Demoulding agent selection commonly used demoulding agent has inorganic, organic and polymer three categories.

Inorganic release agent, such as talcum powder, mica powder and clay, white clay and other compounds as the main component configuration, mainly used for rubber processing of film, semi-finished anti-adhesive with isolation agent.

Organic release agents include fatty acid soap (potassium soap, sodium soap, ammonium soap, zinc soap, etc.), fatty acid, paraffin, glycerin, vaseline, etc.

High polymer release agent, including silicone oil, polyethylene glycol, low molecular weight polyethylene, their release agent efficiency and thermal stability is much better than organic release agent.

Release agents are usually powder, semi-solid and liquid, powder and semi-solid can be like wax grease coated on the surface of the mold with a brush or hand.The liquid can be sprayed on the surface of the mold with a spray or brush to form an isolation film.Liquid release agent to spray is preferred.

International industrial developed countries mostly use metal spray can filling release agent.Because of the good sealing performance of the metal spray can, it can avoid the oxidation of the release agent or mixing with impurities, and ensure the purity of the release agent when leaving the factory.Large injection molding equipment installed in the room, the environmental temperature change is small, the use of spray release agent has no impact.However, the mold temperature of the molding should be considered, and the release agent with good thermal stability should be selected. The thermal decomposition temperature of the release agent is generally required to be higher than the mold temperature of the molding.Otherwise, carbonization and condensation will occur.High-grade products and the need for secondary processing (such as spray painting and printing) to choose suitable for secondary processing of the release agent.In order to prevent environmental pollution, to choose not easy to burn, smell and toxicity of small release agent.Economy is an important factor that can not be ignored in the selection of release agent.Poor quality release agent 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 the spray release agent of high quality, the price is higher, but the comprehensive economic benefit is high.

To sum up, the key points of selecting release agent are:

1, excellent demoulding, for spray demoulding agent surface tension between 17 ~ 23 N/m.

2, with heat resistance, heat does not occur carbonization decomposition.

3, stable chemical performance, no chemical reaction with molding products.

4, do not affect the secondary processing properties of plastic.

5, do not corrode mold, do not pollute products, smell and toxicity is small.

6, smooth and beautiful appearance;

7, easy to coating, high production efficiency;