JPS608046A - Method and apparatus for covering and hardening fiber- reinforced synthetic resin bar - Google Patents

Abstract

PURPOSE:To strongly and closely bond both resins having no chemical affinities to each other by a method in which a reinforced core material composed of reinforcing fiber bundles impregnated with uncured thermosetting resin is covered with a molten thermoplastic resin and hardened, and they are treated under a specific condition in a hardening tank. CONSTITUTION:A reinforced core material composed of reinforcing fiber bundles impregnated with uncured thermosetting resin is covered with a molten thermoplastic resin and hardened by cooling. The bar material 11 so obtained is heat- treated in a hardening tank 1 where the vapor at the temperature near the melting point of the thermoplastic resin covering the bar material 11 is supplied under a pressure below the saturated vapor pressure to harden the thermosetting resin of the reinforced core. At the same time, the thermoplastic resin is closely adhered to the core material.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention cures the thermosetting resin by heat-treating a rod-shaped object in which a reinforcing core made by impregnating a reinforcing fiber bundle with an uncured thermosetting resin is coated with a thermoplastic resin. The present invention also relates to a method and apparatus for bringing a thermoplastic resin coating into close contact with the thermoplastic resin.

The applicant of the present application has previously impregnated a reinforcing fiber bundle with an uncured thermosetting resin to cover the outer periphery of the core by discharging a molten thermoplastic resin, and immediately introducing the molten thermoplastic resin into a water tank. Only the thermoplastic resin is cooled and solidified to form a continuous rod with the thermosetting resin inside unhardened.Then, this continuous rod is passed through a hot water bath to harden the thermosetting resin and achieve the desired tensile strength. The present invention provides a method for molding a continuous rod-shaped article made of fiber-reinforced synthetic resin having a modulus of elasticity of .

The above-mentioned method of heat-treating a continuous rod by passing it through a hot water bath provides a constant heating temperature and is extremely economical, but the thermosetting resin in the core and the thermoplastic resin in the outer periphery have a chemical affinity. When it is made of a resin that does not have the above-mentioned properties, the adhesion between the two is not necessarily good, and the heat treatment takes a relatively long time, which limits productivity.

The present invention has been made in view of the above-mentioned problems, and its purpose is to combine the thermosetting resin in the core and the thermoplastic resin in the outer periphery.
Even if the two do not have chemical affinity, it is possible to achieve extremely strong adhesion, and productivity can be improved by shortening the heat treatment time for this adhesion and curing the thermosetting resin. An object of the present invention is to provide a coating curing method and an apparatus for a fiber-reinforced synthetic resin rod.

That is, according to the method for coating and curing rods made of IB navy blue reinforced synthetic resin according to the present invention, a reinforcing core portion formed by impregnating 88 reinforcing bundles with an uncured thermosetting resin is coated with a molten thermoplastic resin. Immediately thereafter, a rod-shaped object obtained by cooling and solidifying the thermoplastic resin is introduced into a curing tank, and in the curing chamber, steam at a temperature near the melting point of the coated thermoplastic resin is applied to the rod-shaped object under pressure to strengthen the rod-shaped object. The thermosetting resin of the core is cured, and the thermoplastic resin coating is brought into close contact with the reinforcing core.

In the apparatus of the present invention for carrying out the above method, a steam supply port is provided on the outer periphery of one end of the curing tank elongated in the horizontal direction, and a condensed water outlet is provided on the outer periphery of the narrow end, and the front and rear ends of the curing tank are Water tanks each having an inlet and an outlet for water are disposed closely together, and the curing tank and the water tank are coated with a reinforcing core made of a reinforcing fiber bundle impregnated with an uncured thermosetting resin and covered with a thermoplastic resin. It is formed by forming a through hole through which a rod-shaped object can pass.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

First, the illustrated fiber-reinforced synthetic resin rod 3- The coating curing device for shaped objects will be explained.

In the figure, reference numeral 1 indicates a curing tank in the form of a pipe elongated in the front-rear direction.
A supply port 2 for pressurized steam (as described above) is provided, and a condensed water discharge port 3 is provided at the narrow end side thereof. Water tanks 4a and 4++ are arranged at both front and rear ends of the curing tank 1, and water supply ports 5a and 5b are formed at the lower side of each tank.
Further, drain ports 6a and 6b are formed in the upper side portion thereof.

The hardening M11 and the water tanks 4a, 4b are partitioned by vertical sheet-like silicone rubber gaskets 7a, 7b, and the silicone rubber gaskets 7a.

Through holes 8a and 8b are formed in the center of 7b, respectively. Further, vertical sheet-like rubber gaskets 9a, 9b are attached to both the front and rear ends of the rainwater tanks 4a, 4b.
Through holes 10a and 10b are formed in the centers of these rubber gaskets 9a and 9b, respectively. Through holes 8a and 3b formed in these silicone rubber gaskets 7a and 7b
and through holes 10a formed in the rubber gaskets 9a, 9b.
, 10b are formed along the same horizontal line.

The above-mentioned device hardens a rod-shaped object 11 by coating a reinforcing core made by impregnating a reinforcing fiber bundle with an uncured thermosetting resin, and then immediately cooling and solidifying the thermoplastic resin. This is for heat treatment in tank 1. This rod-shaped object 11 enters the water tank 4a through the through hole 10a of the front rubber gasket 9a, and then enters the water tank 4a through the silicone rubber gasket 7a.
It is designed to be introduced into the curing tank 1 through the through hole 8a. Moreover, a rod-shaped object 11 heat-treated in the curing tank 1
enters the water tank 4b through the through hole 8b of the rear silicone rubber gasket 7b, and then enters the through hole 10b of the rubber gasket 9b.
The diameter of the through hole 8b of this silicone rubber gasket 7b is made slightly larger than the diameter of the rod-shaped object 11, and the heat-treated rod-like object 11 is inserted into the through hole 8b for the reason described later. It is important to avoid contact with other people.

The method of the present invention for heat-treating the lliIffl reinforced synthetic resin rod 11 using the above-mentioned apparatus will be described.

First, steam at a temperature of 100°C or higher is supplied into the curing tank 1 from the supply port 2 at its saturated vapor pressure, and the water tanks 4 on both sides of the curing tank 1 are
-a, /1. Cooling water is supplied to b from the water supply ports 5a and 5b, and overflow water is drained from the discharge ports 6a and 5b. In this state L12, the IIM reinforced synthetic resin rod 11 is introduced into the curing tank 1 through the through holes 10a and 8a of the front water tank 4a. As described above, this rod-shaped object 11 is made by coating a reinforcing core made by impregnating a reinforcing fiber bundle with an uncured thermosetting resin with a molten thermoplastic resin, and then immediately cooling and solidifying the thermoplastic resin. It is what it is. The temperature of the steam supplied into this curing tank is around the melting point of the thermoplastic resin coating the rod-shaped object 11, for example, in the case of nylon 12, the temperature is 140~
150℃, 120-140 for low density polyethylene
℃, and in the case of polypropylene, the temperature should be 130 to 150℃, and the pressure of the vapor should be the saturated vapor pressure at the temperature. The temperature of the steam supplied into the curing tank 1 is adjusted by a pressure reducing valve.

As mentioned above, by setting the steam temperature at a temperature near the melting point of the thermoplastic resin coating the rod-shaped object 11, preferably at a humidity slightly higher than the melting point, the reinforcing fiber bundle is impregnated with the uncured thermosetting resin. The interface between the core and the coating thermoplastic resin becomes higher than the steam temperature due to the heat generated by the curing of the thermosetting resin, melting the inner part of the coating thermoplastic resin at the interface, thereby causing the core and the coating resin to melt. are adhered to each other by an anchoring effect under pressure. On the other hand, the surface of the coated thermoplastic resin that is in contact with the steam radiates heat to the steam and is maintained at approximately the steam temperature, thereby maintaining the roundness of the surface.

Rod-shaped object 11 heat-treated as described above in curing tank 1
is then introduced into the rear water tank 4b. At this time,
The through hole 8b of the silicone rubber gasket 7b forming the partition wall between the curing tank 1 and the water tank 4b is formed to be slightly larger than the diameter of the rod-shaped object 11 in order to prevent it from touching the molten coating thermoplastic resin.

In this water tank 4b, the coated thermoplastic resin is immediately cooled and solidified. This water tank 4b and the front water tank 4a are liquid seals to prevent the vapor in the hardening water tank 1 from dissipating and to prevent the vapor pressure from decreasing. It also serves as a cooling tank. The rod-shaped object 11 cooled in the water tank 4b is carried outside.

Since the rod-shaped object 11 heat-treated as described above has a rough surface with unevenness due to the steam,
If surface smoothness is required, the treatment may be carried out using the "rI & lim reinforced synthetic resin continuous rod surface forming method and apparatus" disclosed in Japanese Patent Application No. 57-209282, filed by the applicant of the present application.

As described above, according to the method and apparatus of the present invention, even if the thermosetting resin impregnated into the reinforcing 8M bundle of the core and the coating thermoplastic resin do not have chemical affinity, both can be maintained under pressure. Since the interface is bonded in a molten state, the bond is extremely strong due to the so-called anchor effect. - For example, if the core part is made of unsaturated polyester as the thermosetting resin and polyethylene is used as the covering thermoplastic resin, the adhesive strength between the two is 106 K when heat-treated on the steam side [40°C saturated steam pressure] (18-/c+], which was significantly increased compared to the conventional method.

With such an increase in adhesive strength, bending properties are improved. That is, the width of the reinforcing synthetic resin rod according to the present invention when it begins to break is improved by about 20% compared to when the coating is not bonded. Further, the heat treatment for curing the core and the coating thermoplastic resin can be performed at a speed 3 to 5 times faster than conventional heat treatment using hot water.

Furthermore, since the adhesion between the core and the coating thermoplastic resin is strong, the coating thermoplastic resin can be heated and melted again using the method of the above-mentioned Japanese Patent Application No. 57-209282 to make the surface smooth and thin. When molding, since the two do not separate at the interface, the molding can be done easily and at high speed.
The thickness of the coating can be made extremely thin.

In addition, in the apparatus of the present invention, both sides of the steam curing tank are water-sealed by water tanks, so while allowing the insertion of rod-shaped objects, the steam pressure can be kept constant, and the water tank on the rear side is The coating thermoplastic resin melted in the curing tank can be rapidly cooled and solidified again.

[Brief explanation of drawings]

The figure is a schematic diagram of an apparatus for curing the core of a rod-shaped article made of 51ix reinforced synthetic resin and melting, adhering, and solidifying the coating thermoplastic resin according to the present invention. Patent applicant: Ube Nizuka Kasei Co., Ltd. Agent: Patent attorney -Kensuke Shiro-11=

Claims (3)

[Claims] (1) A reinforcing core made by impregnating a reinforcing fiber bundle with an uncured thermosetting resin is coated with a molten thermoplastic resin, and then the thermoplastic resin is immediately cooled and solidified, and the rod-shaped object is placed in a curing tank. In the curing tank, steam at a temperature near the melting point of the coating thermoplastic resin is applied to the rod under pressure to cure the thermosetting resin in the reinforcing core and at the same time cure the coating thermoplastic resin. 1. A method for coating and curing a fiber-reinforced synthetic resin rod-shaped article, the method comprising: bringing the reinforcing core into close contact with the reinforcing core. (2) A water tank with a steam supply port on the outer periphery of one end of the curing tank with a long fence in the horizontal direction, and a condensed water outlet on the outer periphery of the (t!! end), and water inlets and outlets at the front and rear ends of the curing tank, respectively. are placed in close contact with each other, and a rod-shaped object having a reinforcing core made of a reinforcing 18M bundle impregnated with an uncured thermosetting resin and coated with a thermoplastic resin can be passed through the curing tank and the water tank. A coating curing device for a rod-shaped object made of dark blue reinforced synthetic resin, characterized by forming through holes. (3) The curing tank and the water tanks before and after the curing tank are partitioned by a silicone rubber gasket, and the through hole is formed in the silicone rubber gasket. Coating and curing equipment for reinforced synthetic resin rods.