Method for preparing etherification-oxidation-grafting multiple-modified starches

A multi-modified starch and oxidized starch technology, applied in the field of modified starch, can solve problems such as no research reports, and achieve the effects of high freeze-thaw stability, soft film, and good film-forming properties

Active Publication Date: 2014-12-24
GUANGXI UNIV FOR NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] From the public literature, we can know that the current multivariate modified starches include: oxidation-esterification-grafting three-component composite modified starch, etherification-crosslinking-pregelatinization three-component c...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Mix 100g of tapioca starch, 1.1g of sodium carbonate, 1g of sodium hydroxide, 0.02g of copper sulfate, 1.5g of hydrogen peroxide, and 5g of chloroethanol, and place the resulting mixture in a microwave reactor for microwave reaction. The microwave power is 320W, and the microwave time 3 minutes to obtain hydroxyethyl etherified oxidized starch; add 0.13g of sodium sulfite to reduce residual oxidant, add 25g of sodium carbonate, 11g of hydrogen peroxide-ferrous sulfate initiation system, 25g of ethyl acetate, 10g of propylene acetate, and mix well , the resulting mixture is placed in a microwave reactor using an open system method for graft copolymerization, the microwave power is 240W, the microwave time is 6 minutes, and the resulting product is post-treated to obtain the product of the present invention.

Embodiment 2

[0036] 100g of tapioca starch, 18g of sodium hydroxide, 0.05g of copper sulfate, 4.5g of hydrogen peroxide, and 45g of chloroacetic acid were thoroughly mixed evenly, and the resulting mixture was placed in a microwave reactor for microwave reaction. The microwave power was 320W, and the microwave time was 6 minutes. Carboxymethyl etherified oxidized starch; adding 0.2 g of sodium sulfite to reduce residual oxidant, adding 20 g of sodium carbonate, 10 g of potassium hydroxide, 17 g of hydrogen peroxide-ferrous sulfate initiation system, 45 g of vinyl acetate, and 12 g of methacryl alcohol acetate, And fully mixed uniformly, the obtained mixture is placed in a microwave reactor to carry out graft copolymerization by open system method, the microwave power is 240W, and the microwave time is 12 minutes, and the obtained product is post-treated to obtain the product of the present invention.

Embodiment 3

[0038] Mix 100g of tapioca starch, 2.8g of potassium hydroxide, 0.05g of copper sulfate, 1g of sodium persulfate, and 9g of chloroethanol, and place the resulting mixture in a microwave reactor for microwave reaction. The microwave power is 320W, and the microwave time is 4 minutes. , to obtain hydroxyethyl etherified oxidized starch; add 0.35 g of sodium bisulfite to reduce the residual oxidant, add 22 g of sodium carbonate, 12 g of hydrogen peroxide-ferrous sulfate initiation system, 45 g of propylene acetate, and 21 g of methacryl alcohol acetate, And fully mix evenly, put the obtained mixture in a microwave reactor and adopt the open system method to carry out the graft copolymerization reaction, the microwave power is 240W, the microwave time is 6 minutes, the obtained product is post-treated to obtain the product of the present invention.

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Abstract

The invention discloses a method for preparing etherification-oxidation-grafting multiple-modified starches. The method comprises the following steps: using native starch as a raw material, adding an etherifying agent, an oxidizing agent and a composite catalyst, and completing etherification and oxidation reaction with one step by adopting a microwave semidry method; using the obtained etherified and oxidized starch as a raw material, adding an initiating agent, a basic catalyst and a composite vinyl monomer, and carrying out graft copolymerization reaction by adopting an open system method in a microwave reactor. The three modification methods of etherification, oxidation and grafting are organically combined, and a variety of reactive groups are grafted in the molecular structure of starch, the method enhances the advantages and avoid weaknesses and has complementary advantages. By regulating a process formula, the method can obtain a series of multiple-modified starches with different ratios of reactive groups and different grafting ratios. The multiple-modified starches have various good characteristics of carboxymethyl-etherified and/or hydroxyalkyl-etherified, oxidized and grafting starches and can be applied to the fields of papermaking, food, textile, daily chemical industry, polymeric flocculants, super absorbent materials, oilfield chemical materials, biodegradable mulch film and plastics and the like.

Description

technical field [0001] The invention belongs to the technical field of modified starch, and in particular relates to a preparation method of etherification-oxidation-grafting multivariate modified starch. Background technique [0002] Multivariate modified starch refers to starch with two or more reactive groups such as anion, cation or non-ion connected to the same starch molecule, and is a new type of starch developed on the basis of single modified starch such as anion, cation and non-ion. The purpose of derivatives is to strengthen the performance of a certain aspect of modified starch, making it more effective in practical applications, with wider use conditions and wider application fields. By choosing different reactive groups, different proportions and different process conditions, multiple modified starch products with different special properties can be prepared. In recent years, many domestic starch scientific research workers are active in the preparation and ap...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08B31/18C08B31/12
Inventor 韦爱芬宋思思
Owner GUANGXI UNIV FOR NATITIES
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