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Reactive silicone leveling agent?

Sep 26,2024

Silicone has many advantages, such as good low temperature resistance, good weather resistance and strong flexibility, so the modification of silicone resin is often an important method to improve the performance of resin. The modification method is mainly grafting functional groups with the same reaction performance with resin, so that it can participate in the crosslinking reaction of resin, which is the reactive silicone agent.

In many ink coating formulations, when adding organosilicon additives, due to the spontaneous migration of organosilicon additives, when the paint film curing, the added organosilicon additives often remain on the surface of the paint film, so as to produce a certain pollution to the paint film, especially in the electronic industry and other systems, the consequences are particularly serious, reactive silicone came into being.

Reactive silicone can give the paint film a permanent feel, but its defect is that it will affect the repainting:

The following functional groups are usually used to modify organosilicon:

(1) hydroxymethyl (mainly used in two-component system, amino baking paint system).

(2) epoxy group (mainly used in epoxy system).

(3) acrylic base (mainly used in light curing system and unsaturated polyester resin system).

(4) In addition, there is a silicone acrylate leveling agent, is a copolymer of silicone acrylate and acrylate, its performance is similar to that of fluorine acrylate leveling agent. The methacrylate of silocarbon alcohol is generally prepared by the addition of single SiH and allyl methacrylate by anionic polymerization. By adjusting the length and content of the silica-containing chain segment, its performance can be adjusted in a wider range. For example, the silicon content can be changed from high to low through the change of the silicon chain segment. Can achieve wettability, improve the master feeling until used as anti-graffiti aid.


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