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Method for preparing photochromic micro-encapsulation

A photochromic and photochromic material technology, which is applied in the field of preparation of microcapsule-coated photochromic materials, can solve the problems of no detailed research, low fiber affinity, difficult processing, etc., and achieve strong practical value, Effects of reducing pollution and fast fading

Inactive Publication Date: 2008-07-23
BEIJING INSTITUTE OF CLOTHING TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most photosensitive color-changing dyes have low affinity to fibers and are difficult to process through conventional dyeing and printing processes; in melt spinning, color-changing dyes are dispersed in polymers, and their performance is affected by polymer molecules and microstructures, so it is necessary to The type of polymer and the microstructure of the fiber are selected and controlled, and it is also limited by the spinning conditions
[0004] In US Patent 5208132, the inventor Kamada mainly studied the application of photochromic materials, but did not involve detailed research on the preparation process of photochromic microcapsules

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Its preparation method of embodiment 1 comprises the following steps:

[0015] 1) Take 0.12g 1,3,3-trimethylspiro[indoline-2,3`-[3H]-[2,1-b]naphtho[1,4]oxazine, dissolve it in 10ml tetra In the vinyl chloride solution, a photochromic solution is obtained;

[0016] 2) Add 3.5 g of emulsifier SDS into 70 ml of water, dissolve it completely, add the photochromic solution prepared in step 1), and emulsify the obtained blended solution under an electric mixer at 1000 rpm for 15 minutes to obtain an emulsion;

[0017] 3) Add 35ml of melamine resin prepolymer with a mass concentration of 25% to the emulsion prepared in step 2) under stirring conditions at a rotating speed of 600rpm (the specific preparation of the melamine resin prepolymer: add 7g of melamine, 12ml of 37% formaldehyde solution and 25ml of deionized water, adjust the pH value of the solution to 9, heat to 70°C, and keep warm for 2 hours to obtain a melamine-formaldehyde prepolymer aqueous solution), and adjust...

Embodiment 2

[0020] 1) Take 0.08g of 1-hydroxyethyl-3,3-dimethyl-8'-nitroindoline spiropyran, dissolve it in 10ml of toluene, and make a photochromic solution;

[0021] 2) Add 5 g of emulsifier SDS to 70 ml of water to completely dissolve it, then add the photochromic solution prepared in step 1), and emulsify the obtained blended solution for 10 min under an electric mixer at 10,000 rpm to obtain an emulsion;

[0022] 3) Add 25ml of melamine resin prepolymer with a mass concentration of 25% to the emulsion prepared in step 2) under stirring at a speed of 500rpm (the specific preparation of the melamine resin prepolymer: add 7g of melamine, 12ml of 37% formaldehyde solution and 25ml of deionized water, adjust the pH value of the solution to 9, heat to 70 ° C, and keep the temperature for 2 hours to obtain the melamine-formaldehyde prepolymer aqueous solution), and adjust the pH value to 4 with ammonium chloride solution, and then Add 150ml of dispersant PVA solution with a mass concentrati...

Embodiment 3

[0025] 1) Take 0.12g 1,3,3-trimethylspiro[indoline-2,3`-[3H]-[2,1-b]naphtho[1,4]oxazine, dissolve it in 10ml tetra In the vinyl chloride solution, a photochromic solution is obtained;

[0026] 2) Add 1.5 g of emulsifier SDS into 70 ml of water to completely dissolve it, then add the photochromic solution prepared in step 1), and emulsify the obtained blended solution under a 1000 rpm electric mixer for 60 min to obtain an emulsion;

[0027] 3) Add 25ml of melamine resin prepolymer with a mass concentration of 25% to the emulsion prepared in step 2) under stirring conditions at a rotating speed of 800rpm (the specific preparation of the melamine resin prepolymer: add 7g of melamine, 12ml of 37% formaldehyde solution and 25ml of deionized water, adjust the pH value of the solution to 9, heat to 70°C, and keep it warm for 2 hours to obtain a melamine-formaldehyde prepolymer aqueous solution), and adjust the pH value to 6 with phosphoric acid solution, then add 50ml A dispersant ...

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Abstract

The invention relates to a preparation method for a photochromic micro encapsulant, belonging to technical field of functional macromolecular materials, which comprises following steps: dissolving the photochromic micro encapsulant in organic solvent to obtain photochromic solution; completely dissolving emulsifier, adding the photochromic solution, then emulsion is obtained after the emulsification of mixed solution; adding melamine resin prepolymer in emulsion; adjusting the pH value 3 to 6; adding dispersing agent, then the photochromic micro encapsulant is obtained through cleaning and drying. The preparation method for the photochromic micro encapsulant has the advantages of ability to greatly reduced harm to the health of human body and environmental pollution, simple operation process, improved acid and alkaline resistance and fatigue resistance of chromic material, prolonged service life, good photochromic properties and fast discoloration and decoloration of the prepared micro encapsulant, and wide application prospect in anti-counterfeit and textile field.

Description

technical field [0001] The invention belongs to the technical field of functional polymer material preparation. In particular, it relates to a preparation technology of microcapsule-coated photochromic materials. Background technique [0002] Since Marckwald first discovered that some solid or liquid compounds have photochromic properties in 1899, photochromic technology has been widely used in many fields, such as textiles, daily necessities, characteristic photosensitive materials and information storage materials, etc. played an important role. Photochromic materials have the characteristics of sensitive color change and bright color, but are easily affected by environmental factors such as temperature, light, PH value and oxygen, resulting in oxidative deterioration and poor fatigue resistance. [0003] The earliest and easiest way to combine photochromic materials with fabrics is printing and dyeing techniques. However, most photosensitive color-changing dyes have lo...

Claims

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Application Information

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IPC IPC(8): C09K9/00B01J13/02
Inventor 裴广玲金玲赵国樑周静宜王晓春
Owner BEIJING INSTITUTE OF CLOTHING TECHNOLOGY
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