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Preparation method of starch-base biodegradation material

A biodegradable material, starch-based technology, applied in the field of preparation of starch-based biodegradable materials, can solve the problems of failing to improve the film-forming performance of starch, affecting the promotion and use of products, and limiting the scope of application, etc., to achieve low cost and low performance Good, stable process effect

Active Publication Date: 2010-05-26
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, this product uses a gelling accelerator to promote the destruction of the starch crystalline granule structure so that it has thermoplastic processability, but this product fails to improve the film-forming properties of starch, resulting in a decrease in mechanical properties under high starch content, which limits range of application
In addition, the starch has not been hydrophobized and modified, which affects the popularization and use of the product

Method used

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  • Preparation method of starch-base biodegradation material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Add water and 0.08kg α-amylase to 80kg tapioca starch, put it into a high-speed mixing mixer, heat up to 80°C, and stir for 5 minutes to gelatinize. Wherein, the mixing ratio of starch and water is starch:water=1:0.5 in parts by weight.

[0023] 2) Add 2.7 kg of acetic anhydride to the product of step 1), and stir and react for 25 minutes at a stirring speed of 500 rpm.

[0024] 3) Add 8 kg of sorbitol to the product in step 2), and continue stirring for 15 minutes.

[0025] 4) Add 4 kg of aluminate coupling agent to the product in step 3), and continue stirring for 5 minutes to obtain starch gel.

[0026] 5) Add 5 kg of polylactic acid to the product of step 4), mix and stir for 6 minutes, discharge the material after mixing evenly, and send it to a co-rotating twin-screw extruder for extrusion and granulation to obtain a starch-based biodegradable material. Among them, the screw length-to-diameter ratio of the co-rotating twin-screw extruder is 48:1, the screw sp...

Embodiment 2

[0029] 1) Add water and 0.3kg of α-amylase to 82kg of cornstarch, put it into a high-speed mixer, raise the temperature to 120°C, and stir for 8 minutes to gelatinize. Wherein, the mixing ratio of starch and water is starch:water=1:1 in parts by weight.

[0030] 2) Add 1.4 kg of acetic acid to the product of step 1), and stir for 8 minutes at a stirring speed of 900 rpm.

[0031] 3) Add 5kg polyethylene glycol and 4kg propylene glycol to the product of step 2), and continue to stir for 30 minutes.

[0032] 4) Add 3 kg of oxidized polyethylene wax to the product in step 3), and continue stirring for 5 minutes to obtain starch gel.

[0033] 5) Add 8 kg of polybutylene succinate to the product in step 4), mix and stir for 12 minutes, discharge the material after mixing evenly, and send it to a co-rotating twin-screw extruder to extrude and granulate to obtain starch-based biodegradable Material. Among them, the screw length-to-diameter ratio of the co-rotating twin-screw extru...

Embodiment 3

[0036] 1) Add water and 0.1kg of α-amylase to 85kg of sweet potato starch, put it into a high-speed mixing mixer, heat up to 100°C, and stir for 10 minutes to gelatinize. Wherein, the mixing ratio of starch and water is starch:water=1:0.4 in parts by weight.

[0037] 2) Add 2.0 kg of vinyl acetate to the product of step 1), and stir and react for 10 minutes at a stirring speed of 800 rpm.

[0038] 3) Add 12kg of glycerol to the product in step 2), and continue to stir for 20 minutes.

[0039] 4) Add 5kg of white oil to the product in step 3), and continue stirring for 10 minutes to obtain starch gel.

[0040] 5) Add 7kg of poly-hydroxyvalerate to the product of step 4), mix and stir for 5 minutes, discharge the material after mixing evenly, and send it to a co-rotating twin-screw extruder for extrusion and granulation to obtain a starch-based biodegradable material. Among them, the screw length-to-diameter ratio of the co-rotating twin-screw extruder is 48:1, the screw speed...

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Abstract

The invention provides a preparation method of a starch-base biodegradation material. The starch-base biodegradation material is characterized by comprising the following raw materials in parts by weight: 70-85 parts of starch, 0.05-0.5 part of amylase, 1-11 parts of acetylating agent, 4-11 parts of plasticiser, 3-6 parts of hydrophobic modifier and 5-20 parts of biomass polymer. The preparation method comprises the following step of: (1) adding water into the starch, and adding amylase, and stirring for gelatinization; (2) adding the acetylating agent into the product in step (1), and stirring for reaction; (3) adding the plasticiser into the product in step (2), and to continuously stirring; (4) adding the hydrophobic modifier into the product in step (3), and continuously stirring to obtain starch gel; (5) adding the biomass polymer into the starch gel in the step (4), uniformly mixing, and delivering the uniform mixture into a twin-screw extruder to extrude and granulate. The invention has the advantages of simple operation, stable technology, low cost and high efficiency, and the obtained product has the advantage of good film forming property, mechanical property, water resistance property and degradation property.

Description

technical field [0001] The invention relates to a preparation method of a biodegradable material. In particular, it relates to a preparation method of a starch-based biodegradable material. Background technique [0002] Since the beginning of the 21st century, protecting the earth's environment, building a resource-recycling society, and taking the path of sustainable development have become a hot topic and an urgent task in the world. The life cycle of biodegradable materials is sustainable, and it is a typical material with low environmental load. Therefore, biodegradable materials have become a hot spot in global research and development. By blending starch with biodegradable polymers, low-cost fully biodegradable starch-based materials can be obtained. However, the currently developed starch-based biodegradable materials have some defects in quality and performance, so their applications are limited. The specific performance is that the starch content in degraded mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L3/06C08L67/04C08B30/12C08B31/04C08L67/02
Inventor 陈庆曾军堂邱雄
Owner CHENDU NEW KELI CHEM SCI CO LTD
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