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Method for preparing hygroscopic film

A film and polyvinyl alcohol technology, applied in the field of moisture absorption, can solve problems such as unsatisfactory moisture absorption performance, and achieve the effect of simple operation and good moisture absorption performance

Active Publication Date: 2012-02-29
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hygroscopic properties of absorbent articles using such microporous films are unsatisfactory

Method used

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  • Method for preparing hygroscopic film

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Experimental program
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preparation example Construction

[0026] The embodiment of the invention discloses a method for preparing a hygroscopic film to improve the hygroscopic performance of the material.

[0027] The invention provides a method for preparing a hygroscopic film, comprising:

[0028] mixing polyvinyl alcohol, glycerin and water to obtain a mixture, and heating the mixture to obtain a colloid;

[0029] Add polymethacrylic acid in the colloid, fully react;

[0030] The fully reacted product is scraped into a film and dried to prepare a hygroscopic film.

[0031] Polyvinyl alcohol is a polyhydric polymer, which can easily catch the gaseous water molecules in the air to achieve the purpose of moisture absorption. For polyvinyl alcohol, it is preferable to choose polyvinyl alcohol grades with very good water solubility, such as polyvinyl alcohol 1788, but not limited thereto, which is conducive to the preparation of films;

[0032] The weight ratio of the glycerol to polyvinyl alcohol is preferably 1-5:10, more preferab...

Embodiment 1

[0067] Take 10 grams of polyvinyl alcohol 1788 and put it into a 500 ml beaker, then add 1 gram of glycerin, stir it evenly with a glass rod, then add 70 grams of water to the beaker, stir it evenly with a glass rod while adding water, and then stir it under the condition of stirring Put the beaker on the electric stove and boil for 5 minutes;

[0068] Remove the beaker from the electric stove, add 0.15 g of polymethacrylic acid to the beaker, and stir evenly with a glass rod;

[0069] Then add 0.02 gram of sodium benzoate and stir evenly with a glass rod;

[0070] After resting the beaker for 30 minutes, take out part of the colloid in the beaker and put it on a glass plate, scrape and coat the colloid on the glass plate with a triangular plate to form a film, then put the glass plate in an oven at 100°C and dry it for 4 hours. The film on the glass plate is peeled off slowly to form a polyvinyl alcohol hygroscopic film.

[0071] The film had a moisture absorption capacity ...

Embodiment 2

[0073] Take 10 grams of polyvinyl alcohol 1788 and put it into a 500 ml beaker, then add 1 gram of glycerin, stir evenly with a glass rod, then add 0.05 g of n-octanol and 70 g of water to the beaker, and stir evenly with a glass rod while adding water , and then put the beaker on the electric stove and boil for 5 minutes under the condition of stirring;

[0074] Remove the beaker from the electric stove, add 0.15 g of polymethacrylic acid to the beaker, and stir evenly with a glass rod;

[0075] Then add 0.02 gram of sodium benzoate and stir evenly with a glass rod;

[0076] Will The molecular sieve pulverization made 100 mesh molecular sieve powder;

[0077] Add 1 gram of 100-mesh molecular sieve powder into the beaker and stir evenly with a glass rod;

[0078] After resting the beaker for 30 minutes, take out part of the colloid in the beaker and put it on a glass plate, scrape and coat the colloid on the glass plate with a triangular plate to form a film, then put the ...

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Abstract

The embodiment of the invention discloses a method for preparing a hygroscopic film. Polyvinylalcohol, glycerol and water are mixed and heated to form hydrogel, wherein the polyvinylalcohol is used as a substrate. The polyvinylalcohol and the glycerol comprise a large number of hydroxide radicals which are easy to hold gaseous water molecules in air so as to fulfill the aim of absorbing moisture.The glycerol and the water are used for endowing the polyvinylalcohol with flexibility under the heating condition, so the prepared hygroscopic film has flexibility. Polymethylacrylic acid has a spacial network structure; carboxyl groups in molecular chains absorb the gaseous water molecules in the air first; and then the water molecules enter the internal spacial network; therefore, the water molecules in the air are continuously absorbed until balance. Compared with the prior art, the method has the advantages of simple and easily controllable operation; and experiment results show that theprepared hygroscopic film has good hygroscopic property.

Description

technical field [0001] The invention relates to the technical field of moisture absorption, and more specifically, relates to a method for preparing a moisture absorption film. Background technique [0002] Air humidity is a physical quantity that indicates the degree of dryness of the atmosphere, and is closely related to human life. At a given temperature, the less water vapor there is in a given volume of air, the drier the air; the more water vapor, the wetter the air. If the air humidity is too high, it will corrode and damage various metals, food, wood, etc. For example, in a humid environment, metal materials tend to form a condensed water film on the surface, resulting in electrochemical corrosion; a humid environment is suitable for the growth and reproduction of mold and pests, so food is prone to deterioration in a humid environment. Therefore, air dehumidification is a ubiquitous problem. [0003] Chinese patent CN1284850A discloses an absorbent article compri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L29/04C08L33/02C08K5/053C08J5/18
Inventor 贾超然白福臣
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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