Preparation of grafting modified starch sizing agent

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...

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