Method for improving water separation of emulsion paint and emulsion paint prepared by method

Abstract

The invention discloses a method for improving water separation of an emulsion paint and the emulsion paint prepared by the method. The method comprises the following steps of: adding sepiolite in an amount which is 0.1 to 1 percent based on the mass of the emulsion paint in the process of preparing the emulsion paint, and uniformly dispersing the sepiolite in the emulsion paint. The water separation problem of the emulsion paint is effectively improved, and the viscosity and leveling property of the emulsion paint product are hardly influenced; meanwhile, the adding amount of the sepiolite is small and the adding mode is simple.

Description

technical field [0001] The invention relates to a method for improving water separation of latex paint, in particular to a method for improving water separation of latex paint by using sepiolite, and the latex paint obtained by the method. Background technique [0002] Latex paint, also known as synthetic resin emulsion paint, is a kind of organic paint. It is a kind of water-dispersible paint prepared by adding pigments, fillers and various additives with synthetic resin emulsion as the base material. [0003] At present, the following methods are mainly used to solve the water separation problem of latex paint: choose a suitable thickener (organic thickener: cellulose and its derivatives, alkali swelling thickener, polyurethane thickener; inorganic thickener: bentonite, attapulgite, fumed silica), but choosing to add a suitable thickener has the following problems in formula design: first, the thickening mechanisms of various thickeners are different, and any type of thick...

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Problems solved by technology

[0003] At present, the following methods are mainly used to solve the water separation problem of latex paint: choose a suitable thickener (organic thickener: cellulose and its derivatives, alkali swelling thickener, polyurethane thickener; inorganic thickener: bentonite, attapulgite, fumed silica), but choosing to add a suitable thickener has the following problems in formula design: first, the thickening mechanisms of various thickeners are different, and any type of thickener has its own advantages and disadvantages. Features, in the thickening system of paint, if only one type of thickener is used, it is difficult to achieve long-term storage stability, good construction effect and ideal appearance of the coating film; usually, in the thickening system of paint, it is necessary to use Two types of thickeners can achieve better results

Therefore, it is more complicated to improve the water separation performance of latex paint by adjusting the thickener, which not only affects the leveling performance of the product, but also affects the construction performance of the product. It takes a lot of experiments to achieve a balanced effect.

[0004] Use inorganic thickeners such as bentonite, attapulgite, and fumed silica to improve the water separation problem of latex paint. The inorganic thickener has good biodegradation resistance and good low-shear thickening effect, but when roller coating, Poor splash resistance; and these three inorganic thickeners have different degrees of thickening effects on the system, and the dosage should be confirmed according to different formulas. At the same time, due to the strong thixotropy of the three-dimensional network structure, the product will be leveled during construction. Poor performance, similar to the leveling effect of adding cellulose, due to the difference in surface tension between the product and water, directly adding to water will form a lump that is difficult to disperse, so it must be pre-dissolved with an alcohol solvent before adding, production operation Trouble, using the above three inorganic thickeners to improve the water separation problem of the product is difficult to achieve the desired performance and use effect in formula design

[0005] Choose fillers with large oil absorption to improve water separation. Adding fillers with large oil absorption to the formula can partially improve the water separation problem of the product, but this type of filler must be added in a large amount to have a significant effect on preventing water separation. The addition of similar fillers will reduce the film-forming performance and make the product leveling and construction performance worse

[0006] In summary, the above methods have the following common technical defects: the formula design is difficult, and after the formula water distribution problem is solved, the product construction leveling property will be poor and the ideal coating effect cannot be obtained; the method has poor versatility and must be carried out according to the requirements of each formula design. Recipe Adjustment

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