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Method for preparing hydrophobic starch

A kind of hydrophobic starch and starch technology, which is applied in the field of wet preparation of hydrophobic starch, can solve the problems of restricting starch application, difficulty in infiltration and dispersion, etc., and achieve the effects of easy realization of large-scale industrial production, uniform modification and high reaction efficiency

Inactive Publication Date: 2009-06-17
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, starch molecules contain a large number of hydroxyl groups, making it difficult to infiltrate and disperse in organic phases, which limits the application of starch in some fields.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Adjust the dry starch with water to make starch milk with a mass concentration of 40%, place it in a reaction kettle, and stir; raise the temperature of the starch milk to 50°C, add 5% of the dry starch mass in anhydrous sodium sulfate, and keep the temperature for 5 minutes When the pH value of the emulsion is adjusted to 9.0 with a 5% sodium hydroxide aqueous solution with a mass concentration, start to slowly add 10% hexamethyldisilazane of the dry starch quality, and use 10% mass concentration hydrochloric acid or 5% mass concentration Concentrated sodium hydroxide aqueous solution keeps the pH value of the emulsion constant, and reacts for 4 hours; after the reaction is completed, the pH value of the emulsion is adjusted to 6.0 with 10% mass concentration hydrochloric acid, and the starch milk is filtered, washed, dried, and pulverized to obtain the product.

Embodiment 2

[0019] Adjust the dry starch with water to make starch milk with a mass concentration of 35%, place it in a reaction kettle, and stir; raise the temperature of the starch milk to 60°C, add 8% of the dry starch mass in anhydrous sodium sulfate, and keep the temperature for 10 minutes When the pH value of the emulsion is adjusted to 10.0 with a 5% sodium hydroxide aqueous solution with a mass concentration, start to slowly add 15% hexamethyldisilazane of the dry starch quality, and use 5% mass concentration hydrochloric acid or 5% mass concentration The concentrated sodium hydroxide aqueous solution keeps the pH value of the emulsion constant, and reacts for 6 hours; after the reaction, the pH value of the emulsion is adjusted to 6.5 with 5% mass concentration hydrochloric acid, and the starch milk is filtered, washed, dried, and pulverized to obtain the product.

Embodiment 3

[0021] Prepare dry starch with 85% mass ethanol aqueous solution to make starch milk with a mass concentration of 35%, place it in a reaction kettle, and stir; raise the temperature of starch milk to 70°C, and add 3% anhydrous sulfuric acid to the mass of dry starch Sodium, keep the temperature for 10 minutes; when the pH value of the emulsion is adjusted to 10.0 with a 4% sodium hydroxide aqueous solution, start to slowly add 15% hexamethyldisilazane of the dry starch mass, and use 10% mass concentration Hydrochloric acid or 5% mass concentration sodium hydroxide aqueous solution keeps the pH value of the emulsion constant, and reacts for 6 hours; get the product.

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Abstract

The invention provides a hydrophobic starch preparation method, relates to a preparation method for the hydrophobic starch, in particular to a wet preparation method for the hydrophobic starch. The invention aims to provide the preparation method for the hydrophobic starch. The preparation method comprises the following steps: brewing overcooked starch into starch milk with the mass concentration of between 25 and 40 percent by water or 80-95 mass percent ethanol aqueous solution, placing and stirring the starch milk in a reaction kettle; adding anhydrous sodium sulfate accounting for 3 to 15 mass percent of the overcooked starch, and keeping a constant temperature for 5 to 15 minutes; regulating the pH value of the emulsion to 8.5 to 11.0 by a 3 to 6 percent sodium hydroxide aqueous solution, starting to add hexamethyldisilazane accounting for 5 to 15 mass percent of the overcooked starch, keeping the constant pH value of the emulsion by 5 to 10 mass percent hydrochloric acid or the 3 to 6 mass percent sodium hydroxide aqueous solution, and carrying out the reaction for 2 to 15 hours; and after the reaction is finished, regulating the pH value of the emulsion to 6.0 to 7.0 by 5 to 10 mass percent hydrochloric acid, and obtaining the product after filtrating, washing, drying and crushing the starch milk.

Description

Technical field: [0001] The invention relates to a preparation method of hydrophobic starch, in particular to the preparation of hydrophobic starch by a wet method. Background technique: [0002] Starch is a polysaccharide carbohydrate, which is extremely abundant in nature and can be widely used in food, feed, casting, medicine and other fields. However, starch molecules contain a large number of hydroxyl groups, making it difficult to infiltrate and disperse in organic phases, which limits the application of starch in some fields. Therefore, surface modification must be carried out to improve its compatibility and binding force with organisms. [0003] After starch granules are modified, the hydrophilicity of the surface can be changed to hydrophobicity, and a series of properties such as adsorption, wetting, and dispersion will be significantly improved, which can meet different application requirements, such as detergents, emulsifiers and Resin additives, etc. Invent...

Claims

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Application Information

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IPC IPC(8): C08B31/00
Inventor 唐洪波马冰洁李艳平孙敏
Owner SHENYANG POLYTECHNIC UNIV
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