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Surface sizing agent and preparation method thereof

A surface sizing agent, guar collagen technology, applied in the direction of adding water repellent, can solve the problems of production and environmental impact, slow reaction speed, reduce cationic starch, etc., achieve easy dispersion and use, increase affinity, and improve air permeability Effect

Active Publication Date: 2012-02-29
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its viscosity and stability, ordinary cationic starch cannot be directly used for surface sizing, and must be continuously modified to control its viscosity and ensure the stability of its gelatinized liquid.
To reduce the viscosity of cationic starch, the usual method is to oxidize the starch. At present, sodium hypochlorite is commonly used as an oxidizing agent, but the reaction speed of sodium hypochlorite is slow, which causes a large amount of soluble sugar substances to dissolve during the oxidation process, and produces chlorine-containing carcinogens. Great impact on both production and the environment

Method used

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  • Surface sizing agent and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0018] (1) Add 200 parts of ethanol to a four-necked flask equipped with stirring, thermometer, dripping pipeline and venting pipeline, blow nitrogen, add 200 parts of guar collagen powder under stirring, disperse at room temperature for 10 minutes, add dropwise Cationic etherification agent 3-chloro-2-hydroxypropyltrimethylammonium chloride 40 parts, the dropwise addition time is 15 minutes, after the dropwise addition, add sodium hydroxide solution, adjust the pH value of the solution to 11.0, heat up to 70°C, after two hours of reaction at this temperature, cationic guar gum is obtained, and the temperature of the system is lowered to 30°C;

[0019] (2) Use hydrochloric acid to adjust the pH value of the solution to 4.0, take 0.2 parts of peracetic acid and add it to the reaction kettle and mix it with cationic guar gum evenly, then heat up to 40°C and react for 2 hours;

[0020] (3) After the temperature of the above solution is lowered to 25°C, add 0.2 parts of viscosity ...

Embodiment 2

[0022] (1) Add 400 parts of ethanol to a four-necked flask equipped with stirring, thermometer, dripping pipeline and venting pipeline, pass nitrogen gas, add 200 parts of guar collagen powder under stirring, disperse at room temperature for 10 minutes, add dropwise Cationic etherification agent 3-chloro-2-hydroxypropyltrimethylammonium chloride 80 parts, dropwise time is 10 minutes, after the dropwise addition, add sodium hydroxide solution, adjust the pH value of the solution to 11.5, heat up to 60°C, after reacting at this temperature for three hours, cationic guar gum is obtained, and the system is cooled to 25°C;

[0023] (2) Use hydrochloric acid to adjust the pH value of the solution to 3.0, take 0.4 parts of peroxosulfuric acid and add it to the reaction kettle and mix it with cationic guar gum evenly, then heat up to 50°C and react for 1.5 hours;

[0024] (3) After reducing the temperature of the above solution to 25°C, add 0.4 parts of the viscosity stabilizer dicarb...

Embodiment 3

[0026] (1) Add 300 parts of ethanol to a four-necked flask equipped with stirring, thermometer, dripping pipeline and venting pipeline, pass nitrogen gas, add 200 parts of guar collagen powder under stirring, disperse at room temperature for 10 minutes, add dropwise 70 parts of cationic etherification agent 3-chloro-2-hydroxypropyltrimethylammonium chloride, the time of dropping is 15 minutes, after the dropwise addition is completed, adding a sodium hydroxide solution with a weight concentration of 30% to adjust the pH of the solution The value is 10.5, heat up to 55°C, and react at this temperature for 3.5 hours to obtain cationic guar gum, and cool the system to 30°C;

[0027] (2) Use hydrochloric acid to adjust the pH value of the solution to 4.0, take 2 parts of peracetic acid and add it to the reaction kettle and mix it with cationic guar gum evenly, then heat up to 70°C and react for 0.5 hours;

[0028] (3) After the temperature of the above solution is lowered to 25°C,...

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Abstract

The invention discloses a surface sizing agent and a preparation method thereof. The preparation method comprises the following steps: 1, adding an aqueous solution of a cationic etherifying agent to a mixture of guar gum raw powder and an aqueous solution of a low carbon alcohol under an inert atmosphere, such as a nitrogen atmosphere, adding an alkali catalyst, and reacting to obtain a cationic guar gum product; 2, adjusting the pH value of a system of the product obtained in step 1 to 1-4 by an acidic neutralizer, adding a superacidic chemical, and reacting; and 3, adding a viscosity stabilizing agent, and simultaneously adjusting the PH value to 6-9, reacting, and collecting the surface sizing agent from reaction products. The surface sizing agent of the invention, which has the characteristics of very good fluidity, easy dispersion and usage, exquisite and stable gum solution, and rapid hydration swelling, is an ideal surface sizing agent, and simultaneously is a multifunctional wet-end additive. The surface sizing agent is suitable for sizing various surfaces of cultural paper, newspaper, art paper and special paper.

Description

technical field [0001] The invention relates to a paper surface sizing agent and a preparation method thereof. technical background [0002] In order to endow the paper surface with good smoothness and strength, people often solve the problem by surface sizing and modifying starch. Usually, oxidized starch is used, but this starch has poor affinity with fibers. When broken paper is recycled, most of it enters white water. system, which increases the BOD and COD values ​​of the system, which is very harmful to environmental protection. At the same time, it affects the Zeta potential of the system, which in turn affects paper machine making, and the surface strength is not good. Because cationic starch has a strong adsorption effect on anionic fibers and fillers, it can It is well retained by fibers; and effectively reduces environmental pollution. Therefore, domestic and foreign are competing to study cationic starch suitable for paper surface sizing. However, due to its vi...

Claims

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Application Information

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IPC IPC(8): D21H21/16
Inventor 施晓旦李改霞王养臣
Owner SHANGHAI DONGSHENG NEW MATERIALS
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