2422 results about "Maleimide" 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 relates to the technical field of textiles, in particular to a wear-resistant antibacterial flax blended yarn and a preparation process thereof. The method specifically comprises the following steps: S1, after performing ultraviolet irradiation on cotton fibers, putting the cotton fibers into a wear-resistant antibacterial solution, and performing dipping and drying to obtain wear-resistant fibers; s2: (1) modifying chitosan by using 6-maleimidohexanoic acid, so as to obtain modified chitosan; (2) sequentially reacting polyethylene glycol adipate with isophorone diisocyanate, modified chitosan and sodium 2-mercaptoethanesulfonate, and finally emulsifying to obtain a fiber treating agent; s3, (1) performing opening mixing, cotton carding, drawing, roving, spinning and spooling on the linen fibers and the wear-resistant fibers in sequence to obtain a linen blended yarn crude product; and (2) soaking the flax blended yarn crude product into the fiber treating agent, padding and drying to obtain the wear-resistant antibacterial flax blended yarn.

The invention relates to the technical field of adhesives, in particular to a UV-thermal dual-curing adhesive and a preparation method thereof. The UV-thermal dual-curing adhesive provided by the invention comprises the following components in parts by weight: 10-30 parts of an acrylate monomer; 5-15 parts of epoxy resin; 5 to 15 parts of epoxy modified N substituted maleimide resin; 1-4 parts of a photoinitiator; 10-25 parts of a latent curing agent; 0.5-2 parts of a stabilizer; 15 to 30 parts of thiol; 1-3 parts of a silane coupling agent; 1-5 parts of a thixotropic agent; and 15-30 parts of a filler. By adding the epoxy modified N-substituted maleimide resin, on one hand, excellent flexibility can be brought to a system; on the other hand, the maleimide ring can enable the system to have excellent humidity and heat resistance, and the prepared adhesive can be applied to adhesion of camera modules in various application scenes.

The invention relates to the field of sealing strips, and discloses a low-VOC (volatile organic compound) automobile sealing strip composite PVC (polyvinyl chloride) material and a preparation method thereof, the material comprises PVC resin, ethylene propylene diene monomer, a modified mesoporous ZIF-8 nano material, composite filler and the like; the modified mesoporous ZIF-8 nano material is prepared by grafting a hydroxylated antioxidant component on the surface of the mesoporous ZIF-8 nano material by using isophorone diisocyanate, and the hydroxylated antioxidant component is prepared by reacting N-(4-anilinophenyl) maleimide with 2-mercaptoethanol; the composite filler is prepared by grafting modified nano silicon dioxide and aminated basalt fiber, the modified nano silicon dioxide is prepared from phenylphosphoryl dichloride, diethanol amine, dibutyl phosphate and isophorone diisocyanate as raw materials, and the aminated basalt fiber is prepared by modifying with an aminated silane coupling agent; the modified mesoporous ZIF-8 nano material and the composite filler are added, so that the flame retardant property, the thermal aging resistance and the mechanical property of the material are improved.

The invention discloses a modified maleimide prepolymer, a resin composition and application thereof, the modified maleimide prepolymer is an amine compound modified maleimide prepolymer and is generated by a prepolymerization reaction of maleimide resin and an amine compound, and the weight ratio of the maleimide resin to the amine compound is 100: (1-120); according to the invention, the maleimide resin is modified by a compound containing a special aliphatic ring and aromatic amine structure, and due to the existence of the aliphatic ring or olefin structure, the dielectric property, the water absorption rate and the like of bismaleimide can be reduced; the structure has an excellent thermal expansion coefficient and can meet the requirement of high-order packaging; according to the present invention, the product has characteristics of high temperature resistance, no volatile low molecular substance generation during the reaction process, stable molecular structure and high thermal decomposition temperature, can completely meet the multi-chip assembly manufacturing process requirements in the large-scale integrated circuit, and can obtain the cured product with characteristics of high heat resistance, high toughness, low CTE, low dielectric property and low water absorption rate, and the obtained cured product has characteristics of high heat resistance, high toughness, low CTE, low dielectric property and low water absorption.

The invention belongs to the technical field of insulation and heat dissipation coatings, and particularly relates to an insulation and heat dissipation coating composition for a lithium battery and a preparation method of the insulation and heat dissipation coating composition. The insulating heat dissipation coating composition is prepared from the following raw materials: modified epoxy resin, heat conduction filler, a defoaming agent, a flatting agent, a curing agent and a solvent, a preparation method of the modified epoxy resin comprises the following steps: firstly, preparing fluorinated silane by utilizing an epoxy compound to perform ring-opening reaction and esterification reaction, and then preparing the modified epoxy resin by taking the fluorinated silane, bismaleimide and bisphenol A epoxy resin as raw materials through chain extension reaction. According to the invention, the modified epoxy resin, the heat-conducting filler and other raw materials are compounded, and the prepared coating composition has excellent weather resistance, heat and humidity resistance, wear resistance and chemical corrosion resistance by adjusting the raw material ratio and optimizing the process conditions, and also keeps good adhesive force, impact resistance, heat dissipation and insulativity at the same time.

The present invention relates to VHH antibodies that specifically bind to components of nuclear pore complexes of human cells and other species. Further, the present invention relates to the labelling of VHH antibodies through maleimide chemistry and ectopic cysteine residues. Further, the present invention relates to a method for forming a stabilizing, structural disulfide bond in initially reduced VHH antibodies.

The invention relates to an anti-yellowing automobile composite film and a preparation method thereof, and belongs to the technical field of high polymer materials. The yellow-resistant automobile composite film is prepared from the following components in parts by weight: 60 to 70 parts of PVC (Polyvinyl Chloride) master batch, 10 to 20 parts of TPU (Thermoplastic Polyurethane) master batch, 1 to 2 parts of plasticizer, 0.5 to 0.8 part of flatting agent, 0.1 to 2 parts of yellowing-resistant modifier and 0.1 to 2 parts of modified flame retardant, sym-triazine cyanuric chloride and a benzotriazole intermediate in the anti-yellowing modifier absorb ultraviolet rays and reduce yellowing of the ultraviolet rays on the composite material, and maleimide groups, maleic anhydride and isocyanurate rings for increasing the crosslinking density cooperate with one another, so that the heat resistance of the material is improved, and the yellowing is reduced; phosphorus and nitrogen main chains of phosphonitrilic chloride trimer in the modified flame retardant have a conjugation effect, so that a protective film is formed, oxygen is isolated, and the phosphonitrilic chloride trimer and nitrogen are synergistically flame-retardant; the anti-yellowing automobile composite film prepared by the invention not only has excellent ultraviolet absorption performance, heat resistance and anti-yellowing effects, but also has a good flame retardant effect.

The invention discloses a flame-retardant ABS (Acrylonitrile Butadiene Styrene) composition as well as a preparation method and application thereof, and relates to the technical field of high polymer materials. The flame-retardant ABS composition provided by the invention comprises the following components in parts by mass: 50-80 parts of ABS resin; 8 to 12 parts of styrene-acrylonitrile copolymer; 3 to 5 parts of styrene-acrylonitrile-maleic anhydride terpolymer; 2 to 6 parts of a fluorine-containing maleimide copolymer; 5 to 15 parts of graphite nanosheet modified high rubber powder; 12 to 18 parts of brominated flame retardant; 3-7 parts of a phosphorus-based flame retardant; 0.1-1 part of a processing aid; the phosphorus-based flame retardant is prepared from the following components in parts by mass: 80 to 95 parts of diethyl phosphinate; 0.3 to 3 parts of ethyl butyl phosphinate; 0.1 to 2 parts of ethyl phosphonate; and 5 to 20 parts of melamine polyphosphate. The flame-retardant ABS composition prepared by the invention is good in flame retardant property, good in welding strength and low in cost.

The invention provides a resin composition, a prepreg containing the resin composition, a copper-clad plate and a printed circuit board. The resin composition is prepared from the following raw materials in parts by weight: 30-50 parts of a maleimide compound, 20-40 parts of polyphenyl ether resin, 10-20 parts of a cross-linking agent, 5-15 parts of a reactive phosphorus-containing flame retardant and 60-150 parts of an inorganic filler, wherein the total weight part of the maleimide compound, the polyphenyl ether resin, the cross-linking agent and the reactive phosphorus-containing flame retardant is 100 parts, and the resin composition is prepared from the following components in parts by weight: 30-50 parts of the maleimide compound, 20-40 parts of the polyphenyl ether resin, 10-20 parts of the cross-linking agent, 5-15 parts of the reactive phosphorus-containing flame retardant and 60-150 parts of the inorganic filler. The resin composition provided by the invention realizes the characteristics of halogen-free flame retardance and low dielectric loss, can well balance the dielectric property, low thermal expansion and high heat resistance, and has excellent comprehensive performance.

Disclosed are lipid nanoparticle (LNP) delivery systems that specifically target T cells. The LNP delivery system comprises antibodies conjugated to the surface of the LNP, e.g., via maleimide chemistry, that target at least two T cell surface proteins, e.g., CD3 and CD28. The LNP delivery system can have a single population of LNP conjugated to either a bispecific antiCD3 / antiCD28 antibody, or two monospecific antiCD3 and antiCD28 antibodies, or two populations of LNP wherein each population comprises a monospecific antibody. The payload of the LNP delivery system can be, e.g., mRNA encoding chimeric antigen receptors (CAR), a linear DNA fragment or a plasmid encoding chimeric antigen receptors (CAR) or therapeutic proteins such as antibodies, components of a gene editing systems (e.g., CRISPR-Cas), small molecules, antibody-drug conjugates (ADC), and any combination thereof, either encapsulated in the LNP or attached to its surface (e.g., conjugated). Also provided are lipids, pharmaceutical compositions, kits, and methods of treatment.

The invention discloses a CNT-based antistatic MPPE composite material and a preparation method thereof, the composite material comprises the following raw materials by weight: 40-50 parts of modified polyphenyl ether, 40-50 parts of modified polystyrene, 10-15 parts of modified carbon nanotubes and 1-1.5 parts of zinc oxide, the modified carbon nanotubes are added into the composite filler, and the modified carbon nanotubes have a good conductive effect, so that the antistatic performance of the composite material is improved. And when the modified polyphenyl ether, the modified polystyrene, the modified carbon nanotubes and the zinc oxide are subjected to melt blending, under the action of the zinc oxide, the modified polyphenyl ether and the modified polystyrene are compounded and can be subjected to a DA reaction with maleimide on the modified carbon nanotubes to form dynamic crosslinking, so that the antistatic effect of the composite material is improved. Dynamic crosslinking can absorb and disperse energy when the composite material is impacted, and enables a molecular chain segment to generate greater motion when the composite material is impacted, so that deformation of the material is facilitated without breakage.

The invention relates to an outdoor anti-aging PP plate and a preparation method thereof, and belongs to the technical field of high polymer materials. The outdoor anti-aging PP plate comprises the following components in parts by weight: 40-80 parts of PP resin, 10-20 parts of glass fibers, 1-5 parts of an anti-aging modifier, 0.2-3 parts of a modified flame retardant, 0.1-1 part of a lubricant and 0.1-0.5 part of an antioxidant, hydroxybenzophenone in the modified anti-aging agent generates thermal vibration and releases energy when absorbing ultraviolet rays and being irradiated by the ultraviolet rays, and cooperates with butyltrimethoxysilane to protect the material from being damaged by the ultraviolet rays, and a maleimide group improves the glass transition temperature and the melting point and reduces the influence of high-temperature thermal aging; a B-O-C carbon layer is formed at a high temperature under the synergistic effect of boron and phosphorus of the modified flame retardant, flame-retardant gas is released, and the modified flame retardant and phosphorus-oxygen double bonds are synergistically flame-retardant, so that the flame-retardant property is remarkably improved; the outdoor anti-aging PP plate prepared by the invention not only has excellent anti-aging performance, but also has a good flame-retardant effect.

The invention belongs to the technical field of lithium metal batteries, and relates to the technical field of artificial SEI layers, in particular to a dynamic self-adaptive polymer artificial SEI layer based on a DA bond and preparation and application thereof. Linear polyurethane serves as a framework, a dynamic DA bond is introduced into a polymer system, a topological network structure is formed through in-situ reaction of the linear polyurethane and bismaleimide on the surface of a lithium metal negative electrode, and therefore the artificial SEI layer based on the DA bond is prepared. The artificial SEI layer is a three-dimensional topological structure polymer material with a dynamic adaptive characteristic. A DA dynamic covalent bond and a hydrogen bond introduced into the structure endow the artificial protection layer with excellent mechanical properties and dynamic characteristics, so that the artificial protection layer can adapt to the volume change of a lithium metal negative electrode in a battery cycle process, thereby realizing long-term stability of the electrode, and remarkably improving the safety and electrochemical performance of the lithium metal battery. Therefore, the invention provides an innovative method for preparing the novel artificial SEI layer.

The invention relates to a flame-retardant rubber and plastic thermal insulation material and a preparation method thereof, and belongs to the technical field of high polymer materials. The flame-retardant rubber-plastic thermal insulation material comprises the following components in parts by weight: 50-75 parts of nitrile rubber, 20-45 parts of PVC resin, 10-15 parts of a plasticizer, 1-10 parts of a foaming agent, 1-5 parts of a foaming promoter, 10-40 parts of a composite flame retardant and 2-6 parts of a modified anti-aging agent, cyclohexanehexol phosphate in the composite flame retardant is heated and dehydrated into phosphoric acid, a barrier layer is formed to inhibit release of combustible materials, and dimethylallylamine combusts to absorb heat and cooperates with phosphorus-oxygen double bonds for flame retardance; a pre-product in the modified anti-aging agent reacts with a free radical of a rubber molecular chain, so that the heat resistance and the aging resistance of the material are improved, a maleimide group enhances an intermolecular acting force, the rigidity and the heat resistance of the molecular chain are improved, and material aging caused by high temperature is reduced; the flame-retardant rubber and plastic thermal insulation material prepared by the invention not only has an excellent anti-aging effect, but also has good flame retardance.

The invention discloses a phase change thermal interface material with interface adaptability and a preparation method thereof. The phase-change thermal interface material with interface adaptability is prepared from the following raw materials: a phase-change matrix premix, a grafting agent, a cross-linking agent, an initiator and a heat-conducting filler, the phase-change matrix premix comprises stearic acid and a polyolefin elastomer, the mass ratio of the stearic acid to the polyolefin elastomer is (6-8): (2-4), and the grafting agent is a crosslinking agent. The grafting agent is borane dioxide maleimide, and the cross-linking agent is diborane dioxide. The phase change material stearic acid is added into the thermal interface material, the problem of instantaneous high heat flux thermal shock caused by high heat flux to an electronic device can be effectively relieved through instantaneous heat absorption during solid-liquid phase change of the stearic acid, and the modulus of the phase change thermal interface material is reduced through solid-liquid phase conversion; therefore, the contact thermal resistance between a heat source and the radiator can be reduced to the greatest extent in the mechanical installation process.

The invention discloses a polyphenyl ether resin composition and application thereof. The polyphenyl ether resin composition comprises the following components in parts by solid weight: 20-75 parts by weight of maleimide resin or maleimide prepolymer; 10-60 parts by weight of a polyphenylene ether resin; 5-50 parts by weight of hydrocarbon resin; the maleimide resin or the maleimide prepolymer contains a limited structural unit. Compared with the prior art, the polyphenyl ether resin composition and the application thereof have the advantages that the maleimide resin or the maleimide prepolymer containing the styrene structural unit is matched with the polyphenyl ether resin and the hydrocarbon resin, so that the compatibility among the components of the polyphenyl ether resin can be improved, the dielectric constant Dk and the dielectric loss tangent Df are reduced, and the toughness is improved; the warping of the plate is improved, the excellent heat resistance is kept, and the excellent comprehensive performance is achieved.

The invention relates to the technical field of fracturing fluids, and particularly discloses a high-performance water-based fracturing fluid and a preparation method thereof. A preparation method of a high-performance water-based fracturing fluid comprises the following steps: 1) dissolving a compound as shown in a formula I in a solvent, then adding a cyclodextrin derivative and hydroxyproline, mixing, then adding tetrabutylphosphorus hydroxide, and continuously and uniformly mixing to prepare a precursor solution; (2) adding a compound as shown in a formula II into the precursor solution, mixing, reacting, then adding maleimide or a maleimide derivative, heating to 60-70 DEG C, and continuously reacting for 2.5-4 hours to obtain a precursor; and 3) uniformly mixing water and guanidine gum to prepare a base solution, adding the cross-linking agent, the precursor, the clay stabilizer, the gel breaker, the bactericide and the pH regulator in a stirring state, and uniformly mixing to obtain the high-performance water-based fracturing fluid. The prepared high-performance water-based fracturing fluid has the advantages of thorough gel breaking and small solid-phase damage.

According to the method for recycling the waste lithium ion battery positive electrode material aluminum foil, double-bond addition is conducted on ureido of allylurea and maleimide, meanwhile, thiazolecarboxylic acid amino cyclization is conducted, ternary heterocyclic molecules containing ureido, thiazole rings and carboxyl are generated, S atoms, N atoms and O atoms form tridentate coordination sites, and the leaching rate of aluminum is increased.

Linkers for linking a therapeutic agent to other moieties, such as an Fc region of an antibody. A linker having two or more maleimide functional groups, which may be subjected to a nucleophilic conjugate addition reaction. A method for increasing the duration of action of a therapeutic agent by linking a novel linker to the Fc region of an antibody. Antibody drug conjugates having a longer duration of action than the drug alone.

The invention discloses high-heat-resistance epoxy modified bismaleimide resin as well as a preparation method and prepreg thereof, and relates to the technical field of thermosetting resin. The resin comprises the following raw materials in parts by weight: 30-60 parts of bismaleimide monomer resin, 10-30 parts of polyfunctional epoxy resin and 20-40 parts of an allyl mixture, the bismaleimide monomer resin at least comprises special bismaleimide monomer resin with a structural formula and / or a structural formula; the allyl mixture at least comprises 1, 2-bis (4-(allyloxy) phenyl) disulfane. The structural heat resistance can be effectively improved by specifically selecting the component raw materials and limiting the dosage, aggregation and accumulation of polymer chains are promoted, and the crosslinking density of the bismaleimide resin is further improved. Meanwhile, the curing temperature of the bismaleimide resin is obviously reduced to 190 DEG C, so that the problems of high manufacturing cost, long curing period and the like of the bismaleimide resin are solved, the dimensional stability of a bismaleimide composite material product can be improved, and the dimensional precision is improved.

The invention relates to the technical field of crosslinked polyethylene insulated power cables, in particular to a flame-retardant and insulated low-voltage power cable and a preparation method and application thereof. The flame-retardant and insulating low-voltage power cable comprises the inner core layer, the filler layer, the belting layer, the lining layer, the metal armor layer and the outer sheath layer from inside to outside, and the multiple layers can effectively protect the inner core and endow the cable with better performance; in addition, low-density polyethylene, a furan modified polyethylene compatilizer, a reactive flame retardant, bismaleimide, dicumyl peroxide and an auxiliary are adopted to obtain the cross-linked polyethylene material for the cable outer sheath, and the cross-linked polyethylene material has excellent insulation, flame retardance, strength, toughness and repairing performance.

The invention relates to the technical field of aerogel, in particular to flexible flame-retardant aerogel and a preparation method thereof.The flexible flame-retardant aerogel is prepared from modified graphene, modified polyvinyl alcohol, silver nanowires, phytic acid and epoxy resin E-51; the furan group is introduced into the aerogel through the modified graphene, the furan group and the maleimide group are subjected to a D-A reaction, an adhesive is prevented from being used when the aerogel is bonded with a screen backboard, the D-A reaction is reversible, and lossless reworking can be realized. PVA and epoxy resin E-51 are added together, so that the heat resistance and mechanical strength of the material are improved. PVA is grafted with a large-steric-hindrance amine group, weak interaction with a furan group is generated, side reaction with an epoxy group of epoxy resin E-51 is avoided, and when aerogel is bonded to an OLED screen backboard, the protective layer is reversibly released, so that D-A reaction can be smoothly carried out. The hydrophobic treatment of the modified graphene and the modified grafting of the polyethylene to the mPEG can effectively improve the agglomeration of the modified graphene and ensure the uniform dispersion of the modified graphene.

The invention relates to the technical field of coatings, in particular to an acrylate-epoxy resin composite coating and a preparation method thereof. According to the technical scheme, the coating is prepared from 25 to 35 parts of methyl methacrylate, 15 to 25 parts of butyl acrylate, 10 to 20 parts of epoxy resin E-5110, 8 to 15 parts of organic silicon modified acrylate prepolymer, 5 to 12 parts of fluorocarbon modified epoxy resin, 4 to 8 parts of core-shell structure corrosion inhibition nano container, 1 to 3 parts of functionalized graphene quantum dots and 4 to 10 parts of polyhedral oligomeric silsesquioxane maleimide modified amine curing agent. And 1-3 parts of a hindered amine light stabilizer. By integrating the core-shell structure corrosion inhibition nano container, the functionalized graphene quantum dots and the photo-thermal dual responsive curing agent component, the sensing, response and self-repairing of the coating on damage are realized, and long-acting corrosion resistance, weather resistance, bacteria resistance, mechanical property balance and intelligent maintenance are considered; and efficient and economical full-period protection is provided for equipment in an extreme environment.

A resin composition, a prepreg and a preparation method therefor, and a laminate and a preparation method therefor. The resin composition comprises the following raw materials in parts by mass: 20-50 parts of a modified bismaleimide prepolymer, 10-40 parts of cyanate ester resin, 30-60 parts of functional resin, and 50-200 parts of an inorganic filler, wherein raw materials of the modified bismaleimide prepolymer include bismaleimide resin and a modifier, and the modifier comprises tripolynaphthalene diallyl ether. A cured product of the resin composition has an extremely low coefficient of thermal expansion, excellent high-temperature modulus retention and extremely high heat resistance, also shows excellent dielectric properties, and is thus suitable for preparing high-performance semiconductor packaging substrates.

The present disclosure provides a thermosetting resin composition contributing to reducing the elastic modulus of a cured product and increasing the flexibility thereof while reducing the chances of causing a decline in the heat resistance of the cured product. A thermosetting resin composition contains: a maleimide compound (A) having at least two maleimide groups in one molecule; a compound (B) having, at either or both of terminals thereof, a substituent with an ethylenic unsaturated bond and having a polyphenylene ether skeleton; and an inorganic filler (C). The compound (B) includes a compound (B1) having a butadiene-derived structural unit.

The invention discloses a low-dielectric and high-peel-strength hydrocarbon resin as shown in a formula (3), a composition for a copper-clad plate and a preparation method of the composition. The preparation method is characterized in that divinyl benzene and a phenolic compound containing double bonds are subjected to a polymerization reaction in the presence of a free radical initiator, a polymerization inhibitor and a solvent to obtain the low-dielectric and high-peel-strength hydrocarbon resin; the resin composition for the copper-clad plate is prepared by uniformly mixing 100 parts by mass of hydrocarbon resin with low dielectric and high peel strength, 10-20 parts by mass of maleimide resin, 0.1-0.5 part by mass of an initiator, 0.1-0.5 part by mass of an antioxidant, 60-80 parts by mass of filler and 70-140 parts by mass of a solvent at the temperature of 30-50 DEG C. The composition for the low-dielectric and high-peel-strength hydrocarbon resin and the copper-clad plate has the characteristics of high peel strength, low dielectric constant, low dielectric loss and the like, is good in product performance, and is suitable for the fields of artificial intelligence, 5G base stations, power amplifiers, automobile radars and the like. # imgabs0 #

The invention discloses a high-impact material prepared from recycled polypropylene and a preparation method of the high-impact material, and relates to the field of materials. When recycled polypropylene is used for preparing the high-impact material, firstly, polypropylene is grafted with vinyl diphenylphosphine, then the grafted polypropylene is reacted with 1-(3-chlorphenyl)-2-propyn-1-ol, and then the reacted polypropylene is reacted with 6-(methyl formate) pyridine-3-boric acid to obtain modified polypropylene; secondly, the calcium carbonate pretreated by 3-aminopropyltrimethoxysilane reacts with 3-thiophenecarboxaldehyde, thiophene, 6-(thiophene-2-yl) pyridine-2-carboxylic acid and 6-(3-thienyl) pyridine-2-formaldehyde are polymerized on the surface of the calcium carbonate, and modified calcium carbonate is obtained; and finally, carrying out melt blending on recycled polypropylene, modified polypropylene, modified calcium carbonate, sodium cyanide and bismaleimide, and carrying out extrusion granulation to obtain the high-impact material. The high-impact material prepared by the invention has good impact resistance, aging resistance and antibacterial property.

The invention relates to a negative pole piece, a preparation method thereof and a secondary battery. The negative pole piece comprises a negative current collector; the first active material layer is arranged on at least one side surface of the negative electrode current collector; the second active material layer is arranged on the surface of one side, far away from the negative electrode current collector, of the first active material layer; the first active substance layer comprises a first active material coated by a first modified polymer, and the second active substance layer comprises a second active material coated by a second modified polymer; one of the first modified polymer and the second modified polymer includes at least a furan group, and the other includes at least a maleimide group. According to the negative pole piece provided by the invention, a self-repairable polymer molecule is formed by utilizing a DA reaction between furan and maleimide, so that the interlayer stripping force in the later cycle period is recovered, the coating falling is reduced, and the cycle capacity retention rate is improved.

The invention provides ZrB2 / SiC / TiB2 ultrahigh-temperature ceramic and a preparation method thereof, and belongs to the field of ultrahigh-temperature ceramic. The preparation method comprises the following steps: preparing SiC / TiB2 composite particles, modifying and compounding the SiC / TiB2 composite particles, preparing ceramic slurry, forming and calcining. The compounding step comprises the following steps: putting modified SiC / TiB2 composite particles and modified ZrB2 particles into N-methyl pyrrolidone, uniformly stirring, adding 4, 4 '-bismaleimide diphenylmethane, and stirring at 110-115 DEG C for 2.8-3.2 hours to obtain ZrB2 / SiC / TiB2 particles; the ceramic product prepared by the invention is high in interface bonding strength, uniform in internal structure, relatively high in toughness and strength, good in temperature resistance, stable in overall performance and excellent in comprehensive performance.