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Water-resistant poly(vinyl alcohol) composite film and preparation method thereof

A technology of polyvinyl alcohol and composite film, which is applied in the field of film, can solve problems such as unsatisfactory gas barrier properties, and achieve the effects of high mechanical strength, good water resistance, and enhanced mechanical strength and water resistance

Inactive Publication Date: 2011-11-16
CHANGSHU JIANGSHUN PLASTIC PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process uses methanol to modify polyvinyl alcohol, which has a certain water resistance effect, but the gas barrier property is not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take 5kg of polyvinyl alcohol and 45kg of distilled water and put them into the reactor, stir in a water bath at 80°C for 5 hours to make an aqueous solution with a mass fraction of 10%; dissolve 0.5kg of polyacrylic acid in room temperature water to prepare a mass fraction of 1% 50kg of aqueous solution, and then configure polyethylene solution and polyacrylic acid solution according to the mass ratio of 3:1 to form a solution of 100kg. Add sodium hydroxide, glycerin and acrylamide to polyacrylic acid-modified polyvinyl alcohol aqueous solution, react at 50°C for 5 hours, cool down; leave at room temperature for 24 hours to remove air bubbles, cast film, gel at room temperature, and dry to water-resistant A modified polyvinyl alcohol composite film.

Embodiment 2

[0030] Put 10kg of polyvinyl alcohol and 74kg of distilled water into the reactor, stir in a water bath at 85°C for 4 hours to make an aqueous solution with a mass fraction of 12%; dissolve 1kg of polyacrylic acid in room temperature water to prepare a 2% mass fraction 50kg of aqueous solution, and then configure polyethylene solution and polyacrylic acid solution according to the mass ratio of 2:1 to form a solution of 75kg. Add sodium hydroxide, glycerin and acrylamide to polyacrylic acid-modified polyvinyl alcohol aqueous solution, react at 70°C for 3 hours, cool down; leave at room temperature for 28 hours to remove air bubbles, cast film, gelatinize at room temperature, and dry to obtain water resistance modified polyvinyl alcohol composite film.

Embodiment 3

[0032] Put 15kg of polyvinyl alcohol and 79kg of distilled water into the reactor, stir in a water bath at 90°C for 3 hours to make an aqueous solution with a mass fraction of 16%; dissolve 2kg of polyacrylic acid in room temperature water to prepare a 4% mass fraction 50kg of aqueous solution, and then configure the polyethylene solution and polyacrylic acid solution according to the mass ratio of 1:1 to form a solution of 100kg. Add potassium hydroxide, glycerin and ammonium sulfide to the polyacrylic acid-modified polyvinyl alcohol aqueous solution, react at 90°C for 2 hours, cool down; let stand at room temperature for 32 hours to remove air bubbles, pour it on the tiles to catch the film, and gel at room temperature. Dried water-resistant modified polyvinyl alcohol composite film.

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Abstract

The invention relates to a water-resistant poly(vinyl alcohol) composite film and a preparation method thereof. The water-resistant poly(vinyl alcohol) composite film comprises the following components by weight percent: 75-93% of polyacrylic-acid-modified poly(vinyl alcohol) aqueous solution, 1-10% of glycerol, 1-5% of basic catalyst and 5-10% of hydrophobic agent. The preparation method of the water-resistant poly(vinyl alcohol) composite film comprises the following steps: adding the basic catalyst, glycerol and the hydrophobic agent into the polyacrylic-acid-modified poly(vinyl alcohol) aqueous solution, reacting at the temperature of 50-100 DEG C for 1-5 hours, cooling, standing at room temperature for 24-36 hours to remove air bubbles, forming a film by virtue of blending, and drying the film to obtain the water-resistant modified poly(vinyl alcohol) composite film. The water-resistant poly(vinyl alcohol) composite film obtained in the invention has the advantages of good water resistance, easiness for biodegradation and no 'plastic pollution', and can be used in food packaging films and other packaging industries.

Description

technical field [0001] The invention relates to a film, especially a water-resistant polyvinyl alcohol composite film and a preparation method. Background technique, [0002] At present, various polymer materials, such as polystyrene and polyethylene, play a huge role in the fields of packaging industry and food industry. The amount of disposable commodities of such materials is extremely huge, and they are indispensable in people's lives. thing. However, the "white pollution" caused by these products has caused a huge negative impact on the ecological environment. Finding a biodegradable product to solve white pollution from the source has become a market concern and value. [0003] Polyvinyl alcohol film has attracted the attention of the market for its excellent degradability. This type of product is mostly used in filter membranes and general packaging films. It is resistant to oil and organic chemicals, but the water resistance of polyvinyl alcohol film is poor and ea...

Claims

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Application Information

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IPC IPC(8): C08L87/00C08K5/053C08L29/04C08L33/02
Inventor 邱玉珍
Owner CHANGSHU JIANGSHUN PLASTIC PROD
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