Preparation method of modified starch for glass fiber cloth

A glass fiber and starch technology, used in textiles and papermaking, can solve the problem of high cost, reduce production costs and meet the effect of wear resistance

Inactive Publication Date: 2020-04-28
河南新孚望新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polymer composite materials such as silica gel and polytetrafluoroethylene are currently the most commonly used coating materials in the glass fiber cloth industry, but the cost is relatively high

Method used

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  • Preparation method of modified starch for glass fiber cloth

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) Feeding, in parts by mass, fully dissolve 9 parts of sodium chloride in 140 parts of water, add 100 parts of starch to make starch milk and stir for 30-60 minutes;

[0019] 2) Etherification and denaturation, after the starch milk in step 1) is stirred evenly, after the concentration is 2-3wt% alkali solution is added dropwise to adjust the pH to 11.4, then 9 parts of propylene oxide is added in parts by mass, and 2-3wt% alkali solution, maintaining the pH at 11.4, and adjusting the pH to 7 after reacting at 39° C. for 20 h. The lye with a concentration of 2-3wt% is prepared from soda ash. The proportion of this concentration is to maintain the reaction efficiency on the one hand, and on the other hand to prevent starch gelatinization when added. Of course, soda ash can also be other substances that can adjust pH replace;

[0020] 3) Oxidation treatment. After the starch etherification in step 2) is completed, add 0.1 part of copper sulfate in parts by mass, add 4 p...

Embodiment 2

[0025] This embodiment provides a method for preparing modified starch for glass fiber cloth,

[0026] 1) Feeding, in parts by mass, fully dissolve 7 parts of sodium chloride in 180 parts of water, add 100 parts of starch to make starch milk and stir for 30-60 minutes;

[0027] 2) Etherification and denaturation, after the starch milk in step 1) is stirred evenly, after adding a concentration of 2-3wt% lye dropwise to adjust the pH to 11.8, add 5 parts of propylene oxide in parts by mass, and use 2-3wt% alkali solution, maintain the pH at 11.8, and adjust the pH to 8 after reacting at 40°C for 16 hours;

[0028] 3) Oxidation treatment. After the starch etherification in step 2) is completed, add 0.2 parts of copper sulfate in parts by mass, add 5 parts of hydrogen peroxide with an effective content of 27%, react for 6 hours, and add 0.2 parts of sodium metabisulfite to terminate the reaction.

[0029] 4) Drying. After the starch milk oxidation in step 3) is completed, cyclone...

Embodiment 3

[0031] 1) Feeding, in parts by mass, fully dissolve 9 parts of sodium chloride in 200 parts of water, add 100 parts of starch to make starch milk and stir for 30-60 minutes;

[0032] 2) Etherification and denaturation, after the starch milk in step 1) is stirred evenly, after adding 2-3wt% lye dropwise to adjust the pH to 12, add 10 parts of propylene oxide in parts by mass, and use 2-3wt% alkali solution, maintain the pH at 12, and adjust the pH to 6 after reacting at 38°C for 16 hours;

[0033] 3) Oxidation treatment. After the starch etherification in step 2) is completed, add 0.2 parts of copper sulfate in parts by mass, add 5 parts of hydrogen peroxide with an effective content of 27%, react for 6 hours, and add 0.2 parts of sodium metabisulfite to terminate the reaction.

[0034] 4) Drying. After the starch milk oxidation in step 3) is completed, cyclone washing and drying are carried out.

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Abstract

The invention discloses a preparation method of modified starch for glass fiber cloth, which comprises the following steps: 1) feeding: fully dissolving 7-9 parts by mass of sodium chloride in 130-200parts by mass of water, adding 100 parts by mass of starch to prepare starch milk, and stirring for 30-60 minutes; 2) etherification denaturation: after the starch milk in the step 1) is uniformly stirred, dropwise adding alkali liquor to adjust the pH value to 11-12, adding 5-10 parts by mass of epoxypropane, reacting at 38-40 DEG C for 16-20 hours, and adjusting the pH value to 6-8; and 3) oxidation treatment: after starch etherification in the step 2) is finished, adding 0.1-0.2 part by mass of copper sulfate and 4-5 parts by mass of hydrogen peroxide with the effective content of 27%, reacting for 6 hours, and adding 0.1-0.2 part by mass of sodium pyrosulfite to terminate the reaction. The modified starch can tolerate high-temperature, mechanical shearing and acid environments, provides a good bonding effect and maintains uniform body state, so that the adhesive has heat resistance, acid resistance and shearing resistance.

Description

technical field [0001] The invention belongs to the technical field of glass fiber cloth coating materials, and in particular relates to a preparation method of modified starch for glass fiber cloth. Background technique [0002] Glass fiber cloth has the characteristics of good chemical stability, wear resistance and good toughness, making it widely used. In the prior art, the research on materials for glass fiber cloth coating is not very sufficient. Polymer composite materials such as silica gel and polytetrafluoroethylene are currently the most commonly used coating materials in the glass fiber cloth industry, but the cost is relatively high. Contents of the invention [0003] The purpose of this invention is to provide a kind of preparation method of modified starch for glass fiber cloth, solve the above problems. [0004] The purpose of the present invention is achieved through the following technical solutions: [0005] A kind of preparation method of modified st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/18C08B31/12D06N3/00
CPCC08B31/12C08B31/18D06N3/00D06N3/0022D06N2209/043D06N2209/067D06N2209/103D06N2209/143D06N2209/1685
Inventor 丁世海孙春芳马德敏谢军红张亚蕊
Owner 河南新孚望新材料科技有限公司
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