A kind of urea-formaldehyde resin paraffin microcapsule material with high thermal conductivity and high enthalpy value and its preparation method

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...

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 to a high thermal conductivity In the structure of high efficiency, its production cost is also greatly increased, and the thermal performance is also greatly affected

Therefore, there are certain limitations in improving the thermal performance of microcapsules by the above two methods.