Manufacturing method of tube-attached coupling structure and tube-attached coupling structure
A tube-attached coupling structure is provided by using a piping coupling with good compatibility, workability and processability. A manufacturing method of the tube-attached coupling structure includes a step of preparing a photocurable gel-like body in a hollow cylindrical shape, a step of fitting the photocurable gel-like body in the attaching hole, a step of inserting an end portion of a connection tube into a hollow hole of the photocurable gel-like body, and a step of curing the photocurable gel-like body by irradiating the photocurable gel-like body with light.
1 . A manufacturing method of a tube-attached coupling structure in which a connection tube is attached to a base body having an attaching hole, the method comprising the steps of:
preparing a photocurable gel-like body in a hollow cylindrical shape;
fitting the photocurable gel-like body into the attaching hole;
inserting an end portion of the connection tube into a hollow hole of the photocurable gel-like body; and
curing the photocurable gel-like body by irradiating the photocurable gel-like body with light,
wherein the step of preparing the photocurable gel-like body includes producing the photocurable gel-like body in the hollow cylindrical shape by pouring a solution of a photocurable gel-like body before gelation into a molding die,
the solution contains a polyfunctional urethane (meth) acrylate and a photopolymerization initiator, the solution is heated after being poured into the molding die to form the hollow cylindrical photocurable gel-like body, and
the hollow cylindrical photocurable gel-like body obtained after molding and heating has elastic self-moldability before photocuring and is capable of expanding outward to fit the inner wall of the attaching hole after inserting the connection tube.
2 . The manufacturing method of a tube-attached coupling structure of claim 1 , wherein the attaching hole has a reverse tapered shape in which a diameter expands toward an inside from a surface of the base body.
3 . The manufacturing method of a tube-attached coupling structure of claim 1 , wherein the base body has annular, spiral or dot-shaped irregularities, on an inner surface of the attaching hole.
4 . The manufacturing method of a tube-attached coupling structure of claim 1 , wherein the photocurable gel-like body includes polyurethane.
5 . The manufacturing method of a tube-attached coupling structure of claim 4 , wherein the photocurable gel-like body has hardness of E1 or more and E30 or less by measurement by a durometer based on JIS K 6235.