Barium sulphate used in the rubber industry is white powder at normal temperature and pressure, excellent in heat resistance, acid resistance and alkali resistance. It is insoluble in water, acid, alkali and other organic solvents, and can improve the mechanical strength and surface gloss of rubber products; Recycled rubber is used as a substitute for raw rubber. It is often used in the production of rubber products. It is often inseparable from the combination of barium sulfate. In the production process of recycled rubber products, the role of barium sulfate is the same as in the original rubber. How to use recycled rubber products. Is barium sulfate better?
1. The role of barium sulfate in reclaimed rubber products
Barium sulphate can be used as a filler in the production of reclaimed rubber products, and also has a certain reinforcing effect, significantly improving the acid and alkali resistance of recycled rubber products, improving the strength and hardness of recycled rubber products, and improving the rigidity and wear resistance of products. When the reclaimed rubber product is filled with barium sulfate, the aging resistance and weather resistance of the product can be enhanced, and the surface smoothness of the reclaimed rubber product can be improved, and the produced rubber product is not easily aged and becomes brittle.
2. Application skills of barium sulfate in reclaimed rubber products
(1) Not all recycled rubber products can use barium sulfate
There are many kinds of reclaimed rubber products, among which butyl reclaimed rubber has high chemical stability and can be used to produce various acid and alkali resistant and chemical resistant products and reduce production costs. Among them, butyl acid and alkali products are mostly filled with barium sulfate to improve the acid and alkali corrosion resistance of the reclaimed rubber; however, in practical application, barium sulfate is insoluble in organic solvents such as acid and alkali, but soluble in Strong acid and concentrated sulfuric acid, therefore, when using recycled rubber to produce rubber products that have been exposed to strong acid or concentrated sulfuric acid for a long time, barium sulfate cannot be used alone to improve the acid and alkali resistance of the product.
(2) Different amounts of barium sulphate in different types of recycled rubber products
Barium sulphate can improve the acid and alkali resistance of rubber compounds, increase the proportion of rubber products and reduce the production cost in the production of reclaimed rubber products. In the actual application process, the proportion of addition needs to be determined according to the performance requirements of recycled rubber products. The filling amount is 1-200 parts. between. Usually, the amount of barium sulfate in the tape product is about 25 parts, the filling amount of barium sulfate in the acid-resistant reclaimed rubber hose can be increased to 30 parts, and the amount of barium sulfate in the latex glove should be controlled between 10-15 parts, the conveyor belt The amount of barium sulphate filled up to 50 parts, and only about 10 parts of barium sulphate is needed in the inner tube.
Barium sulphate plays an important role in the production of reclaimed rubber products, but nano-precipitated barium sulphate is generally not used because of complicated processing process, difficulty in controlling dispersibility in rubber compound, and high production cost, especially modified nano-precipitated barium sulfate. Recycled rubber products are produced. Choosing the appropriate index of barium sulfate and rationally controlling the amount of barium sulfate can not only improve the mechanical strength and gloss of the recycled rubber products, but also reduce the production cost.