Preparation method of nano silicon dioxide oleophobic reinforced composite chitosan sizing agent

Abstract

The invention discloses a preparation method of a nano silicon dioxide oleophobic reinforced composite chitosan sizing agent. The preparation method comprises the following steps: firstly performing cationic modification for chitosan by virtue of glycidyl trimethyl ammonium chloride, so that the surface has cations, not only can a compounding effect with cationic starch be improved, but also the action on fibers and filler with the surface having negative charges is higher under the synergistic effect, and the retention assistant effect is excellent; and by gluing paper, the surface energy ofthe paper can be reduced, and a given electrostatic adsorption effect for oil drops can be realized; and the added nano silicon dioxide can be reasonably combined with chitosan, when the surface of the paper contacts oily ingredients, a layer of oil drop repelling phase can be formed on the surface of a micro-nano coarse structure, an effect for supporting the oil drops and preventing the oil drops from penetrating into the surface micro structure of solids can be realized, and the barrier performance for the oil can be further improved.

Description

technical field [0001] The invention relates to the technical field of papermaking sizing agents, in particular to a preparation method of a nano-silica oleophobic reinforced composite chitosan sizing agent. Background technique [0002] Paper packaging materials have the advantages of a wide range of sources, environmental protection, low cost of use, and easy processing, and are very suitable for use as packaging materials for food. Paper is mainly composed of cellulose. When it is directly used for food packaging, its anti-grease performance is poor. After vacuum aluminizing, film coating or coating with fluoropolymer on the surface of the paper base, the anti-grease performance of paper can be significantly improved, but the above-mentioned The packaging materials produced by the technology are poor in environmental protection and are difficult to be recycled. In developed countries such as the European Union, the production and use of such packaging materials have been ...

AI Technical Summary

Problems solved by technology

Compared with other natural organic substances such as starch, the production cost of chitosan is relatively high

Since the relative molecular mass of chitosan is generally 200,000 to 600,000, only when the coating amount is relatively high can the oil resistance and barrier properties of paper meet the requirements for use. Therefore, when chitosan is directly used as a paper surface sizing agent , the cost is too high, which limits its application in food packaging materials