1689 results about "Polycondensation reaction" patented technology

The invention discloses a yellow phosphorus tailing-based mine filling material and application thereof. The yellow phosphorus tailing-based mine filling material comprises aggregate and a cementing material, the cementing material comprises the following components in parts by mass: 5-20 parts of red mud, 20-40 parts of yellow phosphorus slag, 10-30 parts of slag, 5-10 parts of fly ash, 5-10 parts of a compound exciting agent, 1-3 parts of an early strength agent and 2-5 parts of a water-retaining agent; wherein the compound exciting agent comprises the following components in parts by mass: 10-20 parts of sodium metasilicate, 30-40 parts of gypsum powder, 20-30 parts of sodium sulfate, 5-10 parts of carbide slag and 5-10 parts of silica fume; according to the invention, the raw materials are compounded and the specific exciting agent is subjected to depolymerization-polycondensation reaction to obtain a cementing material containing Aft (ettringite), C-S-H gel (hydrated calcium silicate gel) and C-A-S-H gel (hydrated calcium aluminosilicate gel), and finally, the mine filling material with high fluidity, low bleeding rate and high strength is obtained while yellow phosphorus tailing solid waste is treated.

The invention discloses metal element-doped nano silicon carbon as well as a preparation method and application thereof, and relates to the field of negative electrode materials. The nano silicon carbon takes porous carbon as a carbon skeleton, and the porous carbon is sequentially attached with nano silicon and coated with a carbon material layer through a chemical vapor deposition method; the porous carbon is prepared by carbonizing resin containing metal nitride after alkali activation and pore forming, and the resin containing the metal nitride is prepared by condensation polymerization of a phenolic compound, an aldehyde compound and the metal nitride in the presence of a catalyst. The porous carbon is doped with the metal nitride in the resin polycondensation process, the conductivity of the nano silicon carbon is effectively improved, the powder resistance is reduced, holes in the surface of the porous carbon provide more expansion space for deposited nano silicon, a carbon material layer formed by subsequent deposition and coating provides a protection effect, the reaction between silicon and an electrolyte can be inhibited, and the service life of the nano silicon carbon is prolonged. A stable SEI film is formed, the cycling stability of the material is improved, the volume expansion rate of a pole piece is inhibited, and the cycling life and the stability of the battery are improved.

The invention relates to the technical field of multi-layer composite fabrics, and discloses a waterproof moisture-permeable composite fabric based on a bio-based material and a preparation method of the waterproof moisture-permeable composite fabric. The preparation method comprises the following steps: preparing an amino silanized zinc oxide / cellulose nanocrystal composite material, and carrying out mixed condensation polymerization on the amino silanized zinc oxide / cellulose nanocrystal composite material and vanillin cyclic carbonate to obtain an antibacterial agent; castor oil-based polyurethane, an antibacterial agent and a solvent are mixed and then subjected to electrostatic spinning, and after the electrostatic spinning and the pretreated polyester fabric are subjected to hot-pressing compounding, the obtained composite fabric has excellent waterproof and moisture permeable performance and good antibacterial performance.

The invention belongs to the technical field of flame-retardant macromolecules, and particularly relates to intrinsic heat-conducting flame-retardant recycled epoxy resin and a preparation method thereof. The preparation method comprises the following steps: (1) carrying out a reaction on diethanol amine and 9, 10-dihydro-9-oxa-10-phosphaphenanthrene 10-oxide (DOPO) to obtain an intermediate A; and (2) carrying out condensation polymerization on the intermediate A and phenylphosphonic acid to prepare the phosphate-terminated polyester flame retardant (PEF). And (3) carrying out epoxidation on 4, 4 '-biphenol to prepare the liquid crystal epoxy precursor LEP. And (4) mixing PEF, LEP and 3, 3 '-dithiodipropionic acid, and heating and curing to prepare the epoxy resin. The prepared epoxy resin has intrinsic heat conduction, flame retardance and efficient recoverability, and is a high polymer material with great potential.

The invention relates to the field of quantum dot ink, and discloses diffusion plate printing quantum dot ink and a preparation method thereof.The diffusion plate printing quantum dot ink comprises acrylic resin, hyperbranched polyester resin, a quantum dot material, modified boron nitride, a reactive diluent, a photoinitiator, a wetting agent and a defoaming agent; the hyperbranched polyester resin is prepared by reacting hyperbranched polyester acrylate and a sulfydryl-terminated silicon-containing reaction monomer, wherein the hyperbranched polyester acrylate is prepared by reacting pentaerythritol with 2, 2-dimethylolpropionic acid and then carrying out esterification reaction with acrylic acid; the sulfydryl-terminated silicon-containing reaction monomer is prepared by reacting eugenol with 1, 1, 3, 3-tetramethyldisiloxane and then carrying out esterification reaction with 3-mercaptopropionic acid; the modified boron nitride is prepared by modifying a cationic polymer which is prepared by carrying out a Mannich reaction on triethylene tetramine, formaldehyde and acetone and then carrying out a condensation polymerization reaction with formaldehyde. After the ink prepared by the invention is cured, a coating film is high in hardness, adhesive force and heat conductivity coefficient, and good in flexibility, heat resistance and migration barrier property.

The invention relates to the technical field of lithium battery negative electrode materials, and particularly discloses a resin-based self-activated porous carbon material and a preparation method and application thereof.The preparation method comprises the following steps that a diphenol monomer, a diphenol monomer containing thioether bonds, formaldehyde or polyaldehyde and a catalyst A are subjected to a condensation polymerization reaction, and phenolic resin is obtained; and carbonizing the phenolic resin to obtain the resin-based self-activated porous carbon material. The phenolic resin is synthesized by utilizing the diphenol monomer containing the thioether bond, so that a thioether alkane side chain is introduced into the phenolic resin, and in the carbonization process of the phenolic resin, because the thioether bond is extremely easy to decompose at high temperature to generate gas, a phenolic resin framework can be subjected to pore forming; the prepared resin-based self-activated porous carbon material has high specific surface area and pore volume, controllable design of the internal pore structure of the resin-based porous carbon can be realized by controlling the structure and modification proportion of the thioether alkane side chain, and ideal pore distribution is obtained.

The invention discloses an ionic liquid modified polyimide nanofiber film and an air purification filter screen based on the ionic liquid modified polyimide nanofiber film, and belongs to the technical field of film filtering materials. The preparation method comprises the following steps: firstly, selecting a diamine monomer and a dianhydride monomer to carry out low-temperature polycondensation reaction, and then carrying out solvent replacement and freeze drying to obtain polyamide acid powder; dissolving the powder to obtain a polyamide acid spinning solution, preparing an ionic liquid / polyamide acid spinning solution on the basis, and carrying out electrostatic spinning to obtain an ionic liquid / polyamide acid nanofiber membrane; and finally, carrying out high-temperature thermal imidization treatment to prepare the ionic liquid / polyimide nanofiber membrane. The method is simple and efficient, the problems of low resistance, high pressure drop and the like of a traditional nanofiber film in air filtration are solved, development and application of the nanofiber film in the field of air filtration are further widened, and the nanofiber film has important scientific significance and application value in the fields of high-temperature filtration, gas adsorption and the like.

The invention discloses a triazine biphenyl compound, a composition, a cured product as well as a preparation method and application of the triazine biphenyl compound, the composition and the cured product. The compound is phenolic resin with a triazine biphenyl structure obtained through condensation polymerization of p-cyanobiphenol; the phenolic resin respectively reacts with an epichlorohydrin compound and an acyl chloride compound to obtain epoxy resin and active ester with a triazine biphenyl structure, and the epoxy resin and the active ester can be self-cured or cured under the action of an imidazole accelerator; in the preparation process, triazine ring (containing nitrogen) is introduced as a node, trifunctional epoxy resin with a rigid aromatic structure as an arm and an active ester curing agent (the same skeleton) are prepared into a thermosetting cross-linked network by adopting a non-polar cross-linking scheme, and a three-dimensional network intrinsic microporous structure is formed through in-situ cross-linking regulation and control of a rigid long-arm branched unit. Further, the bottlenecks of low dielectric property, high temperature resistance, flame retardance and the like are broken through, and the cured material has the characteristics of excellent flame retardance, high temperature resistance and low dielectric property.

The invention provides bio-based nylon 12 and a preparation method thereof. The preparation method comprises the following steps: a) adding 12-amino dodecanoic acid inner salt, a catalyst, an antioxidant and a molecular weight regulator into a reaction kettle, filling inert shielding gas into the reaction kettle, and carrying out prepolymerization reaction to obtain a prepolymer; b) performing condensation polymerization on the prepolymer obtained in the step a) to obtain a condensation polymer; and c) sequentially carrying out melt blending, extrusion, cooling and granulation on the polycondensate obtained in the step b) to obtain the bio-based nylon 12. Compared with the prior art, the preparation method provided by the invention has the advantages that the bio-based nylon monomer 12-amino dodecanoic acid inner salt is adopted as a raw material and is matched with other raw material components, polymerization is carried out under specific process steps, overall better interaction is realized, and the prepared ultra-high molecular weight full bio-based nylon 12 is high in product molecular weight, free of coking and good in comprehensive performance.

Disclosed are a resin substrate-based iron oxyhydroxide desulfurizing agent and a preparation method therefor, falling within the technical field of gas purification and treatment. In the present disclosure, sodium percarbonate is used as a raw material to prepare iron oxyhydroxide. Sodium percarbonate serves both as an alkaline precipitant and as an oxidant. P-aminophenol and formaldehyde are subjected to condensation polymerization to form linear phenolic resin, which is then modified with terephthalyl alcohol to connect into a cross-linked network structure resin. The resin is used as a substrate to obtain the resin substrate-based iron oxyhydroxide desulfurizing agent. The preparation method of the present disclosure is simple and achieves a larger sulfur capacity and desulfurization efficiency, making it suitable for the removal of hydrogen sulfide from waste gas.

The invention relates to a phenolic aldehyde-sodium alginate composite carbon material with a three-dimensional network porous structure as well as a preparation method and application of the phenolic aldehyde-sodium alginate composite carbon material. Cheap phenol and formaldehyde are subjected to addition polycondensation, the addition polycondensation reaction time is controlled, phenolic resin is prepared, the phenolic resin and sodium alginate are mixed, a phenolic resin polymer can be uniformly dispersed in sodium alginate hydrogel, then a cross-linking agent solution is added, a semi-interpenetrating network structure is formed, and the cross-linked sodium alginate hydrogel is prepared. The preparation method has the advantages that the flexibility and the controllability are high, the obtained carbon material has high specific surface area, high specific capacitance and high cycle stability, and a new preparation thought and a new material choice are provided for preparing efficient and clean supercapacitors.

The invention discloses low-dielectric fluorine-containing silane modified polyimide and an application thereof. The structural formula of the low-dielectric fluorine-containing silane modified polyimide is # imgabs0 #; r1 is a fluorine-containing silane group; r2 is an aromatic anhydride group; aR is an aromatic group; and Ar'and Ar ''are one of phenoxy benzene groups or fluorine-containing biphenyl groups. The preparation method comprises the following steps: dissolving a hydroxyfluorene diamine compound, ether-containing polyamine and fluorine-containing polyamine in a polar organic solvent in an inert atmosphere, and then adding dianhydride and an end-capping reagent for condensation polymerization to obtain polyamide acid; the preparation method comprises the following steps: mixing polyamide acid, a water-carrying agent and fluorine-containing silane, and carrying out imidization reaction to obtain the low-dielectric fluorine-containing silane modified polyimide. The fluorine-containing silane polyimide prepared by the invention has a large-volume fluorenyl structure, flexible ether bonds, a silane structure and fluorine atoms with relatively high electronegativity, so that the prepared fluorine-containing silane polyimide has relatively low dielectric properties, and the processability of the polyimide and the solubility of the polyimide in various organic solvents are also improved.

The invention relates to the technical field of catalyst materials, in particular to an MOF-based polyester polycondensation catalyst and a preparation method and application thereof. The preparation method comprises the following steps: weighing MOF-5, adding into DMF (Dimethyl Formamide), and carrying out ultrasonic dispersion to obtain a suspension; weighing a titanium source, adding the titanium source into DMF, stirring and dissolving to obtain a titanium solution; and adding a titanium solution into the suspension liquid under stirring, stirring for 6-24 hours at the temperature of 60-120 DEG C and the speed of 300-1000 rpm, filtering, and drying the obtained solid product to obtain the Ti-MOF-5 polyester polycondensation catalyst. Ti < 4 + > is introduced into an MOF-5 framework, the Lewis acidity of the MOF-based polyester polycondensation catalyst is enhanced, Ti < 4 + > serving as a Lewis acid center can effectively activate ester groups and hydroxyl groups in a PET polycondensation reaction, so that reaction activation energy is reduced, the polycondensation reaction is accelerated, the Ti-MOF-5 catalyst has relatively low toxicity and relatively high biocompatibility, and compared with a traditional antimony catalyst, the Ti-MOF-5 catalyst has the advantages that the molecular weight of the Ti-MOF-5 catalyst is reduced, and the molecular weight of the Ti-MOF-5 catalyst is reduced. The Ti-MOF-5 not only can improve the reaction efficiency, but also meets the requirements of environmental protection and sustainable development.

A method for preparing a cationic dyeable flame-retardant high-strength polyester fiber is provided, after mixing oligomer A, oligomer B, and ethylene terephthalate and carrying out a polycondensation reaction to obtain a cationic dyeable flame-retardant polyester masterbatch, adding the cationic dyeable flame-retardant polyester masterbatch to the polyester chips according to a certain ratio for melt spinning, to prepare the cationic dyeable flame-retardant high-strength polyester fiber; oligomer A is prepared by the esterification reaction of a phosphorus flame retardant and a diol; oligomer B is prepared by the esterification reaction of sodium isophthalate sulfonate and a diol; the ratio of the sum of the molar weight of oligomer A and oligomer B to the molar weight of ethylene terephthalate is 3:7-6:4. The preparation method is simple, and the cationic dyeable flame-retardant high-strength polyester fiber has excellent mechanical properties, and can be used in automobiles, ships, and the interior decoration of high-class hotels.

The invention relates to the technical field of lithium battery positive pole pieces, in particular to a hyperbranched polyamide binder and a preparation method and application of a positive pole piece. The hyperbranched polyamide binder is a high-molecular polymer prepared from a diamine monomer, a polyamine monomer and a diacid monomer through a condensation polymerization reaction; the positive pole piece is obtained by mixing, pulping, coating and drying a positive pole material, a conductive agent and a binder; and the number-average molecular weight of the hyperbranched polyamide binder is 1.5 to 150 thousands. The positive pole piece comprises the hyperbranched polyamide binder disclosed by the invention. The positive pole piece is applied to the lithium battery. According to the hyperbranched polyamide binder, aliphatic raw materials are subjected to polycondensation, the cost of the raw materials is low, the process is simple, production is easy, and good economic benefits are achieved; the pole piece is good in flexibility, thick coating is not prone to cracking, and slurry is good in stability and easy to process; the battery is high in energy density and long in cycle life and has a relatively good application prospect.

The invention discloses silicon-based synthetic leather and a preparation method thereof. The synthetic leather comprises base cloth, a silicone rubber layer and a surface treatment layer, wherein the surface treatment layer comprises vinyl-terminated polysiloxane, hydrogen-containing polysiloxane, a reaction inhibitor, a platinum catalyst, silicon dioxide microspheres, hyperbranched vinyl polyurethane and cyclic siloxane; the molar ratio of vinyl in the vinyl-terminated polysiloxane to silicon hydrogen in the vinyl-terminated polysiloxane is 1: (1.05-1.12), and the hyperbranched vinyl polyurethane is prepared by carrying out condensation polymerization on polyol acrylate and isocyanate in the presence of a catalyst and then carrying out end-capping reaction with a vinyl end-capping agent. The formula of the surface treatment layer is optimized, the molar ratio of vinyl to silicon hydrogen is 1: (1.05-1.12), dense vinyl of hyperbranched vinyl polyurethane (HVPUA) reacts with residual Si-H, interface bonding is enhanced by combining amino silane grafting, and silicone oil precipitation is reduced synergistically.

The preparation method comprises the following steps: 1, completing an esterification reaction of terephthalic acid and ethylene glycol in an esterification reaction kettle according to a semi-continuous polyester synthesis process, and ensuring that the esterification rate is not lower than 96% by controlling the water yield; 2, introducing the fully esterified intermediate high-temperature solution into a secondary esterification kettle, uniformly adding quantitative self-prepared spherical coated silicon dioxide additive suspension, controlling the temperature, and continuously stirring and dispersing for not less than 30 minutes; and 3, heating the uniform slurry in the secondary esterification reaction kettle to a certain temperature, introducing the slurry into a polycondensation reaction kettle after passing through a melt filter of 15-25 microns, completing a polymerization reaction in the polycondensation reaction kettle by controlling parameters such as temperature, pressure and stirring rate, and synthesizing a polyester chip melt capable of producing the low-scratch release protective film, and pelletizing the polyester chips by using an underwater pelletizing system, drying and sub-packaging to obtain the target modified polyester chips.

A high-strength PA6 composite material and a preparation method therefor, the PA6 composite material comprising, in parts by mass, 80-95 parts of caprolactam, 1-3 parts of benzoic acid and 10-30 parts of a modification additive. The benzoic acid is used for improving the tensile strength of the composite material, and the modification additive is used for enhancing the impact resistance of the composite material. Terephthalic acid and m-xylylenediamine undergo a reaction to generate m-xylylenediamine terephthalate, which is then subjected to a polycondensation reaction with caprolactam, so as to introduce same into the backbone of a PA6 molecule and modify the PA6 resin. The modified PA6 resin has remarkably improved tensile strength and impact resistance, so that the application range of the PA6 composite material can be greatly expanded.

The invention is suitable for the technical field of chemical industry, and provides a method for preparing polycarbonate diol by using a titanate catalyst, which comprises the following steps: step 1, transesterification: mixing dimethyl carbonate and 1, 6-hexanediol according to a molar ratio of 1.1-1.5: 1, adding isopropyl titanate which accounts for 0.01-2% of the total raw material amount as a catalyst, and reacting at the temperature of 50-60 DEG C for 1-3 hours; carrying out transesterification on the mixture; step 2, carrying out condensation polymerization to obtain a polycarbonate diol crude product; and step 3, carrying out reduced pressure purification, and removing the small molecular polymer and the residual titanium isopropoxide catalyst to obtain the high-purity polycarbonate diol. According to the present invention, the efficient titanium isopropoxide catalyst is used under the normal pressure, such that the preparation of the high-purity and narrow-molecular-weight-distribution polycarbonate diol is achieved, the operation condition is mild, the production efficiency is high, the cost is low, and the catalyst has characteristics of low boiling point, easy removal and environmental protection.

The invention relates to the technical field of marine antifouling materials, in particular to a modified polyurethane marine antifouling coating based on a metal pyridine structure and a preparation method. According to the modified polyurethane marine antifouling paint based on the metal pyridine structure, polyhydric alcohols and diisocyanate monomers with different molecular weights are subjected to condensation polymerization to obtain a polyurethane prepolymer; then reacting a diaminopyridine monomer or a dihydroxypyridine monomer with a metal ion compound to obtain a chain extender with a metal pyridine structure; finally, the marine antifouling paint is prepared through the reaction between the terminal amino or hydroxyl of the metal pyridine structure chain extender and the terminal isocyanate group of the polyurethane prepolymer, the metal pyridine structure is introduced into polyurethane, the mechanical performance of the marine antifouling paint is enhanced, the marine antifouling paint is endowed with the antibacterial effect through metal ion release, and the service life of the marine antifouling paint is prolonged. Adhesion and growth of marine fouling organisms can be effectively inhibited, and an efficient and durable solution is provided for development of a polyurethane marine antifouling coating.

The invention belongs to the technical field of carbon neutralization, and discloses an organic solid waste pyrolysis gasification tar hydrocarbon co-production quality-divided utilization method, which comprises the following steps of: firstly, dividing tar generated in an organic solid waste pyrolysis gasification process into light tar, medium tar and heavy tar according to boiling range difference through in-situ thermal-state quality division; the light tar is subjected to catalytic steam reforming to obtain hydrogen-rich synthesis gas, the medium tar is subjected to steam reforming to obtain synthesis gas and semicoke generated by condensation polymerization, and the semicoke and the heavy tar are subjected to steam activation to obtain synthesis gas and porous carbon; and carrying out water-gas shift, CO2 capture and pressure swing adsorption purification treatment on the obtained synthesis gas to obtain battery-grade hydrogen. According to the method, the tar is converted into high-value porous carbon and high-purity hydrogen step by step through stage treatment and quality-divided utilization of the tar, so that the problems of rapid deactivation of a catalyst, waste of high-temperature energy and the like in the tar treatment process are effectively solved, and resource utilization of the tar is realized.

The invention belongs to the technical field of chemical production, and particularly relates to a channelized continuous synthesis method of polyvinyl siloxane microspheres and a used device. The continuous channelization device comprises a channelization reactor I and a channelization reactor II, the channelization reactor I and the channelization reactor II are both multi-side-line feeding tubular reactors. The invention also provides a channelized continuous synthesis method of the polyvinyl siloxane microspheres. The method comprises the following steps: carrying out hydrolysis reaction on vinyltrimethoxysilane and a hydrochloric acid solution in a channelized reactor I; primary reaction liquid flowing out of the channelization reactor I and aqueous alkali are subjected to condensation polymerization in a channelization reactor II; the ultimate reaction liquid flowing out of the channelization reactor II enters a collecting tank and is subjected to post-treatment, and the polyvinyl siloxane microspheres are obtained.

The invention discloses a superconducting carbon black co-production method based on directional refining of catalytic slurry oil and a product thereof, and belongs to the technical field of carbon black preparation, and the method comprises the following steps: mixing the catalytic slurry oil and catalytic circulating oil to obtain mixed slurry oil, and adding a deliming agent for settling separation to obtain purified slurry oil; carrying out continuous solvent extraction on the obtained purified oil slurry to respectively obtain an aromatic component and a heavy component; carrying out thermal polycondensation reaction on the obtained aromatic component in a magnetic field environment in the presence of a catalyst and a cross-linking agent, and then carrying out supercritical fluid extraction to obtain spinnable mesophase pitch; carrying out slurry reactor hydrogenation deconstruction on the obtained heavy component to obtain stable micromolecular carbon black raw oil, mixing the carbon black raw oil with a nitrogen source and a template precursor, carbonizing, and carrying out acid pickling to obtain the superconducting carbon black; through a heavy oil slurry reactor hydrogenation deconstruction'doping-template 'synergistic carbonization strategy, the superconductive carbon black with nitrogen / phosphorus co-doped and developed hierarchical porous structure is constructed in situ by a one-step method.

The invention relates to the technical field of polymers, and discloses a polymethoxy-terminated structured assistant, a preparation method and high-transparency silicone rubber, the structured assistant comprises the following raw materials: methyltrimethoxysilane, a solvent, a silane coupling agent, a reactant and a terminator, the structured auxiliary agent is prepared from methyltrimethoxysilane as a main raw material through hydrolytic polycondensation reaction, the viscosity of the structured auxiliary agent is 2-20 cst, the structured auxiliary agent is not easy to volatilize, the flammable and explosive risk is low, the safety is high, the structured auxiliary agent is terminated by polymethoxy groups, the content is large, the activity is high, the surface of the white carbon black can be effectively modified, the dispersity of the white carbon black is improved, and the service life of the white carbon black is prolonged. The product obtained after the reaction of the structured auxiliary agent and white carbon black is methanol which is easy to remove, and the transparency of the silicone rubber can be remarkably improved.

The production equipment comprises a slurry tank, an esterification reactor, a multi-stage polycondensation tower and an esterification separation tower which are sequentially connected, the esterification separation tower is further circularly connected with the esterification reactor, the slurry tank is used for feeding alcohol and acid, the esterification reactor is used for carrying out esterification reaction, and the multi-stage polycondensation tower is connected with the esterification separation tower. The multi-stage polycondensation tower comprises multi-stage tower sections, the pressure of the multi-stage tower sections is gradually reduced from the feeding end to the discharging end, the multi-stage polycondensation tower is used for carrying out polycondensation reaction on esterification materials from the esterification reactor, polycondensation products generated by the multi-stage polycondensation tower are discharged, and the esterification separation tower is used for separating water, alcohol and small molecular substances in polycondensation condensate; and alcohol separated by the esterification separation tower flows back to the esterification reactor. The device can be used for continuous production of low-molecular-weight polyester, and can reduce equipment investment and separation energy consumption and reduce energy consumption and cost while improving efficiency and yield.

The invention discloses a bending-resistant and low-dielectric transparent polyimide film for a flexible electronic device as well as a preparation method and application of the bending-resistant and low-dielectric transparent polyimide film. The surfaces of glass beads are subjected to grafting modification treatment by adopting alkali liquor and a coupling agent; performing ultrasonic dispersion to uniformly disperse the grafted and modified glass beads in a solvent; the preparation method comprises the following steps: dissolving a fluorine-containing diamine monomer in a solvent containing graft modified glass beads under a nitrogen protection atmosphere, after the fluorine-containing diamine monomer is completely dissolved, slowly adding a fluorine-containing dianhydride monomer in batches under a continuous stirring condition, and preparing a transparent polyamide acid solution containing glass beads through a condensation polymerization reaction; and uniformly coating the polyamide acid solution containing the glass beads on a glass substrate through a blade coating machine, and then carrying out gradient heating to obtain the glass bead compounded transparent polyimide film. Fluorine atoms are introduced into molecular structures of dianhydride and diamine, and grafting modified glass beads are doped to serve as filler, so that the transparent polyimide film with bending resistance and low dielectric constant characteristics is successfully prepared.

The present invention provides a system and a method for preparing a polyester polyol prepolymer. The system comprises an atmospheric pressure bubbling reaction rectifying tower and a reduced pressure heating reaction rectifying tower. The method comprises: introducing a protective gas into an atmospheric pressure bubbling reaction rectifying tower, introducing a raw material for preparing a polyester polyol prepolymer into the atmospheric pressure bubbling reaction rectifying tower, and carrying out a primary esterification reaction or an ester exchange reaction; and introducing the primary esterification product or the ester exchange product into a reduced pressure heating reaction rectifying tower, and carrying out one or more of a deep esterification reaction, an ester exchange reaction, and a pre-polycondensation reaction to obtain the polyester polyol prepolymer. The present invention has the advantages of high reaction efficiency, stable product quality, easiness in product separation, convenience in large-scale production and the like.

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.

The invention provides a synthesis method of bio-based poly (ethylene 2, 5-furandicarboxylate) (poly (ethylene 2, 5-furandicarboxylate) for short) and performance application of the bio-based poly (ethylene 2, 5-furandicarboxylate). According to the method, 2, 5-furandicarboxylic acid (FDCA) derived from renewable resources and ethylene glycol (EG) are used as main raw materials, and the high-molecular-weight PEF is prepared through microwave-assisted esterification-polycondensation reaction under the action of a metal catalyst. The prepared PEF has excellent thermal mechanical property and gas barrier property, the glass transition temperature is about 58.6 DEG C, the melting temperature is about 187.4 DEG C, and the thermal decomposition 18% weight loss temperature exceeds 400 DEG C. The PEF material can be biologically degraded under the industrial composting condition, and the degradation speed is higher compared with that of traditional petroleum-based PET polyester. The PEF provided by the invention is suitable for the fields of food packaging films, beverage bottles and fiber materials, has the advantages of biodegradability, heat resistance stability and high barrier property, can partially replace polyethylene glycol terephthalate (PET) and other petrochemical plastics, and meets the requirements of sustainable development.

The invention provides an aromatic polyoxadiazole film and a preparation method and application thereof.The preparation method of the aromatic polyoxadiazole film comprises the following steps that fuming sulfuric acid serves as a solvent and a dehydrating agent, terephthalic acid and hydrazine sulfate serve as monomers, benzoic acid serves as a chain end-capping agent, step-by-step feeding is adopted, and three-stage condensation polymerization is conducted to obtain the aromatic polyoxadiazole film. An aromatic polyoxadiazole resin solution is obtained; pressurizing, orienting and conveying to a forming die head, extruding to obtain an acid-containing primary cast film, and solidifying and forming in a single-stage coagulating bath to obtain a polyoxadiazole wet film; washing the acid-free polyoxadiazole wet film to obtain an acid-free polyoxadiazole wet film; then biaxial stretching is conducted, heat setting treatment is conducted, and the aromatic polyoxadiazole film is obtained. After the aromatic polyoxadiazole film prepared by the method is carbonized and graphitized, the problem of'powder falling 'is avoided, and the prepared super-crystal graphite film is flat and uniform in appearance, more complete in crystal structure, higher in heat-conducting property, free of pollution to electronic elements and good in application prospect.