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Mineral-filled degradable polyvinyl alcohol fresh-keeping film and preparation method thereof

A technology of polyvinyl alcohol and plastic wrap, applied to flexible coverings, packaging, wrapping paper, etc., can solve the problems of insufficient mechanical properties and water resistance, and achieve the effects of improving mechanical properties, reducing moisture absorption rate, and good dispersibility

Inactive Publication Date: 2018-05-18
DANGTU COUNTY RUILONG FRUIT TREE PLANTING SPECIALIZED COOP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are insufficient mechanical properties and water resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0021] A kind of mineral-filled degradable polyvinyl alcohol preservative film is made from the raw materials of following parts by weight (g):

[0022] Polyvinyl alcohol 43, bentonite 14, citric acid 11, glycerin 4, gluconic acid 7, carbon black 9, polyether amine 10, nano silicon dioxide 5, sodium dodecylbenzene sulfonate 3, potassium hydroxide 6, oxidation Graphene 7, carbon nanotube 8, pentylene glycol 6, acetic acid 5, kaolin 6, diatomaceous earth 5, paraffin 4, KH550 3, ethanol, H 2 SO 4 , Distilled water.

[0023] A preparation method of a mineral-filled degradable polyvinyl alcohol preservative film, characterized in that, the steps are as follows:

[0024] a. Mix bentonite and glycerin, add distilled water at 1:20, stir for 2 hours to disperse evenly, adjust pH to 7-8, add citric acid and ethanol at 1:10, heat up to 70-80°C constant temperature water bath, slowly add gluconic acid dropwise, Stir and react for 3 hours, filter with suction, wash with water and alcoho...

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PUM

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Abstract

The invention discloses a mineral-filled degradable polyvinyl alcohol fresh-keeping film and a preparation process thereof. The fresh-keeping film is characterized in that polyvinyl alcohol, bentonite, citric acid, glycerin, gluconic acid, carbon black, polyether amine, nano silica, sodium dodecyl benzene sulfonate, potassium hydroxide, graphene oxide, carbon nanotube, pentanediol, acetic acid, kaolin, diatomite, paraffin, KH550 and the like are adopted as the raw materials. According to the invention, bentonite reacts with gluconic acid, the product and polyvinyl alcohol form an intermolecular hydrogen bond, and the water resistance is improved. Polyether amine is employed to modify carbon black and nano silica to obtain a core-shell structure reinforcement body; graphene oxide (GO) and PVA (polyvinyl alcohol) are bonded by the hydrogen bond, and the mechanical properties of the PVA material are improved; sodium dodecyl benzene sulfonate and potassium hydroxide are utilized to treat carbon nanotube to enhance tensile strength; and glutaraldehyde is taken as the cross-linking agent, acetic acid is adopted as the catalyst, and intermolecular acetalization crosslinking can occur to PVA to improve the water resistance.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a mineral-filled degradable polyvinyl alcohol preservative film and a preparation process thereof. Background technique [0002] With the improvement of public living standards, people pay more and more attention to food safety and environmental safety, which makes traditional plastic cling film questionable. Then, how to ensure food safety and shelf life while being environmentally friendly, and how to prepare edible or biodegradable plastic wrap have become an important direction for industry research and development. [0003] In his master's degree thesis "Preparation of Bentonite / PVA Preservative Film and Its Application in Mango Preservation", Huang Huirong used bentonite as the filling material and polyvinyl alcohol (PVA) as the substrate to study bentonite and its loading chemistry. The adsorption of ethylene by the fresh-keeping material of the additive (citric acid). ...

Claims

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Application Information

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IPC IPC(8): C08L29/04C08K13/06C08K9/04C08K9/02C08K3/34C08K3/04C08K3/36C08K7/24C08J5/18C08J3/24B65D65/46
CPCB65D65/466C08J3/24C08J5/18C08J2329/04C08K3/04C08K3/346C08K3/36C08K7/24C08K9/02C08K9/04C08K9/08C08K13/06C08K2201/011C08L29/04
Inventor 吴祥忠
Owner DANGTU COUNTY RUILONG FRUIT TREE PLANTING SPECIALIZED COOP
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