How to use polymer emulsion thickening agent?
1, Adjust the PH value of the system to be thickened to 7.5-8.5.
2, Add BJ-90 slowly to the thickened system under low speed stirring, and stop adding after reaching the specified viscosity.
Whether the polymer can be adsorbed on the surface of the pigment, the role played by the solvent is very important. Because the adsorption of the solvent on the solid phase can also be manifested in the adsorption of the polymer in different ways, the strength of the interaction between the solvent and the adsorbent should first be considered. Among the polar solvents, the polar solvent can be adsorbed on the hydrophilic Ti Oz in a larger amount, which hinders the adsorption of the polymer.
In polar and non-polar solvents, the configuration of perchlorovinyl resin polymer is different. In the acetone solvent, it forms a spherical configuration, which hinders its adsorption on the surface of hydrophilic pigments. If the pigment is replaced by hydrophobic carbon black, then the polymer will have an orientation effect on the surface of the pigment. This orientation effect causes the spherical polymer to expand in the interface layer and adsorb on the surface of the carbon black, such as III and IV. Toluene is a poor solvent for perchlorovinyl resin polymers. The polymer particles precipitate more and form a dense network structure. The polymer has a strong affinity with the pigment surface, so it is on the surface of hydrophilic pigments such as Ti Oz. More adsorption capacity, micronized pe wax such as Ⅰ and Ⅱ.
Harasaki Yuji explained  V~VII as follows: Benzene is a non-polar solvent in V, and the ether bond between TiO and polyoxyethylene has a strong attraction, so polyoxyethylene is on the surface of Ti Oz. The upper adsorption capacity is more (about 1mg/m²). In VI, CCL: is a very low polarity solvent, and the attraction between TiO: and the phenyl group of polystyrene is weak, so the adsorption capacity is small (about 0.85mg/m²).
In VI, low-polarity polystyrene and toluene, which also have phenyl groups, have a strong attraction. Even if polystyrene is adsorbed on TiO, it can be desorbed by toluene. The polarities of polyoxyethylene and water are very strong, greatly exceeding that of TiO 2. The affinity of ether to water is greater than that of TiO, and the affinity to ether groups is much greater, so the adsorption of polyoxyethylene on TiO 2 is zero.
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