Cation surface sizing agent emulsion

Abstract

The invention relates to a cationic surface sizing agent emulsion, which comprises the following compositions by mass: mixture A which is obtained by mixture of 100 parts of polymer colloid stabilizer, 100 to 900 parts of water and 1 to 100 parts of cationic etherifying agent; a modified polymer colloid stabilizer B which is obtained by addition of alkali for adjusting the pH value to between 7 and 14 and then addition of acid for adjusting the pH value to between 1 and 6; and a solution E which is obtained by mixture of 100 parts of the modified polymer colloid stabilizer B and 80 to 5,000 parts of water. The cationic surface sizing agent emulsion also contains the following compositions: a solution C which is obtained by mixture of 1 part of vinyl monomer and 0.01 to 1 part of self-crosslinking monomer; an initiator water solution D which is obtained by mixture of 1 part of water and 0.002 to 1 part of water-soluble initiator; and 0.01 to 1 part of cationic monomer. The cationic surface sizing agent emulsion solves the problem in the prior art that the surface strength, the folding resistance and the solvent resistance of polymers can not be simultaneously considered so as to make the application range of secondary fibers be limited. The cationic surface sizing agent emulsion can completely eliminate unfavorable influence of a micromolecular emulsifier and an organic solvent on the application performance of products and the environmental protection, and selection of raw materials is flexible and convenient.

Description

technical field [0001] The invention relates to a polymer surface sizing agent, in particular to a cationic surface sizing agent emulsion. Background technique [0002] At present, polymer surface sizing agents mainly include styrene-maleic anhydride copolymer (SMA), styrene-acrylic acid copolymer aqueous solution (SAA), styrene-acrylate emulsion copolymer (SAE), water-based polyurethane latex (PUD ) and so on. The polymer surface sizing agent requires organic solvents or surfactants during the preparation process, and has high foaming properties. For example, styrene-maleic anhydride copolymer and styrene-acrylic acid copolymer aqueous solutions are prepared by organic solvent polymerization, which will cause certain pollution to the manufacturing environment and application environment, and affect the operation and the health of users. Existing polymer surface sizing agents cannot balance the surface strength, folding resistance and solvent resistance of paper products. ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a cationic surface sizing agent emulsion, which solves the problem that conventional polymer surface sizing agents cannot take into account surface strength, folding resistance and solvent resistance, and suppresses surface sizing from completely replacing slurry internal sizing. Technical issues that limit the application range of secondary fibers

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