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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 effects of improving adhesion fastness, excellent optical performance, and improving barrier performance

Inactive Publication Date: 2011-06-15
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 packaging film with poor heat resistance is rare in the world, and there is no report in China.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Acid oxidation treatment of low-density polyethylene film: Mix potassium dichromate, deionized water and concentrated sulfuric acid at a mass ratio of 5:8:100, and heat it to 50℃ in a water bath, and then increase the thickness to 18 Micron cleaned low-density polyethylene film is put into it for acid oxidation treatment, the film is taken out after 30 minutes, 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, and drop them into the mixture of deionized water and ethanol. Among them, ethyl orthosilicate is coupled with silane. The molar ratio of agent KH151 is 7:1, and the molar ratio of tetraethyl orthosilicate 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 sulfuric acid. , Placed in a constant temperatu...

Embodiment 2

[0029] (1) Acid oxidation treatment of biaxially oriented polypropylene film: Mix potassium dichromate, deionized water, and concentrated sulfuric acid at a mass ratio of 5:8:100, and heat it to 50°C in a water bath, and then set the thickness to The 21-micron cleaned biaxially oriented polypropylene film is put into it for acid oxidation treatment, the film is taken out after 30 minutes, 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, and drop them into the mixture of deionized water and ethanol. Among them, ethyl orthosilicate is coupled with silane. The molar ratio of reagent KH560 is 3:2, and the molar ratio of tetraethylorthosilicate and silane coupling agent KH560:ethanol:deionized water is 1:4:3. After mixing for 30 minutes, adjust the PH value to 3 with concentrated hydrochloric acid. , Placed in a co...

Embodiment 3

[0036] (1) PET (polyethylene terephthalate) polyester film acid oxidation treatment: mix potassium dichromate, deionized water, and concentrated sulfuric acid at a mass ratio of 5:8:100 into a mixed solution, and then water bath Heat it to 50°C, then put the cleaned PET polyester film with a thickness of 50 microns into it for acid oxidation treatment. After 10 minutes, the film is taken out, rinsed repeatedly with deionized water, and then ultrasonically cleaned, taken out, and dried. spare;

[0037] (2) Preparation of silica sol: uniformly mix ethyl orthosilicate and silane coupling agent KH560 with ethanol, and drop them into the mixture of deionized water and ethanol. Among them, ethyl orthosilicate is coupled with silane. The molar ratio of reagent KH560 is 1:1, and the molar ratio of ethyl orthosilicate 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 hydrochloric acid. , Placed in a c...

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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 composite film. 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 / silica hybrid barrier packaging composite film, and belongs to the technical field of packaging films. Background technique [0002] Commonly used packaging films such as polyolefins, polyesters, and polyamides are widely used in the packaging field because of their transparency, easy processing, and low price. However, oxygen, carbon dioxide, water vapor and other gases can easily penetrate and affect the packaging. The performance and longevity of objects. In order to improve the barrier properties of packaging films, chemical vapor deposition, physical vapor deposition and other technologies are currently used to deposit barrier layers such as silicon oxide, titanium oxide, aluminum oxide, and silicon nitride on the surface of packaging films to prepare comprehensive optical and mechanical properties. A barrier packaging film with excellent performance, but the process is complicated and the cos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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