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Production technology for succinate coating starch used in papermaking

A technology of coating starch and production process, which is applied in papermaking, paper coating, textiles and papermaking, etc., to achieve good paste liquid transparency, enhance surface strength, and improve quality

Inactive Publication Date: 2009-05-13
诸城兴贸玉米开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a production method of succinate coated starch for papermaking with low gelatinization temperature, good film-forming property and water retention in view of the disadvantages existing in the production of succinate-coated starch for papermaking. craft

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 500kg of absolute dry cornstarch is added in the reaction vessel, and the reaction vessel is generally a reaction tank, (the absolute dry cornstarch is the quality of converting the moisture-containing cornstarch into moisture-free starch, the same below), in the reaction Prepare 1315kg of starch milk from cornstarch and water in a container, then raise the temperature to 34-36°C, add sodium hydroxide solution with a mass concentration of 2.8-3.2%, and adjust the pH value of the starch milk to 9.3-9.6. Adding mass concentration to starch milk then is 114kg of sodium hypochlorite of 11% to carry out oxidation reaction 3 hours, keep above-mentioned pH value and reaction temperature in the reaction process. After the oxidation reaction is finished, add a small amount of sodium metabisulfite to reduce the unreacted sodium hypochlorite, then adjust the pH value of the starch milk to 8.8-9.2 with a sodium hydroxide solution with a mass concentration of 2.8-3.2%, and slowly add...

Embodiment 2

[0017] Add 500kg of absolute dry cornstarch into the reaction vessel, mix cornstarch and water into 1250kg of starch milk in the reaction vessel, then raise the temperature to between 34-36°C, add sodium hydroxide solution with a mass concentration of 3% to adjust the starch The pH of milk is between 9.3-9.6. Adding mass concentration to starch milk then is 136kg of sodium hypochlorite of 11% to carry out oxidation reaction 3.5 hours, keep above-mentioned pH value and reaction temperature in the reaction process. After the oxidation reaction is finished, add a small amount of sodium metabisulfite to reduce the unreacted sodium hypochlorite, then adjust the pH value of the starch milk to 8.8-9.2 with a sodium hydroxide solution with a mass concentration of 2.8-3.2%, and slowly add 25kg of succinic anhydride to carry out the esterification process. For the reaction, add succinic anhydride within two hours, and keep the pH value and the above temperature for 5 hours. After the es...

Embodiment 3

[0019] Add 500kg of absolute dry cornstarch into the reaction vessel, mix cornstarch and water into 1190kg of starch milk in the reaction vessel, then raise the temperature to between 34-36°C, add sodium hydroxide solution with a mass concentration of 3.2% to adjust the starch The pH of milk is between 9.3-9.6. Adding 159.1 kg of sodium hypochlorite with a mass concentration of 11% to the starch milk then carried out an oxidation reaction for 4 hours, and kept the above pH value and reaction temperature in the reaction process. After the oxidation reaction is finished, add a small amount of sodium metabisulfite to reduce the unreacted sodium hypochlorite, then adjust the pH value of the starch milk to 8.8-9.2 with a sodium hydroxide solution with a mass concentration of 2.8-3.2%, and slowly add 27.5kg of succinic anhydride to carry out For the esterification reaction, add succinic anhydride within two hours, and keep the pH value and the above temperature for 6 hours. After th...

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Abstract

The invention discloses a process for producing succinate coated starch in paper making. In the process, corn starch and water are mixed in a reaction vessel to obtain starch milk, heated up to the temperature of between 34 and 36 DEG C, and added with sodium hydroxide solution to adjust the pH value of the starch milk to between 9.3 and 9.6; the starch milk is added with sodium hypochlorite for oxidizing reaction; and in the reaction, the reaction temperature and the pH value are kept unchanged; the starch milk is added with sodium hydroxide solution again to adjust the pH value of the starch milk to between 8.8 and 9.2, and slowly added with succinate which accounts for 4.5 to 5.5 percent of the total weight of the absolute dry starch for esterification reaction; the pH value and the temperature are kept unchanged during reaction; after the esterification reaction, the starch milk is added with hydrochloric acid solution for neutralization until the pH value of the starch milk is between 5.8 and 6.2; and the neutralized starch milk is washed and dried to obtain the finished product. The product produced by the process has the advantages of low gelatinization temperature, good transparency of pasty liquid, film forming property and water retention property, higher stability, and good compatibility with other coatings.

Description

technical field [0001] The invention belongs to the technical field of starch processing, in particular to a production process of succinate-coated starch for papermaking. Background technique [0002] my country's current coated paper coated starch is basically oxidized starch or oxidized acetyl starch, and there are also some phosphate coated starches produced by dry method. Oxidized starch is simply oxidized and denatured by starch, the molecular chain becomes shorter and the viscosity is reduced, and the hydroxyl group is oxidized to carboxyl group. The product's hydrophilicity, film-forming property, compounding property with other coatings, water retention and stability are not ideal. , which affects the smoothness, surface strength and other properties of coated paper; and oxidized acetyl starch is easily hydrolyzed due to the poor stability of the acetyl group under alkaline and high temperature conditions, not only loses the effect of esterification, but also hydrol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H19/54
Inventor 邱立忠卞希良孙纯锐宋瑞江夏凤清
Owner 诸城兴贸玉米开发有限公司
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