9results about How to "Wide damping temperature range" patented technology

The invention relates to an epoxy-terminated polyurethane flexibilizer for bridge and tunnel pavement, and a preparation method and a use method thereof, and the flexibilizer is prepared by terminating a polyurethane prepolymer through an epoxy group of an epoxy compound under the catalytic action of nano-modified imidazole; wherein an epoxy group reacts with an NCO group at the end part of a polyurethane prepolymer, and a five-membered ring structure with high cohesive energy is introduced into a polyurethane molecular chain. A main chain of the epoxy-terminated toughening agent contains a five-membered ring structure, and the epoxy-terminated toughening agent is prepared from an epoxy group and an isocyanate group through catalysis of nano-modified imidazole at a relatively low temperature. Due to the fact that the cohesive energy of the five-membered ring is high, the steric hindrance effect is large, good high and low temperature stability is achieved, and the damping temperature range is wide. And after being cured, the curing agent has the properties of high-temperature rutting resistance, medium-temperature fatigue resistance, low-temperature crack resistance and the like, and the problem of insufficient toughness of an epoxy mixture in conventional pavement is solved.

The utility model discloses a diaphragm for sounding device, sounding device and electronic equipment. The diaphragm includes at least one thermoplastic polyurethane elastomer alloy layer, and the thermoplastic polyurethane elastomer alloy layer includes first thermoplastic polyurethane elastomer and second thermoplastic polyurethane elastomer. The glass transition temperature of the first thermoplastic polyurethane elastomer is -60 to -30 DEG C, and the glass transition temperature of the second thermoplastic polyurethane elastomer is -25 to 10 DEG C. The thermoplastic polyurethane elastomer alloy layer of the utility model includes thermoplastic polyurethane elastomer of different glass transition temperatures, can effectively expand the damping temperature zone of diaphragm, and diaphragm can keep good damping under the condition of wider frequency interval in the wider use temperature range.

The invention discloses an ultra-tough wide temperature range damping elastomer composite material and a preparation method thereof, and relates to the technical field of multifunctional composite materials; the preparation method comprises the following steps: (1) dissolving tannic acid in deionized water, then adding calcium chloride to dissolve, freezing treatment, and obtaining solution ice cubes; (2) dissolving disodium hydrogen phosphate dodecahydrate and sodium dihydrogen phosphate with deionized water to obtain a mixed solution; (3) adding the solution ice cubes obtained in step (1) and the mixed solution obtained in step (2) to an aqueous polyurethane solution, stirring until the solution ice cubes are completely melted, vacuum filtering and drying, and obtaining an ultra-tough wide temperature range damping elastomer composite material. The invention prepares a polyurethane composite material by a method of in-situ crystallization enhancement and toughening at a phase interface, which effectively solves the problems of poor mechanical properties, low glass transition temperature and lack of functionality of existing polyurethane composite materials.

The invention belongs to the field of polymer-based damping materials, and discloses a dibenzylideneacetone modified hydrophobic butyl rubber damping composite material and a preparation method thereof. Butyl rubber, sodium hydride, and dibenzylideneacetone are reacted in torque rheology for a period of time, and then the rubber is mixed on a double-roll mixer, and stearic acid, zinc oxide, tetramethylthiuram disulfide, dibenzothiazole disulfide, sulfur powder, lignin-modified phenolic resin, and filler montmorillonite are added in order until the roll is wrapped and mixed evenly, and the raw rubber is removed and placed for 24-36h to remove bubbles to obtain raw rubber; The raw rubber is vulcanized on a flat vulcanizer to obtain a hydrophobic butyl rubber damping composite material. The present invention adds lignin-modified phenolic resin and solvent-free modified butyl rubber, which is green and environmentally friendly, simple to operate, introduces a benzene ring rigid group, broadens the butyl rubber damping temperature range, improves the damping factor, and makes the damping material have hydrophobic properties, broadens the application field of butyl rubber damping materials.

The invention discloses a modified brominated butyl rubber composite damping material and a preparation method thereof, and relates to the field of rubber materials.The preparation method comprises the steps that a brominated butyl rubber composition and an aging agent are subjected to primary banburying, and cerium dioxide / brominated butyl rubber is obtained; heating and uniformly mixing the internally mixed cerium dioxide / brominated butyl rubber and epoxy resin composition at a constant temperature, and then carrying out secondary internal mixing to obtain a cerium dioxide / brominated butyl rubber / epoxy resin intermediate composite material; and carrying out open milling on the intermediate composite material, and then carrying out vulcanization molding to obtain the modified brominated butyl rubber composite damping material. The problems that the temperature range is narrow, the damping performance at the low temperature is poor, the aging phenomenon is prone to occurring in the using process, and the service life is affected are solved, the prepared composite material has the advantages of being stable at the high temperature, good in damping performance, good in ultraviolet stability and the like, and the provided preparation method is simple in process.

The invention relates to a polyacrylate coating, a preparation method thereof, a battery and an electric device. The polyacrylate coating is prepared from the following raw material components in parts by weight: 40 to 70 parts of acrylate copolymer emulsion, 10 to 25 parts of flame-retardant filler, 0.5 to 5 parts of adhesion promoter and 10 to 45 parts of water, the acrylate copolymer emulsion is prepared by emulsion copolymerization of an acrylate monomer, an alkyl ester monomer, a nitrogen-containing monomer and a phosphorus-containing monomer in the presence of an initiator, and an emulsifier adopted in emulsion copolymerization comprises a phosphorus-containing anionic emulsifier and a nitrogen-containing nonionic emulsifier; the chain length of alkyl in the alkyl ester monomer is C10-C18. The polyacrylate coating has good damping and flame retardant properties.

This invention relates to the field of silicone rubber materials technology, specifically to a wide-temperature-range pressure-heated silicone rubber material for automobiles and its preparation method. The automotive wide-temperature-range pressure-heated silicone rubber material comprises the following raw materials: by weight, 40-60 parts liquid silicone rubber, 30-50 parts phase change energy storage system, 3-8 parts damping reinforcing filler, 2-5 parts antifreeze modifier, 1-3 parts silane coupling agent, 1-3 parts flame retardant synergist, and 0.5-1.5 parts platinum catalyst. The automotive wide-temperature-range pressure-heated silicone rubber material prepared by this invention possesses pressure-triggered self-heating characteristics, along with wide-temperature-range stability, excellent damping and vibration reduction performance, and compliance with safety standards.

The invention provides high-damping wide-temperature-range rubber and a preparation method thereof, and relates to the technical field of functional polymer materials. The high-damping wide-temperature-range rubber comprises the following components in parts by mass: 50-70 parts of natural rubber; 30-50 parts of butyl rubber; 0.5 to 1.0 part of corrugated mica; 1.5 to 2.5 parts of an anti-aging agent; 30-40 parts of carbon black; 45-70 parts of an inorganic filler; 3-5 parts of a plasticizer; 0.8 to 1.2 parts of sulfur; and 0.5 to 1.5 parts of accelerant. The rubber material has excellent damping performance.

The invention discloses hindered phenol graft modified expandable graphite as well as a preparation method and application thereof. According to the invention, the hindered phenol grafted and modified expandable graphite is introduced into a butyl rubber system as a modified filler, on one hand, additional addition of an antioxidant is avoided, and at the same time, a reversible hydrogen-bond interaction is formed between hindered phenol and a polar side group in a rubber matrix, so that the damping effect of rubber can be improved, and a wider damping temperature range can be obtained; on the other hand, hindered phenol is introduced to the expansible graphite, so that the compatibility of the expansible graphite and the butyl rubber is improved, agglomeration of the expansible graphite in the butyl rubber is avoided, the bonding strength between interfaces of the expansible graphite and the butyl rubber is also improved, and the mechanical property and the flame retardant property of the composite material are improved; # imgabs0 #