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The main component of natural rubber is cis-1,4-polyisoprene. Rubber hydrocarbon accounts for 91%~94%. The rest is a small amount of protein, fatty acid, ash, sugar and other non rubber substances. It has high mechanical strength, good elasticity, flexure resistance, electrical insulation and other characteristics. Cis-1,4-polybutadiene rubber is the abbreviation of cis-1,4-polybutadiene rubber. It is polymerized from butadiene. Its cis structure content is more than 95%. It has the characteristics of high elasticity, good abrasion resistance, good cold resistance, low heat generation, good bending flexibility and good dynamic performance.

In actual production, natural rubber is often blended with cis polybutadiene rubber to prepare various rubber products. Why?

1. Effect of blending

The cold resistance, abrasion resistance, elasticity and dynamic properties of natural rubber products can be further improved by adding a proper amount of cis polybutadiene rubber in the production of rubber products with natural rubber as the main raw material. The blending of natural rubber 2YLYY428WFM with cis polybutadiene rubber can improve the roller behavior of cis polybutadiene rubber, increase viscosity, and further improve the tear strength and tensile strength of vulcanizate. In actual production, the tire made of natural rubber and styrene butadiene rubber can also improve the traction of the tire on the wet road surface, and reduce the chips and chips in the late aging period.

2. Use of blending rubber

The compound of natural rubber and cis-1,4-polybutadiene rubber can be used to prepare various vehicle tyres, conveyor belts, rubber hoses, rubber sheets, rubber shoes, etc. It can also be used to produce cushioning materials, cold resistant products, sponge rubber, etc. The compound has good process performance and better mechanical strength, wear resistance, tear resistance, aging resistance and other comprehensive indicators of the finished product. In actual production, natural rubber and cis-1,4-polybutadiene rubber can also be used together with appropriate amount of styrene butadiene rubber when preparing tires.

3. Precautions for rubber mixing

The blending of natural rubber and cis-1,4-polybutadiene rubber can improve the processing and application properties of the rubber compound. Pay attention to the following three problems when mixing: the compatibility between polymers can be micro heterogeneous, but must be macro homogeneous; The distribution of compounding agent in each phase of polymer should be reasonable; Vulcanization should be basically synchronous, and it is better to have cross-linking between interfaces.

4. Blending with other rubbers

Tyres are often used for natural rubber/polybutadiene rubber blends. In tire production, blending natural rubber/cis-1,4-polybutadiene rubber/styrene butadiene rubber can better balance the wear resistance, traction and rolling resistance of the tire during driving. On the whole, NR/BR/SBR blends can better complement the processing properties of rubber compound and the physical and dynamic properties of products.

Recycled rubber (mainly latex reclaimed rubber and tire reclaimed rubber) can also be appropriately mixed in the natural rubber/polybutadiene rubber blend to further improve the processing performance of the rubber compound and reduce the cost of raw materials, especially the plasticity and anti reversibility of vulcanization. Later, I will discuss relevant issues in more detail with you.