JPS60183130A - Forming of frp joint - Google Patents

Abstract

PURPOSE:To obtain a fiber reinforced plastic joint of improved appearance and performance by winding a continuous, stranded mat around the outside of a heat resistant vinyl chloride resin joint and by pouring and impregnating thermosetting resin into it and hardening it. CONSTITUTION:After a cotton-like continuous, stranded mat 2 is wound over a heat resistant vinyl chloride tee joint (HT joint) in a thickness as required, the HT joint 1 is placed into the mold 3b of a mold 3 which has a caving formed with an identical shape but a little wider than the above HT joint. An upper mold 3a is placed to close the cavity and unsaturated polyester resin is poured from a portion of the mold 3 and the stranded mat 2 is impregnated and is left to be hardened. Then, also into the mold 3 the HT joint 1 over which the above stated mat 2 is wound is placed and closed tightly and, thereafter, unsaturated polyester resin is poured and the mat 2 is impregnated with the resin and is left to be hardened to form FRP joint A.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming an FRP joint used for a pipe 41J for transporting a high-temperature, high-pressure acid/alkali aqueous solution, and further relates to a method for forming an FRP joint using A process, specifically F"RP using a resin injector.
This invention relates to a method for forming a joint.

Conventionally, joints for plant piping that transport high 7n+ acid/alkaline solutions have been plated inside special metal joints, lined with special resin to improve corrosion resistance, and to prevent high-temperature deterioration. However, due to the weak bonding force with the metal, the plating and lining film may peel off, reducing the performance of the joint. Therefore, plating and lining work must be repeated each time, and piping Afterwards, such work is inevitable, and in many cases, the piping must be replaced after all, resulting in various problems such as extremely high costs and troublesome piping work. there were.

The present invention has been made to solve these conventional problems, and its purpose is to achieve F Rl in almost the same molding cycle as injection molding of thermoplastic resin using a mold.
An object of the present invention is to provide a method for molding an FRP joint by which the joint can be continuously molded to produce a product with good quality in both appearance and performance.

That is, in order to achieve this objective, the method for molding an FRP joint of the present invention involves placing a heat-resistant vinyl chloride elf (continuous strand mat wrapped around the outside of a fat joint into a mold, This thermosetting resin is injected into the continuous strand mat, uniformly impregnated and cured, and then integrated with heat-resistant PVC resin joints to form the desired shape and FI method product. F+< by resin injection, which is characterized by
The configuration was such that a P-joint was formed.

Embodiments of the present invention will be described below with reference to the drawings.

First, a heat-resistant vinyl chloride cheese joint (hereinafter referred to as an IHT joint) with the designation 251@/+a (hereinafter referred to as an IHT joint) was wound with a cotton-like continuous strand man (2) at a length of 11γ. A space of the same shape is placed in a mold 3 having a cavity slightly wider than the 14°r joint 1.

The gold plate 3 is formed into two halves, upper and lower, and the lower mold 31
), and after closing the lower mold 3a,
A saturated polyester resin 4' is injected into a part of the mold 3, and the unsaturated polyester resin is impregnated into the continuous strand 2, and the resin is naturally cured.

Next, in the same manner as above, for another mold 3, 14'"joint 1
After putting the continuous strand mat (pine) 2 wound on top and sealing it, unsaturated polyester resin is injected to impregnate the continuous strand mat 2 with the resin and let it harden naturally to form the FRP joint A. Shape.

In the index molding method normally used, a large number of products can be molded in one cycle by fixing the mold, injecting the resin, and cooling and hardening it. In the method, a large number of molds 3 are fixed on a rotatable support plate 4, thermosetting resin is injected into the molds 3 through a nozzle 5, and then the support plate 4 is rotated. The nozzle 5 is connected to the injection port 6 of the next mold 3, and the thermosetting resin is injected and allowed to harden naturally.

In this way, the molds 3 were fixed to the support plate 4 one after another.
It is manufactured continuously while injecting thermosetting resin into the mold.

In addition, the designation 25+n/+11 is an embodiment of the present invention.
After wrapping the continuous strand mat around the cheese joint, unsaturated polyester resin is injected into the F
As a result of testing the RP layer formed to a thickness of 2 m/+-, it showed a hydraulic breakdown value of 110 kB/cJ in hot water at 100°C. By the way, the blank l-11'1. The hand deformed as soon as it was passed through hot water at +00'C.

In order to complete the present invention, it is necessary to uniformly impregnate the unsaturated polyester resin into the glass fibers at a low injection pressure. In order to achieve this, it is important that the unsaturated polyester resin passes through the glass fiber assembly at a considerable speed and remains inside the glass fiber.We conducted many tests to find a glass fiber that satisfies this requirement. , continuous 7th strand manoto was proven to be optimal.

Continuous Strand Mat is made of layers of continuous strands, so it has elasticity in the thickness direction, so even if unsaturated polyester resin is injected at a considerable speed, the mat will not be washed away. In addition, even if the wall thickness fluctuates, since it has elasticity in the thickness direction, it acts to prevent cracks in the product and smoothly removes gases such as air remaining between the joint and the glass m fiber. In order to ensure that the joint can be pulled out evenly, the conventional hand-rearing joint method requires secondary processing to prevent the gas from coming out (this prevents unevenness on the product surface). Even if the Asstrand mat is wound and unsaturated polyester resin is injected, no gas remains at the interface between the mat and the joint, no adhesive peeling occurs from the interface, and it is able to hold significantly large tensile and compressive loads. It is.

Hereinafter, one embodiment of the method of the present invention has been explained based on an HT cheese joint, but the method of the present invention can be applied to various sizes of li' elbow joints, HT socket joints, HT reducers, and HT bend joints. Of course, by using multiple molds, the shaping cycle can be shortened to less than one minute, similar to injection molding.

As described above, according to the method of the present invention, a continuous strand mat is wound around the outside of an IIT joint to a required thickness, and then placed in a mold and injected with unsaturated polyester resin.
The continuous strand mat is uniformly impregnated with resin and combined with the IIT joint to form an efficient FRF' joint that is resistant to heat, acid, and alkali, and the appearance is similar to that of the conventional handrail joint. The 011 handle is more beautiful in comparison, and does not deform at all even with the high heat generated during the curing of the unsaturated polyester resin, so it does not lose its shape and can be reliably connected to pipes.

In addition, since the product is molded and formed, there is little variation in product weight and physical performance can be maintained constant, making it possible to provide FRP joints with stable quality.

[Brief explanation of drawings]

Figure 1 is a front view of the F'RP cheese joint, Figure 2 is 111
*, A front view of the continuous strand mat wound around the hand, tIS 3 is a perspective view showing the main parts of the method of the present invention, and FIG. 4 is a cross-sectional view of the FR]' joint formed by the method of the present invention. , FIG. 5 is a perspective view showing an example of the molding apparatus. A: Fl and P joint 1: Heat-resistant vinyl chloride cheese joint 2; Continuous strand mat 3: Mold patent applicant Kyushu Makisui Kogyo Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1) Place the continuous strand mat wound around the outside of the heat-resistant PVC resin joint into a mold, inject thermosetting resin into the mold, and inject the thermosetting resin into the continuous strand mat. A method for molding l:Rl) joints by resin innoection, which is characterized by uniformly impregnating and curing the resin and integrally bonding it with a heat-resistant vinyl chloride resin joint to mold a product with a desired shape and dimensions.