413results about How to "Shorten vulcanization time" patented technology

A golf ball comprises a solid core consisting of a center core and an outer core, wherein at least one of cores is made of a rubber composition comprising 100 parts by weight of a base rubber including. 60 to 100% by weight of a polybutadiene containing at least 60% by weight of cis-1,4-bond, having a Mooney viscosity (ML1+4 (100° C.)) of at least 52, and synthesized using a rare-earth catalyst, 10 to 60 parts by weight of an unsaturated carboxylic acid and / or a metal salt thereof, 5 to 80 parts by weight of an-inorganic filler, and an organic peroxide, and wherein the center core has a JIS-C hardness of 40 to 60 on its center and a JIS-C hardness of 55 to 75 on its surface and the difference therebetween is at least 10, the outer core is harder than the surface hardness of the center core, the cross-sectional hardness of 1 mm outside from the border between the center core and the outer core is from 65 to 85 on a JIS-C hardness, the surface of the outer core has a JIS-C hardness of 75 to 95.

The invention discloses a composite foaming agent, a preparation method thereof and application thereof. The composite foaming agent comprises azodicarbonamide, sodium bicarbonate and an auxiliary foaming agent in a weight ratio of (0.3-0.9):(0.2-0.6):(0.1-0.8). The auxiliary foaming agent is prepared by uniformly stirring attapulgite, zeolite and calcite, soaking the mixture in diluted hydrochloric acid of which the concentration is 0.5 to 6 weight percent, drying the mixture, crushing the dried mixture into powder, blending the powder and powdery white carbon black and uniformly stirring the mixture, wherein the weight ratio of the attapulgite to the zeolite to the calcite to the white carbon black is (0.3-0.8):(0.02-0.6):(0.1-0.8):(0.01-0.8). The composite foaming agent disclosed by the invention has relatively high liquidity and dispersibility, a low decomposition temperature and a long decomposition temperature period.

A multi-piece solid golf ball has a solid core obtained by molding and vulcanizing a rubber composition which includes (A) a base rubber containing a polybutadiene synthesized using a rare-earth catalyst, (B) an unsaturated carboxylic acid and / or a metal salt thereof, (C) an organic sulfur compound, (D) an inorganic filler and (E) an organic peroxide. The core is enclosed within a mantle of one or more layer which is made primarily of a thermoplastic resin and has a Durometer D hardness of 30 to 70. The mantle is enclosed within a cover which is made primarily of a thermoplastic polyurethane and which has a Durometer D hardness of 40 to 60 that is lower than the Durometer D hardness of the outermost layer of the mantle. This construction provides the golf ball with an outstanding rebound.

The invention discloses a vulcanized rubber for shoes capable of realizing high effective and fast vulcanization and a preparation method and a vulcanization process thereof. The vulcanized rubber isprepared from natural rubber, styrene-butadiene rubber, butadiene rubber, accelerator B, accelerator BM, accelerator DS, nanometer zinc oxide, rubber softening oil, sulphur, stearic acid, aging resister CD, carbon black N330, pine tar oil, solid coumarone, reclaimed rubber and pot clay. Compared with the prior art, the vulcanized rubber of the invention has suitable starting time of vulcanization,faster velocity of vulcanization and higher thermal oxidative aging property, the vulcanization efficiency is increased, and the heat-conducting property, processing safety and storage property of the rubber are increased in the vulcanization process; the provided vulcanization process can effectively shorten the vulcanization time, improve the vulcanization quality and increase the vulcanizationefficiency to 2-3 times of the original one.

The invention provides an oil soluble molybdenum-based precursor of a catalyst, a preparation method and application thereof, relating to the technical field of heavy oil hydrocracking catalysts and solving the problems of low catalytic hydrogenation activity and high cost of the existing catalysts. The preparation method for the precursor comprises the steps of (1) mixing a molybdenum source with water, reacting for 30-240 minutes at 70-90DEG C, and adding inorganic acid; (2) adding polycarbon alcohol into P2S5 in 5-15 minutes at 50-80DEG C, and reacting for 1-3 hours at 70-100DEG C; (3) adding the product of step (2) into the product of step (1), adding resin, and reacting for 4-8 hours at 70-110DEG C; (4) separating oil phase from the product of step (3) so as to obtain the target product. The precursor can form MoS2 active components through self sulfurization and in situ decomposition, is used in slurry reactor hydrocracking of poor heavy oil with high content of metal, carbon residue and sulfur, and can lower the yield of coke and keep a device to run for a long period.

The invention discloses an automobile rubber sealing strip and a preparation method thereof. The automobile rubber sealing strip comprises the following components in parts by weight: 55-80 parts of ethylene propylene diene monomer rubber, 4.5-8 parts of carbon black, 0.5-2 parts of zinc oxide, 1-2 parts of stearic acid, 3-5 parts of anti-aging agent, 0.5-1 part of ultraviolet-resistant agent, 1.5-3 parts of naphthenic oil, 3-8 parts of vulcanizing agent, 1.5-4 parts of accelerator, 1-2 parts of antioxidant, 1-2.5 parts of paraffin oil, 0.5-1 part of gamma-(methylacryloyloxy)propyltrimethoxy silane, 1.5-5 parts of filler and 0.5-1.5 parts of anti-scorching agent CTP. The automobile rubber sealing strip enhances the high temperature resistance, low temperature resistance, stability to light, ozone. oxygen and the like and other comprehensive properties of the product and improves the interface compatibility on the premise of keeping the original mechanical properties. The preparation method has the advantages of simple technique, short vulcanization time, lower energy consumption and lower production cost.

The invention relates to the field of a potting adhesive and particularly relates to a low-viscosity heat-conduction electronic potting adhesive applicable to each electronic element and a preparation method thereof. The heat-conduction electronic potting adhesive is formed by a component A and a component B in a weight ratio from 100: 90 to 100: 110; the component A comprises the following raw materials in weight percentage of 39.20-79.60% of heat-conduction inflaming retarding powder, 0.80-2.00% of color matching agent, 0.40-1.00% of silane coupling agent, 16.20-43.80% of liquid silicon oil and 3.00-14.50% of silane cross-linking agent; and the component B comprises the following raw materials in weight percentage of 39.20-79.60% of heat-conduction inflaming retarding powder, 18.00-57.80% of liquid silicon oil, 0.20-1.00% of silane coupling agent, 1.00-1.96% of color matching agent and 0.04-1.00% of catalyst. The low-viscosity heat-conduction electronic potting adhesive has lower viscosity, excellent mobility, good heat-conduction performance and high inflaming retarding grade; the potting requirement of a seam less than 0.02 mm can be met and the construction is convenient; and after the heat-conduction electronic potting adhesive is cured, the strength is good, and the dustproof, moisture-proof and vibration-proof performances are good, the electronic element can be effectively protected and the service life of the electronic element is prolonged.

The invention relates to ultralight graphene rubber foaming colloidal particles for shoe soles. The colloidal particles are prepared from, by weight, 60-65 parts of natural rubber, 8-12 parts of isoprene rubber, 8-12 parts of butadiene rubber, 6-8 parts of butadiene styrene rubber, 0.8-1.0 part of modified graphene, 0.08-0.12 part of poly N-vinyl acetamide, 0.8-1.0 part of silicone oil, 3.0-3.5 parts of inorganic nanoparticles, 1.2-1.5 parts of activated zinc oxide, 0.8-1.0 part of zinc stearate, 1.0-1.2 part of stearic acid, 0.8-1.0 part of a cross-linking agent, 2.0-3.0 parts of a flow assistant and 1.5-1.8 parts of a foaming agent. By adopting the ultralight graphene rubber foaming colloidal particles, the modified graphene is uniformly dispersed in all rubber materials, the rubber foaming colloidal particles have good heat stability, good abrasive resistance performance and good stretching intensity, the permanent compression deformation performance and the heat resistance shrinkage performance are improved, and 50% or above weight can be reduced.

A golf ball is characterized by comprising a molded and vulcanized product of a rubber composition as a constituent component, the rubber composition comprising 100 pbw of a base rubber composed primarily of a polybutadiene containing at least 60 wt % of cis-1,4-bond, having a Mooney viscosity (ML1+4, 100° C.) of at least 30, and synthesized using a rare-earth catalyst, 15-50 pbw of an unsaturated carboxylic acid and / or a metal salt thereof, at least 2 pbw of a processing aid having a highest melting point of up to 115° C., and at least two organic peroxides including an organic peroxide having the shortest half-life at 155° C. designated (a) and another organic peroxide having the longest half-life at 155° C. designated (b), a ratio of half-lives (bt / at) being at least 7 wherein at is the half-life of (a) and bt is the half-life of (b), a total content of the organic peroxides being 0.1-0.9 pbw per 100 pbw of the base rubber.

The invention relates to a preparation method for a novel rubber strip for sealing of automobile doors and windows and a product. The preparation method employs ethylene propylene diene monomers as basic materials with cooperation of certain amounts of carbon black, calcium carbonate, paraffin oil, zinc oxide, stearic acid, polyvinyl alcohol, high-molecular wax, compound antioxidants, dispersants, compound accelerants, vulcanizing agents, fire retardants and the like. The above materials are subjected to mixing, open milling and vulcanization technologies to obtain the rubber strip. The preparation method has advantages of simple formula, simple production technology, short vulcanizing time, high production efficiency, relatively low production cost, easy industrialization enforcement and the like. The rubber product for sealing is advantaged by good sealing performance, uniform structure, resistance to corrosion, resistance to high and low temperature, flame resistance, environment protection and comfort.

The invention provides a preparation method of hydrophobic white carbon black. The preparation method includes following steps: 1), allowing hydrolysis reaction: mixing silane coupling agent-vinyltriethoxysilane, organic solvent and water for hydrolysis reaction to obtain silane coupling agent hydrolysate, wherein the organic solvent comprises n-heptane and alcohol; 2), allowing modifying reaction: using an atomizer to atomize the silane coupling agent hydrolysate obtained in the step 1), mixing with white black carbon, drying an obtained mixture, and heating for modifying reaction to obtain the hydrophobic white carbon black. The preparation method is simple in preparation process, little in equipment investment, short in production period, high in labor production efficiency and easy forindustrialization and has high technical economic efficiency; the hydrophobic white carbon black is good in mechanical performance and high in hydrophobicity and can well improve processability of rubber when being applied to butadiene styrene rubber, vulcanizing time is shortened, mechanical performance of vulcanized rubber is improved, and wear resistance of rubber is enhanced.

The invention discloses an ethylene-propylene-diene monomer rubber waterproof roll. The ethylene-propylene-diene monomer rubber waterproof roll is prepared from the following raw materials in parts by weight: ethylene-propylene-diene monomer rubber, DOP (Dioctyl-Phthalate) thermal welding agent, carbon black, light calcium carbonate, stearic acid, zinc oxide, rubber accelerator, sulfur, processing oil, fire-retardant plasticizer, chlorinated polyethylene (CPE), white carbon black and rubber accelerator tetramethyl thiuram disulfide (TMTD). A production method of the ethylene-propylene-diene monomer rubber waterproof roll comprises the steps of banburying, filtering, compounding, thermal cracking, calendering, rolling, vulcanization and packaging. The ethylene-propylene-diene monomer rubber waterproof roll produced by the method has good ageing resistance, small possibility of cracking and good waterproof effect and has an inflaming retarding function, the initiation temperature exceeds 300 DEG C, and the ethylene-propylene-diene monomer rubber waterproof roll has no water-permeating phenomenon through permeable experiments.