相变储湿纤维/石膏复合材料的制备及综合性能

Preparation and comprehensive performance of phase change and humidity storage fibers/gypsum composite

以抹灰石膏作为基体材料,将相变储湿纤维掺入抹灰石膏中,制备相变储湿纤维/石膏复合材料,对其基本性能、储湿调湿性能、相变调温性能和耐久性能进行测试与分析。利用FTIR和SEM研究相变储湿纤维/石膏复合材料的结构组成和微观形貌。结果表明:当相变储湿纤维掺量为40.0wt%时,相变储湿纤维/石膏复合材料具有最佳性能和良好耐久性能,其标准扩散度用水量为0.70、初凝时间为40min、终凝时间为55min、体积密度为1 005.56kg·m-3、拉伸连接强度为0.10 MPa、抗压强度为2.55 MPa;在相对湿度40%~65%时的平衡含湿量为0.0395~0.0935g·g-1;从35℃至20℃的降温时间为100s,相变平台明显;经过循环试验,相变储湿纤维/石膏复合材料的吸放湿性能下降小于10%,相变调温性能下降小于5%。

With plastering gypsum as the matrix,phase change and humidity storage fibers were mixed with plastering gypsum to prepare phase change and humidity storage fibers/gypsum composite.Basic performance,humidity storage humidity controlling performance,phase change temperature controlling performance and durability performance of phase change and humidity storage fibers/gypsum composite were tested and analyzed.Structural composition and microstructure of phase change and humidity storage fibers/gypsum composite were analyzed by FTIR and SEM.The results show that phase change and humidity storage fibers with mass content of 40.0 wt% can provide the best performance and good durability performance of phase change and humidity storage fibers/gypsum composite.The standard diffusion degree of water consumption is 0.70,initial setting time is 40 min,final setting time is 55 min,bulk density is 1 005.56 kg/m^3,tensile connection strength is 0.10 MPa and compressive strength is 2.55 MPa.Equilibrium moisture content is 0.0395-0.0935 g·g-1 in relative humidity 40%-65%.Cooling time is 100 sform 35℃to 20℃ with clear phase change platform.After the cycling test,the moisture absorption performance decline of phase change and humidity storage fibers/gypsum composite is less than 10%,phase change and temperature controlling performance decline is less than 5%.