17 results about "Rubber toughening" patented technology

The invention relates to the technical field of conveying belts, discloses an impact-resistant flame-retardant rubber conveying belt for an underground mine and a preparation method of the impact-resistant flame-retardant rubber conveying belt, and aims to solve the problems of matrix embrittlement caused by filling of a flame retardant and easiness in delamination under impact. The conveyor belt comprises a covering rubber layer, a gradient buffer layer and a framework core layer from top to bottom. The covering rubber layer adopts an NR / BR / CPE blending matrix, and a superfine flame-retardant system and a liquid nitrile rubber toughening phase are added; the gradient buffer layer contains directionally arranged aramid short fibers to smooth the modulus. The preparation method relates to a multi-stage mixing and controlled cooling vulcanization process. According to the invention, the balance of flame retardance and physical properties is realized, the dynamic impact-resistant life of the belt body is remarkably prolonged by constructing a multi-stage energy dissipation system, the running temperature rise is effectively reduced, delamination is prevented, and the long-term service stability under a high-load working condition is ensured.

The invention relates to the technical field of high-performance polymer materials, in particular to low-dielectric and high-temperature-resistant modified cyanate ester resin and a preparation method thereof. Advantages and characteristics of bisphenol A type cyanate ester monomers and bisphenol M type cyanate ester monomers are combined, and the dielectric property and the thermal stability are remarkably improved. Diallyl bisphenol A is introduced as a network structure modifier, the phenolic hydroxyl group of the diallyl bisphenol A adjusts the curing reaction rate, and the allyl and bisphenol A structures of the diallyl bisphenol A finely regulate and control the rigid-flexible balance of a cross-linked network through chemical copolymerization, so that the curing process is controllable and the final network structure is optimized. Meanwhile, a toughening system is innovatively designed, epoxy-terminated liquid nitrile rubber is adopted for toughening, stable micron-scale rubber particles are formed in a resin matrix in a chemical bonding mode, and the fracture toughness is improved. The modified resin has excellent dielectric properties, high heat resistance and a wide process window, and meets the strict requirements of a new generation of low observability aircrafts on a bearing-stealth integrated composite material matrix.

The invention discloses a high-thermal-conductivity temperature-resistant bonding composite material for COB packaging and a preparation method, and belongs to the technical field of COB packaging materials. The problems of poor heat dissipation and low reliability of a COB product caused by low heat conductivity coefficient, fast bonding strength attenuation at high temperature, high brittleness and easy cracking after curing of an existing bonding material are solved. The composite material is formed by compounding epoxy matrix resin, silane modified boron nitride heat-conducting filler, a carboxyl-terminated nitrile rubber toughening agent and an imidazole curing agent according to a specific mass ratio, multi-element synergistic interaction of all the components is achieved through multiple interaction of covalent bonds, hydrogen bonds, coordinate bonds and the like, and the composite material can be directly adapted to coating and curing processes of an existing COB packaging production line; the adhesive is suitable for bonding and attaching substrates, heat dissipation layers and chip supports in various COB packaging of Mini / Micro LEDs, power semiconductors and the like, and the heat dissipation efficiency and the long-term use reliability of COB products are effectively improved.

This invention discloses a construction method for a thin-layer rubber-reinforced structure for a tunnel invert arch, comprising the following steps: Step 1, spraying concrete onto the initial support of the invert arch and leveling it to form a cement mortar leveling layer; Step 2, laying multiple rings of rubber-reinforced layers sequentially along the tunnel direction from the end onto the cement mortar leveling layer to form a rubber-reinforced layer structure. Each ring of the rubber-reinforced layer includes multiple polyurethane foam boards connected sequentially in the ring direction. A rectangular hole is formed in the center of each polyurethane foam board, and a rubber vibration damping pad is nested within each rectangular hole; Step 3, laying a waterproof sheet on top of the rubber-reinforced layer structure from Step 2; Step 4, pouring invert arch concrete onto the waterproof sheet. This method utilizes a rubber-reinforced layer structure, integrating vibration damping and load-bearing functions, which can absorb a large amount of energy from seismic dynamic loads and reduce the risk of structural resonance.

The present application belongs to the technical field of anticorrosive paint, and particularly relates to an epoxy bacteriostatic anticorrosive paint and a preparation method thereof. The composition comprises the following components: bisphenol A type liquid epoxy resin, epoxy-terminated polysiloxane, core-shell rubber toughening agent, glass flake, surface-modified nano-silicon dioxide, gamma-glycidyl ether oxypropyl trimethoxysilane, reactive silane quaternary ammonium salt, latent imidazole curing agent, dispersant, defoaming agent, leveling agent and organic solvent. The present application forms a functionally graded structure with a surface layer rich in silicon for bacteriostasis and an epoxy anticorrosive bottom through multi-component synergistic design and step-by-step dispersion process; the glass flake and modified nano-silicon dioxide synergistically improve the barrier density, the core-shell rubber toughening agent enhances the film layer crack toughness, the reactive silane quaternary ammonium salt realizes long-term bacteriostasis without damaging the film layer structure, and the latent imidazole curing agent ensures the storage stability of the system.

The invention discloses a high-toughness low-thermal-expansion-coefficient photo-thermal dual-curing epoxy adhesive and a preparation method and application thereof, and belongs to the technical field of photo-thermal dual-curing epoxy adhesives. The photo-thermal dual-curing epoxy adhesive is prepared from the following raw materials in parts by weight: 10 to 18 parts of organic silicon modified epoxy spiro resin, 6 to 10 parts of photo-thermal dual-curing resin, 1 to 5 parts of novolac epoxy resin, 1 to 3 parts of epoxy diluent, 3 to 8 parts of rubber toughened epoxy resin, 0.5 to 1.5 parts of epoxy thermal initiator, 0.3 to 0.8 part of photoinitiator and 0.3 to 0.8 part of silane coupling agent. 70-80 parts of amphiphilic spherical silicon dioxide and 0.3-0.8 part of a stabilizer. The photo-thermal dual-curing epoxy glue has the advantages of low viscosity, high bonding strength, high elongation at break, low thermal expansion coefficient, low elastic modulus, high tensile strength and glass transition temperature, and good construction performance and construction effect when being used for electronic product packaging.

The invention relates to a flow mark resistant polypropylene material and a preparation method thereof, and belongs to the technical field of high polymer materials. According to the invention, ethylene propylene diene monomer with a branched structure is chemically grafted on carbon nanotubes to form an ethylene propylene rubber flexibilizer; the ethylene propylene rubber flexibilizer comprises a carbon nanotube with good heat conduction capability and a branched ethylene propylene diene monomer chain segment; the carbon nanotubes can effectively improve the heat-conducting property of a polypropylene material melt, and in the filling process, when the high-temperature melt is in contact with the surface of a mold, heat can be quickly transferred to the mold, so that the temperature of the mold is increased, and a better product surface can be obtained; the branched ethylene propylene diene monomer chain segment enables molecules to occupy more volume in the space and reduces interaction force and entanglement among the molecules, so that the viscosity of polypropylene melt is reduced, the flowability of the melt is improved, the melt is easy to fill in a mold, and flow marks on the surface of a product can be reduced.

The invention discloses a single-sided adhesive-coated PI film for a heating film and a preparation method thereof.The PI film comprises a release layer, a rubber modified epoxy adhesive layer and a PI film layer which are sequentially arranged in a stacked mode. Ethylene glycol of micromolecular dihydric alcohol is adopted as an initial raw material to prepare polyurethane modified epoxy resin which serves as a main material of the adhesive layer; adding a rubber toughening agent to prepare a heating film; through the toughening effect of the rubber, the flexibility, the bonding strength and the soldering resistance stability of the epoxy resin can be remarkably improved; the rubber has a high wetting and bonding effect on various metal substrates and is relatively good in cohesion, so that the bonding effect of the rubber layer on the metal heating wire and the PI film can be greatly improved, and the protection effect is enhanced; meanwhile, as the selected dihydric alcohol is ethylene glycol, carbamate bonds contained in the prepared polyurethane modified epoxy resin are small in spacing and can be adhered to the surfaces of filler particles at the same time, the compatibility of the filler and the resin is obviously improved, and the aging resistance of the material is greatly improved.

The invention relates to an electrostatic spraying process for a flame-retardant electrical cabinet metal plate, and belongs to the technical field of electrical cabinet surface treatment. The electrical cabinet sheet metal part is sequentially subjected to degreasing, acid pickling, phosphating, water washing and drying treatment; the preparation method comprises the following steps: putting epoxy resin, a modified aliphatic amine curing agent, 4-ferrocenyl butyl methacrylate, 4, 4 '-dimercaptodiphenyl sulfide, benzoyl peroxide, a composite flame retardant, a pigment filler, a carboxyl-terminated nitrile rubber flexibilizer, an acrylate leveling agent, an antioxidant and a diluent into a mixing machine, and mixing to obtain plastic spraying powder; the pretreated sheet metal part is placed in a spraying room, electrostatic spraying, curing forming and aftertreatment are conducted on the surface of the sheet metal part, and the flame-retardant electrical cabinet sheet metal part is obtained; the prepared plastic spraying coating is high in oxygen index, the vertical combustion grade reaches the V-0 grade, the flame retardant effect is excellent, and combustion accidents caused by high temperature and electric sparks of an electrical cabinet can be effectively prevented.

The present invention is directed to an electrically conductive composition comprising: a) a resin component comprising: 1) a first epoxy resin; and, 2) a second epoxy resin and / or a functionalised polybutadiene resin and / or a functionalised butadiene-acrylonitrile copolymer; b) a curative for epoxy resin; c) an electrically conductive filler; d) a one core shell rubber toughener; and, e) a reactive diluent component comprising 1) a monofunctional epoxy diluent and / or 2) a polyfunctional epoxy diluent; wherein said composition further comprises a curing agent if said functionalised polybutadiene resin is present in said resin component.

This invention discloses a resin matrix composition and preparation method for an insulated boom of an aerial work platform. The raw materials of the resin matrix composition, by weight, include the following components in parts by weight: 100 parts epoxy resin matrix, 75-85 parts curing agent, 5-10 parts island-type rubber toughening agent, 1-5 parts surface-modified nano-silica, 0.1-1.0 parts accelerator, and 0.1-0.5 parts defoamer. The island-type rubber toughening agent is a pre-reacted or physically blended epoxy resin containing a rubber phase, which can precipitate spherical rubber particles with a diameter of 0.1-2.0 μm during the curing process, forming a typical island two-phase structure. The surface-modified nano-silica is fumed silica that has been surface-treated with a silane coupling agent. This invention utilizes a combination of island-type rubber toughening agent and nano-silica particles to construct a "soft-hard synergistic" microstructure, which significantly improves the impact toughness and crack resistance of epoxy resin matrix while maintaining high mechanical modulus and enhancing high-voltage electrical insulation performance.

The present invention relates to the technical field of polymer materials, and in particular to a high-elasticity composite polymer material and a preparation process therefor. The present invention solves the problems of poor tensile strength, low impact strength, poor elastic properties, low aging resistance, and poor heat resistance of high-elasticity composite polymer materials. In the present invention, the high-elasticity composite polymer material is prepared from modified polyurethane, a modified rubber, a toughening agent, and modified inorganic particles by means of melt extrusion. In the present invention, the tensile properties of the composite material are improved by controlling the type and dosage of diisocyanate; the elastic properties of the composite material prepared by adjusting the dosages of the modified polyurethane and the modified rubber are improved; the impact strength of the composite material is improved by adjusting the type and dosage of the toughening agent; the aging resistance of the material is improved by introducing an ultraviolet absorber as an end-capping agent into the main body of the composite material; and the heat resistance of the composite material is improved by using nanoparticles modified with KH-792.

The invention provides an impact-resistant PBT (polybutylene terephthalate) material and a preparation method thereof. The preparation method comprises the following steps: step 1, adding dried PBT resin, surface-modified glass beads, a core-shell toughening agent, an antioxidant and a lubricant into a high-speed mixer for mixing; 2, extruding and granulating by using a double-screw extruder; step 3, cooling the extruded strip material in a room-temperature water tank, and then blow-drying and pelletizing; and 4, injection molding: drying and injection molding. The PBT material with high impact toughness and high rigidity is successfully prepared through a multi-phase structure design of a rigid particle dispersion phase, a reactive core-shell elastomer and a PBT matrix in combination with a unique interface modification technology, and by utilizing the synergistic effect of the surface-modified rigid particles and the core-shell toughening agent, the impact toughness and rigidity of the PBT material are greatly improved. The industrial problem that in a traditional rubber toughening technology, toughening must damage steel is solved, balance of three key performance indexes including rigidity, toughness and strength is achieved, and the comprehensive performance is far better than that of a commercial MBS toughening system.

The application provides a kind of polybutyl acrylate and preparation method and ASA resin.The preparation method of polybutyl acrylate includes the following steps: S1: butyl acrylate, RAFT reagent, emulsifier, optional electrolyte and water are mixed, then initiator, reducing agent is added to react, PBA seed emulsion is obtained;S2: butyl acrylate, RAFT reagent, emulsifier, initiator and water are mixed into pre-emulsion;S3: reducing agent, pre-emulsion is added to PBA seed emulsion to react, polybutyl acrylate is prepared.The polybutyl acrylate prepared by the application has high molecular weight, narrow molecular weight distribution, high branching degree, good rubber toughening effect, and can prepare super high impact ASA resin with less amount of glue powder, impact strength greater than 400J / m, and excellent weather resistance, dE less than 15 after 500h of ultraviolet aging test.

This invention relates to cyanoacrylate-containing compositions that include (a) a beta-alkoxy cyanoacrylate component, (b) a cyanoacrylate component selected from the group consisting of 2-methylbutyl cyanoacrylate, isoamyl cyanoacrylate, 2-ethylhexyl cyanoacrylate, 2-pentyl cyanoacrylate, 3-methylpentyl cyanoacrylate, 2-ethylbutyl cyanoacrylate, 3, 7-dimethyloctyl cyanoacrylate, and combinations thereof; and (c) a rubber toughening component. Cured products of the inventive cyanoacrylate compositions demonstrate improved toughness without an odor typically found with cyanoacrylate-containing compositions.

This invention belongs to the field of epoxy resin technology, specifically relating to a low-viscosity, high-heat-resistant, toughened epoxy resin composition and its preparation method. The composition comprises, by weight, 100 parts of phenolic resin A, 5-15 parts of core-shell rubber toughening agent B, 35-43 parts of aromatic diamine curing agent C, 1-5 parts of bifunctional epoxy reactive diluent D, 0.5-2 parts of silane coupling agent E, and 0.1-1 parts of basic imidazole curing accelerator F. The preparation method includes: preheating resin A and then dispersing it with core-shell rubber toughening agent B under high-speed shear; after cooling, adding curing agent C, diluent D, silane coupling agent E, and accelerator F sequentially and stirring until homogeneous; after vacuum degassing, pouring the mixture into a mold; and obtaining the cured product through a segmented curing process of initial curing at 125-160℃ and subsequent curing at 180-190℃. This achieves an excellent combination of low viscosity processability and high heat resistance, making it suitable for the preparation of high-performance composite materials.

The invention provides a high-toughness temperature-resistant TPEE barrier film and a composite waterproof joint strip, and belongs to the technical field of clothing materials. The barrier film provided by the invention comprises the following components in parts by weight: 70-90 parts of TPEE colloidal particles; 2 to 10 parts of SEBS rubber; and 2-5 parts of a toughening agent. The composite waterproof joint strip comprises the high-toughness temperature-resistant TPEE barrier film and a hot melt adhesive compounded on the single surface of the high-toughness temperature-resistant TPEE barrier film. The SEBS rubber, the flexibilizer, the chain extender and other components are introduced into the TPEE barrier film formula for modification, and the modified TPEE barrier film is compounded with the hot melt adhesive to prepare the high-toughness temperature-resistant composite waterproof joint strip. The temperature-resistant and water-resistant adhesive has excellent temperature resistance, high toughness, good water washing resistance and strong bonding strength to a windproof and waterproof clothing coating, and has a good application prospect.