Usage:
1Pre treatment method for pigments and fillers
The method of pre coating titanium ester coupling agent on the surface of pigment fillers, although cumbersome, has a good treatment effect. Dissolve the coupling agent in a small amount of benzene solvents such as toluene and xylene, add pigment fillers, and heat up to about 100 ℃ under high-speed stirring (about 1000r/min) for about 0.5 hours, so that each pigment 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.
2Direct addition method
During the paint making process, coupling agents are directly added before high-speed dispersion. Dissolve the weighed coupling agent in solvents such as gasoline and xylene, disperse it into the organic base material, add pigments and fillers for high-speed dispersion, and then prepare the coating according to the usual method.
Water based coatings use water-soluble coupling agents, and the treatment method is as described above, using water as the solvent.
consumption
In theory, the amount of coupling agent used is to allow all hydrophilic reactive groups in the coupling agent to react with the hydroxyl or proton groups provided by the pigment and filler. There is no need to be excessive, but in practice, the most suitable amount should be determined based on the particle size and surface functional groups of the pigment and filler. The relationship between viscosity and the amount of coupling agent can be determined using viscosity measurement method. The point where viscosity decreases the most is the most appropriate amount of titanium acid ester. Based on experience, the dosage of coupling agent should be 1% to 2% of the solid pigment and filler in the coating. The finer the particle size and larger the surface area of the pigment filler, the more coupling agent is used.
Conclusion: Different functional groups of titanium ester coupling agents can be designed according to the needs of the coating industry, making them specific or multifunctional additives.
The main ones are:
Good dispersion and wetting function can significantly improve the dispersibility of most inorganic and organic pigments and fillers in organic matrix materials, and is particularly effective in dispersing carbon black, phthalocyanine blue, iron red, medium chromium yellow, etc. Good anti sinking performance and improved storage stability.
It can shorten the number of grinding passes and time, and the same grinding time can make the particles grind finer.
Improve the adhesion of paint film to various substrates such as metal, glass, and inorganic materials, enhance friction resistance, improve impact resistance, and increase flexibility.
It can significantly increase the coloring strength and reflective ability of the coating, improve the gloss of the paint film, and increase the covering power. Titanium ester coupling agent is a multifunctional additive, but it also needs to undergo practical application tests to achieve the best effect. Titanium ester coupling agents can also be used in the ink industry, similar to their role in coatings.
