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Degradable plastic film with good water resistance and preparation method thereof

A plastic film and performance technology, applied in the field of degradable plastic film and its preparation, can solve the problems of poor water resistance of starch plastic film, achieve the effect of improving plasticity, water resistance and film-forming performance

Inactive Publication Date: 2021-12-31
安徽乐朗环保新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the related technologies mentioned above, the inventors found that biodegradable starch plastic films have poor water resistance and cannot well meet people's needs. Therefore, it is of great significance to develop a starch plastic film with better water resistance

Method used

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  • Degradable plastic film with good water resistance and preparation method thereof
  • Degradable plastic film with good water resistance and preparation method thereof
  • Degradable plastic film with good water resistance and preparation method thereof

Examples

Experimental program
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Effect test

preparation example 1

[0063] A modified starch, the preparation steps of which are: mixing 100g of starch and 150g of glacial acetic acid at a speed of 320r / min and stirring for 3min, adding 160g of acetic anhydride at 3°C ​​while stirring within 5min, and stirring at a speed of 320r / min Continue to stir for 1min, add 8g of pre-diluted methanesulfonic acid while stirring within 10min, and after continuing to stir for 20min at a rotating speed of 350r / min, add the resulting mixed solution into deionized water 8 times the volume of the mixed solution and stir evenly. Set aside for 1 hour, filter and discard the filtrate, wash the precipitate with deionized water, vacuum-dry at 50°C to constant weight, pulverize, and pass through a 100-mesh sieve to obtain the obtained product.

[0064] Wherein, the dilution method of methanesulfonic acid is: mix 10g of methanesulfonic acid and 80g of glacial acetic acid evenly to obtain the product.

preparation example 2

[0066] A modified starch, which differs from Preparation Example 1 in that: the temperature of the added acetic anhydride is 5°C; after adding methanesulfonic acid, the stirring is continued for 25 minutes, and the resulting mixture is added with deionized Stir well in water and let it stand for 1.5 hours; wash and precipitate and crush through a 110-mesh sieve.

preparation example 3

[0068] A modified starch, which differs from Preparation Example 1 in that: the temperature of the added acetic anhydride is 8°C; after adding methanesulfonic acid, the stirring is continued for 30 minutes, and the resulting mixture is added with deionized water 10 times the volume of the mixture. Stir well in water and let it stand for 2 hours; after washing the precipitate, crush it through a 120-mesh sieve.

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Abstract

The invention relates to the field of plastic films, and particularly discloses a degradable plastic film with good water resistance and a preparation method thereof. The degradable plastic film with good water resistance comprises the following components: 30-50 parts of modified starch; 20-30 parts of polyvinyl alcohol; 5-10 parts of an inorganic powder filler; 4-6 parts of a cross-linking agent; 4-6 parts of urea; 7-12 parts of glycerin; and 200-220 parts of water; the preparation method of the modified starch comprises the following steps: mixing starch with glacial acetic acid, adding acetic anhydride, continuously stirring, adding methanesulfonic acid diluted in advance, stirring, adding the obtained mixed solution into deionized water, uniformly stirring, standing, filtering, removing filtrate, washing with deionized water, precipitating, drying and crushing to obtain the modified starch. The plastic film disclosed by the invention has relatively good water resistance.

Description

technical field [0001] The application relates to the technical field of plastic films, more specifically, it relates to a degradable plastic film with good water resistance and a preparation method thereof. Background technique [0002] Plastic film is a film made of polyvinyl chloride, polyethylene, polypropylene, polystyrene and other resins. It is an indispensable item in people's daily life and has been widely used in food, medicine, chemical industry, agriculture, etc. and other fields. In recent years, "white pollution" has become more and more serious, which has attracted widespread attention from all over the world. Countries around the world have successively issued relevant laws and regulations restricting or prohibiting the use of non-degradable plastic packaging. Therefore, degradable plastic films have been widely promoted. In particular, starch plastic has its potential advantages as a completely degradable plastic: starch has complete biodegradability in var...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L3/06C08L29/04C08K3/34C08K7/26C08K5/07C08K5/21C08K5/053C08J5/18C08B31/04
CPCC08J5/18C08B31/04C08J2303/06C08J2429/04C08K3/34C08K3/346C08K7/26C08K5/07C08K5/21C08K5/053
Inventor 方港
Owner 安徽乐朗环保新材料有限公司