1220 results about "Esterification reaction" patented technology

A boron-containing polyethylene glycol fatty acid ester surfactant belongs to the field of organic chemistry and functional materials. The boron-containing polyethylene glycol fatty acid ester surfactant is prepared as follows: polyethylene glycol (PEG), boric acid and fatty acid are used as raw materials, first esterification reaction of the PEG and the boric acid is performed, then esterification reaction of the PEG and the fatty acid is performed to obtain boron-containing poly ethylene glycol fatty acid ester; by changing the species of fatty acids and catalysts and molecular weight of the PEG, the esterification rate can be enhanced, the boron-containing poly ethylene glycol fatty acid ester product can be used as a surfactant, and the boron-containing poly ethylene glycol fatty acid ester can reduce water surface tension and has good emulsifying properties.

The invention provides a polyester polyol production method, a polyester polyol production device and application, according to the polyester polyol production method, single-stage gas-liquid separation in the prior art is improved, and at least two-stage series gas-liquid separation is carried out in the esterification reaction process, so that the total production time is shortened, the production efficiency is improved, and the production cost is reduced. By-products such as polyether can be effectively removed, and the product quality stability of the polyester polyol can be effectively improved.

The invention provides a glyceryl triacetate production parameter control method and system based on reinforcement learning, and relates to the technical field of optimization control methods, and the method comprises the steps: obtaining the production parameters of glyceryl triacetate; based on the kinetic model, constructing a kinetic equation of the esterification reaction of glycerol and acetic acid; constructing a digital twinborn simulation environment of the glyceryl triacetate production process; defining a reinforcement learning framework by taking a digital twin simulation environment as a scene; according to the reinforcement learning framework, taking the Elman neural network as a state predictor, and predicting the state of the glyceryl triacetate; solving the reinforcement learning framework through an MO-MPO algorithm, and determining an optimal control strategy and an optimal production parameter sequence corresponding to the optimal control strategy; judging whether the process capability index is smaller than a process capability index threshold value or not; if yes, continuing to solve the reinforcement learning framework; otherwise, outputting an optimal production parameter sequence; and controlling the optimal production parameter sequence through a PID (Proportion Integration Differentiation) control algorithm.

The present invention relates to the field of polyurethane materials and particularly to a temperature-induced color-changing vehicle film and a preparation method therefor. The method of the present invention comprises: firstly, using polyurethane to wrap vanadium dioxide powder to obtain color-changing microcapsules; then using 1,1,1,3,5,5,5-heptamethyltrisiloxane and 3-allyloxy-1,2-propanediol as raw materials to synthesize an organosilicon-modified diol, and enabling trimellitic anhydride to react with toluene diisocyanate to synthesize a dicarboximide compound; enabling the organosilicon-modified diol and the dicarboximide compound to undergo an esterification reaction and a polymerization reaction to obtain an organosilicon-modified imide polyester diol; then mixing the organosilicon-modified imide polyester diol with polytetrahydrofuran ether glycol 2000, and then enabling the mixture to react with toluene diisocyanate to obtain a polyurethane elastomer; and mixing the polyurethane elastomer, the color-changing microcapsules, a silane coupling agent, a plasticizer, an antioxidant, and an ultraviolet light absorber, followed by melt extrusion and blow molding into a film, so as to obtain the temperature-induced color-changing vehicle film.

The invention relates to a continuous production method of high-purity tetraethoxysilane, and belongs to the technical field of tetraethoxysilane preparation. The method comprises a raw material pretreatment stage and a purification and rectification stage: in the pretreatment stage, silicon tetrachloride and ethanol are subjected to an esterification reaction in a molar ratio of 1: (3-4) under the protection of nitrogen, the pH is adjusted to be neutral through triethylamine, and triethylamine hydrochloride is removed through reduced pressure distillation; then, a cerium oxide-molecular sieve composite adsorbent with the specific surface area larger than or equal to 800 m / g and the pore diameter of 2-5 nm is adopted for dehydration under the pressure of 0.8-1.2 MPa till the water content is smaller than or equal to 5 ppm, and volatile impurities are removed through high-purity nitrogen purging; in the purification stage, metal ions and Cl are synergistically removed through a titanate modified resin layer and a nano TiOtube layer, and then step-by-step separation is performed through a four-stage differential pressure rectifying tower. Through collaborative optimization of structural design of the composite adsorbent, construction of an organic-inorganic hybrid interface of the resin layer and pressure gradient rectification, 72-hour continuous production is achieved, the single-pass yield of the product is 92%, and the total amount of metal impurities is smaller than or equal to 5 ppb.

The invention provides a semi-crystalline transparent multicomponent copolyester and a preparation method thereof, and relates to the technical field of polyester synthesis. The preparation method of the semi-crystalline high-transparency multicomponent copolyester comprises the following steps: esterification reaction: mixing terephthalic acid, ethylene glycol, a branching agent, a modified monomer and a main catalyst, and carrying out esterification reaction to obtain an esterification product; and condensation polymerization: mixing the esterification product with a main catalyst, and carrying out condensation polymerization to obtain the semi-crystalline high-transparency multi-component copolyester, the mixture of the esterification reaction and / or the condensation polymerization reaction comprises a cocatalyst. According to the preparation method disclosed by the invention, polyester is subjected to copolymerization modification with relatively low content of alcohol and / or acid modified monomers to obtain the semi-crystalline multicomponent copolyester, and the semi-crystalline multicomponent copolyester is endowed with the advantages of high transparency, high hue, low cost, easiness in processing and the like.

The invention discloses diglyceride prepared by an enzymic method as well as a preparation method and application thereof, and belongs to the technical field of deep processing of grease. The method comprises the following steps: adding fatty acid into a choline chloride-glycerol-urea ternary eutectic solvent, uniformly mixing, and then adding candida antarctica lipase B for esterification reaction to obtain a reaction mixture; separating the reaction mixture, and recovering an upper-layer oil phase; and separating and purifying the upper-layer oil phase to obtain the diglyceride. According to the method, the reaction rate is high, the selectivity of the diglyceride in the esterification process is high, the yield of the diglyceride can reach 65% or above by reacting for 1 h, the selectivity of the diglyceride is 75% or above, and the purity of the separated and purified diglyceride is 90% or above; in addition, the method is simple to operate, and the reaction product and the eutectic solvent can be separated through simple centrifugation after the reaction is finished; in addition, the monoglyceride content in the product is low, and the subsequent separation and purification difficulty is greatly reduced.

The synthesis method comprises the following steps: S1, adding furandicarboxylic acid into a reaction container, adding a certain amount of methanol, adding a double-acid-site strong acid solid catalyst, starting stirring, controlling the reaction temperature to carry out esterification reaction, and after the reaction is finished, filtering, washing and drying to obtain furandihydrazide; separating out the double-acid-site strong acid solid catalyst to obtain clear liquid, namely dimethyl furandicarboxylate; s2, transferring dimethyl furandicarboxylate serving as a raw material into another reaction container, adding a certain amount of sodium formate serving as a catalyst, then adding a proper amount of hydrazine hydrate, controlling the reaction temperature, keeping a reflux state, reacting for a period of time, cooling to room temperature after the reaction is finished, and performing centrifugal separation to obtain white solid furandihydrazide. The synthesis method has the advantages of simple reaction steps, no need of toxic and harmful catalysts, mild reaction conditions, high conversion rate and high yield, and can realize efficient, green and low-cost production of furandihydrazide.

The invention discloses a peracetylated polysaccharide derivative mixing accelerator as well as a preparation method and application thereof, and relates to the technical field of polysaccharide derivatives. Alkyl polyglucoside and glycidyl ether are subjected to etherification reaction to obtain polysaccharide derivatives; and adding acetic anhydride and an organic weak base catalyst into the polysaccharide derivative, and carrying out esterification reaction to obtain the peracetylated polysaccharide derivative. The obtained peracetylated polysaccharide derivative can be used for reducing the minimum miscible pressure of CO2 in an offshore oilfield. The polysaccharide derivative provided by the invention is simple in synthesis process, and the molecular activity of the polysaccharide derivative can be regulated and controlled by changing the number of carbon dioxide-philic groups and the length of oleophylic unsaturated hydrocarbon chains, so that the polysaccharide derivative can be used in the CO2 oil displacement process of oilfield exploitation, and the minimum miscible pressure in the CO2 oil displacement process is effectively reduced.

The invention relates to the technical field of rice bran processing, and discloses a rice bran degreasing and nutrition retention edible process synergistic treatment method which comprises the following steps: (a) in an NADES-aqueous solution medium, adding an immobilized catalyst A, and hydrolyzing ferulate bonds and phospholipids in rice bran at low temperature; (b) carrying out intermediate dehydration on the slurry obtained in the step (a) to reduce the water activity; (c) adding an immobilized catalyst B into the dehydrated slurry in the step (b), carrying out esterification reaction, and grafting free ferulic acid generated by hydrolysis to glyceride in situ; and (d) carrying out solid-liquid separation on the slurry obtained in the step (c) to obtain finished oil and finished powder. According to the method, an NADES medium is adopted to replace an organic solvent, the whole process is carried out at low temperature, degradation of heat-sensitive nutrient substances is avoided, and resource utilization of ferulic acid is achieved. The prepared functional rice bran oil is rich in feruloyl glyceride, total tocopherol and oryzanol, and is low in acid value and peroxide value.

The invention relates to a method for preparing high-molecular-weight polyethylene furandicarboxylate by a one-step method, and belongs to the technical field of bio-based polyester materials. The method comprises the following steps: weighing raw materials including 2, 5-furandicarboxylic acid, ethylene glycol, an end group regulator, a protective agent, a decarboxylation inhibitor and a catalyst, mixing and adding into a reaction container, introducing nitrogen, maintaining the pressure of the nitrogen in the reaction container to be 50-150 kPa, carrying out esterification reaction, heating and vacuumizing until the pressure is less than or equal to 50 Pa after the esterification reaction is completed, and carrying out polycondensation reaction to obtain the 2, 5-furandicarboxylic acid. And carrying out extrusion and drying so as to obtain the high-molecular-weight polyethylene furandicarboxylate, wherein the high-molecular-weight polyethylene furandicarboxylate is obtained. According to the method, the FDCA conversion rate is larger than or equal to 98%, the number-average molecular weight of the obtained product is larger than or equal to 32 kg / mol, no heavy metal residues exist, and the method is suitable for large-scale production of high-end bio-based packaging materials.

The invention belongs to the technical field of organic synthesis, and provides a preparation method of a cationic lipid compound, which comprises the following steps: (1) reacting 1, 5-dihalopentane, 2-tert-butyl glycolate and alkali to obtain a product G; (2) hydrolyzing the product G under an acidic condition to obtain a product H; (3) carrying out esterification reaction on the product H, the raw material C, 4-dimethylaminopyridine and a condensing agent in dichloromethane to obtain a product J; and (4) carrying out amination reaction on the product J, the raw material L and alkali in acetonitrile to obtain the cationic lipid compound. Compared with the prior art, the method has the relatively remarkable advantages that when the first part of halogenated long-chain alkyl ester H is synthesized by the method, 1, 5-dihalopentane and 2-tert-butyl glycolate are used as raw materials, the halogenated long-chain alkyl ester J is synthesized by a simple method, the product is obtained at a higher yield in synthesis, and the method is suitable for kilogram-level production. The route synthesis only comprises four steps of chemical reactions, and is suitable for industrial production.

The present application relates to a kind of powder coating hydroxyalkylamide matting curing agent and its preparation method, the matting curing agent using including citric acid, 2-methyl-1,3-propanediol, dimethylbenzene, anhydrous methanol, N-methyl monoethanolamine, catalyst, nanometer titanium dioxide is reacted to obtain raw materials.In first, citric acid and 2-methyl-1,3-propanediol are grafted to carry out reaction, then the remaining four carboxyl groups of grafting are methyl esterification reaction, obtain methyl esterification product, then with N-methyl monoethanolamine acylation reaction obtains hydroxyalkylamide curing agent;Add nanometer titanium dioxide, fully mix and process to obtain the matting curing agent.The curing agent product functionality is higher, the hardness of coating film after curing is higher, and the boiling water resistance is excellent;And the coating film after curing has obvious matting effect, coating film gloss is basically reached 50-70%, and the decorative property is excellent.

The invention discloses a bio-based recoverable high-thermal-conductivity dynamic ordered network composite material and a preparation method thereof, and is characterized in that the material takes a bio-based multifunctional epoxy system and a carboxylic acid compound containing disulfide bonds as reaction monomers, and the reaction monomers are reacted under the conditions of high temperature and metal salt catalyzed epoxy-carboxylic acid esterification reaction to obtain the bio-based recoverable high-thermal-conductivity dynamic ordered network composite material. A dynamic ordered network structure simultaneously containing disulfide bonds and beta-hydroxyl ester bonds is constructed, and the dynamic ordered network can be used as a springboard for phonon transmission, serves as an efficient'thermal bridge ', and plays a role similar to an ordered'crystal domain', so that higher heat-conducting property is shown when heat-conducting filler is not introduced, high flexibility and intrinsic heat conduction are realized, and the service life of the material is prolonged. And the material is endowed with reprocessing and recycling characteristics. Due to the synergistic existence of carboxyl, hydroxyl generated by epoxy ring opening and metal coordination in the system, and in combination with electrostatic interaction, Van der Waals force and hydrophobic interaction, the material has the adhesion characteristic suitable for a thermal interface at the same time.

The invention discloses an environment-friendly automobile decoration material containing a bio-based material and a preparation method of the environment-friendly automobile decoration material, belongs to the technical field of preparation of environment-friendly materials, and aims at solving the technical problem that the environment-friendly performance and flame-retardant performance of a decoration material in the prior art need to be further improved. The flame-retardant polyurethane material specifically comprises the following components in parts by weight: 40-60 parts of mixed polyol, 15-25 parts of flame-retardant cellulose, 35-45 parts of isocyanate and 10-15 parts of an auxiliary additive. According to the preparation method, biomass-containing mixed polyol is prepared through esterification reaction, modified cellulose is prepared through acid treatment, alkali treatment and esterification reaction, the modified cellulose is combined with the modified cellulose through covalent bonds, flame-retardant cellulose is obtained, the environment-friendly performance and flame-retardant performance of the decorative material are improved, and the mechanical strength of the decorative material is also improved.

The invention relates to the technical field of surfactants, and particularly discloses a preparation method and application of a sulfosuccinate type surfactant, and the preparation method specifically comprises the following steps: (1) esterification reaction: under the protection of inert gas, adding fatty alcohol and carboxylic acid anhydride, introducing gas for 10-20 minutes, adding a difunctional acidic site catalyst, heating to 95-105 DEG C, and reacting for 2-3 hours to obtain an esterification product; and (2) sulfonation reaction: cooling the esterification product to 70-80 DEG C, dropwise adding 20-40wt% of sulfonating agent aqueous solution, preserving heat for 1-2 hours after dropwise adding, and then performing post-treatment to obtain the sulfosuccinate type surfactant. In the preparation process, one-pot preparation is realized by regulating and controlling process conditions and developing a catalyst to efficiently catalyze esterification and sulfonation, intermediate products do not need to be separated between esterification and sulfonation, material loss caused by transfer and separation is avoided, the adopted catalyst can be used for inhibiting premature oxidation of a sulfur source in the sulfonation process, and the sulfonation efficiency is improved. The generation of byproducts is reduced, and the yield is improved.

The invention is suitable for the technical field of multifunctional textile materials, and provides a wave-absorbing type flame-retardant electromagnetic shielding fabric and a preparation method and application thereof.The wave-absorbing type flame-retardant electromagnetic shielding fabric takes aramid fiber / stainless steel blended fabric as a base material, and the surface of the base material is coated with a functional coating; the functional coating is composed of a waterborne polyurethane matrix, a NiZnFe2O4 and MnO2 / GA composite wave absorbing agent dispersed in the waterborne polyurethane matrix, an ammonium polyphosphate flame retardant and a catalyst p-toluenesulfonic acid; under the catalysis of p-toluenesulfonic acid, carrying out esterification reaction on ammonium polyphosphate, the waterborne polyurethane matrix and oxygen-containing functional groups in the graphene aerogel to form a phosphorus-oxygen-carbon covalent cross-linked network; the invention successfully solves the technical problem of collaborative integration of wave-absorbing and flame-retardant properties, has the characteristics of light weight, flexibility, environmental friendliness and the like, and is suitable for the field of high-end flexible electromagnetic protection and fireproof safety.

The invention discloses a conjugated polymer photocatalyst, a preparation method thereof and application of the conjugated polymer photocatalyst in photocatalytic synthesis of nitric acid, and belongs to the technical field of polymer materials and photocatalysis. The preparation method of the catalyst mainly comprises the following steps: synthesizing an intermediate 2CzTPN-Br through a nucleophilic substitution reaction, then synthesizing an intermediate TBBA through an esterification reaction, and finally copolymerizing the intermediate 2CzTPN-Br and the intermediate TBBA through a coupling polymerization reaction to obtain the target catalyst. The preparation method disclosed by the invention is controllable in process, and the obtained catalyst does not need to participate in noble metal and has wide light absorption, high specific surface area and excellent carrier separation efficiency; when being applied to photocatalytic synthesis of nitric acid, nitrogen in air can be directly and efficiently converted into nitric acid under the mild conditions of room temperature, air atmosphere and water serving as a solvent, excellent durability is shown, the yield of nitric acid can reach 4466.2 mol g <-1 > cat after 324-hour continuous illumination, and wide application prospects are achieved in the field of green synthesis.

The invention provides an environment-friendly water-based pressure-sensitive adhesive as well as a synthesis method and application thereof. The environment-friendly water-based pressure-sensitive adhesive comprises a dehydroabietic acid-based acrylate derivative grafted acrylate emulsion and a rosin emulsion, wherein the acrylate emulsion is prepared from an acrylate monomer, a dehydroabietic acid-based acrylate derivative monomer, an emulsifier, an initiator and water through an emulsion polymerization reaction. The dehydroabietic acid-based acrylate derivative monomer is prepared from a rosin derivative dehydroabietic acid and a hydroxyl acrylate monomer through an esterification reaction; according to the environment-friendly water-based pressure-sensitive adhesive, the synthesis method and the application thereof, the comprehensive performance of the acrylate pressure-sensitive adhesive is improved, the environment-friendly water-based acrylate pressure-sensitive adhesive is developed, the rosin derivative is added as a synthesis or compounding raw material, dependence on fossil raw materials is reduced, and meanwhile, the environment-friendly water-based acrylate pressure-sensitive adhesive is prepared. The comprehensive performance such as initial adhesion and peel strength of the pressure-sensitive adhesive is remarkably improved, and the whole production and use process is free of VOC emission and environmentally friendly.

The invention discloses a high-stability functional beverage based on citric acid and maltodextrin dynamic cross-linked microencapsulated spirulina and a preparation method of the high-stability functional beverage, and belongs to the technical field of functional food processing. Aiming at the problems of flavor defect, easy degradation of active ingredients, poor storage stability, narrow system adaptability and the like of the existing spirulina beverage, the invention initiates a citric acid and maltodextrin dynamic crosslinking wall material system, constructs a core-shell structure microcapsule, and combines a synergistic process of spray drying, gradient homogenization, staged sterilization and the like to prepare the spirulina beverage. The efficient embedding and function maintenance of the spirulina in various beverage substrates are realized. A dense ester bond network is formed on the basis of dynamic esterification reaction of maltodextrin hydroxyl and citric acid carboxyl, a cross-linking degree detection method is optimized, and nonlinear improvement of a synergistic technical effect is realized. The process is stable and controllable, the microcapsule embedding rate is high, the method is suitable for multiple systems such as yoghourt, fruit juice and vegetable protein beverages, and the method can be widely applied to the field of functional foods and has remarkable industrialization value.

The invention discloses a preparation method of high-temperature transformer oil, and belongs to the technical field of high-temperature transformer oil. Comprising the following steps: 1, carrying out hydrolysis reaction to obtain ricinoleic acid; step 2, carrying out first esterification reaction to obtain a ricinoleic acid esterification product; 3, performing epoxidation reaction to obtain an epoxidized ricinoleic acid esterification product; 4, carrying out ring-opening reaction to obtain ring-opened castor oil; 5, carrying out a second esterification reaction to obtain modified castor oil base oil; and 6, mixing the modified castor oil base oil, a viscosity index improver, an antioxidant, a demulsifying agent and an extreme pressure agent to obtain the high-temperature transformer oil. The invention provides modified castor oil and a preparation method thereof. The high-temperature antioxidant transformer oil prepared by using the modified castor oil as base oil has the characteristics of environmental protection, degradability, high flash point, high breakdown voltage and the like, and also has excellent oxidation stability.

The application provides a starch-indole acid derivative and a preparation method and application thereof, and relates to the technical field of modified starches. The starch-indole acid derivative refers to esterified starch generated by esterification reaction of starch, a condensing agent and alkali and indole acid. The starch-indole acid derivative has high resistance and can resist degradation of the stomach and small intestine. After reaching the colon site, the starch-indole acid derivative can be fermented by intestinal flora to release indole acid beneficial to intestinal health. Compared with traditional drug delivery modes such as intragastric administration and intraperitoneal injection, the starch-indole acid derivative has obvious advantages and can significantly increase the content of indole acid in the colon and hepatic portal vein blood. In addition, indole acid can activate an aromatic hydrocarbon receptor to play an immunoregulatory role. The immunoregulatory role of indole acid is superimposed on the regulation role of short-chain fatty acids released by starch fermentation by intestinal flora, so that a product playing an immunoregulatory role through multiple immune system signal pathways is provided.

The invention belongs to the technical field of high polymer material preparation, and provides a low-melting-point toughened copolyester chip and a preparation method thereof. The preparation method comprises the following steps: firstly, preparing hyperbranched polyester of which the surface is rich in carboxyl-terminated functional groups through core growth of polybasic acid alcohol and end group functionalization reaction of anhydride; the other chain extender is a linear chain extender which has a long flexible chain segment and two tail ends of which are also functionalized by carboxyl groups, and is obtained by carrying out end group esterification reaction on polyether glycol; then, in the synthesis process of the main polyester, carrying out multi-stage melt polycondensation on an aromatic dibasic acid component and a polyol component under the action of a composite catalyst system, introducing the hyperbranched polyester and a chain extender into a reaction system in the form of slurry, and covalently bonding a functional additive to a copolyester main chain through a polycondensation process, so as to obtain the hyperbranched polyester. An integrated network reinforced structure is formed, so that the copolyester chip has the characteristics of low melting point and excellent toughness.

The invention relates to the technical field of automobile essence preparation, and particularly discloses automobile essence capable of removing formaldehyde and releasing anions and a preparation method of the automobile essence. Comprising the following raw materials in parts by weight: 500-600 parts of deionized water, 18-24 parts of a negative ion release enhancing component, 12-20 parts of an aldehyde removing component, 30-40 parts of absolute ethyl alcohol, 8-14 parts of a dispersing agent, 14-18 parts of phenoxyethanol, 22-26 parts of an initiator solution and 6-10 parts of citral. A negative ion release enhancing component and a formaldehyde removal component are added, the negative ion release enhancing component is prepared by modifying core-shell particles with a silane coupling agent, the outer layer of each core-shell particle is of a porous titanium dioxide structure, the inner core of each core-shell particle is modified electrical powder, and the formaldehyde removal component is prepared by carrying out a ring-opening esterification reaction on sodium alginate and allyl glycidyl ether, so that the formaldehyde removal effect is improved. And then carrying out chemical cross-linking with hydroxypropyl acrylate and methacrylic acid, thereby coordinating and enhancing the formaldehyde removal capability, the anion release capability and the antibacterial effect.

This invention discloses a cellulose acetate-based 1,8-naphthalenedimide fluorescent probe for detecting hydrazine, its preparation method, and its application. The invention uses 4-bromo-1,8-naphthalenedimide as a raw material, which undergoes a condensation reaction with 4-aminobutyric acid to obtain 4-(4-bromo-1,8-naphthalenedimide)butyric acid (BNA-B); BNA-B undergoes a coupling reaction with 4-formylphenylboronic acid to obtain 4-(4-(4-formylphenyl)-1,8-naphthalenedimide)butyric acid (FNA-B); compound FNA-B then undergoes an esterification reaction with cellulose acetate (CA) to obtain the cellulose acetate-based 1,8-naphthalenedimide fluorescent probe FNA-B-CA. This compound specifically recognizes hydrazine. Under 365 nm ultraviolet light irradiation, the addition of hydrazine to a DMF / H2O solution of FNA-B-CA changes the fluorescence color of the solution from bright blue to colorless, indicating a detection limit of 8.4 × 10⁻⁶ for hydrazine. ‑8 M has promising applications as a fluorescent probe for the detection of hydrazine.

The invention discloses a post-treatment method of cellulose acetate butyrate. The post-treatment method comprises the following steps: 1) adding polyethylene glycol and a sodium bicarbonate aqueous solution into a to-be-precipitated solution containing cellulose acetate butyrate to obtain a to-be-precipitated mixed solution; 2) dissolving the to-be-precipitated mixed solution in an aqueous solution of low-carbon alcohol for precipitation to obtain a precipitation solution; and 3) carrying out solid-liquid separation on the precipitation liquid to obtain solid particles, and washing and drying to obtain the cellulose acetate butyrate. The method provided by the invention can replace the existing production route of precipitating esterification liquid with pure water and washing CAB products with pure water, can effectively avoid solid particle aggregation, is easy to wash and remove butyric acid, can also prevent alcohol and butyric acid from esterification reaction, and is especially suitable for industrial production of CAB with high purity and narrow particle size distribution.

The invention belongs to the technical field of fine chemical engineering, and discloses a synthesis method of a malonate compound, which comprises the following steps: under the action of a heterogeneous catalyst, carrying out hydrolysis-esterification reaction on cyanoacetic acid and alcohol, and after the reaction is finished, carrying out post-treatment to obtain the malonate compound, the heterogeneous catalyst comprises a carrier and an active component; the active component comprises ionic liquid and active metal; the carrier is an ordered mesoporous material; the active metal is alkaline earth metal. According to the method, malonate products can be obtained, the problems of low yield, serious equipment corrosion and large amount of three wastes are solved, efficient synthesis of malonate compounds is realized, meanwhile, the production efficiency is improved, and the environmental pollution is greatly reduced.

This invention relates to the field of yarn technology, specifically disclosing a superconducting wet-drying yarn, its preparation method, and its application. The yarn is prepared by blending high-shrinkage polyester fibers and cotton fibers. The preparation of the high-shrinkage polyester fibers includes two parts: raw material synthesis and fiber forming. Terephthalic acid and ethylene glycol are used as raw materials. After the esterification reaction, polyethylene glycol and aromatic dicarboxylic acid ester sulfonate are added, resulting in high-shrinkage polyester chips. These chips are then used as raw materials for spinning to obtain high-shrinkage polyester fibers. Through the two-component design of the yarn, a micro-circulation diffusion system with superconducting moisture absorption and sweat-wicking effect is formed, effectively improving the hygroscopicity of the polyester fibers. Even after multiple washes, it still possesses excellent superconducting wet-drying properties, long-lasting efficacy, and good wash resistance, without causing uneven dyeing or unidirectional moisture wicking problems.

The invention provides isosorbide-based copolyester as well as a preparation method and application thereof, and relates to the technical field of high polymer materials. According to the preparation method, a step-by-step esterification method is adopted, firstly, isosorbide, excessive aromatic dicarboxylic acid and an acylating agent are subjected to a first esterification reaction, so that the acylating agent can efficiently and specifically activate secondary hydroxyl of isosorbide, and the initial esterification rate of isosorbide is greatly increased. Meanwhile, the excessive aromatic dicarboxylic acid ensures that the generated isosorbide prepolymer takes carboxyl as a terminal group, so that isosorbide molecules are'locked 'in the middle of a polymer chain segment. Due to the fact that the isosorbide is embedded in the middle of the chain segment in advance, the problem that the isosorbide falls off in the ester exchange reaction due to the fact that the isosorbide is located at the chain end and low in reaction activity in the subsequent polycondensation stage is effectively solved, and therefore the retention rate of the isosorbide in the final polymer is greatly increased, and the glass-transition temperature of the isosorbide is greatly increased.

The invention discloses a puncture-resistant packaging film and a preparation method thereof. The packaging film comprises a polyamide layer; the polyamide layer is prepared from the following raw materials in parts by mass: 70 to 90 parts of polyamide, 20 to 30 parts of modified polyamide and 5 to 10 parts of modified filler; the modified polyamide is prepared by the method comprising the following steps: carrying out condensation polymerization on a mixed monomer containing diamine, dibasic acid and polybasic acid to obtain a polyamide prepolymer; wherein the molar weight of the polybasic acid accounts for 5-10% of the total mole number of the dibasic acid and the polybasic acid; the preparation method comprises the following steps: carrying out melt esterification reaction on a polyamide prepolymer and polyester diol in a mass ratio of (10-25): (75-90) in the presence of a catalyst, and reacting a terminal hydroxyl group of the polyester diol with a carboxyl group of the polyamide prepolymer to obtain the modified polyamide. The problems that the polyamide material is high in rigidity and poor in puncture resistance can be effectively solved.