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Spiropyran photochromic coating and preparation method thereof

A photochromic and spiropyran technology, applied in coatings, luminescent coatings, color-changing fluorescent materials, etc., can solve the problems of low color-changing efficiency, reduced color-changing coating space, and reduced color-changing space.

Active Publication Date: 2020-02-21
南京米兰达视光科学研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The spin coating method is to add the prepared discoloration solution into the tank of the spin coater after the substrate is made, and after fully mixing, fix the substrate on the spin coater for centrifugal rotation and solidify it to form a discoloration effect. Compared with the substrate method, the spin-coating method has the advantage of high technical content. In theory, any product can be made, and the color difference of the product is small. The disadvantage is that the space of the color-changing coating is relatively reduced, and the color-changing space is reduced. Therefore, the development of lens coating technology with high photochromic efficiency is an important development direction in the future

Method used

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  • Spiropyran photochromic coating and preparation method thereof
  • Spiropyran photochromic coating and preparation method thereof
  • Spiropyran photochromic coating and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0090] Embodiment 1: Preparation of photochromic nanocomposite microspheres, photochromic coating liquid and photochromic lens

[0091] (1) Preparation of photochromic nanocomposite microspheres:

[0092] (1) Add 9.7g of zinc nitrate hexahydrate to 1600g of ethylene glycol, stir evenly, add 1.6g of sublimated sulfur powder, heat up to 150°C for 24 hours, cool to 55°C, add 85g of mercaptoethanol dropwise and stir; Then add 6.7 g of the spiropyran photochromic compound represented by formula III, stir vigorously for 30 minutes, continue to cool to room temperature, filter and wash the precipitate, and dry it in a vacuum oven at 65°C for 8 hours to obtain spiropyran coating Zinc sulfide nanospheres;

[0093] (2) Add 8g of spiropyran-coated zinc sulfide nanospheres and 8.2g of diphenylmethane-4,4'-diisocyanate (MDI) to 1000g of butyl acetate solvent, stir well, and then add 7g to mix the reaction agent (1.2g n-butanol, 5.8g polytetrahydrofuran ether glycol), 18g Tween80, the tem...

Embodiment 2

[0108] (1) Preparation of photochromic nanocomposite microspheres:

[0109] (1) Add 6.5g of zinc nitrate to 1600g of ethylene glycol, stir evenly, add 1.7g of sublimated sulfur powder, heat up to 150°C for 24 hours, cool to 55°C, add 70g of mercaptoethanol dropwise and stir; then add 3.5 g of spiropyran photochromic compound (I), vigorously stirred for 30 minutes, cooled to room temperature, filtered and washed the precipitate, and dried in a vacuum oven at 65° C. for 8 hours to obtain spiropyran-coated zinc sulfide nanospheres;

[0110] (2) Get 5.5g spiropyran-coated zinc sulfide nanospheres, 5g MDI is added in 1000g butyl acetate solvent, after stirring evenly, add 5.5g mixed reactants (1.0g n-butanol, 4.5g polytetrahydrofuran ether) Diol), 20g Tween80, keep the temperature at 25°C, prepolymerize at 500r / min for 50min, add 6g chain extender (4.5g ethylene glycol, 1.5g ethylenediamine), 0.1g DBTL, heat to 65°C Polymerization chain extension reaction was carried out for 15 mi...

Embodiment 3

[0119] (1) Preparation of photochromic nanocomposite microspheres:

[0120] (1) Add 11g of zinc nitrate hexahydrate to 1600g of ethylene glycol, stir evenly, add 3g of sulfur powder, heat up to 145°C for 24 hours, cool to 50°C, add 92g of mercaptoethanol dropwise and stir; then add 8g The spiropyran photochromic compound (I), vigorously stirred for 35 minutes, continued to cool to room temperature, filtered and washed the precipitate, and dried in a vacuum oven at 60°C for 9 hours to obtain spiropyran-coated zinc sulfide nanospheres;

[0121] (2) Get 10g spiropyran-coated zinc sulfide nanospheres, 10.8g m-xylylene diisocyanate (XDI) and join in 1000g butyl acetate solvent, after stirring evenly, add 7.4g mixed reaction agent (1.0 g n-butanol, 6.4g polytetrahydrofuran ether glycol), 16g Tween80, keep the temperature at 25°C, prepolymerize at 600r / min for 60min, add 8g chain extender (5.5g ethylene glycol, 2.5g ethylenediamine) , 0.2g DBTL, heated to 60°C for polymerization cha...

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Abstract

A spiropyran-based photochromic coating and a preparation method thereof, the coating contains polyurethane / spiropyran / zinc sulfide composite multilayer photochromic material, the core of which is zinc sulfide mesoporous nano-microspheres, the middle layer It is a photochromic layer composed of spiropyran compounds, and the outer shell is polyurethane; the outer diameter of the composite microsphere is 50-350nm, wherein the diameter of the zinc sulfide mesoporous nano-microsphere is 30-250nm, and the thickness of the middle layer is 2 to 25 nm, and the thickness of the shell is 5 to 25 nm. The photochromic coating prepared by the method of the present invention can be used as the surface color-changing layer of optical color-changing materials or optical lenses, and the coating can change from colorless to colored under ultraviolet irradiation, and can quickly fade to Colorless, it has the advantages of strong fatigue resistance, good stability, and fast discoloration.

Description

technical field [0001] The invention belongs to the technical field of photochromism, and in particular relates to a photochromic coating containing spiropyran photochromic nanocomposite microspheres and a preparation method thereof. Background technique [0002] Photochromism refers to certain compounds under the action of light of a certain wavelength and intensity, as the absorption spectrum changes, the molecular structure of the material changes, resulting in a change in the absorbance and color of the material, and this change is generally reversible , a functional material that can automatically return to its original state when the light is stopped, as a new material in the subdivision of optical materials, it has important roles in high-tech fields such as optical lenses, optical information storage, molecular switches, and anti-counterfeiting identification. Value. It has been more than 100 years since human beings discovered the phenomenon of photochromism. The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D5/22C09D175/04C09K9/02G02B1/14
CPCC08K2003/3036C08K2201/011C08L2201/08C08L2205/025C08L2205/18C09D5/22C09D175/04C09K9/02C09K2211/1007C09K2211/1029C09K2211/1088G02B1/14C08L75/04C08K9/10C08K3/30
Inventor 王明华张鹤军范为正纪立军乔振安司云凤王志飞郑永华薛晓花吴潇刘洋
Owner 南京米兰达视光科学研究院有限公司
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