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Preparation method of graft starch

A technology for grafting starch and starch, applied in the field of preparation of grafted starch, can solve the problems of high viscosity, unfavorable grafting reaction, reduced yield of grafted starch, high price of grafted starch, etc., and achieves easy environmental pollution and large-scale implementation. Value and socio-economic benefits, low-cost effects

Inactive Publication Date: 2008-07-16
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the grafted starch synthesized is generally prepared by suspension and emulsion graft polymerization of starch dispersed in water, but the product of this method is not conducive to grafting reaction due to the high viscosity of starch after gelatinization in water. In order to reduce the viscosity of the grafted reactant, it is convenient Stirring, generally the concentration of starch is very low, which will greatly reduce the yield of grafted starch, generate a large amount of waste water, consume a large amount of energy, and make the subsequent separation process difficult, resulting in expensive grafted starch and difficult Industrial application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: Effect of reaction temperature on grafting rate

[0036] Add 200 grams of corn starch, 400 grams of industrial ethanol, and 200 grams of deionized water into a 1000 ml four-necked reaction flask equipped with a reflux condenser, swell at 50°C for 30 minutes, heat up to the specified temperature, and add 1 gram of diphenyl peroxide dropwise Formyl (BPO) and 50 grams of styrene, drip in 2 hours, react at a constant temperature for 3 hours, filter, wash the product, and determine the grafting rate after drying. The grafting rate of starch at different temperatures is shown in Table 1:

[0037] Table 1: The effect of reaction temperature on grafting rate

[0038] Reaction temperature, ℃

Embodiment 2

[0039] Example 2: Effect of reaction time on grafting rate

[0040] Add 300 grams of sweet potato starch, 500 grams of edible ethanol, and 100 grams of deionized water to 1000 ml of four-necked reaction flask equipped with reflux condenser, swell at 50°C for 30 minutes, heat up to 80°C, and add 10 grams of 20% mass concentration dropwise After 2 hours of dripping with potassium persulfate aqueous solution and 100 grams of vinyl acetate, the constant temperature reaction time is different, the product is filtered, washed, and the grafting rate is determined after drying. The starch grafting rate of different constant temperature reaction time is shown in Table 2:

[0041] Table 2: Effect of reaction time on grafting rate

[0042] Reaction time, h

Embodiment 3

[0043] Example 3: The effect of the amount of grafting monomer on the grafting rate

[0044] Add 250 grams of corn starch, 400 grams of medical ethanol, 200 grams of de-distilled water, add 1000 ml of four-necked reaction flask equipped with reflux condenser, swell at 50°C for 30 minutes, heat up to 75°C, and add 7.5 grams of 20% mass concentration dropwise Ammonium persulfate aqueous solution and formula amount of methyl methacrylate (MMA), drip in 2 hours, react at a constant temperature for 3 hours, filter, wash the product, and determine the grafting rate after drying, and the starch grafting rate for different graft monomer dosages as follows:

[0045] Table 3: The effect of the amount of grafting monomer on the grafting rate

[0046] MMA, g

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PUM

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Abstract

A graft starch is prepared through proportionally adding starch, alcohol as disperser and water into reactor stirring, swelling, heating to 70-90 deg.C, dripping trigger and grafting monomer, stirring while reacting, cooling, filtering, washing, and drying.

Description

(1) Technical field [0001] The invention relates to a preparation method of grafted starch. (2) Background technology [0002] At present, the grafted starch synthesized is generally prepared by suspension and emulsion graft polymerization of starch dispersed in water, but the product of this method is unfavorable for grafting reaction due to the high viscosity of starch after gelatinization in water. In order to reduce the viscosity of the grafted reactant, it is convenient Stirring, generally the concentration of starch is very low, which will greatly reduce the yield of grafted starch, generate a large amount of waste water, consume a large amount of energy, and make the subsequent separation process difficult, resulting in expensive grafted starch and difficult industrial applications. (3) Contents of the invention [0003] In order to solve the above-mentioned deficiencies in the preparation of grafted starch in the prior art, the invention provides a grafted starch ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/00
Inventor 邬润德童莜莉
Owner ZHEJIANG UNIV OF TECH