Preparation of grafting modified starch sizing agent

A technology of modified starch and size, which is applied in fiber types, textiles and papermaking, fiber treatment, etc. It can solve environmental pollution and other problems, achieve good thermal stability of viscosity, low viscosity, and overcome poor wear resistance.

Inactive Publication Date: 2010-06-23
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a preparation method of grafted modified starch size, the resulting product has excellent sizing performance, is easy to biodegrade, can completely replace polyvinyl alcohol size and is applied to textile warp yarn sizing, and solves the problems caused by polyvinyl alcohol size. Environmental pollution problems caused by desizing in the printing and dyeing industry

Method used

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  • Preparation of grafting modified starch sizing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In the aqueous suspension of cornstarch with a mass percent concentration of 5%, add ethyl acrylate monomer with 5% starch mass, adjust the pH value to 3 with 0.5mol / L sulfuric acid, and then add redox initiator H 2 o 2 -FeSO 4 , H 2 o 2 and FeSO 4 The dosages are respectively 0.1% and 0.01% of the starch mass. Under nitrogen protection, stir and react at 45°C for 2.5 hours, adjust the pH value to 7 with 0.5mol / L sodium hydroxide solution, filter and fully wash with water, and dry Dry pulverization to obtain grafted modified starch slurry, the indexes of which are shown in Table 1.

Embodiment 2

[0019] In the potato starch aqueous suspension with a mass percent concentration of 20%, add ethyl acrylate monomer with 10% starch mass, adjust the pH value to 4 with 1.5mol / L sulfuric acid, and then add redox initiator H 2 o 2 -FeSO 4 , H 2 o 2 and FeSO 4 The dosages are respectively 1% and 0.2% of the starch mass. Under nitrogen protection, stir and react at 55°C for 3.5 hours, adjust the pH value to 6 with 1.5mol / L sodium hydroxide solution, filter and fully wash with water, and dry Dry pulverization to obtain grafted modified starch slurry, the indexes of which are shown in Table 1.

Embodiment 3

[0021] In the cassava starch aqueous suspension with a mass percent concentration of 30%, add ethyl acrylate monomer with a starch mass of 20%, adjust the pH value to 3.5 with 1mol / L sulfuric acid, and then add redox initiator H 2 o 2 -FeSO 4 , H 2 o 2 and FeSO 4 The dosages are 3% and 1% of the starch mass respectively, under the protection of nitrogen, stir and react at 50°C for 3 hours, adjust the pH value to 6.5 with 1mol / L sodium hydroxide solution, filter and fully wash with water, and dry Pulverize to obtain the grafted modified starch slurry, and its indexes are shown in Table 1.

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Abstract

The invention provides a preparation method of starch graft copolymer slurry, which is characterized by the preparation steps: in a starch-aqueous suspension with a weight percentage of 5 percent to 50 percent, ethyl acrylate monomer, with an amount of 5 percent to 40 percent of the weight of starch, is added, and the pH value is regulated to 3 to 4 by a diluted acid; hydrogen peroxide and ferrous sulfate are added, the amounts are respectively 0.1 percent to 5 percent of the weight of starch and 0.01 percent to 2 percent of the weight of starch, and under the protection of nitrogen, mixing and reaction are carried out for 2.5h to 3.5h under 45 DEG C to 55 DEG; the pH value is regulated to 6 to 7 by diluted alkali; and after filtering and washing by water, a product is dried and crushed. The method uses a suitable graft monomer and adopts the wet processing method; the starch graft copolymer slurry obtained not only has good sizing performance, easy biodegradation and good wearing resistance, but also can replace vinyl alcohol in the sizing of textile warp and solve the environmental pollution caused by the desizing in printing and dyeing industries by polyvinyl alcohol slurry.

Description

technical field [0001] The invention relates to a preparation method of grafted modified starch size, and belongs to the technical field of modified starch size used for textile warp yarn sizing. Background technique [0002] Textile warp sizing is a key process in the warp preparation process before weaving. Its purpose is to strengthen, maintain stretch, wear resistance and fit hairiness, so as to improve the weavability of warp yarn and ensure product quality. [0003] Starch, polyvinyl alcohol (PVA), and acrylic size are three major types of size commonly used in the current textile warp yarn sizing. The main size in warp sizing is starch and polyvinyl alcohol. Because polyvinyl alcohol is highly polluting to the environment, it is not easy to biodegrade, and long-term deposition will cause ecological damage. It is now listed as "unclean" slurry, which has attracted extensive attention in the textile industry. "Using no or less polyvinyl alcohol" is one of the developm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/00D06M15/11D06M101/32D06M101/06
Inventor 张斌郁崇文郭建生钟晓敏马越跃刘星辰
Owner DONGHUA UNIV
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