摘要
为克服Na2S2O3·183;5H2O存在的过冷和相分离现象，以CaSO4·183;2H2O、萘酚等为成核剂，并以羧甲基纤维素（CMC）、活性白土和水溶性石蜡为增稠剂对Na2S2O3·183;5H2O进行改性，通过步冷曲线和DSC分析对改性后的Na2 S2 O3·183;5 H2 O蓄/放热性能进行研究。结果表明：CaSO4·183;2H2O、萘酚以及萘酚-NaCl对Na2S2O3·183;5H2O均有明显改性效果；对于Na2S2O3·183;5H2O-CaSO4·183;2H2O体系，增稠剂用量相同时，水溶性石蜡及活性白土的增稠效果优于CMC；经CaSO4·183;2H2O和活性白土体系改性后的Na2S2O3·183;5H2O最高放热温度在43～48℃之间变化，放热时间最长可达80 min以上，且均可在27℃以上完成结晶过程并释放热量；经萘酚-NaCl体系改性后的Na2 S2 O3·183;5 H2 O具有良好的稳定性，经过不同次数吸热/放热循环后的相变温度在41～46℃之间变化，放热时间均可维持在70 min以上；改性后的Na2S2O3·183;5H2O相变焓在150～180 J/g之间，其蓄/放热过程无相分离现象。
In order to overcome its supercooling and phase separation,Na2 S2 O3 ＆#183;5 H2 O,a kind of phase-change material,was modified,with CaSO4＆#183;2H2O,naphthol as the nucleating agents,and with carboxymethyl cellulose （CMC）,activated clay and solvable paraffin as the thickening agents.Then,the thermal storage/release perfor-mance of the modified Na2 S2 O3 ＆#183;5 H2 O was investigated by using the cooling curve and the DSC analysis.The re-sults indicate that （1 ）CaSO4 ＆#183;2H2 O,naphthol and naphthol-NaCl all play important role in the modification of Na2S2O3＆#183;5H2O;（2）as compared with CMC,solvable paraffin and activated clay are of higher thickening effi-ciency for Na2S2O3＆#183;5H2O-CaSO4＆#183;2H2O with the same dosage of thickening agent;（3）Na2S2O3＆#183;5H2O modi-fied with CaSO4＆#183;2H2O and activated clay achieves the crystallization and releases thermal energy at above 27℃, with the highest exothermic temperature varying from 43 to 48℃ and with an exothermic duration being more than 80 min;（4）Na2 S2 O3 ＆#183;5 H2 O modified with naphthol-NaCl possesses good stability and is of a phase-change tem-perature varying from 41 to 46℃ at different times of heat storing-releasing circulation,and the heat release even lasts for more than 70 min;and （5）the phase change enthalpy of modified Na2S2O3＆#183;5H2O varies from 150 to 180 J/g,while no phase separation occurs in the thermal storage/release process.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2014年第2期8-13,20,共7页
Journal of South China University of Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(20976056
21276089)
关键词
相变蓄热材料
五水硫代硫酸钠
改性
萘酚
二水硫酸钙
成核剂
增稠剂
phase-change thermal-storage material
sodium thiosulfate pentahydrate
modification
naphthol
cal-cium sulfate dihydrate
nucleating agent
thickening agent
