Gelatin chitosan-nano-silicon dioxide multi-core phase-change energy-storage microcapsule preparation method

A nano-silica, phase-change energy storage technology, applied in the field of medicine, achieves the effects of simple preparation method, increased affinity, and improved strength

Active Publication Date: 2017-11-24
YANAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Phase change microcapsules have the advantages of large heat transfer area, fast heat transfer speed, easy dispersion and strong applicability. However, with the rapid development of science and technology, ordinary phase change microcapsules can no longer meet the original application fields, such as textile, construction, Military and other high-density heat transfer needs

Method used

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  • Gelatin chitosan-nano-silicon dioxide multi-core phase-change energy-storage microcapsule preparation method
  • Gelatin chitosan-nano-silicon dioxide multi-core phase-change energy-storage microcapsule preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Step 1, dissolve 0.15g chitosan in 2% acetic acid solution to prepare 3g 5% chitosan solution, and add 0.0038g nano silicon dioxide to the chitosan solution, ultrasonically disperse for 30min to obtain chitosan Sugar / SiO 2 Dispersions;

[0033] Step 2, 0.15g gelatin is mixed with distilled water into 10% gelatin solution;

[0034] Step 3, mix 3g of paraffin with the chitosan / SiO obtained in step 1 2 Mix the solutions, add 0.18g Span80 as an emulsifier, and emulsify at 60°C and 2000r / min for 40min to form an emulsion;

[0035] Step 4, slowly add the gelatin solution in step 2 to the emulsion obtained in step 3, and at the same time add 0.0002 glutaraldehyde solution dropwise, stir and solidify at 60°C and 800r / min for 60min to obtain a composite microcapsule suspension;

[0036] In step 5, the composite microcapsule suspension obtained in step 4 is washed twice with n-hexane, ethanol and acetone in sequence, and dried to obtain solid powder of multi-nuclear phase chan...

Embodiment 2

[0039] Step 1, dissolve 0.15g chitosan in 2% acetic acid solution to prepare 3g 5% chitosan solution, and add 0.015g nano silicon dioxide to the chitosan solution, ultrasonically disperse for 30min to obtain chitosan Sugar / SiO 2 Dispersions;

[0040] Step 2, prepare 0.75g of gelatin with distilled water into a 10% gelatin solution, and add 0.0188g of nano silicon dioxide to the gelatin solution, and ultrasonically disperse for 30min to obtain gelatin / SiO 2 Dispersions;

[0041] Step 3, mix a mixture of 11.25 g paraffin and 3.75 g dodecanol with the chitosan / SiO from step 1 2 Mix the solutions, add 1.8g Span80 as an emulsifier, and emulsify at 50°C and 2000r / min for 60min to form an emulsion;

[0042] Step 4, the gelatin / SiO in step 2 2 The solution is slowly added dropwise to the emulsion obtained in step 3, and at the same time, 0.0038 glutaraldehyde solution is added dropwise, and the solidification reaction is stirred at 60°C and 800r / min for 120min to obtain a composit...

Embodiment 3

[0046] Step 1, dissolve 0.15g chitosan in 2% acetic acid solution to prepare 3g 5% chitosan solution;

[0047] In step 2, 0.3 g of gelatin was prepared into a 10% gelatin solution with distilled water, and 0.03 g of nano-silicon dioxide was added to the gelatin solution, and ultrasonically dispersed for 30 min to obtain gelatin / SiO 2 Dispersions;

[0048] Step 3, mix the mixture of 3g paraffin and 3g dodecanol with the chitosan / SiO from step 1 2 The solution was mixed, 0.369g Span80 was added to it as an emulsifier, and emulsified at 80°C and 2000r / min for 30min to form an emulsion;

[0049] Step 4, combine the gelatin / SiO from step 2 2 The solution was slowly added dropwise to the emulsion obtained in step 3, and 0.0009 g of glutaraldehyde solution was added dropwise at the same time, and the solidification reaction was stirred at 60 ° C and 800 r / min for 30 min to obtain a composite microcapsule suspension;

[0050] In step 5, the composite microcapsule suspension obtaine...

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Abstract

The invention discloses a gelatin chitosan-nano-silicon dioxide multi-core phase-change energy-storage microcapsule preparation method. The preparation method comprises the following steps: respectively preparing chitosan and gelatine into solutions, adding nano-silicon dioxide, performing ultrasonic dispersing to obtain chitosan / SiO2 and gelatine / SiO2 solution, then mixing a phase-change material and chitosan / SiO2, emulsifying with an emulsifying agent to form an emulsion, slowly adding the gelatine / SiO2 and a cross-linking agent into the emulsion dropwise, performing a curing reaction for a certain time, washing and drying to obtain microcapsule powder. According to the preparation method, two phase-change materials, namely, paraffin and dodecanol, are mixed, so that the prepared phase-change material has a wide phase-change temperature; the purpose of introducing nano-SiO2 into the chitosan or the gelatine serving as a microcapsule wall material is to improve the strength of the gelatine-chitosan wall material; meanwhile, the heat conducting performance of the gelatine-chitosan wall material can also be improved.

Description

technical field [0001] The invention belongs to the technical field of medical methods, and in particular relates to a preparation method of gelatin chitosan-nano silicon dioxide multi-core phase change energy storage microcapsules. Background technique [0002] Phase change microcapsule is a new type of energy-saving and environmentally friendly energy storage material with a core-shell structure that is coated with a phase change material by a polymer to form a micro (nano) nanometer. Phase change energy storage material technology has huge market potential and broad application prospects in terms of energy saving and environmental protection. [0003] The encapsulation technology not only avoids direct contact between phase change materials and the outside world, but also solves the problems of easy leakage and phase separation of phase change materials, and expands the application field of phase change energy storage technology. Phase change microcapsules have the advan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06B01J13/14
CPCB01J13/14C09K5/063
Inventor 侯雪艳杨虎城王项项
Owner YANAN UNIV
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