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Urea formaldehyde photochromic microcapsule and preparation method thereof

A photochromic and microcapsule technology, applied in the chemical industry, can solve the problems of loss of reversible discoloration performance, prone to oxidative fission, weakening of discoloration and color depth, etc., to improve reversible discoloration performance and fatigue resistance, including The covering method is simple and efficient, and the effect of long half-life

Inactive Publication Date: 2018-08-10
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Photochromic compounds are easily affected by environmental factors such as pH, temperature, light, and oxidation, which lead to oxidative fission in the external environment, poor fatigue resistance under repeated irradiation, and loss of reversible discoloration and Discoloration and color depth weakening

Method used

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  • Urea formaldehyde photochromic microcapsule and preparation method thereof
  • Urea formaldehyde photochromic microcapsule and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Preparation of prepolymer, weigh 2g urea, dissolve in 8ml deionized water, transfer to a three-necked flask, add weighed 18.5g formaldehyde solution (containing 1.85g formaldehyde) while stirring, then add triethanolamine Adjust the pH to 8.5, slowly raise the temperature to 75°C, and react with magnetic stirring for 1h, cool to room temperature, and magnetically stir for 1h to obtain a urea-formaldehyde prepolymer;

[0027] (2) Add 0.9625g of spiropyran photochromic compound and 20ml of dioctyl phthalate into a round bottom flask, heat to 80°C and stir until completely dissolved, after cooling, add 100ml of 2% dodecyl Sodium alkylbenzene sulfonate was used as emulsifier, sonicated for 25 minutes, then 4.5 g of acrylic acid monomer was added to continue ultrasonic dispersion for 10 minutes to increase the stability of the system, and then magnetically stirred for 2 hours to prepare an O / W emulsified system;

[0028] (3) Slowly add the prepolymer prepared in step (1)...

Embodiment 2

[0030] (1) Preparation of prepolymer, weigh 1.9g urea, dissolve in 8ml deionized water, transfer to a three-necked flask, add weighed 18.5g formaldehyde solution (containing 1.85g formaldehyde) while stirring, and then add three Adjust the pH to 8.5 with ethanolamine, slowly raise the temperature to 75°C, react with magnetic stirring for 1 hour, cool to room temperature, and stir magnetically for 1 hour to obtain a urea-formaldehyde prepolymer;

[0031] (2) Add 0.8g of spirooxazine photochromic compound and 20ml of dioctyl phthalate into a round bottom flask, heat to 80°C and stir until completely dissolved, after cooling, add 100ml of styrene with a mass fraction of 2% Maleic anhydride was used as an emulsifier, sonicated for 25 minutes, then 4.5 g of acrylic acid monomer was added to continue ultrasonic dispersion for 10 minutes to increase the stability of the system, and then magnetically stirred for 2 hours to prepare an O / W emulsified system;

[0032] (3) Slowly add the ...

Embodiment 3

[0034] (1) Preparation of prepolymer, weigh 2.1g urea, dissolve in 10ml deionized water, transfer to a three-necked flask, add weighed 18.5g formaldehyde solution (containing 1.85g formaldehyde) while stirring, then add three Adjust the pH to 8.5 with ethanolamine, slowly raise the temperature to 75°C, react with magnetic stirring for 1 hour, cool to room temperature, and stir magnetically for 1 hour to obtain a urea-formaldehyde prepolymer;

[0035] (2) Add 1g of benzopyran photochromic compound and 20ml of dioctyl phthalate into a round bottom flask, heat to 80°C and stir until completely dissolved. After cooling, add 100ml of Span80 with a mass fraction of 2%. Emulsifier, ultrasonic for 25 minutes, then add 4.5g of acrylic acid monomer and continue ultrasonic dispersion for 10 minutes to increase the stability of the system, and then magnetically stir for 2 hours to prepare an O / W emulsification system;

[0036] (3) Slowly add the prepolymer prepared in step (1) dropwise in...

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Abstract

The invention discloses a urea formaldehyde photochromic microcapsule and a preparation method thereof. The preparation method comprises the following steps: first step, polymerizing urea and formaldehyde to generate a urea formaldehyde prepolymer; and second step, by in-situ polymerization, polymerizing the prepolymer on a water-oil interface to wrap a photochromic compound to form the urea formaldehyde photochromic microcapsule. By the in-situ polymerization, a photochromic compound is used as a core material, and urea formaldehyde resin is used as a wall material to prepare the urea formaldehyde photochromic microcapsule. The method is simple to operate, the chemical resistance of the photochromic material can be improved remarkably, the color performance is improved, the color changinglife is prolonged, the reversible color changing times are increased, and the urea formaldehyde photochromic microcapsule can be used for anti-fake, military camouflage, photoelectric information storage materials, intelligent textiles and other industries.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a preparation method of urea-formaldehyde photochromic microcapsules and the urea-formaldehyde photochromic microcapsules. Background technique [0002] Photochromic compound is a kind of compound that can produce isomeric changes under the irradiation of a certain wavelength of light, quickly change the absorption spectrum into a bright color, and can recover under the action of another wavelength of light or heating. original structure. Photochromic compounds are easily affected by environmental factors such as pH, temperature, light, and oxidation, which lead to oxidative fission in the external environment, poor fatigue resistance under repeated irradiation, and loss of reversible discoloration and Discoloration and color depth weakened. Most photochromic compounds are not compatible with fibers, and can only be fixed on fibers by the embedding effect of adhesiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/14C09K9/02C08G12/12
Inventor 王潮霞王婷薛琪吴飞扬张妍妍殷允杰陈坤林
Owner JIANGNAN UNIV
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