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Method of preparing cation painting and coating starch

A technology of coating starch and cations, applied in the direction of paper, textile and papermaking, non-fibrous pulp addition, etc., can solve the problems of large amount of synthetic latex, poor paper adaptability, reduce manufacturing cost, etc., achieve low peak viscosity, improve fluidity , the effect of reducing manufacturing costs

Active Publication Date: 2009-08-19
GUANGDONG HUIMEI STARCH SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to overcome the disadvantages of poor paper adaptability, easy lint and powder falling, large amount of synthetic latex, and high cost during the use of existing starch for coating, the invention provides a preparation method capable of producing cationic coating starch, using the method Produces products with high transparency and low viscosity peaks, reducing manufacturing costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add appropriate amount of water to 1 ton of natural starch to adjust the starch to 18°Bé starch slurry, and adjust the pH value to 6, then add a medium-temperature α-amylase with an active temperature of 30°C, heat the starch slurry to 35°C, and keep it warm for 40 Minutes, after detecting that the starch viscosity is reduced to 10mpa.s, add sodium carbonate terminator to it, adjust the pH value to 9, stop the degradation of amylase, then dehydrate and dry into a semi-finished product, then put the semi-finished product into the reaction tank, and add high Calcium hydroxide reaction catalyst with a purity of 0.5%. After stirring evenly, add 1.5% ammonium salt cationic etherification agent, raise the temperature of the reaction tank to 70°C, and react for 60 minutes. After reaching the required 0.02, the starch is transported to the mixing tank with air cooling, the temperature is lowered to 20°C, neutralized with 5°Bé hydrochloric acid to a pH value of 6, and finally dri...

Embodiment 2

[0031] Add appropriate amount of water to 1 ton of natural starch to adjust the starch to 22°Bé starch slurry, and adjust the pH value to 8, then add a medium-temperature α-amylase with an active temperature of 60°C, heat the starch slurry to 45°C, and keep it warm at 120°C Minutes, after detecting that the starch viscosity has decreased to 80mpa.s, add sodium hydroxide terminator to it, adjust the pH value to 11.5, stop the degradation of amylase, and then dehydrate and dry it into a semi-finished product, then put the semi-finished product into the reaction tank, and add High-purity 6% calcium hydroxide reaction catalyst, after stirring evenly, add 6.5% ammonium salt cationic etherification agent, raise the temperature of the reaction tank to 90°C, and react for 120 minutes. After the temperature reaches the required 0.035, the starch is transported to the mixing tank with air cooling, the temperature is lowered to 20°C, neutralized with 15°Bé hydrochloric acid to a pH value ...

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Abstract

The invention discloses a method for preparing cationic coating starch, which comprises the following steps: 1) pulping by starch; 2) decomposing the starch by enzyme; 3) dehydrating and drying the zymohydrolysis starch to prepare a semi-finished product; 4) modifying the semi-finished product by a cation dry method; 5) cooling the semi-finished product subjected to the modified treatment by the cation dry method to reduce temperature, and adjusting the pH value by acid; and 6) drying, crushing and sieving the treated semi-finished product to obtain a finished product. The obtained product has high transparency and low viscosity peak value, lowers the manufacturing cost, simultaneously improves the printing adaptability to paper, has clear printing handwriting, reduces lint and dust fall, greatly improves the liquidity at high solid amount (25 to 40 percent) during use, reduce the using amount of latex, and lowers the using cost.

Description

technical field [0001] The invention relates to a method for preparing cationic coating starch, in particular to a preparation process suitable for coating starch for papermaking. Background technique [0002] Cationic starch refers to the reaction of starch with amine compounds to generate enzyme derivatives containing amino and ammonium groups, because the ammonia atom has a positive charge on the modified starch. It can be divided into tertiary amine type, quaternary amine type, primary amine type cationic starch, dialdehyde cationic starch, compound cationic starch, amphoteric cationic starch, etc. Cationic starch is mainly used as a wet-end additive in the paper industry, and can be closely combined with mineral fillers and fibers to play the role of retention, drainage and reinforcement. Cationic starch can also be used for surface sizing, improve the surface strength and drying speed of paper, reduce lint and powder, and can also be used for coating adhesives and wat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H17/29
Inventor 喻永青
Owner GUANGDONG HUIMEI STARCH SCI & TECH
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