37 results about "Bisphenol Z" patented technology

The invention discloses a quick-curing polyurethane seamless expansion joint material for roads and a preparation method, and belongs to the technical field of road engineering materials. The material is prepared from polyether polyol, polycaprolactone glycol, a bisphenol A epoxy-polyether block isocyanate terminated prepolymer, a methyl phenyl silicon-boron hybrid hydroxyl chain extender, diphenylmethane diisocyanate, calcium carbonate, wollastonite, a hindered amine anti-aging agent and dioctyl phthalate. Wherein the bisphenol A epoxy-polyether block isocyanate terminated prepolymer is prepared by the following steps: reacting bisphenol A with epoxy chloropropane to generate epoxy resin, reacting with polytetramethylene ether glycol, and introducing isophorone diisocyanate; the methyl phenyl silicon-boron hybrid hydroxyl chain extender is prepared by carrying out hydrosilylation and ethylene glycol reaction on methyl trimethoxy silane, 3-glycidyl ether oxypropyl trimethoxy silane and allylboronic acid pinacol ester; and the methyl phenyl silicon-boron hybrid hydroxyl chain extender is prepared by carrying out hydrosilylation on methyl trimethoxy silane, 3-glycidyl ether oxypropyl trimethoxy silane and allylboronic acid pinacol ester. The material has the advantages of quick curing property, weather resistance and high-temperature stability, and is suitable for road seamless expansion joint scenes.

The invention provides a polymer and a preparation method and application thereof, the preparation method comprises the following steps: 1, mixing dopa and / or dopamine with an organic solvent, and adding an organic alkali and a silane compound to obtain a first intermediate product; 2, mixing the first intermediate product with an organic solvent, adding a pH regulator, and carrying out a stirring reaction to obtain a second intermediate product; 3, mixing a diphenyl sulfone compound with an organic solvent, adding the second intermediate product, and stirring for reaction to obtain a third intermediate product; 4, mixing the third intermediate product with an organic solvent, and adding ammonium salt to obtain a fourth intermediate product; and 5, mixing the fourth intermediate product, bisphenol A and an organic solvent, adding an inorganic base, and carrying out a stirring reaction to obtain the polymer. When the polymer is used for preparing the alkaline water electrolysis composite membrane, the wettability of the composite membrane and electrolyte can be improved, the surface resistance of a diaphragm is reduced, and the electrolytic efficiency and mechanical stability of the diaphragm are improved.

The invention provides hydrogenated bisphenol A epoxy resin and a preparation method thereof, and belongs to the technical field of epoxy resin preparation, the preparation method comprises the following steps: (1) dissolving hydrogenated bisphenol A in a solvent, heating, and carrying out reflux dehydration; (2) mixing the hydrogenated bisphenol A subjected to reflux dehydration with a catalyst, and then adding epoxy chloropropane for etherification ring-opening reaction to obtain chlorohydrin ether; (3) adding an alcohol auxiliary agent, then adding alkali, and carrying out closed-loop epoxidation reaction; (4) supplementing a solvent and water, stirring, standing for layering, removing lower-layer saline water, and taking an upper-layer organic layer; and (5) post-processing to obtain the hydrogenated bisphenol A epoxy resin. According to the method disclosed by the invention, by adding the alcohol auxiliary agent, the closed-loop epoxidation reaction can be thorough by adding alkali under normal pressure, the effect of the closed-loop epoxidation reaction can be remarkably improved, a phase transfer catalyst does not need to be added in the reaction process, and decompression reflux dehydration is also not needed, so that reaction equipment and operation are greatly simplified.

The invention relates to the technical field of high-molecular polymers and surface chemical modification thereof, in particular to a low-dielectric-constant polyaryletherketone material and a preparation method thereof, and a flexible copper foil laminated structure and a preparation method thereof. The low-dielectric-constant polyaryletherketone material is obtained by taking a bisphenol monomer and difluorobenzophenone as reaction monomers and carrying out aromatic nucleophilic polycondensation reaction; wherein the bisphenol monomer is selected from a combination of C3-C8 normal or isomeric alkyl substituted hydroquinone and bisphenol containing at least one aryl group; the bisphenol containing at least one aryl group is selected from one or more of bisphenol AP, bisphenol BP, bisphenol Z and bisphenol fluorene; the low-dielectric-constant polyaryletherketone material forms a thin film, the surfactant treatment layer and the grafting layer are sequentially formed on the thin film, then the thin film is compounded with the copper foil, and the formed flexible copper foil laminated structure has high peel strength and low dielectric constant.

The invention relates to a process for preparing an alkoxylated product. The aim of the invention is to provide aromatic polyols for preparing polyurethane-based and polyisocyanurate-based polymers, which ensure good miscibility with the isocyanate component and other components, have a good storage stability and render the end product flameproof. For this purpose, the invention devises a process for preparing an alkoxylated product by reacting bisphenol F with propylene carbonate and / or propylene oxide as propoxylation agent and ethylene carbonate and / or ethylene oxide as ethoxylation agent, the propoxylation agent and the ethoxylation agent being used in a molar ration of 70:30 to 45:55.

The invention provides high-temperature-resistant TPU (thermoplastic polyurethane) resin as well as a preparation method and application thereof. The high-temperature-resistant TPU resin is prepared from the following raw materials: A-type polyester polyol, B-type polyester polyol, diisocyanate, a chain extender and ceramic powder, the A-type polyester polyol comprises at least one of poly (butylene adipate) glycol, poly (butylene adipate) glycol, polycaprolactone polyol and polycarbonate polyol, and the B-type polyester polyol is polyester polyol obtained by carrying out polycondensation on bisphenol A and aliphatic dibasic acid with the carbon atom number being more than 8. The TPU resin not only has good tensile strength and elongation at break, but also has good high temperature resistance, the retention rate of tensile strength can reach 80% or above after 168 hours at 135 DEG C, and the TPU resin can be applied to the fields of high-temperature cable sheaths and the like.

The present invention relates to the application of a catalyst in the reaction of catalytic synthesis of bio-based polycarbonate. In the present invention, isosorbide is used to replace bisphenol A to prepare bio-based polycarbonate with organic carbonate. On the one hand, renewable biomass raw materials are utilized, realizing the green chemistry concept of sustainable development. On the other hand, the toxicity problem of bisphenol A polycarbonate in the field of plastic products for many years is also solved. The method for preparing the bio-based polycarbonate in the present invention is simple and easy to operate. The raw materials are derived from biomass and have a high utilization rate. The obtained bio-based polycarbonate is a brown solid and non-toxic. Its thermal properties are similar to those of bisphenol A polycarbonate, and the weight-average molecular weight can reach 5×10<supgt;5< / supgt>.

The invention belongs to the field of high polymer materials, and relates to a clean construction method of a halogen-free phosphorus-free flame-retardant epoxy polymerization system. The preparation method comprises the following steps: preparing an intermediate I from 2, 2 '-diallyl bisphenol and allyl bromide under the action of potassium carbonate; carrying out rearrangement reaction on the intermediate I to prepare an intermediate II; and carrying out etherification and ring-closure reaction on the intermediate II and epoxy chloropropane under the action of a catalyst and sodium hydroxide to obtain the epoxy resin monomer III. The halogen-free phosphorus-free flame-retardant epoxy resin polymer is obtained by mixing an epoxy resin monomer with a curing agent, melting, performing injection molding and curing. The halogen-free and phosphorus-free flame retardant polymer obtained by the invention can reach the flame retardant grade of UL94-V0 grade.

According to the present invention, it is possible to provide a resin composition containing a lithium salt and a polycarbonate resin containing a structural unit (A) derived from at least one component selected from the group consisting of bisphenol A, bisphenol C, bisphenol MIBK, bisphenol BPAF, bisphenol Z, and bisphenol AP represented by the following structural formulae, the terminal structure of the polycarbonate resin contains a terminal structure derived from a polyalkylene glycol monoalkyl ether represented by general formula (1). (In general formula (1), R1 represents an alkylene group having 2-20 carbon atoms, R2 represents an alkyl group having 1-20 carbon atoms, and n represents an integer of 3-120. > # imgabs0 #

The present invention discloses a conductive microsphere for an anisotropic conductive film and a preparation method thereof, belonging to the technical field of conductive microspheres. The conductive microsphere for the anisotropic conductive film comprises the following raw materials in parts by weight: 80-100 parts of styrene, 0.5-1.5 parts of an initiator, 6-8 parts of a modified crosslinking agent, 2-8 parts of a dispersant, 10-12 parts of carbon nanotubes, 15-20 parts of graphene, 80 parts of deionized water, and 800 parts of toluene; in the present invention, intermediate 1 is synthesized by reacting 2,2'-diallyl bisphenol A with epichlorohydrin, and the modified crosslinking agent is prepared by reacting intermediate 1 with γ-aminopropyltriethoxysilane. The conductive microsphere for the anisotropic conductive film prepared by the present invention has good electrical conductivity and hardness.

The invention provides a preparation method of propoxylated bisphenol A, and belongs to the field of propoxylated bisphenol A production. The method comprises the following steps: stirring and mixing bisphenol A and an alkaline aqueous solution to obtain a pre-structured system; dropwise adding epoxypropane into the pre-structured system, and carrying out a heat preservation reaction to obtain a reaction mixture; adding a water-saturated benzene solvent into the reaction mixture, and removing a lower-layer water phase to obtain an upper-layer benzene solution; under the protection of inert gas, removing the benzene solvent in the upper benzene solution to obtain an intermediate product; dissolving the intermediate product by using a ketone solvent, then adding a core-shell structure adsorbent for adsorption treatment, and removing a lower solid phase to obtain a supernatant; and removing the ketone solvent in the supernatant liquid to obtain the propoxylated bisphenol A. According to the application, the improvement of the structure regularity and the purity of the propoxylated bisphenol A is realized at the same time through the collaborative design of'ensuring the structure regularity by directionally regulating and controlling the reaction process' and'improving the purity by stepped precise impurity removal '.

The application provides a new method for degrading bisphenol A in water. A copper-loaded CHA type molecular sieve (Cu x SSZ-13, and x is the content of Cu) is used to activate hydrogen peroxide process to realize efficient oxidative degradation of bisphenol A in water. Compared with the traditional H2O2 / Fe(II) system for oxidatively degrading bisphenol A, the utilization rate of the oxidant is greatly improved, the required amounts of the oxidant and the catalyst are greatly reduced, the catalyst can be reused, and the method has great advantages in improving the degradation efficiency of bisphenol A and widening the pH range.

The invention discloses a preparation method of diallyl bisphenol A diglycidyl ether, and relates to the technical field of epoxy resin materials, and the preparation method comprises the following steps: S1, primary reaction: respectively weighing diallyl bisphenol A and epoxy chloropropane by using a precise electronic scale, and placing the weighed diallyl bisphenol A and epoxy chloropropane in a four-neck flask; according to the preparation method of the diallyl bisphenol A diglycidyl ether, diallyl bisphenol A and epichlorohydrin are subjected to epoxidation reaction under an alkali condition, epichlorohydrin is taken as a solvent, a one-step process is adopted, and the diallyl bisphenol A diglycidyl ether is prepared by controlling the reaction temperature and the reaction time, adjusting the alkali amount and the alkali adding mode, carrying out reduced pressure reflux with water and the like. The diallyl bisphenol A diglycidyl ether with low hydrolyzable chlorine, low total chlorine and high yield is obtained, compared with common bisphenol A epoxy resin, an allyl structure is introduced to a benzene ring, active functional groups in a molecular chain are increased, and the application field of the epoxy resin is expanded.

The invention discloses a flexible hydroxyl bisphenol A glycidyl ether epoxy compound as shown in a formula i, a preparation method thereof and application of the flexible hydroxyl bisphenol A glycidyl ether epoxy compound as a polyurethane optical material modifier. The preparation method comprises the following steps: (1) single-side epoxidation reaction: carrying out epoxidation reaction on bisphenol A and epoxy chloropropane under an alkaline condition to obtain bisphenol A monoglycidyl ether; (2) flexible chain introduction reaction: bisphenol A monoglycidyl ether and diethylene glycol are subjected to protonation activation under acid catalysis, phenolic hydroxyl attacks protonated carbon atoms to form ether bonds, the ether bonds preferentially react with one end of diethylene glycol, and finally the flexible hydroxyl bisphenol A glycidyl ether epoxy compound (formula i) is obtained. The modified polyurethane resin can be used as a modified material of a polyurethane optical resin material, improves toughness, enhances interface interaction, reduces curing stress, avoids element failure caused by stress concentration and is used for pouring, assembling and the like of precise optical components through structural optimization designs such as super-flexible chain segment increase, terminal hydroxylation and gradient epoxy distribution. (i)

The present invention discloses a self-crosslinking ultrafiltration membrane, which comprises: an active monomer mixture, and the active monomer mixture reacts with 4, 4 '-dichlorodiphenyl sulfone to obtain a self-crosslinking pre-crosslinking transition layer; the pre-crosslinking transition layer forms an asymmetric structure layer on the surface of the non-woven fabric through a non-solvent phase inversion process; and immersing the asymmetric structure layer into a phosphorus pentoxide / methanesulfonic acid mixed solution, and carrying out a cross-linking reaction to obtain the cross-linked polysulfone ultrafiltration membrane containing the phenyl sulfone group. Wherein the active monomer mixture is formed by mixing side phenyl bisphenol A, sulfonated bisphenol A and bisphenol A according to a certain proportion. The invention also discloses a preparation method of the self-crosslinking ultrafiltration membrane. Through molecular structure design, the swelling effect caused by solvent permeation is inhibited, the original mechanical strength and thermal stability of the material are maintained, meanwhile, the chemical stability of the material in an organic solvent environment is remarkably improved, the service life of the membrane is prolonged, and the reliability of separation performance is ensured.

The invention discloses a synthesis method of hexafluorodianhydride, which belongs to the field of chemical synthesis, and specifically comprises the following steps: (1) bisphenol AF and an alkaline substance react under a heating condition; then carrying out Kolbe-Schmitt reaction on the reaction product I and carbon dioxide at high temperature and high pressure, and acidifying by adopting inorganic acid to obtain an intermediate I; (2) dissolving the intermediate I in a reaction solvent, adding inorganic alkali, transferring into a nitrogen atmosphere, adding a nickel catalyst, a ligand and metal manganese, transferring into a carbon dioxide atmosphere, carrying out carboxylation reaction, and sequentially quenching, extracting, drying, filtering and carrying out reduced pressure distillation on a reaction product II to obtain an intermediate II; and (3) carrying out heating reflux on the intermediate II and acetic anhydride, and carrying out a dehydration reaction to obtain hexafluorodianhydride. Through the limited three-step synthesis method, the synthesis route is simplified, the synthesis time is shortened, a large amount of waste generated in the synthesis process is avoided, and the yield of hexafluorodianhydride is also improved.

The invention provides a preparation method of octabromoS ether, and belongs to the technical field of flame-retardant materials. According to the preparation method, bisphenol S and allyl bromide are subjected to a carbon-oxygen coupling reaction under catalysis of a transition metal compound catalyst, bisphenol S diallyl ether and hydrogen bromide are obtained, hydrogen bromide can be recycled in a subsequent addition reaction, and the cost is saved; then hydrobromic acid and bisphenol S diallyl ether are subjected to an addition-electrophilic substitution reaction under catalytic oxidation of hydrogen peroxide to obtain octabromo-S ether, and high-toxicity bromine is not adopted; hydrogen peroxide is reduced into water in the reaction, so that the method is green and environment-friendly.

The invention relates to a process for preparing an alkoxylated product. The aim of the invention is to provide aromatic polyols for preparing polyurethane-based and polyisocyanurate-based polymers, which ensure good miscibility with the isocyanate component and other components, have a good storage stability and render the end product flameproof. For this purpose, the invention devises a process for preparing an alkoxylated product by. reacting bisphenol F with propylene carbonate and / or propylene oxide as propoxylation agent and ethylene carbonate and / or ethylene oxide as ethoxylation agent, the propoxylation agent and the ethoxylation agent being used in a molar ration of 70:30 to 45:55.

The application provides a preparation method of propoxylated bisphenol A, and belongs to the field of production of propoxylated bisphenol A. The method comprises the following steps: stirring and mixing bisphenol A and an alkaline aqueous solution to obtain a pre-structured system; adding propylene oxide dropwise to the pre-structured system and performing heat preservation reaction to obtain a reaction mixture; adding a water-saturated benzene solvent to the reaction mixture, removing a lower aqueous phase, and obtaining an upper benzene solution; removing the benzene solvent in the upper benzene solution under the protection of an inert gas to obtain an intermediate product; dissolving the intermediate product in a ketone solvent, then adding a core-shell structure adsorbent for adsorption treatment, removing a lower solid phase, and obtaining an upper clear liquid; removing the ketone solvent in the upper clear liquid to obtain propoxylated bisphenol A. The application simultaneously realizes the improvement of the structural regularity and the purity of propoxylated bisphenol A through the synergistic design of "directional regulation of the reaction process to guarantee the structural regularity" and "ladder type precise impurity removal to improve the purity".

This invention belongs to the field of polymer materials, specifically relating to a method for preparing polycarbonate using a non-phosgene melt transesterification method, and the resulting polycarbonate. The invention involves mixing bisphenol A and diphenyl carbonate at an optimized molar ratio, followed by a transesterification reaction to obtain oligomers. The oligomers are then subjected to a pre-condensation reaction under optimized temperature and pressure, with the residence time controlled to achieve an ideal intrinsic viscosity window. The prepolymer is then subjected to a first and final condensation reaction sequentially to obtain polycarbonate. This invention, through the coordinated control of temperature, pressure, and feed molar ratio during the pre-condensation stage, stabilizes the intrinsic viscosity of the prepolymer within the ideal window, laying a high-quality feed foundation for subsequent condensation polymerization. This significantly improves the impact strength and performance stability of the product, while effectively reducing diphenyl carbonate loss and controlling the end-hydroxyl content of the product. This provides a complete method for the preparation of high-performance polycarbonate.

The invention relates to a hydrogenated bisphenol A epoxy resin type colorless transparent adhesive and a preparation method thereof. The preparation method comprises the following steps: (1) under the catalytic action, hydrogenated bisphenol A and epoxy chloropropane are subjected to a ring-opening reaction, then a strong base aqueous solution is added for a ring-closing reaction, and hydrogenated bisphenol A epoxy resin is obtained; and (2) mixing the hydrogenated bisphenol A epoxy resin, the epoxy flexibilizer and the curing agent, and uniformly stirring at room temperature to obtain the epoxy resin. The product disclosed by the invention has excellent optical transparency, ultraviolet resistance and yellowing resistance, excellent low-temperature adhesive property and room-temperature impact resistance, and can be widely applied to the high-tech fields such as optical instruments, 3D printing, ornaments, artificial glass, resin lenses, outdoor equipment, aerospace, automobile industry, construction and building materials, electronic displays and the like; good industrialization prospects are realized.

The invention discloses bismaleimide blended resin as well as a synthesis method and application thereof. And the blended resin is a blended resin of diallyl bisphenol A (DABPA) and bismaleimide. The invention further discloses a preparation method of the resin. The cured resin of the blended resin has the characteristic of high elastic modulus, is suitable for being used as a high-performance composite material resin matrix, and has certain application value in the fields of military industry, aerospace, electronics and the like.

This invention relates to the fields of organic synthesis and polymer materials, and discloses a method for synthesizing high-viscosity bisphenol F type epoxy resin for the electronic and electrical fields. The method includes: using bisphenol F (BPF) and epichlorohydrin (ECH) as raw materials, and preparing high-viscosity bisphenol F epoxy resin under catalytic and alkaline conditions through ring-opening addition, ring-closing polycondensation, dechlorination purification, and molecular chain regulation. By controlling the molar ratio, reaction temperature, residence time, and dechlorination efficiency, the molecular weight distribution and viscosity can be precisely adjusted, achieving a stable high viscosity range of 8000–30000 mPa·s (25℃), with hydrolyzed chlorine ≤100ppm and inorganic chlorine ≤5ppm. This invention employs a two-step method (chain growth method): first synthesizing a low molecular weight liquid resin, and then extending the chain with bisphenol F to increase viscosity. It includes a continuous green process: using nitrogen protection, waste heat recovery, by-product recycling, and multi-stage water washing and desalination, which effectively reduces energy consumption and waste, and improves production efficiency and product stability.

The invention provides a method for preparing low-viscosity bisphenol A epoxy resin, and relates to the field of high polymer material preparation. The method comprises the step of reacting bisphenol A with epoxy chloropropane in the presence of a palladium compound modified quaternary ammonium salt catalyst to prepare the bisphenol A epoxy resin. The palladium compound modified quaternary ammonium salt catalyst has the effect of enabling epoxy chloropropane to be subjected to effective ring opening, the ring opening rate can be increased, the use amount of epoxy chloropropane is reduced, and due to the fact that the ring opening rate is increased, low-molecular-weight and low-viscosity epoxy resin can be synthesized more easily. Meanwhile, other comprehensive properties (mechanical properties and heat resistance) are not obviously reduced. The method disclosed by the invention has the characteristics of high reaction efficiency and excellent comprehensive performance of the product.

The present invention provides a preparation method of a biomimetic aerogel material, comprising the following steps: A) Based on the melting characteristics of fatty alcohol sensitive to temperature, the mechanism of forming a conjugate structure between bisphenol A and 2-phenylamino-3-methyl-6-dibutylaminofluorane is regulated, and a temperature-sensitive color-changing capsule is synthesized; B) Using bio-based sodium alginate and sodium phytate as the aerogel framework, boron nitride nanosheets and temperature-sensitive color-changing capsules as fillers, a fireproof and photothermal deicing aerogel material is prepared by directional freeze-drying method. Water is used as the solvent in the synthesis process, which is green and environmentally friendly. By regulating the appearance of the aerogel through the temperature-sensitive color-changing capsule, sunlight is reflected in a high-temperature environment and absorbed and converted in a low-temperature environment, thus effectively suppressing the problems of summer light aging and winter low-temperature icing. Sodium alginate, sodium phytate, and boron nitride nanosheets jointly endow the aerogel with good flame retardant and fireproof properties.

The invention relates to the technical field of ocean engineering, in particular to an anti-abrasion material applied to ocean engineering and a preparation method of the anti-abrasion material. Comprising the following raw materials in parts by weight: 35-40 parts of a bisphenol A and epichlorohydrin polymer, 7-11 parts of a functional modifier, 4-7 parts of methyl ethyl ketone, 4-7 parts of a modified talc additive, 2-6 parts of a (chloromethyl) ethylene oxide polymer, 2-5 parts of methyl isobutyl ketone and 5.5 parts of a curing agent. According to the anti-abrasion material for ocean engineering, the raw materials such as a polymer of bisphenol A and epoxy chloropropane, methyl ethyl ketone and a polymer of (chloromethyl) ethylene oxide are matched with the functional modifier and the additive of modified talc to serve as additives, and the raw materials are blended and matched to achieve a common synergistic effect; the wear resistance, impact resistance and adhesive force of the prepared material product are coordinated and improved, and meanwhile, the product is remarkable in corrosion resistance-weather resistance long-term stability.

The invention discloses a production process of polycarbonate. The production process comprises the following steps: S1, carrying out prepolymerization reaction on a water-phase solution formed by mixing bisphenol A and sodium hydroxide and a liquid phosgene and dichloromethane solution; s2, carrying out polymerization reaction on the obtained prepolymerization reaction solution under the action of a catalyst to obtain a mixed solution of polycarbonate and water; s3, carrying out water-oil separation on the mixed solution obtained in the step S2 to obtain a polycarbonate solution; and S4, the polycarbonate solution in the step S3 is subjected to reduced pressure flash evaporation, high-concentration polycarbonate is obtained, and the steps S1 to S3 are carried out at high temperature and high pressure. According to the production process of the polycarbonate, the reaction time is shorter, the water-oil separation effect is better, and the obtained polycarbonate has narrower molecular weight distribution and better ground color heat resistance.

The invention discloses low-chroma and high-molecular-weight hydrogenated bisphenol A polycarbonate and a preparation method thereof, and the preparation method comprises the following steps: hydrogenated bisphenol A and a sulfonylation reagent are subjected to a reaction in an organic alkali, a low-temperature environment and a stirring condition, and purification is performed to obtain disulfonate; the preparation method comprises the following steps: carrying out melt transesterification reaction on disulfonate, diphenyl carbonate and aliphatic dihydric alcohol in the presence of a basic catalyst, carrying out polycondensation reaction after the reaction is finished, and carrying out bracing, cooling and pelletizing on the reaction product to obtain the hydrogenated bisphenol A polycarbonate with low chroma and high molecular weight, according to the preparation method disclosed by the invention, a strong electron-withdrawing reagent (sulfonylation reagent) is introduced to activate a hydroxyl bond of hydrogenated bisphenol A, so that the reaction efficiency is improved; the strong electron-withdrawing reagent enables oxygen atoms of hydroxyl to have positive electricity through an electron-withdrawing effect, so that the strong electron-withdrawing reagent is more easily attacked by a nucleophilic reagent and is promoted to leave in transesterification, and polycarbonate with high molecular weight can be synthesized.

The application relates to the field of polycarbonate preparation and discloses a bisphenol Z type polycarbonate resin, a structural formula of which is shown as formula I, wherein the number average molecular weight of the bisphenol Z type polycarbonate resin is 40,000-100,000, and the polydispersity is 1-3. The application provides a preparation method of the bisphenol Z type special polycarbonate, the bisphenol Z type polycarbonate prepared by the method is safe and stable in process, has little pollution, the raw materials are prepared by a green and environment-friendly route, the product has good quality and good thermal stability, and industrialized production can be realized. The polycarbonate prepared by bisphenol Z or derivatives thereof and carbonic acid diester under the catalysis of a catalyst has suitable molecular weight distribution, good solubility in a non-halogenated solvent, low cost and the like, different specifications of polycarbonates can be obtained by controlling the reaction, and the obtained polycarbonates have high mechanical strength.

The invention relates to the technical field of high polymer materials, in particular to a preparation method of a high-performance epoxy resin composite material, which comprises the following steps: carrying out secondary molecular distillation purification on epoxy resin to obtain a high-purity raw material; mixing bisphenol A and purified epoxy resin according to a set molar ratio, heating and dissolving, adding a methanol solution and a phosphorus-containing catalyst, and reacting to obtain a resin precursor; the preparation method comprises the following steps: ultrasonically dispersing nanoparticles and a reactive diluent to form a stable dispersion liquid; preheating epoxy resin, adding the dispersion liquid, stirring and ultrasonically adjusting the viscosity of the system; adding a curing agent and a toughening agent into the resin system, and stirring at a constant temperature to obtain impregnating resin; coating a mold with a release agent, injecting impregnated resin, vacuumizing, degassing, heating, supplementing materials, pressurizing, preserving heat, curing, cooling and demolding. The composite material prepared by the method is excellent in mechanical strength, heat resistance, flame retardance and stability, and good in ageing resistance and forming precision; the core technology has a synergistic effect, and the problems of insufficient purity and poor toughness are effectively solved.