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Water-based silicone resin
2024-04-11
Water-based silicone resin is a silicone resin emulsion with water as the dispersion medium. At present, it is widely used in silicone modified coatings, such as silicon modified acrylic emulsion, silicon modified polyurethane emulsion, silicon modified polyester emulsion, etc. The introduction of silicone in traditional polymer emulsion can enhance its aging resistance, waterproof, high and low temperature resistance, hardening and other properties. In the process of emulsion polymerization, silicone chain segments are introduced into the molecular structure of high molecular polymers. Commonly used silicone precursors are silane coupling agents, such as silane coupling agent 171,560,570, etc. These silane coupling agents are all trifunctional alkoxy structures. In the aqueous system, the alkoxy groups are hydrolyzed into hydroxyl groups, and the hydroxyl groups are further dehydrated and condensed to form a crosslinked structure. When the crosslinking degree is too large, the stability of the emulsion will be affected, resulting in gelation and unusable, therefore, there are certain restrictions on the amount of silane coupling agent. Generally, the amount is 1 ~ 10%. If the amount is too small, the modification effect is not obvious. If the amount is too large, the stability of the emulsion will be affected. The effect of silicon modification is limited or even not obvious.
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