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A laser modification method for preparing thermoplastic starch for biodegradable plastics

A biodegradable plastic and thermoplastic starch technology, applied in the field of starch materials, can solve the problems of poor thermoplasticity, high gelatinization temperature, product quality and safety impact, etc., and achieve easy large-scale production, increased laser absorption rate, and good thermoplastic processing sexual effect

Active Publication Date: 2019-12-03
合肥科拜尔新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In view of the high gelatinization temperature, high viscosity and poor thermoplasticity of starch, which is widely used at present, it is not conducive to the preparation of biodegradable plastics, while the conventional means of starch modification treatment have defects such as low efficiency, poor effect, harsh conditions and complicated process. , or due to the use of a large amount of chemical agents, which affects product quality and safety, the present invention proposes a laser modification method for preparing thermoplastic starch for biodegradable plastics, thereby effectively improving the thermoplasticity of modified starch, and the preparation process is simple and the cost is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A method for preparing thermoplastic starch special for biodegradable plastics by laser modification, the preparation process is as follows:

[0033] (1) Take a reaction vessel heated by a constant speed agitator and a constant temperature water bath, add starch granules and water, stir evenly to form a starch slurry, adjust the pH value to 6, then add calcium chloride, heat to 50°C, and keep stirring , to completely gelatinize the starch, then raise the temperature to 85°C, add high-temperature-resistant α-amylase, enzymatically hydrolyze at a constant temperature for 15 minutes, add dimethyl sulfoxide, and form a starch viscous liquid; the water consumption is 300% of the starch mass The amount of calcium chloride is 4% of the starch quality; the high temperature resistant α-amylase is archaeal α-amylase, and the addition is 0.1% of the starch quality; the dimethyl sulfoxide consumption is 5% of the starch quality;

[0034](2) Add the starch viscous liquid in step (1)...

Embodiment 2

[0036] A method for preparing thermoplastic starch special for biodegradable plastics by laser modification, the preparation process is as follows:

[0037] (1) Take a reaction vessel heated by a constant speed agitator and a constant temperature water bath, add starch granules and water, stir evenly to form a starch slurry, adjust the pH value to 6.5, then add calcium chloride, heat to 60°C, and keep stirring , to completely gelatinize the starch, then raise the temperature to 95°C, add high-temperature-resistant α-amylase, enzymatically hydrolyze at a constant temperature for 20 minutes, add dimethyl sulfoxide, and form a starch viscous liquid; the water consumption is 400% of the starch mass The amount of calcium chloride is 5% of the starch quality; the high temperature resistant α-amylase is eubacterial α-amylase, and the addition is 0.2% of the starch quality; the amount of dimethyl sulfoxide is 8% of the starch quality;

[0038] (2) Add the starch viscous liquid in step...

Embodiment 3

[0040] A method for preparing thermoplastic starch special for biodegradable plastics by laser modification, the preparation process is as follows:

[0041] (1) Take a reaction vessel heated by a constant speed stirrer and a constant temperature water bath, add starch granules and water, stir evenly to form a starch slurry, adjust the pH value to 6, then add calcium chloride, heat to 55°C, and keep stirring , to completely gelatinize the starch, then raise the temperature to 95°C, add high-temperature-resistant α-amylase, enzymatically hydrolyze for 25 minutes at a constant temperature, add dimethyl sulfoxide, and form a starch viscous liquid; the water consumption is 500% of the starch mass The dosage of calcium chloride is 6% of the starch quality; the high temperature resistant α-amylase is archaeal α-amylase, and the addition is 0.3% of the starch quality; the dimethyl sulfoxide consumption is 10% of the starch quality;

[0042] (2) Add the starch viscous liquid in step (1...

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Abstract

The invention provides a method for preparing thermoplastic starch special for biodegradable plastic through laser modification. The method comprises the following steps: performing enzymolysis on starch granules by high-temperature-resistant alpha-amylase, further damaging a hydrogen bond in molecules in the microstructure of the starch granules by using laser, and introducing the starch modulesinto a block polymer during monomer block polymerization to obtain starch with high thermoplasticity. The thermoplastic starch can be widely applied to preparation of biodegradable plastic. The product obtained by the method has high quality and safety, the process limit in the field of starch modification is overcome, the preparation process is simple in operation, time-saving, labor-saving and easy in large-scale production, and the practical value is extremely high.

Description

technical field [0001] The invention relates to the field of starch materials, in particular to the thermoplastic modification of starch, in particular to a laser modification method for preparing thermoplastic starch for biodegradable plastics. Background technique [0002] Starch is the product of plant photosynthesis. Many crops such as rice, wheat, corn, and potatoes have starch as the main component of their dry matter. Native starch is formed by the condensation of glucose monomers. It has a large molecular weight and abundant yield. It is an important energy substance. In practical applications, due to the nature of natural starch, such as low solubility, poor dispersibility, and inability to form a stable peptized system, it is necessary to modify starch by physical, chemical, biological or other composite methods to change some of its natural properties. Enhance its performance or introduce new features to make it more in line with the needs of production and life....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/00C08F236/04C08F212/02C08F2/46C08B30/12
CPCC08B30/12C08F2/46C08F251/00C08F236/04C08F212/02
Inventor 陈庆昝航
Owner 合肥科拜尔新材料股份有限公司
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