Preparation method of liquid crystal microcapsules used for textile printing

A technology of microcapsules and textiles, applied in the fields of fine chemicals and materials science, can solve problems such as not suitable for textile processing, poor compatibility of textiles, unfavorable modification, etc., achieve bright color rendering, meet the requirements of individuality and diversity, Structural controllable effects

Active Publication Date: 2018-05-18
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that most of the materials used in the preparation of microcapsules by complex coacervation are natural polymers. However, such natural polymers have complex structures, are not conducive to modification, and have poor compatibility with textiles. Therefore, they are not suitable for textiles. processing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Mix 3g of cholesteryl nonanoate and 7g of cholesteryl oleyl carbonate and heat until just completely dissolved and become transparent. After stirring at this temperature for 2 hours, cool down until the mixed liquid crystal appears color or turbid, then heat up to just transparent, and keep the temperature Stir for 4h to obtain mixed liquid crystals.

[0019] Keep the obtained mixed liquid crystal at the clearing point temperature, and add it dropwise to 70 g of an aqueous solution containing 10 g of polyacrylic acid at the same temperature under the action of mechanical stirring, emulsify at high speed for 20 minutes to form a uniform liquid crystal dispersion, and slowly add 20 g of it containing 10 g of cations For aqueous solution of polyacrylamide, slowly adjust the pH to 4.0, react for 60 minutes, lower the temperature to below 10°C, adjust the pH to 8.5 after stirring for 30 minutes, keep the temperature and react for 1 hour, repeat centrifugal filtration after th...

Embodiment 2

[0021] Mix 1g of cholesteryl propionate, 1.5g of cholesteryl oleate, 2g of cholesteryl benzoate, and 0.5g of cholesteryl ethyl carbonate and heat until just completely dissolved. Stir at this temperature for 3 hours, then cool down to the mixing After the color or turbidity of the liquid crystal appears, the temperature is raised until it is just transparent, and stirred at constant temperature for 5 hours to obtain the mixed liquid crystal.

[0022] Keep the obtained mixed liquid crystal at the temperature of the clearing point, add it dropwise to an aqueous solution containing 0.5g OP-10 and 2g polymethacrylate at the same temperature under mechanical stirring, and form 80g liquid crystal dispersion after high-speed emulsification for 30min; mix 20g Add an aqueous solution containing 2g of cationic polyacrylamide dropwise to the liquid crystal dispersion, continue to emulsify for 30 minutes, adjust the pH to 6, and react for 120 minutes. After the reaction is complete, repeat...

Embodiment 3

[0024] Mix 2.5g of cholesteryl carbonate, 4g of cholesteryl oleate, and 1g of cholesteryl chloride and heat until they are completely dissolved. After stirring for 3 hours at this temperature, cool down until the mixed liquid crystal appears color or turbid, and then heat up to Just transparent, stirring at constant temperature for 5h, that is, mixed liquid crystal.

[0025] Keep the obtained mixed liquid crystal at the temperature of clearing point and add it dropwise to the aqueous solution containing 2g Tween80 and 2g polyacrylic acid under the action of mechanical stirring, and form 80g liquid crystal dispersion after high-speed emulsification for 10min; 20g containing 2g polyvinylamine Add the aqueous solution to the liquid crystal dispersion drop by drop, continue to emulsify for 10 minutes, adjust the pH to 3, and react for 20 minutes. After the reaction is complete, repeatedly centrifuge and filter, and dry to obtain liquid crystal microcapsules. The particle size of t...

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Abstract

The invention discloses a preparation method of liquid crystal microcapsules used for textile printing, and belongs to the technical fields of fine chemical engineering and material science and technology. A synthetic polymeric compound is adopted to replace natural polymer. A polymeric compound which is well compatible to textiles is selected and is taken as a shell material, and the structure ofthe shell material is adjusted to prepare crystal microcapsules suitable for textiles. The method is high in yield and free of organic solvents, and an initiator isn't required in a coating process of microcapsules. The wall material of the liquid crystal microcapsules is good in transparency. The liquid crystal microcapsules are bright-coloured, are controllable in structure, and are suitable for meeting the textile requirement.

Description

technical field [0001] The invention relates to a method for preparing liquid crystal microcapsules for textile printing, which belongs to the technical fields of fine chemical industry and material science. Background technique [0002] Cholesteric liquid crystal is an organic reversible color-reversing material, which has the advantages of fast response speed, high color-changing sensitivity, bright color, rich color-changing layers, and good light stability. Cholesteric liquid crystal has no chromophoric group, but it has a helical structure in spatial structure. When light of different wavelengths is incident on cholesteric liquid crystal, most of the light will be transmitted with a certain optical rotation, and a small part Light with a wavelength equal to the pitch is reflected back, giving cholesteric liquid crystals their characteristic optical color. In addition, it belongs to biomass itself, which is harmless to the human body and has the advantage of biocompatib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06P1/651D06P1/52B01J13/02
CPCB01J13/02D06P1/5242D06P1/525D06P1/5257D06P1/65125D06P1/65156
Inventor 付少海张丽平关玉王春霞李敏
Owner JIANGNAN UNIV
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