A long weather-resistant microencapsulated photochromic powder and its preparation method

A microencapsulation and photochromic technology, applied in microcapsule preparation, microsphere preparation, dyeing method, etc., can solve the problems of poor weather resistance and acid resistance of single-layer microencapsulated photochromic powder

Active Publication Date: 2021-04-23
TIANJIN UVOS TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the technical problem of poor weather resistance and acid resistance of the existing single-layer microencapsulated photochromic powder, and to provide a method of encapsulating light stabilizers and photochromic materials into polyurethane / melamine resin microcapsules The preparation method of long weather-resistant microencapsulated photochromic powder can greatly improve the weather resistance and acid resistance of photochromic powder

Method used

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  • A long weather-resistant microencapsulated photochromic powder and its preparation method
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  • A long weather-resistant microencapsulated photochromic powder and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0109] Long weather resistance microencapsulated photochromic powder, including the following components:

[0110]

[0111] MOCA: English name 3,3,-dichloro-4,4,-diamino-diphenylmethane.

[0112] The photochromic compound dye is spirooxazine (Nankai University Fine Chemical Experimental Factory, melting point 145° C., decomposition temperature 260° C.).

[0113] The preparation method of the long weather-resistant microencapsulated photochromic powder is:

[0114] 1) Preparation of core material: Add photochromic material, light stabilizer, and crosslinking agent to the organic solvent according to the weight ratio, heat to 140°C, stir to dissolve, cool down to below 20°C, add water-based isocyanate prepolymer into the cooling material, fully stirred evenly to obtain a core material solution.

[0115] 2) Emulsification: add the core material solution to an appropriate amount of 3% neutral emulsifier solution, emulsify at a low speed for a certain period of time, and contr...

Embodiment 2

[0123] Long weather resistance microencapsulated photochromic powder, including the following components:

[0124]

[0125] The photochromic compound is selected from quinolino-spirooxazine photochromic compounds.

[0126] The above-mentioned preparation method of long weather-resistant microencapsulated photochromic powder comprises the following steps:

[0127] 1) Core material preparation: add photochromic material, light stabilizer, polyester polyol, and crosslinking agent to the organic solvent according to the weight ratio, heat to 120°C, stir to dissolve, cool down to below 20°C, and water-based The isocyanate prepolymer is added into the cooling material, and fully stirred evenly to obtain a core material solution.

[0128] 2) Emulsification: add the core material solution to an appropriate amount of 3% neutral emulsifier solution, emulsify at a low speed for a certain period of time, and control the emulsification temperature at 20-25°C to obtain an O / W emulsion w...

Embodiment 3

[0136] The long weather-resistant microencapsulated photochromic powder of the present embodiment 3 comprises the following components:

[0137]

[0138] The photochromic compound is selected from aryl-substituted naphthopyran photochromic compound.

[0139] The above-mentioned preparation method of long weather-resistant microencapsulated photochromic powder comprises the following steps:

[0140] 1) Core material preparation: add photochromic material, light stabilizer, polyester polyol, and crosslinking agent to the organic solvent according to the weight ratio, heat to 130°C, stir to dissolve, cool down to below 20°C, and water-based The isocyanate prepolymer is added into the cooling material, and fully stirred evenly to obtain a core material solution.

[0141] 2) Emulsification: add the core material solution to an appropriate amount of 3% neutral emulsifier solution, emulsify at a low speed for a certain period of time, and control the emulsification temperature at...

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Abstract

The invention relates to the field of photochromic materials, and specifically provides a long weather-resistant microencapsulated photochromic powder, which has a polyurethane / melamine resin double-layer microcapsule shell, and the shell is packed with a photochromic material and a stabilizer. Using the neutral system of in-situ polymerization of polyurethane, the alkaline light stabilizer and photochromic material are encapsulated into polyurethane microcapsules to form transparent microcapsules coated with polyurethane. Afterwards, the pH value of the emulsion was adjusted to be acidic, and melamine resin prepolymer was added to finally obtain a long-lasting weather-resistant microencapsulated photochromic powder. The weather resistance was increased by more than five times, and the acid resistance was also increased several times. Using this photochromic powder to prepare clothes printed and dyed with printing paste, the service life of discoloration has been increased by more than ten times. While improving weather resistance and acid resistance, it also maintains the original micron particle size of the toner, excellent dispersibility, and compatibility with the toner. Amphiphilic solubility and full color development of different pastes.

Description

technical field [0001] The invention relates to the field of photochromic materials, in particular to a long weather-resistant microencapsulated photochromic powder and a preparation method thereof. Background technique [0002] Photochromic materials have the characteristics of sensitive color change and bright color, but they are easily affected by environmental factors such as temperature, light, pH value and oxygen, resulting in oxidative deterioration and poor fatigue resistance. The earliest and easiest way to combine photochromic materials with fabrics is printing and dyeing techniques. This technology makes the photochromic material directly exposed to the external environment, resulting in shortened discoloration life and failure of discoloration performance. With the rapid development of microcapsule technology, the photochromic material is coated inside the transparent microcapsule to separate it from air, impurities, acid and alkali chemical environments, and im...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06P1/44B01J13/18
CPCB01J13/185D06P1/445
Inventor 吴边鹏孟继本张丽鑫边俊民
Owner TIANJIN UVOS TECH CO LTD
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