Preparing method for modified starch in glass fiber impregnating compounds

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

Inactive Publication Date: 2015-11-11
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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  • Preparing method for modified starch in glass fiber impregnating compounds
  • Preparing method for modified starch in glass fiber impregnating compounds
  • Preparing method for modified starch in glass fiber impregnating compounds

Examples

Experimental program
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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) adjusting the pea starch with distilled water into starch milk with a mass concentration of 40%, adding sodium sulfate equivalent to 5% of the starch mass in 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 45°C, pu...

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 preparing method for modified starch in glass fiber impregnating compounds. The preparing method includes the steps that starch is thrown into a reaction container, water is added, expansive retarders are added, and the pH is adjusted to 10 to 12 in the stirring state; base catalysts are added, then etherifying agents are added, the reaction is carried out at the temperature of 40 DEG C to 45 DEG C for 10 hours to 16 hours, and the pH is adjusted to 4 to 5 after the reaction is completed; after the temperature of the mixture is reduced to the indoor temperature, suction filtration is carried out, and solid substances are dried to obtain cationic starch; the cationic starch and amylase are evenly mixed according to the mass ratio of 1:1 to 1:2, and the modified starch product used for the glass fiber impregnating compounds is obtained. The product prepared with the preparing method has the good film forming performance, films are high in strength and good in elasticity, the impregnating compounds can be evenly distributed on fibers, the aptitude that the impregnating compounds migrate and the aptitude that the impregnating compounds form gel are reduced, the effects of improving the dryness of the films and protecting the fibers are achieved, and the remarkable cost advantage and the remarkable technology advantage are achieved.

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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IPC IPC(8): C03C25/26
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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