相变调温纤维的制备及其调温性能

Preparation of Phase Change Temperature Regulating Fiber and Its Temperature Regulating Performance

选取本课题组自制的相变母粒为芯材,以纤维级聚丙烯为皮材,采用皮芯复合熔体纺丝法制备相变调温纤维。测试分析纤维结构与性能,并探究不同测试条件与方法对纤维品质指标测试的影响。结果显示,纤维截面为皮芯形貌结构,相对强度为1.8 cN/dtex,断裂伸长率为24.6%,其芯材在231.45℃开始分解,常温下性能稳定;在加热冷却过程中有循环可逆的相变过程,其熔融温度范围为22~32℃,熔融热焓为21.72 J/g,结晶温度范围为10~20℃,结晶热焓为21.78 J/g。不同预热处理方法和升(降)温速率直接影响纤维相变特征指标测试结果,采用高温预热处理方法测得的相变焓值较大;在升(降)温速率为10 K/min及以下时测得的相变特征指标差异较小,而在20 K/min时测得的相变特征指标与其它速率下测得的指标相比差异较大。本研究结果对相变调温纤维制备工艺的制定及品质指标的测试方法制定具有实践指导意义。

The phase change masterbatch made by our research group was selected as the core material, and the fiber grade polypropylene was used as the skin material, the phase change temperature regulating fiber was prepared by the composite melt spinning method. The fiber structure and properties were tested and analyzed, and the influence of different test conditions and methods on fiber quality index test was explored.The results show that the fiber section is a skin core structure, the relative strength is 1.8 cN/dtex, and the elongation at break is 24.6%. The core material starts to decompose at 231.45 ℃, and its performance is stable at room temperature. The melting temperature range is 22~32 ℃, the enthalpy of melting is 21.72 J/g,the crystallization temperature range is 10~20 ℃, the enthalpy of crystallization is 21.78 J/g. Different preheating methods and rising(falling) temperature rates directly affect the test results of fiber phase change characteristics, and the enthalpy value of phase change measured by high temperature preheating treatment is larger. The characteristic indices of phase transition measured at rising(falling) temperature rate of 10 K/min and below have little difference, while the characteristic indices of phase change measured at 20 K/min have great difference compared with those measured at other rates. The results of this study are of practical significance to the preparation process and the testing method of quality index.