Theoretical Requirements Of Mold Release Agent

Update:2023-02-17 00:00
The mold release agent has a high tensile strength so it is not easy to burnish when it is in constant contact with the molding resin. This is especially true when there are frosted mineral fillers or glass fiber reinforcements in the resin. Mold-release agents are chemically resistant and do not dissolve when in contact with different resin chemical compositions, especially styrene, and amines. The release agent also has heat and stress resistance, and is not easy to decompose or wear; the release agent adheres to the mold and does not transfer to the workpiece to be processed, and does not hinder painting or other secondary processing operations. The specific working principle of Mold Release Agent is as follows:
1. Polar chemical bonds interact with the surface of the mold to form an adsorption film with regenerative power;
2. The silicon-oxygen bond in polysiloxane can be regarded as a weak dipole (Si+-O-). When the release agent spreads on the surface of the mold into a single orientation arrangement, the molecules adopt a unique extended chain configuration;
3. The free surface is covered by the alkyl group in a densely packed manner, and the release ability increases with the density of the alkyl group; however, when the alkyl group occupies a large steric hindrance, the extended configuration is restricted, and the release ability will decrease;
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.