Method of Adding Co-Formula Silane Coupling Agent to Coatings to Ensure their Storage Stability

Due to its special structural composition, silane has gradually become an indispensable component of coating and ink systems. Either as an additive or as a primer for coating alone, it will give excellent performance to coatings and inks. The consequences of not adding silane correctly are that the coating cannot be kept for a long time and the storage period is extremely short.

In the case of acrylate coatings, for example, copolymerization of acrylic acid and styrene monomers with Co-Formula silane coupling agents results in the synthesis of Co-Formula silane coupling agent-based acrylate emulsions, which can be made into room temperature cross-cured acrylate coatings. A typical addition of a silane coupling agent to a coating is to polymerize only a small portion of the copolymerized monomer premix in a reactor and then slowly add the remainder from a buffer tank.

Typical steps are as follows.

1. Add water, surfactant and retarder to the reactor.
2. Add 5%-10% of copolymer monomer premix (without silane coupling agent) to the reactor.
3. Heat the above mixture to the best temperature that the manufacturer has, the typical temperature control is about 65℃-75℃.
4. Add all catalysts and initiators to the reactor.
5. Control the rate of addition of the remaining copolymer monomer premix to the reactor, with a typical time range of 4-6 hours.
6. Add additional silane coupling agent to the buffer tank when 10% of the copolymer monomer premix remains. Mix the silane coupling agent and the remaining 10% of the copolymer monomer premix completely and continue adding to the reactor at a controlled rate.
7. After adding the copolymer monomer premix, maintain it for a sufficient time to obtain the maximum degree of polymerization.

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