Photo-induced reversible macromolecular shrink film and preparation method thereof

A polymer, shrink film technology, applied in flat products, other household appliances, applications, etc., can solve the problems of high cost and complex modification process, and achieve the effect of low cost and high reuse rate

Active Publication Date: 2017-09-12
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of its own material factors, its shrinkage rate is only about 30%, and the shrinkage rate of PE heat

Method used

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  • Photo-induced reversible macromolecular shrink film and preparation method thereof
  • Photo-induced reversible macromolecular shrink film and preparation method thereof
  • Photo-induced reversible macromolecular shrink film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Example 1 Preparation of Photopolymer Shrink Film

[0051] The photopolymer shrink film is prepared by the following steps:

[0052] (1) Preparation of oxidized carbon nanotubes: carbon nanotubes are oxidized in a mixed solution of nitric acid / hydrochloric acid / water (nitric acid: hydrochloric acid: water = 1:1:1, volume ratio) at 80°C for 4 hours with magnetic stirring and centrifuged to obtain carbon dioxide Nanotubes were washed with distilled water and dried for later use; the mass fraction of carbon nanotubes in the mixture was 0.5wt%, the oxidation temperature was 80°C, and the oxidation time was 4h;

[0053] (2) Preparation of sulfonated carbon nanotubes: add oxidized carbon nanotubes in (1) to obtain a suspension after adding distilled water to ultrasonic for 1 h (the mass fraction of oxidized carbon nanotubes in the resulting suspension is 0.25wt%), and the suspension is added dropwise to The hydrochloric acid solution (in the hydrochloric acid solution) that ...

Embodiment 2

[0060] Example 2 Preparation of Photopolymer Shrink Film

[0061] The photopolymer shrink film is prepared by the following steps:

[0062] (1) Preparation of oxidized carbon nanotubes: carbon nanotubes are oxidized in a mixed solution of nitric acid / hydrochloric acid / water (nitric acid: hydrochloric acid: water = 1:1:1, volume ratio) at 80°C for 4 hours with magnetic stirring and centrifuged to obtain carbon dioxide Nanotubes were washed with distilled water and dried for later use; the mass fraction of carbon nanotubes in the mixture was 0.5wt%, the oxidation temperature was 80°C, and the oxidation time was 4h;

[0063] (2) Preparation of sulfonated carbon nanotubes: add oxidized carbon nanotubes in (1) to obtain a suspension after adding distilled water to ultrasonic for 1 h (the mass fraction of oxidized carbon nanotubes in the resulting suspension is 0.25wt%), and the suspension is added dropwise to The hydrochloric acid solution (in the hydrochloric acid solution) that ...

Embodiment 3

[0074] Example 3 Preparation of Photopolymer Shrink Film

[0075] The photopolymer shrink film is prepared by the following steps:

[0076] (1) Preparation of oxidized carbon nanotubes: carbon nanotubes are oxidized in a mixed solution of nitric acid / hydrochloric acid / water (nitric acid: hydrochloric acid: water = 1:1:1, volume ratio) at 80°C for 4 hours with magnetic stirring and centrifuged to obtain carbon dioxide Nanotubes were washed with distilled water and dried for later use; the mass fraction of carbon nanotubes in the mixture was 0.5wt%, the oxidation temperature was 80°C, and the oxidation time was 4h;

[0077] (2) Preparation of sulfonated carbon nanotubes: add oxidized carbon nanotubes in (1) to obtain a suspension after adding distilled water to ultrasonic for 1 h (the mass fraction of oxidized carbon nanotubes in the resulting suspension is 0.25wt%), and the suspension is added dropwise to The hydrochloric acid solution (in the hydrochloric acid solution) that ...

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Abstract

The invention belongs to the field of functional composite materials and relates to a photo-induced reversible macromolecular shrink film and a preparation method thereof. The photo-induced reversible macromolecular shrink film is prepared from, by weight, 70-95 parts of a polymer and 5-30 parts of a polyurethane/modified carbon nanotube composite, wherein the mass fraction of modified carbon nanotubes in the polyurethane/modified carbon nanotube composite is 0.2%-5%, the modified carbon nanotubes refer to sulfonated carbon nanotubes obtained by subjecting carbon nanotubes to oxidation, sulfonation and reducing treatment, and the polymer refers to polyethylene or polypropylene. The photo-induced reversible macromolecular shrink film has a photo-responsive property and is capable of shrinking by 70% or above through infrared illumination.

Description

technical field [0001] The invention relates to a photoreversible polymer shrink film and a preparation method thereof, belonging to the field of functional composite materials. Background technique [0002] Heat-shrinkable film is a film material widely used in the packaging field. Due to its thermal shrinkage properties, it is favored in the packaging field. The heat shrinkable film must have high puncture resistance, good shrinkage and certain shrinkage stress. The current mainstream heat shrinkable films are: [0003] Polyethylene (PE) film and PE heat shrinkable film are widely used in the integrated packaging of wine, cans, mineral water, various beverages, cloth and other products. The film has the characteristics of good flexibility, impact resistance, strong tear resistance, not easy to break, not afraid of moisture, and large shrinkage rate. [0004] POF film, POF heat shrinkable film is a multi-layer co-extruded polyolefin film. The film has the characteristics...

Claims

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Application Information

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IPC IPC(8): C08L23/08C08L75/04C08K9/04C08K9/02C08K7/24B29D7/01
CPCB29D7/01C08J5/18C08J2323/08C08J2475/04C08K2201/011C08L23/0815C08L2203/16C08L75/04C08K9/04C08K9/02C08K7/24
Inventor 杨伟喻鹏黄炎昊包睿莹刘正英杨鸣波
Owner SICHUAN UNIV
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