| Superhydrophobic phenomenon is a kind of physical phenomenon that the contact angle of water drop is more than 150°when it contacts the solid surface horizontally.Superhydrophobic fabric has outstanding functionality,so it has a broad application prospect in life and production.The superhydrophobic property of fabric surface depends on two aspects:the surface roughness of fabric fiber and the free energy of fabric fiber surface.However,in daily use,mechanical washing,friction and chemical corrosion will destroy the micro-nano composite structure on the surface of superhydrophobic fabric,resulting in the loss of superhydrophobic property on the surface of the fabric,which limits its practical application.Therefore,how to prepare textiles with high durability and service life by simple and environmentally friendly technology is a research hotspot in this field.In this paper,the superhydrophobic surface with multi-level roughness structure has been constructed on the cross-section polyester with a certain surface roughness by using self-made nano titanium dioxide sol and dodecyltrimethoxysilane(DTMs)as raw materials.First,a stable nano titanium dioxide sol was prepared by the sol-gel method,and then DTMS was added to prepare a modified nano titanium dioxide sol.DTMS will hydrolyze Si-OH under acidic conditions,through its self-crosslinking reaction,and it also crosslinks with Ti-OH in nano-titanium dioxide sol to form stable Si-O-Si bonds and Si-O-Ti bonds.At the same time,the cross-section polyester fabric was treated by low temperature oxygen plasma.The etching effect was formed on the surface of the fiber,and a large number of oxygen-containing groups were produced,which activated the surface of the fiber.Then,the fabric is immersed in the modified titanium dioxide sol,which is cured at high temperature after two soaking and two rolling.SEM,X-ray energy spectrum(EDS),infrared spectrum(FT-IR),thermogravimetry(TG)and X-ray electron spectroscopy(XPS)were used to characterize the fabric that before and after modification.The results showed that the modified nano titanium dioxide(DTMS-TiO2)had formed a close combination with the fabric fiber,formed a dense cross-linking network on the fiber surface,and then fabricate therobust and durable hydrophobic fabric.The contact angle of the modified super hydrophobic polyester fabric reached 159°.Measure the change of contact angle after 2000 times of abrasion cycles(according to GB/T 3920-2008 standard),or 50 times of laundering cycles(according to AATCC-61-2006 standard),or after immersed in a solution of different pH value,organic solvent,strong acid solution,strong alkali solution,salt solution for 48h,or after exposure to UV light for 48h,the WCA on the surface of the modified fabric is still greater than 150°.In addition,in order to further explore the self-healing property of the modified fabric,the fabric samples that the contact angle reduced to 141° after 5000 times abrasion were treated witha short-time heat,and then the surface contact angle was recovered to more than 150° after measurement.Similarly,the modified fabric is treated with low-temperature plasma to destroy its surface structure,and the fabric loses its hydrophobicity and becomes a hydrophilic fabric.However,after a short heat treatment or left at room temperature for 12 hours,the fabric can also spontaneously recover its surface’s superhydrophobicity.This damage-self-healing process can be repeated at least 10 times.After 10 times,the fabric contact angle is still greater than 150°.The results show that the modified super hydrophobic polyester fabric not only has the properties of stable and durable mechanical friction resistance,washing resistance,organic solvent resistance,but also has good hydrophobic self repair performance. |
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