Physical indexes of powder coating anti-mildew agent BJ-78

2021-10-26   Pageview:328

Appearance: light white powder
Active ingredient: heterocyclic compound
Active substance content: 75%
Fineness: 200 mesh
Solubility: slightly soluble in water, can be evenly dispersed in water-based, coating and other dispersion systems

 

 

 

 

 

 

 

 

 

 

 

The inhibitory effect of quinone polymerization inhibitors can be seen. When the quinone core has an electron-withdrawing group, the electron affinity increases, that is, the redox potential is increased, and it is easy to inhibit the polymerization of chain radicals with strong power supply capability. On the contrary, montan wax for sale when the quinone nucleus has an electron-donating group, its electron affinity is reduced, that is, the redox potential is reduced, and the inhibition of the same chain of free radicals will be weakened.

The steric effect of the substituents on the quinone ring will reduce the polymerization inhibition efficiency. From the point of view of the electronic effect, the inhibition efficiency of tetrachlorobenzoquinone to methyl radical is worse than that of benzoquinone. As for the tetramethylbenzene complex, it pushes electrons. The superposition of steric effect and steric hindrance makes the polymerization inhibition effect very poor. In the same way, the activity of fused-ring quinone will decrease in the order of

benzoquinone>naphthoquinone>phenanthrenequinone>anthraquinone.

Phenolic inhibitor
Polyphenols and substituted phenols are widely used to inhibit the polymerization of acrylic acid and its esters, acrylonitrile, styrene, methyl styrene and diene monomers, but must have oxygen dissolved in the monomers to show the inhibition effect . The inhibition mechanism of phenolic polymerization inhibitors is that monomer free radicals are first oxidized to peroxy radical ROO·, then ROO· oxidizes phenol to semiquinone, and finally oxidizes to quinone.

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