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Method for preparing grafted modified starch

A technology of modified starch and starch, which is applied in fiber processing, textiles and papermaking, etc., can solve the problems of poor hydrophobicity, warp hairiness, low grafting efficiency, etc., and achieve good operability and stability , Saponification time is shortened, and water solubility is good

Inactive Publication Date: 2011-01-19
TIANJIN TIANFUTONG BIOTECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the post-treatment of grafted starch produced by the traditional process adopts oxidation treatment, which makes it impossible to achieve good results in terms of hydrophobicity. The grafting efficiency of polyester and other textiles is very low compared to the cerium salt standard, and the warp hairiness is not easy to adhere to. Fracture, and it will be difficult to desizing or even impossible to desizing

Method used

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  • Method for preparing grafted modified starch

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Effect test

Embodiment 1

[0018] A kind of preparation method of grafted starch, its steps are:

[0019] (1) Add 60kg of ordinary starch with water to make starch milk containing 30% starch, add 0.5L, 2% sulfuric acid, and heat up to 40°C for 2 hours of acidification;

[0020] (2) Nitrogen is fed into the acidified starch milk to get rid of the oxygen in the system, while the temperature is lowered to 20°C, and then 2kg manganese dihydrogen pyrophosphate and 3kg graft monomer acrylic acid, 2kg methyl acrylate, 3kg ethyl acrylate, 2kg vinyl acetate carry out graft copolymerization reaction, and the reaction time is 5 hours, forms starch copolymer;

[0021] (3) add 2kg caustic soda, 3kg sodium hypochlorite in the starch copolymer and carry out saponification aftertreatment, processing time 3 hours;

[0022] (4) Neutralize with sulfuric acid to make the pH value 7, then dehydrate, dry, pulverize, sieve, pack, and measure to obtain the finished product—grafted modified starch.

Embodiment 2

[0024] (1) Add water to 90kg of ordinary starch to make starch milk containing 35% starch, add 0.8L, 4% sulfuric acid, and heat up to 50°C for acidification for 3 hours;

[0025] (2) In the starch milk after the acidification, pass nitrogen to get rid of the oxygen in the system, simultaneously lower the temperature to 27 ℃, then add 3kg manganese dihydrogen pyrophosphate and 3kg graft monomer acrylic acid, 2kg methyl acrylate, 4 ethyl acrylates, 3kg vinyl acetate carry out graft copolymerization reaction, and the reaction time is 3 hours, forms starch copolymer;

[0026] (3) add 4kg caustic soda, 4kg sodium hypochlorite in the starch copolymer and carry out saponification aftertreatment, processing time 3.5 hours;

[0027] (4) Neutralize with sulfuric acid to make the pH value 6-8, then dehydrate, dry, pulverize, sieve, pack, and measure to obtain the finished product—grafted modified starch.

[0028] Further verify the advancement of the grafted modified starch product of t...

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Abstract

The invention relates to a method for preparing grafted modified starch. The method comprises the following steps of: (1) preparing starch milk from the common starch and then performing acidification for 1.5 to 2.5 hours; (2) introducing nitrogen into the acidified starch milk to remove oxygen from a system and then adding dihydrogen manganese pyrophosphate and grafted monomers of acrylic acid, methyl acrylate, ethyl acrylate and vinyl acetate sequentially to perform a graft copolymerization reaction; (3) adding sodium hydroxide and sodium hypochlorite into the starch copolymer to perform saponification aftertreatment; and (4) neutralizing by adding sulfuric acid until the pH value is 6 and 8, and then performing dehydration, drying, pulverization, sieving, packaging and metering to obtain the grafted modified starch finished product. The method has the advantages that: the properties of the grafted modified starch are stable; the process operation is simple; and chemicals used in the modifying process have low price and convenient and readily available source. The grafted modified starch product has the advantages of meeting a starching requirement, effectively reducing the cost of sizing agents and reducing pollution of PVA to ecological environment, along with excellent properties, stable quality and lower price.

Description

technical field [0001] The invention belongs to the field of textiles, in particular to a method for preparing a grafted modified starch used in textile warp yarn sizing. Background technique [0002] Starch is rich in resources, low in cost, and does not pollute the environment. It is widely used in textile warp yarn sizing. Due to the defects in the macromolecular structure of starch, it cannot meet the requirements of warp sizing containing synthetic fibers, so it is necessary to chemically or biologically denature starch, such as acid hydrolysis, enzymatic hydrolysis, oxidation, etherification, esterification and cationization. Although the modified starch has improved the sizing performance to a certain extent, it still cannot be used as the main size of the fine count polyester / cotton blended warp yarn according to the current sizing technology and production practice. Although PVA has obvious effects in warp yarn sizing, considering its sizing cost in fine-count poly...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08F8/00D06M15/263
Inventor 段梦麟于彤段立仁毛照宣张永清
Owner TIANJIN TIANFUTONG BIOTECH DEV
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