Preparation method of low-viscosity cassava composite modified starch

A technology for compounding modified starch and tapioca starch, applied in the field of tapioca starch, can solve the problems of high production cost, shedding of esterification groups, increase in the amount of esterification agent, etc.

Active Publication Date: 2014-02-05
GUANGXI HONGHAO STARCH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the esterification is carried out first and then the viscosity is reduced, the attached esterification groups will

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The esterifying agent is composed of acetic anhydride and chloroacetic acid in a molar ratio of 1:1, tapioca starch and esterifying agent are uniformly mixed in a molar ratio of 1:2, and reacted in a water bath at a temperature of 35°C with sodium hydroxide as a catalyst to obtain acetic acid Ester starch, carboxymethyl starch and mixtures of starches containing acetyl groups and carboxymethyl groups. Pass the obtained modified starch through 60 C 0 Y-ray irradiation, under the conditions of irradiation dose of 9.0kGy, irradiation time of 30 minutes, and irradiation temperature of 25°C, the viscosity can be obtained as 60mpa.s (dry basis 10%, blookfield RVT viscometer) cassava compound modified starch.

Embodiment 2

[0018] The esterifying agent is composed of acetic anhydride and chloroacetic acid in a molar ratio of 2:1, tapioca starch and esterifying agent are uniformly mixed in a molar ratio of 1:2.5 and reacted in a water bath at a temperature of 40°C with sodium hydroxide as a catalyst to obtain acetic acid Ester starch, carboxymethyl starch and mixtures of starches containing acetyl groups and carboxymethyl groups. Pass the obtained modified starch through 60 C 0 Irradiated by Y-rays, the irradiation dose is 15.0kGy, the irradiation time is 40 minutes, and the irradiation temperature is 30°C, the obtained viscosity is 40mpa.s (dry basis 10%, blookfield RVT viscometer) cassava compound modified starch.

Embodiment 3

[0020] The esterifying agent is composed of acetic anhydride and chloroacetic acid in a molar ratio of 3:1, tapioca starch and esterifying agent are uniformly mixed in a molar ratio of 1:3 and reacted in a water bath at a temperature of 50°C with sodium hydroxide as a catalyst to obtain acetic acid Ester starch, carboxymethyl starch and mixtures of starches containing acetyl groups and carboxymethyl groups. Pass the obtained modified starch through 60 C 0 Y-ray irradiation, under the conditions of irradiation dose of 18.5kGy, irradiation time of 60 minutes, and irradiation temperature of 32°C, the available viscosity is 20mpa.s (dry basis 10%, blookfield RVT viscometer) cassava compound modified starch.

[0021] Through the esterification reaction, acetate starch, sodium carboxymethyl starch, and a mixture of modified starches containing acetyl groups and carboxymethyl groups are obtained. The mixture has higher stability to acid, alkali and heat, and better emulsification,...

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PUM

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Abstract

The invention relates to cassava starch, and particularly relates to low-viscosity composite modified starch, belonging to the technical field of weaving. The preparation method of the low-viscosity cassava composite modified starch comprises the following steps of carrying out esterification reaction on cassava starch and an esterifying agent under the effect of catalysts so as to obtain esterification starch, and irradiating the esterification starch, thereby obtaining the low-viscosity cassava composite modified starch. The esterified starch is irradiated, and other indexes are all not affected except the reduction of the viscosity. Products with different viscosities can be obtained by controlling the irradiation condition. The technique provided by the invention has the advantages of simple process, low energy consumption, few public hazards, easiness in automation, safety, reliability and the like.

Description

technical field [0001] The invention relates to a tapioca starch, in particular to a low-viscosity composite modified starch. It belongs to the technical field of textiles. Background technique [0002] my country is a big producer of natural starch and has abundant cassava starch resources. Esterified starch and carboxymethyl starch are used to make paper coating adhesives or for textile sizing, which have excellent application effects, increase the swelling and dispersibility of natural starch granules, reduce the coagulation and sedimentation of natural starch, and improve the Transparency, but also improved film-forming properties. However, the viscosity of esterified starch and carboxymethyl starch is the same as that of natural starch, and the viscosity is very high. When the gelatinization concentration reaches 6%, it is already very thick; when used as papermaking coating adhesive and textile sizing agent, its use concentration generally reaches 10%. , or even mor...

Claims

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Application Information

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IPC IPC(8): C08B31/04C08B31/12C08B31/16C08J3/28
Inventor 王自豪危然卢贵光陆永达
Owner GUANGXI HONGHAO STARCH DEV
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