Super hydrophobic membrane and preparation method thereof
A superhydrophobic, ammonia water technology, applied in antifouling/underwater coatings, biocide-containing paints, coatings, etc., can solve the problem of lack of superhydrophobic surface preparation technology, and achieve high mechanical stability superhydrophobic surface, process Simple, low cost effect
Pending Publication Date: 2018-09-07
SUZHOU UNIV
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Problems solved by technology
[0005] Existing technologies generally include etching methods, template methods, vapor deposition methods, electrospinning methods, and layer-by-layer self-assembly methods to prepare superhydrophobic surfaces; however, there are many problems. Superhydrophobic surface preparation technology, from this perspective, sol-gel method, superhydrophobic coating, electrochemical synthesis, etc. are more suitable for large-scale industrial applications; for surfaces with self-cleaning functions, the durability of surface superhydrophobic properties Sex, mechanical strength, etc. are still facing great challenges
Method used
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Embodiment 1
[0030] First prepare a mixed solution of 5ml TEOS and 40ml ethanol, stir it magnetically at room temperature, add 1ml ammonia water (25wt%) dropwise to the mixed solution under stirring for the first time, stir for 30min; add dropwise 1ml ammonia water (25wt%) for the second time, stir for 30min ; Add 0.9ml of ammonia water (25wt%) dropwise for the third time, and stir for 255min; finally, leave it to age for 12h to obtain silica sol; the stirring is magnetic stirring, and the speed of magnetic stirring is 500rpm;
[0031] Cut a 2.5x2.5cm piece of glass and soak it in NaOH solution (0.5wt%) for 30 minutes, wash it with glass water and deionized water in turn, and dry it with nitrogen for later use;
[0032] Mix SiO in a certain proportion 2 Sol, fluorosilane and cross-linking agent, ultrasonic 1h to prepare modified sol; the fluorosilane and cross-linking agent are diluted 100 times with ethanol; the power of ultrasonic treatment is 80 kHz, and the time is 1 h;
[0033] Add t...
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The invention discloses a super hydrophobic membrane and a preparation method thereof. The preparation method comprises the following steps: dropwise adding ammonia water into an ethyl orthosilicate solution; standing and aging after stirring, so as to obtain silica sol; then mixing the silica sol with fluoroalkyl silane and a cross-linking agent to obtain modified sol; finally, laying the modified sol and heating to prepare the super hydrophobic membrane. The preparation method has the advantages of simple and convenient preparation process, relatively-low cost, suitability for large-scale industrial production and the like. A super-hydrophobic surface is prepared by spinning the modified SiO2 sol with the added crosslinking agent, so that the durability and mechanical strength of a super-hydrophobic coating are greatly improved.
Description
technical field [0001] The invention belongs to high-performance material technology, and in particular relates to a super-hydrophobic membrane and a preparation method thereof. Background technique [0002] Since ancient times, Zhou Dunyi has described lotus (leaves) as "out of mud but not stained". After modern times, people's interest in lotus leaves has become more profound, and its self-cleaning effect has been studied by more and more people, and it is called "Lotus Effect". In 1997, the German biologist Barthlott found through the study of a large number of plant leaf surface structures that this self-cleaning effect is determined by the low surface energy waxy substances on the leaf surface and the rough structure of the leaf surface. Studies have found that there are also nanostructures on the papillae of the microstructure on the surface of the lotus leaf. This micro-nano composite hierarchical structure and low surface energy substances are the root causes of the...
Claims
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Login to View More IPC IPC(8): C09D1/00C09D5/16
CPCC09D1/00C09D5/1618C09D5/1656
Inventor 王艳艳顾亮张小兴董磊彭长四
Owner SUZHOU UNIV