将石蜡真空浸渍于膨胀蛭石中,以其共同作为内相,丙烯酰胺水溶液作为外相,制得水包油乳液,引发剂使外相聚合,得到形状稳定的复合相变储热颗粒。测试结果表明：乳化剂和膨胀蛭石分别为石蜡质量的6%和2%时,熔融焓数值为128.79 J/g,石蜡的包覆率为72.80%;复合颗粒的形状是表面规整的球体,颗粒大小均匀;经过100次循环后,熔融焓只降低2.18%;复合颗粒在470 ℃以下有较好的热稳定性。膨胀蛭石与聚丙烯酰胺对石蜡的二次封装可有效提高复合体系防泄露能力,具有可靠的储能和温度调节性能。
Abstract
In this paper, paraffin was vacuum-impregnated in expanded vermiculite as the inner phase, and acrylamide aqueous solution was used as the outer phase to prepare an oil-in-water emulsion. The initiator polymerized the outer phase to obtain shape-stable composite phase-change heat storage particles. The test results show that when the emulsifier is 6% of the paraffin mass and the expanded vermiculite is 2% of the paraffin mass, the melting enthalpy value is 128.79 J/g, and the paraffin coating rate is 72.80%. The shape of the composite particles is regular in the surface. The particles are spherical and uniform in size. After 100 cycles, the melting enthalpy only decreases by 2.18%. The composite particles have good thermal stability below 470 ℃. The secondary encapsulation of paraffin by expanded vermiculite and polyacrylamide effectively improves the anti-leakage capability of the composite system, and has reliable energy storage and temperature regulation performance.
关键词
乳液聚合 /
相变储热 /
有机无机复合 /
太阳能存储
Key words
emulsion polymerization /
phase change heat storage /
organic-inorganic compounding /
solar storage
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基金
国家自然基金（21865027）; 有机无机复合材料国家重点实验室开放课题（oic-202001011）; 塔里木大学创新群体项目（TDZKCQ201901）; 新疆建设兵团中青年科技创新领军人才项目（2020CB019）
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