首页|Na2CO3·10H2O-Na2HPO4·12H2O/SiO2复合定形相变材料的制备及应用

Na2CO3·10H2O-Na2HPO4·12H2O/SiO2复合定形相变材料的制备及应用

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以 Na2CO3·10H2O(SCD)、Na2HPO4·12H2O(DHPD)为相变主体制备了共晶体系,通过绘制凝固点变化图与DSC测试共同确定在m(SCD)∶m(DHPD)=4∶6 时形成共晶,FTIR和XRD结果显示,2 种水合盐间没有发生化学反应,但其晶型结构发生改变.通过添加质量分数为 2%的Na2SiO3·9H2O作为成核剂降低体系的过冷度,且经历 50 次相变循环体系未出现相分离,相变焓值仅下降 0.25%.进一步使用质量分数为 25%的气相SiO2 作为支撑材料,采用浸渍法制备了相变前后形状稳定的共晶水合盐/SiO2 定形相变材料(SSPCM).所得SSPCM的相变温度为24.08℃,相变焓值为146.6 J/g,过冷度为0.55℃,热导率为0.4571 W/(m·K).同保温泡沫相比,其可将模拟房内部中心温度的升温时间延长了1.81倍,降温时间延长了0.39倍.
Preparation and application of Na2CO3·10H2O-Na2HPO4·12H2O/SiO2 composite shape-stabilized phase change materials
The eutectic system was prepared from Na2CO3·10H2O(SCD)and Na2HPO4·12H2O(DHPD)phase change materials,and it was found that the eutectic system was formed when m(SCD)∶m(DHPD)= 4∶6 by a solidification point variation diagram construction and DSC test.FTIR and XRD results revealed that the crystal structure was changed though there was no chemical reaction between the two hydrated salts.Na2SiO3·9H2O with a mass fraction of 2%was added as nucleating agent to reduce the undercooling of the system.Meanwhile,the system showed no phase separation and only a 0.25%decrement in enthalpy after undergoing 50 cycles of phase transition.Furthermore,a shape-stablized phase change material(SSPCM)consisting of eutectic hydrate/SiO2 with a mass fraction of 25%was prepared by impregnation.The obtained SSPCM exhibited a phase transition temperature of 24.08℃,an enthalpy of 146.6 J/g,an undercooling of 0.55℃,and a thermal conductivity of 0.4571 W/(m⋅K).Compared with conventional insulation foam,the SSPCM extended the heating time to raise the simulated indoor core temperature by 1.81 times and prolonged the cooling time by 0.39 times.

Na2CO3·10H2ONa2HPO4·12H2Oeutectic hydrate saltscomposite phase change materialsbuilding energy conservationfunctional materials

王璇、李再超、吴亚楠、唐炳涛、张宇昂

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大连理工大学 精细化工国家重点实验室,辽宁 大连 116024

Na2CO3·10H2O Na2HPO4·12H2O 共晶水合盐 复合相变材料 建筑节能 功能材料

国家重点研发计划项目国家自然科学基金项目国家自然科学基金项目

2022YFB38065002210802622108050

2024

10.13550/j.jxhg.20230383

精细化工
大连化工研究院设计院 中国化工学会精细化工专业委员会 辽宁省化工研究院

精细化工

CSTPCD北大核心
影响因子：0.557
ISSN：1003-5214
年,卷(期)：2024.41(3)
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