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.

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.