Method for preparing forward-switched reversible thermochromic composite film

A composite film and temperature-sensitive discoloration technology, which is applied in the field of preparation of reversible discoloration composite films, can solve the problems of destroying the apparent integrity and affecting the appearance, and achieve the effect of maintaining product integrity, low cost, and sensitive discoloration

Inactive Publication Date: 2016-12-07
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing thermochromic film is a reverse switch, which develops color at room temperature and disappears when the temperature rises, and when used on the surface of a product will destroy its apparent integrity and affect the appearance, and provide a forward switch Preparation method of temperature-induced reversible color-reversing composite film

Method used

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  • Method for preparing forward-switched reversible thermochromic composite film
  • Method for preparing forward-switched reversible thermochromic composite film
  • Method for preparing forward-switched reversible thermochromic composite film

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specific Embodiment approach

[0026] Specific embodiments: This embodiment is a method for preparing a positive switch temperature-induced reversible color composite film, which is completed according to the following steps:

[0027] 1. Glass plate pretreatment: use deionized water to rinse the surface of the glass plate, and then use absolute ethanol to rinse to obtain a pretreated glass plate;

[0028] 2. Add polyvinyl alcohol and dextrin to deionized water, then magnetically stir the reaction at a temperature of 70°C to 75°C and a stirring speed of 750r / min to 850r / min for 2h to 2.5h, and then stand at room temperature for 1h ~2h, to obtain a mixed solution;

[0029] The mass of polyvinyl alcohol described in step 2 and the volume ratio of deionized water are 2g:(90mL~100mL);

[0030] The mass of dextrin described in step 2 and the volume ratio of deionized water are 2g:(90mL~100mL);

[0031] 3. Add the temperature-sensitive color-changing material to the mixed solution obtained in step 2, then stir t...

specific Embodiment approach 2

[0043] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the dextrin described in step 2 is white dextrin. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0044] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the size of the glass plate in Step 1 is 80mm×40mm. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a method for preparing a forward-switched reversible thermochromic composite film and relates to preparation methods for reversible thermochromic composite films. The object of the invention is to solve the problems that the existing thermochromic films are reversely switched, are chromogenic at room temperature and are achromatic during heating-up, and the apparent integrity of a product can be destroyed and the attractiveness of the product is affected when the existing thermochromic films are applied to the surface of the product. The method comprises the steps: (1) pretreating a glass plate; (2) preparing a mixed solution; (3) preparing a coating solution; and (4) carrying out spraying and drying, thereby obtaining the forward-switched reversible thermochromic composite film. The reversible thermochromic composite film prepared by the method is forwardly switched, are achromatic at room temperature and are chromogenic during heating, so that the aim of keeping integrity of the product can be achieved when the reversible thermochromic composite film is applied to the surface of the product; and the forward-switched reversible thermochromic composite film prepared by the method has relatively good elastoplasticity and is environmentally friendly, environment-friendly, non-toxic and harmless. The invention can achieve the method for preparing the forward-switched reversible thermochromic composite film.

Description

technical field [0001] The invention relates to a preparation method of a reversible color-reversing composite film. Background technique [0002] At present, thermochromic films are widely used in substrates such as glass products, ceramic products and plastic products to prepare handicrafts, tableware, advertising materials, packaging materials, CDs, etc. The existing thermochromic film is usually a reverse switch, that is, the color develops at room temperature and disappears when the temperature rises. When used on the surface of a product, its apparent integrity will be destroyed and the appearance will be affected. The thermochromic film prepared by the method is a positive switch, colorless at normal temperature, and develops color when heated, so it can maintain the integrity of the product when used on the surface of the product. The film prepared by the method has better discoloration performance, sensitive response, bright color after discoloration, and elegant a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L29/04C08L3/02
CPCC08J5/18C08J2329/04C08J2403/02C08L3/02C08L29/04
Inventor 李坚李莹莹李国梁惠彬
Owner NORTHEAST FORESTRY UNIVERSITY
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