| Citation: |
OUYANG Qinwen, LIAO Haiyan, LI Xiaobin, et al. Lotus-effect biomimetic modification of the cotton fabric and its negative ion functionality[J]. Acta Materiae Compositae Sinica, 2025, 42(5): 2636-2646. DOI: 10.13801/j.cnki.fhclxb.20240809.003
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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 4wt% and the concentration of the TM was 4wt%, the modified fabric was imparted with the best comprehensive performance: Contact angle of 145.8°, water vapor transmission rate of
In order to obtain effective negative ion release property of cotton fabric, which exhibit self-cleaning function while purifying environment. On the basis of ensuring the softness, through the effective combination of fluorine-free hydrophobic modification and rough structure constructed by tourmaline, the fabrics with self-cleaning and negative ion function were developed, which has a broad application prospect in the field of automobile interior.
Inspired by the surface structure of lotus leaf, the cotton fabric was modified with biomimetic structure with changing from hydrophilic to hydrophobic by amino-modified polysiloxane (AMP), while a layer of adhesive structure was formed on the surface. The tourmaline particles (TM) were introduced to construct the micron rough structure to further enhance its hydrophobicity, exhibiting a certain amount of anion release properties. The effects of different concentrations of AMP and TM on the fabric morphology and surface chemical composition were studied by Scanning electron microscope and Infrared spectroscopy. The contact angle, air permeability, moisture permeability, mechanical property and anion release performance of the fabrics before and after finishing were also tested and analyzed. Finally, the surface morphology and contact angle of the modified cotton fabric after dry and wet friction were tested, and the changes of contact angle and anion release property after 20 times of grinding were measured, in order to analysis the durability of the composite coating cotton fabric modified by 4wt% AMP + 4wt% TM.
The fluorine-free hydrophobic modification by AMP on the cotton fabric changed its surface wettability from hydrophilic (45.4°) to hydrophobic. With the increase of AMP concentrations, the contact angle gradually increased. When AMP concentration was 4 wt%, the contact angle reached 143.8°. The flexural stiffness test results showed that hydrophobic finishing does not affect the softness. Therefore, the cotton fabric after 4 wt% AMP modification was finished by TM, and the hydrophobic-negative ion composite coated fabric was obtained. The biomimetic microstructures from natural lotus leaves on the surface by the introduction of TM particles further improved the hydrophobicity. With the increase of TM concentrations, the moisture and air permeability of the modified fabric increased firstly and then decreased, and the negative ion release performance of the fabric was greatly improved. 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 of 5428 g/(m·24h)，air permeability of 434.2 mm/s, maximum force of 175.6 N，and negative ion release of 1640 ions/cm. 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 to 2108 ions/cm after 20 times of surface grinding.Conclusions: The cotton fabrics were modified with environment-friendly fluorine-free hydrophobic agent to achieve low surface energy modification with ensuring softness, forming a layer of adhesive structure on the surface. Then TM particles were introduced to construct the rough structure of the fabric, which realized the bionic structure from natural lotus leaves surface, it also imparted the fabric relative good anion releasing property and durability, indicating the materials have a broad application prospect in the field of automobile interior decoration.
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