KR20100043063A - Frp reinforced vinyl chloride resin pipe joint and process for manufacturing the same - Google Patents

Frp reinforced vinyl chloride resin pipe joint and process for manufacturing the same Download PDF

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Publication number
KR20100043063A
KR20100043063A KR1020107002701A KR20107002701A KR20100043063A KR 20100043063 A KR20100043063 A KR 20100043063A KR 1020107002701 A KR1020107002701 A KR 1020107002701A KR 20107002701 A KR20107002701 A KR 20107002701A KR 20100043063 A KR20100043063 A KR 20100043063A
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KR
South Korea
Prior art keywords
frp
pipe joint
vinyl chloride
mold
reinforced
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KR1020107002701A
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Korean (ko)
Inventor
히토시 우치다
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아사히 유키자이 고교 가부시키가이샤
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Publication of KR20100043063A publication Critical patent/KR20100043063A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/14—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles in several steps
    • B29C43/146—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles in several steps for making multilayered articles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L43/00—Bends; Siphons
    • F16L43/008—Bends; Siphons made from plastic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/14—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles in several steps
    • B29C2043/141—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles in several steps for making single layer articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/0002—Condition, form or state of moulded material or of the material to be shaped monomers or prepolymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/22—Tubes or pipes, i.e. rigid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/24—Pipe joints or couplings
    • B29L2031/243—Elbows

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

An FRP reinforced PVC pipe joint that realizes not only uniform dispersion of reinforcing fiber and thermosetting resin but also satisfactory filling/reinforcement, ensuring good appearance and resistance to breakage; and a process for manufacturing the same. Use is made of a metal mold consisting of an upper die and a lower die and having a cavity thereinside, and a bulk molding compound (BMC) or sheet molding compound (SMC) for forming of an FRP layer is inserted in the lower die. In particular, a preformed vinyl chloride resin pipe joint is fixed in the lower die, and the BMC or SMC is inserted on the space superior to the vinyl chloride resin pipe joint. Thereafter, the upper and lower dies are closed, and pressurized integral molding is carried out.

Description

FRP reinforced vinyl chloride resin pipe joint and process for manufacturing the same

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to FRP (fiber-reinforced thermosetting resin) reinforced vinyl chloride resin pipe joints and a method for manufacturing the same, which are mainly used for transport piping of chemicals indicating high temperature acids and alkalis, hot spring water, and the like.

Conventionally, FRP-reinforced vinyl chloride resin pipe joints (hereinafter referred to as FRP-reinforced PVC pipe joints) used for transport piping of chemicals and hot spring water having high temperature corrosiveness are commonly referred to as the hand layup method. up, water droplet forming method) is adopted, but the hand layup method is made by hand, so the efficiency is low and requires skill, and the productivity is very bad because there are many unnecessary materials discarded after manufacture. In addition, there have been problems such as difficulty in obtaining a homogeneous molded article, poor appearance, and irregular outer diameter dimensions. As a method of solving this problem, there is a manufacturing method of a flanged pipe joint made of FRP reinforced thermoplastic resin (see Japanese Patent Laid-Open No. H05-185536). Its configuration is to produce a flanged pipe joint made of synthetic resin reinforced by an FRP layer which is a fiber-reinforced thermosetting resin, and has an inner surface shape corresponding to the outer surface shape of the pipe joint material with a flange and at the time of setting the pipe joint material. A mold capable of securing a constant resin thickness is prepared between the outer surface of the joint material, and first, a fiber-reinforced thermosetting resin is laminated on the outer surface of the pipe joint material by a hand layup method. Subsequently, the fiber-reinforced thermosetting resin is cured while setting the pipe joint material to the mold and uniformly pressurizing the whole, and after the resin is completely cured, it is removed from the mold and finished. In this method, the fiber-reinforced thermosetting resin layer (hereinafter referred to as the FRP layer) can be uniformly adhered to even parts where resin is difficult to distribute evenly, such as the flange outer surface of the pipe joint material or the bottom of the flange. It is possible to obtain a product having an excellent appearance with a well-shaped shape and free of bubbles in the interface between the FRP and the flange and in the FRP.

As another method for producing FRP-reinforced PVC pipe joints such as sockets or elbows, there is a method for producing a reinforced resin pipe joint by a filament winding method (see Japanese Patent Laid-Open No. H04-45918). . The structure is formed by molding the inner layer of the central portion having the branch deformation portion of the pipe joint with resin or reinforced resin in advance to form a molded body, and attaching a core mold for shaping the shape of the mouth part to the molded body. To remove the core after molding and hardening the pipe joint by supplying the reinforcing resin molding material by filament wiping method to the outer periphery of the core mold and the molded body.The homogeneity of the joint is promoted, the strength against internal pressure is strong, and the dimensional precision of the water port Also good.

However, the conventional method for manufacturing a flanged pipe joint made of FRP reinforced synthetic resin requires a process of first laminating a FRP (fiber-reinforced thermosetting resin) of a mold to be set on the pipe joint material by a hand layup method. However, there is a problem in that the manufacture of the pipe joint takes time and effort. In addition, the pipe joints are less effective than flange-shaped ones, and a problem occurs when the present manufacturing method is used for a socket or a cylindrical pipe joint having a bent flow path such as an elbow or a T-shape. For example, using this manufacturing method for an elbow-shaped pipe joint, a two-part mold set from both sides of an elbow, which is a pipe joint material, is prepared by stacking FRP, and the pipe joint material is pressurized with two molds sandwiched. Will be manufactured. However, since the two molds must be made by stacking the FRPs, the mold manufacturing process is doubled, and labor and time are required by the manufacture of the joint. In addition, since the strength of the weld line portion, which is the fitting face of the two molds, is lower than that of the other portions, the weld line is formed at the bent portion of the joint where stress is easily concentrated, and therefore, the weld line is damaged at the weld line. There was a problem that it was easy. The method of devising the shape of the mold to form a shape in which the weld line cannot be welded to the bent portion of the joint can be considered, but it is difficult because the shape of the mold becomes complicated.

In addition, the method of manufacturing the reinforced resin pipe joint may correspond to the shape of the elbow or T-shape, etc., because it is produced by winding the glass fiber impregnated resin in the core, the manufacturing equipment for winding There is a problem in that a new installation is expensive and at the same time takes up a lot of installation space of the manufacturing equipment. In addition, there is a problem that it takes time to manufacture one pipe joint due to the increase of the winding work process (especially the winding process), and the dimensional accuracy of the water port is good, but the outer diameter dimension is not constant. There is a problem that makes installation difficult.

In view of the above problems, the present invention is a vinyl chloride resin pipe joint reinforced with an FRP layer, in which the elbow or the appearance of the reinforcing fibers and the thermosetting resin are uniformly dispersed and sufficiently filled, and the appearance is good and not easily broken. An object of the present invention is to provide a T-shaped FRP reinforced PVC pipe joint and a method of manufacturing the same.

MEANS TO SOLVE THE PROBLEM As a result of various examinations in order to solve the problem of the said prior art, the said objective is achieved by using bulk molding compound (henceforth BMC) or sheet molding compound (henceforth SMC) for an FRP layer. To discover and complete the present invention.

That is, the present invention is a method for producing a FRP-reinforced vinyl chloride-based resin pipe joint reinforced with a fiber FRP layer using a mold having an upper mold and a lower mold having a cavity formed therein, Filling the lower mold with the BMC or SMC for forming the FRP layer, fixing the pre-formed vinyl chloride resin pipe joint to the lower mold, and the BMC or SMC on the upper portion of the vinyl chloride resin pipe joint The first feature is that after the filling, the upper mold is closed to press integral molding.

In addition, a slide core driven by a hydraulic cylinder is installed in the mold, and the slide core is fitted into and fixed to respective openings of the vinyl chloride resin pipe joint.

An abutment surface is provided on the slide core to abut the end face of the opening of the FRP reinforced vinyl chloride-based pipe joint, and the abutment surface protrudes 0.3 to 0.8 mm from the position of the end face of the opening of the FRP reinforced vinyl chloride-based pipe joint. It is characterized by the third feature.

The upper mold and the lower mold are closed in stages, and once the upper mold and the lower mold are completely opened, the opening is stopped from 100% to 15-25% of the opening, and then the opening is 3-8. The fourth feature is that the apparatus is stopped once in the state of closing up to%, and the opening is also in the state of completely closing down to 0%.

A fifth feature is that at least a part of the contact surface of the upper mold and / or the lower mold of the mold is formed at an acute angle with the circumference of the cavity as a tip.

Furthermore, the sixth feature is that the FRP-reinforced vinyl chloride-based resin pipe joints are manufactured by the method for producing the FRP-reinforced vinyl chloride-based resin pipe joints.

This invention has the above structures, and the following outstanding effects can be acquired by using this.

(1) For FRP reinforcing PVC pipe joints, FRP layers are formed easily and without increasing the manufacturing process for cylindrical vinyl chloride resin joints (hereinafter referred to as PVC pipe joints) such as elbow or T-shape. It can be made with less waste without waste of material.

(2) Even if the structure of the pipe joint is complicated, the corner reinforcement fibers can be uniformly installed over the entire circumference, and both the physical properties and the appearance are stable, and the FRP reinforcement PVC pipe joints having a constant outer diameter dimension can be obtained.

(3) Since the FRP layer of uniform thickness can be formed and it has the strength of the weld line part, the joint which does not break easily can be obtained maintaining high water pressure strength.

(4) Even when the dimensions of the fixed PVC pipe joint are shifted, by press-molding integrally by inserting the heated slide core, it is possible to correct the dimensions such as the taper of the mouth and the angle shift of the joint at the time of molding, so that the dimensional accuracy is improved. Good FRP reinforcement PVC pipe joints can be obtained.

(5) Even if a burr is generated, the burr can be cut in the mold to take out the FRP reinforced PVC pipe joint.

(6) Since the air can be reliably taken out by performing the closing of the upper mold and the lower mold in stages, it is possible to prevent air from remaining in the mold and generation of voids or molding stains.

Included in the context of the present invention.

1: is a longitudinal cross-sectional view which shows the metal mold | die when BMC is filled in a lower mold | type.
FIG. 2 is a longitudinal cross-sectional view showing a mold when the PVC pipe joint is installed from FIG. 1 and BMC is filled in the upper part of the PVC pipe joint. FIG.
FIG. 3 is a longitudinal cross-sectional view showing a mold when the upper mold is closed from FIG. 2 and press-molded.
4 is a longitudinal sectional view showing a FRP reinforced PVC pipe joint.

EMBODIMENT OF THE INVENTION Hereinafter, although embodiment of this invention is described with reference to drawings, it cannot be overemphasized that this invention is not limited to this embodiment. 1: is a longitudinal cross-sectional view which shows the metal mold | die when BMC is filled in a lower mold | type. FIG. 2 is a longitudinal cross-sectional view showing a mold when the PVC pipe joint is installed from FIG. 1 and BMC is filled in the upper part of the PVC pipe joint. FIG. FIG. 3 is a longitudinal cross-sectional view showing a mold when the upper mold is closed from FIG. 2 and press-molded. 4 is a longitudinal sectional view showing a FRP reinforced PVC pipe joint.

In the drawing, reference numeral 1 is a lower mold of a mold, and a cavity 3 of an FRP reinforced PVC elbow 2 is formed therein. On the two sides of the lower mold 1 (both openings of the PVC elbow 8), the hydraulic cylinders 4 are respectively provided on the substantially same axis as the openings, and the cylinders 4 of the PVC elbow 8 described later Slide cores 5 fitted in the openings are provided respectively. Further, the lower part of the lower mold 1 is provided with a protruding pin (not shown) for taking out the FRP reinforced PVC elbow 2.

By inserting the slide core into each of the openings of the PVC elbow 8, the work of fixing the PVC elbow 8 to the mold is simplified, while the PVC elbow 8 is fixed so as not to move, and the PVC elbow 8 during molding. Can be prevented from being deformed. Here, the outer circumferential dimension of the slide core 5 is formed with the inner circumferential dimension of the PVC elbow 8 and a margin of 0.1 to 0.3 mm. It is possible to calibrate to the dimension set by the core 5. At this time, even when the fixed PVC elbow 8 is out of dimensions due to the internal stress during injection molding, the heated slide cores are inserted into the openings of the PVC elbow 8 and press-molded to form integral parts of the water tools during molding. Dimensions, such as a taper and a shift of a seam angle, can be corrected to an accurate dimension, and the FRP reinforced PVC elbow 2 with a good dimensional precision can be obtained. In addition, the slide core 5 is formed with an abutting surface 12 on which the end surface of the opening of the FRP reinforced PVC elbow 2 composed of the PVC elbow 8 and the FRP layer 10 abuts, and the slide core 5 is formed of PVC. When fitted to the elbow 8, the contact surface 12 is projected to be about 0.3 ~ 1.0mm than the position of the cross section of the PVC elbow (8). Thereby, the contact surface 12 presses the opening end surface of the FRP reinforced PVC elbow 2 which consists of the PVC elbow 8 and the FRP layer 10 at the time of press integrated molding, and the cross section is sealed, and the PVC elbow is sealed. The BMC 9 is prevented from leaking into the cross section or the inner circumference of (8). Here, the protrusion amount of the contact surface 12 should be 0.3 mm or more in order to press the cross section of the PVC elbow 8, so that the pressing force on the cross section of the PVC elbow 8 is increased so that the load is not applied to the PVC elbow 8. It should be less than 1.0mm.

In addition, the working pressure of the cylinder 4 is preferably equal to or higher than the internal pressure applied to the cavity 3 at the time of press integral molding. Moreover, when the upper mold 6 and the lower mold 1 are closed, the upper mold 6 and / or the lower mold 1 is provided with a stopper part (not shown) that can be fitted to the slide core 5 or the cylinder 4. It is desirable to. For example, the upper mold | type 6 is provided with the convex stopper part, and the slide core 5 is provided with the concave-shaped engaging part which can be engaged with the stopper part, and the upper mold | type 6 and the lower mold | type 1 are abolished. In this case, the stopper portion and the engaging portion are formed to be engaged to prevent the slide core 5 from moving due to the internal pressure applied to the cavity 3 during the press integral molding, and the FRP reinforced PVC elbow 2 having good dimensional accuracy is provided. You can get it. In addition, when the stopper portion is provided, even if the working pressure of the cylinder is lower than the internal pressure in the cavity 3 at the time of the pressure integral molding, it is preferable because good molding is possible.

Reference numeral 6 is an upper mold of the mold, and the cavity 3 of the FRP reinforced PVC elbow 2 is formed therein. The peripheral part 7 of the cavity 3 is formed so that it may become an acute angle with the peripheral part 7 of the cavity 3 as the front end among the abutting surfaces of the upper mold | type 6 which contact | connects the lower mold 1. The angle (theta) of the circumferential part 7 at this time is provided so that it may become 45 degrees with respect to the contact surface with the lower die 1. As shown in FIG.

Numeral 8 is a PVC elbow which is installed in a mold and is a pre-injection molded PVC pipe joint. On the other hand, in the present embodiment, the PVC pipe is an elbow, and elbows, bends, T-shapes, sockets are particularly preferred, and flanges, caps and the like may be used.

Reference numeral 9 denotes a BMC sandwiched between the lower mold 1 and the upper mold 6 to form the FRP layer 10 in the FRP reinforced PVC elbow 2 when the PVC elbow 8 is FRP reinforced.

The material of the preformed PVC pipe joint used in the present invention is not particularly limited, but generally used hard vinyl chloride resin, chlorinated vinyl chloride resin, ethylene-vinyl chloride copolymer resin or vinyl acetate-vinyl chloride copolymer resin, etc. It is mentioned as a preferable thing.

BMC, also called a premix, is a molding material made of clay by adding and kneading a filler and the like, in addition to resins and reinforcing fibers. On the other hand, SMC refers to a sheet-like molding material impregnated with a resin in the reinforcing fiber mat. All of them are molded materials which are filled with a suitable amount in a mold, heated and pressurized, and have a characteristic that the structural constraints of the mold are not so high because the resin is not used as a liquid. In particular, BMC is preferable because it is easy to distribute the material required for one-time molding, and it can be molded with less waste without wasting material, and it is easy to mold the mold to fit the cavity during molding.

The thermosetting resin used for the BMC or SMC of the present invention may be an unsaturated polyester resin, a vinyl ester resin, an epoxy resin or a phenol resin, and among these, an unsaturated polyester resin may be mentioned as preferred in various aspects. Unsaturated polyester resin is bisphenol-based unsaturated polyester resin can form a homogeneous FRP layer with respect to the joint having a curved flow path such as elbow by curing for some time when forming the FRP layer on the PVC joint Since the bisphenol adduct was used for at least one part as a polyhydric alcohol component of an unsaturated polyester resin, the unsaturated polyester resin obtained by reacting the polyhydric alcohol component containing bisphenol and a polybasic acid component is melt | dissolved in a styrene monomer, , A liquid resin to which a polymerization inhibitor, a polymerization catalyst and the like are added is preferable. In addition, the unsaturated polyester resin is improved in alkali resistance of FRP-reinforced PVC pipe joints by using a matrix liquid resin composed of a liquid resin containing a high molecular weight bisphenol-based unsaturated polyester resin and a liquid resin containing a low molecular weight bisphenol-based unsaturated polyester resin. desirable. In addition, BMC or SMC is comprised by adding a hardening | curing agent, a thickener, a filler, a coloring agent, etc. as needed other than the above-mentioned reinforcing fiber or thermosetting resin.

In addition, it is preferable that the thermosetting resin used for BMC or SMC mix | blends 50-150 weight part of reinforcement fiber with respect to 100 weight part of unsaturated polyester resins. It should be 50 parts by weight or more in order to obtain the strength of the resin composition for reinforcement, within the range of easy kneading during preparation of the composition, and 150 parts by weight or less so that the appearance of the fiber does not deteriorate on the surface after molding. As the reinforcing fibers used in the BMC or SMC forming the FRP layer, glass fibers are particularly preferred, and polyvinyl alcohol fibers, aromatic polyamide fibers or carbon fibers are preferred. In addition, the shape is chopped strand (chopped strand) to 3-25mm is mentioned as a preferable thing.

Moreover, it is preferable to mix | blend 0.2-10 weight part of inorganic fillers with respect to 100 weight part of unsaturated polyester resins. It should be 0.2 parts by weight or more to improve the thermal conductivity of the composition, and 10 parts by weight or less in order to improve the storage stability of the composition and not impair the impact resistance. In addition, the inorganic filler in the present invention includes calcium carbonate, mica, barium sulfate, calcium sulfate, clay, pearlite, Shiras balloon, diatomaceous earth, calcined alumina, calcium silicate, talc, etc. have. Among these, silica and calcium carbonate are especially preferable.

Moreover, it is preferable to mix | blend 0.5-4 weight part of hardening | curing agents with respect to 100 weight part of unsaturated polyester resins. The resin composition should be at least 0.5 parts by weight in order to cure under desirable molding conditions, and at most 4 parts by weight so that the resin is not cured too quickly to make molding difficult. Moreover, as a hardening | curing agent, it is preferable for low temperature, and it is bis (4-tert- butyl cyclohexyl) peroxydicarbonate (product name: Percardox 16), tert- amyl peroxy 2-ethylhexanoate (product name: Trigonox), benzoyl Peroxide (product name: cardox) etc. are mentioned as a preferable thing.

Moreover, you may comprise by adding a mold release agent, a thickener, a coloring agent, a hardening accelerator, etc. as needed with respect to 100 weight part of unsaturated polyester resins. What is necessary is just to mix | blend each additive with the grade which hardening of an additive can exhibit, and it is preferable to mix | blend 0-2 weight part of mold release agents, 0-5 weight part of thickeners, 0-15 weight part of coloring agents, and 0-1 weight part of hardening accelerators. Do.

In addition, for the production method of BMC, a thermosetting resin, a releasing agent, a coloring agent, a curing agent, and the like are mixed in advance, and the filler is kneaded with a kneader, followed by mixing the thickener, followed by uniform dispersion of the reinforcing fibers. The mixture is extracted from the kneader to a shape of a predetermined size, and aged to obtain BMC. In addition, for the manufacturing method of SMC, a compound obtained by mixing a thickener in a mixture of a thermosetting resin, a filler, a releasing agent, a coloring agent, a curing agent, and the like uniformly is dispersed on a polyethylene film, and pressed and impregnated into a predetermined reinforcing fiber to form a sheet. After making it into a roll, it rolls and ripens at room temperature or warm, and it is set as SMC.

Here, the temperature of the metal mold which consists of the upper mold | type 6 and the lower mold | type 1 should be set to 40-120 degreeC, and 60-100 degreeC is more preferable. In order to increase the molding efficiency without increasing the curing time of the BMC 9, the mold temperature is preferably 40 ° C. or higher, and the mold temperature is 120 ° C. or lower in order to prevent deformation such as expansion of the PVC elbow 8. . Thereby, hardening temperature of BMC9 is 40-120 degreeC, More preferably, it is 60-100 degreeC. In order to improve productivity without increasing the molding time, the curing temperature is preferably 40 ° C. or higher, and the curing temperature is 120 ° C. or lower in order to suppress deterioration of the material so that the BMC 9 can be used for a long time. Herein, the curing temperature is a temperature at which the molding time required for obtaining a plate-shaped molded article of 100 × 100 × 10 mm using the BMC 9 or SMC is 5 minutes to 20 minutes with the mold at that temperature. For example, BMC (9) of 80 degreeC of hardening temperature means the BMC (9) whose molding time required for obtaining a molded article with a 80 degreeC metal mold | die is 5-20 minutes.

As a result, the curing agent used for the BMC 9 should be reacted at a lower temperature than the curing agent generally used. For example, as a hardening | curing agent of BMC (9) whose hardening temperature using unsaturated polyester resin is 70 degreeC, the peroxide whose half life temperature is about 40-50 degreeC for 10 hours is used preferably. In this case, when manufacturing the BMC 9, the temperature of the raw material mixture should be maintained at a low temperature at which the mixture does not cure, and the aging must be carried out at low temperature as well. For example, as a manufacturing method of BMC (9) whose curing temperature using an unsaturated polyester resin is 80 degreeC, it pre-mixes unsaturated polyester resin, a filler, a mold release agent, a thickener, a hardening | curing agent, etc. at 20 degreeC, and reinforces fiber and This premix is mixed with a Henschel mixer to obtain a mixture, and then a method of obtaining BMC 9 is obtained by sealing the mixture and aging at 20 ° C. for 1 day.

Moreover, in the metal mold | die of this invention, it is preferable that at least one part of the contact surface of an upper mold | type and / or a lower mold | type is formed at an acute angle with the circumferential part 7 of a cavity as a tip. It is preferable to set the angle (theta) of the circumference 7 at 30-60 degrees, and 30-45 degrees are more preferable. 30 degrees or more are preferable in order to obtain the tip strength of the circumferential part 7 which made acute angle, and 60 degrees or less are good in order to cut | disconnect the BMC protruded from the cavity 3 with a metal mold | die.

Next, the manufacturing method of a FRP reinforced PVC pipe joint is demonstrated.

First, the BMC 9 is filled into the lower mold 1 heated to 80 ° C. (state of FIG. 1). Subsequently, a PVC elbow 8 having a primer applied to the outer periphery is installed on the filled BMC 9 of the lower mold 1, and the slide core 5 is fitted into each opening of the PVC elbow 8. Fix the PVC elbow (8). Subsequently, the BMC 9 is filled in the upper part of the PVC elbow 8 (state of FIG. 2). At this time, the filling amount of the BMC (9) is filled with 25 to 40% of the cavity volume in the lower mold 1, 60 to 80% of the cavity volume in the upper portion of the PVC elbow (8). In addition, the BMC 9 filled in the upper part of the PVC elbow 8 fills the curved portion (a position of the cavity 3 corresponding to the curved portion 11 in FIG. 4) a little more.

Subsequently, the upper mold | type 6 and the lower mold | type 1 heated at 80 degreeC are phased out. When the upper mold 6 and the lower mold 1 are fully opened when the BMC 9 is filled, the opening degree is 100%. As the first step, the opening is stopped once in a state where the opening degree is closed to 15 to 25%. Hold for a minute. At this time, the convex part 13 of the upper mold | type 6 and the recessed part 14 of the lower mold | type 1 become the state which meshed to about half, and the BMC9 heats in a metal mold | die, and air in a metal mold | die comes out. . As a second step, once the opening is closed to 3 to 8%, it is once stopped and held for about 1 minute. At this time, the upper mold 6 and the lower mold 1 are in a state where there is a slight gap, and the BMC 9 is deformed so as to spread evenly in the cavity 3 and air is released. As a third step, press integral molding is performed in the fully closed state where the opening is also 0%. After press-molding and retaining for a certain time, the FRP layer 10 is installed on the PVC elbow 8 to form the FRP-reinforced PVC elbow 2 (state of FIG. 3), and the upper mold 6 is opened to slide the core 5. After pulling out, push the FRP reinforced PVC elbow (2) into the ejector pin.

By the above manufacturing method, by removing the upper mold 6 and the lower mold 1 in a stepwise manner, air can be reliably evacuated, and air can be prevented from remaining in the mold and generation of voids or molding stains. It can heat efficiently. In addition, in the present embodiment, the lower mold 1 was filled with 25-40% of the cavity volume and 60-80% of the cavity volume at the top of the PVC elbow 8, but the BMC 9 was filled with the PVC elbow. In the upper part of the upper part (8), when the same amount of BMC (9) is filled in the upper part of the lower mold | type 1 and the PVC elbow (8), the BMC (9) of the lower mold | type 1 side at the time of press integrated molding is carried out. Rather than pushing upwards to fill the cavity 3, the amount of BMC 9 to be filled in the upper part of the PVC elbow 8 is increased, so that the BMC 9 on the PVC elbow 8 side at the time of pressure integral molding. It is preferable to push down) to fill the cavity 3 so that the BMC 9 can be more efficiently and evenly distributed into the cavity 3. When the pipe joint has a bent portion of the flow path such as elbow, bend, T-shape or the like, if the BMC 9 is filled with a little more in the bent portion of the cavity 3, the fluid pressure at the time of use of the FRP reinforced PVC elbow 2 is increased. This is preferable because a strong strength is obtained at the bent portion 11 of the PVC elbow 8 where stress is concentrated when it is caught, and is not easily broken.

Here, it is preferable that the sum total of the filling amount of BMC9 exists in the range of 105-115% with respect to a cavity volume. The reason for exceeding 100% is that the BMC 9 is pressed more strongly in the mold by filling a little more than the cavity volume, so that the dense FRP layer 10 is uniformly formed over all the circumference of the seam. . In addition, although the extra BMC 9 may leak out from a metal mold | die as a bur, the burr leaked out of a metal mold | die is acutely angular because the front-end | tip of the periphery part 7 of the cavity of a metal mold contact surface is provided at an acute angle. The burr can be cut by the tip of 7), and the burr generated can extract the FRP reinforcement PVC elbow (2) in the state of being cut in the mold. Thereby, the effort of removing burrs can be saved, and molding can be performed in a shorter time. In addition, according to the production method of the present invention, among the methods for producing FRP-reinforced PVC elbows by molding using BMC, materials necessary for one-time molding can be easily and accurately distributed. For this reason, the FRP reinforcement PVC elbow which is stable in outer diameter dimension can be shape | molded, and since there is no waste of material at the time of shaping | molding, waste can be molded with little waste.

The FRP reinforcement PVC elbow 2 obtained by the above-described manufacturing method has a FRP layer having a uniform thickness, the same strength as that of the other parts is obtained in the weld line portion, and the bent portion 11 which is easy to concentrate stress is formed. Since it is not easily broken, it has high water pressure strength. In addition, by press-molding by inserting the heated slide core, it is possible to correct dimensions such as taper of water polo and angular misalignment of pipe joints, thereby obtaining FRP-reinforced PVC elbows with high dimensional accuracy. Moreover, by press-integral molding, it has a good appearance and can obtain an accurate outer diameter dimension. For this reason, it is preferable to be able to install a support easily at the time of piping construction.

In the manufacturing method of the present invention, a primer layer (not shown) may be formed between the PVC elbow 8 and the FRP layer 10, and the primer is applied to the outer circumference of the PVC elbow 8 in advance. The FRP layer 10 may be formed. By forming a primer layer (not shown), the PVC elbow 8 and the FRP layer 10 are firmly bonded to prevent the occurrence of a gap between the PVC elbow 8 and the FRP layer 10 to ensure reinforcement. can do. In addition, when water pressure is applied to the FRP reinforced PVC elbow 2, when a crack occurs in the FRP layer 10, the crack can be prevented from propagating to the PVC elbow 8, FRP reinforced PVC elbow (2) The water resistance strength of the elbow 2 can be improved.

Next, the FRP reinforced PVC elbow of this invention was shape | molded, and the performance was evaluated by the test method shown below.

(1) Hydraulic strength test

After filling the water in the closed state of both openings of the FRP reinforced PVC elbow, increase the liquid temperature and hold it for 2 hours while the internal liquid temperature reaches 90 ℃, and then gradually increase the water pressure to damage the FRP reinforced PVC elbow. The water pressure at the time of measurement was measured.

BMC used for the test was prepared by the following method.

100 parts by weight of bisphenol-based unsaturated polyester resin, 95 parts by weight of glass chopped strand cut into 13 mm as reinforcing fiber, 1 part by weight of silica powder as inorganic filler, 2.5 parts by weight of curing agent, and 8 parts by weight of coloring agent. To 2 parts by weight of zinc stearate and 2 parts by weight of magnesium oxide, first, an unsaturated polyester resin, a colorant and a curing agent are added and stirred and mixed for about 1 minute, and then the remaining raw materials except for the cut glass fibers are added to Stir and mix for about 3 minutes. Next, chopped glass fibers are added and stirred and mixed for about 10 minutes. Thus, the obtained mixture was aged to obtain BMC.

<Example 1>

The FRP layer 10 was formed in the order of this example in the PVC elbow 8 having a diameter of about 10 mm to obtain an FRP reinforced PVC elbow 2. The workability during molding and the appearance and water pressure strength of FRP reinforced PVC elbows after molding were evaluated. The test results are shown in Table 1.

Comparative Example 1

Using an unsaturated polyester resin as a thermosetting resin, a chopped glass fiber mat and a glass roving cloth as a reinforcing fiber, it was laminated on a PVC elbow having a diameter of about 100 mm by a hand layup method to obtain a FRP reinforced PVC elbow. The thickness of the FRP layer was set in the same manner as in Example 1. The workability at the time of molding and the appearance and the water pressure strength of the FRP-reinforced PVC elbow 2 after molding were evaluated. The test results are shown in Table 1.

Example 1 Comparative Example 1 Workability Good Bad Exterior Good Bad Hydraulic pressure strength 7.0 MPa 6.5 MPa

From Table 1, in terms of workability, Example 1 is easy to work, there is no particularly difficult work, and it is not cumbersome, and workability is good, whereas in Comparative Example 1, since the FRP layer is provided on the entire PVC elbow by hand layup, work is not performed. Difficult and cumbersome, bad workability. In addition, in Comparative Example 1, since a large amount of waste is generated during molding, a lot of material is waste. In Example 1, there is little waste and little waste other than a little burr. In addition, in appearance, Example 1 has a uniform thickness of the FRP layer, the outer diameter is stable, the surface is smooth and glossy, and the appearance is good, whereas in Comparative Example 1, the thickness of the FRP layer is irregular, The outer diameter was also unstable, and the surface was so rough that the appearance was poor. In terms of the hydrostatic strength, the strength itself has the necessary strength to be used as a seam and there is no big difference. However, Example 1 having a uniform thickness and a high density of the FRP layer has a slightly higher pressure resistance than that of Comparative Example 1. Can be used for higher water pressure.

Included in the context of the present invention.

Claims (6)

As a method of manufacturing a FRP-reinforced vinyl chloride-based resin pipe joint reinforced with a fiber-reinforced thermosetting resin (FRP) layer using a mold having an upper mold and a lower mold having a cavity formed therein,
Filling the lower mold with a bulk molding compound (BMC) or a sheet molding compound (SMC) for forming the FRP layer,
Fixing the pipe joint made of vinyl chloride-based resin preformed in the lower mold,
After filling the BMC or the SMC on top of the vinyl chloride resin pipe joint,
A method for producing a FRP-reinforced vinyl chloride-based resin pipe joint, characterized in that the upper mold and the lower mold are closed and press-molded. The method of claim 1,
A slide core driven by a hydraulic cylinder is installed in the mold, and the slide core is inserted into and fixed to each opening of the vinyl chloride resin pipe joint, thereby manufacturing an FRP-reinforced vinyl chloride resin pipe fitting. Way. The method of claim 2,
An abutment surface is provided on the slide core to abut the end face of the opening of the FRP reinforced vinyl chloride-based pipe joint, and the abutment surface protrudes 0.3 to 0.8 mm from the position of the end face of the opening of the FRP reinforced vinyl chloride-based pipe joint. A method for producing a pipe joint made of FRP-reinforced vinyl chloride resin, characterized in that it is made. The method according to any one of claims 1 to 3,
The abolition of the upper mold and the lower mold is made in stages,
From the opening degree 100% which is the full opening of the said upper mold | type and the said lower mold | type, it stops once in the state which closed to 15-25% of opening degree, and then stops once in the state which closed to 3-8% of opening degree, and then opens A method for producing a FRP-reinforced vinyl chloride-based resin pipe joint, characterized in that the totally closed state is 0%. The method according to any one of claims 1 to 4,
A method for producing a FRP-reinforced vinyl chloride-based resin pipe joint, characterized in that at least a part of the contact surface of the upper mold and / or the lower mold of the mold is formed at an acute angle with the circumference of the cavity as the tip. A FRP-reinforced vinyl chloride-based resin tube joint manufactured by the method for producing a FRP-reinforced vinyl chloride-based resin tube joint according to any one of claims 1 to 5.
KR1020107002701A 2007-08-09 2008-07-25 Frp reinforced vinyl chloride resin pipe joint and process for manufacturing the same KR20100043063A (en)

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CN102501384A (en) * 2011-11-03 2012-06-20 厦门建霖工业有限公司 One-time moulding method and moulding device for hose with joint
CN103162053A (en) * 2011-12-08 2013-06-19 上海启鹏工程材料科技有限公司 Pipe connector and manufacture method thereof
US20130191966A1 (en) * 2012-01-26 2013-08-01 Richard A. Rivkin Bi-colored insulating sleeve
CN105415709B (en) * 2015-12-16 2018-08-31 上海晋飞碳纤科技股份有限公司 3D nylon wind pipes are molded the moulding process of fire-retardant camber beam and make mold
CN106369238A (en) * 2016-10-08 2017-02-01 威海纳川管材有限公司 Non-metal pipeline joint
JP7019988B2 (en) * 2017-07-27 2022-02-16 株式会社オンダ製作所 Resin elbow fitting
CN109723924B (en) * 2018-10-16 2022-03-15 上海船舶工艺研究所(中国船舶工业集团公司第十一研究所) Carbon fiber elbow for ship and manufacturing method thereof
JP2022189011A (en) * 2021-06-10 2022-12-22 株式会社神戸製鋼所 Mold, apparatus and method for manufacturing metal-resin composite

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JPS537763A (en) * 1976-07-09 1978-01-24 Nippon Glass Fiber Co Ltd Method of producing tube joint formed with synthetic resin inside layer
JPS62275719A (en) * 1986-05-26 1987-11-30 Arai Pump Mfg Co Ltd Manufacture of resin reed valve
JPH0622913B2 (en) * 1989-07-07 1994-03-30 旭有機材工業株式会社 FRP reinforced vinyl chloride resin pipe joint and method for producing the same
JPH1134088A (en) * 1997-07-15 1999-02-09 Kawasaki Steel Corp Manufacture of rubber roll
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