122 results about "Dimethyl terephthalate" patented technology

The invention discloses a production method of a PET composite current collector base film with high mechanical property. The base film comprises an outer surface layer, a middle core layer and an inner surface layer, the outer surface layer is composed of PET, fumaric acid, hydroxyl-terminated polybutadiene and an antioxidant; the middle core layer consists of PET (Polyethylene Terephthalate), furandicarboxylic acid, an antioxidant and a stabilizer; the inner surface layer is composed of dimethyl terephthalate, ethylene glycol, spiro diol, ethylene glycol antimony and zinc acetate. The PET composite current collector base film prepared by the preparation method disclosed by the invention has relatively high mechanical properties.

The invention discloses a preparation method of a long-acting antistatic polymer master batch for skin-core spinning polyester, and relates to the technical field of high polymer material preparation. The hard segment comprises the following components: 100 parts of aromatic polyester, the aromatic polyester is generated through a reaction of 100 parts of an aromatic monomer and 80-120 parts of aliphatic dihydric alcohol, the aromatic monomer is dimethyl terephthalate, and the aliphatic dihydric alcohol is 1, 4-butanediol. Through cooperation of the hard segment structure, the soft segment structure, the polyaniline, the protonic acid, the ionic liquid, the fluorine-containing polymer and the sulfonate, the problems that the antistatic performance of the polyester master batch depends on environment humidity, the subsequent process is easy to lose efficacy, and the compatibility with a polyester matrix is poor are solved; the master batch can maintain a stable antistatic effect in a low-temperature and low-humidity environment, the performance of the master batch is not attenuated after subsequent procedures such as elasticizing and printing and dyeing, meanwhile, short filaments and broken filaments are avoided in the spinning process, and the continuity of polyester fiber production and the quality of finished products are improved.

The invention discloses a cool breathable fiber and a preparation method thereof, and relates to the field of fibers. When the cool-feeling breathable fiber is prepared, shell powder sequentially reacts with 3-chloropropyltrimethoxysilane, 2, 6-dihydroxy naphthol and 3, 3-diphenyl-2-propyne-1-alcohol, and functionalized shell powder is prepared; the preparation method comprises the following steps: reacting (formylmethyl) diethyl phosphate with (4-pyridyl) acetone, firstly polymerizing with dimethyl terephthalate and ethylene glycol, and then reacting with N-[4-(aminomethyl) phenyl] guanidine to prepare modified polyester; and finally, mixing the modified polyester, the functionalized shell powder and zinc acetate, and spinning to obtain the cool breathable fiber. The cool breathable fiber prepared by the invention has flame-retardant, durable and antibacterial capabilities.

The invention relates to the technical field of polymeric membrane materials, in particular to a functional packaging membrane material and a preparation method thereof. The packaging film material is prepared from PET, PLA, a modifier and an ultraviolet absorbent, wherein the modifier is formed by grafting dimethyl terephthalate, ethylene glycol and dihydroxyl-terminated polylactic acid to the surface of carboxylated graphene after ester exchange. Under the synergistic effect of the carboxylated graphene nanosheets and the modifier, the uniform dispersion and interface bonding strength of the nanofiller are effectively improved, so that the compatibility of PET (Polyethylene Terephthalate) and PLA (Polylactic Acid) is optimized. According to the structural design, the comprehensive performance such as tensile strength, toughness, gas barrier property and thermal deformation temperature of the composite material can be remarkably improved, and meanwhile, good processability and degradability of the material are guaranteed. The invention provides reliable technical support for developing a novel green packaging film material with high performance and low environmental burden, and has wide industrial application prospect.

The invention discloses an acid and alkali resistant fiber and a preparation method thereof, and relates to the field of fiber fabrics. When the acid and alkali resistant fiber is prepared, dimethyl terephthalate, polyethylene glycol-2000, ethylene glycol, 1, 3-bis (3-hydroxypropyl)-1, 1, 3, 3-tetramethyldisiloxane and diethyl phosphite are polymerized and then react with 4-vinyl benzoyl chloride and 2-mercaptobenzothiazole in sequence, and modified polyester is prepared; the preparation method comprises the following steps: sequentially reacting microcrystalline cellulose with 3-(chloromethyl)-2-hydroxybenzaldehyde, 4-allylthiosemicarbazide and copper chloride to prepare modified cellulose; the modified cellulose and the modified polyester are mixed and subjected to melt spinning, then perfluoroethylene is used for after-finishing, and the acid and alkali resistant fiber is prepared. The acid and alkali resistant fiber prepared by the invention has durable, flame-retardant and antibacterial capabilities.

The invention discloses a method for synthesizing dialkyl terephthalate through waste PET plastic alcoholysis based on a VTa-coated NC / C catalyst, the conversion rate of PET plastic is 100%, the yield of dimethyl terephthalate and ethylene glycol is as high as 99%, no obvious inactivation phenomenon exists after the catalyst is used for 10 times, and the method is suitable for industrial production. The catalytic system is also effective to n-butyl alcohol, 2-ethylhexanol, isononyl alcohol, isodecyl alcohol and ethylene glycol, a series of plastic additives and ethylene glycol can be obtained, and the product yield is 89% or above.

The invention relates to the technical field of high polymer material recovery, in particular to a composite catalyst for preparing DMT through PET alcoholysis and a preparation method and application of the composite catalyst. The composite catalyst comprises a solid acid material which is obtained by carrying out proton transfer reaction on silica gel of which the surface is grafted with aluminum alkyl and perfluoroalkyl sulfonic acid of which the general formula is Rf-SO3H, wherein Rf is a perfluoroalkyl group with the carbon atom number of 1-10. Through the synergistic effect of the components, the composite catalyst shows excellent performance in the process of degrading PET (Polyethylene Terephthalate) by monohydric alcohol. When methanol is used as an alcoholysis agent, the yield of the main product dimethyl terephthalate (DMT) can reach 95% or above, the catalytic efficiency is high, the stability is good, an efficient catalyst is provided for industrialization of chemical recovery of PET, and the method has important economic and environmental values.

The application discloses a kind of encapsulation carrier plate and thermoplastic polyester elastomer material and preparation method, it is related to polymer material technical field.The thermoplastic polyester elastomer material includes following weight parts raw materials: 25-40 parts modified dimethyl terephthalate, 15-25 parts 1, 4-butanediol, 0.07-0.25 parts titanium acid tetraisopropyl ester, 0.25-0.5 parts antioxidant 168, 12-20 parts polytetrahydrofuran ether glycol, 8-15 parts modified 1, 4-butanediol, 1-3 parts isophorone diisocyanate, 5-10 parts basalt fiber, 2-6 parts flake graphite, 2-5 parts tributyl citrate, 1-4 parts methyl phenyl silicone resin, 2-3 parts polyolefin elastomer, 0.2-0.8 parts ultraviolet absorber UV-1577.The thermoplastic polyester elastomer uses modified dimethyl terephthalate and modified 1, 4-butanediol to improve performance, basalt fiber and flake graphite are treated by silanization to enhance compatibility, stepwise temperature control initiation process optimizes grafting uniformity, by double prepolymer melt blending, mechanical properties and stability are considered, the service life is extended by adding antioxidant and ultraviolet absorber.

The application provides a 2-amino terephthalic acid dimethyl ester-tetracyano benzene eutectic crystal as well as a preparation method and application thereof, the eutectic crystal is of a triclinic system, a space group is a cell parameter is alpha = 95.041 (2) °, beta = 90.337 (2) °, gamma = 97.670 (2) °, and a cell volume is The 2-amino terephthalic acid dimethyl ester-tetracyano benzene eutectic crystal provided by the application increases the solid melting point of the organic compound from 133.39 DEG C to 162.23 DEG C without changing the covalent bond of the compound, enhances the thermal stability, and meanwhile, the fluorescence emission color, the fluorescence lifetime and the quantum yield are obviously changed.

The application discloses a preparation method of a dimethyl terephthalate hydrogenation catalyst, which comprises the following steps: (1) adding a cerium salt aqueous solution into an alkali solution, and performing a hydrothermal reaction at 110-140 DEG C; after the reaction is completed, drying the solid in the system, and calcining at 400-600 DEG C for 3-8 hours to obtain a nano-structured cerium dioxide carrier; (2) mixing the cerium dioxide carrier with a ruthenium salt aqueous solution, adding an alkali to control the pH value to be 13-14, drying the obtained solid, and calcining at 450-650 DEG C for 3-8 hours to obtain the target catalyst. The application also discloses a method for preparing dimethyl 1,4-cyclohexane dicarboxylate by hydrogenating dimethyl terephthalate by using the catalyst. When the catalyst is used for hydrogenating dimethyl terephthalate, the catalyst exhibits excellent catalytic performance. In addition, the catalyst has good stability in circulation and application, and has a good industrial application prospect.

The invention discloses a degradable environment-friendly fiber and a preparation method thereof, and relates to the field of fibers. When the degradable environment-friendly fiber is prepared, triethyl phosphite firstly reacts with 3-(2-bromoethyl) thiophene and then reacts with dimethyl terephthalate and ethylene glycol, and modified polyester is prepared; the preparation method comprises the following steps: enabling chitosan oligosaccharide to react with 4-hydroxy-3-pyridylaldehyde, thionyl chloride and 2-(dimethylaminomethyl) thiophene in sequence, so as to prepare functionalized chitosan oligosaccharide; mixing the functionalized chitosan oligosaccharide, zinc acetate and modified polyester, and performing melt spinning to obtain composite fibers; mixing thiophene, ferric chloride and trichloromethane to prepare a thiophene solution; and immersing the composite fiber in a thiophene solution, and drying to obtain the degradable environment-friendly fiber. The degradable environment-friendly fiber prepared by the invention has excellent flame retardance, antibacterial property, antistatic property and light aging resistance.

The present disclosure relates to the formation of dimethyl terephthalate (DMT) and mono ethylene glycol (MEG). The present invention also relates to the depolymerization of polyethylene terephthalate (PET) and the recovery of dimethyl terephthalate (DMT) and mono ethylene glycol (MEG) using sodium methoxide as a catalyst.

The application relates to the technical field of polyester fibers, and discloses a polyester fiber fabric preparation method, which takes N,N'-bis(2-hydroxyethyl)ethylenediamine, N,N'-di-Boc-S-methyl isothiourea and the like as raw materials, and is subjected to esterification polycondensation reaction with dimethyl terephthalate to obtain a waterproof antibacterial copolyester polymer with a similar structure to PET polyester; the waterproof antibacterial copolyester polymer contains quaternary ammonium salt, guanidine and a hydrophobic long-chain structure in the structure, can be uniformly distributed in a polyester fiber matrix, migration of antibacterial groups is avoided, and the antibacterial performance on bacteria is better; the C-F bond energy is high, fluorine atoms are more easily embedded into the polymer, the channel for water molecules to migrate to the inside of the coating is blocked, a stable protective layer can be formed on the surface of the fiber fabric, the fiber is wrapped, water permeation into the fiber is prevented, and thus the waterproof effect is achieved; meanwhile, the hydrophobic layer also has certain durability and can withstand multiple water washes without failure.

The present invention relates to a recycled polyester resin composition comprising recycled dimethyl terephthalate prepared using waste polyester, and a molded article manufactured therefrom. Specifically, according to an embodiment of the present invention, the recycled polyester resin composition includes: a recycled polyester resin including a repeating unit derived from a glycol component and a repeating unit derived from recycled dimethyl terephthalate (rDMT); a hindered phenol-based primary antioxidant; and a phosphorus-based or sulfur-based secondary antioxidant, thereby improving crystallinity, heat resistance, and volatility resistance. Therefore, when a molded article of a headlamp for a vehicle is manufactured using the recycled polyester resin composition, excellent performance can be exhibited.

The application provides a polyester and CO2 co-catalytic conversion method, wherein CO2 reacts with hydrogen to generate methanol under the action of a catalyst, polyester is depolymerized to generate dimethyl terephthalate under the action of methanol, and dimethyl terephthalate is further converted into a hydrogenation product through hydrogenation under the action of a catalyst; the polyester is selected from any one of polyethylene terephthalate (PET) and polybutylene terephthalate (PBT). The application realizes the co-efficient conversion of CO2 and PET or PBT through the series connection of three reactions of CO2 hydrogenation to generate methanol, polyester methanol depolymerization and dimethyl terephthalate hydrogenation, and chemical waste CO2 and PET or PBT plastic can be recycled at the same time.

The invention discloses a display protective film and a preparation method thereof, and relates to the technical field of film materials. When the display protective film is prepared, nano silicon dioxide is sequentially reacted with 2-(p-aminophenyl) ethyltriethoxysilane, 1-pyrazole methanol and zinc chloride to prepare modified nano silicon dioxide; the preparation method comprises the following steps: polymerizing ethylene glycol, dimethyl terephthalate, dimethyl phosphonite and dimethyl 4-pyridyl-4-pimelate to prepare polyester; the preparation method comprises the following steps: reacting polyester with 1-bromohexane to prepare modified polyester; and mixing the modified polyester, the modified nano silicon dioxide and a reversible cross-linking agent, and carrying out melt extrusion, sheet casting and two-way stretching to obtain the display protection film. The prepared display protective film has excellent antibacterial, self-repairing and mechanical properties.

The invention discloses a deodorant skin-friendly fabric and a preparation method thereof, and relates to the field of fiber fabrics. When the deodorant skin-friendly fabric is prepared, microcrystalline cellulose sequentially reacts with ethylene (chloromethyl) dimethoxysilane and 1-amino-4-butylguanidine dihydrochloride, and modified cellulose is prepared; the preparation method comprises the following steps: polymerizing dimethyl terephthalate, 2-vinyl propane-1, 3-diol and ethylene glycol, and reacting with mercaptopropyl methyl dimethoxy silane to prepare modified polyester; the preparation method comprises the following steps: reacting anhydrous citric acid with cysteamine hydrochloride to prepare an ultraviolet absorbent; the preparation method comprises the following steps: reacting 3-[(2, 3)-epoxypropoxy] propyl methyl dimethoxy silane with DOPO (9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide) to prepare modified siloxane; and mixing the modified polyester and the modified cellulose, spinning, and sequentially carrying out surface treatment by using an ultraviolet absorbent and a silane mixed solution to obtain the deodorant skin-friendly fabric. The deodorant skin-friendly fabric prepared by the invention has flame-retardant and durable capabilities.

The invention belongs to the technical field of organic materials, and relates to an organic fluorescent anti-counterfeiting material as well as a preparation method and application thereof, and the organic fluorescent anti-counterfeiting material is prepared by taking a paeonol boron difluoride compound as a guest molecule as well as dimethyl terephthalate (DTT) as a host molecule, the mass ratio of the host molecules to the guest molecules is (100-1000): 1, and the host molecules and the guest molecules are mixed, dissolved and assembled. The fluorescent anti-counterfeiting process has the characteristics of simplicity, convenience, rapidness and high efficiency, and is particularly suitable for application scenes needing rapid verification.

The invention discloses an antibacterial polyester fiber and a preparation method thereof, and relates to the technical field of high polymer materials. When the antibacterial polyester fiber is prepared, 1, 3, 5, 7-tetramethylcyclotetrasiloxane, solid super acid and 1, 3-bis (hydroxypropyl) tetramethyldisiloxane react to prepare hydroxyl-terminated methyl hydrogen-containing silicone oil, and then the hydroxyl-terminated methyl hydrogen-containing silicone oil reacts with dimethyl terephthalate and ethylene glycol to prepare polysiloxane copolyester; the preparation method comprises the following steps: carrying out phosphorus-hydrogen addition modification on polysiloxane copolyester and diphenyl (4-vinyl phenyl) phosphine, and then carrying out quaternary phosphonium modification on the modified polysiloxane copolyester and 4-bromine-butylamine hydrobromide to prepare antibacterial modified copolyester; preparing ZIF-8 powder and loading an anti-aging agent; and finally, mixing the antibacterial modified copolyester and the ZIF-8 loaded with the anti-aging agent, melting and spinning to prepare the antibacterial polyester fiber. The antibacterial polyester fiber prepared by the method has excellent antibacterial, flame-retardant and antioxidant properties and the like.

Provided is a method of collective treatment of organic wastewater discharged in processes of manufacturing purified terephthalic acid (PTA) and dimethyl terephthalate (DMT) which are raw materials for polyethylene terephthalate (PET). The inventors found that collective anaerobic biological wastewater treatment of PTA manufacturing wastewater and DMT manufacturing wastewater enables both the wastewaters to be collectively treated with efficiency more than the conventional efficiency of treatment of PTA manufacturing wastewater. The present invention was thus accomplished.

The invention provides a selective hydrogenation catalyst as well as a preparation method and application thereof. The catalyst takes aluminum oxide as a carrier, platinum group metal as an active component and one or more of sodium, potassium, titanium and lanthanum as auxiliaries; the catalyst comprises an outer layer and an inner layer, and the mass ratio of an active component (in terms of metal elementary substance) to an auxiliary agent (in terms of metal elementary substance) in the outer layer is (30-300): 1, preferably (50-300): 1; in the inner layer, the mass ratio of the active component (in terms of metal elementary substance) to the auxiliary agent (in terms of metal elementary substance) is 1: (60-450), preferably 1: (80-450). The noble metal active components in the catalyst are highly uniformly dispersed, and the active components are mainly and intensively distributed on the outer layer of the catalyst, so that the catalyst shows good activity and stability when being applied to the process of preparing 1, 4-cyclohexanedicarboxylic acid dimethyl ester through selective hydrogenation of dimethyl terephthalate.

The invention relates to the technical field of polyester waste recycling, in particular to an acid-base double-site metal-free catalyst as well as a preparation method and application thereof. The acid-base double-site metal-free catalyst provided by the invention is suitable for oxidative depolymerization of polyester, especially polyethylene glycol terephthalate, is low in catalyst dosage, and has the characteristics of excellent reaction kinetics performance, environmental protection property and recyclability. When the temperature is 180 DEG C and the mass ratio of the PET waste to the catalyst is 100: 1, the reaction is carried out for 30 minutes, the PET degradation rate is 99.97%, the ethylene glycol yield is 91.53%, and the dimethyl terephthalate yield is 90.62%. The mass ratio of the PET waste to the catalyst is further increased to 150: 1, and the PET degradation rate is still kept at 97.68%, so that the acid-base double-site metal-free catalyst provided by the invention has excellent depolymerization performance under the condition of high PET loading capacity.

The invention discloses a fireproof flame-retardant fiber and a preparation method thereof, and relates to the technical field of fibers. When the fireproof and flame-retardant fiber is prepared, luteolin and 3-chloro-1-propylene are subjected to a reaction, and modified luteolin is prepared; the modified luteolin and zinc acetate are subjected to a reaction, and a luteolin complex is prepared; the preparation method comprises the following steps: reacting pyridinium salt dimethyl pimelate, dimethyl terephthalate, 1, 6-hexanediol and dihydroxy DOPO (9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide) to obtain copolyester; acrylic acid is polymerized and coated on the surface of magnesium hydroxide to prepare modified magnesium hydroxide; and uniformly mixing the modified magnesium hydroxide, a luteolin complex and copolyester, carrying out melt spinning, and treating with azodiisobutyronitrile to obtain the fireproof flame-retardant fiber. The fireproof flame-retardant fiber prepared by the invention has excellent flame retardance, antibacterial property and mechanical strength.

The present application relates to a kind of reactive polyester and its preparation method, water-based resin and its application.The double end group of the reactive polyester contains double bond and sodium sulfonate structure, and the preparation method is as follows: under the protection of atmosphere, 3-allyloxy-1-hydroxy-1-propane sodium sulfonate, dimethyl terephthalate and organic tin catalyst are mixed to react, to obtain intermediate product;Ethylene glycol is added to the intermediate product to react, to obtain reactive polyester.The reactive polyester in the present application contains double bond and sodium sulfonate in double end group, can be applied as emulsifier, can also be applied as stabilizer, in addition, it can also be chemically bonded with double bond containing polyester.The water-based resin does not need to introduce other emulsifier and stabilizer when being used, and the reactive polyester segment and polyacrylic acid segment can be chemically bonded, the water-based resin formed has good compatibility, high transparency, and when being used as adhesive, can effectively improve the bonding effect.

The invention relates to the technical field of detection, in particular to a method for determining the content of propargyl and / or isopropargyl by using nuclear magnetic resonance. The method comprises the following steps: preparing a detection solution by taking dimethyl terephthalate as an internal standard substance and propargyl or isopropargyl as a detection sample, then carrying out nuclear magnetic resonance measurement, respectively establishing linear regression equations, and determining that the isopropargyl is Y1 = 0.2214 X1-0.0236 and R12 = 0.99082; the Y2 is equal to 0.6524, the X < 2 > is equal to 0.0104, and the R22 is equal to 0.99981. Then performing NMR measurement on a to-be-measured solution to obtain a quantitative peak area, and substituting the quantitative peak area into the equation to obtain the content. According to the method, a standard substance is not needed, a specific quantitative peak is selected to avoid interference, the detection linear range is 0.05 mg / mL-20 mg / mL, the detection limit is 0.02 mg / mL, operation is easy and convenient, cost is low, accuracy and reliability are achieved, and the method is suitable for content detection of propargyl and / or isopropargyl.

The present application relates to a method for uniform diffusion of multiphase materials in a reactor during dimethyl terephthalate hydrogenation process. In the present application, DMT solution and hydrogen are respectively exchanged with DMCD, mixed after heat exchange, heated to the required reaction temperature through a preheater, and then enter the reactor from the top under certain pressure conditions. The mixed multiphase materials pass through the step-by-step distributor to the catalyst bed in the trickle bed hydrogenation reactor, uniformly react with the catalyst, and then are purified by rectification after the reaction is completed, and continue to enter the second hydrogenation reaction to generate CHDM. The method of the present application can make the high condensation point raw material mixed with hydrogen to contact with the catalyst in a continuous, stable and uniform dispersion state, avoid excessive reaction, intense heat release, increase of by-products, runaway of temperature, and influence on the yield of intermediate products. The method of the present application makes the heat release of the catalyst bed uniform during the reaction process, and the hydrogenation effect is excellent.

The application discloses a PET degradation catalyst, a preparation method thereof and application of the PET degradation catalyst in a DMT preparation process based on PET degradation. The preparation method comprises the following steps: fully cleaning industrial waste residues, drying the waste residues, ball-milling and sieving the waste residues, fully mixing the waste residues with organic acid, drying the waste residues, and performing heat treatment on the waste residues under an inert atmosphere to obtain a PET degradation catalyst with calcium oxide / carbon composite. The catalyst is applied to PET methanolysis, and the obtained dimethyl terephthalate has a purity of 98-99% and a yield of 90-95%. In addition, graphite contained in the waste residues can adsorb dyes carried by PET in the degradation process, so that a subsequent decoloring treatment process is omitted. The PET degradation catalyst has high degradation capacity for PET, and the obtained product has high purity and yield, and the process is simple, raw materials are cheap, and the PET degradation catalyst has a good application prospect.

The present invention provides an EG copolymer PBT composition that exhibits excellent molding cycle characteristics, interlocking properties and hinge characteristics of the resulting molded articles, and is easily converted to high molecular weight by solid-phase polycondensation. [Solution] A method for producing an ethylene glycol copolymerized polybutylene terephthalate composition, comprising the step of reacting ethylene glycol with dimethyl terephthalate and / or terephthalic acid and 1,4-butanediol, and then reacting the resulting reaction product with ethylene glycol. A method for producing an ethylene glycol copolymerized polybutylene terephthalate composition, comprising the step of reacting dimethyl terephthalate and / or terephthalic acid and 1,4-butanediol, and then reacting the resulting reaction product with ethylene glycol, dimethyl terephthalate and / or terephthalic acid and 1,4-butanediol.

The application provides a kind of catalyst and the preparation method of 1,4-cyclohexane dimethanol by one-step hydrogenation of dimethyl terephthalate, and the preparation of the catalyst comprises: carbon nanotubes are treated with acid, reacted with Sn salt and citric acid to obtain a carrier, Rh salt is mixed with NH4ReO4 to co-precipitate and react to obtain a metal nanocluster solution, which is added dropwise into the dispersion of the carrier, and then heat-treated to obtain the catalyst. The above-mentioned catalyst catalyzes the one-step hydrogenation of dimethyl terephthalate to prepare 1,4-cyclohexane dimethanol. The metal Re in the catalyst can have a synergistic effect with Rh, promoting the ring hydrogenation catalytic activity of Rh for DMT. During the preparation process, the CNTs modified by nitric acid produce hydrophilic surface functional groups -COOH, -OH and -COR, which improve the dispersion of the metal in the CNTs, the adsorption performance of the raw material dimethyl terephthalate, and the catalytic hydrogenation activity of the catalyst is significantly improved.