Matting agent selection for traditional solvent-based coatings
Because of the organic solvent, film-forming shrinkage, matting is easy, although due to the different resin system and film thickness of such coatings, the use of matting agent also differs. But the generality is large, mainly to adjust the amount of matting agent and particle size on. High pore volume of synthetic silica gel is effective. In order to prevent the matting agent in the varnish precipitation, wax treatment of silica matting agent is preferred.
Emulsion polymerization in North America consumes various emulsifier quantities
In addition to these, nonylphenol polyoxyethylene ethers (NP EOs)
So far, it is the most important product among A PEOs. In 1995, Europe consumed about 75,000t . It is estimated that the entire emulsion polymerization industry will consume about 11,000t APEOs . They are so widely used because of their emulsification efficiency, economy, ease of use and more than 40 years of experience.
Due to their chemical properties, the controversy over the potential environmental impact of A PEOs and NP EOs due to mass production has lasted for many years. The research on environmentally friendly alternatives is one of the main topics in Western Europe.
The role, classification and characteristics of emulsifiers, polarity amide wax
Surfactants are now widely used in various technical fields and people’s daily lives, but not all surfactants can be used in emulsion polymerization. Only those surfactants that have an effective stabilizing effect on the polymer emulsion system without affecting the polymerization reaction are suitable as emulsifiers for emulsion polymerization. Surfactants not only play a major role in the emulsion polymerization process, but also have a considerable impact on the application of latex . The role of surfactants in emulsion polymerization is diverse, such as: solubilizing water-insoluble monomers; monitoring the mechanism of particle nucleation; monitoring the number of nucleated particles to control the polymerization rate; maintaining colloids during particle growth The stability; control the average particle size and particle size distribution of the final latex.
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