JPS5948120A - Continuous draw forming of heat resisting fiber reinforced plastic pipe - 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] The invention relates to a continuous pultrusion method for heat-resistant FRP pipes.

Conventionally, in pultrusion molding of FRP pipes, the core material tube has a low heat resistance temperature (approximately 65 to 75°C), so glass fibers are wound in a 8-way loop, coated with thermosetting resin such as polyester resin, and placed in a curing furnace. It is cured by heating, but as mentioned above, the heat deformation temperature of the core tube is low, so it is not possible to increase the curing temperature, so it must be cured at a low temperature for a long time! The 1-nia V property was low at Q,5+n/min to 20 m/min, making it economically unsuitable, and the produced product was not an FRP pipe with excellent heat resistance that would allow the passage of high-temperature water such as hot spring water. .

In the method of the present invention, by using heat-resistant vinyl chloride resin (chlorinated vinyl chloride resin) as the core material, the heat distortion temperature can be raised to 85°C or higher, the temperature of the curing furnace can be raised, and JjRP
By accelerating the hardening of the pipe and improving productivity to 5m/min to 10m/min, we can mold FRP pipes with high heat resistance and supply hot spring water and water supplies. j! Heat-resistant FRP that can be used as a pipe replacement for pipe hats
It is an object of the present invention to provide a continuous pultrusion method for pipes.

The present invention includes an inner core layer forming process in which a polychlorinated vinyl chloride pipe is continuously formed by extrusion molding, and a glass roving impregnated with a thermosetting resin composition is attached to the outer periphery of the inner core layer in the axial direction. Then, glass fiber is wound diagonally on top of the FRP layer, which is then hardened from the surface and inside through an ultraviolet curing furnace and a far infrared curing furnace. The coating layer manufacturing process of extrusion coating thermoplastic resin on the surface and cooling and taking it off, and this FRP
A continuous pultrusion method for MFRP-resistant MFRP pipes, characterized by a continuous series of steps: a cutting step of cutting the pipe into a certain length, and a post-curing step of curing the cut FRP pipe at a required temperature for a certain period of time. This is related to.

II. Embodiments of the continuous pultrusion method of the present invention will be described.

The inner core layer manufacturing process is a process in which heat-resistant vinyl chloride pipes are continuously manufactured by extrusion molding, then cooled by water cooling, and the inner core layer is taken off at a constant speed.

Here, the heat-resistant vinyl chloride pipe refers to an extruded pipe made of chlorinated vinyl chloride resin and having a heat-resistant temperature of 85°C or higher.

Next, in the FRP layer manufacturing process, a thermosetting resin is supplied to a dipping tank from an automatic resin supply device that automatically mixes and supplies thermosetting resin with a catalyst and a curing agent, and passes it through the dipping tank. A glass roving impregnated with a thermosetting resin is cured and surrounded in the axial direction around the outer periphery of the inner core layer, and then a glass roving or glass yarn is wound diagonally over it, and then surface hardening with ultraviolet rays and internal hardening with far infrared rays. This refers to a process in which

Here, thermosetting resin refers to unsaturated polyester resin,
Refers to oligoacrylate resin, epoxy resin, phenolic resin, etc.

Additives used in the present invention, Id, and an ultraviolet initiator (tertiary, pugil, and
(perbenzoate, etc.), a hardening agent that promotes internal curing by far infrared rays (methyl ethyl ketone peroxide, 6% cobalt naphthenate, etc.)), and a high-temperature hardening agent. .

Next, the first coating layer production process involves extrusion coating a thermoplastic resin such as polyethylene resin or polyurethane resin on the surface of the Il'LP layer, cooling it with water, and taking the cooled tube at a constant speed. That's what I mean.

Next, the cutting process is performed as described above with the continuously manufactured inner core layer and FR.
This system automatically cuts a composite pipe made of PWI and a coating layer to a certain length.

Next, in the post-curing process, the cut FRP pipe is cured almost completely to stabilize its physical properties.
It is a 15m tunnel type hardening furnace, and the temperature inside the furnace is 50~50m.
65°CK is maintained, and 10 to 14 FRP pipes are placed inside this furnace.
This refers to the process of putting in the water for about an hour.

The method for forming the heat-resistant FRP pipe of the present invention has been explained above, but
According to the present invention, since the FRP pipe is completely cured, it has the characteristic that it can be used as a product immediately after production.

? ! An example of a specific implementation of the method of the present invention will be described based on the drawings.The extruder 1 has an inner diameter of 30 mm and an outer diameter of 34
5 m of heat-resistant vinyl chloride pipe (chlorinated vinyl chloride pipe)
The material is extruded at a speed of 1/2 minute, is passed through water in a cooling tank 2 and cured into a circular shape while being subjected to sizing, and then pulled out from a tensile machine 3.

Subsequently, glass rovings installed on the glass roving frames 4, 4 are attached so as to surround the outer periphery in the axial direction of the heat-resistant vinyl chloride pipe Pi (hereinafter referred to as heat-resistant vinyl chloride pipe), and the glass rovings are is impregnated into the impregnating device 5.

An automatic supply device 6 (shown in FIG. 2) for automatically measuring and mixing the unsaturated polyester resin, curing accelerator, catalyst, etc. is installed adjacent to the impregnation device 5. A lattice-like pedestal 16 is erected at the forefront of the impregnating device 5, and behind it is a through-hole 17 through which a heat-resistant PVC pipe P1 is passed, as shown in FIG. A focusing plate 20 having a plurality of annularly bored holes 19 for converging the slow hanging 18 at equal intervals is installed upright, and an impregnating tank 21 is installed behind the heavy plate 20.

As shown in FIG. 4, the impregnation tank 21 has a substantially housing-like body made of cedar wood, has a bottom, an open top, and a glass rope 18 inside the cylinder.
A drawing die 23 is attached to the rear of the membrane wall at two tension plates 22 for applying a tensile force to the membrane wall.

Next, the automatic resin supply device 6 includes an air cylinder 24 provided above as shown in FIG.
6 and the nozzle 27 are hung down and fixed in a communicating manner, and the mixer 26
Pipe 28 for supplying thermosetting resin (polyester resin) to
A pipe 29 for supplying a catalyst, a curing agent, etc., and a pipe 3 for supplying a solvent are independently attached.

This resin supply device 6 is configured to be linked with a level adjustment device R32 using a float 31 installed at the upper part of the impregnation tank 21, and when the amount of the polyester resin composition in the impregnation tank 21 becomes low, the float 31 is Then, the operator presses the switch 33 to operate the air cylinder 24, protrudes the piston 25, and moves the nozzle 27 into the impregnating tank 2I.

When the impregnating tank 21 is filled with polyester resin, the float 31 rises upwards and pushes the switch 34 to draw in the piston 25 of the air cylinder 24, which supplies acetone from the solvent supply pipe 30 to the mixer and the glass roving 1.
8 is impregnated with an unsaturated polyester resin in an impregnating device 5 and then transferred to a winder 7.

Winder (winding machine) 7 impregnating devices 5 to 1) It is configured to rotate around a strengthened 1liIF+1 vibe P2, and a support sweat 36 protrudes in the 1111 direction from a support plate 35 at the proximal end. At the rear, bobbins 38, 38 wound with glass yarn 37 are rotatably mounted, and at the rear is a glass holding device 39 that rotates around the same heat-resistant pipe P2.
is attached.

This glass holding device 39 has holding plates 42 + 42 on which rubber plates 41 and 41 are fixed protruding inward from the substrate 40, and this rubber plate 41141 rotates around the heat-resistant pipe P2 and holds the glass yarn. 37 is rotated by pressing lightly from above.

Therefore, the glass yarn 37 is moved to the winder (winding machine) 7 and is wound at a required angle on the outer periphery of the glass roving reinforced heat-resistant pipe P2 whose core material is the heat-resistant PVC pipe PI. Because it is pressed by 41, 41,
The glass yarn 37 is also impregnated with unsaturated polyester resin. Then, the reinforced heat-resistant pipe P3, in which the glass roving 18, the unsaturated polyester resin, and the glass yarn 37 are integrally mounted on the heat-resistant PVC pipe l, is then passed through an ultraviolet curing furnace 8ay8bp8clC.

The ultraviolet curing furnace 8a has four high-pressure mercury lamps as shown in Figure 5a. 43a in the diagonal direction of the reinforced heat-resistant pipe P3.
This is installed to cure the surface layer of the unsaturated polyester resin using ultraviolet light. At this time, in this embodiment, the pipe is moved at a rate of 5 m/min, and the ultraviolet curing furnace 8a is heated at 290°C.
The mixture was transferred to the next ultraviolet curing furnace 8b at 310°C. Sixth
As shown in Figure a, Figure 6b, and Figure 6c,
In order to finish the outside of the polyester resin layer smoothly, a shaving die 44°44' is installed.The front shaving die 44 scrapes off the semi-hardened polyester resin, and the rear shaving die 44 scrapes off the convex portion of the hardened resin. As shown in FIG. 5b, two high-pressure mercury lamps 43b are installed in the furnace at left and right horizontal positions with respect to the axial direction of the pipe P3. Next, in the ultraviolet curing furnace 8c, the temperature inside the furnace is raised to 320C as shown in FIG. 5c, and two high-pressure mercury lamps 4'23c are installed in a direction perpendicular to the axis of the pipe P3.

In this way, the surface layer of the unsaturated polyester resin impregnated into the reinforced heat-resistant pipe P3 is cured within a few seconds. Next, after the surface layer is completely cured, the process moves to the far-infrared curing furnace 9, where a far-infrared heater 451 is installed as shown in FIG.
45 are elongated in the axial direction of the pipe P3, and attached to the top and bottom of the pipe P3, the inside of the polyester resin layer is heated and hardened.

After leaving the far-infrared curing furnace 9, this reinforced heat-resistant pipe P3 is passed through a crosshead mold 10 of an extruder for extruding polyurethane resin, and the outer periphery is coated with approximately 1 mm of polyurethane, and then passed through a cooling tank 11 to form a coating layer. After cooling with water and pulling out with a tensioner 12, the manufacturer and lot number are marked on the surface of the pipe with a marking device 13, and the pipe is cut into required dimensions with a cutting machine 14, and then placed in a post-hardening furnace 15 as shown in FIG. The pipe is then heated at 55°C for 12 hours to complete the heat-resistant FRP pipe.

In addition, FRP'? formed by the pultrusion force of the heat-resistant FRP pipe P of the above example The M-containing tube is made of a compacted vinyl chloride resin as shown in Fig. 9, with six layers 4 and glass yarns 18 attached in the axial direction and impregnated with a thermosetting resin such as polyester resin. It is composed of a reinforced plastic J~47 wrapped with glass yarn 37 and a covering layer 48 in which a soft thermoplastic resin is completely coated on the reinforced plastic layer 47, and the heat distortion temperature I
Jj'f - 120℃ or higher, and it is heat resistant and has a wide range of uses, and can be used for hot spring water, hot water supply pipes, etc. without suffering heat shrinkage like conventional FL (P) pipes. It is possible to provide impact-resistant FRP pipes (shown in Table 1 and Figure 1O). Therefore, according to the pultrusion molding method for FRP pipes of the present invention, the material can be molded with chlorinated vinyl chloride resin. Due to the distance between ultraviolet curing and infrared curing oven (
Even if it is cured at a temperature of 85°C or higher, the core material will not change.
Since it can be pultruded at high speed without being shaped, it significantly increases productivity, and is also inexpensive and can be used practically as a piping material for passing high-temperature fluids.

Yo Table 1 (heat shrinkage test) tree

[Brief explanation of drawings]

Figure 1 is a side view of the apparatus for forming heat-resistant FRP pipes by the method of the present invention, Figure 2 is a perspective view of the automatic feeder of the present invention, and Figure 3 is a front view of the focusing plate of the present invention. , Fig. 4 is an enlarged cross-sectional view of the impregnation tank, Fig. 5a, Fig. 5b, Fig. 5c is a cross-sectional view of the ultraviolet curing furnace of the present invention, and Fig. 6a'.
. Figures 6b and 6c are cross-sectional views of the shaved p-type installed on both sides of the ultraviolet curing furnace 8b of the present invention, Figure 7 is a cross-sectional view of an unknown far-infrared curing furnace, and Figure 8 is a cross-sectional view of an unknown far-infrared curing furnace. FIG. 9 is a cross-sectional view of a curing furnace, FIG. 9 is a perspective view of a heat-resistant FRP composite tube formed by the method of the present invention, and FIG. 10 is a graph showing the bending elastic modulus of the heat-resistant FRP IF according to the present invention. 1...Extruder, 2...Cooling tank, 3...Tension machine 4...Glass roving stand, 5 (...Impregnation device 6...Automatic feeding device, 7...Winder, 8a8b, 8'c...Ultraviolet light Hardening furnace, 9.Far infrared ray furnace, 10.φ crosshead mold, 11.Cold tank, 12.Tension machine, 13.Marking device 14. Cutting machine, 15.Post-curing furnace.Patent Applicant Kyushu Sekisui Kogyo Co., Ltd.

Claims (1)

[Claims] l) An inner core layer forming step in which a chlorinated agglomerated vinyl pipe is continuously formed from an extrusion molding trap, and a glass roving impregnated with a thermosetting resin composition is placed around the outer periphery of the inner core layer along the axial direction. Then, this upper shoe treatment is applied to the FR.
P layer molding process A coating M manufacturing process in which the surface of the FRPI is extruded and coated with thermoplastic resin and then cooled and taken off, a cutting process in which this FRP pipe is cut into lengths, and a cut FRP pipe is
Heat-resistant F characterized by consisting of a series of continuous processes including a post-curing process in which the RP pipe is cured at a required temperature for a certain period of time.
Continuous pultrusion method for RP pipe.