A kind of preparation method of high-sensitivity temperature-sensitive reversible color-changing microcapsules

A technology of microcapsules and color-changing dyes, applied in the field of material science, can solve the problems of limiting the application and development of dyes with high sensitivity and rapid response, color lag, color change lag, etc., and achieves good color performance, improved color lag, and color-changing response performance. excellent effect

Active Publication Date: 2022-05-20
JIANGNAN UNIV +1
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although this type of thermochromic material has been widely studied and applied, there is still a color hysteresis phenomenon in the process of color change (that is, the color change lags behind the temperature change during the cooling process), which limits the use of such dyes in high sensitivity and Application and development of rapid response

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of preparation method of high-sensitivity temperature-sensitive reversible color-changing microcapsules
  • A kind of preparation method of high-sensitivity temperature-sensitive reversible color-changing microcapsules
  • A kind of preparation method of high-sensitivity temperature-sensitive reversible color-changing microcapsules

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Preparation of No. 6 novel fluoran dye: 50mmol 3-(diethylamino)phenol and 25mmol 3-nitrophthalic anhydride were added to a three-necked flask containing 50mL chlorobenzene, and after completely dissolving, 25mmol trifluoromethane was added sulfonic acid. Then put the three-neck flask into a 135°C oil bath to preheat, and react under nitrogen reflux for 2 days. After the reaction is completed, cool to room temperature, and remove the solvent by rotary evaporation. Using dichloromethane (DCM) / methanol as eluent for column chromatography, a purple powder was obtained, the product ph-NO 2 .

[0037] 1 mmol ph-NO 2 , 20mg Pd / C, 4mL ethyl acetate (EtOAc), put into a three-necked flask. 1.5 mmol H 3 PO 2 and 4.5 mmol NaH 2 PO 2 ·H 2 O was homogeneously dissolved in 4 mL of H 2 After being placed in O, it was poured into the above-mentioned three-neck flask. Then the three-neck flask was put into an oil bath at 85°C for 5 hours, cooled to room temperature, and extract...

Embodiment 2

[0058] Embodiment 2 adopts No. 6 novel fluoran dye identical with embodiment 1.

[0059] Preparation of fuchsia two-component temperature-sensitive reversible color dye compound: No. 6 new fluorane dye (0.1g), 15g cetyl alcohol, magnetic stirring for 1 hour at 50°C, to obtain uniformly mixed fuchsia Two-component thermosensitive reversible color dye complex.

[0060] Preparation of fuchsia two-component temperature-sensitive reversible discoloration microcapsules: take 1.5 g of fuchsia two-component temperature-sensitive reversible discoloration dye complex and 0.75 g polymethyl methacrylate dissolved in 5 mL dichloromethane ( DCM), then add an emulsifier aqueous solution (2%, 1.0 g gelatin mixed in 49 mL water), and stir at 5000 r / min for 20 min at room temperature to form an O / W emulsion. Pour the O / W emulsion into a beaker, and stir at a speed of 400 r / min for 8 hours at 35°C until the DCM is completely volatilized. After adding deionized water and standing still, decant ...

Embodiment 3

[0068] Preparation of No. 2 novel fluoran dye: dissolve 3-diethylaminophenol (1.65g) and 3-nitrophthalic anhydride (2.89g) in toluene (25ml), put them into a three-necked flask, and put them in an oil bath at 110°C Pot reaction 4h, cooled to room temperature, extracted with a small amount of petroleum ether. The supernatant was removed to obtain a purple-red precipitate. Purify the precipitate by column chromatography using dichloromethane / methanol as the eluent to obtain a golden yellow powder, which is the product 4-diethylaminonitroketoacid.

[0069] Put 4-diethylaminonitroketo acid (intermediate M1) (2g) and concentrated sulfuric acid (15ml) into a three-neck flask, and dissolve the powder in an ice-water bath. Then, 4-methoxydiphenylamine (1.11 g) was put into the above-mentioned three-necked flask, and reacted at room temperature for 24 h. Afterwards, the product was slowly dropped into ice water to obtain a dark green precipitate, which was washed with water several t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention belongs to the technical field of material science, and in particular relates to a method for preparing high-sensitivity temperature-sensitive reversible discoloration microcapsules. The present invention designs and synthesizes a series of novel fluorane dyes, which can realize the color changing performance without a color developer, and compound it with a phase change material according to a certain ratio to prepare a series of two-component reversible temperature-sensitive color-changing dyes, and then adopt Two-component reversible thermochromic microcapsules with good color performance and color change response were prepared by solvent evaporation method. The two-component reversible thermochromic microcapsules of the present invention can effectively improve the color hysteresis of the traditional three-component thermochromic capsules.

Description

technical field [0001] The invention belongs to the technical field of material science, and in particular relates to a temperature-sensitive reversible discoloration dye and a preparation method of microcapsules. Background technique [0002] Thermochromic materials are divided into two categories: irreversible thermochromic and reversible thermochromic. Irreversible thermochromism is mainly due to the thermal decomposition of materials, as well as the color change caused by sublimation, melting, compound reaction, and redox reaction. It can only change color in one direction, and its practical application is limited. Inorganic reversible thermochromism is mainly due to the change of crystal structure, the gain and loss of crystal water, the electron transfer and the geometric configuration of the ligand. To a certain extent, its application is limited. There are two kinds of organic thermochromic materials, high molecule and small molecule. The typical representative of...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C07D493/10C09B57/00B01J13/02
CPCC07D493/10C09B57/00B01J13/02B01J13/125C09B11/24C09B67/0097
Inventor 付少海张丽平李晶晶王成成蒋晓军
Owner JIANGNAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap