otherwise it will cause micro reticulation in the film and irreversible particle aggregation, which will reduce the viscosity and coarsen the particle size. Different ionic thickeners will change the charge of lotion. For example, cationic thickeners will have an irreversible effect on anionic emulsifiers and break the emulsion. An ideal emulsion paint thickener must have the following properties.

1. Low dosage and good viscosity

2. Good storage stability, no decrease in viscosity due to enzyme action, and no decrease in viscosity due to temperature and pH changes

3. Good water retention without obvious bubbles

4. No side effects on paint film properties such as scrub resistance, gloss, covering power, and water resistance

5. Will not cause pigment to coagulate

otherwise it will cause micro reticulation in the film and irreversible particle aggregation, which will reduce the viscosity and coarsen the particle size. Different ionic thickeners will change the charge of lotion. For example, cationic thickeners will have an irreversible effect on anionic emulsifiers and break the emulsion. An ideal emulsion paint thickener must have the following properties.

In the production process of latex paint, senlex hydroxyethyl cellulose (HEC) is used as a dispersant, thickener, and pigment suspension agent to stabilize the viscosity of the product, reduce clumping, make the paint film smooth and flat, and also make the latex paint have good rheological properties, can withstand high shear strength, and can provide good leveling, scratch resistance, and pigment uniformity. At the same time, HEC has excellent workability, and latex paint thickened with HEC has pseudoplasticity. Therefore, the use of brush coating, roller coating, filling, spraying and other construction methods has the advantages of labor-saving, not easy to clean, and less sagging and splashing. HEC has excellent color development. It has excellent compatibility with most colorants and connecting materials, making the preparation of latex paint have excellent color consistency and stability. The universality of its application in the formula is that it is a non-ionic ether. Therefore, it can be used in a wide pH range (2-12) and can be mixed with components in general latex paints such as reactive pigments, additives, soluble salts, or electrolytes.

There is no adverse effect on the coating, as HEC aqueous solution has obvious water surface tension characteristics, making it less prone to foaming during production and construction, and has less tendency towards volcanic and pinholes

Good storage stability. During long-term storage, it can maintain the dispersibility and suspension of pigments, without the problem of floating color and blooming. When there is little water layer on the surface of the paint and there is a significant change in storage temperature, its viscosity remains relatively stable

HEC can increase the PVC value (pigment volume concentration) by up to 50-60% in solid composition. In addition, the thickening agent for the surface coating of water-based coatings can also be HEC