Na_2HPO_4·12H_2O与聚丙烯酸钠复合相变材料的制备及性能
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摘要
采用海藻酸钠作为增稠剂,选择硅酸钠、焦磷酸钠、硼砂为成核剂,以改善Na_2HPO_4·12H_2O储热性能。发现在5%质量分数的硅酸钠,5%质量分数的海藻酸钠作用下,相变体系的放热性能较优。并由丙烯酸钠单体经原位自由基聚合制备得到凝胶化的Na_2HPO_4·12H_2O/聚丙烯酸钠复合相变材料,实验表明该复合材料储热稳定性明显提高。
Sodium alginate was used as thickener and sodium silicate. In this paper, sodium silicate, sodium pyrophosphate, and borax were elected as nucleating agents to improve the heat storage performance of Na_2HPO_4·12H_2O. It is found that the exothermic performance of the phase transition system is better under the action of 5% mass fraction of sodium silicate and 5% mass fraction of sodium alginate. The gelated Na_2HPO_4·12H_2O/sodium polyacrylate composite phase change material was prepared by in situ free radical polymerization of sodium acrylate monomer. The experimental results show that the thermal storage stability of the composite is improved obviously.
Sodium alginate was used as thickener and sodium silicate. In this paper, sodium silicate, sodium pyrophosphate, and borax were elected as nucleating agents to improve the heat storage performance of Na_2HPO_4·12H_2O. It is found that the exothermic performance of the phase transition system is better under the action of 5% mass fraction of sodium silicate and 5% mass fraction of sodium alginate. The gelated Na_2HPO_4·12H_2O/sodium polyacrylate composite phase change material was prepared by in situ free radical polymerization of sodium acrylate monomer. The experimental results show that the thermal storage stability of the composite is improved obviously.
引文
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[2]沈澄,徐玲玲,李文浩.相变储能材料在建筑节能领域的研究进展[J].材料导报,2015,29(05):100-104.
[3]马烽,王晓燕,李飞,等.定形相变储能建筑材料的制备与热性能研究[J].材料工程,2010(06):54-58.
[4]Lan X Z,Tan Z C,Shi Q,et al.A novel gelling method for stabilization of phase change material Na2HPO4·12H2O with sodium alginate grafted sodium acrylate[J].Thermochimica Acta,2007,463(1):18-20.
[5]Lan X Z,Tan Z C,Shi Q,et al.Gelled Na2HPO4·12H2O with amylose-g-sodium acrylate:heat storage performance,heat capacity and heat of fusion[J].Journal of Thermal Analysis and Calorimetry,2009,96(3):1035-1040.
[6]兰孝征.凝胶化、微胶囊化低温相变储能材料研究[D].中国科学院研究生院(大连化学物理研究所),2003.
[7]王月祥,王执乾.有机相变储能材料及其复合技术研究进展[J].材料导报,2014,28(S2):213-215+228.