330 results about "Transesterification" patented technology

The utility model discloses a polyester reverse esterification kettle on-line adding device which comprises a first esterification kettle and a second esterification kettle, a batching pipeline is arranged between the first esterification kettle and the second esterification kettle, and a three-monomer on-line injection system is arranged on one side of the batching pipeline. A second static mixer, a dynamic mixer and a pneumatic valve are sequentially arranged on the batching pipeline between the three-monomer on-line injection system and the second esterification kettle, and materials prepared by the three-monomer preparation system are injected into a connecting pipeline through the three-monomer on-line injection system; and then the mixture enters the second static mixer and the dynamic mixer to be mixed and then is injected into the second esterification kettle through the pneumatic valve. The transformation from production of extinction products to production of cationic products can be quickly realized in the five-kettle process, so that the productivity and the quality of the products are ensured, and benefits are created for enterprises to be maximized.

The invention relates to the field of chemical synthesis, in particular to a production process of allyl diethylene glycol dicarbonate, which comprises the following steps: by taking allyl alcohol and dimethyl carbonate as raw materials, carrying out transesterification under the action of a core-shell catalyst to generate dipropylene carbonate; carrying out solid-liquid separation, carrying out reduced pressure distillation to recover methanol and dimethyl carbonate, and then carrying out second-step ester exchange reaction with diethylene glycol under the action of the same catalyst to generate allyl diethylene glycol dicarbonate; and finally, performing multi-stage reduced pressure distillation purification to obtain a high-purity product. According to the core-shell type catalyst, an MCM-41 molecular sieve is used as a carrier, an inner core is formed after amino modification and zirconium ion coordination, then an interface layer and a phenyl modified silicon dioxide shell are used for packaging, and the core-shell type catalyst has high activity, high selectivity and excellent structural stability. The method has the advantages of mild process conditions, recyclable catalyst, high product yield and excellent purity, and is suitable for industrial production.

The invention belongs to the technical field of copolymerization modification of degradable polyester, and relates to a depolymerization method and application of polybutylene terephthalate. During depolymerization, polybutylene terephthalate, dimethyl carbonate and dihydric alcohol are mixed and then subjected to a depolymerization reaction, and an intermediate ester is prepared; the dihydric alcohol is dihydric alcohol which does not form a ring with dimethyl carbonate in the depolymerization reaction process; the molar weight of the dimethyl carbonate is 10-30% of the molar weight of a repetitive unit of the polybutylene terephthalate; the sum of the molar weight of a 1, 4-butanediol unit in the polybutylene terephthalate and the molar weight of the added dihydric alcohol is a, the sum of the molar weight of a terephthalic acid unit in the polybutylene terephthalate and the molar weight of the added dimethyl carbonate is b, and the ratio of b to a is (1.2-1.5): 1; during application, the prepared intermediate ester is subjected to transesterification under the condition of negative pressure to obtain the copolyester. The depolymerization method is simple and easy to implement; the depolymerization product can be directly applied.

The invention belongs to the technical field of polymer composite materials, and particularly relates to a polycarbonate modified composite material as well as a preparation method and application thereof, and the polycarbonate modified composite material comprises 60-85 parts of a PC base material, 10-30 parts of a bio-based monomer, 1-8 parts of surface modified nano cellulose and 0.1-2 parts of a transesterification catalyst. According to the polycarbonate modified composite material as well as the preparation method and the application thereof provided by the invention, chemical bonding of a bio-based monomer and a PC main chain is realized through transesterification, phase separation is avoided, and the core pain point of traditional blending modification is solved; the biodegradation rate is increased by 30% or above compared with pure PC, and meanwhile, the excellent mechanical properties (the tensile strength is larger than or equal to 60 MPa, and the notch impact strength is larger than or equal to 5 kJ / m) of PC are reserved; the melt flow rate is increased by more than 25%, the processing energy consumption is reduced, and the application scene is widened; the carboxylic acid modified nano cellulose and the block copolymer form a synergistic network, so that the mechanical property, the thermal stability and the degradation uniformity are synchronously improved.

According to the method, industrial-grade 1, 2-propylene glycol co-produced by a dimethyl carbonate process through a transesterification method is taken as a raw material, and purification processes of activated carbon adsorption impurity removal, deodorant impurity removal and rectification impurity removal are carried out, so that various indexes such as chromaticity, odor, purity and ultraviolet light transmittance of the obtained 1, 2-propylene glycol product reach the quality indexes of an imported pharmaceutical-grade 1, 2-propylene glycol product. According to the method disclosed by the invention, the pharmaceutical grade propylene glycol can be prepared with high quality, and a good development prospect and huge economic benefits are undoubtedly brought to the propylene glycol industry.

The application provides a hindered amine light stabilizer and a preparation method thereof, and the preparation method comprises the following steps: putting N, N-bis(2, 2, 6, 6-tetramethyl-4-piperidyl) 1, 6-hexanediamine and an organic solvent into a reaction bottle, heating to 50-80 DEG C, adding methyl acrylate into the system dropwise, obtaining an intermediate I through an addition reaction, and then obtaining a crude product through an ester exchange reaction of the intermediate I and tetramethylpiperidinol in the presence of a catalyst and an organic solvent, washing with water, decoloring, filtering, cooling and crystallizing, filtering and drying to obtain the product; the light stabilizer obtained by the application has multiple hindered amine functional groups, has good heat resistance and extraction resistance, and has good compatibility with resin.

The invention provides a preparation method of dicapryl carbonate, belongs to the field of preparation of dicapryl carbonate, and can solve the problems of unstable reaction system, low raw material conversion rate, low catalyst efficiency, poor phase contact effect, many side reactions, low product purity and poor quality in the existing preparation method of dicapryl carbonate. The preparation method of dicapryl carbonate comprises the following steps: fully mixing n-caprylic alcohol, a basic catalyst and a cosolvent, continuously dropwise adding low-grade dialkyl carbonate into the mixed solution for 5-10 hours through a liquid material distributor, carrying out ester exchange reaction, continuously extracting low-boiling-point substances, controlling the reflux quantity, and carrying out reduced pressure distillation to obtain the dicapryl carbonate. The method comprises the following steps: adding a cosolvent into a reaction solution, enabling the cosolvent with an initial addition amount to always exist in the reaction solution, after the reaction is finished, dealcoholizing by reduced pressure distillation, and removing impurities by washing to obtain a crude product of dioctyl carbonate, and rectifying to obtain a dioctyl carbonate product. The preparation method is high in raw material conversion rate and high in product yield, and the purity of the obtained product is gt; the content of impurities is low, and the method can be applied to preparation of cosmetics.

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 molecular sieve catalyst for synthesizing methyl ethyl carbonate by a transesterification method and a regeneration method, and relates to the technical field of molecular sieve catalysts, the molecular sieve catalyst comprises a microporous double-active-center inner core and an amphoteric mesoporous shell; the microporous double-active-center core takes the X-type zeolite as a carrier to load potassium, cesium, lanthanum and barium; the amphoteric mesoporous shell is an MCM-41 and SBA-15 composite mesoporous silica layer coating the outer part of the inner core and has a double-mesoporous structure, amino propyl triethoxy silane and carboxyethyl triethoxy silane are grafted on the surface of the amphoteric mesoporous shell, and zirconium and titanium are co-doped. According to the invention, collaborative optimization of active centers and mass transfer channels is realized through a core-shell structure of a microporous double-active-center core and an amphoteric mesoporous shell. The activity and selectivity of catalytic transesterification are remarkably improved by the microporous core; due to the double-mesoporous structure and surface functional modification of the amphoteric mesoporous shell, the mass transfer efficiency of reactants and products is improved, and the adaptability of the catalyst to a reaction system is enhanced.

The invention relates to the technical field of catalysis, and particularly discloses a method for preparing pure biodiesel from kitchen waste oil through enzyme catalytic desulfurization. The method comprises the following steps: adding a Sm2O3 / ZrO2 solid acid catalyst into the kitchen waste oil for pretreatment to obtain pretreated waste oil, and then adding lipase into the pretreated waste oil for catalyzing transesterification to obtain the biodiesel. According to the method for preparing the pure biodiesel from the kitchen waste oil through enzyme catalytic desulfurization, in-situ esterification and synchronous desulfurization of free fatty acid can be completed in a single-step reaction, the stability of a conversion reaction is effectively improved, the production process is simplified, and the conversion efficiency of preparing the biodiesel from the kitchen waste oil is improved.

The invention discloses transparent copolyester, a preparation method thereof and a product prepared from the copolyester. The preparation method comprises the following steps: carrying out esterification or ester exchange reaction on dibasic acid or dimethyl ester of the dibasic acid and dihydric alcohol at 5-300kPaG to obtain an esterified substance or an ester exchange substance; then, the normal pressure of the system is recovered, the esterification or ester exchange temperature is kept unchanged, the negative pressure of the ester or ester exchange material is gradually reduced to high vacuum according to a certain pressure reduction rate, excessive monomers are removed, the content of impurities generated by the ester or ester exchange material is 0.3 wt% or below, and a prepolymer is obtained; and further heating the prepolymer, and carrying out final polycondensation reaction under high vacuum to obtain the target copolyester. The method can effectively weaken the side reaction in the synthesis process, improve the hue of the copolyester product, improve the light transmittance, reduce the haze and improve the heat resistance. Products prepared from the copolyester, such as bottle materials, sheets, plates and membrane materials, have the characteristics of light color, high transparency and good heat resistance.

The invention discloses composite ester-based hydraulic oil and a preparation method thereof, and belongs to the technical field of hydraulic oil preparation. The hydraulic oil based on the complex ester comprises the following components: pentaerythritol synthetic ester, polysebacic acid glycol ester, a viscosity-temperature performance regulator, an ash-free antioxidant, a bio-based anti-wear agent and a nano modifier. Wherein the pentaerythritol synthetic ester is a mixed ester obtained by carrying out a reaction on a mixture of 2-ethylhexanoic acid, 3, 5-dimethylhexanoic acid and 4-methyloctanoic acid and pentaerythritol, and the pentaerythritol synthetic ester is a mixture of 2-ethylhexanoic acid, 3, 5-dimethylhexanoic acid and 4-methyloctanoic acid; the viscosity-temperature performance regulator is a grafted copolymer obtained by grafting poly (N-isopropylacrylamide) to a poly (ethylene sebacate) molecular chain through an ester exchange reaction. The product prepared by the method disclosed by the invention can effectively solve the contradiction between the environmental protection performance and the comprehensive performance of the traditional hydraulic oil through the synergistic effect of the components, has the characteristics of high biodegradation rate and good oxidation resistance and hydrolytic stability, and can keep excellent performance in both low-temperature and high-temperature environments.

The preparation method comprises the following steps: S1, hydrophilic-hydrophobic bi-component modification reaction: dissolving a styrene-maleic anhydride copolymer, hydrophilic polyethylene glycol monomethyl ether and hydrophobic long-chain alkyl alcohol in butanone according to a ratio, adding a catalyst, stirring, reacting, filtering, washing, and drying to obtain the dispersing agent for the lithium battery diaphragm based on the modified benzyl resin micelle. Performing ester exchange reaction on anhydride bonds of the styrene-maleic anhydride copolymer and polyether hydroxyl and alkyl alcohol hydroxyl respectively to obtain a modified intermediate; s2, neutralization reaction: dropwise adding organic alkali into the modified intermediate, and adjusting the pH value to obtain a modified SMA solution containing carboxylate groups; s3, preparing nano-micelles: dropwise adding the modified SMA solution into deionized water, and stirring to enable the modified SMA solution to be self-assembled to form the nano-micelles, so as to obtain nano-micelle dispersion liquid; and S4, dispersing agent forming: stirring the nano-micelle dispersion liquid to remove butanone so as to obtain the water-based dispersing agent.

The invention discloses a degradable epoxy resin insulating material for electrical equipment as well as a preparation method and application of the degradable epoxy resin insulating material, and relates to the technical field of functional polymer materials. The degradable epoxy insulating material is prepared from an epoxy monomer, a transesterification catalyst N-methyldiethanolamine and an anhydride curing agent. Compared with a material prepared by a traditional method, the material has more excellent insulating property and mechanical property, the breakdown strength can reach up to 48.2 kV / mm, the dielectric loss is as low as 0.00116, the tensile strength reaches up to 93.5 Mpa, and the thermal stability is equivalent to that of traditional epoxy resin. Meanwhile, the epoxy resin disclosed by the invention can realize hot-pressing remolding recovery and chemical degradation recovery under mild conditions by virtue of a dynamic ester exchange reaction, and the performance retention rate gt of the physically regenerated resin is gt; the performance retention rate of the chemically regenerated resin is gt; 87%. According to the invention, a high-performance and sustainable new scheme can be provided for an electrical equipment insulating material.

The invention belongs to the field of photovoltaic technology, and provides a photovoltaic packaging adhesive film, a preparation method and application thereof, and a recovery method of a photovoltaic module. The photovoltaic packaging adhesive film comprises the following raw materials in specific amounts: matrix resin, a low-temperature cross-linking agent, a low-temperature catalyst, a silane coupling agent, an ultraviolet light stabilizer, an organic peroxide initiator, an assistant cross-linking agent and an alcohol compound serving as a reversible dynamic transesterification reaction group, the matrix resin is EVA (ethylene vinyl acetate), POE (polyolefin elastomer) and / or ethylene-butylene copolymer; the low-temperature cross-linking agent is a carboxylic ester type cross-linking agent, a bisoxazoline type cross-linking agent and / or a metal-organic ligand cross-linking agent with the reaction temperature of 150 DEG C or below; the low-temperature catalyst is a polynuclear metal catalyst, a solid acid resin catalyst, a solid base catalyst and / or a bimetallic MOF derivative catalyst with the reaction temperature of 150 DEG C or below. The adhesive film can realize recycling of the adhesive film and a photovoltaic module in a more efficient and energy-saving manner, is wide in adaptability, and has high crosslinking degree, peel strength and PID resistance.

The invention belongs to the technical field of organic synthesis, and particularly relates to a process for catalytically synthesizing ascorbyl tetraisopalmitate by a biological enzyme. The synthesis process comprises the following steps: attaching a biological enzyme to a metal organic framework compound material (MOFs material) to prepare biological enzyme catalyst powder, and adding a small amount of biological enzyme catalyst powder into methyl n-hexylcaprate and ascorbic acid which are used as raw materials for transesterification to prepare ascorbyl tetraisopalmitate. The process route is simple, few three wastes are generated, compared with a traditional preparation process of tetra-isopalm ascorbate, the yield and purity of the product are greatly improved, and experimental results show that the highest yield of the product is 89%, and the purity of the product reaches 99.0%.

The invention provides ammonolysis modified diester oil for TPE (thermoplastic elastomer) and a preparation method of the ammonolysis modified diester oil. The ammonolysis modified diester oil comprises the following components in parts by weight: 100-120 parts of modified disubstituted diester oil; 20 to 50 parts of an ammonolysis agent; 0.1 to 0.3 part of a catalyst; wherein the modified disubstituted diester oil is obtained by carrying out ester exchange reaction on diester oil and aromatic alcohol. The modified disubstituted diester oil is obtained through ester exchange reaction of diester oil and aromatic alcohol, and two non-polar benzene ring structures are introduced into a molecular chain of the modified disubstituted diester oil, so that the compatibility of the modified disubstituted diester oil and SBS / SEBS is effectively improved, and the modified diester oil can be directly used for producing and processing TPE materials. An ammonolysis agent is added for ammonolysis reaction, so that the modified diester oil obtains amido bonds with high light and heat stability and hydrolysis resistance, and the aging resistance of the TPE material applying the diester oil can be effectively improved.

The invention belongs to the technical field of fine chemical engineering, and particularly relates to a method for preparing L-aminopropanol by splitting DL-aminopropanol. The resolution method comprises the following steps: (1) preparing immobilized CALB lipase; (2) preparing a bimetallic catalyst; (3) performing transesterification with vinyl acetate under the action of a bimetallic catalyst and the immobilized CALB lipase; and (4) carrying out alkaline hydrolysis reaction with sodium hydroxide, and then carrying out post-treatment to obtain the L-aminopropanol. According to the method for preparing the L-aminopropanol by splitting the DL-aminopropanol, all the steps have a synergistic effect, and it is ensured that the prepared L-aminopropanol has the high yield and purity.

This invention discloses a method for preparing high-quality bio-based 1,9-nonanediol, comprising the following steps: transesterification, precipitation, fatty acid methyl ester refining, ozone oxidation pyrolysis, solvent recovery, esterification, dimethyl azelaate refining, and hydrogenation to obtain high-quality bio-based 1,9-nonanediol. This invention achieves gradient and full-component utilization of vegetable oil raw materials: the oil-based portion of triglycerides is used to produce high-quality bio-based 1,9-nonanediol, while simultaneously producing byproducts such as methyl palmitate, methyl stearate, propionic acid, hexanoic acid, and nonanoic acid; the glycerol-based portion of triglycerides is used as a byproduct of glycerol production. This invention utilizes esterification to reconstruct the products of ozone oxidation pyrolysis, converting the high-boiling-point monomethyl azelaate into the low-boiling-point dimethyl azelaate, achieving efficient separation from saturated fatty acid methyl esters. The dimethyl azelaate, as a raw material, is then hydrogenated to obtain high-quality nonanediol, significantly reducing production costs.

The present application provides a kind of waste oil transesterification reaction catalytic system, belong to biomass refining field.The preparation steps of catalyst include: in the solution containing Ni (NO3) 2 And Fe (NO3) 3 Carboxymethyl cellulose is added, then urea is added, reaction is carried out, and nano-porous NiFe2O4 is obtained, MgCl2 / ZnCl2 Solution and KOH / K2CO3 Solution are added to NiFe2O4 water dispersion, reaction is carried out, solid product is collected, calcination is carried out, and catalyst is obtained.Catalyst is added to waste oil to carry out catalytic reaction.The present application adopts carboxymethyl cellulose to regulate the crystal form, grain size and dispersity of catalyst carrier, and the obtained solid magnetic catalyst can improve the production efficiency of waste oil for preparing biodiesel.The catalyst has high active site, fast reaction rate, mild reaction condition, can reduce reaction energy consumption and production cost.The catalyst also has good magnetic property, is convenient for recovery.The catalyst has good stability, improves the controllability and stability of reaction.

The present invention relates to a bismuth-containing catalyst of formula (R1)2-(R2)-(Bi)3+ (I), wherein (R1)2- is a dianion of formula (II*), wherein A is unsubstituted or at least monosubstituted linear C3-30-alkylene, wherein at least two not adjacent CH2 groups of C3-30-alkylene are replaced by a heteroatom independently selected from the group consisting of O, S, 5 NH, N-C1-30-alkyl, N-C6-14-aryl and N-C7-30-aralkyl, wherein alkyl and aryl fragments of N-C1-30-alkyl, N-C6-14-aryl, N-C7-30-aralkyl may at least be monosubstituted by hydroxyl, halogen, -CF3, NH2, -NH-C1-6-alkyl, -NH- phenyl, -N(C1-6-alkyl)2, -N(phenyl)2, -SH, -S-C1-6-alkyl, -S-phenyl, -O-C1-6-alkyl or -O-phenyl, to process for the preparation of the bismuth containing catalyst, to a process for the preparation of a compound, oligomer or polymer comprising at least one urethane group using the bismuth-containing catalyst, to a composition comprising (i) at least one monoalcohol (B1) or polyol (B2), (ii) at least one polyisocyanate (A) and (iii) the bismuth-containing catalyst, to a coating or adhesive layer formed from the composition on a substrate, to a foam formed from the composition, and to the use of the bismuth-containing catalyst in for preparing compounds, oligomers or polymers comprising a urethane group, as esterification and transesterification catalyst and as catalyst for ring-opening polymerizations of lactones and epoxides.

This invention discloses a potassium nepheline precursor and its dispersion, a potassium nepheline catalyst, its preparation method, and its applications. The potassium nepheline precursor of this invention has an amino-containing silane coupling agent grafted onto its surface. The potassium nepheline precursor dispersion of this invention comprises a potassium nepheline precursor and a dispersion medium, wherein the average diameter of the potassium nepheline precursor in the dispersion is 5–20 nm. The potassium nepheline catalyst prepared using the potassium nepheline precursor dispersion of this invention exhibits high activity and good stability when used in transesterification reactions to produce biodiesel.

The invention belongs to the technical field of polymer materials, and particularly relates to a polyaromatic-carbonic acid-aliphatic copolyester production method which comprises the following steps: mixing aromatic dibasic acid and aliphatic dihydric alcohol, feeding into a first esterification kettle, and adding an esterification catalyst for esterification reaction to obtain an esterification product; uniformly mixing aliphatic dihydric alcohol, feeding the mixture into a second esterification kettle, adding diester carbonate and a transesterification catalyst into the second esterification kettle, reacting to obtain a transesterification product, and feeding the transesterification product into a demonomerisation kettle to obtain a demonomerisation product; mixing the esterification product and the demonomerisation product with a polycondensation catalyst and a stabilizer, shearing and homogenizing, feeding into a pre-polycondensation kettle for reaction to obtain a pre-polycondensation product, feeding the pre-polycondensation product into a final polycondensation kettle for reaction to obtain a copolymer, and performing water-cooling granulation to obtain a copolyester product. According to the production method provided by the invention, the final polycondensation time can be shortened, and the weight-average molecular weight and the mechanical strength of the prepared copolyester are improved.

This polyester resin composition contains a polybutylene terephthalate resin, a recycled polyethylene terephthalate resin, a transesterification inhibitor, a carbodiimide compound, and an elastomer. The amount of terminal hydroxyl groups in the polybutylene terephthalate resin is 30-70 mmol / kg relative to the total amount of the polybutylene terephthalate resin and the recycled polyethylene terephthalate resin. The amount of the carbodiimide compound is 0.2-1.5 mass% relative to the total amount of the polyester resin composition. The amount of the elastomer is 3-15 mass% relative to the total amount of the polyester resin composition.

The invention discloses a preparation method of heat-resistant bisphenol A type copolycarbonate, and belongs to the technical field of polycarbonate synthesis. Comprising the following steps: by taking bisphenol A and diester carbonate as monomers, aromatic dibasic acid, aromatic dibasic acid ester or aromatic dihydroxy compound as a copolymerization unit and imidazole ionic liquid as a catalyst, carrying out transesterification under a protective atmosphere, and then carrying out condensation polymerization under a vacuum condition to obtain the heat-resistant bisphenol A type copolycarbonate. A metal-free catalyst is used for carrying out melt polycondensation on bisphenol A type copolycarbonate, so that efficient polymerization and heat-resistant modification of polycarbonate are realized. The performance of the copolycarbonate is regulated and controlled by controlling the type and proportion of the added copolymerization units, so that the glass-transition temperature is increased while the mechanical properties and optical properties of the bisphenol A polycarbonate are retained.

The present application relates to the field of beta-hydroxy fatty acid ester polymer preparation, further to a kind of beta-hydroxy fatty acid ester polymer and the method for preparing the polymer.The structural formula of the polymer is as shown in formula 1:Wherein, R1 is H or C1-C12 alkyl, R2 is C1-C6 alkyl;The weight average molecular weight of the polymer is 8000-200000;The number average molecular weight of the polymer is 5000-180000;Polydispersity index is 1-2.5.The beta-hydroxy fatty acid ester polymer of the present application has higher molecular weight, narrower molecular weight distribution, has the performance of corresponding biofermentation synthesis beta-hydroxy fatty acid ester polymer, and does not contain the impurity that bio-synthesis beta-hydroxy fatty acid ester polymer is difficult to remove, has higher application value.The preparation method of the present application, reaction condition is relatively mild, process is simple, and has higher process safety.

The invention relates to a preparation method of 3-ethoxy isoamyl propionate, and belongs to the technical field of organic solvent synthesis. The preparation method of the 3-ethoxy isoamyl propionate comprises the following steps: S1, adding ethanol, a polymerization inhibitor and a catalyst A into a reaction kettle, heating to 40-55 DEG C, then dropwise adding ethyl acrylate, preserving heat, and carrying out addition reaction for 1-3 hours to obtain a reaction mixture; s2, adding an acidic material for neutralization, and carrying out vacuum rectification to obtain ethyl 3-ethoxypropionate; s3, adding ethyl 3-ethoxypropionate and a catalyst B into a reaction kettle, heating to 100-120 DEG C, introducing isoamyl alcohol, controlling the reaction temperature to 100-115 DEG C, and carrying out transesterification for 2.5-4 hours to obtain a crude product; and S4, cooling to stop the reaction, separating to remove the catalyst B, and carrying out reduced pressure rectification on the obtained crude product to obtain the 3-ethoxypropionic acid isoamyl ester. The method has the effects of mild process, high conversion rate and high product yield.

A material suitable for curing and / or foaming comprising (i) one or more epoxy resins, (ii) at least one polycarbonate, and (iii) at least one catalyst, preferably a transesterification catalyst for catalyzing the reaction of said polycarbonate.

A method for producing a (meth)acrylate monomer of a polyalkoxylated alcohol includes providing an unneutralized polyalkoxylated alcohol, wherein the unneutralized polyalkoxylated alcohol is produced by base catalyzed alkoxylation. An alkyl (meth)acrylate is transesterified with the unneutralized polyalkoxylated alcohol to produce the (meth)acrylate monomer of the polyalkoxylated alcohol. No transesterification catalyst is added during the step of transesterifying the alkyl (meth)acrylate with the unneutralized polyalkoxylated alcohol.

The invention relates to a preparation method and application of polyether glycol, the structural formula of the polyether glycol is shown in the specification, the preparation method comprises the following steps: trimethylolpropane and carbonic ester are subjected to transesterification to obtain a ketal compound, then the ketal compound is used as an initiator to polymerize ethylene oxide to obtain nonionic polyether mono-alcohol, and the nonionic polyether mono-alcohol is used as a solvent. And carrying out Williamson reaction on the polyether monoalcohol to obtain methyl-terminated polyether, and carrying out ring-opening reaction on the methyl-terminated polyether under an acidic condition to obtain the nonionic polyether glycol. The preparation process is wide in raw material source, low in cost, mild in condition, efficient in reaction and wide in industrialization prospect.