1, anti-mildew, humidity and heat resistance, dustproof, anti-corrosion, moisture-proof, pollution resistance.
2, easy to clean, quick construction, easy maintenance, low cost.
3, strong adhesion, good flexibility, high hardness, impact resistance.
4, glossy paint film, fine, excellent resistance to scrubbing, good resistance to Aspergillus niger, Aspergillus flavus, Aspergillus miscellaneous and other mold resistance.
Free radical photopolymerization is particularly sensitive to molecular oxygen and is prone to oxygen inhibition. It is not sensitive to water, ammonia bases and other nucleophiles; cationic photopolymerization does not have the problem of oxygen inhibition, but water vapor, ammonia bases and other nucleophiles will Stable combination with cationic active center, leading to polymerization inhibition.
After the completion of the cationic photopolymerization, protic acid may still remain in the coating, which has long-term harm to the coating itself and the substrate.
The active species produced by cationic photolysis are super protic acid and Lewis acid. Among them, super Lewis acid is generally the direct product of photolysis, and super protic acid is obtained by super Lewis acid or carbocations and alcohols obtained by photolysis. Active hydrogen material reaction is obtained indirectly. Super strong protic acid easily initiates the polymerization of epoxy or vinyl ether monomers. The ring-opening polymerization process of epoxy and vinyl ether initiated by these super protic acids and Lewis acids is basically the same as the traditional cationic polymerization of epoxy. What we are concerned about is how oxidized hdpe wax to generate these active species through light.
Cationic photoinitiators can be divided into onium salts, metal organics, and organosilanes. Among them, sulfur salts and iodine salts are the most representative, and there have been many reports on practical applications. 1. Salt-transporting cationic photoinitiator
Salt cationic photoinitiators mainly include three types: diazonium salt, molybdenum iodide salt and sulfur U salt. The counter anion of the sales salt is BF 7, PF. , AsF. , SbF. Such special ions, because they have very weak nucleophilicity, meet the basic conditions of cationic photoinitiators, which is why zinc salt cationic photoinitiators are generally more expensive.
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