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Total biodegradable film and preparation method

A biodegradable and thin-film technology, applied in the direction of coating, etc., can solve the problems of insufficient moisture resistance, weather resistance, water resistance, poor moisture resistance, and unfavorable biodegradation, and achieve the effect of increasing the contact area

Inactive Publication Date: 2005-10-26
湖北誉笛环保科技实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But Mater-Bi also has a fatal weakness. Its moisture resistance, weather resistance, and water resistance are not enough, which seriously limits its scope of use.
There are also some commercially available film products containing about 60% of starch and about 15% of polyvinyl alcohol (PVA). The viscosity after melting is extremely high, and it is difficult to achieve the melt index and corresponding production speed of polyethylene film under the same conditions in film-forming production, which is a serious limitation for the industrial production of this type of product.
Therefore, in order to overcome the defect of poor moisture resistance of such products, people often coat polyvinyl chloride sol on the polyvinyl alcohol-starch film, and the introduction of polyvinyl chloride is extremely unfavorable to biodegradation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take 150 parts of multi-system polymers by weight, including 83 parts of the first polymer polyvinyl alcohol (PVA), 17 parts of the second polymer ethylene-acrylic acid copolymer (EAA), and 17 parts of the third polymer Malay Anhydride and ethylene glycol polymerized fat 50 parts (maleic anhydride and ethylene glycol each account for 25 parts), the ratio of the three polymers is roughly 5:1:3. Then take 650 parts of cornstarch, put them together in a mixer, and stir them evenly at a temperature of 70-80°C. Then take 20 parts of plasticizer glycerin, 180 parts of polyethylene glycol, and 2 parts of defoaming agent tributyl phosphate, and add them to the mixer under stirring state while maintaining a temperature of 70-80°C. Mix well with starch and multi-system polymers.

[0022] Continue to maintain the temperature condition of 70 ~ 80 ℃, after 5 ~ 8 minutes of stirring in the mixer, the materials are mixed into micelles, and then after 2 to 5 minutes of high-speed crus...

Embodiment 2

[0026] Get 200 parts of multi-system polymers by weight, wherein the first polymer polyvinyl alcohol (PVA) 110 parts, the second polymer ethylene-acrylic acid copolymer (EAA) 8 parts, ethylene-ethylene acid copolymer ( EVOH) 10 parts, the third polymer maleic anhydride and ethylene glycol polymerized fat 72 parts (maleic anhydride accounts for 44 parts, ethylene glycol accounts for 28 parts), the ratio of the three polymers is roughly 6:1: 4. Then take 750 parts of konjac starch, put them together in a mixer, and stir them evenly at a temperature of 70-80°C. Then take 180 parts of plasticizer propylene glycol and 2 parts of defoamer polyacrylate, and add them to the mixer under stirring under the condition of maintaining the temperature of 70-80 ° C, and mix them with starch and multi-system polymer uniform.

[0027]Continue to maintain the temperature condition of 70 ~ 80 ℃, after 6 ~ 7 minutes of stirring in the mixer, the materials are mixed into micelles, and then after ...

Embodiment 3

[0031] Take 180 parts of multi-system polymers by weight, including 115 parts of the first polymer polyvinyl alcohol (PVA), 15 parts of the second polymer ethylene-vinyl acetate copolymer (EVA), and 15 parts of the third polymer oxalic acid 50 parts of lipid polymerized with ethylene glycol (oxalic acid and ethylene glycol each account for 25 parts), and the ratio of the three polymers is roughly 7:1:3. Then take 890 parts of pre-gelatinized modified starch, put them together in a mixer, and stir them evenly at a temperature of 70-80°C. Then take 230 parts of plasticizer ethylene glycol and 1 part of defoamer silicone oil, and add them to the mixer under stirring under the condition of maintaining the temperature of 70-80 ° C, and mix them with starch and multi-system polymer uniform.

[0032] Continue to maintain the temperature condition of 70 ~ 80 ℃, after 5 ~ 6 minutes of stirring in the mixer, the materials are mixed into micelles, and then after 2 to 4 minutes of high-s...

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PUM

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Abstract

The present invention discloses a film which can be completely bio-degraded and its preparation method. Said film is made up by using (wt%) 5-20% of multicomponent system polymer, 60-80% of starch, 5-20% of plasticizer and 0.05-0.2% of defoaming agent and adopting the processes of mixing reaction, preplasticizing treatment, extruding granulation and blow-moulding to form film. Besides, sand invention also provides the concrete composition of every polymer of three polymers of the above-mentioned multicomponent system polymer.

Description

technical field [0001] The invention relates to a biodegradable film, in particular to a fully biodegradable film blown into a film by a common blow molding machine and a preparation method thereof. Background technique [0002] While the chemical plastic film is convenient for people to use, it also forms a recognized white pollution that is difficult to degrade. In order to solve the pollution problem caused by chemical plastic films, people have been working hard to find effective replacement products. At present, in the process of searching for alternative products, the following three categories are more prominent: the first category is to introduce biodegradable starch and organic acids or esters into the usual polyethylene film, hoping to promote the oxidation of the film through oxidation. The purpose of decomposition is to finally decompose organic acids or esters into carbon dioxide and water through the oxidation process of photodegradation, bio...

Claims

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Application Information

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IPC IPC(8): C08L3/02
Inventor 方墉
Owner 湖北誉笛环保科技实业有限公司
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