intrinsic viscosity of the cotton cellulose. The findings show that with the addition of a phase transfer catalyst (benzyltributylammonium chloride (BTBAC)), PET hydrolysis in 10% NaOH solution at 90 °C can be completed within 40 min. Analysis of the degraded PET with NMR spectroscopy showed that no contaminants remained in the recovered TPA, and that the filtrate mainly contained EG and BTBAC (when added). The yield of the cotton cellulose was high, up to 97%, depending on how long the samples were treated. The findings also showed that the separation can be performed without the phase transfer catalyst; however, this requires longer treatment times, which results in more cellulose degradation.
TL;DR: The structure and framework composition of the Ce4+ based analogue Ce-CAU-28 are very similar to the ones of the Zr-based compound, but its thermal stability is clearly inferior.
Abstract: A new Zr-based metal–organic framework denoted as Zr-CAU-28 with framework composition [Zr6O4(OH)4(FDC)4(OH)4(H2O)4] (H2FDC = 2,5-furandicarboxylic acid, CAU = Christian-Albrechts-University) was obtained under green synthesis conditions from a mixture of H2O and acetic acid and employing microwave-assisted heating. Zr-CAU-28 is the first Zr-MOF based on H2FDC, which is often considered a promising renewable alternative to terephthalic acid. The crystal structure was determined from powder X-ray diffraction data using a combination of direct methods, force field calculations, and Rietveld refinement. The compound crystallizes in the hexagonal crystal system (space group P63/mmc) with the cell parameters a = 24.9919(9) and c = 24.7688(9) A. The framework structure adopts a kagome-like topology and hence contains large hexagonal channels with a pore diameter of approximately 16 A and small trigonal channels with a size of 3 A. Nitrogen sorption measurements were carried out at −196 °C and gave a specific su...
TL;DR: A metal-free iodine/NaOH-catalyzed oxidation of alcohols and aldehydes has been developed for the practical synthesis of a wide range of carboxylic acids using water as the solvent.
TL;DR: In this article, four metal-organic frameworks (MOFs) were prepared using a simple, low-cost, and high-efficiency technique utilizing simple carboxylic acids (1,3,5-benzenetricarboxyric acid and terephthalic acid) and metal salts (copper(II) acetate tetrahydrate and cobalt(II),acetate tetrahydrate) and microwave-assisted ball milling.
Abstract: In this study, four metal–organic frameworks (MOFs) were prepared using a simple, low-cost, and high-efficiency technique utilizing simple carboxylic acids (1,3,5-benzenetricarboxylic acid and terephthalic acid) and metal salts (copper(II) acetate tetrahydrate and cobalt(II) acetate tetrahydrate) and microwave-assisted ball milling. The MOFs were characterized by infrared spectrometry, X-ray diffraction, scanning electron microscopy, and thermogravimetry. They were investigated for use as adsorbents for the adsorption of Congo red (CR) from aqueous solutions. The results showed that the adsorption capacity of MOF-2—synthesized from trimesic acid and cobalt(II) acetate tetrahydrate—was the highest, reaching 85.54% after 300 min. Electrostatic and π–π stacking interactions are thought to play an important role in the adsorption of CR onto the MOFs. This MOF material reported in this work demonstrates a superior dye adsorption capacity when compared to other adsorbents.
TL;DR: In this article, a bio-based alternative to terephthalic acid was efficiently synthesized by oxidation of HMF using MnFe2O4 spinel structured magnetic nanoparticles (MNPs) and tert-butyl hydroperoxide as an oxidant.
TL;DR: In this paper, the 1D copper(II) coordination polymers were synthesized and tested as homogeneous catalysts for cyanosilylation of a variety of aldehydes to the corresponding cyanohydrin trimethylsilyl ethers.
TL;DR: In this article, six isostructural MIL-101(Cr)-X (X: H, NO2, SO3H, Cl, CH3, and NH2) materials have been prepared directly by the reaction of CrIII salts and the corresponding terephthalic acid or by postsynthetic treatments of preformed MIL 101(Cr) following reported procedures.
Abstract: Six isostructural MIL-101(Cr)-X (X: H, NO2, SO3H, Cl, CH3, and NH2) materials have been prepared directly by the reaction of CrIII salts and the corresponding terephthalic acid or by postsynthetic treatments of preformed MIL-101(Cr) following reported procedures. The materials were characterized by using XRD (crystallinity and coincident diffraction pattern), isothermal N2 adsorption (specific surface areas range from 2740 m2 g−1 for MIL-101(Cr)-H to 1250 m2 g−1 for MIL-101(Cr)-Cl), thermogravimetry (thermal stability up to 400 °C), and IR spectroscopy (detection of the corresponding substituents), and the results were all in agreement with the reported data for these materials. The MIL-101(Cr) materials were tested as heterogeneous catalysts for epoxide ring opening by methanol, benzaldehyde acetalization by methanol, and Prins coupling, observing a clear influence of the substituent that in general follows a linear relationship with the Hammett σmeta constant of the substituent: the catalytic activity increases as the electron-withdrawing ability of the substituents increases. An up to three orders of magnitude enhancement in the presence of the NO2 substituent was found for some of these reactions. The present study illustrates the versatility that metal–organic frameworks offer as heterogeneous catalysts that allow the design of actives sites with adequate properties tuned for each reaction.
TL;DR: The metal-oxide polymer nanocomposite films that were successfully developed show a relatively brighter colour when compared to CuO film, and have excellent mechanical properties, with tensile strength and modulus better than pure films.
TL;DR: It is shown that the use of secondary diols leads to polymers with higher glass transition temperatures than those prepared from their primary diol equivalents, an effect shown to be most pronounced when using the transesterification route.
Abstract: A family of monomers, including 2,5-hexandiol, 2,7-octandiol, 2,5-furandicarboxylic acid (FDCA), terephthalic acid (TA), and branched-chain adipic and pimelic acid derivatives, all find a common derivation in the biomass-derived platform molecule 5-(chloromethyl)furfural (CMF). The diol monomers, previously little known to polymer chemistry, have been combined with FDCA and TA derivatives to produce a range of novel polyesters. It is shown that the use of secondary diols leads to polymers with higher glass transition temperatures (Tg) than those prepared from their primary diol equivalents. Two methods of polymerisation were investigated, the first employing activation of the aromatic diacids via the corresponding diacid chlorides and the second using a transesterification procedure. Longer chain diols were found to be more reactive than the shorter chain alternatives, generally giving rise to higher molecular weight polymers, an effect shown to be most pronounced when using the transesterification route. Finally, novel diesters with high degrees of branching in their hydrocarbon chains are introduced as potential monomers for possible low surface energy materials applications.
TL;DR: In this paper, an online monitoring of aromatic hydrocarbon production via two-step CaO-catalysed pyrolysis of poly(ethylene terephthalate) (PET), employing tandem μ-reactor-gas chromatography/mass spectrometry (TR-GC/MS) was demonstrated.
Abstract: The present work demonstrates the online monitoring of aromatic hydrocarbon production via two-step CaO catalysed pyrolysis of poly(ethylene terephthalate) (PET), employing tandem μ-reactor-gas chromatography/mass spectrometry (TR-GC/MS). PET produces high-boiling terephthalic acid (TPA) during pyrolysis, which hinders the online monitoring of PET pyrolysis. In this work, TR allowed for independent control of the PET pyrolysis and CaO catalytic reaction with a very small sample loading (<1 mg) and split injection into the GC/MS (split ratio 100 : 1) system; thus, fatal line clogging by TPA could be avoided. Thus, we successfully demonstrated the effect of CaO basicity on the time- and temperature-dependent dynamic production of aromatic hydrocarbons. Strongly basic CaO accelerated the decarboxylation of PET pyrolysates to afford useful aromatic hydrocarbons such as benzene, toluene, and styrene with 99.7% selectivity in the oil. In contrast, weakly basic CaO enhanced benzophenone production in preference to benzene formation. The poor deoxygenation ability of the weakly basic CaO increased the concentration of oxygen-containing compounds in the oil. Finally, the time- and temperature-dependent dynamic pathways and the mechanism involving strongly basic/weakly basic CaO were established. These findings allow for a clearer understanding of the nature of PET catalytic pyrolysis, which will be helpful for advancing PET recycling. Furthermore, the novel methodology—online monitoring of a two-step pyrolysis–catalytic upgrading process involving high-boiling compounds—will gain the highest demand in the fields of green chemistry and reaction engineering.
TL;DR: In this paper, the authors investigated the oxidation rate of 5-hydroxymethylfurfural (HMF) to FDCA in acetic acid medium using Co/Mn/Br catalyst.
Abstract: 2,5-furandicarboxylic acid (FDCA) is a potential non-phthalate based bio-renewable substitute for terephthalic acid-based plastics. Herein, we present an investigation of the oxidation rate of 5-hydroxymethylfurfural (HMF) to FDCA in acetic acid medium using Co/Mn/Br catalyst. Transient concentration profiles of the reactant (HMF), intermediates [2,5-diformylfuran (DFF), 5-formyl-2-furancarboxylic acid (FFCA)], and the desired product (FDCA) were obtained for this relatively fast reaction in a stirred semi-batch reactor using rapid in-line sampling. Comparison of the effective rate constants for the series oxidation steps with predicted gas–liquid mass transfer coefficients reveals that except for the FFCA → FDCA step, the first two oxidation steps are subject to gas–liquid mass transfer limitations even at high stirrer speeds. Novel reactor configurations, such as a reactor in which the reaction mixture is dispersed as fine droplets into a gas phase containing oxygen, are required to overcome oxygen starvation in the liquid phase and further intensify FDCA production. © 2016 American Institute of Chemical Engineers AIChE J, 63: 162–171, 2017
TL;DR: Optically responsive, luminescent Ni/Co/Ti layered double hydroxide (LDH), synthesized by a single step hydrothermal route, exhibits highly efficient photodegradation of cationic and anionic dyes, Rhodamine B and Acid Red G, better than that of commercial catalysts like NiO, CoO and TiO2.
Abstract: Optically responsive, luminescent Ni/Co/Ti layered double hydroxide (LDH), synthesized by a single step hydrothermal route, exhibits highly efficient photodegradation of cationic and anionic dyes, Rhodamine B (∼99.8%) and Acid Red G (∼99.6%) respectively, better than that of commercial catalysts like NiO, CoO and TiO2. The LDH has been characterized by using XRD, XPS, PL, TRES, EIS, TEM, SEM-EDX, AFM, UV-visible DRS, N2-sorption desorption, ξ-potential, FT-IR and TG techniques. The characterized results indicate that the LDH possesses hexagonal morphology, a high surface area, a narrow band gap, defect states and oxygen vacancies within its layered framework. The degradations follow the e--h+ hopping pattern and dye-photosensitized mechanistic pathways. The active species generated during photocatalysis have been evaluated using ESR, terephthalic acid fluorescence probe and indirect radical-hole trapping experiments. The colourless end products were investigated by GC-MS and reaction mechanisms have been established for the degradation of the dyes to less toxic and more eco-friendly molecules than their parent analogues. Dye mineralization studies (performed using a TOC analyser) and closure of carbon mass balance experiments quantified the amount of carbon entering and leaving the reaction systems. Reaction mechanisms have been proposed on the basis of the asymmetric cleavage of the dyes. The LDH demonstrated its remarkable efficiency in the field of waste water treatment.
TL;DR: In this article, an extraction and distillation hybrid process using a novel mixed solvent was proposed for enhancing acetic acid recovery during terephthalic acid production, which was designed, simulated, and optimized for two mixed solvents.
Abstract: An extraction and distillation hybrid process using a novel mixed solvent was proposed for enhancing acetic acid recovery during terephthalic acid production. Feasible hybrid extraction–distillation schemes were designed, simulated, and optimized for two mixed solvents, p-xylene + methyl acetate, and p-xylene + ethyl acetate, based on liquid–liquid equilibrium data for a quaternary system containing methyl acetate or ethyl acetate with p-xylene, acetic acid, and water. A hybrid process using the p-xylene + methyl acetate mixed solvent was found to generate the desired purity of acetic acid with a lower energy consumption and higher product yield than conventional extraction processes. Results showed that the proposed hybrid extraction–distillation process improves the process economics remarkably: the hybrid process using the p-xylene + methyl acetate and p-xylene + ethyl acetate mixed solvent reduced a total annual cost by 14% and 6%, respectively, compared with the conventional hybrid process using the ...
TL;DR: In this article, the decarboxylation of 2,5-furandicarboxylic acid (FDCA) has been used widely as alternative material to terephthalic acid to produce polyesters or polyamides.
Abstract: As a bio-based material, 2,5-furandicarboxylic acid (FDCA) has been used widely as alternative material to terephthalic acid to produce polyesters or polyamides In this study, PA10T/10F with melting point higher than 280 °C was produced under existing industrialization process (prepolymerization+solid state polymerization (SSP)), viscosity of which was affected greately by decarboxylation of FDCA TGIR technique was used to study decarboxylation, and 1,10-decanediamine, CO2, H2O and furan derivates can be found, verifying decarboxylation scheme 1H NMR, 13C NMR and 2D NMR analysis showed that nearly half of the feeding FDCA monomers decarboxylates during SSP, instead of entering the polyamide chain, leading to the lower furan moiety ratio in polymers compared to that of feeding ratio However, thermal stability of PA10T/10F polyamide is comparable to PA10T homopolymer, which indicates that FDCA can be a promising base material for heat-resistant polyamide production
TL;DR: In this article, the degradation of terephthalic acid (TPA) has been studied on commercial ZnO immobilized on polystyrene (PS) beads, located in a stainless steel flat plate reactor with an irradiation window realized in a UV transparent polymethylmethacrylate (PMMA UVT) to make the system able to work also at high pressure.
TL;DR: In this paper, three new luminescent metal-organic frameworks (LMOFs), [Zn(L1)2]·CH3CN (1), Zn[L1]2] (2), and NMP (3) have been solvothermally synthesized based on d10 metal ion Zn(II) and free organic ligands (HL1 and H2L2), all of which have been fully characterized.
Abstract: In this report, three new luminescent metal–organic frameworks (LMOFs), [Zn(L1)2]·CH3CN (1), [Zn(L1)2] (2), and [Zn(L1)(L2)0.5]·NMP (3) (HL1 = 6-aminonicotinic acid; H2L2 = terephthalic acid; and NMP = N-methyl-2-pyrrolidone), have been solvothermally synthesized based on d10 metal ion Zn(II) and free organic ligands (HL1 and H2L2) in different solvent systems, all of which have been fully characterized. Single crystal data reveal that 1 and 2 are two 2D isomeride but with different space groups, which is caused by the different solvent systems during the synthesis procedure. The introduction of the bridging ligand H2L2 in the solvent system of 2 produces 3 with the 3D microporous framework. The gas sorption exploration of 3 shows an interesting stepwise gas sorption behavior and attractive low-pressure selectivity between CO2 and CH4, which may be used as a potential material to separate the CO2 from the natural gas. In addition, the luminescent properties of the free ligands and 1–3 have been investigat...
TL;DR: In the present investigation, the effect of gold nanoparticles with appropriate amount and size on the acoustic cavitation activity has been shown by determining hydroxyl radicals in terephthalic acid solutions containing 15, 20, 28 and 35nmgold nanoparticles sizes by using 1MHz low level ultrasound.
TL;DR: In this paper, the Dowex 50 W X8 solid acid catalyst was used to convert D-Fructose to the dialdehyde 5,5′-[oxybis(methylene)]bis[2-furaldehyde] by heating at 110 °C in DMSO with Dowex50 W X 8 solid acid catalysts in 76% yield without the isolation of the intermediate 5-hydroxymethylfurfural.
Patent•
15 Feb 2017
TL;DR: In this article, a lodging-resistant multi-difference polyester low elastic filament is prepared by a special cooling mode and a low-temperature texturing process, which has multiple different properties of different crystallization, different orientation and different shrinkage.
Abstract: The invention relates to a preparation method of a lodging-resistant multi-difference polyester low elastic filament. The preparation method comprises the following steps: firstly, mixing nano sepiolite fibers, organic magnesium hydroxide whisker, organic barium sulfate nano powder, ethylene glycol, propylene glycol, p-hydroxybenzoic acid and sodium germanate to obtain a high-modulus composite alcohol solution; secondly, mixing organic wollastonite nano needle-like fibers, mica powder, polyethylene glycol, the propylene glycol, an antioxidant 1010, ethylene glycol antimony and protonated agent phosphoric acid to obtain a high-modulus composite promoter; thirdly, co-polycondensing the high-modulus composite multifunctional alcohol solution and the high-modulus composite promoter with purified terephthalic acid and the ethylene glycol to obtain high-modulus modified polyester; a melt of the high-modulus modified polyester is sprayed from a T-shaped spinneret orifice in a spinneret plate; the lodging-resistant multi-difference polyester low elastic filament is prepared by a special cooling mode and a low-temperature texturing process. The fiber prepared by the preparation method has multiple different properties of different crystallization, different orientation and different shrinkage; after different shrinkage, the appearance is good, and a brushed fabric prepared from the lodging-resistant multi-difference polyester low elastic filament is not easy to lodge.