Preparing method for paint rheolytic moisture holding regulator

Abstract

The invention belongs to the field of papermaking additives and relates to a regulator, in particular to a preparing method for a paint rheolytic moisture holding regulator.According to the rheolytic moisture holding regulator related in the method, hydrophobic groups are introduced on molecules of a common polymer and are associated, and meanwhile the hydrophobic groups can also adsorb emulsion particles and pigment particles.A net structure formed by associating the molecules is firm, and good paint thickening and moisture holding performance is achieved.

Description

technical field [0001] The invention belongs to the field of papermaking auxiliary agents, relates to regulators, in particular to a preparation method of a coating rheology water retention regulator. Background technique [0002] Water retention is an important basic property of coatings, which has an important impact on coating running performance. For coatings with poor water retention, the moisture in the coating transfers too quickly to the base paper. Under the action of pressure, the moisture is easily released from the coating, which causes the coated filter cake to thicken and solidify quickly before entering the scraper nip. As a result, serious scratches appear; the adhesive in the coating also migrates into the base paper with the absorption of water, thereby reducing the surface strength of the coating, resulting in powder falling and delamination of the coated paper during printing. This problem is aggravated when the base paper has high absorbency and air per...

AI Technical Summary

Problems solved by technology

[0005] 1. There is also an interaction between CMC and styrene-butadiene latex, which can easily lead to flocculation and reduce the stability of the latex;

[0006] 2. The water retention performance of CMC is extremely sensitive to the ambient temperature, and the water retention performance of coatings containing CMC decreases rapidly with the rise of temperature, which is not conducive to the stability of coating operation;

[0007] 3. As a water-retaining agent, CMC has limited improvement on the water-retaining performance of coatings;

[0008] 4. CMC does not precipitate when it encounters Ca salt, but it will cause the paint to reduce viscosity, and it will precipitate when it encounters heavy metal salts such as aluminum, iron, and silver;

[0009] 5. The viscosity of CMC is very high, and the thickening effect on the paint is also obvious, and the operating viscosity of the paint is not easy to control;

[0011] Therefore, a new paper coating thickening rheological water retention system came into being to meet the requirements of the development of coating technology, but the performance of some existing water retention modifiers is not so ideal, the key lies in its production method

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