Corn starch adhesive for building and preparation method thereof

A technology of corn starch and adhesives, applied in the direction of starch-derived adhesives, adhesive types, etc., can solve the problems of poor water resistance and stability, dark color of starch adhesives, etc., to improve bonding ability, increase product viscosity, reduce The effect of manufacturing costs

Inactive Publication Date: 2012-03-28
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some researchers have made interior wall coatings from adhesives obtained by direct alkali gelatinization after cross-linking oxidized starch and formaldehyde, but the starch adhesives obtained by this method are darker in color and still contain a small amount of formaldehyde; Compound starch with polyvinyl alcohol to obtain interior wall paint. This method has stronger bonding ability than the starch glue prepared above, but its water resistance and stability are poor.

Method used

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  • Corn starch adhesive for building and preparation method thereof
  • Corn starch adhesive for building and preparation method thereof
  • Corn starch adhesive for building and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The cornstarch purchased in the market is used as raw material, and tap water is used as water source.

[0022] Put 30g of cornstarch and 70g of water into a three-neck round bottom flask, stir evenly, then heat up to 60°C, add 0.8ml of 30% hydrogen peroxide and 4ml of 0.1% copper sulfate, and oxidize for 1.5 hours.

[0023] After cooling the above oxidized solution, 10% sodium hydroxide solution was added to adjust the pH value to 9. Then add eg 2 g of acetic anhydride while maintaining the pH at 9 with 10% sodium hydroxide solution. The addition was completed in about 20 minutes, and then reacted for 40 minutes.

[0024] Add the above solution to sodium benzoate and adjust the pH value to 5 with 10% sodium bisulfite solution, add water to make the total amount reach 200g, and then gelatinize at 70°C to obtain a starch adhesive.

Embodiment 2

[0026] The cornstarch purchased in the market is used as raw material, and tap water is used as water source.

[0027] Put 30g of cornstarch and 70g of water into a three-neck round bottom flask, stir evenly, then heat up to 60°C, add 0.8ml of 30% hydrogen peroxide and 4ml of 0.1% copper sulfate, and oxidize for 4 hours.

[0028] After cooling the above oxidized solution, 10% sodium hydroxide solution was added to adjust the pH value to 9. Then 2 g of acetic anhydride were added while maintaining the pH at 9 with 10% sodium hydroxide solution. The addition was completed in about 20 minutes, and then reacted for 40 minutes.

[0029] Add the above solution to sodium benzoate and adjust the pH value to 5 with 10% sodium bisulfite solution, add water to make the total amount reach 200g, and then gelatinize at 70°C to obtain a starch adhesive.

Embodiment 3

[0031] The cornstarch purchased in the market is used as raw material, and tap water is used as water source.

[0032] Put 30g of cornstarch and 70g of water into a three-neck round bottom flask, stir evenly, then heat up to 60°C, add 0.8ml of 30% hydrogen peroxide and 4ml of 0.1% copper sulfate, and oxidize for 1.5 hours.

[0033] After cooling the above oxidized solution, 10% sodium hydroxide solution was added to adjust the pH value to 9. Then 1.5 g of acetic anhydride were added while maintaining the pH at 9 with 10% sodium hydroxide solution. The addition was completed in about 20 minutes, and then reacted for 40 minutes.

[0034] Add the above solution to sodium benzoate and adjust the pH value to 5 with 10% sodium bisulfite solution, add water to make the total amount reach 200g, and then gelatinize at 70°C to obtain a starch adhesive.

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Abstract

The invention provides a corn starch adhesive for a building and a preparation method thereof. The adhesive is prepared from the following components in parts by mass: 10-30 parts of corn starch, 50-150 parts of tap water, 0.1-0.8 part of oxidant, 0.5-2 parts of esterifying agent, 0.4-0.8 part of alkali, 0.4-0.5 part of acid regulating agent, 0.1-0.2 part of preservative, 0.005-0.001 part of tributyl phosphate and 0.01-0.02 part of catalyst, wherein the oxidant is hydrogen peroxide; the esterifying agent is acetic anhydride, maleic anhydride or phthalic anhydride; and the catalyst is ferrous sulfate, copper sulfate or ferric chloride. The corn starch adhesive is a starch adhesive formed by directly gelatinizing oxidized and esterified starch, has good bonding effect and has the advantages of simple process, low cost, no environment pollution and the like.

Description

technical field [0001] The invention relates to an adhesive, in particular to a cornstarch adhesive and a preparation method thereof. The adhesive can be used in architectural interior wall coatings, wallpaper adhesives, etc. Background technique [0002] With the emphasis on environmental protection, the development of non-polluting and non-toxic construction adhesives has become a development trend. Corn starch is a pure natural raw material with a wide source and low price. The adhesive made of corn starch has the advantages of non-corrosion, high bonding strength, no pollution, and low cost. Starch adhesives are widely used in textiles, papermaking, packaging cartons, corrugated cardboard, wood, etc., but there are few studies on starch adhesives for construction. Some researchers have made interior wall coatings from adhesives obtained by direct alkali gelatinization after cross-linking oxidized starch and formaldehyde, but the starch adhesives obtained by this method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J103/10C08B31/18C08B31/04
Inventor 方莉黄小平魏保利王小丽闫光红
Owner SHANXI UNIV
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