Molded article and production method therefor

1. A molded article comprising a copolymer comprising a tetrafluoroethylene unit and a perfluoro(alkyl vinyl ether) unit, wherein a surface roughness Ra of the molded article is 0.20 μm or less, and a water contact angle of the molded article is 75 degrees or less.

2. The molded article according to claim 1 , wherein a content of the perfluoro(alkyl vinyl ether) unit of the copolymer is 3.5 to 7.0% by mass based on all monomer units.

3. The molded article according to claim 1 , wherein a melt flow rate of the copolymer at 372° C. is 1 to 30 g/10 min.

4. The molded article according to claim 1 , which is a tube.

5. The molded article according to claim 1 , which is a tube through which a chemical liquid is passed, wherein a surface roughness Ra of a wetted surface is 0.20 μm or less, and a water contact angle of the wetted surface is 75 degrees or less.

6. A method for producing the molded article according to claim 1 ,

the method comprising performing plasma treatment for a treatment time of 50 seconds or less on the molded article heated to a surface temperature of 150° C. or higher.

7. The method according to claim 6 , wherein the plasma treatment is atmospheric pressure plasma treatment.

8. The method according to claim 6 , wherein a content of the perfluoro(alkyl vinyl ether) unit of the copolymer is 3.5 to 7.0% by mass based on all monomer units.

9. The method according to claim 6 , wherein a melt flow rate of the copolymer at 372° C. is 1 to 30 g/10 min.

10. The method according to claim 6 , further comprising obtaining the molded article by extrusion.

11. The method according to claim 6 , wherein the molded article is a tube.

12. The method according to claim 6 , further comprising washing the molded article obtained by the plasma treatment with water.

13. A method for washing a molded article, comprising washing the molded article according to claim 1 with water.