The tire air tight layer is a breathable rubber layer in the tubeless tire, which is mainly used to prevent the leakage of compressed gas and maintain the tire air tightness. It is mostly made of chlorinated butyl rubber or brominated butyl rubber. Chlorinated butyl recycled rubber retains the basic performance characteristics of chlorinated butyl rubber and can replace some chlorinated butyl rubber to produce tire airtight layer rubber, reducing raw material costs; Reasonable design of tire airtight layer formula containing chlorinated butyl recycled rubber can further optimize product quality.
1. Common rubber raw material matching techniques for tire airtight layer
In actual production, the tire airtight layer requires the rubber material to have good airtightness, heat resistance, bending resistance, as well as good vulcanization and molding adhesion, and chlorinated butyl rubber is often used. Chlorinated butyl recycled rubber 2SLYY417 can be used in a suitable proportion with chlorinated butyl rubber, and if necessary, a certain amount of natural rubber can be used in combination with chlorinated butyl rubber/chlorinated butyl recycled rubber/natural rubber to produce tire airtight layer rubber, reducing costs and further improving the rubber process performance and product quality.
2. Key points in the design of the formula for adding chlorinated butyl recycled rubber to the tire airtight layer
(1) Vulcanization system: When using chlorinated butyl rubber/chlorinated butyl recycled rubber to prepare tire airtight layer compound, a thiazole based system based on zinc oxide can be used; When chlorinated butyl rubber/chlorinated butyl recycled rubber/natural rubber are used in combination, an alkylphenol disulfide system can be used to achieve good adhesive and flexural properties. Control the amount of zinc oxide among 3-5 parts; Stearic acid can serve as an activator or operating aid in vulcanization systems. Magnesium oxide can be used as an anti coking agent, and appropriately increasing its dosage can improve the bending resistance and flexibility of chlorinated butyl rubber vulcanizate.
In actual production, the guanidine sulfur system and thiourea vulcanization system can provide high matrix bonding strength, but their flexibility and processing safety are poor. The curing system of thiuram thiazole or sulfonamide is not conducive to improving the adhesive strength of the adhesive.
(2) Reinforcement system: when using chlorinated butyl rubber/reclaimed rubber to produce the air tight layer of tubeless tire, the same elastic reinforcement can be used, or the universal carbon black can be used together with heavy calcium and clay, and a certain amount of high abrasion resistant carbon black can be used when necessary. Reasonable design of the reinforcement filling system can improve the airtightness, heat resistance, flexural flexibility, and bonding performance of chlorinated butyl vulcanizate, with a dosage generally controlled among 50-100 parts.
(3) Viscosity increasing system: When using chlorinated butyl rubber/chlorinated butyl recycled rubber and rubber to prepare tire airtight layer compound, viscosity increasing resin can be used to increase the viscosity of the compound. Commonly used include phenolic resin and hydrocarbon resin. Phenol acetylene resin can also be used when the tire airtight layer adhesive has high requirements for molding adhesion; The combination of phenolic resin and hydrocarbon resin can also achieve good molding, vulcanization and bonding properties.
When using chlorinated butyl recycled rubber to replace some chlorinated butyl rubber in the production of tire airtight layers, there are still many issues that need to be noted. The editor will continue to share with you in the future.
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