Thermo-sensitive discoloration material microcapsule and preparation method thereof

A thermochromic and microcapsule technology, applied in microcapsule preparations, color-changing fluorescent materials, microsphere preparation, etc., can solve the problems of insufficient environmental protection operation, long-term effective preservation problems, complex problems, etc., to reduce the harm to human health, overcome the Dependence on environment, effect of low volatilization and residual amount

Inactive Publication Date: 2012-05-30
BEIJING CTA TEX CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At the end of the 20th century, heat-sensitive materials developed rapidly. Conventional heat-sensitive materials disperse leuco dyes and color developer solid crystal particles directly in the binder, and heat the crystals to a molten state to cause a color reaction, but the two can react Direct contact of ingredients makes long-term effective storage a challenge
The preparation method of heat-sensitive color-changing microcapsules proposed in US Patent 4028118 uses cyclohexane as a solvent, which is not environmentally friendly and complicated to operate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1, preparation thermosensitive discoloration material microcapsule

[0027] The preparation method is as follows:

[0028] 1) After heating and melting 50g of myristyl alcohol (solvent) in a flask, add 1g of crystal violet lactone (color developing agent) and 5g of bisphenol A (color developing agent), slowly raise the temperature to 90°C, fully stir and keep warm After 1 hour, cool naturally to 40°C to obtain a thermosensitive color-changing compound solution.

[0029] 2) Add 5 g of emulsifier styrene-maleic anhydride copolymer into 30 ml of water, and dissolve it completely to obtain an emulsifier solution. Add 3 g of the heat-sensitive color-changing compound solution prepared in step 1) and 50 g of water into the emulsifier solution and mix them. The blended solution was emulsified under a high-speed mixer at 1000 rpm for 30 minutes to obtain a heat-sensitive discoloration compound emulsion.

[0030] 3) Adjust the pH value of the emulsion prepared in s...

Embodiment 2

[0032] Embodiment 2, preparation thermosensitive discoloration material microcapsule

[0033] The preparation method is as follows:

[0034] 1) After heating and melting 40g of cetyl alcohol in a flask, add 1g of 3-diethylamino-7,8-phenylfluorane (color developing agent) and 5g 1,5-bishydroxynaphthalene (color developing agent), Slowly raise the temperature to about 90°C, fully stir and keep warm for 1 hour, and naturally cool to 50°C to obtain a thermosensitive color-changing compound solution.

[0035] 2) Add 3 g of emulsifier sodium lauryl sulfate into 30 ml of water, and dissolve it completely to obtain an emulsifier solution. Add 4g of the thermosensitive color-changing compound solution prepared in step 1) to the emulsifier solution and mix with 50g of water, and emulsify the blended solution under a 1200rpm high-speed mixer for 20min to obtain a thermosensitive color-changing compound emulsion.

[0036] 3) Adjust the pH value of the emulsion prepared in step 2) to 4 w...

Embodiment 3

[0038] Embodiment 3, preparation thermosensitive discoloration material microcapsule

[0039] The preparation method is as follows:

[0040] 1) After heating and melting 50g of dodecanol (solvent) in a flask, add 1g of 3-chloro-6 anilinofluorane (color developing agent) and 6g phenylethyl p-hydroxyphenylacetate (color developing agent), slowly Raise the temperature to 90°C, fully stir and keep warm for 1 hour, and naturally cool to 40-50°C to obtain a thermosensitive color-changing compound solution.

[0041] 2) 2) Add 5 g of emulsifier sodium dodecylbenzene sulfonate into 30 ml of water and dissolve it completely to obtain an emulsifier solution. Add 6g of the thermosensitive color-changing compound solution prepared in step 1) to the emulsifier solution and mix with 60g of water, and emulsify the blended solution under a high-speed mixer at 1000rpm for 40min to obtain a thermosensitive color-changing compound emulsion.

[0042]3) under the stirring condition of 400rpm rota...

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Abstract

The invention discloses a thermo-sensitive discoloration material microcapsule and a preparation method thereof. The microcapsule is composed of a core material and a wall material for covering the core material, wherein the core material comprises a thermo-sensitive discoloration compound composed of a chromogenic reagent, a color-developing agent and a solvent; the wall material is a melamine resin pre-polymer; the mass ratio of the thermo-sensitive discoloration compound to the melamine resin pre-polymer is 1:(1-2). The preparation method comprises the following steps of: mixing the chromogenic reagent, the color-developing agent and the solvent to form a thermo-sensitive discoloration solution under the heating condition; adding an emulsifying agent solution into the thermo-sensitive discoloration solution and emulsifying a commixed solution to obtain an emulsion; adjusting the pH value to 3-6 and adding the melamine resin pre-polymer into the emulsion; reacting at a temperature for 60-70 DEG C for 1-1.5 hours and then cooling to 30-40 DEG C; then adding a dispersant; and washing and drying to obtain the thermo-sensitive discoloration microcapsule. According to the method provided by the invention, the influences on human bodies and environments are greatly reduced; the operation is simple, the prepared microcapsule products can fast change color and fade and the effect is obvious, so that the thermo-sensitive discoloration material microcapsule can be widely applied in the fields of anti-counterfeiting textile and printing and the like.

Description

technical field [0001] The invention relates to a thermosensitive color-changing material microcapsule and a preparation method thereof. Background technique [0002] Thermochromic materials refer to materials with thermochromic properties. Thermochromism, that is, certain substances can undergo color changes due to structural changes at specific ambient temperatures, also known as "thermochromism" or "thermochromism". There are many uses of heat-sensitive color-changing materials. At present, its scope of use is mainly in printing, paint, toys, anti-counterfeiting, textile and clothing, and daily necessities. [0003] At the end of the 20th century, heat-sensitive materials developed rapidly. Conventional heat-sensitive materials disperse leuco dyes and color developer solid crystal particles directly in the binder, and heat the crystals to a molten state to cause a color reaction, but the two can react The direct contact of ingredients makes long-term effective storage d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K9/02B01J13/04
Inventor 党一哲吕世静黄文博董德敢
Owner BEIJING CTA TEX CHEM
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