Butyl reclaimed rubber has excellent air tightness, heat resistance and chemical resistance, and is widely used to replace butyl rubber in the manufacture of automobile tire inner tubes, inner liners, etc., to reduce costs. Tire innerliner is very important to maintain tire pressure and ensure the normal use of tires, and the use of butyl rubber, chlorinated butyl rubber, brominated butyl rubber, etc., and the rational use of butyl reclaimed rubber can further improve the quality of finished products while reducing costs.
1. The blending method of butyl reclaimed rubber in the inner liner of tires
Butyl reclaimed rubber is made of waste butyl inner tube as raw material, made by crushing, desulfurization and other processes, and has good compatibility with other rubber, and can be used alone or with butyl rubber, chlorinated butyl rubber, brominated butyl rubber, natural rubber, etc. in appropriate proportions to prepare tire innerliners, such as butyl rubber + butyl reclaimed rubber, chlorinated butyl rubber + butyl reclaimed rubber, brominated butyl rubber + butyl reclaimed rubber, chlorinated butyl rubber + natural rubber + butyl reclaimed rubber, etc.
2. Chlorobutyl rubber/butyl reclaimed rubber produces tubeless tire innerliner rubber vulcanization formula
56 parts of chlorinated butyl rubber, 44 parts of butyl reclaimed rubber, 4 parts of zinc oxide, 0.8 parts of magnesium oxide, 1 part of stearic acid, 1 part of antioxidant D, 34 parts of carbon black N660, 12 parts of naphthenic oil, 0.8 parts of accelerator DM, 0.16 parts of accelerator TMTD, 1.6 parts of sulfur; Total: 155.36 shares.
3. Butyl reclaimed rubber production of tire innerliner rubber skills
(1) Formula design: When butyl reclaimed rubber is used in combination with other varieties of rubber to prepare tire innerliner compounds, sulfur-accelerator systems are mostly used, such as thiazole vulcanization system based on zinc oxide, or alkylphenol disulfide E4LYY430 system to obtain good adhesion and flexural properties. Use general carbon black such as N660 or N326 in combination with heavy calcium and clay, and add high wear-resistant carbon black if necessary to improve air tightness and flexural resistance; Fast-pressed carbon black improves processability, increases tensile stress, and reduces hardness and heat generation. Phenolic resin or hydrocarbon resin is added to improve the adhesion and molding adhesion of butyl reclaimed rubber compound.
(2) Production process
Mixing process: appropriately increase the mixing capacity during mixing, strictly control the mixing and debinding temperature, and ensure that the rubber is evenly dispersed.
Calendering process: The rubber should be fully preheated before calendering to ensure the uniformity of the inner liner after calendering.
Butyl reclaimed rubber is reasonably used in the production of tire innerliner rubber, and the physical properties of vulcanized rubber (such as tensile properties and tear strength) are maintained well, and the thermal and oxidative aging resistance and air tightness are excellent. The blending of butyl reclaimed rubber can improve the adhesion and rollability of tire innerliner compound, improve tear strength, reduce dynamic compression heat accumulation, improve the mixing and vulcanization process of rubber compound, and improve the durability of finished products. In the future, Xiaobian will continue to discuss with you the vulcanization formula of butyl reclaimed rubber in different use occasions for the production of inner liner liner of tubeless tires.
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