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A kind of stable formaldehyde-free photosensitive microcapsule and preparation method thereof

A stable, microcapsule technology, used in microcapsule preparations, microsphere preparation, chemical instruments and methods, etc., can solve the problems of difficult application of electronic equipment, reduced protection ability, aging decomposition, etc., and achieves good light transmission performance, good Effects of thermal stability, good mechanical properties

Active Publication Date: 2022-07-29
武汉中科先进材料科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since photosensitive microcapsules are often used in surface coatings and electronic equipment, the scratch resistance, extrusion performance and temperature resistance of the wall material are particularly important. When preparing traditional photosensitive microcapsules, melamine-formaldehyde resin and urea-formaldehyde resin are usually selected. As a wall material, although this type of low-cost resin can provide excellent mechanical properties to protect the microcapsules from rupture and failure due to external factors, it will produce a large amount of aldehydes that are harmful to health, and will rapidly age and decompose in an environment exceeding 150 °C And then lose the original function; while the core material simply melts and disperses the photochromic material into the inert diluent, once the wall material is damaged and broken, the photochromic material will be lost quickly, and the microcapsules will lose their effect
[0005] Chinese patent CN109876743A application discloses a photosensitive microcapsule containing a photosensitive color-changing material and its preparation method and application. The photosensitive microcapsule selects acrylate monomer or acrylate epoxy resin to synthesize polyacrylate or epoxy resin capsule wall. Although these substances can provide good mechanical properties at room temperature, their glass transition temperature (Tg) is low. When the temperature exceeds 120 °C, the capsule wall will rapidly soften and adhere to even rupture, which reduces the protection ability at high temperature. Difficult to apply to electronic equipment that needs to be exposed to high temperature for a long time

Method used

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  • A kind of stable formaldehyde-free photosensitive microcapsule and preparation method thereof
  • A kind of stable formaldehyde-free photosensitive microcapsule and preparation method thereof
  • A kind of stable formaldehyde-free photosensitive microcapsule and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] After the isocyanate-terminated polyurethane prepolymer with an average macromolecular weight of 5,000 was completely dehydrated, 100 g of it was weighed and put into a three-necked flask. After the siloxane was completely dehydrated, 3.1 g of it was weighed and slowly added dropwise, and the wall material prepolymer was obtained by reacting for several hours.

[0032] After the prepolymer of the wall material was lowered to room temperature, 3.2 g of diarylethene was weighed and fully dispersed in 30g of 200# solvent oil, stirred and heated to 170°C to make the diarylene completely melted, cooled to room temperature, and then added with UV light. 6 g of absorbent, 25.3 g of E51 epoxy resin, 21.5 g of methyltetrahydrophthalic anhydride, and 25 g of wall material prepolymer are fully stirred and uniform.

[0033]The above-mentioned oil phase solution was added to the aqueous solution of the styrene-maleic anhydride block copolymer and stirred at high speed to form an oil...

Embodiment 2

[0036] After the isocyanate-terminated polyurethane prepolymer with an average macromolecular weight of 10,000 was completely dehydrated, 200 g of it was weighed and put into a three-necked flask. After the siloxane was completely dehydrated, 5.3 g of it was weighed and slowly added dropwise, and the wall material prepolymer was obtained by reacting for several hours.

[0037] After the prepolymer of the wall material was lowered to room temperature, 1.6 g of diarylene was weighed and fully dispersed in 20g of 200# solvent oil, stirred and heated to 170°C to completely melt the diarylene and cooled to room temperature, and then added UV light. 1 g of absorbent, 30.8 g of E51 epoxy resin, 27.6 g of methyltetrahydrophthalic anhydride, and 30 g of wall material prepolymer are fully stirred and uniform.

[0038] The above-mentioned oil phase solution was added to the aqueous solution of the styrene-maleic anhydride block copolymer and stirred at high speed to form an oil-in-water ...

Embodiment 3

[0040] After the isocyanate-terminated polyurethane prepolymer with an average macromolecular weight of 2500 was completely dehydrated, 100 g of it was weighed and put into a three-necked flask. After the siloxane was completely dehydrated, 8.84 g of it was weighed and slowly added dropwise, and the wall material prepolymer was obtained by reacting for several hours.

[0041] After the prepolymer of the wall material was lowered to room temperature, 1.6 g of heterocyclic azobenzene was weighed and fully dispersed in 20 g of 200# solvent oil, stirred and heated to 150°C to completely melt the heterocyclic azobenzene, and then cooled to room temperature. Add 1 g of UV absorber, 30.8 g of E51 epoxy resin, 27.6 g of methyltetrahydrophthalic anhydride, and 30 g of wall material prepolymer and stir well.

[0042] The above-mentioned oil phase solution is added to the aqueous solution of the styrene-maleic anhydride block copolymer and stirred at high speed to form an oil-in-water O / ...

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Abstract

The invention relates to a stable formaldehyde-free photosensitive microcapsule and a preparation method thereof. The formaldehyde-free photosensitive microcapsule of the present invention is composed of a capsule wall and a capsule core, and the capsule wall material is a wall material, and a polyurea-polyurethane copolymer modified by polysiloxane is used. The core material of the capsule is a core material, and a photochromic polymer material or a photochromic polymer, an epoxy resin copolymer, an ultraviolet absorber and an inert diluent are used. The invention also provides a preparation method of stable aldehyde-free photosensitive microcapsules, which is simple and easy to operate, and the prepared stable aldehyde-free photosensitive microcapsules have good light transmittance, good color rendering effect, and excellent mechanical and mechanical properties. It can ensure the integrity of the microcapsules under the impact of high temperature, and also has good thermal stability, no deformation, adhesion and leakage in high temperature environment, and still has good discoloration performance after long-term ultraviolet irradiation and repeated discoloration.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a stable formaldehyde-free photosensitive microcapsule containing a photochromic material and a preparation method thereof. Background technique [0002] Photochromism refers to the reversible transition process of certain chemical substances between two states with different colors after being excited by light. For example: photochromic reactions of azobenzenes, fulgides, spiropyrans, spirooxazines, diarylethenes and several new organic photochromic materials, among which the diarylethene system has Extremely high thermal stability, excellent fatigue resistance, and significant differences in physical and chemical properties between different isomer states make it one of the most promising photochromic systems at present. Photochromic materials belong to photosensitive materials in the field of new materials, and are mainly used in three aspects: optical m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D7/65C09K9/02B01J13/14B01J13/02
CPCC09D7/65C09D7/70C09K9/02B01J13/02B01J13/14
Inventor 康翼鸿喻学锋刘海生邓宇昊
Owner 武汉中科先进材料科技有限公司