Preparation of cation polymer emulsifier for AKD

Abstract

The invention discloses a method for preparing AKD cationic macromolecular emulsifier, comprising the following steps: adequate acrylic acid long-chain fatty esters and adequate vinyl monomers such as cationic monomers and so on are selected according to the physicochemical properties of binding compositions; free-radical nonsoap latex copolymerization is performed in water solution by adoption of the seeding polymerization method under the condition that modified polyvinyl alcohol exists; and the AKD cationic macromolecular emulsifier is obtained. The AKD cationic macromolecular emulsifier can replace micromolecular emulsifier added into the prior AKD latex; the problems of easy foaming of the latex, poor stability and sizing effect and so on are solved; simultaneously the adhesion property and the anionic waste interference resistance of the emulsifier are greatly improved; not only the waterproofness of paper can be improved but also the physical strength of the paper can be improved; and no cationic starch is required to be added for colloid protectant during the preparing process of the emulsifier, thereby overcoming the defect of poor sizing effect and stability of the AKD latex due to easy deterioration of the emulsifier during the high-temperature and long-term storage process.

Description

technical field [0001] The invention belongs to the field of polymer chemistry, in particular to a preparation method of a cationic AKD polymer emulsifier. Background technique [0002] The application of neutral sizing in domestic and foreign papermaking enterprises has become more and more extensive. Compared with acid sizing, its advantages are becoming more and more obvious in terms of improving product quality, reducing overall cost, and favoring the market and users. Practice has proved that AKD has become the most mature and effective neutral sizing agent used by domestic paper mills. Due to the characteristics of AKD's high activity and easy hydrolysis, the formulation of its emulsion should not only solve the problem of emulsification, but also solve the problem of its stability. At present, AKD commonly used emulsifiers include natural polymers and surfactants such as sodium lignosulfonate and cationic starch. Surfactants mainly include higher fatty acids, higher...

AI Technical Summary

Problems solved by technology

The emulsion prepared by the above-mentioned surfactants has many foams and poor stability. Due to the large amount of cationic starch used, problems such as mold and deterioration are prone to occur at high temperatures.

Moreover, the retention rate of the prepared AKD emulsion on the fiber and its reactivity with the fiber are low, so the sizing effect is prone to decline, and the strength performance of the paper is reduced after sizing