2703 results about "Chain segment" patented technology

The invention discloses a high temperature and high pressure resistant electric power tube and a preparation method thereof, the electric power tube comprises the following raw materials by weight: 100-120 parts of polyethylene master batch, 5-10 parts of a modifier, 0.5-1 part of benzoyl peroxide and 20-30 parts of a modified filler, in a melt extrusion process of the raw materials, a maleimide structure on a molecular side chain of the modifier can be grafted with a polyethylene molecular chain, and the molecular chain of the modifier can be grafted with the polyethylene molecular chain. Meanwhile, an organic silicon chain segment and a benzene ring structure are added in a polymer molecule, the high-temperature-resistant effect of the material is improved, after reflux treatment in water, a siloxane structure in the modified filler and a siloxane structure in a modifier molecule can be subjected to hydrolytic condensation, and therefore the high-temperature-resistant and high-pressure-resistant effects of the material are improved. According to the invention, polyhedral oligomeric silsesquioxane is taken as a core, boron nitride is taken as a shell to form a core-shell structure, and the three-dimensional grid structure of the polymer can greatly improve the high-temperature-resistant and high-pressure-resistant effects of the polymer.

The invention discloses a photo-thermal aging resistant polyester composite material and a preparation method thereof, a modified monomer, a modified filler, benzophenone, terephthalic acid and neopentyl glycol are subjected to esterification condensation polymerization to prepare the composite material, and the modified monomer is added, so that the prepared polyester molecule is of a branched structure; the side chain of a polyester molecule and the surface of the modified filler both contain unsaturated double bonds which can react after being irradiated by ultraviolet light, so that the number of crosslinking points of the composite material is increased, the crosslinking density is further improved, and the anti-aging effect of the material is further improved; the modified filler can improve the high-temperature-resistant effect of the composite material, the modified filler is matched with the hindered phenol structure of the side chain to further improve the heat aging-resistant effect of the composite material, hydroxyl and ketone groups on the modified filler form intramolecular hydrogen bonds, light energy can be converted into heat energy to be released, and then the light aging-resistant effect of the composite material is improved.

The invention relates to the technical field of polyurethane production, in particular to a polyurethane super-hydrophobic foam composite material for packaging and a preparation method thereof. The polyurethane super-hydrophobic foam composite material for packaging is prepared by reacting a component A and a component B according to a mass ratio of 100: (31.7-46.5), wherein the component A comprises polyether polyol X with high molecular weight and high activity, polymer polyol, a chain extender, a cross-linking agent, an organic metal catalyst, a tertiary amine catalyst, a foam stabilizer, a foaming agent, a flame retardant, inorganic filler and the like, and the component B is isocyanate modified by polyether polyol Y with high functionality. An ester bond, a rigid benzene ring group and a Si-O-Si chain segment are introduced into a polyether polyol molecular chain segment to improve the internal soft segment structure and chemical crosslinking density of the polyurethane foam, and the prepared super-hydrophobic polyurethane foam not only has excellent hydrophobicity and high temperature resistance, but also is low in density and good in mechanical property.

The invention relates to the technical field of protective films, in particular to a low-viscosity low-climbing polyurethane optical protective film and a preparation method thereof. The preparation method comprises the following steps: carrying out sulfydryl-alkene click reaction on double-bond-containing hyperbranched polyester, 1H, 1H, 2H, 2H-perfluorodecanethiol and sulfydryl-containing organic silicon, and introducing a fluorine-containing chain segment and a siloxane chain segment to obtain modified hyperbranched polyester; then introducing the modified hyperbranched polyester into polyurethane through a grafting modification method, so as to prepare the polyurethane adhesive; and coating the surface of a base material with the polyurethane adhesive, compounding with a release film, and curing to obtain the polyurethane optical protective film. The polyurethane optical protective film prepared by the invention has excellent low viscosity and low climbing performance, can effectively protect the surface of an optical device from being polluted and damaged, and improves the service life and stability of the optical device.

The invention belongs to the technical field of polyurethane pouring sealants, and particularly relates to a two-component hydrophobic heat-resistant polyurethane pouring sealant and a preparation method thereof. The pouring sealant is prepared by reacting a component A and a component B, the component A is prepared from the following raw materials in parts by weight: 17 to 33 parts of modified polyether polyol I; 15 to 27 parts of modified polyether polyol II; 18 to 30 parts of diisocyanate; 20 to 34 parts of a plasticizer; the component B is prepared from the following raw materials in parts by weight: 47 to 64 parts of polyether polyol III; 36 to 53 parts of filler; and 0.15 to 0.35 part of a catalyst. Introducing a silicon-oxygen-silicon chain segment into a polyether polyol structure through acrylic acid bridging to prepare siloxane modified polyether polyol; more side ethyl, phenyl and neopentyl structures are introduced into the polyether polyol, so that the intrinsic hydrophobicity and temperature resistance of the raw materials are further improved, and the polyurethane pouring sealant shows relatively high hydrophobicity and heat resistance.

The invention relates to the technical field of coatings, and discloses an amino-terminated ether-containing hyperbranched polyamide modified epoxy resin coating, which comprises a component A: 100 parts of a water-borne epoxy resin emulsion, 5-20 parts of titanium dioxide, 1-2.5 parts of a dispersant, and 0.05-0.2 part of an antifoaming agent; the component B is prepared from 50 to 70 parts of amino-terminated ether-containing hyperbranched polyamide; the amino-terminated ether-containing hyperbranched polyamide contains an active amino-terminated group, so that the amino-terminated ether-containing hyperbranched polyamide is used as a curing agent and is subjected to a cross-linking curing reaction with epoxy resin, the hyperbranched polyamide has a three-dimensional branched network structure and forms a spatial cross-linked interpenetrating network system with the epoxy resin, and the hyperbranched polyamide contains a flexible ether-containing chain segment and an alkyl chain segment, so that the cross-linking property of the hyperbranched polyamide is improved. The epoxy resin coating has a good toughening effect, improves the impact resistance and impact strength of an epoxy resin coating layer and a casting body thereof, and keeps high hardness and tensile strength at the same time.

The invention discloses a wear-resistant and impact-resistant composite PVC material and a preparation method thereof, and belongs to the technical field of high polymer materials, the wear-resistant and impact-resistant composite PVC material comprises the following raw materials by weight: 80-100 parts of epoxy polyvinyl chloride, 10-15 parts of a plasticizing stabilizer, 10-12 parts of an impact modifier, 0.5-2 parts of a lubricant, 5-10 parts of a filler, 2-3 parts of an antioxidant and 2-3 parts of a heat stabilizer; the preparation method comprises the following steps: preparing a metal soap stabilizer, absorbing pyrolysis gas, decomposing to generate metal chloride, enhancing the flame retardant property of the material, and uniformly dispersing the metal soap stabilizer as a filler in the material, so that an epoxy group in the prepared modifier absorbs hydrogen chloride and hybridizes a polyvinyl chloride chain segment at the same time, thereby enhancing the flame retardant property of the material. And a double-bond structure reacts with pyrolysis free radicals to generate an annular structure, so that the impact resistance of the material is enhanced.

The invention discloses a high-elasticity water-resistant flexible waterborne polyurethane elastic film product, and belongs to the field of waterborne polyurethane elastic film products. The waterborne polyurethane structure contains a strong supramolecular dynamic crosslinking unit and a polysiloxane unit, the strong supramolecular dynamic crosslinking unit has a metal-ligand effect and an optional multiple hydrogen bond effect, and the metal-ligand effect is preformed. In the polymerization process of the waterborne polyurethane, a preformed metal complex with a metal-ligand function serves as a weaving node, and the metal complex serves as a monomer and is cross-linked with a waterborne polyurethane chain segment. Due to the woven cross-linked interweaving structure, macromolecular chains connected to weaving nodes are spontaneously entangled. High polymer chain entanglement, reversibility of dynamic bonds and a cross-linked network endow the film with high strength, high elasticity, high flexibility and high density; meanwhile, the polysiloxane endows the film with water resistance and low viscosity. The waterborne polyurethane elastic film product prepared by adopting the structure is super-flexible, high in elasticity and good in water resistance.

The invention discloses a medium-temperature curing high-temperature-resistant high-adhesion epoxy structural adhesive film as well as a preparation method and application thereof. The preparation method comprises the following steps: reacting high-rigidity diisocyanate with polyether polyol to obtain a polyurethane prepolymer, then adding bisphenol epoxy resin to carry out grafting reaction, and then adding carboxyl-terminated nitrile rubber to react with an epoxy group to obtain the high-temperature-resistant high-adhesion epoxy resin. And finally, mixing with a curing system and coating to obtain the intermediate-temperature curing high-temperature-resistant high-adhesion epoxy structural adhesive film. The preparation process disclosed by the invention is reasonable, and the high-temperature resistance of the adhesive film is remarkably improved by introducing high-rigidity groups such as naphthalene ring, biphenyl or p-benzene while the excellent processing property of the adhesive film is ensured; and through the synergistic effect of the polyurethane flexible chain segment and the nitrile rubber, the toughness and the adhesive property of a resin system are improved, and the loss of the resin in the forming process is reduced.

The invention belongs to the field of preparation of non-isocyanate polyurethane, and particularly relates to a preparation method of an extreme-environment-resistant non-isocyanate polyurethane adhesive, which comprises the following steps: preparing a cyclic carbonate monomer containing a rigid structure, selecting the type of di / polyamine, and adjusting the ratio of a flexible chain segment amine compound to a rigid amine compound, thereby obtaining the extreme-environment-resistant non-isocyanate polyurethane adhesive. A series of non-isocyanate polyurethane adhesives with excellent mechanical properties are prepared, and controllability of bonding strength and extreme environment resistance is realized. The adhesive disclosed by the invention is simple in synthesis method, reaction conditions are easy to control, and the lap joint shear strength of bonded Al can reach 16.7 MPa; the lap joint shear strength at the low temperature of-196 DEG C reaches 15.6 MPa; and the overlapping shear strength at the high temperature of 190 DEG C reaches 15.2 MPa. After a bonded sample is soaked in a solvent for 24 h, the lap shear strength can still be maintained at 15.4 MPa or above and can reach 16.5 MPa, and the adhesive can be widely applied to the fields of aerospace, medical instruments, chemical product packaging and the like and has good market prospects.

The invention belongs to the field of adhesive properties of high polymer materials, and particularly relates to a copolyamide hot melt adhesive and a preparation method thereof. Dimer acid, propionic acid, hexamethylenediamine and 1, 3-diamino-2-propanol are used as raw materials to prepare polyamide resin, and then modified organic silicon and carboxylated nano silicon dioxide are used for modification to obtain the copolyamide hot melt adhesive. Polyamide resin is modified by adding organic silicon into the polyamide resin, macromolecular chain segments are easy to rotate due to introduction of flexible Si-O bonds, part of internal stress can be eliminated, fracture energy can be absorbed to the maximum extent, and the fracture performance of the resin is effectively improved; in addition, due to the introduction of the inorganic nanoparticles, the rigidity, stability and the like of the nanoparticles can be combined with the toughness, cohesiveness and the like of the graft polymer, so that the graft polymer has excellent properties of both the inorganic nanoparticles and the organic polymer.

The invention discloses a halogen-free flame-retardant TPU (thermoplastic polyurethane) material suitable for a charging pile cable and a preparation method of the halogen-free flame-retardant TPU material, belongs to the technical field of TPU material processing, and aims to solve the technical problem that the flame retardance and wear resistance of a TPU material for a cable in the prior art need to be further improved. The material comprises the following raw material components in parts by weight: 80-100 parts of a cross-linked thermoplastic elastomer, 10-20 parts of a modified filler, 10-20 parts of a flame-retardant chain extender, 3-5 parts of a stabilizer, 3-5 parts of an antioxidant, 3-5 parts of an ultraviolet light absorber and 3-5 parts of a lubricant, after the modified thermoplastic elastomer is prepared, the modified thermoplastic elastomer is activated and cross-linked with the flame-retardant cross-linking agent, a silane structure is introduced into the structure, the flame-retardant cross-linking agent and the modified filler enhance the flame-retardant capability of the material through a synergistic effect, and meanwhile, the compatibility of the material and an inorganic material is enhanced by hybridizing a polyurethane chain segment; the wear resistance, flame retardance and other properties of the material are improved.

The invention discloses a halogen-free flame-retardant TPU (thermoplastic polyurethane) cable material and a preparation method thereof, belongs to the technical field of TPU processing, and aims to solve the technical problem that the wear resistance and flame retardance of a TPU cable material in the prior art need to be further improved. The TPU cable material is prepared from the following raw material components in parts by weight: 80 to 100 parts of polyurethane elastomer, 1 to 2 parts of antioxidant, 1 to 3 parts of stabilizer, 10 to 15 parts of plasticizer, 10 to 20 parts of filler and 5 to 10 parts of flame-retardant glass powder. The TPU cable material is obtained by blending, melting and extruding the polyurethane elastomer, the flame-retardant glass powder and auxiliary materials; during combustion, flame-retardant groups in the polyurethane elastomer and the flame-retardant glass powder are decomposed to promote carbonization of triazine groups in the polyurethane elastomer to obtain a flame-retardant layer, and the TPU cable material is flame-retardant, wear-resistant, stretch-resistant, high-temperature-resistant and more environment-friendly through crosslinking of organic chain segments and synergistic cooperation of functional groups.

The invention discloses a corrosion-resistant and anti-aging plastic packaging film and a preparation method thereof, and is used for solving the technical problem that the corrosion resistance and ultraviolet aging resistance of a packaging film in the prior art need to be further improved. The polypropylene composite material comprises the following raw materials in parts by weight: 60-80 parts of modified polypropylene resin, 1-2 parts of a compound nucleating agent, 10-15 parts of a modified filler, 1-2 parts of an antioxidant, 1-2 parts of an ultraviolet light absorber, 1-2 parts of a light stabilizer and 3-5 parts of a plasticizer, the tensile property of the material is improved through crystal form remolding, and the flame retardant property of the material is improved through synergistic cooperation of an internal phosphate structure, an aluminum element and thiocyanuric acid and siloxane chain segments in the material; and the ultraviolet light absorber cross-linked by the compound nucleating agent, the modified filler and the siloxane chain segment are synergistically matched, so that the ultraviolet aging resistance of the material is remarkably improved.

The invention provides a comb-shaped polymer binder, a pole piece and a battery, the comb-shaped polymer binder comprises an acrylate main chain, a flexible soft segment, a polar hard segment and a functional chain segment, the flexible soft segment, the polar hard segment and the functional chain segment are respectively grafted on the acrylate main chain, the flexible soft segment comprises an ether chain segment and / or an ester chain segment, the polar hard segment comprises a polar group and / or a first heteroaromatic ring group, and the functional chain segment comprises a functional group and a second heteroaromatic ring group. The functional chain segment comprises an aromatic ring group containing a pi-conjugated structure and / or a second heteroaromatic ring group containing a pi-conjugated structure. The comb-shaped binder adopts a structural design of'hard section anchoring + soft section buffering + functional side chain ', is helpful for enabling the binder to have high peel strength, stress buffering and electron conduction capabilities at the same time, is compatible with an existing wet coating-rolling process, is helpful for improving the peel strength and prolonging the cycle life of an electrode plate when being used for preparing the electrode plate, and is beneficial for improving the service life of the electrode plate. And the rate capability of the battery is improved.

The invention discloses CPVC (Chlorinated Polyvinyl Chloride) modification-based high-wear-resistance antistatic plastic and a preparation method thereof, belongs to the technical field of composite CPVC preparation, and aims to solve the technical problem that the wear resistance and the antistatic property of CPVC-based plastic in the prior art need to be further improved. The high-wear-resistant antistatic plastic based on CPVC modification comprises the following raw materials in parts by weight: 80-100 parts of modified CPVC, 6-8 parts of a modified heat stabilizer and 8-16 parts of an auxiliary material, the amino group on the surface of the prepared antistatic filler participates in the ammoniation process of the prepared CPVC, a large number of amino groups hybridize the chain segment structure of the CPVC and introduce tertiary amino groups, and an ion structure is introduced into the hybridized CPVC through quaternary ammonium salinization to obtain the modified CPVC. The CPVC-based plastic is obtained by mixing, melting and extruding the CPVC-based plastic, the prepared polyamide acid-based modified heat stabilizer and auxiliary materials.

The invention discloses a low-temperature-resistant, acid-resistant and alkali-resistant roof waterproof coating and a preparation method thereof. The coating is prepared from various raw materials such as acrylate-organosilicone copolymer emulsion and polyurethane modified acrylate resin, and a key raw material is prepared through free radical polymerization and addition polymerization reaction. The preparation method comprises the steps of pre-dispersion, auxiliary agent dispersion, pigment and filler dispersion, emulsion and functional auxiliary agent compounding, performance regulation and control and the like. The acrylate-organic silicon copolymer emulsion and the polyurethane modified acrylate resin form an interpenetrating network through physical blending and chemical crosslinking, and the low-temperature toughness of a flexible phase and the chemical resistance of a rigid phase are both achieved. In a low-temperature environment, the rigidity embrittlement of the polyurethane resin is counteracted by the flexibility of the organosilicone chain segment, so that the cracking of the coating is avoided; in an acid-base environment, a urethane bond of polyurethane and a silicon-oxygen bond of organic silicon cooperate to resist chemical erosion, molecular chain breakage is reduced, and the problem that an existing waterproof coating is insufficient in performance in the low-temperature and acid-base environment is effectively solved.

The invention belongs to the technical field of cosmetics, and discloses a cyclodextrin-based water-resistant modified polyurethane film-forming agent and a preparation method thereof. The cyclodextrin-based water-resistant modified polyurethane film-forming agent comprises a hydrophilic chain segment and a hydrophobic chain segment, the hydrophilic chain segment comprises a chain segment formed by raw materials of cyclodextrin and 2, 2-dimethylolbutyric acid, and the hydrophobic chain segment comprises a chain segment formed by a raw material of organosilicon. Compared with the prior art, the cyclodextrin-based water-resistant modified polyurethane film-forming agent disclosed by the invention has good film-forming property, water resistance, dispersity, softness and adhesive force, can also be used as a film-forming material of cosmetic products, and enhances the waterproof, sweat-resistant and lasting characteristics of cosmetics.

The present disclosure relates to a copolymer and a polymersome for targeted delivery of biomolecules to a living organism. The exemplary copolymer comprises an initiator block, a propagator block, and a linkage connecting the initiator block and the propagator block. The initiator block comprises a glycan head configured to provide a targeted delivery, and the propagator block comprises a functional moiety configured to provide desired properties for the polymersome.

The invention provides a polymer, a preparation method thereof, a positive pole piece, a secondary battery and an electric device. The polymer comprises a structure as shown in a formula I, X comprises a phosphate group or a phosphite group, R1 and R3 respectively and independently comprise at least one of a polyether chain segment, a polyester chain segment, hydrogen and alkyl, and at least one of R1 and R3 comprises the polyether chain segment or the polyester chain segment; and R2 comprises an organic chain segment. According to the polymer provided by the invention, the flexibility of a pole piece can be improved while the maximum solid content of positive electrode slurry is effectively improved, the filtering time is shortened and the production efficiency and quality of the pole piece are improved.

The invention belongs to the technical field of polymers, and discloses a bio-based parallel composite elastic fiber which comprises a first fiber and a second fiber, the first fiber is prepared from diamine monomer modified bio-based polytrimethylene terephthalate; and the second fiber is prepared from diamine monomer modified bio-based polytrimethylene terephthalate with a poly (trimethylene ether glycol) chain segment. According to the fiber, two kinds of polytrimethylene terephthalate are adopted for parallel composite spinning, the comfort and softness, rebound resilience and breaking strength of the fiber are improved through a poly trimethylene ether glycol chain segment, the compatibility, comfort and softness, rebound resilience and breaking strength of the two kinds of fiber are further improved through diamine modification, and a fiber material with excellent performance is obtained. Meanwhile, the invention also provides a preparation method of the fiber material.

The invention discloses a lignin / carbon black / natural rubber composite material as well as a preparation method and application thereof. The composite material is prepared from the following components in parts by mass: 100 parts of natural rubber, 1-50 parts of lignin, 1-50 parts of carbon black, 0.5-8 parts of a lignin modifier, 1-8 parts of a coordination aid, 0.1-0.5 part of a peroxidation initiator, 0.5-5 parts of elemental sulfur and 0.1-10 parts of a vulcanizing aid. In-situ modification is carried out on the surface of lignin particles, unsaturated double bonds are grafted on the surface of lignin in a rubber mixing process, so that the lignin can form certain covalent bond connection with a rubber chain segment in a vulcanization process, and the content of binding glue on the surface of the lignin is increased; further, interface covalent bond and interface coordination bond connection can be constructed between the lignin and the rubber, and further enhancement of a lignin / rubber system can be realized.

The invention provides a method for reducing the rubber crack propagation rate and a tire, and relates to the technical field of tire rubber.The method for reducing the rubber crack propagation rate comprises the steps that the maximum tearing energy in an application scene is obtained; determining the addition amount of organic polysulfide and sulfur in a vulcanizing agent according to the maximum tearing energy; and mixing the vulcanizing agent with the raw materials to obtain the target rubber material. When the maximum value of the tearing energy is large, the organic polysulfide is added into the sulfur, the organic polysulfide contains a plurality of thioalkyl chain segments, and in the vulcanization process, flexible alkyl chains can be connected into rubber macromolecules to form a composite cross-linked network structure which is more stable and higher in strength, so that the breaking tensile strength and the tearing strength of tire rubber are improved, and the service life of the tire rubber is prolonged. And the expansion rate of cracks can be reduced while bearing relatively high tearing energy, so that the service life is prolonged.

The invention discloses a degradable PLA composite material and a preparation method thereof, and belongs to the technical field of polylactic acid materials, the degradable PLA composite material comprises the following raw materials by mass: 80-95 parts of polylactic acid, 5-15 parts of carboxyl-terminated hyperbranched polycaprolactone, 3-5 parts of potassium titanate whisker, 0.1-3 parts of an antioxidant, 1-5 parts of a compatilizer and 1-2 parts of an anti-hydrolysis agent. By compounding carboxyl-terminated hyperbranched polycaprolactone and polylactic acid, a large number of flexible chain segments are introduced into a polylactic acid matrix material, so that the problem of high brittleness of polylactic acid can be well solved; the potassium titanate whiskers are also added into the composite material, and the thermal stability and mechanical properties of the material can be improved due to the excellent strength and stability of the potassium titanate whiskers. And the potassium titanate whisker can be used as a nucleating agent to solve the problem that the crystallization property of the polylactic acid is reduced due to compounding of the carboxyl-terminated hyperbranched polycaprolactone, and the crystallinity of the polylactic acid composite material is improved, so that the heat resistance of the polylactic acid composite material is improved.

The invention relates to the field of new materials, and discloses a method for preparing a composite material by filling PLA / PBS with fibers, and the composite material comprises the following raw materials by weight: 30-40 parts of polylactic acid, 10-20 parts of poly (butylene succinate), 40-50 parts of fibers, and 1-3 parts of maleic anhydride grafted polylactic acid. Comprising the following steps: S1, performing gradient modification on fibers: S101, pretreating the fibers by using a compound enzyme; s102, in a polylactic acid melt blending stage, adding maleic anhydride to carry out in-situ grafting compatibilization; s2, low-temperature high-shear dispersion: mixing the fibers modified in the step S1 with polylactic acid, poly (butylene succinate) and maleic anhydride grafted polylactic acid. Through a fiber gradient modification technology, bio-enzyme pretreatment and maleic anhydride in-situ grafting compatibilization are utilized, and an interpenetrating network structure of a polylactic acid chain segment is formed on the fiber surface, so that the tensile strength of the composite material is effectively improved to 80-90 MPa.

The invention discloses a double-block polymeric monomer, a preparation method thereof and a polycarboxylic acid water reducing agent which uses the double-block polymeric monomer and is suitable for low-carbon cement. The polycarboxylate superplasticizer is formed by copolymerization of a double-block polymeric monomer A, an unsaturated carboxylic acid monomer B and a polymerizable phosphoric acid monomer C through free radicals, wherein the double-block polymeric monomer A is a polymeric monomer composed of an unsaturated multi-element heterocyclic chain segment near a double-bond end and a polyether polyol acrylate chain segment far away from the double-bond end. The polycarboxylic acid water reducing agent is suitable for low-carbon cement, solves the problems of weak dispersion and poor adaptability of the existing water reducing agent in the application process of the low-carbon cement, and is more suitable for low-carbon cement concrete containing various complex admixtures such as slag, clay and the like.

The invention discloses a method for preparing a polyester fabric through cyclic regeneration of waste polyester textiles, belongs to the technical field of polyester recovery, and is used for solving the technical problem that the mechanical property and antibacterial ability of a regenerated polyester fabric in the prior art need to be further improved. The method comprises the following steps: adding the waste polyester textile and modified multilayer graphene into a high-pressure reaction kettle, carrying out carbon dioxide supercritical depolymerization to obtain a depolymerized mixed solution, preparing the modified multilayer graphene, slowly releasing supercritical fluid by virtue of an abundant gap structure, and preparing the modified multilayer graphene into the high-pressure reaction kettle. According to the preparation method, modified multilayer graphene is modified, the depolymerization effect is improved, meanwhile, rich active functional groups on the surface provide in-situ polymerization sites for a depolymerization monomer, the depolymerization monomer serves as a polymerization hub structure to provide support for an organic chain segment, a space structure is hybridized through a chain extender, finally, the flame-retardant antibacterial liquid is prepared, effective components of the flame-retardant antibacterial liquid are cross-linked with the modified multilayer graphene, and the flame-retardant antibacterial performance is improved. In the combustion process, the chain extender is promoted to be carbonized, and the regenerated polyester fabric which is flame-retardant, antibacterial and excellent in mechanical property is obtained.

A polyester copolymerized polycarbonate belongs to the technical field of polycarbonate materials, and has the following structure: a molecular chain is a randomly distributed multi-block structure of a polycarbonate segment and a polyester segment, the polycarbonate segment is a polymerized chain segment of an epoxy compound, carbon dioxide and any cyclic anhydride, and the polyester segment comprises one or more of PCL, PGA, PBAT, PHA and PBS. The material integrates the advantages of polycarbonate and various polyesters, the variety and proportion of polyester segments can be adjusted according to different application requirements, performance customization is achieved, and the material has good biocompatibility, degradability, weather resistance and mechanical property.

The invention relates to the field of polyester materials, and particularly discloses modified polyester with low yellowness value and high glass transition temperature characteristics and a preparation method thereof, and the modified polyester is prepared by taking terephthalic acid, diphenyldicarboxylic acid and fluorenyl aromatic dicarboxylic acid as carboxylic acid monomers, respectively esterifying with ethylene glycol, and carrying out co-polycondensation on corresponding esterification products. According to the present invention, the biphenyldicarboxylic acid with the conjugated aromatic ring structure and the fluorenyl aromatic dicarboxylic acid monomer are selectively introduced to modify the PET, such that the regularity of the polyester chain segment is broken so as to ensure the optical performance of the polyester; the movement of a polyester chain segment is limited so as to improve the Tg value of polyester; and by matching with a novel preparation method, the yellowness value of the polyester material is reduced.

The invention discloses an adhesive containing epoxy-terminated polyurethane epoxy resin as well as a preparation method and application of the adhesive. The adhesive comprises the following components in parts by weight: 10-15 parts of epoxy resin, 70-75 parts of epoxy-terminated polyurethane epoxy resin, 19-21 parts of an amine curing agent and 8-15 parts of heat-conducting filler, wherein the epoxy-terminated polyurethane epoxy resin is obtained by reacting a polyurethane prepolymer and epoxy resin, NCO of the polyurethane prepolymer and hydroxyl of the epoxy resin are subjected to an addition reaction, and after the reaction is finished, NCO of a system is eliminated by adopting a small-molecule epoxy compound; the polyurethane prepolymer is obtained by reaction of isocyanate and polyether polyol with flexible chain segments. According to the adhesive, the curing heat release peak value is reduced, the toughness is improved, meanwhile, the high strength is kept, the foaming problem is avoided, the defects that a traditional epoxy adhesive is high in heat release and poor in toughness are overcome, and the adhesive is suitable for the fields such as aerospace and electronic and electric appliances which have strict performance requirements.