Preparation method and application of thermochromic microcapsules with high sensitivity

A thermochromic and high-sensitivity technology, which is applied in the field of preparation of thermochromic microcapsules, can solve the problems such as the decreased sensitivity of thermochromic materials to discoloration, prolong storage and effective use time, arrange neatly, and improve heat transfer efficiency. Effect

Inactive Publication Date: 2019-05-17
BEIJING INSTITUTE OF CLOTHING TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem of decreased discoloration sensitivity of thermochromic materials existing in the prior art, one of the purposes of this application is to provide a method for preparing thermochromic microc

Method used

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  • Preparation method and application of thermochromic microcapsules with high sensitivity

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Embodiment 1

[0033] A preparation method for graphene-modified melamine resin thermochromic microcapsules, comprising the following steps:

[0034] 1) Weigh 10g and 14g of melamine and 37% formaldehyde aqueous solution, add 0.040g of graphene oxide and 50mL of distilled water, use triethanolamine to adjust the pH to 8-9, at 90°C with magnetic stirring After reacting for 1 hour, a modified melamine resin prepolymer with a solid mass concentration of 25.8% was obtained as a microcapsule wall material.

[0035] 2) Weigh crystal violet lactone, bisphenol A and lauryl alcohol according to a mass ratio of 1:4:60, keep warm at 90° C. and stir and mix for 1 hour to obtain a molten mixture as a microcapsule core material.

[0036] 3) Take the core material and the wall material according to the ratio of the mass ratio of the core wall to 1:1, add lauryl ammonium chloride and an appropriate amount of deionized water accounting for 7% of the core material mass fraction in the core material, and use h...

Embodiment 2

[0040] A preparation method for graphene-modified melamine resin thermochromic microcapsules, comprising the following steps:

[0041] 1) Weigh 10g and 16g of melamine and 37% formaldehyde aqueous solution, add 0.052g of aminographene and 50mL of distilled water, adjust the pH to 8-9 with triethanolamine, and place it at 80°C with magnetic stirring After reacting for 0.5 h, a modified melamine resin prepolymer with a mass concentration of 26.5% was obtained as a microcapsule wall material.

[0042]2) Weigh crystal violet lactone, bisphenol A and myristyl alcohol according to the mass ratio of 1:4:65, keep warm at 90° C. and stir and mix for 1 hour to obtain a molten mixture as a microcapsule core material.

[0043] 3) Take the core material and the wall material according to the ratio of the mass ratio of the core material to 1:1.5, add cetyltrimethylammonium bromide and an appropriate amount of deionized water accounting for 8% of the core material mass fraction in the core m...

Embodiment 3

[0047] A preparation method for graphene-modified melamine resin thermochromic microcapsules, comprising the following steps:

[0048] 1) Weigh 10g and 18g of melamine and 37% formaldehyde aqueous solution, add 0.060g of graphene oxide and 50mL of distilled water, use triethanolamine to adjust the pH to 8-9, at 100°C with magnetic stirring After reacting for 0.5 h, a modified melamine resin prepolymer with a mass concentration of 31.2% was obtained as a microcapsule wall material.

[0049] 2) Weigh crystal violet lactone, bisphenol A and myristyl alcohol according to the mass ratio of 1:6:70, keep warm at 90° C. and stir and mix for 1 hour to obtain a molten mixture as a microcapsule core material.

[0050] 3) Take the core material and the wall material according to the ratio of the core-wall mass ratio of 1:1.5, add cetylpyridinium bromide and appropriate amount of deionized water accounting for 10% of the core material mass fraction in the core material, and use high-speed ...

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Abstract

The application discloses a preparation method and application of thermochromic microcapsules with high sensitivity, and belongs to the technical field of thermochromic materials. The preparation method comprises the following steps: using a graphene-modified melamine resin prepolymer as a wall material of a microcapsule material; mixing and melting leuco-dye, a colour-developing agent and a solvent to obtain a core material of the microcapsule material; adding a graphene dispersion solution into the core material, and performing emulsification to obtain uniform emulsion; adding the uniform emulsion into the wall material, and performing reaction crosslinking and posttreatment to obtain graphene-modified thermochromic microcapsules. By adopting the preparation method, the electron transferspeed between the colour-developing agent and the leuco-dye and the mechanical performance of the wall material are improved by graphene, so that the thermochromic response speed of the prepared graphene-modified microcapsules is improved, and the integral structure and thermal stability are improved.

Description

technical field [0001] The application belongs to the technical field of color-changing materials, and more specifically, relates to a preparation method and application of thermochromic microcapsules with high sensitivity. Background technique [0002] Thermochromic material refers to a functional material whose color can change reversibly with temperature rise and fall when the temperature is higher or lower than a certain temperature range (determined by the material itself), that is, it has color memory function and can be used repeatedly. A series of products used in human body temperature sensing, such as medical treatment, advertising textiles, children's toys, etc., can also be used for commercial anti-counterfeiting. [0003] Thermochromic materials can be divided into three categories: inorganic, organic and liquid crystal, which have the characteristic that the color of the material changes with temperature. Organic products have broader application prospects due...

Claims

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Application Information

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IPC IPC(8): B01J13/14C09K9/00
Inventor 梁燕
Owner BEIJING INSTITUTE OF CLOTHING TECHNOLOGY
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