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Thermochromic transparent film and preparation method and application thereof

A thermochromic and thermochromic material technology, applied in textiles and papermaking, plant fiber, fiber treatment, etc., can solve problems such as material damage, and achieve the effects of improved transparency, obvious effects, and strong controllability of patterns

Active Publication Date: 2022-03-15
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the film prepared by this method has a layer-by-layer stack structure. Under repeated bending and stress, the layers are prone to peeling off, resulting in material damage.

Method used

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  • Thermochromic transparent film and preparation method and application thereof
  • Thermochromic transparent film and preparation method and application thereof
  • Thermochromic transparent film and preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0048] A method for preparing a thermochromic transparent film, comprising the following steps:

[0049] S1, using electrospinning method or melt blending phase separation method to prepare polymer nanofiber membrane;

[0050] S2. Loading of thermochromic material: Dissolving a predetermined amount of thermochromic material in a solvent to prepare a thermochromic mixed solution, and then coating, spraying or stencil printing the thermochromic mixed solution on the polymer nanometer the surface of the fiber membrane;

[0051] S3. Epoxy resin coating and curing: the nanofibrous film prepared in step S2 and loaded with thermochromic material on the surface is immersed in an epoxy resin solution containing a curing agent, fully soaked, taken out and cured to prepare a thermal Chromogenic transparent film.

Embodiment 1

[0054] A preparation method of thermochromic transparent film:

[0055] S1, the preparation of vinyl alcohol-ethylene graft copolymer (PVA-co-PE) nanofibrous membrane: utilize melt blending spinning method to prepare, comprise the following steps:

[0056] Blending PVA-co-PE and cellulose ester (CAB) according to the weight ratio of 20:80, and then utilizing twin-screw melt blending for spinning to prepare PVA-co-PE / CAB blended fibers;

[0057] Then use acetone to remove the CAB in the blended fiber to obtain PVA-co-PE nanofiber;

[0058] The nanofibers are dispersed in a mixed solvent composed of alcohol and water for high-speed shear dispersion, and a PVA-co-PE nanofiber film is obtained by a film coating method.

[0059] S2. Select spiropyran microcapsules as the thermochromic material, disperse it in a mixed solvent composed of ethanol and water (50:50) according to a 5% weight ratio to prepare a mixed solution, and use the stencil printing method to prepare the mixed sol...

Embodiment 2

[0081] A preparation method of thermochromic transparent film:

[0082] S1. Polyamide (PA6) nanofiber membrane: prepared by electrospinning, including the following steps: disperse PA6 in formic acid solution according to 10% by weight, set spinning voltage 15kV, receiving distance 12cm, and prepare PA6 nanofiber membrane. Fiber membrane.

[0083] S2. Select vanadium dioxide as the thermochromic material, disperse it in absolute ethanol solvent according to 10% by weight to prepare a mixed solution, and use the coating method to load the above mixed solution on the surface of the nanofiber membrane to form a striped pattern, After drying, a nanofibrous membrane with a striped pattern was obtained.

[0084] S3. Immerse the patterned nanofiber membrane in an epoxy resin solution containing a polyetheramine curing agent, so that the epoxy resin solution fully fills the pores of the nanofiber membrane, then take it out, and heat and cure it at 80°C to prepare A patterned thermoc...

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Abstract

The invention provides a thermochromic transparent film and its preparation method and application. The thermochromic transparent film includes a main body and an encapsulation layer for covering the main body; the main body includes a polymer nanofiber film and a thermochromic material layer loaded on the surface of the polymer nanofiber film , the material of the encapsulation layer is an epoxy resin layer. The preparation method provided by the present invention is to first prepare a polymer nanofiber film, then dissolve the thermochromic material in a solvent to form a thermochromic mixed solution, and then load the thermochromic mixed solution on the nanofibers in a predetermined pattern The surface of the film; finally, the nanofiber film loaded with the patterned thermochromic material layer is dipped into the epoxy resin solution, fully soaked, taken out and cured, and the patterned thermochromic transparent film is prepared. The thermochromic transparent film prepared by the invention has great application value in fields such as flexible devices, intelligent response, and aerospace.

Description

technical field [0001] The invention belongs to the technical field of film preparation, and in particular relates to a thermochromic transparent film and its preparation method and application. Background technique [0002] Thermochromic materials are a class of intelligent materials that change the visible absorption spectrum of the material when the temperature reaches a certain range, causing the color to change, and when the temperature returns to the initial temperature, the color of the material will also recover. Thermochromism is caused by reversible changes in the spectral properties of color-changing materials. Therefore, thermochromic materials are thermal memory functional materials and are widely used in anti-counterfeiting, digital display, intelligent pattern display, aerospace and other fields. [0003] At present, with the rapid development of flexible devices, flexible color-changing devices have become a current research hotspot, and have great applicatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M15/55D06M23/12D06M13/11D06M11/47D06M101/24D06M101/20D06M101/34D06M101/32D06M101/06
CPCD06M15/55D06M23/12D06M13/11D06M11/47D06M2101/24D06M2101/20D06M2101/34D06M2101/32D06M2101/06
Inventor 李沐芳王栋赵旭王文刘轲陆莹梅涛李颖颖
Owner WUHAN TEXTILE UNIV