Selection of mold release agents Commonly used mold release agents are inorganic, organic and high polymer.

Inorganic mold release agents, such as talc powder, mica powder, and clay, white clay, etc., are the main components of the compound. They are mainly used as release agents for film and semi-finished products in rubber processing.

Organic mold release agents include fatty acid soaps (potassium soap, sodium soap, ammonium soap, zinc soap, etc.), fatty acids, paraffin, glycerin, petrolatum, etc.

Polymer release agents, including silicone oil, polyethylene glycol, low molecular weight polyethylene, etc., their release agent efficiency and thermal stability are much better than organic release agents.

The release agent is usually divided into powder, semi-solid and liquid. The powder and semi-solid can be applied to the surface of the mold with a brush or hand like wax grease. The liquid can be applied to the surface of the mold with a tool such as spray or brush, thereby forming a separation film. The liquid release agent is preferably sprayed.

International industrial developed countries mostly use mold spraying agents filled with metal spray cans. Due to the good sealing performance of the metal spray can, the release agent can be prevented from being oxidized or mixed with impurities, which can ensure the purity of the release agent when it leaves the factory. The large injection molding equipment is installed indoors, and the ambient temperature changes little, which has no effect on the use of spray release agent. However, the mold temperature of the compression molding should be considered, and a mold release agent with good thermal stability should be selected. The thermal decomposition temperature of the mold release agent is generally higher than the mold temperature. Otherwise, carbonization will occur. For high-end products and secondary processing (such as painting and printing), a release agent suitable for secondary processing should be selected. In order to prevent environmental pollution, it is necessary to select a mold release agent that is not flammable, and has low odor and toxicity. In the selection of mold release agents, economy is an important factor that cannot be ignored. Poor quality mold release agents will cause cracks and wrinkles on the surface of the product, affect the appearance of the product and the service life of the mold, and bring environmental pollution. Choose high-quality spray release agent, the price is higher, but the comprehensive economic benefit is high.

To sum up, the main points for selecting the release agent are:
1. Excellent mold releasability, the surface tension of spray release agent is between 17 ～ 23 N / m.
2. It has heat resistance and does not undergo carbonization and decomposition when heated.
3. The chemical properties are stable, and there is no chemical reaction with the molded products.
4. Does not affect the secondary processing performance of plastics.
5. Does not corrode the mold, does not pollute the product, and has low odor and toxicity.
6. The appearance is smooth and beautiful;
7. Easy to coat and high production efficiency;

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