Using vegetable oils in SBR and NR
Production of SBR / NR rubber compound using vegetable oils
Natural rubber (NR) (from latex (leachate) in Brazilian aerated sap in South Asia it is extracted. Despite the variety of synthetic rubbers, natural rubber is still widely used in used in the tire industry, the features of this tire are as follows:
- Optimal resistance to rupture
- Resistant to wear
- Optimal jumping
- Generate less heat
The above characteristics have led to the use of this rubber or its alloys properly widely used in rubber industry. But in addition to all the stated properties, natural rubber has disadvantages as well as undesirable resistance to fatigue and low resistance to atmospheric factors, which to overcome these disadvantages, the use of amplifiers Organic or inorganic in this rubber is unavoidable Styrene-butadiene rubber (SBR) is one of the most widely used synthetic rubbers, which is a polymer of two the monomer is styrene and butadiene, which is usually about 23.5% styrene.
These tires are usually under letters there are several well-known brands, the most famous of which is S Buna Compared to other synthetic tires, this tire is relatively inexpensive and in large quantities and volumes. Widely used in rubber industry, especially tire industry. Chemical resistance of this rubber , it is similar to natural rubber (NR) and due to its structural similarity and the presence of unsaturated groups easily with other Elastomers are alloyed As well as the energy required to stretch the sample Finds. This tire can be used in car tires, conveyor belts, washers, hoses and others.
Diverse products mentioned. This rubber is composed of amorphous and irregular polymerization and, like NR rubber, is subject to tension does not crystallize. For this reason, in the raw state, it has low tensile strength, but with increasing the filler of this defect is removed.
To strengthen this alloy, various fillers are used that soot it is one of the most widely used fillers in the rubber industry and about 90% of the soot produced in the world is used in the rubber industry goes.
This filler is added to the elastomer to increase the tear strength, modulus and corrosion properties and tire wear is to achieve a homogeneous and uniform distribution of filler in the matrix bed, as well as with the amount of required physical-mechanical properties of the plasticizer in the formulation of the final mixture becomes For this purpose and also for accepting different types of fillers in high volume inside the matrix 1 rubber, from base oil Used as a softener in the formulation of the mixture.
Base oils in industry rubber can be obtained from oil or non-oil sources.
Most of the base oil consumed in the world today from crude oil refining is obtained Because the bulk of the base oils used in the production of products rubber is obtained from oil sources, these oils also carry environmental pollutants with them , will have the characteristics of base oils obtained from oil depend on the type of crude oil and refining operations.
Since Crude oil contains various compounds such as paraffinic, naphthenic, aromatic and also hydrocarbons. Compounds are sulfur, base oils are also composed of these compounds. Use these base oils As a softener, it affects the properties and performance of the final product, because it increases the flexibility of the mixture. Finishes as well as improves the dispersion of various components within the rubber matrix