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Preparation method of modified starch-polyvinyl alcohol-based composite plastic film

A polyvinyl alcohol-based, plastic film technology, applied in flat products, applications, household appliances, etc., can solve the problems of poor mechanical properties of full-starch thermoplastics, unable to meet application requirements, and only water-soluble films, etc., to achieve low cost , improve moisture resistance and mechanical properties, and the effect of simple preparation method

Active Publication Date: 2010-12-15
DUNHUANG XIYU MINING & CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, full starch thermoplastics have poor mechanical properties and are very sensitive to environmental humidity, which cannot meet the application requirements in most cases
Especially the PVA / starch film made after PVA (polyvinyl alcohol) is added to starch has poorer water resistance
Although there are relatively mature PVA film production technologies, products and markets at home and abroad, they are only limited to water-soluble film products.

Method used

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  • Preparation method of modified starch-polyvinyl alcohol-based composite plastic film

Examples

Experimental program
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Effect test

Embodiment 1

[0038] (1) Preparation of modified starch (DAS)

[0039] Completely dissolve 10g of sodium periodate in 100mL of distilled water at 20°C, add 30g of cornstarch, adjust the solution to be neutral, stir at 35°C for 4 hours to obtain starch slurry; The modified starch is obtained until the water is substantially free of iodate.

[0040] (2) Preparation of biodegradable plastic film

[0041] Dissolve 25g of modified starch in 80mL of distilled water, add 7.5g of plasticizer ethylene glycol, gelatinize at 90°C for 0.5h, then add 3g of compounding agent I (including 1g of poly-L lactic acid, 1g of polyvinyl alcohol, Polycaprolactone 1g), fully stirred at 90°C for 0.5h to mix the components evenly, then added 3g of compounding agent II (1g of jute cellulose, 1g of soybean protein, and 1g of loess), and continued to stir for 0.5h After cooling, pour the mold. Put it into an oven, control the temperature and dry it at 50°C for about 48 hours, and equilibrate it at a humidity of 40% ...

Embodiment 2

[0047] (1) Preparation of modified starch (DAS)

[0048] Completely dissolve 10g of hydrogen peroxide in 100mL of distilled water at 20°C, add 30g of cornstarch, adjust the solution to be neutral, stir at 35°C for 4 hours to obtain starch slurry; Modified starch is obtained without hydrogen peroxide.

[0049](2) Preparation of biodegradable plastic film

[0050] Dissolve 25g of modified starch in 80mL of distilled water, add 7.5g of plasticizer formaldehyde, gelatinize at 90°C for 0.5h, then add 3g of compounding agent I (0.5g of poly-D lactic acid, 1g of polyvinyl alcohol, polyethylene glycol lactone 1.5g), fully stirred at 90°C for 0.5h to mix the components evenly, then added 3g of compound II (including 1g of cotton cellulose, 1g of feather protein, and 1g of palygorskite clay), and continued stirring Cool after 0.5h and pour the mold. Put it in an oven, control the temperature and dry it at 50°C for about 48 hours, and then equilibrate it at a humidity of 45% for 5 day...

Embodiment 3

[0056] (1) Preparation of modified starch (DAS)

[0057] Completely dissolve 10g of potassium permanganate in 100mL of distilled water at 20°C, add 30g of cornstarch, adjust the solution to be neutral, stir at 35°C for 4 hours to obtain starch slurry; filter with suction and wash with distilled water for 3 to 5 times. Until the water basically does not contain potassium permanganate, modified starch is obtained.

[0058] (2) Preparation of biodegradable plastic film

[0059] Dissolve 25g of modified starch in 80mL of distilled water, add 7.5g of plasticizer dimethyl sulfoxide, gelatinize at 90°C for 0.5h, then add 3g of compound I (including 0.5g of poly D, L lactic acid, poly Vinyl alcohol 1g, polycaprolactone 1.5g), fully stirred at 90°C for 0.5h to mix the components evenly, and then added 3g of compounding agent II (including 0.5g of flax cellulose, 1g of milk protein, montmorillonite Soil 1.5g), continue to stir for 0.5h, cool down, pour into the mold. Put it in an ove...

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Abstract

The invention provides a preparation method of a modified starch-polyvinyl alcohol-based composite plastic film, belonging to the technical field of high polymer materials. The preparation method comprises the following steps of: uniquely oxidizing carbon atoms C2 and C3 in a glucose unit of starch into an aldehyde group under the action of a strong oxidant; breaking C2-C3 chains to obtain dialdehyde modified starch; and then blending the dialdehyde modified starch with polyvinyl alcohol (PVA), plasticizer, cellulose and the like which are used for synthesizing biodegradation type polymers to obtain the starch-based plastic film with favorable mechanical property, water resistance and degradation. The invention provides an extensive application prospect for the starch-based plastic film.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and relates to a method for preparing a starch-based plastic film, in particular to a method for preparing a modified starch-polyvinyl alcohol-based composite plastic film. Background technique [0002] Starch is a kind of natural polymer material with wide sources, cheap price and biodegradability, and plays an important role in the field of biodegradable materials. As a renewable resource, starch was initially used as a cost-reducing inert extender and flame retardant in polyurethane formulations. However, due to the oil crisis and a series of environmental problems, its use in the field of degradable materials has attracted widespread attention today, which also indicates a broad prospect for starch-based biodegradable plastics. However, full-starch thermoplastics have poor mechanical properties and are very sensitive to ambient humidity, which cannot meet the application requiremen...

Claims

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Application Information

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IPC IPC(8): C08L3/10C08L67/04C08L29/04C08L1/02C08L89/00C08K13/02C08K3/34C08B31/18B29D7/01
Inventor 雷自强武战翠张哲王忠超许剑常迎路德待
Owner DUNHUANG XIYU MINING & CHEM
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