Theoretical basis of mold release agent

The release agent is a kind of functional substance between the mold and the finished product. The release agent has chemical resistance and does not dissolve when it comes into contact with the chemical composition of different resins (especially styrene and amines). The release agent also has heat resistance and stress properties. not easy to decompose or wear The release agent is glued to the mold without transferring to the processed parts, which does not hinder the spray 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 is also greatly increased.

In theory, the release agent has a large tensile strength so that it is not easily polished when it is in frequent contact with the molded resin, especially when there are frosted mineral fillers or glass fiber reinforcements in the resin. The release agent is chemical resistant and does not dissolve when in contact with the chemical composition of different resins (especially styrene and amines). The release agent also has heat and stress resistance and is not easy to decompose or wear. The release agent is glued to the mold without being transferred to the processed parts, which does not hinder painting or other secondary processing operations. The specific action principle of mold release agent is as follows:

The main results are as follows: 1. the adsorption film with regenerative force is formed by the interaction between polar chemical bond and mold surface.

2. The siloxane bond in polysiloxane can be regarded as a weak dipole (Si+-O-). When the release agent spreads into a single directional arrangement on the mold surface, the molecule adopts a unique extended chain configuration.

3. The free surface is covered by alkyl groups, and the demoulding ability increases with the alkyl density. However, when the alkyl occupies a large steric hindrance, the stretching configuration is limited and the demoulding ability will be reduced.

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