Lotus-effect biomimetic modification of the cotton fabric and its negative ion functionality
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摘要: 为使棉织物获得良好的负离子释放效果,并且满足棉织物应用于汽车内饰时功能化的需求,在净化环境的同时能够具备自清洁功能。本文采用氨基改性聚硅氧烷(AMP)进行无氟疏水整理使棉织物由亲水变为疏水,同时在棉织物表面形成一层粘连结构,引入电气石(TM)颗粒仿生构筑了荷叶表面的微突结构。当AMP的浓度为4 wt%、TM浓度为4 wt%,改性织物综合性能最佳:接触角达到145.8°,透湿量为
5428 g/(m2·24h),透气量为434.2 mm/s,断裂强力为175.6 N,负离子释放量为1640 个/cm3。继续增加TM浓度到8 wt%时,接触角达到150.3°,织物表面呈现超疏水特性。此外,4 wt% AMP+4 wt% TM改性棉织物的耐久性测试表明,经过干摩擦50次后仍然具有较高的接触角(142.4°),平磨20次后负离子释放量有所提升,为2108 个/cm3。本文通过对棉织物进行疏水-负离子复合涂层整理,使其具有一定的自清洁性能且负离子释放量达到了较高水平,使得该材料在汽车内饰领域具有广阔的应用前景。Abstract: In pursuit of achieving the effective negative ion release property for cotton fabric, and to meet the functional requirements of cotton fabric when applied to automotive interiors, which entails environmental purification as well as self-cleaning capabilities. The amino-modified polysiloxane (AMP) was employed for fluorine-free hydrophobic finishing to endow the cotton fabric with hydrophobicity in this study, while forming adhesive structure on the surface of the cotton fabric. The introduction of tourmaline particles (TM) constructed the biomimetic micro-papillary structure like the surface of the lotus leaf. When the concentration of the AMP was 4 wt% and the concentration of the TM was 4 wt%, the modified fabric was imparted with the best comprehensive performance: contact angle of 145.8°, water vapor transmission rate of5428 g/(m2·24h), air permeability of 434.2 mm/s, maximum force of 175.6 N, and negative ion released of1640 ions/cm³. Further increasing the concentration of TM to 8 wt%, the fabric was imparted with certain self-cleaning properties (contact angle of 150.3°). In addition, the durability test of cotton fabric modified by 4wt% AMP + 4wt% TM showed that it still had a high contact angle (142.4 °) after 50 times of dry friction, and the release of negative ions increased to2108 ions/cm3 after 20 times of surface grinding. Through the application of a hydrophobic-negative ion composite coating to the cotton fabric, this research successfully fabricated a modified cotton fabric with superhydrophobicity and negative ion emission capabilities, thus offering broad application prospects of the modified cotton fabric in the automotive interior sector. -
图 1 经过4 wt% 氨基改性聚硅氧烷(AMP)疏水改性前后棉织物的SEM图对比:(a)棉织物(x500)、(b)棉织物(x2000)、(c)经疏水整理后的棉织物(x500)、(d)经疏水整理后的棉织物(x2000)
Figure 1. Comparison of SEM images of cotton fabric before and after 4 wt% amino-modified polysiloxane (AMP) hydrophobic modification: (a) cotton fabric (x500), (b) cotton fabric (x2000), (c) cotton fabric after hydrophobic treatment (x500), (d) cotton fabric after hydrophobic treatment (x2000)
图 7 整理前后棉织物的负离子释放量:(a)棉织物、(b)4 wt% AMP、(c)4 wt% AMP+1 wt% TM、(d)4 wt% AMP+2 wt% TM、(e)4 wt% AMP+4 wt% TM、(f)4 wt% AMP+6 wt% TM、(g)4 wt% AMP+8 wt% TM
Figure 7. Negative ion released of pure cotton fabric before and after finishing: (a) Pure cotton fabric, (b) 4 wt% AMP, (c) 4 wt% AMP+1 wt% TM, (d) 4 wt% AMP+2 wt% TM, (e) 4 wt% AMP+4 wt% TM, (f) 4 wt% AMP+6 wt% TM, (g) 4 wt% AMP+8 wt% TM
图 8 不同摩擦次数后4 wt% AMP+4 wt% TM样品的电镜和接触角:(a)干摩10次、(b)干摩20次、(c)干摩30次、(d)干摩50次、(e)湿摩10次、(f)湿摩20次、(g)湿摩30次、(h)湿摩50次
Figure 8. Electron microscopy and contact Angle of 4 wt% AMP+4 wt% TM sample after different friction times: (a) dry rubbing 10 times, (b) dry grinding 20 times, (c) dry grinding 30 times, (d) dry grinding 50 times, (e) wet grinding 10 times, (f) wet grinding 20 times, (g) wet grinding 30 times, (h) wet grinding 50 times
表 1 平磨20次后样品的接触角、负离子释放量
Table 1. Contact Angle and negative ion released of the sample after 20 times of flat grinding
Sample WCA/(°) Negative ion rleased/
(ions·cm−3)4 wt% AMP+4 wt% TM 132.3 ± 4.1 2108 ± 118Notes: The samples in the table are cotton fabrics finished by the 4 wt% AMP+4 wt% TM composite coating. After plain grinding for 20 times, different tests were carried out. Where WCA is the water contact angle of the samples; Negative ion released is the number of negative ions excited by the sample per unit volume space. -
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