Polyurethane is a strong polar polymer material. It has strong adhesion with metals and polar polymer materials. Without a release agent, it is difficult for the product to be released from the mold. Commonly used release agents include silicone rubber, silicone ester, silicone oil, soap and paraffin, etc. Non-polar polymer materials such as polytetrafluoroethylene, silicone rubber, polystyrene, polyethylene and other materials can also be used to make molds, so as to avoid mold release. To wipe or spray the release agent process.
Traditional mold release agents are prepared with organic solvents. In recent years, water-based mold release agents are being developed at home and abroad. Some varieties such as Longderun water-based mold release agents have been put into the market. They are non-toxic, odorless, non-flammable, and do not pollute the environment. and other characteristics, as well as a high-quality release agent that can be used for multiple products at one time.
Polyurethane mold release agents are divided into two types: external mold release agents and internal mold release agents.
In order to easily remove the product from the mold during molding, the coating agent applied to the surface of the mold is called an external mold release agent.
The internal mold release agent is added to the PU formula, and migrates to the interface between the foam and the mold during each molding, so as to achieve the mold release effect.
The ideal release agent should have good thermal stability and chemical stability, not corrode the mold, and no decomposition products remain on the surface of the mold. etc. Minimize mold cleaning time as much as possible; harmless, safe, easy to operate and low cost.
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