Reactive emulsifier phenylpropyl surface sizing agent and preparation method thereof

Abstract

The invention discloses a reactive emulsifier phenylpropyl surface sizing agent and a preparation method thereof. The reactive emulsifier phenylpropyl surface sizing agent has a molecular structure that the reactive emulsifier phenylpropyl surface sizing agent is prepared by using a method comprising the following steps of: preparing maleic acid polyethyleneglycol mono-stearate ester through the reaction of polyethyleneglycol, stearic acid and maleic anhydride, and preparing the reactive emulsifier phenylpropyl surface sizing agent through the copolymerization of the maleic acid polyethyleneglycol mono-stearate ester with styrene, octadecyl acrylate, acrylic acid and methyl acrylate by using ammonium sulfate as an evocating agent. The prepared reactive emulsifier phenylpropyl surface sizing agent can be well combined with paper fibers, the film forming property is good, and the water resistance and the ring crush compression resistance of semi-chemical corrugated paper can be improved.

Description

technical field The invention relates to the field of preparation of corrugated base paper surface sizing agents, in particular to a reactive emulsifier styrene-acrylic 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 boxes 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 requi...

AI Technical Summary

Problems solved by technology

However, the corrugated base paper produced with domestic waste paper as raw material has a rough appearance. In practical applications, most of the corrugated paper shows low strength, especially the ring pressure index cannot meet the needs of users, which reduces the grade of cardboard, and the product sales are not smooth. Market competitiveness Poor, resulting in the overproduction of low-strength corrugated paper and the market structure of high-strength corrugated paper in short supply. More and more corrugated base paper companies have begun to use surface sizing to achieve the purpose of endowing paper with water resistance and improving ring pressure. The surface sizing agents currently used for corrugated base paper are oxidized starch, alkyl ketene dimer (AKD) and ordinary styrene-acrylic emulsion.

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

AKD surface sizing agents have good water resistance, but they have poor affinity with fibers and do not contribute much to ring pressure and stiffness. The emulsion is easily hydrolyzed during storage and affects the sizing effect, and there are The problem in the curing period, that is, 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 emulsions are 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.

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