JPS6233626A - Method for forming fiber-reinforced plastic tubular bodies - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a method for molding a tald1 reinforced plastic tubular body. After the synthetic resin liquid has hardened, it is rolled up and hard-molded to form a pipe joint, or the outer peripheral surface of the synthetic resin pipe is wound with glass fiber impregnated with the synthetic resin liquid, and the synthetic resin liquid is hardened. , relates to a method of forming a composite tube.

[Conventional technology]

The method for molding fiber-reinforced plastic pipe joints and composite pipes is to add and mix hardening agents, accelerators, etc. to liquid polyester resin, epoxy resin, etc., place the mixture in a tank, and pass glass fibers through the tank. This is then impregnated with the synthetic resin liquid and wound around the outer peripheral surface of a mold or synthetic resin pipe, and the synthetic resin liquid is cured. The so-called wet method has been known for a long time.

[Problem that the invention seeks to solve]

In the above wet method, when using a synthetic resin liquid that takes a long curing time, it is necessary to heat it in order to shorten the time required for curing and improve productivity. On the other hand, when using a synthetic resin liquid with a short curing time, there is no need to heat it as described above, but it will begin to harden in the tank and will continue to harden by the time it is wound around a mold, etc. 1) It was not possible to obtain a product that was satisfactory in terms of strength, and there were also drawbacks such as it was troublesome to clean the tank etc.

The present invention is a method for molding a fiber-reinforced plastic tubular body by a wet method, but it solves the above-mentioned problems, and a curing agent is added to the synthetic resin liquid for impregnating glass fibers. By separating the synthetic resin solution into which an accelerator is added and the curing agent not added, and impregnating separate glass fibers with each synthetic resin solution and winding them, the glass fibers are heated not only in the tank, but also at least immediately before winding. In other words, the synthetic resin liquid starts to harden immediately before or after winding the glass fibers around a mold, etc. for the molding of a fiber-reinforced plastic tubular body. The present invention provides a method.

[Means for Solving the Problems] The present invention involves winding glass fibers impregnated with a synthetic resin liquid around the outer peripheral surface of a mold or a synthetic resin pipe, and curing the synthetic resin liquid to form the fibers. This is a method of molding a reinforced plastic tubular body, in which the synthetic resin liquid impregnated into glass fibers is divided into synthetic resin liquids with a curing agent added but no accelerator, and synthetic resin liquids with an accelerator added but no curing agent added. It is divided into resin liquid and resin liquid. Also, the amount of glass fiber to be wound is approximately 2
One glass fiber is impregnated with a synthetic resin liquid containing a hardening agent, the other glass fiber is impregnated with a synthetic resin liquid containing an accelerator, and these glass fibers are wound in a mold, etc. It is characterized by contacting immediately before or after winding.

[Action of the invention]

In the molding method of the present invention, the synthetic resin liquid to be impregnated into the glass m fibers is divided into two types: one to which a curing agent is added but no accelerator, and one to which an accelerator is added but no curing agent is added. Separate glass mfas are impregnated with each synthetic resin liquid. This synthetic resin liquid does not harden by itself, but when mixed together, the curing agent and accelerator react and harden. The synthetic resin liquids do not mix until they come into contact with each other, so they will not harden until then.
When separate glass m fibers impregnated with each synthetic resin liquid are brought into contact with each other just before or after winding around a mold, the synthetic resin liquids mix, and the curing agent of one synthetic resin liquid is mixed. and the other's accelerator react and begin to harden.

〔Example〕

Embodiments of the invention will now be described with reference to the accompanying drawings.

FIG. 1 is an explanatory diagram of the case of molding a composite pipe, and FIG. 2 is an explanatory diagram of the case of molding a reinforced plastic pipe.

As shown in FIG. 1, the present invention involves winding glass fibers impregnated with a synthetic resin liquid around the outer peripheral surface of a synthetic resin pipe 1, and curing the synthetic resin liquid to form a composite pipe. The synthetic resin liquid is divided into a synthetic resin liquid 2 to which a curing agent is added but no accelerator, and a synthetic resin liquid 2 to which an accelerator is added but no curing agent is added. One synthetic resin liquid 2 is a mixture of liquid polyester resin and epoxy resin with addition of curing agents, colorants, fillers, etc., and the other synthetic resin liquid 2 is a mixture of liquid polyester resin and epoxy resin. It is a mixture of accelerators, colorants, fillers, etc., and the amount of glass fibers wound around the outer circumferential surface of the synthetic resin tubes 1, which are stored in resin tanks 3 and 3 separately, is approximately 2. and impregnate each with a separate synthetic resin liquid. That is, one of the glass fibers 4 is passed through the resin bath 3 and impregnated with the synthetic resin liquid 2 to which a curing agent has been added. The other glass fiber, llI4, is passed through a resin tank 3 to be impregnated with a synthetic resin liquid 2 to which an accelerator is added. In this step, each synthetic resin liquid 2.2 is made of glass fiber impregnated with synthetic resin 2, which does not mix, and glass fiber 4 impregnated with synthetic resin liquid 2, which is alternately formed into one guide. 5 and then wound around the outer peripheral surface of the synthetic resin pipe 1. Guide part 5
is located near the synthetic resin pipe 1, and when passing through the guide portion 5, the glass fibers 4 and 4 come close to each other, and the synthetic resin liquid 2.2 impregnated in them contacts and mixes. Fit. Synthetic resin liquid when passing through guide part 5? , 2 do not mix, when each glass #a fiber 4.4 is wound around the outer circumferential surface of the synthetic resin tube 1, each glass magnetic core mixes with the synthetic resin liquid 2.
．． Only when the two are mixed together, the curing agent and accelerator react and begin to harden.

FIG. 2 shows a case where glass fiber impregnated with a synthetic resin liquid is wound around the outer peripheral surface of the mandrel 7 to form a fiber-reinforced plastic tube. One of the glass fibers 4 is passed through a resin bath 3 and impregnated with a synthetic resin liquid 2, and the other glass fiber 4 is passed through a guide section 5 running in the resin bath, coated with a mold release agent 6, and then attached to a mandrel. 7. Wrap it several times in a criss-cross pattern around the outer circumferential surface of 7. Until both glass fibers 4.4 are wound,
Since the synthetic resin liquids 2 and 2 do not mix, they do not harden. When the glass m fiber 4.4 is wound around the outer circumferential surface of the mandrel 7, they come into contact and the synthetic resin liquid 2.2 mixes. After the synthetic resin liquid is cured, it is released from the mold.

Note that the means for impregnating the glass fiber with the synthetic resin liquid and the means for bringing the glass fiber impregnated with the synthetic resin liquid into contact immediately before winding are not limited to those described above.

〔Effect of the invention〕

As described above, according to the present invention, curing does not proceed in the step of impregnating glass fibers with a synthetic resin liquid, and glass m!
Since the synthetic resin liquid begins to harden immediately before or after winding In into a mold, it is possible to use a synthetic resin liquid with a short curing time, improving productivity and making it a fiber-reinforced plastic with excellent strength. A tubular body can be formed. Also,
This has advantages such as easy cleaning of the resin tank and the like.

[Brief explanation of drawings]

The drawings show embodiments of the present invention; FIG. 1 is an explanatory diagram of the case of molding a composite pipe, and FIG. 2 is an explanatory diagram of the case of molding a reinforced plastic pipe. is a resin tank, 4.4 is a glass tara, 5 is a guide part, 7
indicates a mandrel.

Claims (1)

[Claims] In forming a fiber-reinforced plastic tubular body by winding glass fiber impregnated with a synthetic resin liquid around the outer peripheral surface of a mold or synthetic resin pipe and curing the synthetic resin liquid,
A synthetic resin liquid with a curing agent added but no accelerator;
Divide the glass fiber into a synthetic resin solution with an accelerator added and no curing agent added, divide the amount of glass fiber to be wound into about 2 parts, impregnate one glass fiber with the synthetic resin solution with a curing agent added, The other glass fiber is impregnated with a synthetic resin liquid to which an accelerator has been added, and the glass fibers are brought into contact with each other immediately before or after winding around a mold, etc. Molding method.