Cationic styrene-acrylate surface sizing agent and preparation method thereof

Abstract

The invention discloses a cationic styrene-acrylate surface sizing agent and a preparation method thereof. The cationic styrene-acrylate surface sizing agent has a molecular structure shown in the specifications. The cationic styrene-acrylate surface sizing agent is prepared by performing soap-free emulsion polymerization reaction on polyvinyl alcohol 1788 serving as a dispersing agent, ammonium persulfate serving as an initiator, and styrene, methyl methacrylate, octadecyl acrylate, allyl alcohol and methacrylatoethyl trimethyl ammonium chloride serving as a mixed monomer. The prepared cationic styrene-acrylate surface sizing agent can form a strong ionic bond with electronegative paper fiber so as to improve the adhesion of the cationic styrene-acrylate surface sizing agent and corrugated base paper fiber and improve the ring crush strength of corrugated base paper; and simultaneously, the sizing agent forms a film layer on the surface of the corrugated base paper so as to improve the water resistance of the corrugated base paper.

Description

technical field The invention relates to the field of preparation of corrugated base paper surface sizing agents, in particular to a cationic styrene acrylate surface sizing agent and a preparation method thereof. Background technique With the rapid growth of my country's commodity export volume, the quality requirements for commodity packaging paper continue to increase, which puts forward higher requirements for my country's corrugated base paper manufacturers. Fresh fruits, food, vegetables, flowers and other agricultural products that are widely packaged and transported in corrugated cartons need to be sold by sea. It takes a long time for export commodities to be transported by sea. Due to the high humidity of the sea air, it is easy to cause the packaging cartons to absorb moisture and deform. In severe cases, the packaged commodities will be damaged and cause economic losses. At the same time, container technology is used in modern transportation, which requires frei...

AI Technical Summary

Problems solved by technology

Oxidized starch can improve the ring compressive strength and stiffness of corrugated base paper, but it is easy to absorb moisture after film formation, which affects water resistance and ring compressive strength

The AKD surface sizing agent has good water resistance, but its affinity with fibers is poor, and its contribution to ring pressure and stiffness is not large. The emulsion is easily hydrolyzed during storage and affects the sizing effect, and there are The problem in the curing period is that it takes a certain period of time after the paper is off the machine to reach the maximum sizing degree. During the curing period, due to the absorption of water, the ring compressive strength decreases greatly, and at the same time, the water resistance also decreases. Ordinary styrene-acrylic emulsion It is prepared by emulsion polymerization of styrene and acrylate monomers. Small molecule emulsifiers are often used in the preparation process, which not only affects the water resistance of corrugated base paper but also causes environmental pollution. Currently, most styrene acrylate surface sizing agents are used. It is an aqueous solution-based anionic polymer. During use, the water contains Al3+, Ca2+, etc., which will cause emulsion precipitation and have an adverse effect on sizing.

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