241 results about "Cyclohexanedimethanol" patented technology

The invention provides a polyester-based composite functional master batch as well as a preparation method and application thereof. The polyester-based composite functional master batch is prepared from the following components in parts by weight: 54 to 100 parts of polyethylene glycol terephthalate-1, 4-cyclohexanedimethanol ester, 4 to 27 parts of a lubricating agent, 0.5 to 2 parts of a compatilizer, 0.5 to 10 parts of a light diffusion agent, 1 to 8 parts of a dispersing agent and 4 to 10 parts of tackifying resin. The polyester-based composite functional master batch provided by the invention is added in the process of processing and forming a polyethylene glycol terephthalate-1, 4-cyclohexanedimethanol ester-based light diffusion plate, so that the flowability and the demolding property can be improved, and the prepared product has excellent light transmittance and haze at the same time.

The invention discloses high-temperature-resistant and corrosion-resistant unsaturated polyester resin for a grid and a preparation method thereof, and belongs to the technical field of unsaturated polyester resin. The raw materials comprise the following components in parts by weight: 330 to 400 parts of isophthalic acid, 55 to 80 parts of 1, 4-cyclohexanedimethanol, 150 to 200 parts of ethylene glycol, 125 to 220 parts of first reaction stage propylene glycol, 0.2 to 0.6 part of a catalyst, 0.1 to 0.3 part of a first reaction stage antioxidant, 90 to 120 parts of second reaction stage propylene glycol, 30 to 50 parts of phthalic anhydride, 300 to 380 parts of maleic anhydride, 0.1 to 0.3 part of a second reaction stage antioxidant, 0.1 to 0.5 part of a polymerization inhibitor and 600 to 630 parts of a cross-linking agent. The high-temperature-resistant and corrosion-resistant unsaturated polyester resin for the grating has the characteristics of high corrosion resistance, high temperature resistance and high mechanical property, is low in cost and is suitable for being used as a raw material for manufacturing the grating.

The invention provides a method for catalytically converting waste PET (Polyethylene Terephthalate) plastic into 1, 4-cyclohexanedimethanol by a two-step method, which comprises the following steps of: 1, hydrogenating the waste PET plastic dispersed in methanol under the action of a nickel-based catalyst to obtain dimethyl 1, 4-cyclohexane dicarboxylate; and 2, centrifugally separating the catalyst and the reaction liquid in the step 1, and hydrogenating the reaction liquid under the action of a CuMgAl catalyst to obtain the target product 1, 4-cyclohexanedimethanol. The 1, 4-cyclohexanedimethanol is a key raw material for producing high-end polyester, and has very high market requirements. Under the optimal reaction condition, the molar yield of the 1, 4-cyclohexanedimethanol can reach 83.8%, and the separation purity reaches up to 99.5%. According to the method, upgrading and recycling of the PET waste are achieved so as to cope with the threat of white pollution to the ecological environment and human health.

The present invention provides a polyester heat-shrinkable film containing recycled materials and a preparation method thereof, belonging to the technical field of polymer synthetic films. The raw materials of the polyester heat-shrinkable film include recycled PET polyester particles, PET polyester chips, and a modified masterbatch; the modified masterbatch is prepared from polyethylene terephthalate-1,4-cyclohexanedimethanol ester, triphenyl phosphite, polyethylene glycol block copolymer, nano-silica, and hyperbranched polyester amine; the polyethylene glycol block copolymer is prepared from polyethylene glycol and γ-valerolactone under the action of a catalyst; the hyperbranched polyester amine is prepared from trimethylolpropane, methyl crotonate, and diethylenetriamine. The product of the present invention has excellent properties such as excellent unidirectional anti-shrinkage performance and low haze.

The invention relates to the technical field of multi-layer copolyester films, and discloses a high-temperature-resistant antistatic multi-layer copolyester film and a preparation method and application thereof, and the multi-layer copolyester film comprises an ABA three-layer structure obtained through melt co-extrusion; the layer A is prepared from the following raw materials in percentage by mass: 5 to 30 percent of anti-blocking agent master batch and the balance of modified copolyester; the raw material of the layer B is modified copolyester; the modified copolyester is prepared from a binary acid mixture, a dihydric alcohol mixture and a catalyst through an esterification reaction and a condensation polymerization reaction; the binary acid mixture comprises furandicarboxylic acid and 2, 2 '-bifuran-5, 5'-dicarboxylic acid, and the dihydric alcohol mixture comprises ethylene glycol, 2, 2, 4, 4-tetramethyl-1, 3-cyclobutanediol and 1, 4-cyclohexanedimethanol. According to the invention, the modified copolyester is used as a main raw material, and the film is endowed with good temperature resistance in a copolymerization modification manner, and has stable and lasting antistatic performance.

The invention discloses a dental plaque display type anti-caries invisible appliance based on synergism of iron-based nano-enzyme catalysis and traditional Chinese medicine caries inhibition, and belongs to the field of oral medical instruments. The preparation method of the appliance diaphragm comprises the following steps: preparing a composite material with the functions of catalytically degrading a bacterial biofilm matrix barrier and killing internal bacteria from polyethylene glycol terephthalate-1, 4-cyclohexanedimethanol (PETG) and a Fe3O4 nano-enzyme filler in a solution blending manner; and after the composite material is subjected to thermoplastic molding, a layer of molecularly imprinted polymer (MIP)-spiropyrane and chitosan-magnolol are coated with the fluorescent display agent which is prepared by mixing the molecularly imprinted polymer (MIP)-spiropyrane and the chitosan-magnolol. The iron-based nano-enzyme can catalytically degrade a bacterial biofilm matrix barrier and kill internal bacteria, and the MIP-spiropyrane fluorescent display agent can specifically display the accumulation condition of cariogenic bacterial plaque in the oral cavity under ultraviolet irradiation. The invisible orthodontic appliance can reduce or prevent caries while having the same orthodontic effect as other orthodontic appliances in the market.

The invention relates to the field of polyester, and discloses a method for continuously producing 1, 4-cyclohexanedimethanol by taking waste polyester as a raw material. Comprising the following steps: 1) mixing waste polyester with ethylene glycol, and performing alcoholysis under the action of an alcoholysis catalyst to obtain alcoholysis liquid containing diethylene glycol terephthalate; 2) performing primary hydrogenation on the alcoholysis solution under the catalysis of a hydrogenation catalyst A to obtain a reaction solution containing 1, 4-cyclohexane dioctyl phthalate diglycol ester; 3) performing secondary hydrogenation on the reaction liquid under the catalysis of a hydrogenation catalyst B to obtain a reaction liquid containing 1, 4-cyclohexanedimethanol; and 4) carrying out gas-liquid separation and rectification on the reaction liquid to obtain ethylene glycol and 1, 4-cyclohexanedimethanol. According to the method, the CHDM is produced by taking the waste polyester as the raw material, the method is simple in production process flow, and continuous production can be realized; through optimization of the catalyst and the process, high PET conversion rate, high CHDM selectivity, high CHDM yield and low production cost can be realized under relatively mild reaction conditions.

The invention relates to a catalyst for preparing 1, 4-cyclohexanedimethanol through hydrogenation of dimethyl 1, 4-cyclohexanedicarboxylate as well as a preparation method and application of the catalyst. The surface of the carrier CeO2 is modified by Zn-Zr alloy, so that the carrier has richer oxygen vacancies, the dispersity of active metal on the surface of the carrier can be improved, and the active metal shows higher performance. The prepared catalyst is applied to a 1, 4-dimethyl cyclohexanedicarboxylate hydrogenation reaction, and 1, 4-cyclohexanedimethanol with higher conversion rate, higher selectivity and higher trans-cis ratio can be obtained.

According to the PETG environment-friendly floor, the traditional PVC material is replaced with polyethylene terephthalate-1, 4-cyclohexanedimethanol, potential risks to human health and the environment are reduced, through the design of a multi-layer structure, the abrasion resistance, the decoration performance and the structural stability of the floor can be enhanced, and the service life of the floor is prolonged. The invention also provides a preparation method of the PETG environment-friendly floor. Through cooperation of the high-speed stirrer and the low-speed stirrer, preliminary mixing and plasticizing of raw materials are promoted, meanwhile, the raw materials are prevented from being over-plasticized, uniform mixing of the raw materials is ensured, the roller press is adopted, the wear-resistant layer and the decorative film layer are pre-attached while shading is pressed on the base material layer, then rapid forming and attaching and surface pattern decoration of the wear-resistant layer, the decorative film layer and the base material layer are achieved, and the production efficiency is improved.

The invention discloses a halogen-free flame-retardant regenerated PET material for steel coil packaging and a preparation method thereof, and belongs to the technical field of regenerated PET materials, and the halogen-free flame-retardant regenerated PET material for steel coil packaging is characterized by comprising the following raw materials in parts by weight: 100 parts of regenerated PET, 5-10 parts of POE-g-GMA, 4-8 parts of a flexibilizer, 1-3 parts of polyethylene glycol terephthalate, 1-3 parts of a flame retardant, 1-3 parts of an antioxidant, 1-3 parts of a lubricant, and 1-3 parts of a lubricant. The regenerated PET material is prepared from the following components in parts by weight: 15-20 parts of 1, 4-cyclohexanedimethanol ester, 3-7 parts of a flame retardant, 1-3 parts of a stabilizer and 0.3-0.5 part of an antioxidant, so that the effect of improving the impact resistance of the regenerated PET material is achieved.

The invention provides a method for preparing 1, 4-cyclohexanedimethanol by efficiently degrading PET (polyethylene terephthalate) waste plastics through a three-step method. In the method, the first step is that PET waste plastics are subjected to alcoholysis degradation to obtain dimethyl terephthalate, the second step is that the supported Ru-based catalyst catalyzes dimethyl terephthalate hydrogenation to prepare 1, 4-cyclohexanedicarboxylic acid dimethyl ester, and the third step is that the Cu-based catalyst catalyzes the 1, 4-cyclohexanedicarboxylic acid dimethyl ester to prepare the 1, 4-cyclohexanedimethanol. The catalyst is simple and convenient to prepare, low in cost and easy to recover, the product is easy to separate, the reaction process is green and environment-friendly, and conditions are mild. According to the technical scheme, the novel method for preparing the important polyester monomer 1, 4-cyclohexanedimethanol through efficient catalysis of the PET waste plastics is provided, waste is turned into wealth, and the method has excellent application prospects.

The invention relates to a catalyst for preparing 1, 4-cyclohexanedimethanol (CHDM) by catalyzing dimethyl terephthalate (DMT) hydrogenation and a preparation method thereof, non-noble metals nickel (Ni) and copper (Cu) are used as active components, silicon dioxide is used as a carrier, ammonia water in a solution is evaporated out after ammonia water precipitation, and a catalyst sample is obtained. The active components mainly adopt metal Ni and Cu elements with relatively low price, compared with noble metals such as ruthenium, rhodium, platinum and the like, the use cost of the catalyst is greatly reduced, the bimetallic catalyst Ni-Cu-SiO2 is prepared by an ammonia distillation method, 1, 4-cyclohexanedimethanol can be prepared by catalyzing dimethyl terephthalate hydrogenation by a one-pot method, and the catalyst has a wide application prospect. The preparation cost of the catalyst is relatively low, the dispersity and stability of the catalyst are improved by adopting an ammonia distillation method, the CHDM is prepared by adopting a one-pot method, the energy consumption is further reduced, the reaction procedure is simplified, and the preparation method is simple and is easy to amplify to industrial production.

The invention discloses a crystallinity low-melting-point polyester fiber and a preparation method thereof, and relates to the technical field of polyester fibers, the crystallinity low-melting-point polyester fiber is composed of a skin layer and a core layer, and a skin-core integrated crystallization design is adopted; the skin layer is modified copolyester, and the core layer is modified PET; the modified copolyester is prepared from the following raw materials in parts by weight: 38 to 42 parts of terephthalic acid, 12 to 15 parts of 2, 5-furandicarboxylic acid, 28 to 32 parts of 1, 4-cyclohexanedimethanol, 8 to 10 parts of polycaprolactone, 1.0 to 1.5 parts of a crystallization coordinating agent, 0.5 to 1.0 part of an antioxidant and 0.3 to 0.5 part of a hindered amine light stabilizer. The crystallization coordinating agent is prepared by compounding hydroxylated graphene and maleic anhydride grafted polyolefin elastomer according to a mass ratio of (2 to 3): 1. The fiber is good in high temperature resistance and durability, low in melting point, good in size stability and long in service life.

The invention relates to the technical field of electrochemistry, in particular to a polymer composite film, a composite current collector and a preparation method thereof, a positive electrode and application thereof. The polymer composite film comprises a polymer base layer, and a first modified layer and a second modified layer which are respectively arranged on two opposite side surfaces of the polymer base layer, the material of the polymer base layer comprises one or more of polyethylene glycol terephthalate, poly (1, 4-cyclohexylenedimethylene terephthalate) and polyethylene glycol terephthalate-1, 4-cyclohexylenedimethylene terephthalate; the first modified layer and the second modified layer respectively and independently comprise the following components: a functional polymer material; the functional polymer material comprises one or more of polyethylene naphthalate, polyadipyl metaphenylene diamine, a liquid crystal polymer, polyformaldehyde, polyphenylene sulfide and polyphenyl ether. The polymer composite membrane disclosed by the invention can be effectively broken when being damaged by relatively strong external force, so that thermal runaway of the battery can be effectively prevented.

The invention discloses a method for preparing 1,4-cyclohexanedimethanol from waste polyester as raw material, the method first hydrogenates the benzene ring under the catalytic action of a loaded noble metal catalyst to obtain an intermediate product poly-1,4-cyclohexanedicarboxylic acid dibasic ester, the product of the first stage hydrogenation reaction is not separated and purified, and the second stage hydrogenation is directly carried out, and under the action of a copper-based catalyst, the ester group is reduced to an alcohol group to generate 1,4-cyclohexanedimethanol. The two-stage hydrogenation process uses the same reaction solvent and can be recycled, the waste polyester conversion rate reaches 100%, and the 1,4-cyclohexanedimethanol yield is up to 98%. The method has the characteristics of short process, few by-products, no intermediate product refining process and low energy consumption, can form a circulating process loop, and is suitable for large-scale production of 1,4-cyclohexanedimethanol.

The invention discloses a low-temperature high-shrinkage PETG shrink film, which adopts a three-layer co-extrusion structure, and comprises a surface layer, a core layer and a bottom layer, the core layer is prepared from a PETG shrink film functional master batch accounting for 90-95 wt% of the total mass and PETG for a common film, and the PETG shrink film functional master batch is prepared from the following raw materials in parts by weight: 100-120 parts of terephthalic acid, 100-120 parts of 1, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, 100-120 parts of 1, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, 100-120 parts of 1, 2, 4-trimethyl-1, 3-pentanediol The invention relates to a high-temperature-resistant polyurethane adhesive which is prepared from the following components in parts by weight: 30 to 50 parts of 1, 4-cyclohexanedimethanol, 80 to 100 parts of ethylene glycol, 0.1 to 0.2 part of triaryl phosphate, 0.01 to 0.03 part of isocyanate, 0.01 to 0.02 part of potassium tripolyphosphate, 0.1 to 0.2 part of magnesium aluminum silicate, 0.2 to 0.4 part of disodium ethylene diamine tetraacetate and 0.3 to 0.5 part of other auxiliaries. The invention also discloses a preparation method of the shrink film. The transverse thermal shrinkage rate of the PETG shrink film with a three-layer structure prepared by taking the functional master batch as a core layer is greater than 70% at 80 DEG C, and when the PETG shrink film is used as a label of an outer package of a product, the PETG shrink film has relatively good shrink packaging performance on special-shaped bottles, common PP bottles and the like, and the packaging bottles are not easy to damage and deform.

The invention relates to the technical field of catalysis, and discloses a combined catalyst and application thereof in preparation of 1, 4-cyclohexanedimethanol. The catalyst A and the cocatalyst in the combined catalyst have high reaction selectivity in the process of catalytically oxidizing paraxylene (PX) to prepare terephthalyl alcohol, so that the conversion rate of the PX and the yield of the terephthalyl alcohol are relatively high, and an oxidation product can be directly hydrogenated to prepare 1, 4-cyclohexanedimethanol without separation and purification; meanwhile, the hydrogenation catalytic performance of the catalyst B is excellent; under the combination, paraxylene can be directly converted into 1, 4-cyclohexanedimethanol through a one-step oxidation reaction and a one-step hydrogenation reaction, the technological process can be greatly shortened, and the catalyst is easy to separate and recover after reaction.

The invention relates to the technical field of thermoplastic plastics, in particular to modified PCTG polyester and a preparation method and application thereof, and the modified PCTG polyester is formed by copolymerization of terephthalic acid, isophthalic acid, 1, 4-cyclohexanedimethanol, diethylene glycol, neopentyl glycol and 2, 2, 4, 4-tetramethyl-1, 3-cyclobutanediol. The problems that existing PCTG is insufficient in temperature resistance, transparency, mechanical property and chemical corrosion resistance can be solved.

The invention discloses transparent resin as well as a preparation method and application thereof, and belongs to the technical field of polyester synthesis and application and development of polyester materials. The preparation method comprises the following steps: sequentially carrying out esterification reaction and polycondensation reaction on a mixture containing dibasic acid, dihydric alcohol, a catalyst and a stabilizer to obtain transparent resin; the binary acid is selected from at least one of terephthalic acid, 2, 5-furandicarboxylic acid and 2, 5-thiophenedicarboxylic acid; the dihydric alcohol is selected from at least two of ethylene glycol, 1, 4-butanediol, 1, 4-cyclohexanedimethanol, isosorbide and 2, 2, 4, 4-tetramethyl-1, 3-cyclobutanediol, and the dihydric alcohol is selected from at least two of ethylene glycol, 1, 4-butanediol, 1, 4-cyclohexanedimethanol, isosorbide and 2, 2, 4, 4-tetramethyl-1, 3-cyclobutanediol; the catalyst is selected from defect-state nano titanium dioxide; and the stabilizer is selected from triphenyl phosphate. By using the combination of the defect-state nano titanium dioxide catalyst and the triphenyl phosphate stabilizer, the polymerization reaction can be completed with high activity and low time consumption, and meanwhile, good transparency, excellent color, low ash content and excellent thermodynamic property of the product are kept.

The invention relates to the technical field of powder coatings, and provides a high-temperature-resistant powder coating and a preparation method thereof. The high-temperature-resistant powder coating is prepared from the following raw material components in parts by mass: 18 to 22 parts of vinyl silicone resin, 12 to 22 parts of novolac epoxy resin, 1 to 6 parts of 1, 4-cyclohexanedimethanol glycidyl ether, 12 to 14 parts of acrylic resin, 50 to 60 parts of filler and 2 to 3 parts of curing agent, the mass content of vinyl in the vinyl silicon resin is 1.29%-1.33%. According to the technical scheme, the problem of poor high-temperature resistance of the powder coating in the related technology is solved.

The invention discloses a deep embossing polyester facing film, a preparation method thereof and a polyester film facing plate. The polyester facing film is prepared from the following raw materials in percentage by weight: 10 to 20 percent of flame-retardant polyester and the balance of poly (1, 4-cyclohexanedimethanol terephthalate); the flame-retardant polyester is prepared by condensation polymerization of a first esterification product and a second esterification product in a mass ratio of (60-70): (20-30), the raw materials of the first esterification product comprise terephthalic acid and 1, 4-cyclohexanedimethanol in a molar ratio of 1: (1.05-1.3), and the raw materials of the second esterification product comprise a benzoxazine phosphate monomer and dihydric alcohol in a molar ratio of 1: (1.1-1.3). The benzoxazine phosphate chain segment is introduced into the PCT, so that the flame retardant property of the polyester facing film is remarkably improved on the basis of not keeping the mechanical property and the processability of the polyester material.

The present disclosure relates to a polyester film and a preparation method of the same. Since the polyester film includes a resin layer formed from a mixture comprising a polyester resin, which includes a first diol moiety derived from isosorbide and a second diol moiety derived from cyclohexanedimethanol in a controlled ratio, and polyethylene terephthalate in a specific ratio, it is possible to exhibit improved heat resistance and adhesion with excellent light transmittance.

The present invention relates to the field of coating preparation. Disclosed are a low-temperature curing thin-coat powder coating and a preparation method therefor. The powder coating comprises a resin, an accelerant, a curing agent, a dispersing agent, benzoin, barium sulfate, a leveling agent, a brightening agent, and a pigment as preparation raw materials, and the preparation raw materials of the resin comprise neopentyl glycol, ethylene glycol, 1,4-cyclohexanedimethanol, terephthalic acid, adipic acid, isophthalic acid, a catalyst, and an antioxidant. In the present application, by optimizing the preparation raw materials of the resin and the preparation raw material proportion, the branching degree and the terminal carboxyl activity of the resin are effectively improved, the reaction activity of the resin is ensured, the curing temperature of the powder coating is reduced, and excellent weather resistance and mechanical properties can also be obtained; moreover, the catalyst and the antioxidant are added in the resin preparation stage, thereby facilitating improvement of the storage stability, solving, taken as a whole, the problem of non-uniform dispersion of powder coatings, and facilitating improvement of the glossiness of the coating and the performance of the coating.

The present invention provides a polyester wherein: a dicarboxylic acid constituent unit includes 72.5 mol% or more of a constituent unit derived from 2,6-naphthalenedicarboxylic acid and / or an ester derivative thereof among a total 100 mol% of said dicarboxylic acid constituent units; and a diol constituent unit includes 27.5 mol% or more of a constituent unit derived from 1,4-cyclohexanedimethanol and a constituent unit derived from 2,2,4,4-tetramethyl-1,3-cyclobutanediol among a total 100 mol% of said diol constituent units. A feeding bottle according to the present invention is formed using said polyester.

The invention discloses a high-temperature-resistant liquid crystal polymer substrate for ultrathin flexible display, which belongs to the technical field of flexible display and comprises a modified liquid crystal polymer and a functional additive dispersed in the modified liquid crystal polymer. The modified liquid crystal polymer is prepared by polymerizing a monomer composition, and is specifically prepared from 38 to 42 parts of p-hydroxybenzoic acid, 28 to 30 parts of 4, 4 '-biphenol, 5.6 to 6.0 parts of terephthalic acid, 4.4 to 5.0 parts of 2, 6-naphthalic acid, 2.7 to 3.3 parts of isophthalic acid, 9 to 11 parts of 2, 2-bis (3, 5-difluoro-4-hydroxyphenyl) hexafluoropropane, 4.5 to 5.5 parts of N, N'-dihydroxypyromellitic diamine, 9 to 11 parts of 9, 9-bis [4-(4-methoxycarbonyl phenoxy) phenyl] fluorene and 1, 2-bis (4-(4-methoxycarbonyl phenoxy) phenyl] fluorene. The component A is prepared from 5.5 to 6.5 parts of 1, 4-cyclohexanedimethanol; the functional additive comprises an azobenzene derivative, a hot acid generator and a hydrogen bond enhancer; through the synergistic effect of a specific monomer combination, a functional additive and an optimization process, the technical bottleneck that heat resistance, transparency, dimensional stability and flexibility of an existing material are difficult to consider at the same time is broken through.

The invention provides a 3D printing supporting material as well as a preparation method and application thereof. The 3D printing supporting material is prepared from an ethylene-vinyl alcohol copolymer, polyethylene glycol terephthalate-1, 4-cyclohexanedimethanol ester, polyolefin elastomer grafted maleic anhydride, glass fibers and a filling material in specific parts. Through reasonable matching of the components in a specific dosage, the 3D printing supporting material can adapt to different types of printing base materials, has an excellent supporting effect and relatively low water absorption rate, can be easily stripped from a part body, and is very suitable for being used as a supporting material of an FDM printer.

The invention discloses a composite material and a preparation method thereof, and relates to the technical field of building materials. The preparation method comprises the following steps: providing a first mixed solution and 1, 3-cyclohexanedimethanol, mixing, and carrying out a first reaction to obtain a first prepolymer solution; providing a second mixed solution and polytetramethylene ether glycol, mixing, and carrying out a second reaction to obtain a second prepolymer solution; the first mixed solution and the second mixed solution both comprise diphenylmethane diisocyanate; providing a third mixed solution, mixing the third mixed solution with the first prepolymer solution and the second prepolymer solution, and carrying out a third reaction to obtain a supramolecular polymer; the third mixed solution comprises a chain extender; providing a wear-resistant agent, an antioxidant and glass fibers, and mixing with the supramolecular polymer to obtain the composite material. The composite material obtained by the method provided by the invention has high strength, excellent impact toughness, high wear resistance and self-repairing capability, and has wide prospects in high-end application scenarios such as polyurethane doors and windows, curtain wall keels, photovoltaic brackets and the like.

The present invention relates to a biodegradable superabsorbent polymer and its preparation method, belonging to the technical field of polymer materials. First, polyol I and terpene acid undergo a ring-opening polymerization reaction to generate an oligomer with carboxyl side chains. Then, the oligomer with carboxyl side chains and polyol II undergo a polycondensation cross-linking reaction to obtain a degradable cross-linked polymer. Finally, the degradable cross-linked polymer reacts with sodium salt to prepare the biodegradable superabsorbent polymer. Polyol I is ethylene glycol, propylene glycol, butylene glycol, hexanediol, octanediol, isosorbide, isomannide, isoidide, IIDML, IMDML, ISDML, 1,4-cyclohexanedimethanol or furan dimethanol. Polyol II is glycerol, triethanolamine, 1,2,4-butanetriol, pentaerythritol or erythritol. The chemical structural formula of the product is or, and the number-average molecular weight is 10000-80000 g / mol. The method of the present invention has a simple process; the product has both superabsorbent ability and excellent biodegradability.

The invention provides a high-valued utilization method and device for residual liquid in a rectifying tower in the production process of 1, 4-cyclohexanedimethanol, and relates to the technical field of by-product purification, and the method comprises the following steps: adding residual liquid in a CHDM rectifying tower, a catalyst and methanol into a methanol alcoholysis tank for alcoholysis reaction; introducing the alcoholysis solution into a scraper evaporator for distillation separation, and conveying a product into a gas-liquid separation tank to obtain an alcoholysis concentrated solution; and introducing the alcoholysis concentrated solution into an alcoholysis solution recovery tower for vacuum rectification, and condensing to obtain a crude product CHDM. According to the method, a methanol alcoholysis process is innovatively adopted, the CHDM rectifying tower kettle residual liquid is efficiently converted into high-value products such as CHDM, MHMCC and DMCD, and the products can be directly recycled to an existing CHDM rectifying system; through a designed methanol and tower kettle residual liquid recycling system, efficient utilization of raw materials and emission reduction of wastes are realized; a high-efficiency catalyst is adopted, so that conversion can be realized under mild conditions; and the catalyst can be used together with a device, and can be directly connected to the existing CHDM rectification device without modifying the original device.

The present invention relates to the field of organic synthesis, and in particular to a system and method for polyester recycling co-producing bis(2-hydroxyethyl) terephthalate and 1,4-cyclohexanedimethanol. The system, in the direction of feed, sequentially comprises a polyester alcoholysis system, a solid filtration system, a solvent recovery system, and a diethyl terephthalate purification system, as well as a bis(2-hydroxyethyl) terephthalate preparation system and a 1,4-cyclohexanedimethanol preparation system, each connected to the diethyl terephthalate purification system. The present invention, by optimizing the process route for polyester recycling co-producing bis(2-hydroxyethyl) terephthalate and 1,4-cyclohexanedimethanol, first degrades a polyester into an intermediate product diethyl terephthalate, and then prepares bis(2-hydroxyethyl) terephthalate and 1,4-cyclohexanedimethanol from the diethyl terephthalate. In this way, two degradation products can be obtained simultaneously, especially addressing the current issue of the high production cost of 1,4-cyclohexanedimethanol, reducing the cost of polyester recycling, and making it more suitable for industrial application.