Choose of matting agent for powder coating

2021-09-18   Pageview:394

There are wax matting agent, non-wax matting agent and matting curing agent.

Wax-type matting agent is non-reactive and produces matting mainly through physical effects such as miscibility with film-forming substances.

Extinction curing agent extinction principle is the use of powder coating formula in two different reaction activity curing agent, a reaction activity is large, fast reaction speed, while the other reaction activity is low, slow reaction speed, due to the reaction speed difference and the difference in compatibility between the reaction products, resulting in microscopic rough surface, diffuse reflection of light and achieve extinction.

By adjusting the amount of resin and matting curing agent, it is possible to control the gloss of the coating film, which is more convenient to use.

 

 

 

 

 

 

 

 

 

 

 

The role of surfactants in the post-polymerization stage is basically to maintain the stability of the latex. For example, the extraction and removal of residual monomers, the packaging, storage, and transportation of the latex, and the next application process need to maintain the stability of the latex.
Surfactant in emulsion

The most basic work in the polymerization process

Can make the produced emulsion, mst ultimate wax additive

Within the controlled particle size range. The lipophilic and hydrophilic emulsifier can obviously affect the formation of a clean emulsion of the surfactant model, with no residue or a minimum amount of residue. Many studies on the mechanism of the emulsion polymerization process have shown that surfactants as emulsifiers have an important influence on the formation of emulsions based on the mechanism of free radical polymerization.

The molecular structure of surfactants can be described as a hydrophobic “tail” and a hydrophilic “head”.
Surfactants are usually divided into four categories according to the charge of the group of the linker: anionic surfactants, the hydrophilic group is an anion, and the group of the linker can be carboxylate, sulfonate, sulfate, ether Sulfate, (ether) phosphate, succinate, etc. Cationic surfactants, the hydrophilic group is cationic, such as various structural types of quaternary ammonium salts and amine salts. Non-ionic surfactants, this type of surfactants will not dissociate into ions in aqueous solutions, and its effectiveness has nothing to do with pH, ​​such as polyoxyethylene ethers with alkyl aryl groups or fatty alcohols in molecular structure, alkyl glycosides, and sorbus Alcohol esters and so on. Amphoteric surfactants contain both anionic and cationic groups in their molecular structure. Usually they contain amino and carboxyl groups in the hydrophilic group.

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