Demoulding is an important process for molded rubber products, which directly affects the appearance quality of the product. Recycled rubber molded products will be added with a release agent to ensure that the rubber products can be released smoothly. The release agent has a great influence on the release of rubber products, so what are the requirements for the release agent? How to choose a release agent?
In the vulcanization process of rubber products, the release agent is used to prevent the product from sticking to the surface of the mold, so that the rubber product can be released smoothly without tearing. The main function of the release agent is to make the demolding operation easier and prevent the rubber products from being damaged due to demoulding, so as to obtain a smooth and smooth product and ensure that the mold can be used many times.
The mold release agent needs good thermal stability and chemical inertia; it does not corrode the surface of the mold cavity, and there is no residual decomposition; the mold release effect is good, and the product is not damaged; semi-permanent, strong adhesion to the surface of the mold cavity, and long duration; no impact Product color and performance; no gas, non-toxic, etc., no impact on product quality; easy to use, easy to apply or add glue.
Mold release agents are divided into external mold release agents and internal mold release agents according to the method of use. After the release agent in the rubber is added to the rubber, the product can be easily demolded without pollution to the mold and the surface of the product, improving the demolding efficiency and prolonging the service life of the mold.
Most liquid release agents are acidic, and acid-sensitive pigments are prone to discoloration; when alkaline fillers are used, they will react with acidic release agents, resulting in an increase in the viscosity of the mixed glue, but without affecting the release effect; In the filler system, the amount of internal mold release agent should be appropriately increased, but it should not be increased too much, otherwise curing will be delayed; the amount of mold release agent can be appropriately adjusted according to the thickness of the reclaimed rubber molded product.
When using an external mold release agent, whether it is a new or old film, it is necessary to remove rust, oil, impurities, etc., to make the mold surface highly clean, and then apply or spray the mold release agent. Apply the release agent evenly, the coating should not be too thick.
When rubber product manufacturers produce reclaimed rubber molded products, they must choose a suitable release agent and strictly follow the operation process to enable the product to be released smoothly.
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