How to control the shrinkage rate of tire rubber?

To control the shrinkage rate of tire rubber, you can start from the following aspects:

1、 Raw material selection and formula adjustment

Raw material quality: Select high-quality tire collagen materials and avoid using rubber materials with poor quality or excessive fillers to reduce shrinkage rate.

Formula adjustment: By adjusting the formula of tire rubber, such as adding appropriate amounts of surfactants, plasticizers, and processing aids, the elasticity and wear resistance of the rubber material can be improved, thereby controlling the shrinkage rate.

2、 Optimization of processing technology

Sulfurization process: Sulfurization is an important step in tire rubber processing, and vulcanization temperature and time have a significant impact on shrinkage rate. The vulcanization temperature and time should be strictly controlled to avoid excessive or insufficient vulcanization temperature causing an increase in shrinkage rate.

Mold design: Mold design should be reasonable, taking into account the difference between the linear expansion coefficient of rubber and the linear expansion coefficient of metal models, to ensure accurate mold size and reduce shrinkage rate.

Pressure control: During the processing, the pressure should be appropriately controlled to ensure that the tire rubber flows fully in the mold and fills the mold, reducing shrinkage rate.

3、 Equipment selection and maintenance

Equipment selection: Select equipment and molds suitable for tire rubber processing to ensure equipment accuracy and stability, in order to reduce shrinkage rate.

Equipment maintenance: Regularly maintain and upkeep equipment and molds to ensure that they are in good condition and avoid an increase in shrinkage rate due to equipment aging or wear.

4、 Control of other influencing factors

Plasticity of rubber material: The better the plasticity of rubber material, the smaller the shrinkage rate. Therefore, the plasticity of the rubber material should be appropriately controlled during the processing.

Injection amount of raw materials for vulcanized products: The injection amount of raw materials for vulcanized products also has an impact on shrinkage rate. When the quality of raw materials is greater than 5% to 10% of the product quality, the shrinkage rate is relatively stable. Therefore, the injection amount of raw materials should be reasonably controlled.

Product shape and size: The shape and size of the product can also affect the shrinkage rate. For example, the shrinkage rate of thin products is greater than that of thick products. Therefore, when designing tires, the influence of the shape and size of the product on the shrinkage rate should be considered.

In summary, controlling the shrinkage rate of tire rubber requires starting from multiple aspects such as raw material selection and formula adjustment, processing technology optimization, equipment selection and maintenance, and control of other influencing factors. By comprehensively considering these factors and taking corresponding measures, the shrinkage rate of tire rubber can be effectively controlled, and the quality and performance of tires can be improved.