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Preparation method of degradable starch material

A technology of starch degradation and starch milk, which is applied in the field of preparation of starch degradation materials, can solve the problems of poor mechanical properties and low water resistance, and achieve the effects of high viscosity stability, good initial viscosity, and reduced viscosity

Inactive Publication Date: 2019-01-29
黄旭东
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Technical problem to be solved by the present invention: Aiming at the problems of low water resistance and poor mechanical properties of existing starch materials, a method for preparing starch degradation materials is provided

Method used

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  • Preparation method of degradable starch material

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Effect test

example 1

[0022] Mix starch and deionized water at a mass ratio of 2:5, stir ultrasonically for 10 minutes, adjust the pH to 3 with hydrochloric acid with a mass fraction of 3%, and obtain a starch emulsion. In parts by weight, weigh 50 parts of starch emulsion, 0.1 1 part of copper sulfate, 1 part of composite oxidizing agent, 0.2 parts of 10% sodium sulfite solution by mass fraction, mix starch emulsion, copper sulfate and composite oxidizing agent, put them into a magnet, and place them under magnetic stirring in a water bath at 45°C for 1 hour to obtain a reaction solution, drop Add a 10% sodium sulfite solution by mass fraction, let stand and cool to room temperature to obtain a suspension, filter the filter residue with suction, wash the filter residue once with deionized water, dry it in an oven at 50°C to constant weight, and cool to room temperature. Grind to get oxidized starch; by weight, take respectively 30 parts of oxidized starch, 20 parts of polylactic acid, 1 part of pla...

example 2

[0024] Mix starch and deionized water at a mass ratio of 2:5, stir ultrasonically for 15 minutes, adjust the pH to 4 with hydrochloric acid with a mass fraction of 3%, and obtain a starch emulsion. In parts by weight, weigh 55 parts of starch emulsion, 0.2 1 part of copper sulfate, 2 parts of composite oxidizing agent, 0.3 parts of 10% sodium sulfite solution by mass fraction, mix starch emulsion, copper sulfate and composite oxidizing agent, put in a magnet, and magnetically stir in a water bath at 50°C for 1 hour to obtain a reaction solution, drop Add a 10% sodium sulfite solution by mass fraction, let stand and cool to room temperature to obtain a suspension, filter with suction to obtain a filter residue, wash the filter residue twice with deionized water, dry it in an oven at 55°C to constant weight, and cool to room temperature. Grind to get oxidized starch; in parts by weight, take 37 parts of oxidized starch, 23 parts of polylactic acid, 4 parts of plasticizer, 0.5 par...

example 3

[0026]Mix starch and deionized water at a mass ratio of 2:5, stir ultrasonically for 20 minutes, adjust the pH to 5 with hydrochloric acid with a mass fraction of 3%, and obtain a starch emulsion. In parts by weight, weigh 60 parts of starch emulsion, 0.3 1 part of copper sulfate, 3 parts of composite oxidizing agent, 0.5 parts of 10% sodium sulfite solution by mass fraction, mix starch emulsion, copper sulfate and composite oxidizing agent, put them into a magnet, and place them in a water bath at 55°C for 2 hours to obtain a reaction solution, drop Add a 10% sodium sulfite solution by mass fraction, let stand and cool to room temperature to obtain a suspension, filter the filter residue with suction, wash the filter residue 3 times with deionized water, dry it in an oven at 60°C to constant weight, and cool to room temperature. Grind to get oxidized starch; in parts by weight, take 44 parts of oxidized starch, 26 parts of polylactic acid, 8 parts of plasticizer, 0.6 part of i...

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Abstract

The invention relates to a preparation method of a degradable starch material, and belongs to the technical field of degradable materials. According to the invention, a composite oxidant prepared by mixing hydrogen peroxide and potassium persulfate is used to oxidize starch to prepare oxidized starch, and the oxidized starch has the advantages of good liquidity, high viscosity stability, high permeability, good binding force and the like, wherein the selected composite oxidant prepared by mixing the hydrogen peroxide and the potassium persulfate has good stability, an oxidation reaction is thorough, the amount of residual oxidant is small, initial viscosity is good, the drying speed is high, and pollution is low. According to the invention, the degradable starch material is prepared by taking the oxidized starch and polylactic acid as raw materials. After the starch is subjected to oxidation treatment, dispersibility and interaction among molecules are reduced, a defect that the mechanical properties of the starch are poor is overcome, dependence between the oxidized starch and the polylactic acid is enhanced relative to the whole composite system, and bonding force between the oxidized starch and the polylactic acid material is improved, so that tensile strength of the degradable starch material is greatly improved.

Description

technical field [0001] The invention relates to a preparation method of a starch degradable material, belonging to the technical field of degradable materials. Background technique [0002] Starch is the most abundant renewable resource biosynthesized and is an inexhaustible organic raw material. Starch has the advantages of wide sources, low price and easy biodegradation. It is widely used in the fields of food, papermaking, textile, adhesives and sugar production. With the gradual depletion of non-renewable resources and to meet the needs of environmental protection, as a renewable The development of resource starch is attracting more and more attention. However, starch also has some disadvantages and cannot be directly processed and applied, and it needs to be modified first. At present, modified starches are mostly processed by chemical methods to enhance certain functions or form new characteristics by improving the molecular structure of starch. However, chemical me...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L3/10C08L67/04
CPCC08J5/18C08J2303/10C08J2467/04
Inventor 黄旭东张鑫骆兵建
Owner 黄旭东
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