BYK-333 silicone surface additive provides good substrate wetting by reducing the surface tension of the coating, even for difficult substrates, and good anti-cratering properties, and it strongly increases surface slip as well as scratch and anti-stick resistance.
BYK-333 prevents the formation of Benard swirls and improves leveling and gloss. It can be used universally in all solvent-borne, solvent-free and aqueous coating systems. Due to its excellent compatibility with all base systems, it does not cause clouding problems in clear coats.
Peroxygen macromolecular initiator
Peroxygen macromolecular initiators are mainly produced by reacting dibasic acid chloride and sodium peroxide, or reacting with dibasic hydrogen peroxide to directly obtain peroxides with oligomerization degree. It can also be oligomerized by polycondensation of dibasic acid chloride and dihydric alcohol. Things.
In addition to the fischer tropsch wax process use of monomer synthesis to prepare macromolecular peroxides, the polymer of vinyl monomers can be heated and cracked under the action of oxygen or ozone to obtain macromolecular peroxides, such as polypropylene and ozone at room temperature. Under the reaction, the formation of macromolecular peroxides. At present, peroxygen macromolecular initiators mainly include acyl peroxides, modified acyl peroxides, peroxy esters and peroxy ethers.
The structure of peroxygen macroinitiator
Modified Acyl Peroxide
Peroxy ester peroxy ether
The AT RP method can be used to prepare block copolymers and graft copolymers. There are two commonly used methods. One is to synthesize a certain polymer by the AT RP method. After the reaction is over, use this polymer as a macroinitiator to initiate the polymerization of the second monomer. For example, Yuan Jinying et al.  first prepared Br- by the AT RP method. PSt-Br, and then Br-PSt Br as the macroinitiator, realizes the atom transfer radical polymerization of p-nitrophenyl methacrylate, and then undergoes hydrolysis and acidification to obtain polymethacrylic acid b polystyrene b-Polymethacrylic acid (PM A Ab-PSt-b-PM AA) ABA type amphiphilic block copolymer.
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