1772 results about "Chain segment" patented technology

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 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 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.

The invention relates to the technical field of high-performance polymer material processing, in particular to a high-strength and high-modulus polyethylene fiber spinneret plate forming system and method.The system comprises a melt state monitoring module, a dynamic rheological coordination module, a micro-flow field reconstruction module, a molecular chain orientation module and an extrusion stabilization module; wherein the melt state monitoring module is used for acquiring an orientation degree real-time value and a pressure fluctuation value of a melt at an inlet of a spinneret plate; the dynamic rheological coordination module is used for generating a shear rate adjusting instruction and a pressure compensation instruction; the micro-flow field reconstruction module responds to the instruction and outputs a melt meeting a preset shear distribution condition; and the molecular chain orientation module is used for generating an axial stretching flow field in the convergence flow channel. According to the invention, through a melt state driven multistage flow field regulation and control and chain segment orientation control mechanism, the cooperative guarantee of orientation degree improvement and extrusion stability in the high-strength and high-modulus polyethylene fiber spinning process is realized.

The invention provides a preparation method of a self-repairing resin-based composite material based on dynamic bonds. The self-repairing epoxy resin comprises one covalent dynamic bond of a Diels-Alder bond, a disulfide bond or a borate bond, and the preparation method of the self-repairing epoxy resin comprises the following steps: heating epoxy resin to a molten state, adding a curing agent component while stirring, and carrying out a prepolymerization reaction to obtain a prepolymer; the curing agent comprises a rigid diamine curing agent, a dynamic diamine monomer and a flexible chain segment regulator, and the dynamic diamine monomer contains a dynamic covalent bond; and carrying out curing molding on the prepolymer to obtain the self-repairing epoxy resin. And impregnating reinforced fibers or fabrics thereof with the prepared prepolymer, and heating and curing to obtain the self-repairing resin-based composite material. The invention provides a chemical molecule design, dynamic reversible chemical bonds are introduced into a resin matrix, and by constructing the dynamic bonds, the composite material has high performance of a traditional composite material and also has life-like self-healing ability.

The invention relates to a use method of a micro-phase separated polyimide sizing agent for carbon fibers, which comprises the following steps: synthesizing polyamide acid with rigid and flexible chain segments alternately arranged by using a dianhydride monomer and a diamine monomer as raw materials, coating the polyamide acid on the surface of the carbon fibers, carrying out heat treatment, carrying out thermal cyclization on the polyamide acid to form polyimide, and carrying out body self-assembly at the same time, thereby obtaining the micro-phase separated polyimide sizing agent for the carbon fibers. And thus, the micro-phase separated polyimide coating is obtained. According to the method, the interface performance of the carbon fibers and the base material in the carbon fiber composite material can be improved, the thermal cyclization process of the sizing agent and microphase separation of the obtained surface coating are achieved at the same time through the heat treatment one-step method, and procedures and energy are saved.

The invention provides a polyacrylic acid inverse emulsion thickener and a preparation method thereof. The polyacrylic inverse emulsion thickener is prepared from the following components in parts by mass: 1 to 10 parts of modified attapulgite, 0.1 to 5 parts of hyperbranched acrylate, 30 to 60 parts of acrylic acid, 1 to 5 parts of a hydrophobic long-chain acrylate monomer, 5 to 20 parts of solvent oil, 0.5 to 5 parts of an emulsifier, 0.01 to 1 part of an initiator and 0.5 to 2.5 parts of a phase inversion agent. The preparation method comprises the following steps: firstly, introducing an isocyanate chain segment and a double-bond active group to the surface of acid-activated attapulgite to improve dispersity and reaction activity; then trimethylolpropane is used as a core, hyperbranched acrylate with multiple double bonds and a hyperbranched structure is constructed, and then the polyacrylic acid inverse emulsion thickener is prepared through an inverse emulsion method. Through the synergistic effect of the hyperbranched acrylate, the modified attapulgite and the hydrophobic long-chain monomer, the thickening performance, the electrolyte resistance and the long-term stability are remarkably improved.

The invention belongs to the technical field of polyurethane waterproof coatings, and particularly relates to a single-component fluorine-free high-hydrophobicity polyurethane waterproof coating and a preparation method thereof, and the single-component fluorine-free high-hydrophobicity polyurethane waterproof coating comprises the following raw materials by weight: 60-80 parts of composite polyether polyol; 20 to 40 parts of silane modified polyether polyol; 11 to 17 parts of diisocyanate; 2-5 parts of a chain extender; 50 to 70 parts of a plasticizer; 50 to 70 parts of filler; 0.15 to 0.2 part of a catalyst; and 3-5 parts of an auxiliary agent. A polyoxypentene ether chain segment, a castor oil-based structure and a silane group are introduced into the molecular structure of the waterproof coating through chemical modification, the intrinsic hydrophobic and mechanical properties of the material are improved, the migration defect caused by addition of a hydrophobic agent and silicone oil in a traditional preparation method is overcome, and the invention further provides a preparation method of the waterproof coating.

The invention discloses intrinsic copolymerized low-temperature toughened polyamide resin which comprises a polyamide component and a flexible chain segment component, and the molar ratio of the polyamide component to the flexible chain segment component is 98.5: 1.5-85: 15; the invention also discloses a preparation method of the intrinsic copolymerized low-temperature toughened polyamide resin, which comprises the following steps: mixing a polyamide component and a flexible chain segment component, and carrying out polymerization reaction in a sectional or continuous manner, and comprises a pre-polymerization process and a post-polymerization process; the intrinsic copolymerized low-temperature toughened polyamide resin obtained by the preparation method disclosed by the invention keeps excellent mechanical strength and modulus while improving low-temperature resistance of the intrinsic copolymerized low-temperature toughened polyamide resin.

The invention relates to a long-life room-temperature phosphorescent material and a preparation method and application thereof.According to the phosphorescent material, epoxy resin is doped with an epoxy prepolymer containing a fluorine-containing chain segment to serve as a host matrix, F-pi and pi-pi non-covalent synergistic interaction is formed between the host matrix and aromatic fluorescent guest molecules, the energy level difference of the excited state is adjusted, and the phosphorescent material is obtained. Intersystem crossing (ISC) and radiative transition rates are optimized, so that the phosphorescence lifetime and environmental adaptability are improved; a fluorine-containing chain segment introduced into a polymer system can be enriched on the surface of a material to form a needle-shaped structure, so that the surface energy of the material is remarkably reduced, the antifouling property is excellent, and additional functions of lyophobicity, transparency, chemical stability and the like are also realized while ultra-long room-temperature phosphorescence is realized; and cooperative enhancement and multifunctional integration of optical performance and surface performance are realized.

The invention provides a damping liquid silicone rubber material which is obtained by curing a damping liquid silicone rubber raw material composition, and also provides damping liquid silicone rubber and a preparation method thereof. The hardness and strength of the liquid silicone rubber material are improved through filling of the MQ silicon resin and the high-white carbon black, meanwhile, a large number of interface areas are formed by the nano-particles and a matrix, microcosmic slippage of the interfaces is generated under the action of dynamic stress, mechanical energy is converted into heat energy through friction and viscous effects between the interfaces and molecular chains, and damping is improved; according to the invention, by introducing methyl-terminated vinyl silicone oil, a silicone rubber chain forms a large number of suspension chain structures, energy dissipation is enhanced, hydrogen-containing chain extension is carried out at a use end, a main polymer has a longer free molecular chain segment to generate a friction effect, and the damping performance of the liquid silicone rubber material is further improved. Experimental results show that the liquid silicone rubber provided by the invention has excellent damping, mechanical and other properties under high hardness.

The invention discloses a high-flexibility drag chain cable and a preparation method thereof, belongs to the technical field of cable processing, and is used for solving the technical problem that the flame retardance and wear resistance of a drag chain cable in the prior art need to be further improved, and the high-flexibility drag chain cable specifically comprises a battery cell, a wrapping layer and a sheath layer which are sequentially arranged from inside to outside, and the sheath layer wraps the wrapping layer. The preparation method comprises the following steps: preparing a modified flame retardant from modified polysiloxane and a phosphorus-based substance through amine-aldehyde condensation, introducing the modified flame retardant into a polyurethane chain segment through a block reaction, carrying out a chain extension reaction to obtain modified polyurethane with a three-dimensional network structure, carrying out melt extrusion on the modified polyurethane, a filler and an auxiliary additive, and coating a wrapping layer with the obtained product. According to the drag chain cable, the flame retardant property and wear resistance of the drag chain cable are improved, and the distortion resistance of the drag chain cable is also improved.

This invention discloses a PETG co-extruded composite sheet and its preparation method. The method involves adding extruder and APET masterbatch to an extruder, then layering and combining the extruder melt and APET masterbatch melt to form a composite melt with an upper and lower layer of extruder and a middle layer of APET masterbatch. This is then shaped by roller pressing to obtain the PETG co-extruded composite sheet. During the blending process of modified polyester and modified filler, the epoxy group structure in the modified polyester molecule can react with the secondary amine in the modified filler, resulting in mild cross-linking and increasing the strength of the polyester material. The modified polyester molecular chain contains polysiloxane segments, and also has polysiloxane segments branched onto its side links. When impacted, the flexible polysiloxane segments absorb and dissipate a large amount of energy through violent movement, rotation, and entanglement. Furthermore, the nano-reinforcing points formed by the cage-like silsesquioxane structure within the molecule contribute to the excellent scratch resistance of the prepared composite sheet.

The invention belongs to the technical field of graphene and functional rubber composite materials, and particularly relates to a simplified preparation process of high-tear-strength graphene modified natural rubber with an interpenetrating double-crosslinking network structure constructed on the basis of double vulcanizing agents. Sulfur quickly forms a carbon-sulfur bond cross-linked network-C-Sx-C-with high cross-linking density in the natural rubber composite material to form a mechanical bearing skeleton between natural rubber main chains, so that the natural rubber composite material is endowed with high tear strength and fatigue resistance; the vulcanization rate of peroxide is relatively slow, the peroxide is slowly decomposed in a relatively low temperature region to generate free radicals, and a stable-C-C-crosslinking bond secondary crosslinking network between tail end chain segments of a carbon-sulfur bond main network is constructed outside a sulfur vulcanization skeleton network, so that the three-dimensional structural integrity of the vulcanization network is improved, and the loss modulus of rubber is reduced; and thus, heat generated during dynamic compression of the rubber is reduced. The tear strength of the natural rubber vulcanized rubber is effectively improved based on the synergy of nanofiller enhancement and an interpenetrating double-crosslinking network structure.

The invention discloses a UV curing adhesive for coating a low-refractive-index optical fiber and a processing method thereof, belongs to the technical field of adhesive preparation, and is used for solving the technical problem that the refractive index and the damp-heat resistance of the UV curing adhesive for coating the optical fiber in the prior art need to be further improved. The preparation method comprises the following steps: introducing a low-refractive-index hybrid siloxane prepolymer, a multi-component interface bonding prepolymer and a modified branched polyester prepolymer into a system together, and constructing a compact and uniform organic-inorganic three-dimensional network in a curing process by utilizing silica condensation, interface chemical bonding and a flexible chain segment cross-linking reaction, the low-refractive-index hybrid siloxane prepolymer endows a film layer with a stable refractive index, the multi-component interface bonding prepolymer enhances the binding force of a base material, the modified branched polyester prepolymer improves stress buffering and toughness, and the obtained cured film is low in refractive index, firm in interface bonding and small in mass change in a humid and hot environment and shows excellent optical stability and long-term reliability.

The invention relates to a preparation method of an antibacterial surface-modified polyurethane foam dressing, which comprises the following steps: firstly, preparing a polyurethane foam base material with an open pore structure through a reaction of polyol and isocyanate; then, the foam surface is subjected to plasma treatment or chemical oxidation and other pretreatment modes to activate the surface; then, grafting silane or macromolecular chain segments containing antibacterial groups on the surface of the foam; antibacterial agents such as nano-silver, quaternary ammonium salt or chitosan are further loaded; and finally, washing and drying to obtain the finished dressing. The method is simple and convenient to operate, the antibacterial property of the polyurethane foam can be effectively improved, the good liquid absorption property and softness of the polyurethane foam are kept, and the method is suitable for preparing dressings for chronic wounds, surgical postoperative wounds and infectious wounds.

The invention provides modified liquid epoxy resin, a liquid molding compound and a preparation method and application thereof, the modified liquid epoxy resin has a hard segment-soft segment-hard segment structure, the hard segment is composed of liquid epoxy resin, and the soft segment is composed of a flexible chain segment organic matter with an active group at the tail end. The liquid molding compound comprises the following components in percentage by mass: (A) 10-20% of the modified liquid epoxy resin; (B) 5-15% of a curing agent; (C) 70-90% of a filler; and (D) 0.1 to 1.5 percent of curing accelerator. The modified liquid epoxy resin provided by the invention can effectively reduce the crosslinking density, is beneficial to molecular movement, finally achieves the effects of reducing stress and shrinkage characteristics, can improve the toughness of a liquid plastic package material when being applied to the liquid plastic package material, reduces the internal stress and thermal expansion coefficient of the epoxy plastic package material, and has more excellent processability and process reliability.

The invention belongs to the technical field of composite pipes, and relates to a polytetrafluoroethylene and soluble polytetrafluoroethylene composite pipe as well as a processing method and application thereof. The preparation method comprises the following steps: firstly, carrying out ring opening polymerization on D3F and blocking by using an amino-containing silane coupling agent to prepare amino-terminated fluorosilicone oil, and taking the amino-terminated fluorosilicone oil as a lubricating agent for compounding and processing PTFE and PFA. The amino-terminated fluorosilicone oil contains a CF3 chain segment which has excellent compatibility with PTFE or PFA, and meanwhile, the cross-linking agent is added to form a chemical bond and a cross-linked structure with amino at the tail end of the lubricant, so that the wear resistance, tensile strength, permeability resistance and high-temperature creep resistance of the PTFE and PFA composite pipe can be improved, and the PTFE and PFA composite pipe can adapt to a long-term high-temperature working environment.

In some aspects, the present disclosure provides systems for forming hydrogels that comprise (i) a reactive multi-arm polymer that comprises three or more polymer arms linked to a core region, each arm comprising a polyether segment and a reactive moiety comprising a cyclic imide carboxy-C1-C5-alkyl ester end group or each arm comprising a polyether segment and a reactive moiety comprising a C2-C6-isocyanoalkyl end group and (ii) a polyamino compound comprising at least two amino (-NH2) groups, wherein the reactive multi-arm polymer and the polyamino compound react to form a crosslinked hydrogel that does not contain ester groups and has long-term stability in vivo. In some aspects, the present disclosure provides methods of treatment using such systems and hydrolysis-resistant crosslinked hydrogels formed from such systems.

The invention relates to a PVB (Polyvinyl Butyral) film for PDLC (Polymer Dispersed Liquid Crystal) dimming glass, a preparation method and the PDLC dimming glass, and belongs to the technical field of dimming glass. The PVB film for the PDLC dimming glass comprises PVB resin and a plasticizer, at least one end group of the plasticizer is a benzoate group, and the plasticizer belongs to benzoate. Through molecular structure design, the main chain of the plasticizer can be a polyether type [-CH2-CHY-O-] n chain segment or a polyol skeleton, and meanwhile, benzoate groups or specific end group structures (such as branched chain alkyl, aromatic hydrocarbon and the like) are introduced, so that the interaction (such as hydrogen bond damage, dipole interaction, pi-pi accumulation and the like) between the plasticizer and PVB resin is enhanced, and the plasticizer can be used for preparing PVB resin. By introducing structures such as branched chains and aromatic rings, the steric hindrance and rigidity of molecules are greatly improved, and migration and precipitation phenomena of the plasticizer in the PVB film are effectively inhibited.

The invention discloses an indoor flame-retardant insulated flexible wire and a preparation method thereof, belongs to the technical field of flexible wires, and is used for solving the technical problem that the insulating property and flame-retardant property of an indoor flexible wire in the prior art need to be further improved. The cable comprises a wire layer formed by twisting a plurality of copper wires, an insulating layer and an outer sheath layer, a modified aminating agent taking a siloxane chain segment as a main body is prepared, polyvinyl chloride is aminated and hybridized with a space chain segment of the polyvinyl chloride at the same time, after phosphorus-hydrogen addition and surface modification, the hybridized polyvinyl chloride is obtained, and through sodium hypophosphite and 1, 2, 4-trimethyl-1, 3-pentanediol, the flame retardant is added to the polyvinyl chloride, so that the cable is formed. The preparation method comprises the following steps: carrying out phosphorus-hydrogen addition on 2, 3-dihydroxystyrene to obtain a modified cross-linking agent, forming a spherical structure by the modified cross-linking agent and phosphonitrilic chloride trimer under triethylamine and ultrasonic conditions, carrying out surface modification to obtain flame-retardant microspheres, and carrying out melt extrusion on the modified cross-linking agent and phosphonitrilic chloride trimer as main materials and auxiliary materials of an outer sheath layer to finally prepare the flame-retardant insulated flexible wire.

The invention provides polyester and a preparation method and application thereof, the polyester comprises a structural unit derived from the following monomer components: at least one monomer component I selected from hydroxybenzoic acid or hydroxynaphthoic acid; and at least one monomer component II, wherein the monomer component II is selected from p-hydroxybenzoic acid containing a substituent group. A small amount of the monomer component II is introduced into the polyester material, interaction points are provided for chain segments of the polymer, the chain segments are promoted to form a branched structure, and therefore the melt strength of the polymer is well improved.

The invention discloses an LED (light-emitting diode) pouring sealant which is prepared from the following components: alicyclic epoxy resin, a glycidyl ether toughening agent, a thermal initiation cation curing agent, an anhydride curing agent and the like. A rigid ring structure of the alicyclic epoxy resin and a flexible chain segment of the anhydride curing agent are subjected to ring-opening reaction to form a three-dimensional cross-linked network; the alicyclic epoxy resin and the anhydride curing agent are combined to form an interpenetrating polymer network, the anhydride curing agent is further crosslinked through an esterification reaction in a high-temperature stage to form a high-density interpenetrating network, and the structure not only retains the weather resistance of the alicyclic epoxy resin, but also relieves internal stress through a flexible chain segment of anhydride, so that the volume shrinkage rate after curing is reduced to 0.5% or below; meanwhile, a glycidyl ether toughening agent is inserted into double networks through long-chain ether bonds to form tough nodes, crack propagation is inhibited, and the comprehensive performance of the colloid is remarkably improved by combining an anhydride curing agent vacuum dehydration and staged curing process.

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

The invention provides a low-melting-point PET short fiber, and relates to the technical field of fiber production. The low-melting-point PET short fiber comprises a high-strength low-melting-point PET short fiber, the short fiber is of a skin-core composite structure, a skin layer of the skin-core composite structure is modified low-melting-point polyester and is prepared by melt copolymerization of PET, 10-30% of rigid comonomers and 5-15% of flexible chain segments, the melting point is 110-160 DEG C, and the glass-transition temperature (Tg) is larger than or equal to 60 DEG C. The gradient interface enhancement technology is adopted, the PET-g-PE grafting layer is introduced between the skin layer and the core layer, the grafting rate reaches 5-8% through melt blending, a transition layer of 1-3 microns is formed, the peel strength is improved to 1.5 N / cm or above, and the problem of interface stripping of traditional composite fibers is solved.

The invention relates to a flame-retardant high-temperature-resistant fiber woven fabric and a preparation process thereof, and belongs to the technical field of textiles. The preparation method comprises the following steps: grafting and crosslinking a self-made grafting monomer and polyvinyl chloride, and then weaving to obtain the modified polyvinyl chloride fiber fabric; a phosphate group in the monomer can promote surface carbonization to form a protective carbon layer, silicate generated by decomposition of a siloxy group at a high temperature is combined with the carbon layer to improve the strength and melt viscosity of the carbon layer, and the phosphate group and the siloxy group synergistically enhance the flame retardance and the molten drop resistance of the fabric; a cyclic phosphate group and a pyridine ring are connected to form a rigid structure with relatively high thermal stability, chain segment movement is limited, a plurality of siloxy groups in a monomer are crosslinked to form a crosslinked network, molecular chain segments are difficult to move, and the combination of the rigid group and the crosslinked network improves the high temperature resistance of the fabric and effectively improves the mechanical properties of the fabric; in addition, the positively charged quaternary ammonium salt structure in the monomer improves the antistatic performance of the fabric, and cooperates with trifluoromethyl to destroy the structural integrity of bacterial cells, so that the fabric achieves efficient bacteriostasis.