How to choose good smooth effect of matting agent

2021-09-21   Pageview:219

(1) Usually the surface of the organic treatment of the matting agent, the feel will be better than without treatment.
(2) particle size and particle size distribution. Generally speaking, the finer the particles of matting agent, the finer the feel in the paint film. The narrower the particle size distribution, the fewer large particles, the better the feel to a certain extent.

 

 

 

 

 

 

 

 

 

 

It is possible to connect to another electron with greater electronegativity in the same molecule or another molecule. This bonding bond is called a hydrogen bond. This kind of hydrogen bonding also often occurs in the adsorption of pigments to polymers. For example, organic pigments and individual inorganic pigments do not have surface active groups, but they have hydrogen bond donors and acceptors, such as esters, ketones, and ethers. Classes can accept protons. If the polymer dispersant is a polyamine or polyester compound, it can be firmly adsorbed on the surface of the organic pigment through the interaction of many hydrogen bonds.

The interaction of polar groups 110. The polarizing or polarizable groups on the surface of the organic pigment particles and the same polarizing or polarizable groups on the anchoring group of the polymer dispersant are also between Interaction will occur, but this force is often very weak. If the dispersant polymer has many such polarizing groups, the fastness of this interaction will be greatly increased.

The interaction between the hydrophobic groups In an aqueous dispersion, the hydrophobic group end of the polymer can interact with the hydrophobic surface of the organic pigment or the hydrophobic group that has been adsorbed on the surface of the pigment. The hydrophobic base of this dispersant must have enough length and not too small, otherwise the hydrophilic group will be too strong to hinder the interaction pp wax melting point between the hydrophobic groups.

In solvent-based coatings, the polymer dispersant can be adsorbed on the surface of the pigment particles by van der Waals force, but the anchor group of the dispersant must be insoluble in the dispersion medium, and the extended chain must be soluble in the dispersion medium. This kind of adsorption is mostly achieved by the dispersing medium-insoluble polymer as other groups that are compatible with the anchor block and the dispersing medium.

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