Bias tires, namely nylon tires, mainly include the tread, ply, buffer layer and bead parts. The tread includes the crown, shoulders and sidewalls. The performance requirements of different parts are different. In actual production, a certain proportion of tire rubber powder can be blended into the tread rubber of automobile bias tires to effectively reduce the cost of raw materials. The editor today shares with you two formulas for bias tire tread rubber mixed with vulcanized rubber powder.
1. Bias tire crown rubber
The tire crown rubber for bias tires needs to bear the full weight and direct friction on the ground to protect the plies and inner tubes. The rubber is required to have excellent wear resistance, tear resistance, cut resistance, wet skid resistance and aging resistance. , Low heat generation during driving; an appropriate increase in the amount of natural rubber can further improve the crown's cutting resistance, puncture resistance, and wet skid resistance. In actual production, rubber product manufacturers mix a small amount of vulcanized rubber powder into the tire crown formula of automobile bias tires, which can further improve the overall performance of the tire crown rubber while reducing costs.
20 parts of natural rubber, 30 parts of styrene butadiene rubber, 50 parts of butadiene rubber, 5 parts of vulcanized rubber powder, 5 parts of zinc oxide, 2.5 parts of stearic acid, 2 parts of antioxidant, 55 parts of carbon black, 6 parts of softener, sulfur 1.2 parts, 0.9 parts of accelerator CZ; total: 177.6 parts. Vulcanization conditions: 143℃×35min.
2. Bias tire sidewall rubber
The sidewall rubber for bias tires needs to withstand greater distortion during the driving process. It is a thin rubber layer attached to the sidewall of the ply. Its main function is to protect the ply from mechanical damage and moisture erosion.
50 parts of natural rubber, 45 parts of butadiene rubber, 15 parts of butyl vulcanized rubber powder, 4 parts of zinc oxide, 2 parts of stearic acid, 3 parts of antioxidant, 55 parts of carbon black, 5 parts of softener, 1.2 parts of sulfur, promotion 0.6 parts of NOBS; Total: 180.8 parts. Vulcanization conditions: 148℃×25min.
3. Advantages of mixed vulcanized rubber powder in bias tire tread rubber
Vulcanized rubber powder is processed from waste rubber products by mechanical method, freezing method and other crushing methods. According to the types of waste rubber, it can be divided into tire rubber powder, ethylene propylene rubber powder, nitrile rubber powder and butyl rubber powder 2YLYY1214. Recycle into various rubber products. In actual production, the use of vulcanized rubber powder in different parts of the bias tire tread rubber can not only reduce part of the raw material cost, but also improve the process performance, wear resistance and tear resistance of the rubber compound; realize the recycling of waste rubber resources.
4. Selection skills of vulcanized rubber powder for bias tire tread rubber
When mixing vulcanized rubber powder in different parts of the bias tire tread rubber, use tire rubber powder, such as crown rubber; it is recommended to choose 80-120 mesh vulcanized tire rubber powder, which has better mixing effect with rubber and compounding agents. , The overall performance of the finished tire is better. In addition, vulcanized butyl rubber powder can also be used in the bias tire tread rubber, which can reduce the cost and improve the heat resistance, water resistance and corrosion resistance of the sidewall rubber.
In actual production, vulcanized rubber powder can also be blended into other parts of the bias tire. Compared with vulcanized rubber powder, activated rubber powder has a better blending effect in rubber products and a larger amount. Later editors will have the opportunity to continue to share with you the activated rubber powder in different parts of the automobile bias tire tread rubber. Specific usage and dosage.
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