15results about How to "Enhance the interface force" patented technology

The invention relates to the technical field of nylon 6, and discloses a carbon nanotube grafted ABS modified nylon 6 composite material, acylating chlorinated carbon nanotubes and lysine are subjected to an amidation reaction, double bonds on ABS and double bonds on maleic anhydride are combined, anhydride modified ABS and amino modified carbon nanotubes are subjected to a ring-opening reaction, and the carbon nanotube grafted ABS modified nylon 6 composite material is obtained. The carbon nanotubes are grafted to the ABS, agglomeration of the carbon nanotubes is avoided, the carbon nanotubes can form a uniform network structure under the action of external force, a large amount of external force is absorbed, the toughness of a matrix is improved, a large amount of carboxyl introduced to the surface of the ABS plastic and amide groups in the nylon 6 matrix are subjected to hydrogen-bond interaction, a three-dimensional hydrogen-bond network is formed, and the toughness of the matrix is improved. According to the present invention, the compatibility and the interfacial force between the nylon 6 and the carbon nano-tube grafted ABS are improved, such that the nylon 6 and the carbon nano-tube grafted ABS can be uniformly distributed so as to form the sea island structure, and can buffer more stress effects under the action of the external force, such that the obtained composite material has excellent toughness.

The invention discloses a method for improving the comprehensive performance of a PLA / PBS blended material by using a compatilizer, and belongs to a preparation method of a biodegradable material. The method comprises the following steps: adding a PLA / PBS blending system into a twin-screw extruder according to a certain mass ratio for melt blending, and adding a compatilizer, an antioxidant and an initiator to improve the compatibility between PLA and PBS. Epoxy groups in the compatilizer can chemically react with hydroxyl groups in PLA and PBS to form chemical bonding, so that the mechanical property and the optical property of the material are remarkably improved. The prepared composite material has excellent mechanical, processing and optical properties, and the preparation process is simple and convenient to operate. The innovative technology is very suitable for large-scale industrial production, has remarkable economic benefits and wide application prospects, and provides a new technical route for promoting the development of the field of biodegradable materials.

The invention relates to the technical field of polypropylene, and discloses a high-strength impact-resistant modified polypropylene plastic and application thereof in durable toys, the high-strength impact-resistant modified polypropylene plastic comprises 100 parts by weight of polypropylene, 10-30 parts by weight of hyperbranched polyurethane elastomer, 2-8 parts by weight of a filler, and 0.3-0.5 part by weight of an antioxidant; the hyperbranched polyurethane elastomer contains an alkyl long chain with good compatibility with polypropylene, and meanwhile, in the high-temperature melt extrusion process, the alkyl long chain and a polypropylene molecular chain form a physical chain winding effect, so that the compatibility between the polyurethane elastomer and the polypropylene is remarkably improved, and the interfacial force between the polyurethane elastomer and the polypropylene is improved; the hyperbranched polyurethane elastomer has a better toughening effect, and the tensile property, the bending strength and the impact strength are obviously improved.

The invention relates to the technical field of carbon fiber material synthesis, in particular to a preparation method of an environment-friendly self-emulsifying epoxy vinyl carbon fiber sizing agent. According to the preparation method of the environment-friendly self-emulsifying epoxy vinyl carbon fiber sizing agent, a high-molecular polymer with a self-emulsifying function is prepared firstly, then water is added into the high-molecular polymer for self-emulsifying to prepare the carbon fiber sizing agent, and the molecular structure of the sizing agent contains epoxy groups, amino groups and more carbon-carbon double bonds; the groups are compounded with the epoxy resin to participate in the curing reaction of the epoxy resin to form relatively strong connection, so that the interfacial force of the carbon fiber reinforced epoxy resin is improved; meanwhile, unsaturated carbon-carbon double bonds in the structure can participate in the curing reaction of the vinyl resin, so that the interfacial acting force between the carbon fibers and the vinyl resin is remarkably improved, strong chemical connection of an interfacial layer is realized, and the comprehensive mechanical property of the carbon fiber reinforced vinyl composite material is favorably improved.

This invention relates to a method for preparing integrated high thermal conductivity layered material silicone rubber gaskets for heat dissipation in electronic packaging based on peeling. The method involves mixing polydopamine-modified boron nitride or graphite powder, silicone rubber, a silane coupling agent, and a bis(2,5)-pentachlor vulcanizing agent in a three-roll mill. By reducing the roller spacing and extending the mixing time, the boron nitride or graphite powder is peeled off within the composite material under the shear force of the rollers. The resulting mixture is placed in a metal mold and subjected to vacuum hot-pressing vulcanization, followed by a secondary vulcanization, to obtain a high thermal conductivity silicone rubber gasket for heat dissipation in electronic packaging. This method has broad application prospects in the fields of electronic packaging and thermal management.

The invention relates to the field of road engineering materials, and particularly discloses an environment-friendly rubber asphalt material prepared by synergism of multiple solid wastes and a preparation process of the environment-friendly rubber asphalt material. The environment-friendly rubber asphalt material is prepared from the following raw materials in parts by weight: 100 to 140 parts of elastomer modified asphalt, 15 to 25 parts of waste rubber powder, 0.5 to 1 part of SBR (Styrene Butadiene Rubber), 1 to 3 parts of a stabilizer, 1.5 to 3 parts of an anti-stripping agent, 30 to 50 parts of multi-solid waste ceramsite, 10 to 14 parts of aromatic oil and 5 to 15 parts of a tackifier. The waste rubber powder is prepared by mixing and crushing waste tires and ethylene propylene diene monomer, the multiple solid waste ceramsite is prepared by granulating, drying, preheating and sintering a wet material formed by adding water into solid waste raw materials, and the solid waste raw materials comprise copper tailings, household garbage incineration fly ash, dolomitic tailings and wood chips. The rubber asphalt material disclosed by the invention has the advantages of high water permeability, high mechanical strength and freezing and thawing resistance due to the ceramsite prepared from various solid waste materials.

The invention discloses a high-temperature-resistant asphalt mixture and a preparation method thereof, and relates to the technical field of asphalt mixtures. The preparation method comprises the following steps: firstly, grafting sodium lignin sulfonate and chitosan onto basalt fibers, adsorbing nano metal particles, and then adding into nitrile rubber to prepare a composite filler; the basalt grafted with the sodium lignin sulfonate improves the dispersity, and serves as a hard framework to support the rubber to form a three-dimensional structure; nano metal copper particles are adsorbed on basalt fibers through chelation by utilizing chitosan, so that crosslinking of rubber molecular chains caused by free radicals is inhibited; secondly, grafting maleic anhydride on the composite filler, and cooperatively modifying asphalt with diatomite to prepare an asphalt mixture; the added diatomite can be subjected to a cross-linking reaction with the asphalt and is combined with the composite filler to form stable blending; on the basis, the grafted maleic anhydride not only reduces the problem of overhigh viscosity, but also improves the bonding effect so as to achieve higher stability. The prepared asphalt mixture has a high-temperature-resistant effect.

The invention relates to the field of refining and application of wood fiber biomass, and discloses a lignin-based formaldehyde-free adhesive, a lignin-based plywood and a preparation method and application of the lignin-based formaldehyde-free adhesive and the lignin-based plywood. The lignin-based formaldehyde-free adhesive disclosed by the invention comprises the following components: L-cysteine lignin, and the solid content of the lignin-based formaldehyde-free adhesive is 10-45wt%. The method comprises the following steps: mixing an aqueous solution of L-cysteine hydrochloride and lactic acid with raw materials for pretreatment; performing extraction and vacuum filtration on the obtained suspension to obtain dissolved lignin and hemicellulose filtrate, and performing extraction and purification on the filtrate to obtain L-cysteine lignin; the lignin-based formaldehyde-free adhesive is prepared by uniformly dispersing the L-cysteine lignin in water. According to the invention, the used solvent is green and nontoxic in source, the hydrated lignin-based adhesive with good fluidity is prepared with low solid content, and the prepared plywood shows excellent dry and wet bonding strength, solvent resistance and weather resistance, and meets the preparation requirements of national I-class plywood.

The invention discloses a low-noise PA6 composite material and a preparation method thereof, the PA6 composite material is prepared from the following raw materials in parts by mass: 40-90 parts of PA6 resin, 1-6 parts of a noise reduction auxiliary agent, 0.1-1 part of an antioxidant, 0.1-1 part of a lubricant and 0-60 parts of glass fibers, and the noise reduction auxiliary agent is porous graphite. The pore structure of the porous graphite can enhance the interface bonding force with the PA6 base material, and the compression resilience can help the PA6 base material to disperse stress and reduce stress concentration when the PA6 base material is subjected to external force, so that the surface abrasion phenomenon of the composite material is reduced, and noise is reduced. And after the porous graphite is subjected to graft modification treatment by the polyether chain segment, the stability is improved, the flexibility and fluidity of the molecular chain of the material are also improved by introducing the flexible chain segment, the friction property of the material is reduced, and the service life of the low-noise PA6 composite material is further prolonged.

This invention belongs to the field of high-performance fiber composite materials technology, specifically relating to a method for preparing low-dielectric ramie fiber reinforced polycarbonate composite materials. First, ramie fibers with acrylate-type double bonds modified on their surface are prepared. Then, poly(styrene-isoprene) modified ramie fibers are prepared by copolymerizing the acrylate-type ramie fibers with styrene and isoprene. Next, polyphenylene ether and the poly(styrene-isoprene) modified ramie fibers are mixed evenly and added to a hopper. A polyphenylene ether / ramie fiber alloy is prepared using a twin-screw extruder. Finally, the polyphenylene ether / ramie fiber alloy is mixed evenly with polycarbonate and added to a hopper. A low-dielectric ramie fiber reinforced polycarbonate composite material is prepared using a twin-screw extruder. The molecular weight of the modified ramie fiber polymer is adjustable, as is the ratio of styrene to isoprene. The polystyrene segments effectively improve the compatibility between ramie fibers and polyphenylene ether, while the polyisoprene segments effectively enhance the toughness of the polyphenylene ether / ramie fiber alloy.

The invention discloses a polydicyclopentadiene material and a preparation method thereof, and belongs to the technical field of polymer-based composite materials, the polydicyclopentadiene material comprises the following raw materials by weight: 130-140 parts of dicyclopentadiene, 6.5-7 parts of vinyl polysiloxane borane, 6.5-7 parts of silane coupling agent modified montmorillonite, 0.4 part of a main catalyst, 0.8 part of a co-catalyst and 1 part of a retarder, the preparation method comprises the following steps: mixing dicyclopentadiene, a modified montmorillonite supported catalyst and vinyl polysiloxane borane to obtain a component A; mixing dicyclopentadiene, vinyl polysiloxane borane, a cocatalyst and a retarder to obtain a component B; and mixing the component A and the component B, injecting the mixture into a mold, and carrying out heat preservation molding to obtain the polydicyclopentadiene material. By adding the silane coupling agent modified montmorillonite and the vinyl polysiloxane borane, the flame retardant grade of the material reaches V-0, and the performance of the material can be improved by controlling the proportion of different raw materials.

This invention relates to the field of composite fiber technology, specifically to a graphene-modified polyamide 6 composite fiber and its preparation method. The composite fiber of this application is obtained by adding chlorinated modified graphene to polyamide 6, followed by compounding and molding. The preparation method of the chlorinated modified graphene includes the following steps: coating graphene oxide with silica; subjecting the silica-coated graphene oxide to acylchlorination treatment, then grafting L-glutamic acid; modifying the grafted graphene with 5,5-dimethyl-3-(3'-triethoxysilylpropyl)hydantoin to obtain modified graphene; and chlorinating the modified graphene with sodium hypochlorite to obtain chlorinated modified graphene. The composite fiber of this application has advantages such as high tensile strength and good antibacterial effect.

This invention discloses a branched vinylphenyl polysiloxane and its preparation method, comprising the following steps: mixing vinyl difunctional chain silane monomers, phenyl difunctional chain silane monomers, alkyl difunctional chain silane monomers, a solid acid catalyst, and acetic acid in a certain proportion, and performing a reflux reaction; filtering out the solid acid catalyst by cooling to obtain a first filtrate, and distilling it at atmospheric pressure to obtain a polysiloxane precursor; adding a trifunctional chain silane monomer, a capping agent, acetic acid, and a solid acid catalyst to the polysiloxane precursor, and reacting; filtering out the solid acid catalyst to obtain a second filtrate, and distilling it at atmospheric pressure to obtain a branched vinylphenyl polysiloxane with a vinyl content of 1.0~3.0% and a silanol content ≤0.1%. It can be used for surface modification of fillers in addition silicone rubber systems to improve the mechanical properties and system compatibility of materials, and solve the problems of few modified active sites and weak interfacial forces, as well as the problem that high silanol content affects the curing and adhesion of addition systems.

The present application provides an epoxy resin composition, a preparation method and application thereof, and raw materials of the epoxy resin composition include an epoxy resin, a curing agent and a modified lignin epoxy resin. The modified lignin epoxy resin is used to replace part of the traditional epoxy resin to prepare the epoxy resin composition, which can enhance the compatibility between the lignin and the epoxy resin matrix, and the interfacial force between the lignin and the epoxy resin, utilize the chemical structure characteristics of the lignin itself, enhance the tensile strength of the epoxy resin composition, on the other hand, through enhancing the interfacial adhesion between the epoxy resin composition and the substrate (especially the copper substrate), such as hydrogen bond effect, etc., the adhesion performance of the epoxy resin composition is improved.

The invention relates to a preparation method of a toughened polylactic acid nanofiber electrostatic spinning membrane, which comprises the following steps: (1) adding an elastic component monomer, lactic acid and cellulose into deionized water, heating and stirring to obtain a compatibilizer; (2) adding the compatibilizer, the elastic component and the polylactic acid in the step (1) into an organic solvent, stirring, dissolving and uniformly mixing to obtain a spinning solution; and (3) carrying out electrostatic spinning on the spinning solution to obtain the toughened polylactic acid nanofiber electrostatic spinning membrane. The preparation method is simple, the defect that the polylactic acid material is too large in brittleness is overcome, and the obtained nanofiber electrostatic spinning membrane has better toughness, elastic recovery performance and fatigue resistance.