13results about How to "Small compression set" patented technology

The invention discloses low-temperature-resistant perfluoroether rubber and a preparation method thereof, and the low-temperature-resistant perfluoroether rubber comprises the following raw material components in parts by weight: 80-120 parts of a perfluoroether rubber polymer, 1-5 parts of an additive, 10-30 parts of a filler, 1-3 parts of a cross-linking agent, 1-4 parts of an accelerant, 1-3 parts of a processing aid and 1-3 parts of an acid acceptor. The perfluoroether rubber polymer is prepared through a two-step polymerization method, and then the perfluoroether rubber polymer and all the mixed auxiliary materials are mixed and mixed to prepare the low-temperature-resistant perfluoroether rubber. The perfluoroether rubber provided by the invention not only has relatively high hardness, tensile strength, extrusion deformation resistance, shearing resistance and low temperature resistance, can meet the use requirement of the perfluoroether rubber at-40 DEG C, but also has excellent plasma etching resistance, and can be applied to the semiconductor industry.

The invention discloses extrusion-head in-situ rapid high-crosslinking low-compression permanent deformation conductive silicone rubber and a preparation method thereof. The conductive silicone rubber is prepared from the following raw materials in parts by mass: 100 parts of high vinyl silicone rubber, 2-10 parts of high vinyl silicone oil, 10-30 parts of white carbon black, 150-250 parts of coupling agent modified conductive powder, 2-5 parts of a vulcanizing agent and 1-3 parts of an assistant vulcanizing agent. The plunger type extruder is adopted, the raw materials are extruded and then subjected to in-situ rapid vulcanization forming, the formed conductive silicone rubber is high in crosslinking density and low in compression set, the problem that rubber strips of special-shaped complex structures are prone to collapse and deformation is solved, and the extruded conductive rubber strips do not need to be fed into a vulcanization channel for secondary vulcanization. The conductive rubber strip prepared by the invention has excellent electrical property and electromagnetic shielding effectiveness, and is high in mechanical property, good in rebound resilience and good in processability.

The invention discloses a sandal insole, a preparation method thereof and a sandal, and relates to the field of shoe materials. The sandal insole comprises a PU insole base material, and the PU insole base material is formed by reacting a material A and a material B; the material A comprises bifunctional polytetrahydrofuran ether, micromolecular straight-chain diol, branched-chain diol, a chemical foaming agent, a catalyst and polyether silicone oil; the branched chain diol is selected from at least one of 2-butyl-2-ethyl-1, 3-propylene glycol and 2, 2, 4-trimethyl-1, 3-pentanediol, and the branched chain diol is selected from at least one of 2-butyl-2-ethyl-1, 3-propylene glycol and 2, 2, 4-trimethyl-1, 3-pentanediol; the material B comprises an isocyanate component A and an isocyanate component B, the isocyanate component A is obtained by reaction of diphenylmethane diisocyanate, polypropylene oxide glycol, polypropylene oxide triol and carbodiimide modified diphenylmethane diisocyanate according to a specific ratio, and the isocyanate component B is isophorone diisocyanate. The sandal insole has the advantages of excellent seawater resistance, low compression set rate, good mechanical properties and long service life.

The invention discloses an antioxidant MB-S and a preparation method and application thereof, belonging to the technical field of rubber antioxidants. The technical scheme is: the following structural formula is obtained by synthesizing antioxidant MB, aldehyde compounds and hydroxylamine or its inorganic salt as raw materials in an alcohol solvent under the catalytic action of a catalyst, specifically comprising the following steps: 1) placing antioxidant MB and aldehyde compounds in an alcohol solvent, adding a catalyst, reacting under reflux for 2-6 hours, and generating an intermediate dihydroxymethylated MB; 2) adding hydroxylamine or its inorganic salt, continuing the reflux reaction for 2-6 hours, adding an alkaline solution to neutralize the pH to 6-7, cooling and crystallizing, centrifuging, and drying to obtain antioxidant MB-S. The antioxidant MB-S of the present invention has a low transition state energy with alkane peroxyl radical reaction and has a strong antioxidant ability, which helps to improve the life and performance stability of rubber products and reduce maintenance costs.

The present application relates to the field of elastic material, and relates to a composition for preparing vulcanized rubber, and vulcanized rubber and its preparation method and application.The composition comprises: (a) styrene butadiene rubber with a Mooney viscosity of 48-66, 10-100 parts by weight; (b) polypropylene, 40-200 parts by weight; (c) organic peroxide, 1.0-10 parts by weight; (d) antioxidant, 0.1-5 parts by weight; and 100 parts by weight of ethylene propylene diene rubber.The vulcanized rubber prepared from the composition of the present application can obtain excellent mechanical properties.

The application belongs to the technical field of copolymer elastomers, and particularly relates to a polyamide-polyether block copolymer elastomer material with a branched structure and a preparation method and application thereof; polyamide monomers, polyether monomers, at least three carboxyl functional branched monomers, linear dibasic acid, a catalyst and water are added into a reaction kettle, and then mixed to perform a melt polycondensation reaction; the melt polycondensation reaction process comprises the following steps: (1) a monomer ring-opening stage: the reaction temperature is 130-190 DEG C, the reaction time is 1-5 h, and the pressure is less than 0.5 MPa; (2) a pre-polycondensation stage: the reaction temperature is 190-240 DEG C, the reaction time is 1-5 h, and the pressure is less than 0.5 MPa; (3) a final polycondensation stage: the reaction temperature is 240-280 DEG C, the reaction time is 1-5 h, and the pressure is less than 200 Pa. The functional branched monomers are introduced to construct low-density chemical branched points, so that the material can significantly improve the mechanical properties and thermal stability while maintaining the thermoplastic processing performance.

The invention discloses a self-adhesive cling film and a preparation method thereof, and belongs to the technical field of cling film. The preparation method of the self-adhesive cling film comprises the following steps: Step 1: putting linear low-density polyethylene, ultra-low-density polyethylene, modified POE elastomer, modified silica, glycerol, sorbitol and trimethylolpropane into a hot mixer in an extruder, heating to 90°C, stirring for 30 minutes, putting into a low-speed cold mixer, stirring, cooling and discharging; Step 2: adding the mixture into a screw extruder, the mixture is heated, sheared, conveyed and plasticized, and finally enters a die head mold, blown into a film, and a PE cling film is obtained. The self-adhesive cling film provided by the invention not only has high air permeability, effectively improves the preservation time and preservation effect of food, but also has strong antioxidant capacity and antibacterial properties.

The invention belongs to the field of rubber materials, and provides a rubber composition for a tire steel wire belt layer and a preparation method thereof, and the rubber composition comprises 70-90 parts of natural rubber, 20-40 parts of epoxidized natural rubber, 5-7 parts of a tackifying system, 50-65 parts of carbon black, 2-5 parts of an anti-aging agent, and 4-6 parts of a sulfur system. The tackifying system is prepared through a reaction of benzimidazole, a thiuram compound and omega-brominated fatty acid benzyl ester, and the omega-brominated fatty acid benzyl ester is prepared through a nucleophilic substitution reaction of omega-brominated fatty acid and benzyl bromide. Benzimidazole and a thiuram compound are bridged through a flexible aliphatic chain to form a tackifying system molecule, and the molecule can be chelated with copper / zinc / iron and other metal ions on the surface of a steel wire through a benzimidazole part, so that the initial bonding strength between rubber and the steel wire is improved; the thiuram part improves the interface stress distribution of the steel wire belt layer rubber and the steel wire, and the bonding performance of the steel wire cord fabric layer is improved.

The present disclosure discloses a low-odor high-resilience polyurethane foam and a preparation method thereof, and relates to the field of foam preparation. The low-odor high-resilience polyurethane foam comprises a polyol side composition and an isocyanate component. The polyol side composition comprises, based on 100 parts by mass of the polyether polyol in the polyol side composition: 2-5 parts by mass of open-cell polyether, 1-2 parts by mass of diethanolamine, 0.2-0.5 parts by mass of low-odor low-cyclic polyether modified silicone oil, 0.3-0.5 parts by mass of a reactive composite catalyst, 0.3-0.7 parts by mass of a low-odor gel catalyst, and 2.5-3.8 parts by mass of water. The isocyanate component is diphenylmethane diisocyanate. The ratio of the isocyanate component to the polyol side composition is 100-120 in terms of the isocyanate index. The present disclosure improves the problems of foam odor, high volatile organic compound emission, insufficient long-term odor retention, difficulty in balancing high resilience and low compression permanent set, and limited foam structure regulation means.

The invention discloses a pure-carbon-dioxide-resistant anti-explosion ternary fluororubber material and a preparation method of the pure-carbon-dioxide-resistant anti-explosion ternary fluororubber material. The material is prepared by taking ternary fluororubber raw rubber as a matrix, matching magnesium oxide, calcium hydroxide, light carbon black, thermal cracking carbon black, flaky calcium carbonate, a flaky air blocking agent, a WS280 processing aid, palm wax and a fluorine-linked 5 # vulcanizing agent, and carrying out plastifying and mixing, first-stage mold pressing vulcanization and second-stage drying oven vulcanization on the matrix and magnesium oxide, calcium hydroxide, light carbon black, thermal cracking carbon black, flaky calcium carbonate, flaky air blocking agent, WS280 processing aid, palm wax and fluorine-linked 5 # vulcanizing agent. Through the physical barrier effect of the flaky filler and the collaborative design of a specific vulcanization system, the anti-permeation and anti-bubbling performance of the material in a high-temperature and high-pressure pure COenvironment is remarkably improved, and meanwhile, good mechanical strength, suitable hardness and low-compression permanent deformation are kept. The preparation process of the material is compatible with traditional rubber processing, the process is stable and controllable, and the material is suitable for sealing parts under harsh working conditions such as carbon dioxide capture, utilization and storage and has a good industrial application prospect.

The application discloses an oil-resistant submarine valve rubber and a preparation method thereof, and belongs to the technical field of rubber sealing materials. The rubber is prepared from the following raw materials: base rubber, molybdenum disulfide nanoflower, vulcanizing agent and additive. The molybdenum disulfide nanoflower is a flower-like aggregate formed by self-assembly of molybdenum disulfide nanosheets, and has interlayer mesopores. The preparation method comprises the following steps: dissolving the molybdenum disulfide nanoflower and the base rubber in organic solvents respectively, mixing the two, co-precipitating with water to obtain rubber masterbatch, and then mixing and vulcanizing the rubber masterbatch, the vulcanizing agent and the additive to form the rubber. The molybdenum disulfide nanoflower single filler can simultaneously realize the triple functions of labyrinth barrier, interlayer mesopore oil storage and solid lubrication, can effectively inhibit the swelling of the rubber in oil-based mud, and can maintain the size stability of the conical surface seal.

The invention describes a polyisocyanurate plastic containing, with respect to the total plastic, a) a cured polymer comprising, with respect to the total polymer,-at least 75% by weight of polyether chains,-1 to 5.2% by weight of urethane groups, and-0.7 to 7% by weight of isocyanurate groups, b) at least 20% by weight of at least one filler. The polyisocyanurate plastics exhibit significant rubber-like properties, with low elastic modulus, low glass transition temperature and surprisingly high dimensional stability as well as high elastic recovery after compression, without the tendency of becoming brittle over time. The invention relates to a thermally conductive polymer, which is readily available and is particularly suitable for applications such as shock absorbers, sealants, adhesives or interstitials, in particular interstitials with high thermal conductivity, suitable for contact with electronic components or devices, in particular batteries of electric vehicles.

The application discloses an inlaid biodegradable polyurethane / lignin composite material and a preparation method and application thereof. The preparation method of the inlaid biodegradable polyurethane / lignin composite material comprises the following steps: (1) obtaining NCO-terminated polyurethane prepolymer by taking polycaprolactone, polycarbonate diol and polyisocyanate as raw materials; (2) mixing and stirring lignin with the NCO-terminated polyurethane prepolymer under a solvent-free condition; (3) adding glycerol or 1,4-butanediol into the system to perform a chain extension reaction, so as to obtain a chain-extended product; and (4) vulcanizing the chain-extended product to obtain the inlaid biodegradable polyurethane / lignin composite material. The application provides application of the composite material in preparation of an armored track shock-absorbing block. The polyurethane / lignin composite material prepared by the application has high strength, low compression permanent deformation and biodegradability and the like, and can improve the bearing capacity and durability of the armored track as a whole.