In order to solve the phase separation problem of Na₂S₂O₃·5H2O–CH3COONa·3H₂O PCM (phase change material), sodium carboxymethyl cellulose (CMC), hydroxyethyl cellulose (HEC), xanthan gum (XG), sodium polyacrylate (PAAS) and polyacrylamide (PAM) were selected as additives. The effects of different proportions of the above thickeners on the supercooling degree, phase separation, phase change temperature and latent heat of Na₂S₂O₃·5H2O–CH3COONa·3H₂O system were studied by using the cooling curve and DSC, so as to screen the best thickener for eutectic PCM. The experimental results show that CMC, XG and PAAS can eliminate the phase separation of Na₂S₂O₃·5H2O–CH3COONa·3H₂O. Among them, the optimal ratio of CMC, XG and PAAS is 3 mass%, 3 mass% and 1 mass%, respectively. From the perspective of heat storage performance, PAAS is the optimal thickener for Na₂S₂O₃·5H2O–CH3COONa·3H₂O. The phase change temperature is 40.5 °C. The subcooling degree is about 14.7 °C, and the latent heat is about 221 J g⁻¹. The melting time is 15 min. Only PAAS can make Na₂S₂O₃·5H2O–CH3COONa·3H₂O eutectic PCM completely exothermic at room temperature, which can not only play the role of thickener to eliminate phase separation, but also is a nucleating agent. After 100 melting-solidification cycles, the change rate of latent heat value was only 5%, and the change rate of phase transition temperature was less than 1%. Considering heat storage performance and cyclic stability, PAAS is the optimal thickener for Na₂S₂O₃·5H2O–CH3COONa·3H₂O PCM.

为了解决Na ₂ S ₂ O ₃ ·5H2O–CH3COONa·3H ₂ O PCM（相变材料）、羧甲基纤维素钠（CMC）、羟乙基纤维素（HEC）、黄原胶（XG）、钠选择聚丙烯酸酯（PAAS）和聚丙烯酰胺（PAM）作为添加剂。上述增稠剂不同配比对Na ₂ S ₂ O ₃ ·5H2O–CH3COONa·3H _{2过冷度、相分离、相变温度和潜热的影响}利用冷却曲线和DSC对O体系进行了研究，以筛选出最佳的共晶PCM增稠剂。实验结果表明，CMC、XG和PAAS可以消除Na ₂ S ₂ O ₃ ·5H2O–CH3COONa·3H ₂ O的相分离。其中，CMC、XG和PAAS的最佳配比为3质量%、3质量% 和 1 质量%，分别。从蓄热性能来看，PAAS是Na ₂ S ₂ O ₃ ·5H2O–CH3COONa·3H ₂ O的最佳增稠剂，相变温度为40.5 ℃。过冷度约为14.7℃，潜热约为221 J g ^-1。熔化时间为 15 分钟。只有 PAAS 可以制造 Na₂ S ₂ O ₃ ·5H2O–CH3COONa·3H ₂ O共晶PCM在室温下完全放热，既能起到增稠剂消除相分离的作用，又是成核剂。100次熔固循环后，潜热值变化率仅为5%，相变温度变化率小于1%。考虑到蓄热性能和循环稳定性，PAAS是Na ₂ S ₂ O ₃ ·5H2O–CH3COONa·3H ₂ O PCM的最佳增稠剂。