Classification of soluble antimicrobial finishing agents

2021-11-04   Pageview:327

Common soluble antimicrobial agents are: aldehydes, phenols, alcohols, certain surfactants (such as quaternary ammonium salts), organic heterocyclic compounds (such as pyrazoles, pyrimidines, pyrroles), organometallic compounds (such as organic mercury compounds, organic copper compounds, organic zinc compounds, organic lead compounds, organic tin compounds and some other organometallic compounds), etc.

Since these types of antimicrobial agents will come off once washed, they cannot be used for textiles that require multiple washes and have long-lasting effects.

 

 

 

 

 

 

 

 

 

 

 

After the filler is surface-coated with coupling agent, the coating can be prepared according to the usual method.
Direct addition method Direct addition method is the method of directly adding ebs wax emulsion titanate coupling agent in the paint making process. The coating does not contain or contains only a few active groups such as hydroxyl and carboxyl groups, and the direct addition method can be adopted only when it is proved to be effective through experiments. Generally, it needs to be carried out in the following order:

①Weigh 0.5%~3% titanate coupling agent of pigment and filler;
②Add a small amount of solvent gasoline, petroleum ether, toluene or xylene to dissolve the coupling agent;
③ Disperse the coupling agent solution into the organic base material;
④Add people’s paint;
⑤ Add filler;
⑥Add other additives.

How to use chelating coupling agent
Chelating titanate coupling agent has good water resistance. It can be dissolved in organic solvents to coat pigments, fillers or directly used in oil-soluble base materials. You can refer to the method of using monoalkoxy titanate coupling agent, or coat pigments, fillers or fillers in the water phase. Use directly in water-based paint.
Chelating titanate coupling agents have good water resistance, but most of them are insoluble in water. Generally, three methods can be used to disperse it in the water phase: ① directly grind in a high-speed disperser to disperse it in water, ② use Surfactants make it dispersed in water. ③The chelating titanate containing phosphoric acid group, pyrophosphate group and sulfonic acid group can be quaternized with amine reagents and then dissolved in water (detailed in the section of chelating titanate coupling agent introduce), The use of titanate coupling agent in the water phase can also be divided into pretreatment method and direct addition method.

(1) Pretreatment method In order to prevent unnecessary side reactions, the chelating titanate coupling agent is coated on the surface blood of the pigment and filler in advance. Take 0.5% KR138s coated calcium carbonate operation method as an example and introduce as follows:
①KR138sl part and 0.5 part triethylamine are stirred and mixed to make quaternary ammonium salt;
② Disperse the above-mentioned quaternary ammonium salt of KR-138s into 600 parts of water;
③ Disperse 200 parts of calcium carbonate into the above-prepared quaternary ammonium salt aqueous solution;
Bake in an oven at 120°C overnight,

When the titanate coupling agent is used to coat and coat the inorganic substance, in order to ensure the coupling reaction is complete, there must be sufficient coupling time to achieve the best effect.

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