66 results about "Dimethyl terephthalate" patented technology

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 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 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 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.

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 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 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.

The present invention relates to the field of recycling materials containing polyester terephthalate, particularly polyethylene terephthalate (PET), polybutylene terephthalate (PBT), or polytrimethylene terephthalate (PTT), commonly used in the manufacture of disposable plastic bottles, food trays, textiles, and composite insulation materials. It specifically concerns a process for recycling PET into terephthalic diester, and in particular dimethyl terephthalate (DMT), in less than one hour and without any pretreatment steps. Furthermore, this process uses products with a low environmental impact. It is therefore particularly advantageous from an industrial perspective.

The present application belongs to the technical field of polyester copolymerization modification, and relates to a polyester-polycarbonate with a block structure, a preparation method and application thereof. The preparation method is as follows: first, a mixture of components A and B is obtained by reacting 1,4-butanediol, dimethyl carbonate and trimethyl citrate as raw materials; then, component C is obtained by reacting 1,4-butanediol and X as raw materials, wherein X is dimethyl terephthalate or terephthalic acid; and finally, the polyester-polycarbonate with a block structure is obtained by mixing the mixture of components A and B with component C and then performing polycondensation reaction. The polyester-polycarbonate with a block structure is prepared by using the preparation method. A skin-core fiber is prepared by using the polyester-polycarbonate with a block structure as the skin layer material. The branched structure of the polyester-polycarbonate with a block structure is uniform, and the skin layer and the core layer of the skin-core fiber are both polyester materials, so that the skin-core fiber has good interface compatibility.

The present invention relates to the field of the recycling of materials comprising terephthalate polyester, notably polyethylene terephthalate (PET) or polybutylene terephthalate (PBT) or polytrimethylene terephthalate (PTT), which are commonly used for the manufacture of disposable plastic bottles, food trays, textiles, composite material for insulation, etc. The invention notably relates to a method for recycling PET to a terephthalic diester and notably to dimethyl terephthalate (DMT) in less than one hour and without a pretreatment step. In addition, this method uses products with low environmental impact. It is therefore particularly advantageous from an industrial viewpoint.

The application discloses a hindered amine polymer material and a preparation method and application thereof. The hindered amine polymer material is a modified polyester prepared through copolymerization of an oligomer polyester and a piperidine derivative, wherein the oligomer polyester is an oligomer PBT or an oligomer PET; or, the hindered amine polymer material is prepared through copolymerization of an oligomer polymer, wherein the oligomer polymer is prepared through polycondensation of terephthalic acid or dimethyl terephthalate, a diol and a piperidine derivative, wherein the diol is 1,4-butanediol or ethylene glycol; and the piperidine derivative has a structure shown in formula I or formula II. Compared with a conventional physically mixed polymer material, the weather resistance and migration resistance of the polymer material prepared through copolymerization are significantly improved.

The invention relates to the technical field of chemical detection, in particular to a method for analyzing sample components containing one or more of 1, 4-cyclohexanedimethanol, dimethyl 1, 4-cyclohexanedicarboxylate and dimethyl terephthalate. The analysis method comprises the following steps: sample pretreatment: pretreating a sample to obtain a liquid without mechanical impurities as a sample to be detected; determining and analyzing a to-be-detected sample: injecting the to-be-detected sample into a gas chromatograph for detection, and determining the nature by using an external standard method; the detection conditions are as follows: the detector is FID, and the temperature of the FID is 295-320 DEG C. The analysis method disclosed by the invention is simple, good in reproducibility, high in sensitivity, good in stability, simple to operate and high in analysis speed, can meet the analysis requirements of 1, 4-cyclohexanedimethanol, raw materials thereof and raw material hydrogenation products or samples containing or partially containing similar components, and omits the tedious operation of selecting and adding internal standard substances.

The application provides a synthesis method of dimethyl terephthalate, which comprises the following steps: adding a sulfonic acid catalyst into methanol and terephthalic acid to perform a first esterification reaction to obtain a first esterification product; adding methanol into the first esterification product to perform a second esterification to obtain a second esterification product; adding methanol into the second esterification product to perform crystallization to obtain a crystallization product; and performing distillation on the crystallization product to obtain dimethyl terephthalate; wherein the catalyst comprises one or more than two combinations of hexyl benzene sulfonic acid, dodecyl sulfonic acid, pentadecyl sulfonic acid and dodecyl benzene sulfonic acid. Compared with a traditional concentrated sulfuric acid catalyst, the catalyst used in the application itself, especially after adding an additive, greatly reduces the corrosion of the catalyst to equipment, has good reusability and is more in line with the requirements of green chemistry.

The invention discloses transparent degradable copolyester as well as a preparation method and application thereof. The copolyester is prepared from terephthalic acid or dimethyl terephthalate, 1, 4-cyclohexanedimethanol, 1, 4-butanediol and lactic acid as raw materials through melt polymerization, the structure of the copolyester contains a fragment as shown in a formula I, the unit sequence length x is selected from 1-20, the unit sequence length y is selected from 1-20, and the unit sequence length z is selected from 4-6. A polylactic acid fragment is introduced into a terephthalic acid-butanediol polyester chain segment to adjust the biodegradability of the copolyester, and a 1, 4-cyclohexanedimethanol rigid dihydric alcohol structure is utilized to adjust the crystallization behavior of the degradable copolyester, so that the material is endowed with good transparency and biodegradability. The copolyester provided by the invention is transparent, has good mechanical properties and heat resistance, and is degradable in a full natural domain.

The application discloses a high-temperature-resistant thermoplastic polyester elastomer and a preparation method thereof, and relates to the technical field of polyester elastomers.The preparation method of the high-temperature-resistant thermoplastic polyester elastomer comprises the following steps: (1) mixing dimethyl terephthalate, 1,4-butanediol, an anti-aging reinforcing agent and polytetrahydrofuran ether glycol, introducing a protective gas, increasing temperature, adding a catalyst one, and performing a prepolymerization reaction; (2) adding a catalyst two, performing a vacuumization, increasing temperature, and continuously performing a polymerization reaction to obtain the high-temperature-resistant thermoplastic polyester elastomer.The high-temperature-resistant thermoplastic polyester elastomer prepared by the application has excellent tensile strength, elongation at break, anti-aging performance and high-temperature resistance.

The invention discloses a copolymerized polyester permanent flame-retardant fiber as well as a preparation method and application thereof, and belongs to the technical field of polyester fibers. The preparation method of the fiber comprises the following steps: firstly, reacting 2-amino-6-hydroxybenzothiazole with anacardol glycidyl ether to synthesize a modified comonomer containing a benzothiazole ring and a long fat side chain; then carrying out copolymerization reaction on the monomer, dimethyl terephthalate and ethylene glycol to prepare a flame-retardant polyester chip; and finally, performing melt spinning, stretching and heat setting to obtain the fiber. According to the invention, a flame-retardant structure is embedded into a main chain of a polyester molecule through chemical copolymerization, so that the durability of the flame-retardant property is realized. Wherein the benzothiazole ring can be catalyzed to form a compact expanded carbon layer, and molten drops are efficiently inhibited; and the cardanol side chain plays a role in intramolecular plastification, so that the flexibility and spinnability of the fiber are improved. The obtained fiber has the advantages of permanent flame retardance, molten drop resistance, high strength and good hand feeling.

The application provides a 2-amino terephthalic acid dimethyl ester 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 = 100.928 (2) °, beta = 98.038 (2) °, gamma = 106.164 (2) °, and a cell volume is 0. 734 0 (3) nm3. 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 161.80 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 all changed.

This invention discloses a method for preparing a bipolar membrane intermediate catalyst layer material, comprising the following steps: S1, mixing 2-aminoterephthalic acid, dimethyl terephthalate, and ferric chloride in a certain proportion, grinding them into particles with a diameter of 1-5 nm and ensuring thorough mixing to obtain a composite support powder; S2, placing the composite support powder in a container, adding N,N-dimethylformamide, and simultaneously adding transition metal oxides and graphene to obtain a raw material slurry; S3, introducing the raw material slurry into a reaction vessel, adding a catalytic medium, heating to 120-130℃ and a pressure of 0.8-1.5 MPa for thorough reaction, and cooling to room temperature; S4, washing and drying the reaction product, pressing it into a thin sheet to obtain the bipolar membrane intermediate catalyst layer material. This invention improves the catalytic site density of the bipolar membrane intermediate layer, enhances the bonding strength between the intermediate layer and the two adjacent anion and cation layers, and reduces ion migration resistance.

The invention discloses a nanoparticle modified antibacterial fabric and a preparation method thereof, and relates to the field of fabrics. When the nano particle modified antibacterial fabric is prepared, triethyl phosphite firstly reacts with 1-(1-bromoethyl)-3, 5-bis-trifluoromethyl-benzene, then is polymerized with dimethyl terephthalate, polyethylene glycol-2000, ethylene glycol and N-methyldiethanolamine, and finally reacts with 3-bromopropionyl chloride to prepare modified polyester; the preparation method comprises the following steps: reacting 5-amino-2-sulfydryl benzimidazole with nano graphene oxide to prepare modified graphene oxide; mixing the modified polyester, the modified graphene oxide and zinc acetate, and performing melt spinning, spinning and weaving to obtain the nano particle modified antibacterial fabric. The nano particle modified antibacterial fabric prepared by the invention has flame-retardant, durable and waterproof capabilities.

This invention discloses a method for purifying colored recycled DMT, belonging to the field of polyester recycling monomer purification technology. The method includes the following steps: dissolving colored recycled dimethyl terephthalate in an organic solvent to obtain a solution; adding a decolorizing adsorbent to the solution for adsorption and decolorization treatment, followed by filtration with the aid of a filter material to obtain a filtrate; removing the organic solvent from the filtrate, followed by washing with methanol to obtain a washed material; dissolving the washed material in methanol, performing heating dissolution, cooling crystallization, and washing to obtain a primary product; repeating the heating dissolution, cooling crystallization, and washing steps to obtain a crystalline product; and then performing vacuum distillation to obtain purified DMT. This invention not only achieves efficient decolorization and purification of colored recycled DMT but also avoids the high-energy-consumption and high-risk traditional distillation route.