Method for preparing high molecule emulsifying agent for ASA

Abstract

The invention discloses a preparation method for a macromolecule emulsifier used in ASA. The invention solves the problem that cationic starch and a micromolecule emulsifier added in the traditional ASA latex have poor gluing effect, and the prepared latex easily forms bubbles and has poor stability. The method chooses appropriate oil-soluble vinyl monomers, water-soluble vinyl monomers and cation monomers under the action of a macromolecule stabilizing colloid; the macromolecule emulsifier used in ASA is prepared under the action of an evocating agent by seed emulsion polymerization. On one hand, the macromolecule emulsifier can overcome the shortcoming that the cationic starch easily goes bad at high temperature and in the process of the long term storage to cause that the ASA latex has poor gluing effect and poor stability; on the other hand, the reserving performance and the anti-anion trash interference performance of the macromolecule emulsifier are greatly increased; the macromolecule emulsifier not only can increase water resistance of paper but also can increase the physical strength of paper; in addition, when the macromolecule emulsifier is used for ASA emulsification, additional pasting, dilution and high shear emulsifying plants are not needed.

Description

technical field [0001] The invention belongs to the field of polymer chemistry, in particular to a preparation method of a polymer emulsifier for ASA. Background technique [0002] In recent years, with the continuous increase in the demand for medium and alkaline paper, papermaking enterprises at home and abroad have basically completed the transformation from acidic papermaking to neutral papermaking, and neutral sizing agents have been promoted and accepted in many large and medium-sized papermaking factories application. Alkenyl succinic anhydride (ASA), as a medium / alkaline sizing agent, has been widely used in paper mills. Currently commonly used ASA emulsifiers are cationic starch, cationic polyacrylamide and surfactants or a mixture of two or more. When cationic starch and cationic polyacrylamide are used as ASA emulsifiers, paper mills need to configure additional gelatinization, dilution and high-shear emulsification equipment, and the emulsion is easily broken a...

AI Technical Summary

Problems solved by technology

When cationic starch and cationic polyacrylamide are used as ASA emulsifiers, paper mills need to configure additional gelatinization, dilution and high-shear emulsification equipment, and the emulsion is easily broken and loses activity after high-shear, and the sizing degree is slow Lag, it can be measured after a period of time after the paper is off the machine, and the paper will slip when re-sizing; in order to improve the emulsifying ability of ASA and enhance the stability of ASA emulsion, it is often necessary to add an appropriate amount of traditional small molecule emulsifier agent, which will also have a certain adverse effect on the sizing effect