Natural Rubber Encyclopedia

Method for improving stiffness of natural rubber-pressed semi-finished rubber compound

Create Date:2020-04-27 09:16:10Click volume:317
Method for improving stiffness of natural rubber-pressed semi-finished rubber compound

Natural rubber has high mechanical strength, good elasticity and resilience, and can be used to produce rubber products such as rubber outsoles, tire treads, and sidewalls. The rigidity of the semi-finished products directly affects the performance and service life of natural rubber products. In actual production, natural rubber has insufficient stiffness, and semi-finished molded products are prone to problems such as pattern collapse. Therefore, rubber product manufacturers need to take certain measures to improve the stiffness of semi-finished rubber molded products.

1. Stiffness of rubber compound and molding process

The stiffness of the compounded rubber is an important indicator to measure the quality of the compounded rubber. It is an expression of rigidity. In the actual production, the stiffness is not enough, which has a great impact on the subsequent rubber product molding and other processes, especially in the production of high hardness Process of rubber products. The natural rubber molding process is the process of pressing the hot-melted natural rubber into a film with a patterned surface and a certain cross-sectional shape through a calender. The semi-finished product for molding requires clear patterns, accurate dimensions, and no bubbles. The stiffness of the rubber is not good, and the semi-finished product of the molding is prone to defects.

2. How to improve the stiffness of natural rubber semi-finished products

When improving the stiffness of the semi-finished products of natural rubber molding, rubber product manufacturers can consider both the formulation and the production process.

(1) Improve the process to improve the stiffness of rubber

When the natural rubber is subjected to the molding process, in theory, the higher the elasticity of the rubber compound, the worse the plasticity and fluidity. Properly increasing the plasticity of the natural rubber can reduce the probability of natural rubber deformation to a certain extent; Stiffness will be affected again. Therefore, in the process of natural rubber mixing 2LLYY427, it is necessary to reasonably control the mixing time and the mixing temperature. Properly increasing the roller temperature and reducing the roller speed can avoid the problem that the over-refining of the rubber affects the stiffness of the semi-finished product.

After the processing of semi-finished natural rubber products is finished, rubber product manufacturers can cool them in a clean and ventilated environment to reduce the temperature and prevent scorch while reducing the thermoplasticity and deformation of the semi-finished products. Semi-finished products have problems such as pattern collapse.

(2) Adjust the formula to improve the stiffness of the rubber compound

To improve the stiffness of natural rubber semi-finished products, rubber product manufacturers can also improve the stiffness of semi-finished products by adjusting the rubber content of the formula and using compounding agents that can improve the stiffness of the rubber compound. Under normal circumstances, natural rubber is excellent in elasticity and recovery performance. Reasonably controlling the rubber content of natural rubber products and appropriately reducing the rubber content can improve the rubber stiffness. Appropriate addition of reclaimed rubber and ointment in the formulation of rubber products can increase the stiffness of the rubber; appropriate increase in the amount of carbon black can reduce the shrinkage of the rubber and improve the stiffness of the semi-finished natural rubber molding; in addition, the use of clay in the formulation of natural rubber products , Calcium carbonate and other fillers can also improve the stiffness of semi-finished products to a certain extent.

In actual production, natural rubber can also be used to produce foamed rubber products such as foamed soles. At this time, it is not suitable to use carbon black, magnesium carbonate and other compounding agents to improve the stiffness of the rubber. This requires special attention. Do you have any better suggestions for improving the stiffness of natural rubber semi-finished products? The editor looks forward to communicating with more friends in the rubber industry.