Usage method of coupling agent

Titanium ester coupling agents can undergo chemical reactions on the surface of pigments and fillers, forming a single molecular layer to play a bridging role for each molecule, so the dosage is small and the effect is large. In order to evenly distribute a small amount of titanium ester coupling agent on the surface of the pigment and filler, effective usage methods should be adopted, and the following principles should be followed: do not add additional surfactants, as they will interfere with the reaction of titanium ester at the filler interface, in order to achieve their intended effect.

According to the structural type, water resistance, actual usage objects and occasions of coupling agents, different methods should be adopted. The following are several usage methods:

1. Pre treatment method for pigments and fillers:

The method of pre coating titanium ester coupling agent onto the surface of pigments and fillers may be cumbersome, but it yields better results.

The method is:Dissolve the coupling agent in a small amount of hydrocarbon solvents such as toluene and xylene, add it to the pigment and filler, and stir at high speed (about 1000 rpm) to around 90 ℃ for about half an hour, so that each pigment and filler particle can be coated with a layer of coupling agent. After the pigment filler is coated with a coupling agent, the coating can be prepared according to the usual method.

2. Direct addition method:

The method of directly adding coupling agent before high-speed dispersion in the paint making process.

The method is:Dissolve the coupling agent in solvents such as gasoline and xylene, then disperse it into an organic base material. Add pigments and fillers for high-speed dispersion, and prepare the coating according to the usual method.