Cationic styrene-acrylic emulsion, preparation method and application thereof

Abstract

The invention discloses a cationic styrene-acrylic emulsion, and a preparation method and application of the cationic styrene-acrylic emulsion, wherein the preparation method comprises the steps of a) mixing methacrylate, methyl styrene and methacrylic acid to obtain a mixed monomer a; b) mixing an emulsifier, an initiator and water to obtain an emulsifier and initiator aqueous solution b; c) mixing a cationic monomer and water to obtain a cationic monomer aqueous solution c; d) adding the mixed monomer a to the emulsifier, the initiator and water and mixing to obtain a mixed monomer solution d; e) adding the mixed monomer a to the emulsifier, the initiator and water, allowing reaction, and then dropwise adding the mixed monomer solution d, the emulsifier and initiator aqueous solution b and the cationic monomer aqueous solution c, performing reaction; then using alkaline solution to neutralize the mixture till that pH is 7-10, and finally obtaining the product. The invention improves adsorption and retention of the emulsion on the fibers of paper surface, remarkably strengthens surface strength of the paper and notably reduces Cobb value of the coated duplex board with grey back.

Description

technical field [0001] The invention relates to a cationic styrene-acrylic emulsion applied to the surface sizing of gray-bottomed white board paper. Background technique [0002] Emulsions are widely used for paper surface sizing, and the performance requirements of emulsions are getting higher and higher during the application process. With the improvement and development of emulsion application technology, the emulsion is required to have good process applicability, among which the most important thing is the cohesiveness of styrene-acrylic emulsion. The application of emulsion in paper coating can significantly improve the surface strength of paper and significantly reduce the C0bb value of gray-bottomed white board paper. [0003] With the gradual increase of the proportion of secondary fibers in the raw materials for pulping and papermaking, and the increasing sealing degree of the white water cycle of the paper machine, the papermaking environment in the wet end is b...

AI Technical Summary

Problems solved by technology

[0003] With the gradual increase of the proportion of secondary fibers in the raw materials for pulping and papermaking, and the increasing sealing degree of the white water cycle of the paper machine, the papermaking environment in the wet end is becoming increasingly harsh, and cationic surface sizing agents are increasingly favored by people. Currently, factories use weak Anionic styrene-acrylic surface sizing agent is a surface sizing agent specially designed to improve water resistance. During use, aluminum sulfate needs to be added to increase the retention rate of the surface sizing agent, and the operation is troublesome.

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