The release agent is a functional substance between the mold and the finished product. The release agent is chemically resistant and does not dissolve when in contact with the chemical components of different resins (especially styrene and amines). The release agent also has heat resistance and stress properties, and is not easy to decompose or wear; the release agent adheres to the mold without being transferred to the processed part, and does not hinder painting or other secondary processing operations. Due to the rapid development of injection molding, extrusion, calendering, molding, lamination and other processes, the amount of release agent has also been greatly increased.

The release agent is an interface coating used on the surface of two objects that are easy to adhere to each other. It can make the surface of the object easy to detach, smooth and clean.

The release agent is widely used in various molding operations such as metal die casting, polyurethane foam and elastomers, glass fiber reinforced plastics, injection molded thermoplastics, vacuum foamed sheets and extruded profiles. During molding, sometimes other plastic fillers such as plasticizers will bleed out to the interface, then a surface remover is needed to remove it.

Theoretically, the release agent has a large tensile strength, so that it is not easy to polish when it is in frequent contact with the molded resin. This is especially true when there are frosted mineral fillers or fiberglass reinforcement in the resin. The release agent is chemically resistant and does not dissolve when in contact with the chemical components of different resins (especially styrene and amines). The release agent also has heat resistance and stress properties, and is not easy to decompose or wear; the release agent adheres to the mold without being transferred to the processed part, and does not hinder painting or other secondary processing operations. The specific principle of the release agent is as follows:

1. The polar chemical bond and the mold surface interact to form a regenerative adsorption film;

2. The silicon-oxygen bond in the polysiloxane can be regarded as a weak dipole (Si + -O-). When the release agent is spread into a single orientation on the mold surface, the molecule adopts a unique extended chain configuration;

3. The free surface is covered by alkyl groups in a densely packed manner, and the demolding ability increases with the alkyl density; but when the alkyl group occupies a larger steric hindrance, the extended configuration is limited, and the demolding ability will be reduced;

4. The molecular weight and viscosity of the release agent are also related to the release ability. When the molecular weight is small, the spreadability is good, but the heat resistance is poor.

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