670 results about "Polycondensation reaction" patented technology

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 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 discloses a graded porous mordenite catalyst as well as a preparation method and application thereof, and belongs to the technical field of heterogeneous catalysis and chemistry and chemical engineering. The preparation method comprises the following steps: carrying out hydrolysis-polycondensation reaction on a silicon source, an aluminum source, an alkali source and water, after the reaction is completed, adding an alpha, omega-biquaternary ammonium salt surfactant as a template agent, and carrying out template-oriented self-assembly reaction to obtain gel; carrying out hydrothermal crystallization treatment on the gel to obtain zeolite raw powder; roasting the zeolite raw powder for the first time to remove the template agent so as to obtain roasted zeolite; and carrying out ion exchange treatment on the roasted zeolite, and roasting again to obtain the graded porous mordenite catalyst. According to the invention, the alpha, omega-biquaternary ammonium salt surfactant is used as the template agent to prepare the hierarchical porous structure catalyst with both inherent micropores and uniform mesopores, so that mass transfer can be improved and acidic sites can be optimized.

The present invention relates to a dental diaphragm copolyester and a preparation method thereof, the preparation method comprises the following steps: 2, 5-furandicarboxylic acid or an ester thereof, aliphatic or alicyclic diol and (2-hydroxy-5-formyl phenyl) diphenylborane are subjected to a reaction to obtain an esterification or ester exchange product; and carrying out condensation polymerization on the esterification or ester exchange product and the stabilizer to prepare the copolyester for the dental diaphragm. 2, 5-furandicarboxylic acid is derived from a renewable biomass resource and meets the requirements of green and sustainable development; compared with terephthalic acid and furan ring structures, the film has higher rigidity and polarity, the yield of hot press molding is improved, the same correction force can be met by a thinner film, the wearing comfort of a patient is improved, and meanwhile stress relaxation is improved; the catalyst perfectly combines strong Lewis acidity, intramolecular stabilization and potential bifunctional activation through structural design, provides possibility for efficient and green synthesis of polyester, avoids use of heavy metal, and is higher in biological safety.

The invention relates to the field of pipes, and discloses a high-flame-retardance MPP cable protection pipe and a preparation method thereof.The cable protection pipe comprises polypropylene resin, modified graphene oxide, modified maleic anhydride grafted polypropylene and auxiliaries; the modified graphene oxide is prepared by grafting a modified benzotriazole intermediate and a double-bond DOPO derivative substituted cyclotriphosphazene derivative into graphene oxide; the modified benzotriazole intermediate is prepared by grafting 2-(2, 4-dihydroxyphenyl)-2H-benzotriazole and ethyl bromoacetate, and then reacting with 2, 2, 6, 6-tetramethyl-4-piperidinol; the double-bond DOPO derivative is prepared through the reaction of DOPO-HQ and 4-vinyl benzyl chloride; the modified maleic anhydride grafted polypropylene is prepared by grafting octa-aminopropyl polyhedral oligomeric silsesquioxane prepared by a polycondensation reaction of 3-aminopropyltriethoxysilane and maleic anhydride grafted polypropylene. The pipe prepared by the invention has good mechanical properties, ultraviolet aging resistance, low-temperature toughness, heat resistance, flame retardance and wear resistance.

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 batteries, and particularly relates to a silicon-carbon negative electrode material based on spheroid phenolic resin and a preparation method thereof.The preparation method comprises the steps that a phenolic monomer, an aldehyde monomer, a basic catalyst and a pore-foaming agent are mixed in deionized water to form a water phase, then an oil phase containing the oil monomer and an emulsifier is added into the water phase, and the mixture is stirred to be uniform; carrying out inverse emulsion polycondensation reaction, and curing to obtain sphere-like phenolic resin; the preparation method comprises the following steps: heating spheroidic phenolic resin, carrying out pre-oxidation treatment, heating in an inert atmosphere, carrying out carbonization reaction, cooling, dipping in an activator, and carrying out gradient activation treatment to obtain spheroidic porous carbon; the spheroid porous carbon is degassed under vacuum and then placed in a chemical vapor deposition reaction cavity, silicon source gas is introduced for deposition reaction after heating, a deposition precursor is obtained, the outer surface of the deposition precursor is coated with a carbon source and a nitrogen source, and the silicon-carbon negative electrode material based on the spheroid phenolic resin is obtained after high-temperature reaction. And the problems of cycle attenuation and rate capability reduction are effectively solved.

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 relates to the technical field of silicon dioxide aerogel, and particularly discloses hydrophobic chitosan grafted silicon dioxide aerogel and a preparation method thereof. The preparation method comprises the following steps: mixing tetraethoxysilane, deionized water and N, N-dimethylformamide to prepare a silicon solution A; mixing glacial acetic acid, deionized water and chitosan with the molecular weight of 1-100 thousand Da to prepare a chitosan solution B; mixing the silicon solution A and the chitosan solution B to prepare a mixed solution C, wherein the mass ratio of chitosan to tetraethoxysilane is 1: (90-110); adjusting the pH value of the mixed solution C to 2-4, and hydrolyzing at 40-50 DEG C for 75-120 minutes to obtain sol D; adjusting the pH value of the sol D to 7-8, and carrying out condensation polymerization for 20-60 minutes to obtain gel E; sequentially carrying out aging treatment, modification treatment and freeze drying to obtain the hydrophobic chitosan grafted silicon dioxide aerogel. The hydrophobic chitosan grafted silicon dioxide aerogel prepared by the preparation method disclosed by the invention has a relatively good three-dimensional nano network pore structure, mechanical property, hydrophobic property and heat-insulating property, and is beneficial to batch production.

The invention relates to the field of comprehensive utilization of biomass energy, and particularly discloses a process for preparing biological coal based on atmospheric distillation of biochar and biological oil, which comprises the following steps: performing atmospheric distillation on unpickled biochar or pickled biochar and biological oil to finally obtain light fraction and biological coal; biochar which is not subjected to acid pickling or biochar subjected to acid pickling serves as an in-situ catalyst, rich pores and oxygen-containing functional groups of the biochar can synergistically catalyze bio-oil to be subjected to condensation polymerization such as esterification and etherification, and finally the prepared bio-coal is good in combustion performance and high in productivity; the process is simple and controllable, and large-scale industrial production is expected to be carried out.

This invention discloses a covalent organic framework material for selective solid-phase adsorption and separation, its preparation method, and its applications. The material is prepared by polycondensation reaction of electron-deficient triazine rings with short-chain linkers such as hydrazine hydrate, forming a layered structure with a high specific surface area of ​​602 m² / g and a concentrated pore size of 2.0 nm to 3.0 nm. This structure exhibits high adsorption capacity (up to 1.0 mg / g), rapid adsorption kinetics, and excellent selectivity for PAHs in organic solutions through strong π-π interactions and pore confinement effects. The preparation process is simple and the conditions are mild. The material has good thermal stability (>300℃), and its performance retention rate is higher than 92% after 5 cycles. When applied to the solid-phase adsorption of PAHs in petroleum products such as lubricating oil and white oil, it effectively eliminates matrix interference, allowing direct analysis without complex purification steps after adsorption. This overcomes the limitations of traditional materials such as silica gel and activated carbon, which have weak adsorption capacity and require cumbersome post-treatment, providing a new high-performance adsorption material solution for the efficient detection of trace PAHs in petroleum products.

The present invention relates to coating compositions that can be applied to the surface of a substrate to form a durable, non-stick coating. The coating compositions can include a basecoat composition and a topcoat composition for forming a basecoat and a topcoat applied over the basecoat. The basecoat can include one of an organic polymer, a sol-gel composition, and a silicone resin. The basecoat composition and the resulting basecoat can further include reinforcing particles. The topcoat can include a siloxane matrix formed from one of a hydrosilylation reaction, a dehydrocoupling reaction, and a polycondensation reaction. The basecoat and the topcoat can each be substantially free of a fluoropolymer component.

The invention provides a production system for preparing two-dimensional aromatic polyamide based on a liquid-phase loop tube, and relates to the technical field of two-dimensional aromatic polyamide production, and the production system comprises a loop tube core reaction module used for carrying out a two-dimensional aromatic polyamide polycondensation reaction through a loop tube reactor; the intelligent regulation and control module is used for monitoring operation parameters of the ring pipe core reaction module in real time and generating a reaction parameter regulation and control instruction and a heat dissipation optimization strategy. Strong turbulent flow is generated in the loop reactor through high-speed circulating flow of the axial flow pump, continuous and uniform shearing and mixing are provided for reaction materials, a retention area possibly formed by high-viscosity fluid can be effectively broken, full contact of monomers, oligomers and growing two-dimensional lamellas is ensured, the mass transfer efficiency is improved, and the mass transfer efficiency is improved. Non-uniform local concentration and a reaction dead zone are avoided; dynamic optimization and safety interlocking protection of reaction parameters are realized by combining a kinetic model, so that the reaction controllability is improved, the production risk is reduced, and the product conversion rate and the molecular weight stability are guaranteed.

The invention discloses a high-temperature-resistant water-based polyimide sizing agent for carbon fibers, modified carbon fibers, a resin-based composite material of the modified carbon fibers, a preparation method and application of the resin-based composite material, and belongs to the technical field of advanced composite materials. The sizing agent disclosed by the invention is prepared by carrying out condensation polymerization on aromatic dianhydride and monofunctional aromatic amine to generate polyamide acid and then carrying out an ionizing salt formation process. The sizing agent has excellent storage stability and thermal stability, can effectively improve the wettability of the carbon fiber surface, and significantly improves the interface bonding performance of the carbon fiber reinforced polyimide composite material. The sizing agent provided by the invention can remarkably improve the room-temperature and high-temperature interface bonding strength of the carbon fiber reinforced polyimide composite material, and is suitable for the fields of aerospace, high-end equipment manufacturing and the like.

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.

The invention relates to polyethersulfones which can be used as engineering thermoplastics and also as polymers suitable for use in membrane technologies. A method for producing a polyethersulfone includes carrying out a nucleophilic polycondensation between 4,4'dioxydiphenyl sulfone and 4,4'dichlorodiphenyl sulfone in the presence of potassium carbonate in an aprotic solvent environment in two steps of: a) obtaining a dipotassium salt of 4,4'dioxydiphenyl sulfone and b) adding 4,4'dichlorodiphenyl sulfone to the salt obtained in the first step, then holding the resulting mixture while controlling the viscosity thereof to provide a mixture containing a polyethersulfone in a dissolved form in which the mass fraction of the polymer is from 50.5 to 53.3%, isolating the polyethersulfone and drying same. The invention makes it possible to produce a high-molecular-weight polyethersulfone having a controlled set mass-average molecular mass of from 85340 to 104300 g / mol, rendering the polymer suitable for use in the production of finished articles.

This invention belongs to the field of semiconductor packaging, and provides a photosensitive resin, its preparation method, and a photosensitive resin composition. The photosensitive resin is formed by an electrophilic substitution reaction of a phenolic prepolymer and an electrophilic reagent. The phenolic prepolymer is formed by a polycondensation reaction of monomer I (structure shown in Formula 1) and monomer II (structure shown in Formula 2), wherein m and n independently represent 1 or 2, and Ar is an aryl group with 6 to 18 carbon atoms. When this resin is applied to a photosensitive resin composition, the cured material formed by the composition possesses good etching resistance, mechanical properties, and high thermal stability.

The invention relates to polyfurandicarboxylic acid glycol ester resin as well as a preparation method and application thereof, and belongs to the technical field of organic high-molecular compounds. The preparation method of the polyethylene furandicarboxylate resin provided by the invention comprises the following steps: S1, mixing 2, 5-furandicarboxylic acid, ethylene glycol, a catalyst and an inhibitor, and carrying out esterification reaction to obtain an ester; and S2, carrying out low-pressure condensation polymerization on the ester obtained in the step S1 to obtain the polyethylene furandicarboxylate resin, the inhibitor is ethylene carbonate; according to the GB / T14571.2-2018 standard, based on the chromatographic purity of the ethylene glycol, the chromatographic peak area of the inhibitor in the mixture of the ethylene glycol and the inhibitor is 0.05%-0.6% of the sum of the chromatographic peak area of the inhibitor and the chromatographic peak area of the ethylene glycol. The preparation method can effectively reduce the content of acetaldehyde in the polyethylene furandicarboxylate resin.

The invention discloses waterborne polyester as well as a preparation method and application thereof. The preparation method comprises the following steps: putting an intermediate compound into a pre-polycondensation product to carry out polycondensation reaction; wherein the pre-polycondensation product is a product obtained by adding an auxiliary agent into an ester and carrying out polycondensation reaction until the hydroxyl value reaches 80 mgKOH / g-100 mgKOH / g, the chemical structural formula of the ester is shown in the specification, R1, R2 and R3 are independently selected from C4-C12 alkyl groups or aryl groups, R4 and R5 are independently selected from C2-C9 alkyl groups; the chemical structural formula of the intermediate compound is shown in the specification, R6 is C3-C6 alkyl, and R7 is methyl or ethyl. The super-hydrophilic coating prepared from the water-based polyester prepared by the method has super-hydrophilicity, high wear resistance and long service life, and is suitable for the fields of building glass, medical equipment, automobile glass, electronic screens and the like which require antifogging, self-cleaning and durability requirements.

The invention discloses a semi-aromatic transparent polyamide material and a preparation method thereof, and belongs to the technical field of high polymer materials. The material is a random copolymer prepared by condensation polymerization of aromatic dibasic acid, aliphatic diamine and a multifunctional comonomer, the multifunctional comonomer has a general formula of H2N-R3-(R2-O) n-R1-(O-R2) n-R3-NH2, under the protection of inert gas, the raw materials are mixed with water, a catalyst and an end-capping reagent to form a slurry, the slurry is heated, pressurized and pre-polymerized, the pre-polymerized slurry is cooled to room temperature, and a finished product is obtained. And carrying out decompression dehydration or solid phase polycondensation to obtain a final product. The semi-aromatic transparent polyamide material synchronously realizes high transparency, high heat resistance and excellent mechanical properties, solves the problem of performance balance in the prior art, and is suitable for the high-end fields of optical lenses, electronic device shells, automobile lampshades and the like.

The invention discloses a preparation method of mesophase pitch regulated and controlled by plasma-assisted directional bromination and catalytic debromination, and belongs to the technical field of high-value utilization of heavy oil and preparation of advanced carbon materials. The method comprises the following steps: (1) by taking aromatic hydrocarbon-rich heavy oil as a raw material, carrying out low-temperature plasma-assisted liquid-phase bromination reaction, and directionally introducing bromine atoms on an aromatic ring as activation and orientation sites, so as to construct bromination modified linear precursor asphalt; (2) carrying out supported metal hydride catalytic debromination-directional polycondensation reaction to synchronously realize total removal of bromine atoms, linear coupling between aromatic rings and improvement of molecular planarity, so as to prepare pre-mesophase pitch; and (3) carrying out heat treatment in a strong and uniform magnetic field, and enabling the liquid crystal state molecules to be highly and orderly arranged along the direction of the magnetic field by virtue of the orientation effect of the magnetic field on the pi electron cloud, so as to finally form the spinnable mesophase pitch with a wide-area streamline structure. The method realizes full-chain accurate regulation and control from molecular structure design to macroscopic orientation, and the prepared mesophase pitch has the characteristics of high anisotropic content (greater than 98%), moderate softening point (260-300 DEG C), highly ordered molecular arrangement and low quinoline insoluble content (less than 0.1%). The process is novel, and a brand new path is provided for preparing the high-performance mesophase pitch.

The invention relates to a preparation method and application of a CoNi alloy nanoparticle doped double-shell hollow carbon material, and belongs to the field of nano material preparation technology and electromagnetic wave absorption application. 3-aminophenol and formaldehyde are subjected to a condensation polymerization reaction to synthesize phenolic resin balls, the phenolic resin balls are placed in 3-aminophenol and formaldehyde again to react, and the double-shell hollow phenolic structure is obtained. And adding the double-shell hollow phenolic aldehyde structure into cobalt nitrate hexahydrate (Co (NO3) 2.6 H2O) and 2-methylimidazole for low-temperature reaction, then adding a solution of (Ni (NO3) 2.6 H2O) for reaction at high temperature and high pressure, and drying to obtain the CoNi alloy nanoparticle doped double-shell hollow carbon material. According to the preparation method disclosed by the invention, the double-shell structure is taken as a main template, and the CoNi alloy nanoparticles are used as active components to be doped in the double-shell hollow structure in situ, so that the cascade synthesis of the microstructure of the nano material is greatly enriched, and the obtained CoNi alloy nanoparticle doped double-shell hollow carbon material has excellent electromagnetic wave absorption performance.

The invention relates to a reactor, in particular for carrying out polycondensation or depolymerization reactions, comprising at least one inlet, at least one product outlet line, a liquid zone, an inner zone arranged above the liquid zone, and a gas zone comprising at least one gas outlet line, wherein the gas zone is arranged above the inner zone, and wherein the gas zone has a larger cross-sectional area than the inner zone, and wherein the gas zone comprises a demisting element connected to a scrubbing liquid inlet disposed in the gas zone and a scrubbing liquid outlet disposed in the gas zone, and wherein the inner region comprises one or more inner components selected from the group consisting of a structured packed bed, a random packed bed and a hybrid heat exchange element for increasing the surface to volume ratio within the inner region wherein the one or more inner components have a specific surface area of 10 to 1,000 m2 / m3.

The application belongs to the field of high polymer chemistry, and relates to a hyperbranched carbon dioxide-based polycarbonate as well as a preparation method and application thereof. The hyperbranched carbon dioxide-based polycarbonate is prepared by self-condensation polymerization of a monomer shown in formula I; in formula I, it is a three-arm structural unit derived from an initiator; and it is a carbon dioxide-based polycarbonate segment obtained by ring-opening addition polymerization of an epoxide and carbon dioxide. Compared with the prior art, the application has the following advantages: the application uses triethylborane catalyst and a mixture of TBD or DBU as a catalyst, efficiently catalyzes copolymerization of carbon dioxide and an epoxide monomer to prepare a hyperbranched carbon dioxide-based polycarbonate with a new structure, and improves the glass transition temperature and fat dissolving performance of the polymer.

The invention relates to a special method for producing hydroxyl-terminated polyester alcohols by two-stage polycondensation reactions, to the polyester alcohols obtained by this method, and to the use of these polyester alcohols for producing polyurethanes.

The application discloses a preparation method of a lithium ion battery adhesive and the product. The preparation method of the adhesive comprises the following steps: first, taking a bisphenol A type diether dianhydride and a functional group-containing diamine into a polar aprotic solvent to perform a polycondensation reaction, adding a condensation activator into the obtained polyamide acid solution, and uniformly blending to obtain the adhesive; wherein the functional group-containing diamine is composed of 50-80 mol% of amide diamine monomers and the balance of 2-(4-aminophenyl)-5-aminobenzimidazole in terms of molar percentage, the amide diamine monomers are 4,4'-diaminobenzanilide and / or N,N'-bis(4-aminophenyl)terephthalamide; and the activator is one or a combination of two or more selected from N,N'-carbonyldiimidazole, N,N'-thiocarbonyldiimidazole and diimidazolylbenzene. The adhesive is applied to a lithium battery positive / negative slurry to further manufacture a battery, and the battery has good battery characteristics.

The application discloses a preparation method of a pesticide lignosulfonate sodium dispersant composition and belongs to the technical field of dispersants. The method comprises the following steps: S1, taking papermaking black liquor as raw material, performing standing precipitation, flocculation precipitation, membrane concentration and acid precipitation treatment to obtain purified lignin; S2, adding the purified lignin into water, adjusting the pH of the system to 10-11, then adding hydrogen peroxide to perform pre-oxidation, then adding formaldehyde and sodium sulfite to perform sulfomethylation reaction, and adding formaldehyde to perform polycondensation reaction; cooling and discharging, and performing spray drying to obtain lignosulfonate sodium; and S3, adding the lignosulfonate sodium and 1-ethyl-3-methyl imidazolium L-lactate into water and stirring and uniformly mixing, adding stevioside to perform ultrasonic treatment, forming a homogeneous system, and performing spray drying to obtain the pesticide lignosulfonate sodium dispersant composition. The lignosulfonate sodium dispersant composition can effectively improve the pesticide dispersion stability and pesticide biological activity, and meets the pesticide use requirement.

The invention belongs to the technical field of high polymer materials, and particularly relates to polyamide acid resin, a polyimide film and a preparation method thereof, and the polyamide acid resin is obtained by condensation polymerization of a diamine monomer and a dianhydride monomer in a molar ratio of 1: (0.8-1.2) in a polar aprotic solvent; the diamine monomer and the dianhydride monomer comprise a first type of diamine compound with a hydrophobic group and / or a first type of dianhydride compound with a rigid ester ring structure, and a second type of diamine compound and a second type of dianhydride compound. The low-grade and low-water-absorption special monomer is introduced into the formula, the molecular chain structure is changed, the dielectric constant is reduced, and therefore the short-time ghost phenomenon is reduced.

The invention provides a filtrate reducer for a drilling fluid, a preparation method of the filtrate reducer and a synthetic oil-based drilling fluid. The preparation method comprises the following steps: S1, mixing a monomer, formaldehyde and water, and performing condensation polymerization under an alkaline condition to obtain a condensation polymer; wherein the monomer comprises humic acid, high-purity lignin and tannic acid in a mass ratio of (15-30): (7-12): (2-5); s2, mixing a quaternary ammonium salt surfactant and the condensation polymer, and reacting to obtain an intermediate product; s3, mixing the intermediate product and organic amine, and reacting to obtain a crude product; and performing post-treatment to obtain the filtrate reducer for the drilling fluid. The organic amine comprises one or a combination of more than two of C12-C18 aliphatic chain organic amine and C4-C10 polyamine. The filtrate reducer is environment-friendly and has a good filtrate reduction effect in a high-temperature environment.

This application relates to the field of lightweight building materials technology, and particularly to acid-activated foamed materials, their preparation methods, and components. The method for preparing acid-activated foamed materials includes: chemically reacting raw materials comprising active aluminosilicates, an acid activator solution, and a gas-generating component to obtain the acid-activated foamed material; wherein the acid activator solution contains phosphoric acid and / or acidic phosphates; the gas-generating component includes materials capable of reacting with the acid activator solution and releasing gas. This chemical reaction system includes an acid activation reaction and a gas-generating reaction. The acid activation reaction generates a phosphate-based polymer material through a dissolution-condensation reaction, exhibiting a certain strength. The gas-generating reaction and the acid activation reaction are coupled in terms of reaction sites and time, and the gas-generating process is also coupled with the process of increasing the viscosity of the reaction system. Therefore, the acid-activated foamed material has a uniform and stable pore structure and possesses advantages such as low density, thermal insulation, sound insulation, low energy consumption, fire resistance, and environmental friendliness.