JP2010195022A - Method of manufacturing fiber-reinforced resin pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a coating on the outer peripheral surface of a fiber-reinforced resin pipe joint from peeling off as much as possible without giving a surface treatment. <P>SOLUTION: A reinforcement fiber bundle impregnated with a polymerizable resin composition containing a photopolymerization initiator is wound around a mold, the wound reinforcement fiber bundle is irradiated with light, the polymerizable resin composition with which the reinforcement fiber bundle is impregnated is cured, thereby a fiber-reinforced resin pipe joint 1 is fabricated. Next, the fiber-reinforced resin pipe joint 1 is demolded, thereafter the outer peripheral surface of the fiber-reinforced resin pipe joint 1 is ground slightly, or a few protrusions/recesses are formed, and thereby the rough surface processing of the outer peripheral surface of the fiber-reinforced resin pipe joint 1 is carried out. In addition, the outer peripheral surface of the fiber-reinforced resin pipe joint 1 on which the rough surface processing has been carried out is coated in a color same as the color of a main tube of a sewer or the like. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a fiber-reinforced resin pipe joint.

  Conventionally, fiber reinforced resin pipe joints have been widely provided because of their excellent workability due to their light weight. For example, as shown in Patent Document 1, this fiber reinforced resin pipe joint includes a polymerizable resin composition in which a photopolymerization initiator is blended in a drum-shaped mold that rotates in the circumferential direction while moving in the axial direction. The impregnated reinforcing fiber bundle is continuously wound, and the wound reinforcing fiber bundle is irradiated with natural light, ultraviolet light, or the like to cure the polymerizable resin composition impregnated in the reinforcing fiber bundle.

  On the other hand, fiber reinforced resin main pipes connected using such fiber reinforced resin pipe joints are usually colored with a gray color or the like because they are molded by adding a pigment such as a gray color to a thermoplastic resin composition. ing.

  On the other hand, when a pigment is added to a polymerizable resin composition containing a photopolymerization initiator of a fiber reinforced resin pipe joint, light is not transmitted or hardly transmitted, and the polymerizable resin composition is not cured. Therefore, a pigment cannot be added to the polymerizable resin composition. Thereby, the fiber reinforced resin pipe joint in which the polymerizable resin composition to which no pigment is added is cured has a yellowish green color which is the original fluorescent color. Moreover, the polymerizable resin composition of the fiber reinforced resin pipe joint has a property of yellowing over time. For this reason, when stock management of fiber reinforced resin pipe fittings is carried out and shipped after a certain period of time, the color of the colored fiber reinforced resin main pipe and the color of the yellowed fiber reinforced resin pipe fitting do not match. For the purpose of improvement, after molding of the fiber reinforced resin pipe joint, the outer peripheral surface is painted according to the color of the fiber reinforced resin main pipe.

JP 2003-175550 A

  By the way, when transporting the coated fiber reinforced resin pipe joint, the fiber reinforced resin pipe joint comes into contact with each other, or the paint peels off due to axial or circumferential sliding friction caused by a nonwoven rope wound as a cushioning material. There was a problem. In other words, in order to improve the adhesion of the paint, ground treatment such as degreasing treatment and primer treatment of the painted surface is indispensable. However, in the production line of fiber reinforced resin pipe joints, It is difficult to hold the processing surface. For this reason, the outer peripheral surface of the manufactured fiber reinforced resin pipe joint is coated without applying a ground treatment. As a result, during the transportation until reaching the customer, the paint detachment is caused by the direct contact between the fiber reinforced resin pipe joints or the indirect contact via the cushioning material.

  The present invention has been made in view of such problems, and a fiber reinforced resin pipe joint capable of preventing the peeling of the coating on the outer peripheral surface of the fiber reinforced resin pipe joint as much as possible without performing a ground treatment. The manufacturing method of this is provided.

  The present invention relates to a polymerizable resin in which a reinforcing fiber bundle impregnated with a polymerizable resin composition containing a photopolymerization initiator is wound around a mold, and the wound reinforcing fiber bundle is irradiated with light to impregnate the reinforcing fiber bundle. After the composition is cured to form a fiber reinforced resin pipe joint, the fiber reinforced resin pipe joint is demolded, and then the outer peripheral surface of the fiber reinforced resin pipe joint is roughened, and then the outer periphery of the fiber reinforced resin pipe joint. It is characterized by painting the surface.

  According to the present invention, a reinforced fiber bundle impregnated with a polymerizable resin composition containing a photopolymerization initiator is wound around a mold, and the reinforced fiber bundle is impregnated with light by irradiating the wound reinforcing fiber bundle with light. The resin composition is cured to form a fiber reinforced resin pipe joint. Next, after removing the fiber reinforced resin pipe joint, the outer peripheral surface of the fiber reinforced resin pipe joint is roughened by slightly polishing the outer peripheral surface of the fiber reinforced resin pipe joint or by forming slight irregularities. To do. And the outer peripheral surface of the fiber reinforced resin pipe joint by which the rough surface process was carried out is painted with the same color as fiber reinforced resin main pipes, such as a sewage pipe.

  As a result, in the manufacturing process of the fiber reinforced resin pipe joint, the adhesion of the paint can be enhanced by adding a rough surface processing of the outer peripheral surface, and the peeling of the coating can be prevented as much as possible. In addition, it is only necessary to roughen the outer peripheral surface of the fiber reinforced resin pipe joint, and it is not necessary to change the production line to the fiber reinforced resin pipe joint manufacturing process and install a ground treatment process. Since much work time is not required, an increase in manufacturing cost can be minimized.

  In the present invention, it is preferable to roughen the surface of the fiber-reinforced resin pipe joint by contacting a brush that rotates while the fiber-reinforced resin pipe joint is rotated.

  Here, as the brush, a commercially available wire brush or plastic brush can be used.

  In the present invention, it is preferable that the surface of the fiber-reinforced resin pipe joint is roughened by spraying sand or glass balls while the fiber-reinforced resin pipe joint is rotated.

  ADVANTAGE OF THE INVENTION According to this invention, peeling of the coating of the outer peripheral surface of a fiber reinforced resin pipe joint can be prevented as much as possible, without performing a surface treatment to the outer peripheral surface of a fiber reinforced resin pipe joint.

It is explanatory drawing which shows typically one Embodiment of the roughening process in the manufacturing method of the fiber reinforced resin pipe joint of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows an embodiment of rough surface processing in the method for producing a fiber-reinforced resin pipe joint of the present invention.

  The roughening of the outer peripheral surface of the fiber reinforced resin pipe joint 1 is performed by roughing the outer peripheral surface of the fiber reinforced resin pipe joint 1 and the pair of support rollers 2 and 2 that support and rotate the fiber reinforced resin pipe joint 1. And the brush 3 to be configured.

  Although not shown in detail, the brush 3 can be moved forward and backward through a cylinder between a processing position in contact with the outer peripheral surface of the fiber reinforced resin pipe joint 1 and a retracted position separated from the outer peripheral surface of the fiber reinforced resin pipe joint 1. And is configured to be rotatable by a motor.

  Next, the manufacturing process of the fiber reinforced resin pipe joint 1 will be described.

  First, as is well known, a reinforcing fiber bundle impregnated with a polymerizable resin composition containing a photopolymerization initiator is wound around a mold, and the wound reinforcing fiber bundle is irradiated with light to form a reinforcing fiber bundle. The impregnated polymerizable resin composition is cured to form the fiber reinforced resin pipe joint 1.

  Here, the resin is not particularly limited, and examples thereof include unsaturated polyester resins, epoxy resins, vinyl ester resins, urethane resins, acrylic resins, and the like, and unsaturated polyester resins are preferable.

  Photopolymerization initiators include (bis) acylphosphine oxide, camphorquinone, benzyl, trimethylbenzoyldiphenylphosphine oxide, methylthioxanthone, bis-bentadienyl titanium-di, aromatic diazonium salt, diaryl iodonium salt, sulfonium Examples thereof include salts and sulfonic acid esters, and these are used alone or in combination.

  The reinforcing fiber bundle is not particularly limited, and examples thereof include long fibers such as inorganic fibers such as glass fibers and carbon fibers, and organic fibers such as vinylon fibers and aramid fibers.

  If the fiber reinforced resin pipe joint 1 is molded, the diameter of the mold is reduced while the fiber reinforced resin pipe joint 1 is supported by an overhead crane or the like, the fiber reinforced resin pipe joint 1 is detached from the mold, and then the fiber reinforced resin is reinforced. The resin pipe joint 1 is lifted and conveyed, and its outer peripheral surface is placed on a pair of support rollers 2. If the fiber reinforced resin pipe joint 1 is placed on the pair of support rollers 2, the fiber reinforced resin pipe joint 1 supported on the pair of support rollers 2 is rotated by rotating the support roller 2. At the same time, the brush 3 is rotationally driven and advanced to the machining position. Thereby, the outer peripheral surface of the fiber reinforced resin pipe joint 1 rotated by the rotating brush 3 is slightly polished and roughened.

  When the rough surface processing of the fiber reinforced resin pipe joint 1 is finished, the brush 3 is retracted to the retracted position, and then the fiber reinforced resin pipe joint 1 is conveyed to the painting booth using an overhead crane or the like, and then the fiber reinforced resin is reinforced. In a state where the resin pipe joint 1 is supported and rotated, the paint is discharged from the spray gun, and the outer peripheral surface of the fiber reinforced resin pipe joint 1 is painted to the same color as the main pipe such as a sewer pipe. Thereafter, the fiber-reinforced resin pipe joint 1 may be cured and the paint may be dried.

  As a result, since the outer peripheral surface of the fiber reinforced resin pipe joint 1 is roughened, the contact area of the paint is increased and the adhesion of the paint is improved, thereby preventing the paint from peeling off. Specifically, the paint surface is not peeled off even if the paint surface is rubbed with a straight scale, and when the fiber reinforced resin pipe joint 1 is transported, it comes into contact with each other or indirectly through a cushioning material. As a result, peeling of the paint can be reduced as much as possible.

  In addition, it is not necessary to add a process for pretreatment of the outer peripheral surface of the fiber reinforced resin pipe joint 1 to the production line, and work time required for the pretreatment is also eliminated. Moreover, it is only necessary to perform a rough surface processing on the outer peripheral surface of the fiber reinforced resin pipe joint 1, and the cost increase can be minimized.

  In the above-described embodiment, the case where the outer peripheral surface of the fiber reinforced resin pipe joint 1 is roughened by the rotating brush 3 has been described. However, the surface roughening may be performed by shot blasting. For example, sand or glass balls or the like may be sprayed on the outer peripheral surface of the fiber reinforced resin pipe joint 1 to form a slight unevenness and roughen the surface.

  Further, when forming a fiber reinforced resin pipe joint, as a final step, a polyester nonwoven fabric impregnated with a polymerizable resin composition containing a photopolymerization initiator instead of a reinforcing fiber bundle was wound around the outermost peripheral surface and photocured. Then, a rough surface processing may be employed in which the roller is brought into contact with the polyester nonwoven fabric wound around the outermost peripheral surface so as to make the unevenness due to the polyester nonwoven fabric stand out.

1 Fiber reinforced resin pipe joint 2 Support roller 3 Brush

Claims (3)

  A reinforcing fiber bundle impregnated with a polymerizable resin composition containing a photopolymerization initiator is wound around a mold, and the wound reinforcing fiber bundle is irradiated with light to cure the polymerizable resin composition impregnated in the reinforcing fiber bundle. After forming the fiber reinforced resin pipe joint, the fiber reinforced resin pipe joint is demolded, and then the outer peripheral surface of the fiber reinforced resin pipe joint is roughened, and then the outer peripheral surface of the fiber reinforced resin pipe joint is painted. The manufacturing method of the fiber reinforced resin pipe coupling characterized by the above-mentioned.   2. The method of manufacturing a fiber reinforced resin pipe joint according to claim 1, wherein the surface of the fiber reinforced resin pipe joint is roughened by contacting a rotating brush with the fiber reinforced resin pipe joint rotated. To produce a fiber reinforced resin pipe joint.   The method for producing a fiber reinforced resin pipe joint according to claim 1, characterized in that sand or glass balls are sprayed on the outer peripheral surface of the fiber reinforced resin pipe joint in a state where the fiber reinforced resin pipe joint is rotated, and roughened. To produce a fiber reinforced resin pipe joint.

Images