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Preparation method of irradiation and chemistry co-modified starch

A technology of compound modified starch and modified starch, which is applied in the field of modified starch, can solve the problems of gelatinization temperature lowering below 45°C, limited reduction of starch gelatinization temperature, singleness, etc., and achieve high reaction efficiency, good stability, and guaranteed viscosity and stability effects

Active Publication Date: 2016-03-30
广西农垦明阳生化有限公司
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

From the public literature, we can know that most of the current methods to reduce the gelatinization temperature of starch use a single chemical or physical treatment method, the reduction of starch gelatinization temperature is limited, and the use of wet denaturation can rarely reduce the gelatinization temperature to 45°C the following
And when the method of reducing starch molecular chains such as irradiation and acid hydrolysis lowers the gelatinization temperature of starch, due to the reduction and degradation of starch molecular weight, the viscosity and stability of starch are affected, and its performance is not good when used as a binder.

Method used

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  • Preparation method of irradiation and chemistry co-modified starch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] use 60 co γ - Radiation treatment of cassava starch, wherein the irradiation dose is 2KGY, the irradiation time is 1h, and the irradiation temperature is 38°C.

[0027] Disperse 500g of irradiated tapioca starch in 650mL of water (containing 5g of sodium carbonate), add 20g of vinyl acetate while stirring at 38°C, keep at 38°C for 1 hour, neutralize the pH value to 6.0 with dilute hydrochloric acid, filter, Washing and drying to get the finished product.

Embodiment 2

[0029] use 60 co γ - Radiation treatment of cassava starch, wherein the irradiation dose is 4KGY, the irradiation time is 1.5h, and the irradiation temperature is 40°C.

[0030] Take 500g of irradiated tapioca starch and disperse it in 550mL of water, add 10g of sodium hydroxide and sodium carbonate mixture as a catalyst, add 10g of vinyl acetate while stirring at 40°C, keep the reaction at 40°C for 1 hour, and neutralize the pH value with dilute sulfuric acid To 6.5, filter, wash, and dry to get the finished product.

Embodiment 3

[0032] use 60 co γ - Radiation treatment of cassava starch, wherein the irradiation dose is 2.2KGY, the irradiation time is 2.5h, and the irradiation temperature is 45°C.

[0033] Take 500g of irradiated tapioca starch and disperse it in 750mL of water (containing 25g of potassium hydroxide and sodium carbonate mixture), add 75g of vinyl acetate while stirring at 40°C, keep it at 40°C for 1.5h, and neutralize the pH value with dilute hydrochloric acid To 6.7, filter, wash, and dry to get the finished product.

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Abstract

The invention relates to a preparation method of an irradiation and chemistry co-modified starch. The preparation method comprises the following steps: irradiating starch by 60 Co gamma rays, and then subjecting the irradiation modified starch to a chemical esterification treatment so as to obtain the irradiation and chemistry co-modified starch. The obtained starch has the characteristics of low gelatinization temperature and strong bonding force, the stability of paste liquid (6%) is good, the viscosity of paste liquid barely changes, the starch is suitable for being used as an adhesive for spraying between layers during the production process of paper and paperboard, the starch has a good bonding force at a low drying temperature, and the drying cost is reduced. At the same time, due to the low primary gelatinization temperature, the peeling strength between the starch and paper or paper machine is reduced, and the phenomenon that the starch is adhered on the cylinder is reduced.

Description

technical field [0001] The invention belongs to the technical field of modified starch, and in particular relates to a preparation method of irradiation chemical compound modified starch. Background technique [0002] Modified starch adhesive is to improve the performance of starch and expand its application range, using physical, chemical or enzymatic treatment to introduce new functional groups on starch molecules or change the size of starch molecules and the properties of starch granules, thereby changing the gelatinization of starch Characteristics such as temperature, hot viscosity and its stability make it more suitable for the requirements of paper and board adhesive applications. Modified starch adhesive has the advantages of high bonding strength, high cardboard stiffness, no moisture absorption and softening, no corrosion, no pollution, and low cost of use. It is being adopted by more and more carton manufacturers. However, the initial gelatinization temperature ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/04C08B30/12C09J103/06
CPCC08B30/12C08B31/04C09J103/06
Inventor 王福标陈惠兰黎可
Owner 广西农垦明阳生化有限公司
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