Synergistic and stable ASA sizing agent emulsion stabilized by cooperation of hectorite and polyvinylpyrrolidone

Abstract

The invention relates to an ASA sizing agent emulsion stabilized by cooperation of hectorite and polyvinylpyrrolidone, belonging to the technical field of emulsification of sizing agents for papermaking. On one hand, polyvinylpyrrolidone can initiate weak flocculation of hectorite, so that the hydrophilcity of hectorite particles is reduced, the affinity of ASA is improved, hectorite is promoted to be adsorbed to an ASA-water interface, and continuous granular membranes are formed at the peripheries of the ASA oil drops; on the other hand, polyvinylpyrrolidone can be directly adsorbed to the ASA-water interface and is arranged on the surfaces of the hectorite particle layer and the ASA oil drops in a coating manner to form a stable mechanical barrier, so that the ASA is effectively prevented from bleeding out of the coating layer, and the hydrolysis of ASA is prevented. Moreover, the mechanical barrier can be tightly combined with water, and aggregation among ASA droplets can be effectively avoided. Therefore, the stability of the ASA sizing agent stabilized by the cooperation of hectorite and polyvinylpyrrolidone is obviously improved.

Description

technical field [0001] The invention relates to an ASA sizing agent emulsion which is synergistically stabilized by hectorite and polyvinylpyrrolidone, and belongs to the technical field of papermaking sizing agent emulsification. Background technique [0002] ASA is the abbreviation of alkenyl succinic anhydride (alkenyl succinic anhydride), which is usually obtained by the addition reaction of isomerized long-chain internal olefins and maleic anhydride. It is a medium-alkaline reactive sizing agent commonly used in the paper industry. To improve the water resistance of paper and board. At room temperature, ASA is an oily liquid and insoluble in water. It must be emulsified into an oil-in-water emulsion before it can be used in papermaking systems. However, as an acid anhydride, ASA is easily hydrolyzed, and its hydrolyzed products not only reduce the sizing efficiency of ASA, but also react with metal ions such as calcium and magnesium to form sticky deposits, which serio...

AI Technical Summary

Problems solved by technology

Chinese patent CN101574834 discloses a method for stabilizing ASA emulsion by using montmorillonite / chitosan / ammonia water. The obtained emulsion droplet diameter is small and the sizing efficiency is high. efficiency is severely reduced

Chinese patent CN102493273A discloses an ASA emulsion stabilized by the combination of polyaluminum sulfate and hectorite. The ASA emulsion has good hydrolytic stability and sizing effect, but polyaluminum sulfate needs to be synthesized on site, so that the on-site preparation technology of ASA emulsion is still more complicated

In addition, the prior art also discloses a method for stabilizing the ASA sizing agent emulsion by using n-butylamine, alanine, urea, melamine, and quaternary ammonium salt modified hectorite. Hectorite can effectively improve the stability of ASA emulsion, such as melamine-modified hectorite and quaternary ammonium salt-modified hectorite can make ASA emulsion anhydrous phase precipitate after standing for 24 hours; however, n-butylamine, alanine The sizing performance of the ASA emulsion stabilized by acid and quaternary ammonium salt modified hectorite is still significantly reduced with the prolongation of the standing time, and the emulsion will have water phase precipitation due to hydrolysis after standing for 36 hours; and urea as a small molecule When amide is used to modify laponite, it has the disadvantage of adding a large amount