JPS6244432A - Molding method of frp pipe with non-slip - Google Patents

Abstract

PURPOSE:To apply a non-slip on the surface of the titled pipe, by a method wherein only a surface layer of a FRP layer is cured with ultraviolet rays, the surface of which is surrounded with a resin composite, with which a granular matter is mixed, and cure, and an inner layer part is cured further with far infrared rays. CONSTITUTION:A vinyl chloride pipe is extruded through an extrusion machine 1, which is made to cure within a cooling tank 2 and pulled out from a pulling machine 3. In succession to the above, glass roving 5 is fitted to the external circumference of the vinyl chloride pipe P1 and to run along the same so that the same is surrounded with the glass roving 5 to be impregnated to an impregnation device 6. Then after an external form has been adjusted by a shaping die 13, glass roving 17 is wound round the external circumference of a pipe P2 slantwise by shifting the shaped thing to a winder 14, which is pressed by rubber boards 21, 21 and impregnated with unsaturated polyester resin. Then after a surface layer of a pipe P3, which has been regulated to a circular state by a shaping ring device 23, has been made to cure by passing the same through ultraviolet curing furnaces 28, 29, 30, the pipe P3 is shifted to an application device 234 and a granular substance is stuck to the outside. This FRP pipe P is shifted to a far infrared curing furnace 41 and the inside of a resin layer is made to cure by heating the same. With this construction, the FRP pipe which has stabilized quality and is capable of using as a commodity immediately after production can be produced.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is utilized in the field of manufacturing FRP pipes, and in particular provides a method for forming FRP pipes that can efficiently produce FRP pipes with anti-slip surfaces. Regarding.

(Prior art and its problems) Many pultrusion methods for FRP pipes have been published, but since all FRP pipes formed using these methods have a smooth surface layer, the top surface of the FRP pipe is The surface may be slippery, which may be inconvenient depending on the application.

For example, the surface of FRP pipes used for fish culture cages used in the marine sector slips when wet with water, making it difficult for workers to work on the fish cages. Even when used for water, the top surface of the raft becomes slippery when it gets wet, making work difficult.

And it will lack safety.

(Means for Solving the Problems) The present invention was made to solve these conventional problems, and its purpose is to prevent one surface layer from slipping.
〈The purpose of this [I
As a technical means to achieve this goal, the present invention includes an inner core layer forming step in which the core material is continuously formed by extrusion molding, and a glass roving impregnated with a thermosetting resin composition in an impregnating tank. 1) Surround the outer periphery of the core material along the axial direction, then wind the glass fiber diagonally on top of it, cure it in an ultraviolet curing oven, and then pass it through a coating device to coat the granules and thermosetting resin. an FRP layer forming process in which a mixed resin composition made by mixing the above is applied and cured on the surface, and the inner surface is cured in a far infrared curing furnace; a cutting process in which the FRP pipe is cut into a certain length; and the cut FRP We adopted a forming method that consists of a series of continuous steps including a post-curing step in which the tube is hardened to a hardness close to completely hardened.

(Operation and Effect) Therefore, in the present invention, only the surface layer of the FRP layer is cured in an ultraviolet curing furnace, and the granules and thermosetting resin are mixed on the surface of the cured FRP pipe with a coating device. By curing the mixed resin composition made by surrounding heat, and then curing the inner layer of FRP in a far-infrared curing furnace, we can produce a new type of FRP pipe with a rough, non-slip surface that has never been seen before. It can be produced continuously while increasing the linear speed.

(Example) Examples of the method for molding an FRP pipe according to the present invention will be described below.

The inner core layer forming process is a process in which a thermoplastic resin tube is continuously produced by extrusion molding, then cooled by water cooling, and the inner tube is taken off at a constant speed.

Here, the thermoplastic resin pipe refers to an extruded pipe with high heat resistance such as ABS481 resin pipe, AS resin pipe, polyethylene resin pipe, and vinyl chloride resin pipe.

Next, in the FRP layer forming process, the thermosetting resin composition is supplied to the impregnation tank from the resin automatic supply device that automatically mixes and supplies the thermosetting resin with a catalyst and curing agent. a glass roving impregnated with a thermosetting resin composition that passes through the tank and surrounds the outer periphery of the inner core layer along the axial direction;
A glass roving is closely attached to the inner core layer through a shaping die, and then another glass is applied diagonally from above! The A-fiber is wound, then passed through an elastic shaping ring device to shape its outer shape, and then passed through an ultraviolet curing oven equipped with an ultraviolet lamp (high-pressure mercury lamp) to harden the surface, and then heat-cured with thermosetting resin and granules. This is a process in which a mixed resin composition mixed with is passed through a coating device to form a uniform uneven pattern on the outer surface -F, and then internally cured by far infrared rays.

Here, as the thermosetting resin, a liquid material of a polymer of an unsaturated polyester resin, an unsaturated monocarboxylic acid vinyl ester resin, an unsaturated epoxy resin, and styrene or the like is usually used.

Additives used in the present invention include benzoyl-based,
Azo type, diphenyl sulfide type J41. A mixture of styrene monomers 31% ffi M, toluene 14%, dioctyl phthalate 29%, ether and carpoxyl, 26% monosubstituted benzene compound is preferably used.

Examples of combination accelerators and curing catalysts include tertiary amines and metal catalysts such as cobalt naphthenate, and examples of polymerization catalysts include E-butyl peracetate, t-butyl pervivalate, and t-butyl perisobutyl. ester, methyl ethyl peroxide, benzoyl peroxide, and butyl perbenzoate.

In order to reduce shrinkage during curing, low-shrinkage agents include saturated polyester, polymethacrylic methyl and copolymers, polyvinyl acetate and copolymers, and the like.

In addition, the mixed resin composition of thermosetting resin and granular material, which is the main part of the present invention, includes a thermosetting resin represented by unsaturated polyester resin, gravel, crushed sand, crushed ceramics, and granular material. A mixture of 1O to 60% by weight is used to reduce the variation in particle size distribution so that the mixture with the thermosetting resin can be uniform, and the mixture is supplied to a coating device for ultraviolet curing. This mixed resin composition is uniformly applied onto the outer peripheral surface of the reinforcing pipe that comes out of the furnace and cured, passed through a shaping cylinder to shape the outer shape, and passed through a far infrared curing oven to harden the inner layer.

Next, in the cutting step, the above-mentioned composite pipe is automatically cut into a certain length.

Next, the post-curing process is to harden the cut FRP pipe to a hardness close to completely hardened, and stabilize various physical properties.
A tunnel-type post-hardening furnace with a length of 8 to 15 m is used, and the temperature inside the furnace is maintained at 50 to 65°C.
This is a process of leaving it in for about 14 hours.

The method for molding an FRP pipe according to the present invention has been described above. According to the present invention, particulate matter is dispersed on the outer surface -h of the FRP pipe, and this particulate matter is fixed to the outside of the reinforced pipe with a thermosetting resin. The surface of the FRP pipe is made to have slip resistance, and the outer shape is made into a perfect circle using a shaping cylinder, and the FRP pipe is completely cured in a post-curing furnace, so it can be manufactured immediately after production. It also has the characteristic of being able to be used as a slip market, so if various aquaculture tools and sets used in the marine field are used in products, workers' feet will not slip and cause injuries. There is no radix, and security can be sufficiently ensured.

Moreover, even on land, it can be used more suitably as a scaffolding member for construction, etc., since it provides a secure footing.

Next, an example of a specific implementation of the method of the present invention will be explained based on the drawings.
A vinyl chloride pipe of s is extruded at a speed of 6 m/min, passed through water in a cooling tank 2 while being sized and hardened into a circular shape, and then pulled out from a tensile machine 3.

Subsequently, 74 glass rovings 5 installed on the glass roving frame 4 are attached so as to surround the outer periphery of the vinyl chloride pipe P in the axial direction, and the impregnating device 6 is impregnated with the glass rovings. In addition, this impregnation device 6
An automatic raw material supply device (not shown) is installed on site to automatically measure and mix unsaturated polyester resin, curing accelerator, catalyst, etc.

” - A lattice-shaped pedestal 7 is set up at the forefront of the impregnating device 6,
Behind it, as shown in FIG. 2, there is a through hole 8 in the center through which the vinyl chloride pipe P is passed, and a large number of small holes 9 on the outer periphery of this through hole 8 that converge the glass rovings 5 at equal intervals. A focusing plate 10 with an annular hole is provided upright, and this focusing plate 1
An impregnating tank 11 is installed behind 0.

As shown in FIG. 3, the impregnation tank 11 has a bottom formed into a substantially housing-like body, and has an open L side. A shaping die 13 is attached to one side.

As shown in Fig. 4, the shaping die 13 has a length of 55 cm, a die inner diameter of 41 mm, and a drawing angle of 5 degrees. A glass roving 5 impregnated with a curable resin is inserted in a surrounding state, and the resin layer is squeezed with the inside of the die 13b to remove air contained in the resin and squeeze out excess resin, forming a nearly perfect circle. The resin and glass roving are then pressed onto a vinyl chloride pipe to shape it.

Next, after adjusting the outer shape with the shaping die 13, wine goo (
winding machine) 14.

The wine goo (winding fi) 14 is configured to rotate around the reinforced vinyl chloride pipe P2 coming out of the shaping die 13 of the impregnating device 6, and is provided to protrude laterally from the support plate 15 at the base end. A bobbin 18, 18 wound with a glass roving 17 is rotatably mounted on the support rod 16, and a glass holding device 19 that rotates around the reinforced vinyl chloride pipe P1 is mounted at the rear.

This glass holding device 2t19 has a holding plate 22°22 protruding inward from the base end 20 to which a rubber plate 21.21 is fixed, and this rubber plate 21.21 is attached to a reinforced vinyl chloride pipe P.
2 as an axis, and the glass roving 17 is rotated by being lightly pressed from the top.

Therefore, a glass roving 17 is wound around the outer periphery E of the reinforced vinyl chloride pipe P, which has been transferred to the winding machine 14, at an angle of about 60 [to the pipe axis], and a rubber plate 21. 21, the glass roving 17 is also impregnated with the unsaturated polyester resin.

Then, the outer shape of this reinforced vinyl chloride pipe P2 is perfectly adjusted.

The shaping ring device 23, as shown in FIG.
4, support plates 25, 25 are attached at an interval of approximately 100 m5, and to this support plate 25 is attached a rubber plate 27 with approximately 35 layers of shaping holes 26 previously formed.

This shaping ring device 23 has the above-mentioned reinforced vinyl chloride pipe P.
When passing through the rubber plate 27, the forming hole 26 of the rubber plate 27 is formed smaller than the outer diameter of the reinforced vinyl chloride pipe P.
The elastic force acts to remove excess resin on the reinforced vinyl chloride pipe P, smooth the unevenness of the wound glass roving 17, and adjust the outer shape of the reinforced vinyl chloride pipe PJ to a circular shape.

Next, the reinforced vinyl chloride pipe Pj adjusted into a circular shape by the shaping ring device 23 is passed through the ultraviolet curing furnaces 28, 29, and 30.

At this time, in this example, the pipe is moved at a rate of 6 m/min,
The surface layer of the unsaturated polyester resin impregnated into the reinforced vinyl chloride pipe P was passed through an ultraviolet curing oven 28 at 290°C, then transferred to an ultraviolet curing oven 29 at 310°C, and then transferred to an ultraviolet curing oven 30 at 320°C. Hardens within seconds.

1) As shown in FIG. 6(a), the ultraviolet curing furnace 28 No. 11 is constructed by installing four high-pressure mercury lamps 31 in diagonal directions of a reinforced vinyl chloride tube P to cure unsaturated polyester with ultraviolet rays. The surface layer of the resin is cured, and the ultraviolet curing furnace 29 has two high-pressure mercury lamps 32 installed at two places on the left and right as shown in FIG. 6(b). (
As shown in e), two high-pressure mercury lamps 33 are installed at the upper and lower locations.

Next, after hardening the surface layer of the reinforced vinyl chloride pipe P1, the process moves to the coating device 34, where the granules are fixed on the outer surface of the reinforced vinyl chloride pipe P3.

The coating device 34 installed at the rear of the ultraviolet curing furnace 30 is
It consists of a front cylinder 35, a 1:1 part hopper 36, and a rear forming cylinder 37. The base end 38 of the L part hopper 36 from the front cylinder 35 is cooled by cooling water, and the rear forming cylinder 37 is provided with TL heat. Heater 39 is installed. The inside of the hopper 36 is filled with a mixed resin composition 40 of a thermosetting resin and granules, and the reinforced vinyl chloride pipe P, which is inserted from the front cylinder 35, is at the base end of the hopper 36. When reaching the part 38, the mixed resin composition 40 in the hopper 36 flows down and reaches the rear shaping cylinder 37 so as to surround the outer periphery of the reinforced vinyl chloride pipe Pj. This shaping cylinder 37 has an inner diameter 0.5 to 2.0 + sm larger than the outer diameter of the reinforced vinyl chloride pipe P1, and contains a mixed resin in the gap between the reinforced vinyl chloride pipe P and the shaping cylinder inner wall 37a. The material 40 is formed so as to flow in, surround the outer periphery of the reinforced vinyl chloride pipe PJ, and harden the surface layer by the thermal energy of the electric heater 39 while moving in the direction of movement of the reinforced vinyl chloride pipe R.

Therefore, the FRP pipe P that has come out of the shaping cylinder 37 has the particulate matter M uniformly scattered on its surface, forming an uneven, rough surface. This FRP tube P is transferred to a far infrared curing furnace 41, and here a far infrared heater 42, 42 as shown in FIG.
The RP pipe P is long in the axial direction, and when the FRP pipe P is attached to a person, the inside of the unsaturated polyester resin layer is heated and hardened.

As shown in FIG. 10, the FRP pipe P thus formed has an inner core layer 43 made of vinyl chloride resin, an intermediate layer 44 attached to the glass roving 5 in the axial direction, and a glass roving 17 wound in the circumferential direction that is unsaturated. It is constructed as a three-layered composite tube in which a reinforced plastic layer is impregnated with a polyester resin and hardened, and an outer layer 45 is coated with a mixed resin composition of a thermosetting resin and granules. This composite pipe is cut into a predetermined size by a cutting machine 46.

In the post-curing furnace 47, an air flow passage 49 is taken out from the end of the ceiling wall surface of a tunnel-shaped furnace body 48 that accommodates a large number of FRP pipes P coated with a mixed resin composition and having a length of approximately 10 m. A blower 50 and a heat exchanger 5 are installed in the flow path 49-hi.
1. A heating chamber 52 is provided therein, a terminal end 53 of the air wave passage 49 from the heating chamber 52 is penetrated into the furnace from the ceiling wall at the other end of the furnace main body 48, and a hood 54 is removably attached to the terminal end 53; Insert the pipe end of the FRP pipe P loaded on the cart 56 into the tip opening 55 of the hood 54, and
The pipes are tightly tightened and hot air W at 55° C. is forced into the inside of each FRP pipe P through the hood 54 to efficiently harden the pipes while heating them.

The FRP pipe P formed as described above can be manufactured with almost the same outer diameter accuracy as that of a normal vinyl chloride pipe by passing it through a forming die, a forming ring, and a forming cylinder. By using a post-hardening furnace, it is possible to produce FRP pipes with stable quality that can be used as products immediately after production, and in addition, granules M with high sliding resistance are protruded and fixed on the surface of the FRP pipes. Therefore, it has a great sliding effect and can be used for various aquaculture rafts, fish cages, and scaffolding members for structures on land.

[Brief explanation of drawings]

Fig. 1 is a side view of an apparatus for forming FRP pipes according to the method of the present invention, Fig. 2 is a front view of a focusing plate of the present invention, Fig. 3 is an enlarged cross-sectional view of an impregnating tank, and Fig. 4 is a view of a device for forming FRP pipes of the present invention. Figure 5 is a cross-sectional view of the shaping ring device, Figure 6 is a cross-sectional view of the ultraviolet curing furnace, Figure 7 is an enlarged cross-sectional view of the coating device, and Figure 8 is far-infrared curing. FIG. 9 is a cross-sectional view of the furnace, FIG. 9 is a partially cutaway side view of the post-hardening furnace, and FIG. 10 is a perspective view of an FRP pipe formed by the method of the present invention. l: Extruder 2: Cooling tank 3: Tensile machine 5 Glass roving 6: Impregnation device 14: Winder 17: Glass roving 28, 29, 30: Ultraviolet curing furnace 34: Coating device 41: Far infrared curing furnace 46: Cutting machine 47: Post-hardening furnace P: FRP pipe Fig. 4 Fig. 2 Fig. 3 Fig. 5 Fig. 6 (a) (b) (C) Fig. 7 Fig. 8 Otsu 1 tlGIo Fig. 9 Fig. 6, -

Claims (1)

[Claims] 1) An inner core layer forming process in which the core material is continuously formed by extrusion molding, and a glass roving impregnated with a thermosetting resin composition is surrounded along the axial direction around the outer periphery of the core material in an impregnation tank. Next, glass fibers are wound diagonally on top of this and subjected to surface hardening treatment in an ultraviolet curing oven, and then passed through a coating device to coat the surface with a mixed resin composition made by mixing particulate matter and a thermosetting resin. An FRP layer forming process in which the coating is cured and the inner surface is hardened in a far-infrared curing furnace, a cutting process in which the FRP pipe is cut to a certain length, and a post-curing process in which the cut FRP pipe is hardened to a hardness close to fully cured. A method for forming non-slip FRP pipes, which consists of a series of continuous steps.