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Method for preparing biodegradable carboxymethyl starch/polyvinyl alcohol composite film through wet method

A technology of carboxymethyl starch and polyvinyl alcohol is applied in the field of preparation of carboxymethyl starch composite film to achieve the effects of good elasticity, prevention of dissolution shrinkage deformation, and reliable strength

Inactive Publication Date: 2017-09-05
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the current research on carboxymethyl starch and polyethanol composite membranes, the research on the preparation of composite membranes by chemical cross-linking wet method using supersaturated salt solution as a coagulation bath and related methods has not been reported after searching.

Method used

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  • Method for preparing biodegradable carboxymethyl starch/polyvinyl alcohol composite film through wet method
  • Method for preparing biodegradable carboxymethyl starch/polyvinyl alcohol composite film through wet method
  • Method for preparing biodegradable carboxymethyl starch/polyvinyl alcohol composite film through wet method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Carboxymethyl starch was prepared into a homogeneous solution with a mass concentration of 2% with distilled water;

[0031] (2) Prepare polyethylene with distilled water and alcohol to form a homogeneous solution with a mass concentration of 8%;

[0032] (3) Evenly mix 2% carboxymethyl starch solution with 8% polyvinyl alcohol aqueous solution at a mass ratio of 1:5;

[0033] (4) Spread the mixture evenly in the mold of the plexiglass utensils, and make the thickness 0.500-3.500mm. After defoaming, let it stand at room temperature for 16 hours, and then put it in 100mL supersaturated K 2 SO 4 In the solution, use 2ml of 37wt% formaldehyde solution to crosslink for 30min at pH 2.5 and temperature 85°C to obtain a composite film of carboxymethyl starch and polyvinyl alcohol, and rinse the composite film with deionized water until neutral.

[0034]The thickness of the carboxymethyl starch and polyvinyl alcohol composite film is 0.313mm, and the moisture content is 1...

Embodiment 2

[0036] (1) Carboxymethyl starch was prepared into a homogeneous solution with a mass concentration of 3% with distilled water;

[0037] (2) Prepare polyethylene with distilled water and alcohol to form a homogeneous solution with a mass concentration of 5%;

[0038] (3) Evenly mix 3% carboxymethyl starch solution with 5% polyvinyl alcohol aqueous solution at a mass ratio of 1:4;

[0039] (4) Spread the mixture evenly in the mold of the plexiglass utensils, and make the thickness 0.500~2.500mm. After defoaming, let it stand at room temperature for 24 hours, and then add it to 100mL supersaturated KNO 3 In the solution, use 3ml of 40wt% acetaldehyde solution to crosslink for 20min at pH 3 and temperature 75°C to obtain a composite film of carboxymethyl starch and polyvinyl alcohol, and rinse the composite film with deionized water until neutral.

[0040] The thickness of the carboxymethyl starch and polyvinyl alcohol composite film is 0.207mm, the water content is 13.35%, and t...

Embodiment 3

[0042] (1) Carboxymethyl starch was prepared into a homogeneous solution with a mass concentration of 2% with distilled water;

[0043] (2) Prepare polyethylene with distilled water and alcohol to form a homogeneous solution with a mass concentration of 7%;

[0044] (3) Evenly mix 3% carboxymethyl starch solution with 7% polyvinyl alcohol aqueous solution at a mass ratio of 1:8;

[0045] (4) Spread the mixture evenly in the mold of the plexiglass utensils, and make the thickness 0.800-4.100mm. 2 SO 4 In the solution, use 2ml of 30wt% glyoxal solution to crosslink for 40 minutes at pH 2 and temperature 80°C to obtain a composite film of carboxymethyl starch and polyvinyl alcohol, and rinse the composite film with deionized water until neutral.

[0046] The thickness of the carboxymethyl starch and polyvinyl alcohol composite film is 0.427mm, the water content is 24.19%, and the test calculation shows that its breaking strength is 13.387N / mm 2 , the elongation at break is 106...

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Abstract

The invention relates to a method for preparing a biodegradable carboxymethyl starch / polyvinyl alcohol composite film through a wet method. The method comprises the following steps: preparing carboxymethyl starch into a uniform solution having a mass concentration of 0.5-8%; preparing polyvinyl alcohol into a solution having a mass concentration of 2-20%; mixing the carboxymethyl starch solution with the polyvinyl alcohol solution according to a certain ratio, performing uniform stirring, then performing flow casting in a mold, performing deaeration, and placing the deaerated material at room temperature for 6-48 hours; and performing crosslinking with an aldehyde solution in an oversaturated inorganic salt solution under the condition of acid catalysis to prepare the biodegradable carboxymethyl starch / polyvinyl alcohol composite film. According to the preparation method provided by the invention, the carboxymethyl starch and water-soluble high-molecular polyvinyl alcohol composite film is prepared through chemical crosslinking in a coagulation bath; the preparation method is simple in film forming process, low in cost, low-carbon and environmentally friendly; and the prepared composite film is stable in physical and chemical properties, is biodegradable, and has sustainable development characteristics, thereby having favorable application prospects in the fields of industrial production and green packaging materials.

Description

technical field [0001] The invention belongs to the technical field of preparation of carboxymethyl starch composite films. Background technique [0002] Carboxymethyl starch (CMS) is a kind of renewable and biodegradable water-soluble polymer, which has the advantages of emulsification, dispersion, non-caking and thickening, and it is also water-soluble, emulsifying, adhesive and film-forming Excellent, simple synthesis process, low cost, low carbon and environmental protection, in line with the concept of sustainable development. CMS is widely used in textile, food, daily chemical, petrochemical, pharmaceutical, adhesive, papermaking, metallurgy and other industries. It is known as "industrial monosodium glutamate", and its new uses are still being developed, with broad application prospects. Polyvinyl alcohol (PVA) is a versatile and functional synthetic polymer material with excellent performance and wide application, which has excellent biocompatibility and biodegradab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08J3/24C08L29/04C08L3/08
Inventor 杨亮周文明张天芸王亚洲王晨飞
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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