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Transparent oxygen-blocking water-blocking film and preparation method thereof

A thin-film, oxygen-barrier technology, applied in the coating and other directions, can solve the problems of plasticization, oxygen-barrier and water-barrier performance, and air-tightness deterioration.

Active Publication Date: 2017-08-08
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in a high-humidity environment, the polymer components in the organic-inorganic composite material obtained by the above method are prone to plasticization under the action of water molecules, resulting in poor air tightness and decreased oxygen and water barrier properties.

Method used

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  • Transparent oxygen-blocking water-blocking film and preparation method thereof
  • Transparent oxygen-blocking water-blocking film and preparation method thereof
  • Transparent oxygen-blocking water-blocking film and preparation method thereof

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preparation example Construction

[0034] The present invention also provides a method for preparing the above-mentioned transparent oxygen- and water-blocking film, comprising the following steps:

[0035] mixing hydrotalcite nanosheets with Tween 80 aqueous solution, stirring at room temperature for 2 to 5 hours, and performing hydrophobic modification to obtain hydrophobically modified hydrotalcite nanosheets;

[0036] Dispersing the hydrophobically modified hydrotalcite nanosheets in water to obtain a hydrophobically modified hydrotalcite nanosheet dispersion;

[0037] The hydrophobically modified hydrotalcite nanosheet dispersion and the hydrophobic polymer aqueous dispersion are alternately spin-coated on the surface of the film substrate to obtain a transparent oxygen- and water-blocking film.

[0038] In the invention, the hydrotalcite nanosheets are first mixed with the Tween 80 aqueous solution, stirred at room temperature for 2-5 hours, separated, washed and dried to obtain the hydrophobically modifi...

Embodiment 1

[0071] 1. Mix 5.1282g Mg(NO 3 ) 2 ·6H 2 O, 3.7513gAl(NO 3 ) 3 9H 2 O was dissolved in 50mL deionized water to obtain a mixed metal salt solution; 4g urea was dissolved in 50mL deionized water to obtain a urea solution; the metal salt solution was mixed with the urea solution, stirred evenly, and placed in an oven at 110°C. Crystallize for 24 hours, then naturally cool the reaction system to room temperature, and centrifuge to obtain a solid; wash the solid with deionized water until the deionized water after washing is neutral, and obtain hydrotalcite nanosheets;

[0072] 2. Disperse the hydrotalcite nanosheets in an aqueous solution of Tween 80 with a concentration of 0.25wt.% according to the mass ratio of the hydrotalcite nanosheets to Tween 80 of 35:1, stir at room temperature for 4 hours, and then separate, Washing and drying to obtain hydrophobically modified hydrotalcite nanosheets;

[0073] 3. Prepare the aqueous dispersion of hydrophobically modified hydrotalcit...

Embodiment 2

[0085] 1. Mix 5.1282g Mg(NO 3 ) 2 ·6H 2 O, 3.7513gAl(NO 3 ) 3 9H 2 O was dissolved in 50mL deionized water to obtain a mixed metal salt solution; 4g urea was dissolved in 50mL deionized water to obtain a urea solution; the metal salt solution was mixed with the urea solution, stirred evenly, and placed in an oven at 100°C. Crystallize for 26 hours, then naturally cool the reaction system to room temperature, and centrifuge to obtain a solid; wash the solid with deionized water until the deionized water after washing is neutral, and obtain hydrotalcite nanosheets;

[0086] 2. According to the mass ratio of hydrotalcite nanosheets to Tween 80 of 30:1, the hydrotalcite nanosheets were dispersed in an aqueous solution of Tween 80 with a concentration of 0.25wt.%, stirred at room temperature for 4 hours, and then separated , washing, and drying to obtain hydrophobically modified hydrotalcite nanosheets;

[0087] 3. Prepare a hydrophobically modified hydrotalcite nanosheet aqu...

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Abstract

The invention provides a transparent oxygen-blocking water-blocking film and a preparation method thereof. According to the transparent oxygen-blocking water-blocking film provided by the invention, through modifying hydrotalcite nanosheets by using Tween 80, hydrophilic groups of the Tween 80 are adsorbed to surfaces of the hydrotalcite nanosheets, and hydrophobic groups are located outside the hydrotalcite nanosheets, so that the hydrotalcite nanosheets have hydrophobicity, and the water-blocking performance of the film is improved; by the hydrophobic-modified hydrotalcite nanosheets with a high length-diameter ratio and an orderly-oriented structure parallel to height of a film substrate, a path by that oxygen and vapor permeate the film can be prolonged, and thus, the action of blocking the oxygen and the vapor is achieved; in addition, hydrophobic modified hydrotalcite nanosheet layers and hydrophobic polymer layers are laminated alternately, so that the stability of the organic-inorganic composite film is guaranteed.

Description

technical field [0001] The invention relates to the technical field of packaging materials, in particular to a transparent oxygen- and water-blocking film and a preparation method thereof. Background technique [0002] Products such as food, medicine, and electronic devices are prone to deterioration or corrosion when in contact with oxygen and water, and usually need to be stored in an oxygen-free and water-free atmosphere. Therefore, packaging materials for products that are easily deteriorated and corroded are required to have excellent resistance. Oxygen and water barrier properties. [0003] Plastic film materials are transparent, bendable, and have excellent oxygen and water barrier properties, and have been widely used as sealing packaging materials. However, the plastic film material has poor thermal stability and low mechanical stability, which cannot fully meet the requirements of hermetic packaging, thus limiting its application. [0004] By adding an appropriat...

Claims

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Application Information

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IPC IPC(8): C08J7/04C08L67/02C08L23/06C08L75/04
CPCC08J7/0423C08J2323/06C08J2367/02C08J2375/04C08J2423/12C08J2425/06C08J2427/16C08J2483/04
Inventor 韩景宾王嘉杰许晓芝卫敏
Owner BEIJING UNIV OF CHEM TECH
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