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Method for preparing modified starch by oxidation and succinic anhydride esterification

A technology of succinic anhydride ester and modified starch, which is applied in the field of preparation of composite modified starch, and can solve problems such as yarn stains, poor thermal stability, and few applications of textile size

Inactive Publication Date: 2012-05-23
内蒙古奈伦农业科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the size film has poor thermal stability, and it is easy to cause yarn stains when heated and melted.
The industrial production of succinic anhydride-modified starch began in the 1950s, and it is widely used in the paper industry, but it is rarely used in textile pulp

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1 Potato oxidized succinic anhydride esterified modified starch

[0035] Prepare potato oxidized succinic anhydride esterified starch according to the following steps:

[0036] 1). Adjust the raw potato starch and water into starch milk according to the mass ratio of 1:1;

[0037] 2). Start heating to raise the temperature of starch milk to 40.0°C, adjust the pH value to 8.0 with 2% sodium hydroxide solution, and slowly add industrial grade sodium hypochlorite equivalent to 0.3% of the original starch mass (calculated as 100% sodium hypochlorite) solution, the oxidation reaction has been kept at 8.5-9.5 throughout the process, while maintaining the temperature at 40-42 ° C; from the calculation of the addition of sodium hypochlorite, the oxidation reaction should continue for 1.5 hours;

[0038] 3). After the oxidation reaction is finished, use 0.005% sodium sulfite relative to the original starch mass to remove chlorine, which can be detected by starch potassi...

Embodiment 2

[0043] Example 2 Potato oxidized succinic anhydride esterified modified starch

[0044] Prepare potato oxidized succinic anhydride esterified starch according to the following steps:

[0045] 1). Adjust the raw potato starch and water into starch milk according to the mass ratio of 1:1;

[0046] 2). Start heating to raise the temperature of starch milk to 42°C, adjust the pH value to 8.5 with 4% sodium hydroxide solution, and slowly add industrial grade sodium hypochlorite equivalent to 1.0% of the original starch mass (calculated as 100% sodium hypochlorite) Solution, the oxidation reaction has been kept at 9.0-9.2 throughout the process, while maintaining the temperature at 40-41 ° C; from the calculation of the addition of sodium hypochlorite, the oxidation reaction should continue for 2 hours;

[0047] 3). After the oxidation reaction is finished, use 0.0015% sodium sulfite relative to the original starch mass to remove chlorine completely;

[0048] 4). Stop heating and ...

Embodiment 3

[0052] Example 3 Potato oxidized succinic anhydride esterified modified starch

[0053] Prepare potato oxidized succinic anhydride esterified starch according to the following steps:

[0054] 1). Adjust the raw potato starch and water into starch milk according to the mass ratio of 1:1;

[0055] 2). Start heating to raise the temperature of starch milk to 41.0°C, adjust the pH value to 8.35 with 3% sodium hydroxide solution, and slowly add industrial grade sodium hypochlorite equivalent to 0.7% of the original starch mass (calculated as 100% sodium hypochlorite) Solution, the oxidation reaction has been kept at 9.1-9.2 throughout the process, while maintaining the temperature at 41-42 ° C; from the calculation of the addition of sodium hypochlorite, the oxidation reaction should continue for 2.5 hours;

[0056] 3). After the oxidation reaction is finished, use 0.008% sodium sulfite relative to the original starch mass to remove chlorine;

[0057] 4). Stop heating and lower t...

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Abstract

The invention provides a method for preparing modified starch by oxidation and succinic anhydride esterification. The method comprises the following steps of: dissolving starch into water to form starch milk, performing oxidation reaction on sodium hypochlorite oxidant and starch to obtain oxidized starch, then removing chlorine, performing esterification reaction by adopting succinic anhydride, and finally dehydrating and drying the reaction product to obtain the modified starch. When the modified starch prepared by the method is used as starch size, the modified starch has the properties ofgood fluidity, low viscosity and high-concentration use of the oxidized starch; and because the succinic anhydride esterification solves the problem of poor thermal stability of the oxidized starch, the modified starch has the advantages that: adhesion of warps is remarkably improved; a size film has strong forming capability, good mechanical strength and extensibility; the paste has stable viscosity and good fluidity; the size has certain moisture absorption property; the modified starch has good co-solvency with a synthetic size; the film is easy to dissolve in water, and de-sizing is easy;and the paste has high thermal stability, is not affected by high-temperature melting and the like.

Description

technical field [0001] The present application relates to a preparation method of composite modified starch, more specifically, relates to a preparation method of oxidized succinic anhydride esterified modified starch used in the field of textile size. Background technique [0002] In the textile industry, warp yarns for fabrics are staple fibers spun from natural fibers such as cotton, wool, silk, hemp, man-made fibers such as viscose and acetate fibers, and synthetic fibers such as polypropylene, nylon, and polyester. Blended yarn, filament yarn and blended filament, etc. During the weaving process, the warp and weft yarns are subject to different mechanical actions. Each warp yarn not only has to rub against each other, but also has to contact thousands of weft yarns successively, so the friction is very intense. At the same time, due to the opening, picking, and beating-up movement of the loom, the friction between the yarn and the heddle, reed, and warp stopper will c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B31/18C08B31/04D06M15/11
Inventor 张丽娜吕春林周庆锋
Owner 内蒙古奈伦农业科技股份有限公司
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