Urea resin paraffin microcapsule material with high thermal conductivity and high enthalpy value and preparation method

A technology of paraffin microcapsules and high thermal conductivity, which is applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of increased production cost, thermal performance impact, and reduction of microcapsule phase change enthalpy to achieve thermal conductivity Improve and evenly cover the effect

Active Publication Date: 2016-09-28
SICHUAN UNIV
View PDF10 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example: when the nano-metal particles are coated on the surface of the microcapsules, although the thermal conductivity is improved, the phase change enthalpy of the microcapsules is greatly reduced due to the high density of the metal particles; when the microcapsules are dispersed

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Add 5.00g of urea, 0.50g of ammonium chloride, 0.50g of resorcinol and 45.00g of paraffin into 200.00mL of deionized water, raise the temperature to 60°C, keep stirring for 10 minutes (200rpm), then add 12.67g of formaldehyde solution, stirring speed Increase to 10000rpm for 4 hours. The obtained microcapsules are filtered, washed and dried to obtain a powder with uniform particle size distribution. Add 0.50g of graphene oxide (mass ratio of graphene oxide to microcapsules: 1:20), 0.10g of cetyltrimethylammonium bromide (mass ratio of 5:1) and 50mL of deionized water, ultrasonic 30 minutes to obtain a graphene oxide dispersion. Add 10.00 g of the prepared microcapsule powder and 0.10 g of sodium dodecylbenzenesulfonate (mass ratio: 100:1) into 100 mL of deionized water, ultrasonicate for 10 minutes, then add the prepared graphene oxide dispersion, and keep stirring 30 minutes (100rpm), then filtered, washed and dried to obtain graphene oxide-coated urea-formaldehyde r...

Embodiment 2

[0018] Add 5.00g of urea, 0.50g of ammonium chloride, 0.50g of resorcinol and 45.00g of paraffin into 200.00mL of deionized water, raise the temperature to 60°C, keep stirring for 10 minutes (200rpm), then add 12.67g of formaldehyde solution, stirring speed Increase to 10000rpm for 4 hours. The obtained microcapsules are filtered, washed and dried to obtain a powder with uniform particle size distribution. Add 1.00g of graphene oxide (mass ratio of graphene oxide to microcapsules: 1:10), 0.10g of cetyltrimethylammonium bromide (mass ratio of 10:1) into 50mL of deionized water, ultrasonic for 30 minutes , to obtain a graphene oxide dispersion. Add 10.00 g of the prepared microcapsule powder and 0.10 g of sodium dodecylbenzenesulfonate (mass ratio: 100:1) into 100 mL of deionized water, ultrasonicate for 10 minutes, then add the prepared graphene oxide dispersion, and keep stirring 30 minutes (100rpm), then filtered, washed and dried to obtain graphene oxide-coated urea-formal...

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 relates to a urea resin paraffin microcapsule material with high thermal conductivity and high enthalpy value and a preparation method. The urea resin paraffin microcapsule material is covered by graphene oxide. Graphene oxide serves as a covering layer, thermal conductivity of microcapsules is improved, and the phase change enthalpy value of the microcapsules is not reduced. The material is of a double-layer core-shell structure, the outermost layer is graphene oxide, the inner layer is urea resin, and a core is paraffin. The preparation method includes the steps that firstly, urea resin paraffin microcapsules are prepared, and the obtained microcapsules are washed and dried; secondly, graphene oxide and positive ion surfactant are added into deionized water for ultrasonic dispersion, and graphene oxide dispersion liquid is obtained; thirdly, the microcapsules obtained in the first step and a negative ion surfactant are added into water for ultrasonic dispersion, the dispersion liquid obtained in the second step is added to be stirred, and a final product is obtained through filtering, washing and drying. The microcapsules prepared through the method are uniform in particle size distribution, and thermal performance of paraffin microcapsules can be effectively improved.

Description

technical field [0001] The invention relates to graphene oxide coating of urea-formaldehyde resin microcapsules, belonging to the field of new materials. Background technique [0002] Phase change energy storage is a new type of energy storage, which can alleviate the problem of uneven energy matching in time and space, and effectively improve energy utilization. Paraffin wax is a very widely used phase change material, which has the advantages of large latent heat of phase change, no supercooling phenomenon, stable chemical properties, non-toxic, and cheap. However, it needs to be shaped or microencapsulated to avoid leakage during solid-liquid phase transition. [0003] However, the main restriction to the application of phase change materials is their low thermal conductivity. Due to the low thermal conductivity of paraffin wax itself, after high polymer microencapsulation, the thermal conductivity is further reduced, resulting in low efficiency of the heat transfer proc...

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
IPC IPC(8): C09K5/06
Inventor 毛健乔榛
Owner SICHUAN 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