Tire retreading is the process of retreading and processing the tires that have lost their use value. It is an important way of recycling the waste tires to make the waste tires have the use performance again. In actual production, recycled rubber powder can also be used in the process of tire retreading, which can not only further reduce the cost of raw materials, but also realize the recycling of waste rubber resources again. The ordinary vulcanized rubber powder and the improved activated rubber powder can be used in the process of tire retreading, and the specific mixing effect and dosage are different.
1. Application skills of vulcanized rubber powder in tire retreading
When vulcanized rubber powder is used to reduce the manufacturing cost during tire retreading, the physical and mechanical properties of retreaded tires will be affected by such factors as the type, fineness, amount of rubber powder, and the amount of impurities (fiber, metal, dust, moisture, etc.) contained in rubber powder. When vulcanized rubber powder is added to retreaded tire compound, the smaller the particle size of rubber powder is, the better the tear performance of the compound is. When natural rubber/cis polybutadiene rubber/styrene butadiene rubber blends are used to prepare retreaded tire compound, 5-10 phr of ordinary vulcanizate powder can be used to extend the driving distance of retreaded tires and reduce the cost of raw materials.
2. Application skills of activated rubber powder in tire retreading
Compared with ordinary vulcanized rubber powder, the surface modified activated rubber powder (mainly changing the surface structure, functional groups, surface energy, surface wettability, etc. of rubber powder) has a better mixing effect in the rubber compound, and can realize co vulcanization, thus improving the abrasion resistance, resilience, constant elongation, hardness, tear strength, aging resistance, etc. of the retread tire compound after mixing rubber powder, and reducing the tensile strength, elongation at break Influence of permanent deformation and aging resistance.
3. Reference formula of retreaded tire tread mixed with rubber powder
50 natural rubber, 50 styrene butadiene rubber, 20 activated modified rubber powder, 4 zinc oxide, 2 stearic acid, 1.1 paraffin, 0.5 antioxidant 4010, 0.5 antioxidant D, 0.4 antioxidant DFC-34, 30 carbon black N220, 20 carbon black N330, 3.9 pine tar, 1.2 accelerator DM, 0.4 accelerator M, and 2 sulfur; Total: 186 copies.
4. Methods to improve the physical and mechanical properties of retreaded tire compound mixed with rubber powder
In actual production, when rubber powder is used to reduce costs in the process of tire retreading, the amount of sulfur in the rubber can be appropriately increased, or a quick accelerator or sulfur free curing system such as peroxide can be used to improve the physical and mechanical strength of retreaded tire rubber powder 2ELYY122. In addition, the proper addition of hexamethylene tetramine, resorcinol, modified phenolic resin or ester coupling agent to the retreaded tire powder formula can improve the ability of the rubber to absorb small molecules such as sulfur and accelerator, so as to improve the physical and mechanical properties of retreaded tire rubber.
The reasonable use of rubber powder in the process of tire retreading can further reduce the cost of raw materials. Later, Xiaobian will continue to share with you the processing points and precautions of rubber powder mixed with retreaded tires.
Exclusive original article [commercial authorization] reprint, excerpt and excerpt in any form are prohibited without written authorization. Focus on Hongyun rubber: learn the process formula and raw material technology of producing rubber products from recycled rubber to help you reduce costs and increase profits