Method for preparing core-shell reversible heat-sensitive temperature indicating composite microspheres

A composite microsphere, core-shell type technology, applied in the direction of microsphere preparation, microcapsule preparation, etc., can solve the problems of strict performance and experimental conditions, low mechanical strength, shell breaking phenomenon, etc., to achieve good temperature display performance, mechanical The effect of high strength and easy control of particle size

Inactive Publication Date: 2012-09-12
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to avoid the deficiencies of the prior art, the present invention proposes a method for preparing a core-shell reversible thermosensitive temperature-indicating composite microsphere to solve the problem of the temperature-indicating microcaps

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Add 0.3gMCM-41 silicon-based mesoporous microspheres to 15ml with a concentration of 0.5g·ml -1 CoCl 2 In an aqueous solution, after being adsorbed for 2 hours, centrifuged and dried in vacuum, the reversible thermosensitive temperature-indicating microspheres (S) are prepared. MCM-41 Silica-based Mesoporous Microspheres and CoCl 2 The dosage ratio is 1:25 (mass ratio). Get emulsifier Span800.25ml, join in 5ml hexanaphthene according to volume ratio 1: 20, make oily phase (O 1 ). Get the prepared reversible thermosensitive microspheres (S) of step (a) and join in the oil phase (O 1 ), making a stable S / O 1 lotion. Prepare a polyvinyl alcohol aqueous solution with a concentration of 0.8% (g / g), adjust the acidity with concentrated hydrochloric acid, and make the pH less than 2. Add 1 ml of Tween80 to 20 ml of the polyvinyl alcohol aqueous solution to form a water phase (W), and the volume ratio of the emulsifier Tween80 to the polyvinyl alcohol aqueous ...

Embodiment 2

[0023] Example 2: Add 0.2gMCM-41 silicon-based mesoporous microspheres to 10ml with a concentration of 0.5g·ml -1 CoCl 2 In an aqueous solution, after being adsorbed for 2 hours, centrifuged and dried in vacuum, the reversible thermosensitive temperature-indicating microspheres (S) are prepared. MCM-41 Silica-based Mesoporous Microspheres and CoCl 2 The dosage ratio is 1:25 (mass ratio). Get emulsifier Span800.25ml, join in 5ml hexanaphthene according to volume ratio 1: 20, make oily phase (O 1 ). Get the prepared reversible thermosensitive microspheres (S) of step (a) and join in the oil phase (O 1 ), making a stable S / O 1 lotion. Prepare a polyvinyl alcohol aqueous solution with a concentration of 0.9% (g / g), adjust the acidity with concentrated hydrochloric acid, and make the pH less than 2. Add 1 ml of Tween80 to 20 ml of the polyvinyl alcohol aqueous solution to form a water phase (W), and the volume ratio of the emulsifier Tween80 to the polyvinyl alcohol aqueous ...

Embodiment 3

[0025] Example 3: Add 0.2gMCM-41 silicon-based mesoporous microspheres to 10ml with a concentration of 0.5g·ml -1 CoCl 2 In an aqueous solution, after being adsorbed for 1 hour, centrifuged and vacuum-dried to prepare reversible thermosensitive temperature-indicating microspheres (S). MCM-41 Silica-based Mesoporous Microspheres and CoCl 2 The dosage ratio is 1:25 (mass ratio). Get emulsifier Span800.25ml, join in 5ml hexanaphthene according to volume ratio 1: 20, make oily phase (O 1 ). Get the prepared reversible thermosensitive microspheres (S) of step (a) and join in the oil phase (O 1 ), making a stable S / O 1 lotion. Prepare a polyvinyl alcohol aqueous solution with a concentration of 0.8% (g / g), adjust the acidity with concentrated hydrochloric acid, and make the pH less than 2. 1ml Tween80 was added to 25ml of the polyvinyl alcohol aqueous solution to make the water phase (W), and the volume ratio of the emulsifier Tween80 to the polyvinyl alcohol aqueous solution...

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Abstract

The invention relates to a method for preparing core-shell reversible heat-sensitive temperature indicating composite microspheres. The method is characterized by comprising the following steps of: adding MCM-41 silicon-based mesoporous microspheres into a CoCl2 aqueous solution to prepare reversible heat-sensitive temperature indicating microspheres, and adding an emulsifier Span80 into cyclohexane to prepare an oil phase; adding the reversible heat-sensitive temperature indicating microspheres into the oil phase to prepare S/O1 emulsion; adding an emulsifier Tween80 into a polyvinyl alcohol aqueous solution to prepare a water phase; dripping the S/O1 emulsion into the water phase to prepare S/O1/W inner emulsion; adding the emulsifier Span80 into the cyclohexane to prepare a dispersed phase, and dripping the S/O1/W inner emulsion and a cross-linking agent glutaraldehyde into the dispersed phase to prepare S/O1/W/O2 composite emulsion; and reacting the composite emulsion with stirring, performing suction filtering, washing, and drying to obtain the core-shell reversible heat-sensitive temperature indicating composite microspheres. The microspheres sensitively indicate temperature and are high in reversibility, environmental adaptability and reusability.

Description

technical field [0001] The invention relates to the technical field of functional materials, in particular to a method for preparing a core-shell reversible thermosensitive temperature-indicating composite microsphere, which is an inorganic reversible thermosensitive temperature-indicating material cobalt chloride hexahydrate (CoCl 2 ·6H 2 O) preparation method of core-shell composite microspheres. Background technique [0002] Since the 1980s, the development of temperature-indicating materials tends to be low temperature and reversible. In particular, inorganic reversible thermosensitive temperature-indicating materials are widely used in many fields such as industry, publishing and printing, textile and clothing, medical treatment and daily life because of their advantages such as good thermochromism and reversibility, bright colors, simple synthesis process, and low cost. application prospects. where CoCl 2 ·6H 2 O is a very representative low temperature inorganic ...

Claims

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Application Information

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IPC IPC(8): B01J13/02
Inventor 管萍胡小玲李晓倩郜捷
Owner NORTHWESTERN POLYTECHNICAL UNIV
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