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A kind of preparation method of modified starch used in glass fiber sizing agent

A technology of modified starch and sizing agent, applied in the field of glass fiber yarn, can solve the problems of complex process, increased production cost, high raw material cost, etc., and achieve the effects of uniform distribution, reduced fiber breakage, and good wear resistance

Inactive Publication Date: 2018-06-29
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the modified starch in the current sizing agent is made of high-chain corn starch, and the cost of the raw material is high. In addition, the existing technology uses oxidative etherification or cross-linking etherification compound denaturation, the process is complicated, and the production cost is further increased.

Method used

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  • A kind of preparation method of modified starch used in glass fiber sizing agent
  • A kind of preparation method of modified starch used in glass fiber sizing agent
  • A kind of preparation method of modified starch used in glass fiber sizing agent

Examples

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Effect test

Embodiment 1

[0035] A modified starch used in glass fiber sizing agent is obtained by mixing cationic starch and amylose, and its preparation method is as follows:

[0036] (1) The cornstarch is adjusted into starch milk with a mass concentration of 35% with distilled water, and sodium sulfate equivalent to 5% of the starch mass is added to the starch milk;

[0037] (2) the pH of the NaOH solution regulating step (1) gained starch milk with 1mol / L is 10.0, adds the alkali catalyst NaOH that is equivalent to starch quality 5%, then adds the etherifying agent CHPTMA that is equivalent to starch quality 8%, in Stir and react at 40°C for 10 hours, then add 1mol / L HCl solution to adjust the pH of the starch milk to 4.0, end the reaction, and obtain the reacted starch milk;

[0038] (3) The starch milk after the reaction described in step (2) is extracted and washed 4 times with ethanol, and then washed 2 times with distilled water, and then the washed product is dried in a blast drying oven at ...

Embodiment 2

[0043] A modified starch used in glass fiber sizing agent is obtained by mixing cationic starch and amylose, and its preparation method is as follows:

[0044] (1) The pea starch is adjusted into starch milk with a mass concentration of 40% with distilled water, and sodium sulfate equivalent to 5% of the starch mass is added to the starch milk;

[0045] (2) the pH of the NaOH solution regulating step (1) gained starch milk with 1mol / L is 12.0, adds the alkali catalyst NaOH that is equivalent to starch quality 5%, then adds the etherifying agent CHPTMA that is equivalent to starch quality 10%, in Stir and react at 45°C for 16 hours, then add 1 mol / L HCl solution to adjust the pH of the starch milk to 5.0, end the reaction, and obtain the reacted starch milk;

[0046] (3) The starch milk after the reaction described in step (2) is extracted and washed 4 times with ethanol, and then washed 2 times with distilled water, and then the washed product is dried in a blast drying oven at ...

Embodiment 3

[0077] A modified starch used in glass fiber sizing agent is obtained by mixing cationic starch and amylose, and its preparation method is as follows:

[0078] (1) adjusting the rice starch into starch milk with a mass content of 45% with distilled water, adding sodium sulfate equivalent to 5% of the starch mass in the starch milk;

[0079] (2) the pH of the NaOH solution regulating step (1) gained starch milk with 1mol / L is 12.0, adds the alkali catalyst NaOH that is equivalent to starch quality 10%, then adds the etherification agent GTA that is equivalent to starch quality 10%, in Stir and react at 45°C for 12 hours, then add 1mol / L HCl solution to adjust the pH of the starch milk to 5.0, end the reaction, and obtain the reacted starch milk;

[0080] (3) The starch milk after the reaction described in step (2) is extracted and washed 4 times with ethanol, and then washed 2 times with distilled water, and then the washed product is dried in a blast drying oven at 45°C, pulve...

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Abstract

The invention discloses a preparation method of modified starch used as a glass fiber sizing agent. In the preparation method, the starch is put into a reaction container, water is added, an expansion inhibitor is added, the pH is adjusted to 10-12 under stirring, an alkali catalyst is added, an etherification agent is added, and the reaction is carried out at a temperature of 40-45° C. for 10-16 hours. , after the reaction is completed, adjust the pH to 4 to 5, and after cooling down to room temperature, suction filter, and dry the solid to obtain cationic starch; mix the cationic starch and amylose in a mass ratio of 1:1 to 1:2 evenly, The modified starch product used for glass fiber sizing can be obtained; the product prepared by the invention has good film-forming properties, high film strength and good elasticity, and the sizing can be evenly distributed on the fiber, reducing the migration tendency of the sizing and reducing the The tendency of the sizing to form a gel plays a role in improving the drying of the film and protecting the fibers, which has significant cost and process advantages.

Description

technical field [0001] The invention relates to the technical field of glass fiber yarns, in particular to a modified starch used in a glass fiber sizing agent and a preparation method thereof. Background technique [0002] Glass fiber is a reinforced inorganic material with excellent properties such as high strength, low moisture absorption, corrosion resistance, small specific gravity, and good electrical insulation. It is widely used in construction, transportation, electronics, aerospace, energy, chemical industry, and national defense. The use of sizing can increase the strength of the glass fiber, lubricate the bundled monofilaments and protect the fiber surface from damage. Starch sizing has the advantages of non-toxic raw materials, simple post-treatment, easy cleaning, low decomposition temperature, and clean and tidy cloth surface after treatment. [0003] According to the type of chemical bond between starch and cationic groups, cationic starch can be divided int...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C25/321C08B31/12
Inventor 高群玉李航杨公尚丁世海马德敏吴磊张淑芬朱津
Owner SOUTH CHINA UNIV OF TECH
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