Molded article and manufacturing method for molded article
The invention provides a molded article containing a specific fluororesin and having excellent hydrophilicity. The molded article containing the fluororesin has a melt flow rate of 1.00 g/10 min or lower and a water contact angle of 90° or smaller. The fluororesin contains at least one copolymer selected from the group consisting of a copolymer containing a tetrafluoroethylene unit and a perfluoro(alkylvinylether) unit and a copolymer containing a tetrafluoroethylene unit and a hexafluoropropylene unit.
1. A molded article comprising a fluororesin,
a surface of the molded article having a water contact angle of 90° or smaller,
the fluororesin containing at least one copolymer selected from the group consisting of a copolymer containing a tetrafluoroethylene unit and a perfluoro(alkylvinylether) unit and a copolymer containing a tetrafluoroethylene unit and a hexafluoropropylene unit, and
the whole of the molded article having a melt flow rate of 0.20 g/10 min or lower,
the molded article is obtained by molding the fluororesin to provide an untreated molded article and irradiating the untreated molded article at a temperature of 110° C. to 240° C. in the presence of air.
2. The molded article according to claim 1 ,
wherein the molded article contains 100 to 1000 functional groups on at least a surface thereof per 10 6 carbon atoms in a main chain, and
the functional groups include a —OH group, a —COF group, and a —COOH group.
3. The molded article according to claim 1 ,
wherein the molded article is a tube.
4. A method for manufacturing the molded article according to claim 1 , the method comprising:
molding a fluororesin to provide an untreated molded article; and
irradiating the untreated molded article with 40 to 100 kGy of radiation at 110° C. to 240° C. in the presence of air,
the fluororesin containing at least one copolymer selected from the group consisting of a copolymer containing a tetrafluoroethylene unit and a perfluoro(alkylvinylether) unit and a copolymer containing a tetrafluoroethylene unit and a hexafluoropropylene unit.
5. The method for manufacturing the molded article according to claim 4 ,
wherein the irradiation causes a melt flow rate increasing rate of 0% or lower.
6. The method for manufacturing the molded article according to claim 4 ,
wherein the radiation is an electron beam.
7. The method for manufacturing the molded article according to claim 4 ,
wherein the irradiation is performed at a temperature lower than a melting point of the fluororesin.
8. The method for manufacturing the molded article according to claim 4 ,
wherein the molded article is a tube.
9. The molded article according to claim 1 , wherein the whole of the molded article has a melt flow rate of <0.1 g/10 min.