JPS61103933A - Fiber-reinforced epoxy resin article - Google Patents

Abstract

PURPOSE:To provide the titled resin article obtained by applying a layer to prevent the complete curing to a specific part of a fiber-reinforced epoxy resin article, and capable of forming a bonded part having same strength as the resin article by removing the incompletely cured part of the resin with a solvent and exposing the reinforcing fiber. CONSTITUTION:In the forming of a fiber-reinforced epoxy resin 1 composed of an epoxy resin 2 crosslinkable with a curing agent and containing reinforcing fibers 3, a layer 4 for preventing the complete curing of the resin is formed to a specific part of the resin using a cure-preventive agent composed of (A) a compound having a functional group reactive with epoxy group rapidly in high conversion (e.g. aliphatic dialkylamine) or (B) a compound having a functional group reactive with the crosslinking functional group of the curing agent rapidly in high conversion (e.g. glycidyl ether), and the part applied with the agent is maintained in an incompletely cured state. In the case of bonding, the resin 2 of the part 4 is removed by a solvent to expose the fiber 3, the exposed fibers are entangled, and a resin 16 is supplied to the bonding part to effect the firm bonding of the resin article.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a plate-shaped or cylindrical material formed by incorporating various fibers such as glass fiber, carbon fiber, or aramid fiber into an epoxy resin that is cross-cured with a curing agent. The present invention relates to a fiber-reinforced epoxy resin body that is employed to melt a portion of the resin in order to bring the pipe-shaped fiber-reinforced epoxy resin body into a state favorable for joining.

Structure of conventional example and its problems As shown in Fig. 16, a fiber-reinforced epoxy resin body (2
), conventionally, as shown in Figure 17, the joining side end of the fiber-reinforced epoxy resin body (to) is made into a tapered surface (to), and the resin and glass are bonded between the tapered surfaces (to). There is a taper wrap method in which secondary laminated materials containing fibers are laminated, and as shown in Figure 18, secondary laminated materials are used between joints that do not have a tapered surface as described above. The 19th layer wrap method, in which layers are stacked only on the - side, and the 19th
As shown in the figure, the secondary laminate material (7
) was used. However, in any of these methods, the laminated interface is between the resins and no glass fibers pass through them, so the same strength as the base material (ie, the fiber-reinforced epoxy resin body) could not be expected at the joint. In order to increase the strength of the joint, the resin (1) near the joint end of the fiber-reinforced resin body (to) was removed to expose the glass fibers (01), and the exposed glass fibers (b) were entangled with each other. It is conceivable to harden the core with resin in the (wrapped) state. However, conventionally, it was thought that there was no technology for separating glass fiber 6η and epoxy resin (1). This is because the epoxy resin, once cross-cured with a curing agent, cannot be dissolved simply.

OBJECTS OF THE INVENTION An object of the present invention is to provide a fiber-reinforced epoxy resin body that can melt epoxy resin at high speed.

Structure of the Invention In order to achieve the above object, the present invention provides an epoxy group of an epoxy resin at a predetermined location of a fiber-reinforced epoxy resin body, which is formed by incorporating reinforcing fibers into an epoxy resin that is cross-cured with a curing agent. A compound that has one functional group in the same molecule that reacts with the crosslinking functional group of the curing agent at high speed and high reaction rate, or one functional group that reacts with the crosslinking functional group of the curing agent at high speed and high reaction rate in the same molecule To provide a fiber-reinforced epoxy resin body, characterized in that the predetermined regions are kept in an incompletely cured state by forming in advance a layer for preventing complete curing containing a curing inhibitor made of a compound. .

In the fiber-reinforced epoxy resin body of the present invention, in the region where the complete curing prevention layer is provided, the epoxy resin or the curing agent is cured before the epoxy resin reacts with the curing agent and is cross-cured. Due to the reaction with the inhibitor, the epoxy resin remains uncured in the area, and therefore, the uncured portion of the epoxy resin can be easily removed with a suitable dissolving agent to expose the reinforcing fibers inside. Become.

Embodiments Hereinafter, embodiments of the present invention will be described based on FIGS. 1 to 15. i In Figure 1, (1) is a fiber-reinforced epoxy resin body, and the epoxy resin (2) that is crosslinked and cured by a hardening agent may also be glass fiber (carbon fiber or aramid mi) (3)
It is constructed by incorporating the

The fiber-reinforced epoxy resin body (1) is provided with a layer (4) for preventing complete hardening over a length Ll on both sides of one end thereof. This complete hardening prevention layer (4) is made of fiber-reinforced epoxy resin (
It is formed by directly spraying a film containing an anti-curing agent through the tape during molding in step 1). Materials used for the tape include cloth-like fibrous materials such as cotton and acrylic μ, film-like materials such as polyvinyl μ-alcohol, polyamide, Borienether, and cellophane, and paper. is impregnated.

A typical epoxy resin is bispheno-/'VA
Examples include epoxy resins. In addition, as a curing agent for epoxy resin, it is a compound that has two or more functional groups (such as amino groups) that react with the epoxy group of the epoxy resin in the same molecule, and typical examples include modified polyamine, modified aromatic Examples include polyamines, modified polyamides, and amino acid anhydrides.

In addition, curing inhibitors are mainly composed of compounds that have one functional group in the same molecule that reacts with the epoxy group of the epoxy resin at high speed and high reaction rate, and those that have one functional group that reacts with the epoxy group of the epoxy resin at high speed and high reaction rate. It can also be classified into compounds that have one functional group in the same molecule that reacts with a high reaction rate. Examples of the former curing inhibitor include aliphatic dialkylamine, alkoxy anion, thioalkoxy anion, and the like. On the other hand, the latter curing inhibitors include glycidyl ether, glycidyl ester μ, shrimp chlorohydrin, glycid-p
Examples include monofunctional epoxy compounds such as, monofunctional thioepoxy compounds in which the oxygen in the epoxy group in these monofunctional epoxy compounds is replaced with sulfur, and monofunctional phosphoric acids. These curing inhibitors react with the epoxy resin or the curing agent before the crosslinking reaction between the epoxy resin and the curing agent (although a partial crosslinking reaction also occurs), so the layer for completely preventing curing is (4) The portion (2B) of the epoxy resin (2) located in between is maintained in an incompletely cured state.

In Figures 2 and 3, (5) has a dissolution chamber (6) inside.
a body forming a front opening (7) at the intermediate level p;
and a side opening (8). A nozzle /L/ (9) facing the front opening (7) is provided on the rear wall of the main body (4), and a dissolving agent receiver αQ is provided on the bottom wall. This solvent receiver αQ and the nozzle /L/ (9) communicate with each other through a pipe (b), and a pump @ and a heating device (to) are provided in this pipe (b). In addition, the solubilizer receiver α
Q is provided with a cooling device (G) for cooling the dissolving agent α♦.

As the solubilizing agent (b), a solvent alone or a mixture of a solvent and an erosive agent may be used. Examples of solvents used here include chlorine-containing hydrocarbons (e.g. methylene chloride, chloroform), fluorine-based hydrocarbons (e.g. Hachensen, toluine, xylene), and aprontic polar solvents (e.g. dimethyl μfopmamide, dimethyl sulfoxide). , Kents (for example, methi-μ-ethy-Kent, acetone), Esthe-μs (for example, methyμ-acetate, ether), etc. are used. Also, if erosion is 1, non-ionic (e.g. polyoxyethylene 7
μkiρete p, polyoxyethylene a! Kippheno-
The fiber-reinforced epoxy resin body ( 1), the tip side entered the dissolution chamber (6) through one side opening (8) and moved through the front opening (7) while being conveyed at a constant speed by a conveying means (not shown). Later the other side opening (8)
go out from A small amount of the dissolving agent α is injected from the nozzle 1V (9) to the tip of the fiber-reinforced epoxy resin body (1) that is moving in the dissolving chamber (6). That is, the solubilizer α in the solubilizer receiver αq is taken out to the pipe (6) by the bonder,
After it is heated by the heating device (2) and mixed with air, it is blown with high-speed air from the nozzle tv (9). At this time, the dissolving agent Q4 can be activated by heating, and the increase in temperature can be promoted by applying pressure. By air spraying the dissolving agent α→, the epoxy resin (2) is dissolved at the tip of the fiber-reinforced epoxy resin body (1).

It flows down into the dissolving agent receiver aQ together with the dissolving agent Q4. At that time, the distance color on the tip side of the fiber-reinforced epoxy resin body (1))
Inside, since the resin (2B) between the two prevention layers (4) is left in an incompletely cured state, dissolution occurs at high speed. As a result, the epoxy resin (2) is removed from the tip of the fiber-reinforced epoxy resin body (1) coming out of the main body (5), as shown in FIG. 4, and the glass fibers (3) are exposed. Resin (2a) flowing down into the solvent receiver αQ
(Solid particles that have already hardened due to partial polymerization)
is stored in the seat as drain, and the dissolving agent (b) is reused. At this time, the dissolving agent α→ is cooled by a cooling device (g) and is prevented from being gasified.

The fiber-reinforced epoxy resin body (1) melted as described above has exposed glass fibers (
3) After wrapping (wrapping) the two, the intertwined parts can be joined by hardening them with resin edges as shown in Figure 6. At this time, the joined parts are made of the base material, that is, the fiber-reinforced epoxy resin body (1). It can be made to have almost the same strength.

FIG. 7 shows another embodiment of the dissolving means. That is, the fiber-reinforced epoxy resin body (1) is held from both sides by the holding device (b), and the newly manufactured part is subjected to high-speed vibration by the operation of the vibrator (to) attached to the holding device αη. It is immersed in the solubilizing agent α→. As a result, interfacial cavitation occurs in the immersed part of the fiber-reinforced epoxy resin body (1), and the epoxy resin (2)
) is melted and the glass fibers (3) are exposed as shown in FIG.

FIG. 8 shows another example in which a complete hardening prevention layer (4) is laminated on the outer surface of the fiber-reinforced epoxy resin (1).

According to this, the resin (2B) between the M (4) for preventing complete curing
) will be left in an incompletely cured state.

As shown in FIG. 9, - of fiber reinforced epoxy resin (1)
When the complete hardening prevention layer (4) is laminated only on the surface, the middle part in the thickness direction will be left in an incompletely hardened state as shown by the virtual line q). When used and melted, a concave portion α in which the glass fiber (3) is exposed is formed as shown in FIG. Then, as shown in FIG. 4, the fiber reinforced epoxy resin body 0) with the glass fibers (3) exposed at the end is
As shown in Figure 1, by intertwining both glass fibers (3) and then supplying and solidifying the resin αQ, it is possible to form an inverted T-shaped joint. With this method, it is possible to obtain a deformed structure of a large structure with increased strength through easy joining of plates without performing complicated integral molding.

In the configuration in which the glass fiber (3) is exposed at the tip shown in FIG. 4, it is also possible to join in a corner shape as shown in FIGS. 12 and 13. ) can be made into a thin plate by bending, for example, the body of an aircraft can be obtained without riveting.

When the glass fibers (3) are exposed and bonded only on the surface as shown in FIG. 14, for example, a corrosion-resistant device can be obtained. In this case, the secondary bonding surface can be sufficiently reinforced compared to the conventional secondary bonding to a mere resin surface or a grinder surface.

In a similar manner, as shown in FIG. 15, the pipe holder opening (20A) and spigot (20B) can be firmly joined.

Effects of the Invention According to the present invention described above, the complete curing prevention layer formed in advance at a predetermined location of the fiber-reinforced epoxy resin body causes the epoxy resin near the complete curing prevention layer to be in an incompletely cured state (
This makes it easier to separate the epoxy resin at predetermined locations. By treating a predetermined location with a dissolving agent, the epoxy resin at the predetermined location can be removed at high speed to expose the fibers, thereby facilitating strong bonding between multiple fiber-reinforced epoxy resin bodies. be able to.

[Brief explanation of drawings]

Fig. 1 to Fig. 6 show an embodiment of the present invention, Fig. 1 is a side view, Fig. 2 is a vertical side view in a melted state, Fig. 3 is a plan view of the same, and Fig. 4 is a removed epoxy resin. FIGS. 5 and 6 are side views showing a bonded state, FIG. 7 is a longitudinal sectional view showing another melting state, and FIG. 8 is a side view showing another forming state, and FIGS. Fig. 11 is a side view showing one usage example, Figs. 12 and 13 are side views showing another usage example, Fig. 14 is a side view showing the joined state, and Fig. 15 is a side view showing the joining state. 16 to 19 are side views showing conventional bonding states. (1)--Fiber-reinforced epoxy resin body, (2)...Epoxy resin, (2a)...Removed resin, (3)...
・Glass fiber, (4)...Complete hardening prevention layer, (5)
... Main body, (6) ... Melting chamber, (7) ... Front opening, (8) ... Side opening, (9) ... Nozzle, αQ
...Dissolving agent receiver, (B)... Piping, (2)... Pump, (To) --- Heating device, α - Solving agent, (To)... Cooling device, αQ ...resin, ση...clamping device, (g)...vibrator, (to)...recess, wire ---pipe, (2OA)...receiver, (20B)...
...Representative Agent Yoshihiro Morimoto Figure 2 Figure 3 A Figure 7

Claims (1)

[Claims] 1. The same functional group that reacts with the epoxy group of the epoxy resin at a high speed and with a high reaction rate is added to a predetermined location of the fiber-reinforced epoxy resin body, which is formed by incorporating reinforcing fibers into an epoxy resin that is cross-cured by a curing agent. A layer for complete curing prevention containing a curing inhibitor consisting of a compound having one compound in the molecule or a compound having one functional group in the same molecule that reacts with the crosslinking functional group of the curing agent at high speed and high reaction rate. A fiber-reinforced epoxy resin body, characterized in that the region at the predetermined location is maintained in an incompletely cured state by forming in advance.