A Precise and Continuous Controlling Method of Water Adhesion on PTFE Surface
A polytetrafluoroethylene and adhesion technology, used in metal processing equipment, welding equipment, manufacturing tools, etc., can solve the problems of cumbersome preparation procedures, large environmental pollution, slow processing speed, etc., to achieve simple and effective operation methods, environmental protection low pollution effect
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Embodiment 1
[0053] (1) Set the picosecond laser processing parameters, use a picosecond laser with a wavelength of 355nm, the laser spot diameter is 10μm, the scanning speed is 1000mm / s, the pulse frequency is 200KHz, the output power is 5W, and the laser scanning distance is changed from 5μm to 140μm, the increased width of each laser scan, that is, the scan step length is 5μm, on the focal plane, the surface clean PTFE is processed.
[0054] Then, the structure and properties of the laser-processed surface were determined.
[0055] figure 1 A scanning electron microscope (SEM) image of a non-laser-processed PTFE surface. It can be seen that the surface of PTFE without laser processing is very smooth and flat.
[0056] figure 2 It is the scanning electron microscope (SEM) picture when the laser scanning distance is 80 μm and 130 μm, respectively. It can be seen from the figure that when the laser scanning distance is 80 μm, the laser etching forms a square columnar protrusion, and t...
Embodiment 2
[0061] Put the polytetrafluoroethylene in acetone, absolute ethanol and distilled water, respectively, and use ultrasonic waves to clean each for 5 minutes to remove the pollutants adhered to the surface, and then dry to obtain a clean polytetrafluoroethylene surface.
[0062] Use a picosecond laser with a wavelength of 355nm, the laser spot diameter is 10μm, set the laser scanning rate to 1500mm / s, the pulse frequency to 200KHz, the output power to 8W, set the scanning step to 10μm, and set the laser scanning spacing to 60μm, 70μm, 80μm, 90μm, 100μm, 110μm and 120μm.
[0063] An optical contact angle measuring instrument was used to measure the rolling angle of water droplets on the surface of polytetrafluoroethylene after laser etching, and the test results are shown in Table 1 below.
[0064] Table 1: Example 2 shows the rolling angle of the surface of the polytetrafluoroethylene material prepared under different laser scanning distances.
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[0066]
[0067] I...
Embodiment 3
[0069] Put the polytetrafluoroethylene in acetone, absolute ethanol and distilled water, respectively, and use ultrasonic waves to clean each for 5 minutes to remove the pollutants adhered to the surface, and then dry to obtain a clean polytetrafluoroethylene surface.
[0070] Use a picosecond laser with a wavelength of 355nm, the laser spot diameter is 10μm, set the laser scanning rate to 1300mm / s, the pulse frequency to 200KHz, the output power to 6.5W, set the scanning step to 5μm, and set the laser scanning spacing respectively 55μm, 60μm, 65μm, 70μm, 75μm, 80μm, 85μm, 90μm, 95μm, 100μm, 105μm, 115μm and 120μm.
[0071] An optical contact angle measuring instrument was used to measure the rolling angle of water droplets on the surface of polytetrafluoroethylene after laser etching, and the test results are shown in Table 2 below.
[0072] Table 2: Example 3 shows the rolling angle of the surface of the polytetrafluoroethylene material prepared under different laser scannin...
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