Tread reclaimed rubber is a high-glued and high-strength product in tire reclaimed rubber. It is widely used in rubber products industry; ordinary rubber sheet has no requirement for oil resistance and high and low temperature resistance of rubber compound. Most rubber sheet processing enterprises will A certain proportion of tread reclaimed rubber is used in natural rubber and styrene-butadiene rubber to reduce production costs. What kind of compounding agent will be used in the ordinary rubber sheet formulation containing tread reclaimed rubber? What is the role?
Reference formula: 40 parts of natural rubber; 40 parts of styrene-butadiene rubber; 40 parts of tread reclaimed rubber; 2.5 parts of sulfur; 5 parts of zinc oxide; 2 parts of stearic acid; 1.5 parts of accelerator M; 1 part of accelerator D; 1 part; 30 parts of carbon black; 6 parts of motor oil; 103 parts of barite powder; 60 parts of calcium carbonate; 1 part of paraffin; total, 333 parts.
Several questions about the conventional rubber sheet formulation with tread reclaimed rubber.
1. Can the amount of tread reclaimed rubber continue to increase?
Tread reclaimed rubber is a tire reclaimed rubber processed from waste tire tread. Its effective rubber hydrocarbon content, mechanical strength and wear resistance are superior to ordinary tire reclaimed rubber. It is mainly used in natural rubber and styrene-butadiene rubber. The ordinary rubber sheet can reduce the production cost of a certain proportion, and can also improve the plasticity, fluidity, safety of vulcanization and scorch of the rubber compound. However, although tread reclaimed rubber is the leader in tire reclaimed rubber products, its rubber content is basically about 35%, which is different from natural rubber. Excessive use of reclaimed rubber will reduce the elasticity and mechanical of ordinary rubber sheets. Strength, so it is best not to increase the amount of tread reclaimed rubber in the formulation.
2. Why is a large amount of barite powder filled in ordinary rubber sheets containing reclaimed rubber?
Barite powder, namely barium sulphate powder, is a commonly used filler in the rubber industry, which can reduce the cost of raw materials and improve the process parameters of ordinary rubber sheets. Under normal circumstances, the finer the particle size of the barite powder used in the rubber sheet, the easier it is to disperse in the rubber compound, the better the filling effect, and the better the mechanical properties of the ordinary rubber sheet containing the tread reclaimed rubber.
3. What is the role of stearic acid in the formulation of ordinary rubber sheets?
It is well known that stearic acid and zinc oxide in the formulation of rubber products are basically a relationship of "coke is not divorced", and the combination with zinc oxide can activate the entire vulcanization system and play a role of softening and lubricating. But in the above formula, stearic acid also has an important identity: as a modifier of barite powder. Barite powder is a commonly used filler in the rubber industry. It can exert greater value after surface activation treatment. The use of stearic acid to modify barite powder in ordinary rubber sheet containing reclaimed rubber can further improve the rubber sheet. Mechanical properties.
Adding a certain proportion of tread reclaimed rubber to the ordinary rubber sheet produced by natural rubber and styrene-butadiene rubber can effectively reduce the cost, but the addition of tread reclaimed rubber will affect the mechanical strength of the rubber sheet to a certain extent, which can be formulated. The adjustments include rubber selection, compounding agent, etc., wherein the sulfur vulcanization system is selected for the purpose of obtaining a rubber sheet with higher mechanical strength and better wear resistance. Do you have any questions about the tread reclaimed rubber/natural rubber/styrene-butadiene rubber and the reference formula for the production of ordinary rubber sheets?