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High humidity resisting modified starch-base biodegradable film and preparation method thereof

A degradable film and starch-based technology, which is applied in the field of high-humidity resistant modified starch-based biodegradable film and its preparation, can solve the problems of mechanical property degradation and achieve good degradation performance, good biological safety, and good mechanical properties. Effect

Inactive Publication Date: 2017-05-31
NANJING UNIV OF FINANCE & ECONOMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem that the mechanical properties of the existing starch-based biodegradable films decrease under high humidity conditions, the present invention provides a degradable film with a new formula, which uses enzymatically modified starch, polyvinyl alcohol, water-based bentonite and glycerin to blend, No other chemical crosslinking agent is introduced during the process, and the preparation process is simple. While meeting the requirements of biodegradability, it also meets the requirements of good mechanical properties under high humidity conditions, especially the elongation at break. Improved film sensitivity to ambient humidity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: 10 g of cornstarch was added into 190 mL of deionized water, and stirred at 90° C. and 720 rpm for 30 min. Cool the starch aqueous solution after gelatinization to 55° C., add 1 g of α-amylase enzyme solution, and hydrolyze for 20 minutes. Stir the corn paste at 100°C and 720rpm for 30min to inactivate the enzyme. Dissolve 5g of PVA in 95mL of deionized water, stir the corn paste after deactivation, PVA solution, 1.5g of LRD (Laponite RD) and 4g of glycerin at 95°C and 960rpm for 30min to obtain a uniform and viscous blend; Vacuum at 50-70°C, then cast in a round PE tray with a flat bottom surface and a diameter of 13cm, let the blend flow naturally, control the quality of the blend at 40g-50g, and dry at a temperature of 35°C for 36 hours. The above-mentioned degradable film. The average film thickness is 0.7mm. After equilibrating at a humidity of 50% for 72 hours, the elongation at break is 423.4%, and after balancing at a humidity of 75% for 72 hours, t...

Embodiment 2

[0027] Example 2: 90 g of mixed powder of rice starch and wheat starch was added into 360 mL of deionized water, and stirred at 80° C. and 720 rpm for 30 min. Cool the starch aqueous solution after gelatinization to 55°C, add 0.09g of α-amylase and isoamylase mixed enzyme solution, and hydrolyze for 120min. Stir the starch paste at 100°C and 720rpm for 30min to inactivate the enzyme. Dissolve 90g of PVA in 360mL of deionized water, stir the starch paste, PVA solution, 40g of LRD (Laponite RD) and 30g of glycerol at 85°C and 960rpm for 45min to obtain a uniform and viscous blend; Vacuum at 50°C, then pour it into a round PE tray with a flat bottom and a diameter of 13cm, so that the blend liquid flows naturally, the quality of the blend liquid is controlled at 40g-50g, and dried at 40°C for 24 hours to obtain the degradable film. The average film thickness is 0.8 mm, and the elongation at break is 455.6% after balancing at a humidity of 50% for 72 hours, and after balancing a...

Embodiment 3

[0028] Example 3: 50 g of mixed powder of wheat starch, potato starch and tapioca starch was added into 450 mL of deionized water, and stirred at 90° C. and 720 rpm for 60 min. Cool the starch aqueous solution after gelatinization to 55°C, add 2.5g pullulanase enzyme solution, and hydrolyze for 240min. Stir the starch paste at 100°C and 720rpm for 30min to inactivate the enzyme. Dissolve 50g of PVA in 450mL of deionized water, stir the starch paste, PVA solution, 10g of LRD (Laponite RD) and 15g of glycerol at 90°C and 960rpm for 40min to obtain a uniform and viscous blend; Vacuum at 70°C, and then cast in a round PE tray with a flat bottom and a diameter of 13cm, so that the blend liquid flows naturally, and the quality of the blend liquid is controlled at 40g-50g, and dried at a temperature of 50°C for 24h to obtain the said can degraded film. The average film thickness is 0.7mm. After balancing at a humidity of 50% for 72 hours, the elongation at break is 210.3%, and afte...

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Abstract

The invention provides a high humidity resisting modified starch-base biodegradable film and a preparation method thereof. The invention aims to solve the problem of poor mechanical property of the present starch-base biodegradable film under a high humidity environment. A nanometer biodegradable film is composed of starch, PVA, water-based bentonite and glycerin. The preparation method comprises the following steps: pasting starch, and then performing moderate enzymolysis modification on the starch; mixing with a PVA aqueous solution, a water-based bentonite dispersion liquid and glycerin; and cooling and then pouring into a mold, thereby obtaining the high humidity resisting modified starch-base biodegradable film. The biodegradable film provided by the invention is simple in preparation process; under the condition of high humidity, the biodegradable film has an excellent stretching property; and the cost is guaranteed and meanwhile the application scope can be expanded.

Description

technical field [0001] The invention relates to a high-humidity-resistant modified starch-based biodegradable film and a preparation method thereof, and relates to the field of biodegradable materials and its preparation. Background technique [0002] Starch has the advantages of being natural, widely sourced, renewable, non-polluting, low-cost, and biodegradable. Starch-based bioplastic films are one of the fastest-growing biodegradable plastics. However, starch films are very sensitive to environmental humidity due to their inherent poor mechanical properties, which cannot meet the application requirements in most cases. Polyvinyl alcohol (PVA) is a chemically synthesized biodegradable polymer with high antistatic properties, wear resistance and corrosion resistance, excellent mechanical properties, etc., and has good compatibility with starch. The blending of polyvinyl alcohol and starch is usually used to improve the mechanical properties of starch-based materials. How...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L3/02C08L29/04C08K7/00C08K5/053C08J5/18
CPCC08L3/02C08J5/18C08J2303/02C08J2403/02C08J2429/04C08K2201/011C08L2201/06C08L2203/16C08L2205/025C08L2205/03C08L2205/035C08L2312/00C08L29/04C08K7/00C08K5/053C08K3/34
Inventor 汤晓智于晨卢玥高成成沈新春周剑敏
Owner NANJING UNIV OF FINANCE & ECONOMICS
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