Preparation process for oxidized cationic sizing starch

A technology for sizing starch and preparation process, which is applied in the directions of adding water repellents, paper, textiles and papermaking to achieve the effects of stable quality, reduced paper cost, and prevention of lint

Inactive Publication Date: 2014-04-02
江西红星变性淀粉有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] However, the oxidized cationic starch prepared by the vacuum dry method is still in the initial stage of research in my country, and no related products have been put on the market for the time being, especially in the domestic literature.

Method used

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  • Preparation process for oxidized cationic sizing starch
  • Preparation process for oxidized cationic sizing starch
  • Preparation process for oxidized cationic sizing starch

Examples

Experimental program
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Embodiment 1

[0026] (1) Oxidation reaction:

[0027] Get 1000 parts by weight of tapioca starch, put it into a dry reaction kettle and spray it into the starch with a volume concentration of 3-5% diluted lye, adjust the pH value to 9, then spray sodium hypochlorite, the amount of sodium hypochlorite is 5% of tapioca starch %, after fully stirring evenly, draw a vacuum, the vacuum degree is 300-500pa, heat to 60°C, and react for 2 hours.

[0028] (2), etherification complex reaction:

[0029] After the reaction of oxidized starch is finished, the vacuum of the dry process reactor is released, and the mixture of alkali and 3-chloro-2 hydroxypropyl trimethyl ammonium chloride is directly sprayed, and the substitution degree of oxidized cationic sizing starch is 0.01-0.02, The dosage of 3-chloro-2 hydroxypropyl trimethyl ammonium chloride is 3%-4% of tapioca starch, and the molar ratio of 3-chloro-2 hydroxypropyl trimethyl ammonium chloride and alkali is 1.5-1.7; After spraying the chemicals...

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Abstract

The invention discloses a preparation process for oxidized cationic sizing starch. The preparation process is characterized in that molecules of oxidized starch generate carbonyls after the tapioca starch is oxidized by an oxidizing agent, and in addition, dissociation-polymerization reaction is initiated; cationic starch is generated by performing etherification reaction on the oxidized starch and a quaternary ammonium salt cationic chemical reagent (3-chlorine-2-hydroxypropyl chlorine) under an alkaline condition; oxidized quaternary ammonium cationic starch is obtained by composite reaction, namely by combining starch oxidization reaction and etherification reaction; a vacuum pollution-free dry process is adopted for a production process; oxidized quaternary ammonium cationic starch, namely the oxidized cationic sizing starch, with different viscosity and substituted ratios can be synthesized by adjusting the ratio of the starch, the oxidizing agent and an etherification agent. The preparation process is free of wastewater emission and environment-friendly, the performance of a product and the quality of a paper product are stable, the sizing requirements of a high-speed paper machine can be met, imported surface sizing starch can completely be replaced, and the paper cost can be lowered.

Description

technical field [0001] The invention belongs to the field of fine chemicals, and relates to an oxidized cationic starch surface sizing agent for papermaking, in particular to a preparation process of oxidized cationic starch. Background technique [0002] With the development of high-grade and diversified paper products and the continuous increase in the speed of paper machines, higher and finer functional requirements are put forward for modified starch. Sizing starch is a variety with high quality requirements among paper-making modified starches. my country's research and development of new modified starches started later than foreign countries. Although there are many types of traditional sizing starches, there are many deficiencies in quality. For example, acid-modified and oxidized starch adopts wet acidification and oxidative denaturation, and the film-forming properties, fluidity, adhesion and stability of the products are not ideal, and affect the sizing operation, ...

Claims

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Application Information

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IPC IPC(8): D21H21/16D21H17/28
Inventor 温费申张鹏乐晓旺刘雷震金贞玉
Owner 江西红星变性淀粉有限公司
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