负压微波处理钛酸钡负载羊毛纤维

Negative Pressure Microwave Treatment of Wool Fiber Loaded with Barium Titanate

为实现微波对羊毛鳞片尖端的精准作用,根据微波辐射的选择性加热规律,选择介电损耗因数远高于羊毛纤维的纳米钛酸钡颗粒,利用超声波震荡将其负载在羊毛鳞片尖端翘角内,以吸收大部分微波辐射能.结果表明:40kHz超声波在40℃预处理40min时对羊毛纤维的损伤最小,由于超声波震荡作用,羊毛纤维表面缝隙内负载纳米钛酸钡颗粒,再经微波处理后的羊毛纤维鳞片尖端钝化,定向静摩擦效应降低了38.8%,定向动摩擦效应降低了61.8%,断裂强度与断裂伸长率与未处理羊毛基本相同,有效降低了微波对羊毛纤维力学性能的负面影响.此外,扫描电镜和红外光谱显示,40kHz超声波在40℃清洗40min,可将纳米钛酸钡颗粒完全清除,不影响纤维后续加工和应用.

In order to achieve the precise effect of microwave on the tips of wool scales,according to the selective heating rule of microwave radiation,nano barium titanate particles whose dielectric dissipation factor was much higher than that of wool fiber were selected and loaded into the protruding tips of wool scales by means of ultrasonic vibration,to absorb most of the microwave radiation energy.The results show that the damage to wool fiber is the lowest when it is pretreated by 40 kHz ultrasonic wave at 40℃for 40 min.Due to the effect of ultrasonic vibration,nano barium titanate particles are loaded in the gap on the surface of wool fiber.After microwave treatment,the tips of wool fiber scales are passivated.The directional static friction effect is reduced by 38.8%,and the directional dynamic friction effect is reduced by 61.8%.The breaking strength and elongation at break of the sample is similar to those of the untreated wool.The negative effect of microwave on the mechanical properties of wool fibers is effectively reduced.In addition,scanning electron microscopy and infrared spectroscopy show that the nano barium titanate particles can be completely eliminated by cleaning with 40 kHz ultrasonic wave at 40℃for 40 min,without affecting the subsequent processing and application of wool fibers.