Modified long-acting photochromic microcapsule, preparation method, photochromic dye printing paste containing modified long-acting photochromic microcapsule and application
A photochromic dye and photochromic technology, applied in the field of clothing fabrics, can solve the problems of photochromic material failure, service life, background color, photochromic material failure, etc. Dispersibility and stability, avoiding the effect of uneven color
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[0070] Example 1
[0071] A modified long-acting photochromic microcapsule is alumina-coated photochromic microcapsule, and the preparation method is as follows:
[0072] 1) Mix 30 g of photochromic microcapsules and 40 g of water, add 5 g of sodium hexametaphosphate to the above mixing system, mix at 60°C for 30 minutes, and adjust the pH to 7.0 to obtain a mixed solution;
[0073] 2) Add 10g of sodium metaaluminate to the mixed solution obtained in step 1), titrate with a 1mol / L sulfuric acid solution, add sodium hydroxide to adjust the pH to 9.5 after the titration is completed, and age at 62°C for 2h. The solution after conversion is suction filtered in a Buchner funnel, and the block powder obtained by suction filtering is cooled to 30°C, firstly pulverized by a high-speed pulverizer, and then finely pulverized by a jet pulverizer to obtain the modified Long-lasting photochromic microcapsules.
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[0074] Example 2-3
[0075] The difference from Example 1 is that, in this example, the added amount of the photochromic microcapsules is 10 g (Example 2) and 50 g (Example 3).
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[0076] Example 4-5
[0077] The difference from Example 1 is that in this example, the added amount of the sodium metaaluminate is 3g (Example 4) and 30g (Example 5).
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