Nanosilica-coated components with enhanced durability
A technology of silica, coating composition, applied in the direction of coating, nanotechnology for materials and surface science, nanotechnology, etc., capable of solving satisfactory problems, etc.
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[0248] testing method :
[0249] Static water contact angle measurement [W.C.A.]
[0250] The static water contact angle measurement was performed using deionized water available from Millipore Corporation. The contact angle analyzer used was a video contact angle analyzer "VCA Optima" (available from AST Products Inc.). Thirty seconds after deposition, the static contact angle was measured on a fixed drop (1 μL). The recorded value is the average of at least 4 individual measurements.
[0251] Dry wear test
[0252] The dry wear test was performed on a reciprocating abrasion machine (model 5900, available from TABER INDUSTRIES). The dry abrasion was tested by using a force of 14N and a speed of 35 cycles / min (1380g weight). The cloth used for the test is 13.5 Crockmeter cloth (Crockmeter squares, 100% cotton).
[0253] Wet wear test
[0254] The wet abrasion test was performed on a reciprocating abrasion machine (model 5900, available from TABER INDUSTRIES). The wet abrasion w...
example
[0308] Examples 1 to 3, Comparative Example C-1 and Reference Example Ref-1
[0309] In Examples 1 to 3, the PMMA-1 substrate was first coated with the primer composition of GPTMOS in ethanol at the concentration given in Table 2. The primer is applied and dried according to the general procedure as given above. After the substrate was cooled to room temperature, the silica nanoparticle composition SIL-3 was coated on top of the dried primer coating (Meyer bar 6). The coated substrate was heated in an oven at 80°C for 10 minutes. The static water contact angle was measured before dry abrasion ("WCA[°]initial") and after ("WCA[°]dry abrasion"). The results are shown in Table 2. The value recorded for Comparative Example C-1 was obtained on a PMMA-1 substrate coated with the silica nanoparticle composition SIL-3 without a primer coating. The values recorded for Ref-1 were obtained on uncoated PMMA-1 substrates.
[0310] Table 2 :
[0311]
[0312] Examples 4 to 8, Comparativ...
example 9 to 11 and comparative example C-3
[0317] In Examples 9 to 11, the PMMA-2 substrate was first coated with the heat activated primer composition (5 wt% ethanol) as given in Table 4. The primer composition is coated and dried according to the general procedure as given above. After the substrate was cooled to room temperature, the silica nanoparticle composition as given in Table 4 was coated on top of the dried primer coating (Meyer bar 6). The coated substrate was heated in an oven at 80°C for 10 minutes. The static water contact angle was measured before wet wear ("WCA[°]initial") and after wet wear ("WCA[°]wet wear") and after dry wear ("WCA[°]dry wear"). The results are listed in Table 4. The value recorded for Comparative Example C-3 was obtained on a PMMA-2 substrate coated with the silica nanoparticle composition SIL-3 without the primer composition.
[0318] Table 4 :
[0319]
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