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Preparation method and application of oxidized starch

A technology for oxidizing starch and starch, applied in the addition of water repellent, coating, paper coating, etc., can solve the problems of poor starch granule concentration, affecting product application, low degree of oxidation, etc., to improve smoothness and gloss, improve Bursting strength and folding strength, the effect of modified oil resistance

Inactive Publication Date: 2012-10-10
新乡市东升新材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the oxidized starch prepared by dry method still has common problems that the mixing of reaction reagents is not uniform enough, there is a concentration difference between starch granules, and the energy transfer in the medium is uneven, resulting in uneven oxidation of the product and a low degree of oxidation, which affects the application of the product.

Method used

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  • Preparation method and application of oxidized starch
  • Preparation method and application of oxidized starch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Add 300g of starch into the mixer, start stirring, spray 13g of sodium hydroxide solution with a weight concentration of 2% with a sprayer, and after stirring for 10 minutes, spray 7.7g of hydrogen peroxide with a weight concentration of 17%, and heat up to 50°C ;

[0029] (2) Stir once every 15 minutes within one hour, spray 7.7g of hydrogen peroxide with a weight concentration of 17% every 1 minute, and react for 4 hours at a temperature of 50°C;

[0030] (3) Cool to 25°C, spray into hydrochloric acid solution with a weight concentration of 10% to neutralize the pH of the system to 7.0, stir, pulverize, and pass through a 100-mesh sieve to obtain the product, using WS-SD d / O chroma white The whiteness of the oxidized starch is 92% by the degree meter, tested by the GB / T 20374-2006 standard, the carboxyl content is 0.35%, tested by the HG / T3933-2007 standard, the spots (pcs / cm2) = 0,6% The viscosity of the solution was 34 cps, which remained essentially unchanged ...

Embodiment 2

[0032] (1) Add 300g of starch into the mixer, start stirring, spray 26g of sodium hydroxide solution with a weight concentration of 2% with a sprayer, stir for 5 minutes, spray 5g of hydrogen peroxide with a weight concentration of 14%, and heat up to 50°C;

[0033] (2) Stir once every 15 minutes within one hour, spray 4.4g of 14% hydrogen peroxide for 2 minutes each time, and react for 6 hours at a temperature of 40°C;

[0034] (3) Cool to 25°C, spray 5g of hydrochloric acid solution with a weight concentration of 10%, the pH of the neutralization system is 6.8, stir, pulverize, and pass through a 100-mesh sieve to obtain the product.

[0035] The whiteness of oxidized starch is 94% by WS-SD d / O chromaticity and whiteness meter, the carboxyl content is 0.22% by GB / T 20374-2006 standard, and the test is by HG / T3933-2007 standard, the spot ( pieces / cm2)=0,6% solution has a viscosity of 42cps, basically unchanged within 24 hours.

Embodiment 3

[0037] (1) Add 300g of starch into the mixer, start stirring, spray 34.8g of 3% potassium hydroxide solution with a sprayer, stir for 8 minutes, spray 5.5g of 23% hydrogen peroxide, and heat up to 35°C;

[0038] (2) Stir once every 15 minutes within one hour, spray 11.7g of 23% hydrogen peroxide for 3 minutes each time, and react for 7 hours at a temperature of 35°C;

[0039] (3) Cool to 25°C, spray into 10% by weight hydrochloric acid solution to neutralize to pH 8.0, stir, pulverize, and pass through a 100-mesh sieve to obtain the product;

[0040] The whiteness of oxidized starch is 93% when tested by WS-SD d / O color and whiteness meter. It is tested by GB / T 20374-2006 standard. The carboxyl content is 0.41%. It is tested by HG / T3933-2007 standard. Spots (piece / cm2)=0,6% solution has a viscosity of 28cps, basically unchanged within 24 hours.

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Abstract

The invention provides oxidized starch, a preparation method thereof and application. The preparation method of the oxidized starch includes the steps: (1) under the condition of mixing, spraying catalyst solution into the starch, spraying oxidants and increasing the temperature to reach 30-50 DEG C; (2) after mixing the starch every 15 minutes within an hour, spraying residual oxidants to react for 4-8 hours; and (3) cooling the starch, adding neutralizers until the pH (potential of hydrogen) of a system is 6-8, crushing the starch, and screening the starch by a screen with 90-120 meshes to obtain the oxidized starch. The weight of the sprayed oxidants accounts for 30-60wt% of the overall weight of oxidants, catalysts are sodium hydroxide or potassium hydroxide, and the oxidants are hydrogen peroxide. The oxidized starch can be used for gluing the surface of paper, continuous and uniform films are formed on the surface of a paper sheet, oil resistance and scratch resistance of the paper sheet can be improved, and smoothness and glossiness of the paper sheet are improved. When the oxidized starch is used for internal sizing, paste can be uniformly and adsorbed on fibers, and the bursting strength and the folding resistance of the paper are improved.

Description

technical field [0001] The invention relates to a preparation method and application of oxidized starch. technical background [0002] Starch has wide sources, short maturity period, renewable and low price, and is environmentally friendly. As an industrial raw material that can partially replace petrochemical products, it shows broad development prospects in today's increasingly scarce petroleum resources. Oxidized starch is one of the main varieties of modified starch. Compared with natural starch, it has many advantages and has been widely used, especially oxidized starch instead of sodium polyphosphate as a detergent builder will solve the phenomenon of polyphosphate in water exceeding the normal production of water source fertilization, with broadly application foreground. [0003] However, starch has a crystalline granule structure, with a non-crystalline area inside and a crystalline area outside, which is very firm and has strong resistance to water and chemical so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/18D21H21/16D21H19/14D21H17/28
Inventor 施晓旦李改霞王养臣
Owner 新乡市东升新材料有限公司
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