36results about How to "Improve vulcanization speed" patented technology

A rubber composition for a tread optimizing a vulcanization speed in a vulcanization step and, further, improving heat aging resistance is provided. A rubber composition for a tread comprising 20 to 90 parts by weight of silica, 0.5 to 2 parts by weight of (A) a guanidine vulcanization accelerator, 0.1 to 0.5 part by weight of (B) a thiuram vulcanization accelerator, and 0.5 to 2 parts by weight of (C) a sulfenamide vulcanization accelerator represented by the general formula (1): (wherein R is a linear alkyl group or a branched alkyl group having 1 to 18 carbons), based on 100 parts by weight of a rubber component.

The object of the present invention is to provide a rubber composition for tire treads which has a good vulcanization rate and excellent wet grip and fuel efficiency. As a means of solving the problems of the present invention, there is provided a rubber composition for tire treads containing 40 parts by mass or more of a solution-polymerized SBR diene having a Mw of 900,000 to 1.5 million and a styrene content of 35 to 45%. 100 parts by mass of rubber, compounded with 60 to 110 parts by mass of silicon dioxide satisfying all the conditions of (1) to (4) below, and relative to the silicon dioxide, compounded with fatty acid metal salts (except zinc salts) 2-8 mass % of the mixture formed with fatty acid ester. The conditions for the above silica are: (1) N2SA is 194-225m2 / g. (2) The specific surface area of ​​CTAB is 170-210m2 / g. (3) The relationship between the above-mentioned N2SA and the above-mentioned CTAB specific surface area is that the N2SA / CTAB specific surface area is 0.9 to 1.4. (4) DBP absorption is 190ml / 100g or more.

The invention discloses a high-temperature-resistant mildew-proof silicone sealant and a preparation method thereof. The high-temperature-resistant mildew-proof silicone sealant comprises the following components calculated in parts by weight: α,ω-dihydroxy polysiloxane 50 ~100 parts; 5~20 parts of reinforcing filler; 5~20 parts of methyl phenyl silicone oil; 40~100 parts of high temperature resistant filler; 0.05~0.2 parts of antifungal agent; 0.2-1 part of coupling agent; the α,ω-dihydroxypolysiloxane is α,ω-dihydroxypolydimethylsiloxane, α,ω-dihydroxypolydimethylsiloxane, phenyl substituted partial side chain methyl Mixture of dihydroxypolymethylphenylsiloxanes. The high-temperature resistant and mildew-resistant silicone sealant prepared by the invention has good elasticity, high tensile strength and elongation at break, and excellent high-temperature resistance and heat-and-humidity resistance.

The invention discloses a low-temperature-resistant anti-cracking power cable. The cable comprises a rubber skeleton, and the rubber skeleton comprises a serrated-edge-shaped annular skeleton. Each serrated concave corner of the outer side of the annular skeleton is fixedly connected with a V-shaped plate to to form a plurality of quadrilateral cavities; a first wire core and two second wire coresare arranged in the annular skeleton; the first wire core and the two second wire cores are twisted and then coated with a high-density polyethylene protective layer; third wire cores are respectively arranged in the quadrilateral cavities, and the outer side of the rubber skeleton is sequentially coated with a glass fiber woven layer, a heat preservation cotton layer, an aluminum belt interlocking armor layer and a butadiene styrene rubber outer sheath. The serrated-edge-shaped annular skeleton has a very good pressure-resistant buffer effect, and can well protect the wire cores in the skeleton; the V-shaped plate from forms a plurality of quadrilateral cavities to protect the third wire cores in the skeleton, and has very good pressure-resistant, tensile and torsional effects; the internal structure of the cable is more compact and tidy, and the cable is not liable to deform after being used for a long time.

Belonging to the field of rubber plastic products, the invention in particular relates to a composite functional reinforcing agent for rubber production and a preparation method thereof. The raw materials include: red mud, a conditioning agent and a dispersing agent. The conditioning agent is stearic acid and gypsum, the dispersing agent is calcium phosphate, and the weight ratio of the red mud, the conditioning agent and the dispersing agent is 8-12:0.8-1.2:0.8-1.2. The composite functional reinforcing agent provided by the invention realizes utilization of waste red mud, has a good reinforcing effect on rubber products, can partially replace carbon black and white carbon black, can completely replace other traditional inorganic filler (like potter's clay, ordinary silicon powder and calcium carbonate, etc) in the rubber formula of rubber products, also can serve as a rubber reinforcing agent and filler. At the same time, the composite functional reinforcing agent also has vulcanization promoting and flame retardant effects, thereby reducing the dosage of carbon black, a vulcanization accelerator, a flame retardant and other expensive raw materials involved in the rubber formula, lowering the production cost of rubber products, and improving the performance of the prepared product.

The invention relates to a salt corrosion resistant and twisting resistant double-shielded communication cable for ocean wind power and a manufacturing method of the communication cable. Each stranded copper conductor is wrapped in a salt corrosion resistant and twisting resistant extruded rubber insulation layer to form an insulated core; each two insulated cores are stranded to form a twisted pair of which the gaps are filled with fillers; each twisted pair is wrapped in a twisted pair copper foil shielding layer to form a twisted-pair group; the twisted-pair groups are mutually stranded to form a cable core; and the cable core is wrapped in a low-strength non-woven fabric longitudinal wrap, an inner sheath, a cable core copper foil shielding layer and an outer sheath in sequence from inside to outside. The communication cable provided by the invention adopts the low-strength non-woven fabric longitudinal wrap which completely fits the insulated cores in shape, so that gaps between the low-strength non-woven fabric longitudinal wrap and the insulated cores are eliminated, convenience is provided for stopping flame from spreading inwards under a combustion condition and the resistance to moisture impregnation is enhanced; and meanwhile, the low-strength non-woven fabric longitudinal wrap can ensure that the sheaths are not stuck to the insulated cores, and provides convenience for stripping the sheathes in a construction process without damaging the insulated cores.

The invention belongs to the technical field of rubber materials and preparation of the rubber materials, and particularly relates to a blending type rubber compound and a preparation method thereof. The rubber compound comprises, by weight, 75-85 parts of ethylene-propylene-diene monomer (EPDM), 15-25 parts of rubber type chlorinated polyethylene (CPE), 2-3 parts of dicumyl peroxide (DCP), 0.8-1.5 parts of triallyl isocyanurate (TAIC), 25-35 parts of talcum powder, 25-35 parts of N660, 4-6 parts of TP759, 1-1.5 parts of SA and 3-6 parts of ZnO. The rubber type CPE and the EPDM are mixed in a certain proportion and other assistants are added simultaneously to obtain the blending type rubber compound through corresponding preparation processes, so that chlorine elements are added on the molecular weight of the EPDM, and the modified ethylene propylene rubber (EPR) not only reserves corrosion resistance of the EPR, but also is provided with good physical and mechanical properties and processability. The problems of the poor oil resistance and high cost of the existing EPR can be solved.