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

A technology of nano-silica and enhanced compounding, which is applied in the direction of water repellent addition, coating, paper coating, etc., can solve the problems of high cost, limited application, high production cost of chitosan, etc., to achieve enhanced compounding effect, reduce Production cost, effect of reducing paper surface energy

Inactive Publication Date: 2018-05-04
ANHUI HONGSHI OPTOELECTRONICS HIGH TECH CO LTD
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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

Method used

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Embodiment Construction

[0016] A preparation method of nano silicon dioxide oleophobic reinforced composite chitosan sizing agent, comprising the following specific steps:

[0017] (1) Mix chitosan and glycidyltrimethylammonium chloride according to the molar ratio of 1:4, then disperse in 2 times the total amount of isopropanol, heat to 80°C, stir and react for 6 hours, stop the reaction Filter, dissolve the filter cake in 2 times the amount of deionized water, wash twice with absolute ethanol, filter, put the filter cake in a vacuum drying oven and dry at 70°C to obtain modified chitosan;

[0018] (2) Add an appropriate amount of cationic starch to 9 times the amount of deionized water, heat up to 95°C for heating in a water bath, and continue stirring at a speed of 500 rpm for 30 minutes to obtain a starch gelatinization solution; dissolve an appropriate amount of modified chitosan In an appropriate amount of deionized water, the control concentration is 3wt%, and the speed of 600 rpm is stirred f...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16D21H19/40D21H19/54D21H19/44C08B37/08
CPCC08B37/003D21H19/40D21H19/44D21H19/54D21H21/16
Inventor 徐道际张建波张成文邓书醒肖杰
Owner ANHUI HONGSHI OPTOELECTRONICS HIGH TECH CO LTD
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