The vulcanized rubber powder products processed from waste rubber products (mainly used tires) are extremely low in price. The use in antistatic nitrile rubber sheets can significantly reduce the production cost; however, the addition of vulcanized rubber powder will affect the vulcanization of antistatic rubber sheets. Performance and Mooney viscosity, how can this be solved? How does the vulcanized rubber powder affect the physical and mechanical properties of the nitrile antistatic rubber sheet? How to properly use vulcanized rubber powder in nitrile antistatic rubber sheet to reduce cost? Xiaobian today will work with you to unveil the answers to these questions.
2. Effect of vulcanized rubber powder on physical and mechanical strength of nitrile antistatic rubber sheet
(1) Tensile properties
Tensile properties are one of the important indicators for measuring rubber products, including tensile strength, elongation at break and 300% modulus. Generally, the rubber powder with larger particle size has poor compatibility with the rubber compound, and the reinforcing effect in the rubber compound is deviated. Therefore, the amount of the vulcanized rubber powder is increased, and the tensile strength of the antistatic rubber sheet is gradually decreased; the vulcanizing agent in the vulcanized rubber powder and The rubber hydrocarbons on the surface of the rubber powder react with the nitrile rubber to form a chemical crosslink. The crosslink density of the rubber compound increases. The tensile stress of the nitrile antistatic rubber sheet increases with the increase of the amount of the rubber powder, but the crosslink density increases. It also inhibits the molecular motion of the nitrile rubber, and the elongation at break is gradually reduced.
(2) tear performance
Tear strength is another important parameter to measure the physical and mechanical properties of rubber products. In the production process of nitrile anti-static rubber sheet, a small amount of vulcanized rubber powder has a hindrance to crack propagation, and the tear strength of the rubber compound is improved to some extent. When the amount of vulcanized rubber powder is continuously increased to a certain peak, the rubber compound is delivered. The increase in joint density and the concentration of stress can result in a decrease in the tear strength of the antistatic sheet.
3. Usage and dosage of vulcanized rubber powder in nitrile anti-static rubber sheet
Aiming at the influence of vulcanized rubber powder on the vulcanization process and mechanical properties of anti-static rubber sheet, Xiaobian put forward the following points, and hope to eliminate the negative impact of rubber powder. 1 Adjust the amount of vulcanizing agent and accelerator in the antistatic rubber sheet filled with vulcanized rubber powder, reduce the concentration of vulcanizing agent and accelerator in the whole formula, and use the aftereffect accelerator if necessary; 2 add a small amount of scorch retarder to improve coke Burn safety and reduce the probability of scorch; 3Select high-grade vulcanized rubber powder as much as possible to improve the reinforcing performance of vulcanized rubber powder in nitrile anti-static rubber sheet and improve the physical and mechanical properties of nitrile rubber sheet; The test reasonably controls the amount of vulcanized rubber powder.
In summary, the filling of vulcanized rubber powder in the antistatic rubber sheet with nitrile rubber as the main raw material has advantages and disadvantages. The rubber product manufacturers need to adjust the rubber plate formula reasonably and control the amount of vulcanized rubber powder to reduce the cost. The comprehensive performance of the nitrile antistatic rubber sheet is adjusted to the optimum state.