440 results about "Dibasic acid" patented technology

The invention discloses a nylon elastomer preparation method, which comprises: S1, weighing preparation raw materials of a nylon elastomer according to a feeding ratio, and weighing the preparation raw materials by using a weighing device, the nylon elastomer is prepared from the following raw materials: tridecane diamine, tridecane dibasic acid, dodecanediamine, dodecanedioic acid, undecanediamine, undecanedioic acid, decamethylene diamine, sebacic acid, pentamethylene diamine, glutaric acid, hexamethylenediamine, adipic acid, caprolactam, and one or more of polyether amine and polyether alcohol; and S2, feeding the preparation raw materials weighed in the step S1. In the preparation process of the nylon elastomer, the nylon elastomer with different melting points, different crystallization temperatures, different strengths and different elongation at break is produced by adopting a multi-component copolymerization mode and adjusting the types and the molecular weights of polyether amine and polyether alcohol by adjusting the types and the proportions of binary acid and diamine, so that the nylon elastomer is suitable for different use environments; the utilization rate is improved.

The invention discloses an efficient wet desulfurization synergist and a preparation method thereof, and relates to the technical field of flue gas desulfurization. The efficient wet desulphurization synergist comprises the following raw materials in parts by weight: 10-20 parts of sodium formate, 5-10 parts of citric acid, 20-30 parts of binary acid, 5-6 parts of a surfactant, 15-20 parts of magnesium salt, 12-18 parts of sodium salt and 2-5 parts of a pH buffer agent. The preparation method comprises the following steps: reacting cyanuric chloride with lauryl amine to generate a monosubstituted compound; then reacting with L-asparaginic acid to generate a disubstituted compound; reacting with diethylenetriamine to generate a bis-triazine ring compound; and finally, reacting with sodium 2-chloroethanesulfonate to generate the surfactant. The high-efficiency wet desulphurization synergist prepared by the invention has a desulphurization effect.

The invention discloses bio-based polyurethane as well as a preparation method and application thereof, and belongs to the technical field of polyurethane. The bio-based polyurethane is prepared from bio-based silicon-based polyester polyol, diisocyanate and a bio-based chain extender, wherein the molar ratio of the bio-based silicon-based polyester polyol to the diisocyanate to the bio-based chain extender is 1.0: (3.0-5.0): (2.0-4.0); wherein the bio-based silicon-based polyester polyol is prepared by taking bio-based dibasic acid and single-ended dihydroxy siloxane as raw materials, and carrying out esterification reaction on the bio-based dibasic acid and the single-ended dihydroxy siloxane. In the bio-based polyurethane, siloxane antifouling groups are suspended on side chains of polyurethane macromolecules, so that the bio-based polyurethane is endowed with excellent antifouling and hydrophobic properties; the mechanical property of polyurethane is good, the compatibility of siloxane and polyurethane is improved, and the polyurethane slurry has good pigment dispersion stability. In general, the comprehensive performance of the bio-based polyurethane is excellent, and the bio-based polyurethane has important economic and application significance for obtaining high-quality polyurethane products.

The invention provides a method for producing long-chain dicarboxylic acid and a long-chain dicarboxylic acid product. The method comprises the following steps: inoculating a seed solution of a fermentation strain into a fermentation tank, wherein a fermentation substrate comprises any one or more of fatty acid and derivatives thereof, and alkane; according to the method, green raw materials such as fatty acid and derivatives thereof, plant-based alkane and the like are adopted as substrates to partially or completely replace fossil energy such as petroleum alkane and the like, the product is green long-chain binary acid, and the bio-based content can be regulated and controlled. And the fermentation method provided by the invention can still maintain relatively high yield and conversion rate.

The invention relates to the field of high polymer materials, and discloses a preparation method and application of high-temperature-resistant transparent modified polyester. The preparation method comprises the following steps: 1) blending 9, 9-di-[(4-phenylphenoxy) dibenzoic acid] fluorene with diacid and dihydric alcohol, and carrying out esterification reaction; and 2) carrying out condensation polymerization on the esterification product to obtain the high-temperature-resistant transparent modified polyester with the glass transition temperature of more than 70 DEG C. According to the invention, 9, 9-di-[(4-phenylphenoxy) dibenzoic acid] fluorene is used as a modification monomer, and is copolymerized with other dibasic acids and dihydric alcohols to synthesize the modified polyester, and the modified polyester has high transparency and still has good mechanical properties and dimensional stability at high temperature. Therefore, the high-temperature-resistant transparent modified polyester is applicable to the application fields of optical films, optical lenses, reflective protective films, optical fibers or liquid crystal displays and the like.

Disclosed in the present invention are a branched-chain-containing long-carbon-chain polyester elastomer based on biomass-based 2,5-furandicarboxylic acid, and a preparation method therefor. Monomers for preparing the polyester elastomer comprise 2,5-furandicarboxylic acid or 2,5-furandicarboxylic acid ester, a dihydric alcohol and a branched-chain-containing long-carbon-chain dibasic acid. The preparation method comprises: (1) performing a melting reaction on furandicarboxylic acid or an ester thereof, a branched-chain-containing long-carbon-chain dibasic acid and a dihydric alcohol to prepare an oligomer; and (2) performing melt polycondensation on the oligomer to synthesize a furandicarboxylic acid-based branched-chain-containing long-carbon-chain polyester elastomer. By means of the branched-chain-containing long-carbon-chain polyester elastomer of the present invention, the molecular structure can be effectively designed, and the molecular weight can be regulated, thereby optimizing mechanical properties, thermal properties, barrier properties, etc. The preparation process thereof is simple, convenient and safe, and the equipment requirements and catalysis cost are relatively low. The raw material 2,5-furandicarboxylic acid used in the present invention is a potential substitute for terephthalic acid, is derived from biomass, has a wide range of sources and is environmentally friendly.

The invention provides a method for extracting and refining long-chain dicarboxylic acid and a product, and the method comprises the following steps: (1) carrying out heating treatment on fermentation liquor of long-chain dicarboxylic acid to reduce the content of insoluble substances in the fermentation liquor so as to obtain mixed feed liquor in which the dry weight ratio of the insoluble substances is less than 4wt%; (2) filtering the mixed material liquid to obtain filtrate, carrying out acidification crystallization treatment and solid-liquid separation treatment on the filtrate through or without decoloration treatment to obtain a first solid; and (3) refining the first solid. The extraction and refining method provided by the invention can improve the purity and quality of the long-chain dicarboxylic acid product, and the product has large particle size, is simple and easy to operate, and is beneficial to large-scale industrial production.

The invention relates to the technical field of polymer dye synthesis, in particular to a polymer coloring agent based on a binary acid chromophoric monomer, a color master batch, a fiber and a preparation method of the polymer coloring agent. The structural formula of the diacid chromophoric monomer is as follows: # imgabs0. The chromophoric monomer has extremely high thermal stability, and can maintain the chemical structural integrity and chromophoric performance in a high-temperature environment (250 DEG C). The heat-resistant characteristic is mainly derived from a highly stable aromatic skeleton formed by a parent nucleus through an expanded conjugated system and a rigid plane structure, and heat vibration energy is effectively dispersed; in addition, a thermal stable group (an all-carbon skeleton) is introduced through side chain modification to form a steric hindrance effect, and molecular movement at high temperature is inhibited. Due to the unique heat resistance of the monomer, the monomer can be completely matched with a high-temperature processing window (240-300 DEG C) of a polyester melt polymerization process, and a polymer-dye composite system with a stable structure is constructed through covalent bonding in ester exchange and polycondensation processes.

The invention relates to the technical field of high polymer materials, and discloses self-repairing bio-based polyester resin for a matte powder coating as well as a preparation method and application of the self-repairing bio-based polyester resin. The bio-based polyester resin is prepared from the following preparation raw materials in percentage by mole: 20 mol% to 40 mol% of bio-based flexible diol, 20 mol% to 35 mol% of bio-based furandicarboxylic acid, 10 mol% to 25 mol% of isosorbide, 5 mol% to 25 mol% of itaconic acid, 1 mol% to 15 mol% of long-chain bio-based aliphatic dibasic acid, 1 mol% to 10 mol% of bio-based citric acid, 0.1 mol% to 2.0 mol% of zinc acetylacetonate, 0.1 mol% to 1.0 mol% of a microcapsule corrosion inhibitor, 0.1 mol% to 1.0 mol% of an esterification catalyst and 0.1 mol% to 1.5 mol% of an antioxidant. The bio-based polyester resin does not contain petroleum-based monomers and is high in biochar content.

The invention discloses a high-barrier material based on a PET aminolysis monomer and a preparation method of the high-barrier material, and belongs to the technical field of high polymer materials. The preparation method comprises the following steps: carrying out aminolysis reaction on polyethylene glycol terephthalate (PET) to prepare a dihydric alcohol monomer containing an amido bond, and carrying out polymerization reaction on the dihydric alcohol monomer and aliphatic dibasic acid to prepare a polyesteramide (PEA) material. The prepared PEA material has excellent oxygen barrier property and toughness, the oxygen barrier property of the PEA material is obviously superior to that of a PET material, and the barrier property and mechanical property of the PEA material can be regulated and controlled by changing the length of a methylene chain segment of the aliphatic dibasic acid monomer. The aliphatic dibasic acid monomer can be derived from biomass resources, the reaction condition is mild, the process is simple, and the method is suitable for industrial large-scale production.

The invention relates to a composite water reducing agent for lithium slag concrete as well as a preparation method and application thereof, and the composite water reducing agent comprises the following raw materials in parts by weight: 40-60 parts of a siloxane modified polycarboxylic acid polymer solution, 25-40 parts of a POSS-based silane coupling agent, 3-5 parts of polyethylene glycol and 20-25 parts of an alkali activator. The POSS-based silane coupling agent is prepared by carrying out a Michael addition reaction on acryloyloxy silane and amino propyl heptyl-polyhedral oligomeric silsesquioxane according to a molar ratio of 1: (1 to 1.03); the siloxane modified polycarboxylic acid polymer solution is prepared by polymerizing polymeric monomers, namely a monoalkenyl polyether monomer, an acrylic monomer, monoalkenyl dibasic acid and unsaturated siloxane in the solution according to a molar ratio of 1: (2-3): (2-3): (0.1-0.3), and the solid content of the polycarboxylic acid polymer solution is 40-50wt%. Under the synergistic and balanced effects of all the components of the composite water reducer, the workability of the lithium slag concrete can be remarkably improved, and the water reducing effect of the water reducer is fully exerted.

The invention provides a novel hindered amine light stabilizer as well as a preparation method and application thereof, and relates to the field of light stabilizers. According to the preparation method of the novel hindered amine light stabilizer, specific dibasic acid dimethyl ester and 2, 2, 6, 6-tetramethylpiperidinol are used as raw materials, an alkane solvent or a benzene solvent is used as a solvent, and a catalytic reaction solution is obtained through a heating reaction under the condition of a catalyst; and neutralizing and washing the catalytic reaction liquid to obtain the novel hindered amine light stabilizer. According to the preparation method, ideal preparation effects (such as purity, yield and the like) can be achieved, meanwhile, the chroma of the product is effectively reduced, the problem that the product is prone to yellowing due to the fact that the hindered amine light stabilizer absorbs visible light is solved, and the compatibility and stability of the hindered amine light stabilizer and a high polymer material are further improved.

The invention provides a method for extracting and purifying long-chain dicarboxylic acid from fermentation liquor, which comprises the following steps: (1) controlling the pH value of the fermentation liquor to be less than or equal to 5 and the density to be 0.9-1.16 g / cm < 3 > to obtain a first solid-liquid mixture; (2) centrifuging the first solid-liquid mixture to obtain a second solid-liquid mixture of which the content of long-chain dibasic acid is greater than that of other solid substances and a third solid-liquid mixture of which the content of long-chain dibasic acid is smaller than that of long-chain dibasic acid in the second solid-liquid mixture; and (3) separating the second solid-liquid mixture to obtain the long-chain dicarboxylic acid. The method is simple to operate, low in equipment requirement and investment and high in treatment efficiency. And most thalli and impurities in the fermentation liquor are removed through centrifugal separation. And the obtained product has high purity and high product yield.

The invention discloses a cold-resistant material, which is prepared from the following raw materials in parts by weight: 20 to 25 parts of EVA (Ethylene Vinyl Acetate) with the VA (Vinyl Acetate) content of 28 percent, 15 to 20 parts of EVA with the VA content of 18 percent or 33 percent, 10 to 15 parts of cold-resistant mixture, 15 to 20 parts of POE (Polyolefin Elastomer), 5 to 6 parts of ethylene propylene diene monomer, 6 to 8 parts of wear-resistant agent, 0.3 to 0.5 part of stearic acid, 0.5 to 0.6 part of zinc stearate, 0.8 to 1.0 part of zinc oxide, 0.35 to 0.40 part of bridging agent and 3.0 to 3.2 parts of high-temperature foaming agent, wherein the cold-resistant mixture comprises 50-60 parts of SEBS, 20-30 parts of aliphatic dibasic acid ester, 10-20 parts of EVA with the VA content being 40% and 10-20 parts of naphthenic oil, the content of styrene in the SEBS is 20%, the content of butadiene is 80%, the raw materials are sequentially subjected to mixing, granulation, secondary mixing and secondary granulation, and the cold-resistant material with the good cold resistance is obtained and can be applied to shoe sole manufacturing.

The invention relates to a method for recycling polyethylene plastic through catalytic oxidation cracking, and belongs to the technical field of plastic recycling. The method comprises the following steps: mixing a Co / Al2O3 catalyst, polyethylene plastic and water, and carrying out a catalytic reaction in an oxygen-containing atmosphere at a set temperature, so that the polyethylene plastic is converted into binary acid, thereby obtaining a reaction solution. The low-price Co / Al2O3 catalyst is applied to catalytic oxidation cracking of the polyethylene plastic, the polyethylene plastic is converted into the binary acid, the yield of the binary acid is stabilized at 70% or above and reaches 115% at most, and the Co / Al2O3 catalyst is low in price and low in cost. The low-cost and low-energy-consumption improvement of the yield of the binary acid converted from the polyethylene plastic through catalytic oxidation cracking is fully realized, and a new way is provided for the high-value conversion of the polyethylene plastic.

The invention provides a preparation method of a hydrogenated cycloolefin polymer, which comprises the following steps: reacting a cycloolefin polymer with hydrogen in the presence of a hydrogenation catalyst and a hydrogenation aid to obtain the hydrogenated cycloolefin polymer, the hydrogenation auxiliary agent is selected from one or more of aliphatic dibasic acid esters, phthalate esters and benzene polyacid esters. Compared with the prior art, in the presence of the hydrogenation catalyst and the hydrogenation auxiliary agent, the cycloolefin polymer and the hydrogen are subjected to hydrogenation reaction, and an induced dipole is induced in the adjacent cycloolefin polymer through the hydrogenation auxiliary agent molecule with an inherent dipole; the molecular attraction between the induced dipole and the inherent dipole destroys the entanglement of the original molecular chain, and the friction force between the cycloolefin polymer molecules is reduced, so that the viscosity between the polymers is reduced, and the mass transfer effect of the reaction is improved; meanwhile, intramolecular electron conjugation can be inhibited, double bonds in molecules in the hydrogenation process can be damaged more easily, the hydrogenation efficiency is improved, and then the production efficiency is improved.

The invention provides a polyamide elastomer and a preparation method thereof. The method comprises the following steps: (1) under the action of a first catalyst, carrying out condensation polymerization on a poly-diol compound and a binary acid monomer in a solvent to obtain an end-capping reagent; (2) under the action of a second catalyst, an end-capping reagent and a comonomer are subjected to a contact reaction, and a polyamide block is obtained; and (3) in the presence of a stabilizer and under the action of a third catalyst, carrying out contact reaction on the soft segment and the polyamide block to obtain the polyamide elastomer, wherein the polydihydric alcohol compound is polyalkylene ether glycol with the number-average molecular weight of 150-2000, and the stoichiometric ratio of the polydihydric alcohol compound to the binary acid monomer is 1: (2.0-2.4); the comonomer is C4-C12 lactam and / or C4-C12 amino carboxylic acid; and the soft segment is a hydroxyl-terminated diol polymer. According to the invention, the performance loss of the hard-segment-dominated material is not caused on the basis of improving the soft-segment-dominated material mechanical property of the product, and the polyamide elastomer product with excellent comprehensive performance is obtained.

The invention provides aliphatic polyester and application thereof, the aliphatic polyester comprises dibasic acid residues and dihydric alcohol residues, the dibasic acid residues comprise the following residues: a1) 65-90 mol% of succinic acid residues based on 100 mol% of the total mole percentage of a1) and a2), and a2) 10-20 mol% of dihydric alcohol residues based on 100 mol% of the total mole percentage of a1) and a2); a2), 10-35 mol% of sebacic acid residues based on 100 mol% of the total mole percentage content of a1) and a2); the dihydric alcohol residues are selected from 1, 4-butanediol residues which are at least equal to the dibasic acid residues in molar weight; the aliphatic polyester contains an oligomer of which the number-average molecular weight measured by GPC is less than 1000, and the mass percentage content of the oligomer of which the number-average molecular weight measured by GPC is less than 1000 in the aliphatic polyester is 0.08-3.5 wt%. The packaging film prepared from the aliphatic polyester has good food contact performance and uncoiling performance.

The present invention relates to a photosensitive resin composition, a solder resist ink, a dry film and a cured product, the photosensitive resin composition contains an epoxy acrylic resin having a specific structure, and the epoxy acrylic resin having the specific structure is formed by adding an alpha, beta, beta, beta, beta, beta, beta, beta, beta, beta, beta, beta, beta, beta, beta, beta, beta, beta, beta, beta, beta, beta, beta, beta, beta, beta, beta, beta, beta, beta, beta, beta, beta, beta, beta, beta, and then adding dibasic acid anhydride to the beta-unsaturated monobasic acid a1 and the monobasic acid a2 with a specific structure. According to the invention, a certain proportion of monobasic acid a2 with a special structure is introduced into epoxy acrylate, so that the dispersibility of the photosensitive resin composition to pigments and fillers can be effectively improved; and the water absorption of the cured product is reduced, so that the lead-free tin spraying resistance and the wave soldering resistance are improved.

The invention provides an innovative solution of a bio-based synergistically modified polyester material, aiming at the problems of insufficient barrier property, lack of antibacterial property and the like of the traditional polyethylene glycol terephthalate (PET) material and the industrial problem of limited application scenes of food packaging, medical protection and the like caused by the problems of insufficient barrier property, lack of antibacterial property and the like. According to the scheme, the preparation method of the bio-based high-barrier antibacterial copolyester comprises the following steps: mixing 50-70 parts of binary acid, 20-40 parts of dihydric alcohol and 1-5 parts of an antibacterial agent, and carrying out esterification reaction to synthesize a PET antibacterial agent prepolymer; according to the invention, through a dual modification strategy of FDCA modified structure (using furandicarboxylic acid to replace part or all of terephthalic acid as a polymeric monomer) and natural antibacterial agent in-situ bonding, the synergistic breakthrough of barrier property and antibacterial efficiency in the polyester material is realized for the first time.

The invention relates to the technical field of sizing agent preparation, and discloses polyamide and a preparation method thereof as well as a sizing agent and application thereof. The method comprises the following steps: reacting a monomer 1, a monomer 2, an optional monomer 3, triphenyl phosphate, a catalyst and an organic solvent in an inert atmosphere; wherein the monomer 1 is binary acid containing a sulfonate group, the monomer 2 is diamine, the monomer 3 is aliphatic binary acid, and the catalyst contains an organic catalyst and a metal inorganic salt catalyst. The polyamide provided by the invention has relatively high solubility; the polyamide and a polyamide resin matrix have good bonding performance, and the bonding performance of carbon fibers and polyamide resin can be greatly improved by using the polyamide as a sizing agent of the carbon fibers.

The invention belongs to the technical field of plasticizers, and particularly relates to a preparation method of a bio-based plasticizer. The invention provides a preparation method of a bio-based plasticizer, which comprises the following steps: carrying out esterification reaction on dibasic acid, oleic acid and dihydric alcohol under the action of a catalyst to obtain dibasic acid oleic acid dihydric alcohol ester; and carrying out epoxidation reaction on the diacid oleic acid dihydric alcohol ester and hydrogen peroxide under the action of weak acid and a catalyst to obtain the bio-based plasticizer. Dibasic acid, oleic acid and dihydric alcohol are used as raw materials, the bio-based plasticizer is synthesized through esterification reaction and epoxidation reaction, the plasticizer is applied to PVC, the machinable time of a PVC product on an open mill can be remarkably prolonged to 120 min or above, and the plasticizer has excellent extraction resistance and good aging resistance in various liquids and can be used for preparing PVC products. The plasticizer is a nontoxic plastic plasticizer with excellent properties.

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.

The invention belongs to the technical field of polyamide elastomers, and particularly relates to a polyamide elastomer and a method for preparing the polyamide elastomer through a one-pot method. The method for preparing the polyamide elastomer by the one-pot method comprises the following steps: (1) adding diamine, binary acid, polyether, deionized water and an auxiliary agent into a reaction container, carrying out heating reaction for the first time, then discharging to normal pressure, carrying out heating reaction again, and removing water and volatile components; (2) pre-diluting the esterification catalyst, adding the pre-diluted esterification catalyst into the reaction container, stirring, carrying out esterification reaction, then carrying out vacuum polymerization, and discharging and granulating after the reaction end point is reached to obtain a polyamide elastomer material; the one-pot polymerization process disclosed by the invention is beneficial to reducing the phase separation degree of a polyether soft segment and a polyamide hard segment; an esterification catalyst is added in the step (2), so that the phase separation degree of soft and hard segments can be better regulated and controlled, and the product performance is improved.

The invention discloses antibacterial and antistatic nylon as well as a preparation method and application thereof, and relates to the technical field of antibacterial materials. The preparation method of the antibacterial and antistatic nylon comprises the following steps: reacting a first mixed reaction system containing hexamethylenediamine, furandicarboxylic acid, binary acid and water to prepare a carboxyl-terminated prepolymer; and reacting a second mixed reaction system containing the carboxyl-terminated prepolymer, PEG (Polyethylene Glycol) and tetrabutyl titanate in a protective atmosphere to prepare the antibacterial and antistatic nylon block copolymer. The antibacterial and antistatic nylon prepared through condensation polymerization can improve the antibacterial performance of the PA66 base material, can also improve the antistatic performance of the PA66 base material, and can be used for preparing the antibacterial and antistatic PA66 material.

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 provides a preparation process for producing mixed dibasic acid dimethyl ester by using ionic liquid as a catalyst, which belongs to the technical field of fine chemical engineering, and comprises the following steps: S1, dissolving carbazole in anhydrous acetonitrile, adding bromoethane, reacting, then carrying out rotary evaporation, washing and precipitating, dissolving the precipitate in ethanol, then adding a LiHSO4 solution for ion exchange, centrifuging, and then carrying out vacuum drying to obtain mixed dibasic acid dimethyl ester; the carbazolyl ionic liquid catalyst is obtained; and S2, adding the carbazolyl ionic liquid catalyst, mixed binary acid and methanol into a pre-reactor, reacting to obtain a pre-reaction solution, feeding the pre-reaction solution into an extraction tower, adding an ionic liquid-methanol mixed solution, carrying out countercurrent reaction-extraction to obtain a light-phase product from the top of the extraction tower, carrying out silica gel adsorption, feeding the light-phase product into a rectifying tower, and removing methanol to obtain the carbazolyl ionic liquid. And stirring, adsorbing and filtering to obtain the mixed dibasic acid dimethyl ester. According to the invention, the purposes of high product purity, production process optimization and cost reduction can be achieved.

The invention belongs to the technical field of polyurethane, and discloses a closed polyurethane hot melt adhesive as well as a preparation method and application thereof, and the preparation method of the closed polyurethane hot melt adhesive comprises the following steps: (1) mixing dihydric alcohol and polyester dihydric alcohol, and adding isocyanate for reaction under the protection of inert gas to obtain a polyurethane prepolymer; (2) adding a sealing agent into the reactor, and carrying out a sealing reaction to obtain a sealed polyurethane prepolymer; and (3) continuously adding a catalyst and binary acid into the reactor, and uniformly stirring to obtain the closed polyurethane hot melt adhesive, the binary acid is selected from at least one of C5-C8 straight chain aliphatic binary acid. The closed polyurethane hot melt adhesive prepared by the invention is applied to bonding of nylon materials, and the problems that the bonding strength stability of cloth at high temperature is poor and the storage time of the glued cloth is short can be effectively solved.

The invention relates to the technical field of high polymer materials, and discloses high-fluidity nylon resin and a preparation method thereof. The high-fluidity nylon resin comprises aliphatic amide salt and an accelerant, wherein the accelerant is one or a mixture of more of chemicals such as unit acid, binary acid, polybasic acid, unit amine, diamine and polyamine. According to the high-flowability nylon resin disclosed by the invention, the accelerant is added, and a polyamide macromolecular chain is changed from a linear shape into a wound spherical shape through molecular structure design, so that the flowability of the resin is greatly improved under the condition of keeping the high molecular weight of the resin, namely the same level of the relative viscosity of the resin.

Provided are a polyester-based plasticizer which is excellent in cold resistance, non-migration, oil extraction resistance, volatility resistance and the like in a well-balanced manner, which particularly allows a molded article to be excellent in oil extraction resistance and transparency, and which can be produced from a biomass resource, and a vinyl chloride-based resin composition containing the polyester-based plasticizer and a molded article thereof. A polyester-based plasticizer obtained from a dibasic acid component (A), a glycol component (B), a hydroxy acid component (C), and an end termination component (D), wherein the component (A) is one or more selected from the group consisting of sebacic acid, azelaic acid and succinic acid, the component (B) is one or more selected from the group consisting of 1,2-propylene glycol, 1,3-propylene glycol, 1,3-butanediol and 1,4-butanediol, the component (C) is 12-hydroxystearic acid, and the end termination component (D) is one or more selected from the group consisting of a monovalent fatty acid having 8 to 12 carbon atoms and a linear monohydric alcohol having 6 to 10 carbon atoms.