The weighted inner tube is a light water tire. It is an indispensable tool for vulcanizing retreaded tires. It has high requirements for heat resistance, aging resistance, and flex fatigue resistance. Most weighted inner tubes are processed from natural rubber as the main raw material. . Natural rubber is much inferior to butyl rubber in heat resistance, gas permeability resistance, chemical stability, ozone resistance, etc., but butyl rubber itself is expensive, poor in processing performance, and poor in self-adhesiveness. Domestic butyl rubber production Not high, so butyl rubber is not an ideal raw material for the production of weighted inner tubes. In actual production, natural rubber can be combined with butyl reclaimed rubber in an appropriate ratio to produce weighted inner tubes to improve performance and reduce costs.
1. The significance of adding butyl reclaimed rubber to the inner tube
Butyl rubber and natural rubber are difficult to achieve co-vulcanization. Butyl reclaimed rubber has small molecular weight, irregular molecular size, and large polarity. When blended with natural rubber, it can penetrate and diffuse at the two-phase interface to form an interface transition layer, so that the two rubbers can be co-vulcanized; and the vulcanization performance of the combined rubber is good. , Butyl/natural rubber weighted inner tube has better overall performance.
From the performance of the finished product, adding a certain proportion of butyl reclaimed rubber to the weighted inner tube with natural rubber as the main raw material can improve the processing performance of the rubber material, and improve the heat resistance, chemical resistance, and aging resistance of the finished product. After mixing with butyl reclaimed rubber 2YLYY1220, the aging resistance of the weighted inner tube is significantly improved, which can significantly reduce the loss caused by the aggravated early damage of the inner tube and better guarantee the quality of retreaded tires.
In terms of processing performance, butyl reclaimed rubber is superior to butyl rubber and natural rubber in terms of plasticity, fluidity, finished product dimensional stability, aging resistance, and rubber mixing and vulcanization process performance. The blending effect of butyl reclaimed rubber and natural rubber is good. After blending with butyl reclaimed rubber, the processing performance of the natural rubber weighted inner tube is better, which can effectively reduce the defective rate of residual light water tires and reduce the power consumption during processing.
The weighted inner tube is indispensable in the vulcanization, pressurization and heating process of retreaded tires, and is a consumable in the processing of retreaded tires. From the perspective of raw material cost, the price of butyl reclaimed rubber is much lower than that of natural rubber and butyl rubber. After a certain proportion of butyl reclaimed rubber is mixed with natural rubber, the cost of raw materials for the weighted inner tube is significantly reduced. At present, most of my country's butyl raw rubber relies on imports, and the use of butyl reclaimed rubber to replace part of butyl rubber to produce weighted inner tubes can also alleviate the shortage of butyl rubber resources in my country.
2. Techniques for adding butyl reclaimed rubber to the inner tube
When adding butyl reclaimed rubber to the weighted inner tube of natural rubber, the appropriate butyl reclaimed rubber should be selected according to the specific performance requirements of the weighted inner tube, and the amount of butyl reclaimed rubber should be reasonably controlled; the appropriate rubber compounding agent should be selected, and the quality of the finished product should be further optimized by adjusting the formula .
In actual production, up to 50 parts of butyl reclaimed rubber can be added to 100 parts of natural rubber. The vulcanized rubber has good physical and mechanical properties and meets the requirements of the weighted inner tube for rubber heat resistance, aging resistance, flexural flexibility, etc. need. From the formulation point of view, the weighted inner tube produced by natural rubber/butyl reclaimed rubber generally uses sulfur-accelerator vulcanization system, commonly used accelerator CZ/M, combined with zinc oxide, stearic acid; reinforcement system can use general carbon black and clay ; Adding an appropriate amount of tackifier such as tackifying resin can further improve the self-adhesiveness of the rubber compound and meet the needs of the production process for the weighted inner tube.
With regard to the production technology of the weighted inner tube mixed with butyl reclaimed rubber, the editor will continue to discuss with you when I have the opportunity.
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