Apparatus for electrostatically coating a workpiece and method of reducing contamination thereof
An electrostatic coating and workpiece technology, applied to the surface coating liquid device, spray discharge device, spray device, etc., can solve the problem of being easily scratched, and achieve the effect of improving productivity
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example 1
[0044] A sample of POM was coated with a silica sol coating called H 5068 and supplied by FEW Chemicals GmbH. The surface of the samples was treated with plasma prior to coating in order to enhance the adhesion of the coating. Application is by means of spraying.
[0045] The contact angle of water on the surface of the coated sample was measured at five points using a test device DM500 from Kyowa Interface Science Corporation and a droplet volume of 10 μl. The contact angle was measured to be 108°. The contact angle with n-hexadecane after coating was determined to be 67° by the same method.
example 2
[0047] The soiling properties of the samples were tested by spraying the samples according to Example 1 with a waterborne paint for 30 seconds with an air spray gun operated at an air pressure of 0.6 MPa. The sample is placed in the center of the spray pattern and about 50 cm from the gun.
[0048] The samples were dried in an oven at 80°C for about one hour. A first picture of the surface is then taken. The samples are then soaked in a water-based diluent for about one minute. Water-based diluents consist of butyl cellosolve, water, dimethylamine, isopropanol, and ethyl acetate. Wipe off excess liquid on the surface and take a second picture of the sample. Image analysis was performed on the photographs to quantify the extent of paint and paint removal (color-to-background ratio).
[0049] For comparison, the same test procedure as above was performed on an uncoated sample of POM.
[0050] Quantitative image analysis of the first photograph showed that the coated sample ...
example 3
[0053] The samples of Example 1 were exposed to the solvent by wiping the surface of the sample with methyl ethyl ketone (MEK). The contact angle of water on the surface was measured in the same manner as in Example 1.
[0054] The samples were then exposed to the paint by splashing the solvent-borne paint on half the sample. The samples were then allowed to dry for approximately one hour before being swabbed again with MEK. The contact angle of water on the surface is then measured. This procedure was repeated four times and the contact angle was measured after each repetition.
[0055] The results of the contact angle measurements indicated that neither the contact angle of water nor that of n-hexadecane was changed by the exposure.
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