Natural rubber and compound rubber

Natural rubber is a natural polymer compound with polyisoprene as the main component. Its molecular formula is (C5H8)n. 91% to 94% of its components are rubber hydrocarbons (polyisoprene), and the rest are proteins, Non-rubber substances such as fatty acids, ash, sugars, etc. Natural rubber is the most widely used general-purpose rubber. Compound rubber: Compound rubber refers to the natural rubber content of 95%-99.5%, and adding a small amount of stearic acid, styrene-butadiene rubber, butadiene rubber, isoprene rubber, zinc oxide, carbon black or peptizer. Compounded rubber. Chinese name: Synthetic rubber English name: synthetic rubber Definition: A highly elastic material with reversible deformation based on synthetic polymer compounds.

1. Classification of rubber

Rubber is mainly divided into three categories: natural rubber, compound rubber, and synthetic rubber.

Among them, natural rubber and compound rubber are the main varieties we currently import; synthetic rubber is extracted from petroleum, which is not considered for the time being.

Natural rubber refers to rubber obtained from natural rubber-producing plants. Compounded rubber is obtained by adding a little synthetic rubber and some chemical products on the basis of natural rubber.

Natural rubber is divided into standard rubber and smoked sheet rubber according to different manufacturing processes. Standard rubber is standard rubber. For example, China's standard rubber is Standard rubber of China, abbreviated SCR. Similarly, there are SVR, STR, SMR and so on.

There are also different grades of standard glue, such as SVR3L, SVR 5, SVR10, SVR20, SVR 50... etc.; according to the size of the number, the larger the number, the worse the quality; the smaller the number, the better the quality (it is important to distinguish between good and bad quality). The factor is the ash and impurity content of the product, the less ash, the better the quality)

Smoked sheet glue is Ribbed Smoked Sheet, which refers to flaky rubber made of smoke, abbreviated as RSS, this abbreviation is different from standard glue, it is not divided according to the place of origin, and the expression is the same in different places of origin.

There are also different grades of smoked sheet glue, RSS1, RSS2, RSS3, RSS4, RSS5. Similarly, RSS1 is also of the best quality, and RSS5 is of the worst quality.

compound rubber

It is made by adding a little synthetic rubber and some chemical products on the basis of natural rubber. The commonly used compound rubber formula is like this, such as Malaysia's compound rubber SMR Compounded Rubber 97% SMR 20 (Malaysian standard rubber) + 2.5% SBR (styrene butadiene rubber, a kind of synthetic rubber) + 0.5% stearic acid (stearin) acid).

Compound rubber depends on the natural rubber that constitutes its Z main component, and it is called compounding. As above, the main component of compound rubber is SMR 20, so it is called Malaysia No. 20 standard rubber compounding; there are also tobacco sheet compounding and standard rubber compounding. .

Third, the use of rubber

Make tires, rubber shoes, hoses, tapes, wire and cable insulation and sheathing, and other general-purpose products.