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A kind of preparation method of polyurethane-chitosan double-shell photochromic microcapsules

A photochromic, polyurethane prepolymer technology, applied in the chemical industry, can solve problems such as formaldehyde, and achieve the effect of improving fatigue resistance

Active Publication Date: 2017-05-17
浙江技立新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The photosensitive microcapsules of this invention can be used for information recording, and the microcapsule wall material has high mechanical strength, but the polyurea-polyurethane copolymer containing double bonds also has the problem of formaldehyde

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1) Dissolve 0.6g of 1,3,3-trimethyl-2-methyleneindoline in 250mL of butyl acetate, stir well and transfer to a three-necked flask, and successively add 0.2g of 1,6-hexamethylene diisocyanate , 1.8g PEG600, 3.8g Tween80 and 0.8g stannous octoate were added to the photochromic solution to initiate in-situ polymerization to generate polyurethane prepolymer; 0.5g1,4-butanediol was added to polyurethane prepolymer solution Neutralize and heat to 90°C for chain extension reaction to form a polyurethane inner wall shell, and the resulting coating is purified, washed and dried;

[0020] 2) Dissolve 1wt% chitosan in 250mL of 3.0wt% citric acid solution, and stir until the solution is transparent, mix 2.5g of the coating obtained in step 1) with 130mL of 1.0wt% Tween21 solution, and stir at high speed After 30 minutes, add it to the chitosan solution, after high-speed emulsification, add it to 300mL liquid paraffin containing 10wt% Tween80 at 60°C, and continue high-speed emulsif...

Embodiment 2

[0023] 1) Dissolve 0.8g 3,3-dimethyl-N-ethyl-5-chloro-6,-bromo-8,-nitrobenzospiropyran in 280mL butyl acetate, stir well and transfer to three In the flask, 0.8g of isophorone diisocyanate, 2.0g of PEG400, 4.5g of alkylphenol polyoxyethylene ether and 0.8g of stannous octoate were added to the photochromic solution in order to initiate in situ polymerization to generate polyurethane pre- polymer; 0.64g of propylene glycol is added to the polyurethane prepolymer solution and heated to 90°C for chain extension reaction to form a polyurethane inner wall shell, and the resulting coating is purified, washed and dried;

[0024] 2) 1.5wt% chitosan was dissolved in 280mL3.0wt% citric acid solution, and stirred until the solution was transparent, and 3.0g of the coating obtained in step 1) was dispersed in 150mL1.2wt% Tween85 solution, After high-speed stirring for 30 minutes, add it to the chitosan solution, after high-speed emulsification, add it to 300mL liquid paraffin containing 1...

Embodiment 3

[0027] 1) Dissolve 1.0g of p-acetamido-cis-azobenzene in 300mL of butyl acetate, stir evenly and transfer to a three-necked flask, successively add 3.0g of toluene diisocyanate, 2.4g of PEG600, 5.0g of polyvinyl alcohol and 0.9g of stannous octoate was added to the photochromic solution to initiate in-situ polymerization to form a polyurethane prepolymer; 0.7g of hydroquinone diether was added to the polyurethane prepolymer solution and heated to 90°C for a chain extension reaction to form polyurethane the inner wall shell, the resulting cladding is purified, washed and dried;

[0028] 2) Dissolve 2wt% of chitosan in 350mL of 3.0wt% citric acid solution, and stir until the solution is transparent, disperse 3.5g of the coating obtained in step 1) in 180mL of 1.5wt% Span20 solution, at high speed After stirring for 30 minutes, add it to the chitosan solution, after high-speed emulsification, add it to 300mL liquid paraffin containing 12wt% Tween80 at 60°C, and continue high-spee...

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PUM

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Abstract

The invention relates to a preparation method of polyurethane-chitosan double-hull photochromic microcapsules, and belongs to the field of chemical engineering. The polyurethane-chitosan double-hull photochromic microcapsules are prepared by taking a photochromic compound as a core material, taking polyurethane as an inner layer wall material, and taking chitosan as an outer layer wall material by an in-situ polymerization method. The method is simple to operate, is high in coating rate, is healthy, protects the environment, has no formaldehyde, can improve the fatigue resistance of photochromic materials, prolongs the service life, increases the reversible photochromic times, and can be used for the technical fields of functional textiles, clothes, counterfeit prevention and the like.

Description

technical field [0001] The invention relates to a preparation method of polyurethane-chitosan double-shell photochromic microcapsules, belonging to the field of chemical industry. Background technique [0002] Photochromism is a photochemical reaction of a substance under appropriate light conditions, resulting in a change in the absorption spectrum of the material, which returns to its original state under the action of heating or other photon excitation. Photochromic compounds are easily affected by pH value, oxidation, light and temperature, resulting in poor photochemical fatigue and degradation and deterioration after repeated irradiation, losing reversible photochromic properties or color depth weakened. In addition, irradiation intensity and time also have an effect on fatigue. [0003] Coating the photochromic compound can solve the aforementioned problem of poor fatigue resistance. Patent ZL200810057392 discloses a preparation method of photochromic microcapsules...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/18C08G18/10C09K9/02
Inventor 王潮霞范菲殷允杰张婉冒海燕
Owner 浙江技立新材料股份有限公司
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