Coating dispersant classification – Low-molecular waxes

2021-09-24   Pageview:291

Low molecular wax is a variety of polyethylene (homopolymer or copolymer), polypropylene, polystyrene or other polymer modifiers as raw materials, by cracking, oxidation and a series of different properties of oligomers.

Its main products are: homopolymer, oxidation homopolymer, ethylene – acrylic copolymer, ethylene – vinyl acetate copolymer, low molecular ionomer and other five categories. Among them, polyethylene wax, the chemical name of polyethylene glycol, the English name PEG (Poly Ethylene Glycol) is most commonly used.

 

 

 

 

 

 

 

 

 

 

 

 

Adsorption double layer
A dual-layer control flocculation unit formed by a single polar-based wetting and dispersing agent

Deflocculation and control flocculation
The polar adsorption group of low molecular weight wetting and dispersing agent has a strong affinity for inorganic pigments, because inorganic pigments are usually metal oxides or compounds containing metal cations and oxygen anions, which are acidic, basic or amphoteric on the surface of the pigment particles. Both active centers, they have strong chemical adsorption to anionic or cationic wetting and dispersing agents composed of carboxyl and amino groups, and can form salts on the surface of the pigment and anchor firmly on the surface of the pigment. This kind of acid-base interaction is impossible for organic pigments, because the molecules of flash point of pe wax organic pigments are composed of C, H, O, N and other elements.

These atoms cannot be charged, so the surface of organic pigments does not look like inorganic Active centers like pigments. Therefore, traditional wetting and dispersing agents cannot stabilize organic pigment dispersions, and most of them are recommended for the dispersion of inorganic pigments.

For organic pigments, it is necessary to use a high molecular weight wetting and dispersing agent different from the low molecular weight wetting and dispersing agent.

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