Molded article and hollow tube
A coating film is provided in a cable, a medical hollow tube, a molded article and a hollow tube. The coating film is formed from a rubber composition including a rubber component and fine particles. A static friction coefficient on a surface of the coating film is 0.5 or less. When the coating film is subjected to a testing such that a long fiber non-woven fabric including cotton linters including an alcohol for disinfection with a length of 50 mm along a wiping direction is brought contiguous to the surface of the coating film at a shearing stress of 2×10 −3 MPa to 4×10 −3 MPa, followed by wiping off the surface of the coating film at a speed of 80 times/min to 120 times/min and 20,000 repetitions thereof for a wiping direction length of 150 mm, a difference (an absolute value of a difference) between the static friction coefficients of the coating film before and after the testing is not greater than 0.1.
1. A molded article, comprising:
a molded article main body; and
a coating film covering a surface of the molded article main body, the coating film adhering to the molded article main body,
wherein the coating film comprises an addition reaction type silicone rubber composition and particles that form surface irregularities to reduce a static friction coefficient of the coating film and has an average particle diameter of 1 μm or more and 10 μm or less, with a static friction coefficient on a surface of the coating film being between about 0.1 and 0.5 as measured by engaging the coating film against another body coated with the coating film at a normal force of 2N,
wherein the coating film comprises a resistance to being wiped off in such a manner that, when the coating film is subjected to a testing such that a long fiber non-woven fabric including cotton linters including an alcohol for disinfection with a length of 50 mm along a wiping direction is brought contiguous to the surface of the coating film at a shearing stress of 2×10 −3 MPa to 4×10 −3 MPa, followed by wiping off the surface of the coating film at a speed of 80 times/min to 120 times/min and 20,000 repetitions thereof for a wiping direction length of 150 mm, an absolute value of a difference between the static friction coefficients of the coating film before and after the testing is not greater than 0.1 as measured by engaging the tested coated film against an untested coating film at a normal force of 2N, and
wherein, in the surface of the coating film, the number of voids comprising a size equal to or larger than 1 μm is not more than 5 per 40 μm x 40 μm area.
2. The molded article according to claim 1 , wherein an adhesion strength between the molded article main body and the coating film is between about 0.30 MPa and 0.70 MPa.
3. The molded article according to claim 1 , wherein the particles include at least any one of silicone resin particles, silicone rubber particles, and silica particles.
4. The molded article according to claim 1 , wherein the particles have a higher hardness than that of the rubber component.
5. The molded article according to claim 1 , wherein the coating film comprises a thickness of 3μm or more and 100 μm or less.
6. The molded article according to claim 1 , wherein, when the number of the particles visible at a magnification level of 1000 X in 40 μm x 40 μm area is measured in four different areas of the surface of the coating film, a number distribution, which is calculated from a formula (N max −N min / (N max +N min )×100 where N max is a maximum value of the number of the particles in the four 40 μm x 40 μm areas and N min is a minimum value of the number of the particles in the four 40 μm x 40 μm areas, is not more than 5%.
7. The molded article according to claim 1 , wherein the molded article main body is a hollow tube main body and the coating film covers at least one of an inner surface and an outer surface of the hollow tube main body.