凹凸棒土吸附相变储能复合材料制备及其热物理性能表征

Study on preparation and thermal performance tests of attapulgite-based phase change composites for energy storage

基于凹凸棒土对有机物的良好吸附性能,以凹凸棒土为吸附介质、石蜡为吸附对象,制备有机/无机复合相变材料。由于有机相变材料被吸附到微孔中,使其相变在固定的空间内进行,从而避免了材料在液相状态下的流动和渗漏问题。试验结果显示,坡缕石占80%的凹凸棒土吸附石蜡的最优质量比为2∶1。DSC的测试显示,复合相变材料的焓变值与凹凸棒土和石蜡的吸附比例相关,凹凸棒土中坡缕石的含量越高,凹凸棒土的吸附能力就越强,复合相变材料的焓变值也就越大。温度循环试验的结果显示,复合相变材料具有良好的储(放)热性能,在环境温度上升和下降的过程中,能够储存和释放热量,这不仅增加了环境温度的惰性,也使能量能够在不同的时间和空间进行迁移,从而达到一定的节能效果。

The attapulgite clay with pore-network structures has favorable adsorption performance toward organic materials.According to its adsorption properties,the attapulgite clay was compounded with paraffin wax to produce phase change composites for energy storage（PCCES）.As the paraffin was adsorbed into the pores and changed phase in a fixed space,the problems like leakage or flowage were avoided.The experimental results show that the optimal adsorption effect emerges when the mass ratio of attapulgite containing 80% palygorskite to paraffin wax is 2∶1.The DSC tests indicated that the quantity of composites latent heat is related with the proportion of attapulgite and paraffin.The quantity of palygorskite in the composites is the main factor to affect the ability of adsorption.It can be learned from the temperature circle tests that the PCCES can absorb certain amount of heat when the environmental temperature rises,and release it during the cooling process.These properties may be developed and find applications in the energy saving field.