Method for producing compound modified starch

A compound modified starch and starch technology, which is applied in the field of chemical adhesives, can solve the problems of poor practicability and narrow application fields, and achieve the effects of good film-forming property, stable viscosity and strong water absorption

Inactive Publication Date: 2012-12-19
赵贵喜
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a method for producing composite modified starch in order to solve the problems that most of the existing modified starches use a modified method to process the starch, the application field is narrow, and the practicability is poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] A method for producing compound modified starch, comprising the following steps: (1) mixing tapioca starch with water to form a starch slurry, wherein the starch content in the starch slurry is 50% by mass; (2) in step (1) ) into the starch slurry obtained by adding sodium hypochlorite solution in an amount of 4% by weight of the starch, and oxidizing it at 40°C for 2 hours; (3) adding a cross-linking agent dimethylolurea to the mixture obtained in step (2) , carry out cross-linking reaction at 30°C for 2.5 hours, and the amount of cross-linking agent added is 0.1% by weight of starch; (4) After the reaction is completed, adjust the pH value of the slurry to 7.5; (5) Wet screen the obtained slurry , washed, and then input into a pre-gelatinization dryer for dehydration and drying at 150°C to obtain the composite modified starch of the present invention, which is white, has no peculiar smell, has a pH value of 4.5, and has a viscosity stability of 100%.

Embodiment 2

[0011] A method for producing compound modified starch, comprising the following steps: (1) mixing potato starch with water to form starch slurry, wherein the starch content in the starch slurry is 60% by mass; (2) in step (1) ) into the starch slurry obtained by adding sodium hypochlorite solution in an amount of 6% by weight of the starch, and oxidizing it at 65°C for 3 hours; (3) adding a cross-linking agent dimethylolurea to the mixture obtained in step (2) , carry out cross-linking reaction at 50°C for 3.5 hours, and the amount of cross-linking agent added is 0.5% by weight of starch; (4) After the reaction is completed, adjust the pH value of the slurry to 8.5; (5) Wet screen the obtained slurry , washed, and then input into a pregelatinization dryer for dehydration and drying at 170°C to obtain the composite modified starch of the present invention, which is white, has no peculiar smell, has a pH value of 4.0, and has a viscosity stability of 98%.

Embodiment 3

[0013] A method for producing compound modified starch, comprising the following steps: (1) mixing tapioca starch with water to form a starch slurry, wherein the starch content in the starch slurry is 50% by mass; (2) in step (1) ) into the starch slurry obtained by adding sodium hypochlorite solution in an amount of 4% by weight of the starch, and oxidizing it at 55°C for 3 hours; (3) adding a cross-linking agent dimethylolurea to the mixture obtained in step (2) , carry out cross-linking reaction at 45°C for 2.5 hours, and the amount of cross-linking agent added is 0.3% by weight of starch; (4) After the reaction is completed, adjust the pH value of the slurry to 8; (5) Wet screen the obtained slurry , washed, and then input into a pre-gelatinization dryer for dehydration and drying at 160°C to obtain the composite modified starch of the present invention, which is white, has no peculiar smell, has a pH value of 5.0, and has a viscosity stability of 100%.

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Abstract

The invention relates to the field of chemical adhesive, in particular to a method for producing compound modified starch. The method solves problems that existing modified starch is treated by a modification method mostly, is narrow in application range and poor in practicality, and the like. The method includes steps of (1), mixing starch with water to blend into starch slurry; (2), adding sodium hypochlorite into the starch slurry to perform oxidization reaction; (3), adding dimethylol urea which is a crosslinking agent into the mixture to perform crosslinking reaction; (4), regulating the pH (potential of hydrogen) value of the slurry to range from 7.5 to 8.5 after the reaction; and (5), performing wet screening and washing for the slurry obtained in the step (4), and then feeding the slurry into a pre-gelatinization drying machine to dehydrate and dry. Carboxyl is added into starch molecules during reaction, so that the starch molecules have the characteristics of hydrophilicity and lipophilicity and have good emulsification and dispersion effects. In addition, the dimethylol urea is added into the starch molecules for performing the crosslinking reaction, so that the compound modified starch has the advantages of stable viscosity, high water absorption, shearing resistance and alkali resistance, good film-forming property and the like, and can be applied to various fields.

Description

technical field [0001] The invention relates to the field of chemical adhesives, in particular to a method for producing compound modified starch. Background technique [0002] Although the history of starch application in my country is very long, due to various reasons, the research and development, production and application of starch and modified starch in my country are quite backward. Until 1978, the annual output of starch in China was only 280,000 tons, and modified starch was almost blank. At the end of the 1990s, the improvement of the national food situation provided the possibility for the development of starch and modified starch, and the economic development and the improvement of various product grades made it necessary. After more than 30 years of development, the current national starch production is 3 million tons, or 2.5 kilograms per capita, but there is still a big gap compared with Japan's per capita 25 kilograms and the United States' per capita 66 kilog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/18C08J3/24
Inventor 赵贵喜
Owner 赵贵喜
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