Method for preparing chitosan/silicon dioxide hybridization barrier packaging composite film

A technology of silicon dioxide and composite film, applied in the direction of coating, etc., can solve the problems of rare heat resistance, achieve the effect of improving adhesion fastness, preventing cracking or falling off, and simple preparation process

Inactive Publication Date: 2010-03-17
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the research on using the sol-gel method to load the barrier layer on the packag

Method used

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Examples

Experimental program
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Example Embodiment

[0021] Example 1:

[0022] (1) Low-density polyethylene film acid oxidation treatment: Potassium dichromate, deionized water and concentrated sulfuric acid are prepared into a mixed solution with a mass ratio of 5:8:100, and heated to 50°C in a water bath, and then the thickness is 18 The micron cleaned low-density polyethylene film is placed in it for acid oxidation treatment. After 30 minutes, the film is taken out, rinsed repeatedly with deionized water, and then ultrasonically cleaned, taken out, dried, and set aside;

[0023] (2) Preparation of silica sol: uniformly mix ethyl orthosilicate and silane coupling agent KH151 with ethanol, drop into the mixed solution of deionized water and ethanol, wherein, ethyl orthosilicate is coupled with silane The molar ratio of agent KH151 is 7:1, and the molar ratio of orthosilicate ethyl ester and silane coupling agent KH151: ethanol: deionized water is 1:4:3. After mixing for 30 minutes, adjust the pH value to 1.5 with concentrated ...

Example Embodiment

[0028] Example 2:

[0029] (1) Acid oxidation treatment of biaxially stretched polypropylene film: Potassium dichromate, deionized water, and concentrated sulfuric acid are prepared into a mixed solution in a mass ratio of 5:8:100, and heated to 50°C in a water bath, and then the thickness is 21-micron clean biaxially oriented polypropylene film is put into it for acid oxidation treatment, after 30 minutes, the film is taken out, rinsed repeatedly with deionized water, then ultrasonically cleaned, taken out, dried, and set aside;

[0030] (2) Preparation of silica sol: uniformly mix ethyl orthosilicate and silane coupling agent KH560 with ethanol, drop into the mixed solution of deionized water and ethanol, wherein, ethyl orthosilicate is coupled with silane The molar ratio of agent KH560 is 3:2, and the molar ratio of orthosilicate ethyl ester and silane coupling agent KH560:ethanol:deionized water is 1:4:3. After mixing for 30 minutes, adjust the pH value to 3 with concentra...

Example Embodiment

[0035] Example 3:

[0036] (1) Acid oxidation treatment of PET (polyethylene terephthalate) polyester film: Potassium dichromate, deionized water, and concentrated sulfuric acid are prepared into a mixed solution with a mass ratio of 5:8:100, and the water bath Heat to 50°C, then put the cleaned PET polyester film with a thickness of 50 microns into it for acid oxidation treatment, take out the film after 10 minutes, rinse it repeatedly with deionized water, then perform ultrasonic cleaning, take it out, and dry it. spare;

[0037] (2) Preparation of silica sol: uniformly mix ethyl orthosilicate and silane coupling agent KH560 with ethanol, drop into the mixed solution of deionized water and ethanol, wherein, ethyl orthosilicate is coupled with silane The molar ratio of agent KH560 is 1:1, and the molar ratio of orthosilicate ethyl ester and silane coupling agent KH560:ethanol:deionized water is 1:4:3. After mixing for 30 minutes, adjust the pH value to 5 with concentrated hy...

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Abstract

The invention discloses a method for preparing a chitosan/silicon dioxide hybridization barrier packaging composite film, comprising the following steps: carrying out acid oxidation treatment to the packaging film; preparing silicon dioxide sol by adopting tetraethoxysilane, silane coupling agent, alcohol and deionized water; mixing chitosan solution and silicon dioxide sol and preparing chitosan/silicon dioxide hybridization sol; adopting a dipping-pulling method to coat the chitosan /silicon dioxide hybridization sol on the packaging film after the acid oxidation treatment, and drying. In the invention, the natural polymer chitosan is adopted as organic phase, a chitosan/silicon dioxide organic-inorganic hybridization barrier layer is loaded on a packaging film substrate with poorer thermal resistance, and the hybridization barrier layer and the packaging film are closely attached to jointly form the chitosan/silicon dioxide organic-inorganic hybridization barrier packaging compositefilm. The invention has simple preparation process and low cost; and the prepared chitosan/silicon dioxide hybrid packaging composite film has remarkably improved barrier property as well as excellent mechanical property and optical property.

Description

technical field [0001] The invention relates to a method for preparing a chitosan / silicon dioxide hybrid barrier packaging composite film, which belongs to the technical field of packaging films. Background technique [0002] Commonly used packaging films such as polyolefin, polyester, and polyamide are widely used in the packaging field due to their advantages of transparency, easy processing, and low price. However, gases such as oxygen, carbon dioxide, and water vapor are easy to pass through and affect the packaging. performance and lifespan. In order to improve the barrier properties of packaging films, chemical vapor deposition, physical vapor deposition and other technologies are usually used to deposit barrier layers such as silicon oxide, titanium oxide, aluminum oxide, and silicon nitride on the surface of packaging films to prepare optical properties and mechanical properties. Barrier packaging film with excellent performance, but the process is complicated and t...

Claims

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Application Information

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IPC IPC(8): C08J7/04C08J7/14C08L5/08C08L23/00C08L67/00C08L77/00C08K3/36
Inventor 王家俊朱丽静吴俊红孙辉
Owner ZHEJIANG SCI-TECH UNIV
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