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Starch gum and preparation method and application thereof

A starch glue, starch technology, applied in the direction of starch derivative coatings, starch derivative adhesives, adhesives, etc.

Inactive Publication Date: 2013-07-31
SOUTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, it has been confirmed that starch has been used as a base material after oxidation and acetate treatment, but there are few coatings based on oxidized acetate starch as starch glue.

Method used

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  • Starch gum and preparation method and application thereof
  • Starch gum and preparation method and application thereof

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preparation example Construction

[0024] The preparation of oxidized acetate starch in the present embodiment is specifically divided into two steps:

[0025] The first step, the preparation of oxidized starch: take a single variety of sweet potato starch, tapioca starch, and potato starch, or mix starch raw materials, and prepare starch milk. The mass percentage of starch milk is preferably 30-40%; then use alkaline pH The regulator adjusts the starch milk to be neutral, or neutral to alkaline, and the alkaline pH regulator can be sodium hydroxide; add sodium hypochlorite solution to the starch milk after pH adjustment, and maintain the reaction solution by adding an alkaline pH regulator The pH value in the medium is relatively stable; the temperature of the reaction system is maintained within the range of 30-40 degrees. After the reaction is completed, the reaction solution is adjusted to slightly acidic with an acidic pH regulator, such as pH 6.5, and the acidic pH regulator can be hydrochloric acid....

Embodiment 1

[0029] The preparation of embodiment one starch glue

[0030] Weigh 300g of oxidized acetate starch (the degree of oxidation is 0.2% based on the carboxyl content, and the degree of substitution is 0.02), put it into a container, add 1000 mL of water, stir and heat to 50°C to make a uniform starch emulsion, under stirring Add 140mL of NaOH solution with a mass fraction concentration of 15% and stir evenly, and keep the pH at 11, then slowly add 100mL of borax solution with a concentration of 4% (mass fraction) into the reactant under stirring, and then stir for 10 minutes after the addition. Then add 60 mL of completely dissolved 2% (mass fraction) carboxymethylcellulose sodium (CMC-Na) aqueous solution to the reactant under stirring, stir well after the addition, and cool to obtain starch glue.

Embodiment 2

[0031] The preparation of embodiment two starch glue

[0032] Weigh 50g of oxidized acetate starch (the degree of oxidation is 0.5% based on the carboxyl content, and the degree of substitution is 0.07), put it into a container, add 1000 mL of water, stir and heat to 50°C to make a uniform starch emulsion, under stirring Add 100mL of NaOH solution with a concentration of 20% in mass fraction and stir well, and keep the pH at 9, then slowly add 200mL of borax solution with a concentration of 4% (mass fraction) into the reactant under stirring, and then stir for 10 minutes after the addition is complete. Then add 150mL of completely dissolved 2% (mass fraction) carboxymethyl cellulose sodium (CMC-Na) aqueous solution to the reactant under stirring, fully stir evenly after the addition, and cool to obtain the starch glue product.

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Abstract

The invention relates to starch gum and an application thereof to an environmentally-friendly inner wall coating. A formula of the starch gum consists of the following components in parts by volume: 100 parts of an acetate oxide starch emulsion, 10-20 parts of a borax solution and 6-15 parts of a carboxymethylcellulose sodium solution, wherein the mass fraction of the carboxymethylcellulose sodium solution is 1-5 percent. A method for preparing the starch gum comprises the following steps of: preparing an alkaline acetate oxide starch emulsion; and preparing starch gum. The inner wall coatingis safe and nontoxic to the environment, and the viscosity and stability of the starch gum reach national standards; and the viscosity, fineness, coating appearance, adhesion, water resistance, waterdrying resistance and scouring resistance of the inner wall coating prepared from the starch gum are consistent with or higher than national standards.

Description

technical field [0001] The invention relates to an interior wall coating starch glue prepared by using compound modified starch as a raw material and its application in environment-friendly interior wall coatings. Background technique [0002] With the improvement of people's living standards, the enhancement of health awareness and environmental protection awareness, and the continuous occurrence of serious harm to human health due to interior decoration pollution, the society's demand for environmentally friendly and healthy interior decoration materials is increasing. Therefore, the development of environmentally friendly and healthy interior wall coatings has attracted the attention of many researchers. Since the gum base of the interior wall coating is the primary factor affecting the performance of the coating (such as: flexibility, water resistance, scrub resistance, weather resistance, stain resistance, etc.), the key to the study of the interior wall coating lies in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J103/10C09J101/26C09J11/04C09D103/10C09D7/12
Inventor 刘雄陈厚荣阚建全谭属琼
Owner SOUTHWEST UNIV