Demoulding is an important process for forming rubber products, which directly affects the appearance and quality of the product. Recycled rubber molding products will be added with molding agents in the production 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?
1. The role of release agent
The release agent is used to prevent the product from adhering to the vulcanization process of the rubber product, so that the rubber product can be successfully demolded without tearing. The main function of the mold release agent is to make the mold release operation easier, to prevent the rubber products from being damaged due to mold release, so as to obtain a smooth and smooth product, and to ensure the multiple use of the mold.
2. Main requirements of release agent
The release agent requires good thermal stability and chemical inertness; it does not corrode the surface of the cavity, and there is no residual decomposition; the release effect is good, and the product is not damaged; semi-permanence is good, the cavity surface has strong adhesion, and lasts for a long time; does not affect the product Color and performance; no gas, non-toxic, etc., no impact on product quality; easy to use, easy to apply or add glue.
3. Application and precautions of release agent
The mold release agent is divided into an external mold release agent and an internal mold release agent. The outer mold release agent is directly applied to the mold, and the inner mold release agent is directly added to the rubber compound, which can not only play the role of mold release, but also improve the fluidity of the rubber compound.
After the rubber release agent is added to the rubber, the product can be easily demolded without pollution to the surface of the mold and the product, improving the demolding efficiency and prolonging the service life of the mold.
The release agent in most liquids is acidic, and acid-sensitive pigments are prone to discoloration; when an alkaline filler is used, it will react with the acid release agent, resulting in an increase in the viscosity of the mixed glue, but it does not affect the release effect; In the high-filler system, the amount of release agent should be appropriately increased, but it should not be increased too much, otherwise curing will be delayed; the amount of release agent can be adjusted appropriately according to the thickness of the reclaimed rubber molded product.
When using a release agent, whether it is a new mold or an old film, it is necessary to remove the rust, oil and impurities on the surface, so that the surface of the mold is highly clean, and then apply or spray the release agent. Apply the release agent evenly, and the coating should not be too thick.
When rubber product manufacturers produce recycled rubber molded products, they should choose a suitable release agent and strictly follow the operation process to enable the product to be released smoothly.
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