十二水磷酸氢二钠纳米复合相变材料的过冷特性  

Supercooling characteristics of disodium hydrogen phosphate nano-composites phase change materials

作　　者：陈跃 纪珺 徐笑锋 章学来[1] 李玉洋 陈启杨 刘升[2] CHEN Yue;JI Jun;XU Xiaofeng;ZHANG Xuelai;LI Yuyang;CHEN Qiyang;LIU Sheng(Institute of Cool Storage Technology,Shanghai Maritime University,Shanghai 201306,China;Beijing Vegetable Research Center Beijing Academy of Agriculture and Forestry Sciences,Beijing 100097,China)

机构地区：[1]上海海事大学蓄冷技术研究所,上海201306 [2]北京市农林科学院蔬菜研究中心,北京100097

出　　处：《化工进展》2018年第7期2734-2739,共6页Chemical Industry and Engineering Progress

基　　金：上海市科委项目(16040501600)

摘　　要：研制了一种以十二水磷酸氢二钠(Na2HPO4·12H2O)为主储能材料的中低温相变材料。通过添加成核剂纳米Al2O3、纳米Ti O2、纳米石墨粉、多壁碳纳米管和高分子分散剂聚丙烯酸钠(PAAS)对Na2HPO4·12H2O改性。结果表明,多壁碳纳米管减少过冷度的同时会破坏Na2HPO4·12H2O的相变特性,添加3%(质量分数)的纳米Al2O3可以减少40.7%的过冷度,添加4%的纳米Ti O2可以减少44.6%的过冷度,添加4%的纳米石墨粉可以减少62.3%的过冷度。对于添加3%纳米Al2O3的复合相变材料,PAAS浓度对过冷度无影响;对于4%纳米Ti O2的复合相变材料,添加4%PAAS过冷度最低为3.2℃,减少了76.1%;对于4%纳米石墨粉的复合相变材料,2%PAAS过冷度最低为1.2℃,减少了90.7%;纳米石墨粉/PAAS/Na2HPO4·12H2O三元复合相变材料经过100次循环实验后,发现具有较好的热稳定性。A low temperature phase change material with the disodium hydrogen phosphate（Na2 HPO4·12 H2 O） as the main energy storage material was developed. The property of the Na2 HPO4·12 H2 O was modified by adding nucleators, such as nano Al2 O3, nano Ti O2, nano-graphite powder, multi-walled carbon nanotubes（MWCNTs）, and the polymer dispersant polyacrylic acid sodium（PAAS）. The results showed that the adding of MWCNTs would reduce the super-cooling degree of the Na2 HPO4·12 H2 O while destroy its phase change characteristics. The super-cooling degree decreased by 40.7% after adding 3%（mass fraction） nano Al2 O3,44.6% by adding 4% nano Ti O2,and decreased by 62.3% after adding 4% nano-graphite powder. Compared with 3%（mass fraction） nano Al2 O3 composite phase change material,the concentration of PAAS had no effect on the supercooling degree. Comepared with 4% nano Ti O2 composite phase change material,the minimum supercooling degree was 3.2℃,which decreased by 76.1% by adding 4% PAAS. Comepared with 4% nano-graphite powder composite phase change material,the minimum supercooling degree was 1.2℃,which decreased by 90.7% by adding 2% PAAS. It was found that the three elements composite phase change material had good thermal reliability by the cyclic experiments.

关 键 词：复合材料 相变 纳米粒子 过冷 稳定性 

分 类 号：TK02[动力工程及工程热物理]