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How Mold Release Agent Works

Update:2022-08-15 00:00
Summary:

Mold Release Agent has high tensile strength so that it does not easily buff when in constant contact with the molding resin. This is especially true when there are frosted mineral fillers or glass fiber reinforcements in the resin. The release agent is chemically resistant and does not dissolve in contact with different resin chemistries (especially styrene and amines). The release agent also has heat and stress properties, and is not easy to decompose or wear; the release agent adheres to the mold without being transferred to the part being processed and does not interfere with painting or other secondary processing operations. The specific working principle of the release agent is as follows:

1. The polar chemical bond interacts with the mold surface to form an adsorption-type film with regenerative power;

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

3. The free surface is covered by the alkyl group in a densely packed manner, and the demolding ability increases with the density of the alkyl group; but when the alkyl group occupies a large steric hindrance, the stretching configuration is limited, and the demolding 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.