Tire reclaimed rubber is often used for the production of ordinary plastic sheets. Zinc oxide is an indispensable chemical compounding agent in tire reclaimed rubber sheet formulations. Adding zinc oxide to the rubber sheet can improve the processing technology of the tire reclaimed rubber and improve the mechanical properties of the rubber sheet. What is the specific effect of adding zinc oxide in the plastic sheet formula? How much is the most appropriate and how best to use?
First, let's look at the important role of zinc oxide in the formulation of reclaimed rubber products:
1. Zinc oxide can be used as an activator or vulcanization accelerator in the formulation of reclaimed rubber products. Its role is to activate the entire vulcanization system and increase the vulcanization efficiency.
2. Zinc oxide can stabilize the vulcanization network to improve the thermal properties and aging resistance of the rubber compound;
3. Zinc Oxide can also be used as an acid-absorbing agent in the formulation of reclaimed rubber products. During the curing process, zinc oxide can absorb some acidic substances produced by the sulfurization reaction.
The addition of zinc oxide to the tire reclaimed rubber sheet is intended to increase the vulcanization speed of the entire vulcanization system, and to improve the heat resistance and aging resistance of the rubber sheet, thereby prolonging the service life of the rubber sheet.
Tire reclaimed rubber is used as a renewable resource for the recovery and reprocessing of used tires. The compound itself contains a certain amount of zinc oxide. Therefore, the zinc oxide content of this part needs to be taken in consideration when designing the rubber compound formula. Usually, the amount of zinc oxide is used in 100 parts of tire reclaimed rubber. In 2-3 servings.
When zinc oxide is added to rubber reclaimed rubber tires, a certain amount of stearic acid is usually added. This is because zinc oxide reacts with stearic acid to form zinc soaps and increases the solubility of zinc oxide in rubber compounds. At the same time, it forms a complex with the accelerator. This complex is particularly active. It reacts with sulfur to form a very strong vulcanizing agent, which can increase the vulcanization efficiency of the entire vulcanization system. It is generally necessary to add about 1.5 parts of stearic acid while adding 2 to 2.5 parts of zinc oxide.
Zinc oxide can be used as vulcanizing agent, activator, reinforcing agent and coloring agent in rubber sheet products processed with tire reclaimed rubber as the main raw material. Nano zinc oxide has larger surface area and stronger activity than common zinc oxide. The mechanical strength of the rubber sheet can be significantly improved, and the abrasion resistance, smoothness, and aging resistance of the rubber sheet can be improved. The amount of the rubber product including the rubber sheet is about 40% of the ordinary zinc oxide.
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