146results about How to "Extended scorch time" patented technology

Provided is a tire rubber composition blended with an antioxidant that is derived from a raw material other than petroleum resources, the tire rubber composition being capable of achieving an oxidation resistance equal to or higher than a conventional level and of improving forming processability and a low hysteresis loss property. The tire rubber composition includes a blend of: 100 parts by weight of a diene rubber; 5 to 130 parts by weight of an inorganic filler; and 0.01 to 10 parts by weight of a tea extract containing a catechin.

The invention provides a fluororubber rubber compound and a preparation method thereof. The fluororubber rubber compound is prepared by mixing binary intermediate-low monney sectional fluororubber rubber, reinforcing system (MT N990 carbon black and inorganic filler), acid absorbing system (active magnesium oxide and superfine calcium hydroxide), vulcanizing system (benzyl triphenyl phosphorus chloride and bisphenol AF), releasing agent (alfux and/or carnauba wax), and multifunctional bisphenol vulcanizing composite assistant vulcanizing agent L; the obtained fluororubber rubber compound has high stretching strength, and high extending rate, increases the scorching time by improving the liquidity of the rubber, therefore, high adaptability of the rubber to different manufacture technical environments and the vulcanizing environments can be ensured, the safety in vulcanizing can be improved, and as a result, the rejection rate of the products can be reduced. The fluororubber rubber compound provided by the invention is applicable to industries such as aerospace, aviation, car, metallurgy, petrochemical industry and electron and the like.

PCT No. PCT/JP97/03212 Sec. 371 Date May 8, 1998 Sec. 102(e) Date May 8, 1998 PCT Filed Sep. 11, 1997 PCT Pub. No. WO98/11161 PCT Pub. Date Mar. 19, 1998A rubber composition for a tire comprising: 100 parts by weight of a starting rubber; 10 to 150 parts by weight of a carbon black; 0.1 to 20 parts by weight of a sulfur; and 40 parts by weight or less of a polysiloxane having the following alkoxysilyl group (I) or acyloxysilyl group (II) and having an average degree of polymerization of 3 to 10,000: 3BOND Si-OR1(I) 3BOND Si-OCOR2(II) wherein R1 is a substituted or unsubstituted monovalent hydrocarbon group or an organic group containing an ether bond and having 1 to 18 carbon atoms and R2 is hydrogen or a hydrocarbon group having 1 to 21 carbon atoms.

The invention discloses a low-volatility benzothiazolyl mercaptosilane and a preparation method thereof. A molecular structural formula of the low-volatility benzothiazolyl mercaptosilane is shown in the patent specification. The preparation method of the low-volatility benzothiazolyl mercaptosilane comprises the following steps that 1, a polyether and a chloroalkyl silane undergo a reaction at a temperature of 30 to 180 DEG C in the presence of one or more catalysts; and R3-H is separated from the reaction products so that a silane semi-finished product is obtained; and 2, 2-mercaptobenzothiazole is added into an organic solvent; and one or more alkalis and semi-finished silane are added into the 2-mercaptobenzothiazole solution to undergo a reaction with stirring at a temperature of 20 to 120 DEG C in a nitrogen atmosphere for 0.5 to 24 hours; the reaction products are subjected to filtration, washing and reduced pressure distillation to produce a brown-red liquid desired product. The low-volatility benzothiazolyl mercaptosilane can release a small quantity of alcohols, can improve reinforcing effects, mechanical properties and dynamic mechanical properties of vulcanized rubbers, and rolling resistance and wet skid resistance of tread rubber, has long scorch time and fast sulfuration speed, and can improve greatly sulfuration performances of rubber materials.

The invention relates to a packaging adhesive film for a solar cell, which can effectively prolong scorch time T2 and improve the processing and packaging properties of an EVA adhesive film on the basis of small change on total cross-linking time TC. The packaging adhesive film for the solar cell contains a copolymer of ethylene-vinyl acetate (EVA), a cross-linking agent, a cross-linking inhibitor and a radical trap, wherein, the masses of the cross-linking inhibitor and the radical trap are respectively 0.1-1.0% and 0-0.3% of the mass of the ethylene-vinyl acetate copolymer, and the cross-linking time of the packaging adhesive film for the solar cell is 10-30min. In the invention, the cross-linking inhibitor and the radical trap are added based on the formula of the existing packaging adhesive film for the solar cell to form a stable molecular structure with active radicals generated in the peroxide cross-linking agent, thus effectively preventing early-stage cross-linking and over cross-linking, and effectively prolonging the scorch time T2 on the basis of guaranteeing the total cross-linking time TC to meet the requirements.

The invention provides a rubber material for buffer composite with metal and rubber, comprising rubber, vulcanizing agent, accelerating agent, anti-aging agent, strengthening agent, active agent, elasticizer, filler and anticoking additive. The rubber material is characterized by good mechanical property, distinctive anti-aging property, strong adhesive strength between rubber and metal, permitted rubber creep range during usage, long coke burning time, and fast vulcanizing speed.

The invention relates to a high-strength synchronous belt. The synchronous belt comprises a synchronous belt framework and an adhesive piece attached to the outer side of the synchronous belt frame. The adhesive piece comprises the following components in parts by weight: 70-90 parts of hydrogenated butadiene-acrylonitrile rubber, 10-30 parts of chloroprene rubber, 14-25 parts of trans 1, 4-polyisoprene, 4-8 parts of methylacryloyl silane, 5-15 parts of aramid pulp, 10-20 parts of reinforced fiber SP-6701, 20-40 parts of carbon black, 4-7 parts of peroxide crosslinking agent, 1-4 parts of assistant crosslinking agent, 0.5-1.5 parts of hexamine, 2-5 parts of plasticizer and 1-3 parts of antiaging agent. The invention also relates to a manufacturing method of the synchronous belt. According to the high-strength synchronous belt and the manufacturing method thereof, the hydrogenated butadiene-acrylonitrile rubber and the chloroprene rubber are used together, so that the performances of the hydrogenated butadiene-acrylonitrile rubber and the chloroprene rubber are complementary, and thus the wear resistance and the heat resistance of the adhesive piece of the synchronous belt can be effectively improved; the shear strength and the quality stability of the synchronous belt are improved by use of the trans 1, 4-polyisoprene, the methylacryloyl silane and the aramid pulp.

A vulcanizable rubber composition is provided that comprises an elastomer, a reinforcing filler comprising silica or a mixture thereof with carbon black, a silica dispersing aid comprising about 0.1 to about 15 phr poly(vinyl acetate) (PVA), and a cure agent. The addition of PVA to the composition improves the processability of the compound, improves the tear strength and modulus of the rubber and can reduce the number of mixing stages during compounding, resulting in lowering of the cost of operation and increasing plant productivity without compromising the processability or other physical properties of the stocks. Also provided are a vulcanizate formed from vulcanizing the rubber composition, a tire component formed from the vulcanized rubber and a process for forming the tire component.

The invention relates to a preparation method of N,N'-m-phenylenebismaleimide (HA-8). The preparation method is mainly technically characterized by firstly adding m-phenylenediamine in a reaction kettle equipped with a stirrer and a thermometer, then adding a solvent, stirring for fully dissolving the m-phenylenediamine, further adding maleic anhydride, keeping the temperature for 2 hours after completion, then adding acetic anhydride, completing the reaction, further evaporating, recovering the solvent of acetone, finally carrying out centrifugal washing for obtaining a crude product, drying, smashing and obtaining a finished product. The yield is calculated to be 91.5% by taking the m-phenylenediamine as a standard substance. The product is mainly used in natural rubber and various types of synthetic rubber, and can prevent reversion by being matched with sulfur, improve the heat resistance and the anti-aging property, reduce the heat production of the rubber and improve the bonding property between the rubber and metal fabric.

The invention provides a method for preparing zinc dibenzyl dithiocarbamate (ZBDC) thiofide, which comprises that: the raw materials used are dibenzylamine, carbon disulfide, sodium hydroxide and anionic surfactant, wherein the stoichiometric molar ratio of dibenzylamine to carbon disulfide to sodium hydroxide and anionic surfactant to zinc chloride to sulfuric acid is 1:1.05-1.2:1.05-1.2:0.020-0.025:0.53-0.58:0.005-0.015; and the process comprises: adding dibenzylamine, carbon disulfide, sodium hydroxide and anionic surfactant in a given amount into a reaction kettle holding purified water with stirring in turn, lower the temperature by 10 to 20 DEG C totally, dripping carbon disulfide liquid in a given amount within 6 to 7 hours, stirring for 0.5 to 1 hours after the dripping is finished, keeping the temperature at 30 to 38 DEG C constantly, dripping solution of zinc chloride, performing replacement reaction, regulating the pH value of the reaction liquid to 7 to 9 with sulfuric acid after the replacement reaction is finished, finishing the reaction, stirring for 1 to 2 hours, performing solid-liquid separation, discarding liquid and drying, crushing, sieving and packaging the solid. The anionic surfactant is sodium dodecyl sulfate.

A vibration damping rubber composition having an excellent vibration damping performance includes the following (A) to (C) as essential components: (A) a diene-based rubber;

(B) a vulcanizing agent of a bismaleimide compound represented by the following formula (1):

[wherein X denotes a substituted or unsubstituted aliphatic saturated hydrocarbon group; and R¹ to R⁴ may be the same or different and each denote a hydrogen atom, an alkyl group, —NH₂, or —NO₂, provided that the bismaleimide compound represented by formula (1) excludes a compound in which X is —(CH₂)n- (n is an integer of 4 to 12) and all R¹ to R⁴ are hydrogen atoms], wherein the vulcanizing agent is sulfur-free; and

(C) a vulcanization accelerator.

Disclosed are tread rubber materials for making meridian aircraft tire belt layer cord threads with aramid fiber threads. The rubber materials are prepared according to a certain ratio with 1# smoke sheet rubber as main rubber materials and butadiene styrene rubber, resorcinol bonding resin, formaldehyde bonding resin, a bonding promoter AIR-201 special for the aramid fiber threads, a bonding promoter AIR-1, highly-abrasion-resistant carbon black, precipitated silica, a novel silane coupling agent, insoluble sulfur and a sulfenamide accelerator as main auxiliary materials. The rubber materials have the performance advantages that the bonding strength of the rubber materials and the aramid fiber threads is high, and the bonding retention rate after thermal ageing is high and have the performance characteristics of being high in tensile strength and tearing strength, low in compression fatigue heat generation and high in definite elongation stress. The rubber materials are used as aircraft meridian tire belt layer tread rubber, thus under the high-load and high-speed severe usage conditions, the quality problems of rubber thread loosening or delaminating of layers do not occur to the belt layer position of the aircraft tire, the rubber threads are bonded firmly, and the tire is safe to use.

The invention discloses a novel medical powder injection rubber plug and a manufacturing method thereof, which belong to the technical field of medical packaging materials. The invention is characterized in that the rubber plug is manufactured by using the following raw materials in part by weight: halogenated butyl rubber 50-60, argil 30-40, carbon black 0.5-1.0, magnesium oxide 2.0-3.0, vulcanizing agent 0.1-0.3, titanium white 0.5-2.5, and carbon black master batch 0.2-1.0. The halogenated butyl rubber may be chlorinated butyl rubber or brominated butyl rubber. The rubber plug of the invention has high chemical resistance, high chemical compatibility, high biological safety and good chemical properties.

The invention discloses a flame-retardant sealing ring for motors of range hoods. The flame-retardant sealing ring is made from raw materials including nitrile rubber, zinc oxide, stearic acid, carbon black, white carbon black, sulphur powder, an accelerant CZ, an accelerant M, an accelerant TMTD, ETU-80, light magnesium oxide, pottery clay, chloroprene rubber adhesive, aluminum hydroxide, a silane coupling agent, zinc borate, antimonous oxide, modified flame retardant, dioctyl phthalate, carnauba wax, antiager 2246, antiager BZ and a processing agent WB-16. The flame-retardant sealing ring is good in high-temperature resistance and flame retardant performance, and meanwhile has the advantages of oil resistance, no halogen, low toxicity and environment friendliness.

The invention discloses tall oil modified phenolic resin including the following components by weight: 50-100 parts of phenol, 1-50 parts of alkylphenol, 50-100 parts of a 37% formaldehyde aqueous solution, 0.1-5 parts of a catalyst, 1-100 parts of tall oil and 0.1-5 parts of a terminating agent. The invention also discloses a two-step preparation method of the tall oil modified phenolic resin. The tall oil modified phenolic resin is suitable for rubber reinforcement, and is particularly suitable for the production of tires.

The invention relates to a generator damping pad for electric power. The damping pad is prepared from, by weight, 40-60 parts of butadiene styrene rubber, 20-40 parts of chloroprene rubber, 23-26 parts of fluoroether rubber, 0.1-15 parts of graphene, 13-15 parts of phenolic resin, 1-10 parts of a silane coupling agent, 12-15 parts of semi-reinforcing furnace black, 10-12 parts of roasted pottery clay, 6-12 parts of Kevlar chopped fibers subjected to surface treatment, 1-10 parts of carbon black, 5-7 parts of nanometer molybdenum disulfide (MoS2), 1-10 parts of an anti-aging agent, 4-8 parts of zinc oxide and 1-5 parts of an accelerator. Butadiene styrene rubber, chloroprene rubber and fluoroether rubber serve as the main materials of the generator damping pad, and thus the prepared generator damping pad is resistant to abrasion and high temperatures and low in noise and has excellent impact resistance and abrasion resistance.

The invention discloses a rare-earth complex rubber anti-aging agent, and a preparation method and application thereof. The preparation method of the rare-earth complex comprises the following steps: dissolving sodium sulfanilate in water to prepare a solution having a concentration of 5-60%; adding rare-earth salts of which the mole number is equivalent to 10-100% of the mole number of the sodium sulfanilate, and then performing stirring reaction at 40-95 DEG C for 2-24 hours; and filtering the obtained product, washing, and drying to obtain a powdered target product lanthanum sulfanilate. The rare-earth complex rubber anti-aging agent is applied in rubber preparation. According to the invention, the preparation method of the rare-earth complex rubber anti-aging agent is simple and easy to implement; and the rare-earth complex rubber anti-aging agent can obviously decelerate aging of rubber, can be singly used or compounded with other anti-aging agents for use, and has the advantages of causing no pollution to a rubber product, prolonging the scorching time of a rubber material, lowering the viscosity of the rubber material and the like.

The invention discloses a high-performance natural rubber/styrene-butadiene rubber composite material. The raw materials include: natural rubber, styrene-butadiene rubber, rare-earth isoprene rubber, zinc oxide, stearic acid, sulfur, benzoyl peroxide, and an accelerator CZ, accelerator DM, accelerator NOBS, antioxidant, light calcium carbonate, magnesium oxide, calcium hydroxide, graphene oxide, bamboo charcoal powder, aluminum silicate, diatomaceous earth, sodium montmorillonite, benzyl triphenyl Phosphorous chloride, polyethylene glycol. The high-performance natural rubber/styrene-butadiene rubber composite material proposed by the invention has high strength, good heat resistance and wear resistance, can meet the use requirements of various fields, and has a long service life.