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Preparation of Superhydrophobic Coating and Study of Application

Author: JiangQiangWei
Tutor: HuangChengYa;WangHuiMin
School: South China University of Technology
Course: Materials Engineering
Keywords: contact angle superhydrophobic surface micro nano structure heat resistance property scrub resistance property
CLC: TQ171.68
Type: Master's thesis
Year: 2011
Downloads: 72
Quote: 0
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Abstract


The superhydrophobic coating was prepared through compositing hollow glass beads (HGB) and tetraethyl orthosilicate (TEOS), modifying by production of ring opening polymerization of D4. The contact angle was 151.7±1°. The contents of HGB and TEOS were discussed, they had a great effect on the coating contact angle and transmission. What’s more, the heat resistance of coating was researched. Aluminium alloy was etched by hydrochloric acid, when it was modified by silicone resin coating, it became to be a superhydrophobic surface, the contact angle was 155.4±1°. when it was modified by G502, the contact angle was a little lower. Time of etching aluminium alloy was discussed, it had a effect on the contact angle. The process of synthesizing silicone resin was researched and it had a effect on scrub resistance property. What’s more, the heat resistance of aluminium alloy superhydrophobic surface was researched.The results showed that the content of HGB, content of TEOS had a great effect on the contact angle. When the content of HGB was less, the distance of particles got to be far, so the contact angle was small. When the content of HGB was 1.2wt%, the contact angle would be 151.7±1°. With the content of HGB added, the transmittance was decreased. The coating still have a great hydrophobic after being processed on the condition of 200℃. However, the coating became to be superhydrophilic on the condition of 300℃.When the concentration of hydrochloric acid was 3.3wt%, the etching time had a great influence on aluminium alloy superhydrophobic surface. If the etching time was 3 hours, the surface would get a plenty of micro nano structure. If the concentration of hydrochloric acid was higher, the reaction time could be less. After the etched aluminium alloy modified by G502, the contact angle was 143.7±1°. However, the scrub resistance property was bad. It demonstrated that the adhesive power between G502 and substrate was small. After the etched aluminium alloy modified by silicone resin, the contact angle was 155.4±1°. took the sample to scrub resistance test, the contact angle was nearly 130°after scrubbing 5000 times. aluminium alloy surface modified by silicone resin had a great heat resistance, the coating could resist 280℃. When the temperature reached to 310℃, silicone resin was decomposed, and the contact angle was decreased. In this paper, we researched the fluid flowed property of aluminium alloy tube. Analyzed the flowed fluid between superhydrophobic tube and normal tube. The result showed that the superhydrophobic tube had a anti drag property than normal tube. The superhydrophobic surface cause the surface slip, it made the anti drag phenomenon. Results showed that the biggest ratio of anti drag was 84.5%.

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CLC: > Industrial Technology > Chemical Industry > Silicate > Glass Industry > Production process and equipment > Products processing ( re- forming ) and equipment
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