JP2705404B2 - Cured product made of thermosetting resin - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a heating surface made of a thermosetting resin and has a heating means for setting the temperature of the heating surface to a predetermined value, and heats a material to be heated on the heating surface. The present invention relates to a thermosetting resin-made cured product used in the above.

[0002]

2. Description of the Related Art As a cured product made of a thermosetting resin having a heating surface made of a thermosetting resin and having a heating means for setting the temperature of the heating surface to a predetermined value, for example, FIGS.
A molding die using a thermosetting resin cured product of this type is disclosed in
No. 22210 and Japanese Utility Model Laid-Open No. 1-166521.

A cured product 71 made of a thermosetting resin shown in FIG.
The thermosetting resin 72 having a heating surface 72a has a structure in which a thermosetting resin 74 having a copper pipe 73 therein is provided on the side opposite to the heating surface 72a. A heating medium such as silicone oil at a predetermined temperature is poured into the heating member, thereby setting the temperature of the heating surface 72a of the thermosetting resin 72 to a predetermined value, and a member to be heated that comes into contact with the heating surface 72a, Used for thermoforming.

[0004] A cured product 81 made of a thermosetting resin shown in FIG.
The thermosetting resin 82 having a heating surface 82a has a structure in which a thermosetting resin 84 forming a heat medium flow path 83 is provided on the side opposite to the heating surface 82a. The cured product 81 made of a conductive resin has a state in which a heat-soluble bar is sandwiched between a thermosetting resin 82 forming a heating surface 82a and a thermosetting resin 84 for backing, and has a melting point of the heat-soluble bar. Also, the heating surface 82a is first-cured by heating at a low temperature, and thereafter, is heated at a temperature higher than the melting point of the heat-soluble bar to be second-cured, and at the same time, the heat-soluble bar is melted out. 83 is formed.

[0005] A cured product 91 made of a thermosetting resin shown in FIG.
A metal plate 94 made of aluminum or the like is fixed to the thermosetting resin 92 having a heating surface 92a on the side opposite to the heating surface 92a using an adhesive 93, and a sheet heater 95 is provided on the metal plate 94. The structure is such that the heating surface 92a is set to a predetermined temperature by generating heat by conducting electricity from the lead wires 96a and 96b.

A cured product 101 made of a thermosetting resin shown in FIG.
A carbon fiber woven fabric 103 is embedded in a thermosetting resin 102 having a heating surface 102a, and electrodes 104a and 104b are provided on the carbon fiber woven fabric 103;
Lead wires 105a, 105 connected to the wires 04a, 104b
b to generate heat so that the heating surface 102a is heated to a predetermined temperature.

[0007]

However, of the thermosetting resin cured products 71, 81, 91 and 101 described above, the thermosetting resin cured product 7 shown in FIGS. 7 and 8 is used.
In reference numerals 1 and 81, thermosetting resins 72 and 82 having heating surfaces 72a and 82a and thermosetting resins 74 and 84 for backing are provided.
It is necessary to sandwich the copper pipe 73 for forming the heat medium flow passage and the heat-soluble rod (83) between the heat-curable material and the heat-curable material. Since the heat conductivity and the specific heat of the conductive resins 72, 74, 82 and 84 are low, only the vicinity of the copper pipe 73 and the heat medium flow path 83 is heated, and the adjacent copper pipe 73 and the heat medium flow path 83 are heated. There is a problem that the temperature between the heating surfaces 72a and 82a may be non-uniform because the temperature is low in the portion between them.

On the other hand, in the cured product 91 made of a thermosetting resin shown in FIG. 9, when there is a large difference in the coefficient of thermal expansion between the thermosetting resin 92 and the metal plate 94, the overall deformation during heating is reduced. There is a problem that this is likely to occur.

On the other hand, in the cured product 101 made of a thermosetting resin shown in FIG. 10, the temperature rises only near the carbon fiber fabric 103 because the heat conductivity of the thermosetting resin 102 is low and the specific heat is small. However, there has been a problem that the temperature of other parts may be difficult to rise.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has been made in consideration of the above problem. It is an object of the present invention to provide a cured product made of a thermosetting resin, in which the process is not complicated.

[0011]

According to the present invention, there is provided a cured product made of a thermosetting resin having a heating surface made of a thermosetting resin and having a heating means for setting a temperature of the heating surface to a predetermined value. It is characterized in that an intermediate layer having good heat conductivity and higher specific heat than the thermosetting resin is provided between the thermosetting resin and the heating means. With the configuration of the invention according to the present invention, the above-mentioned conventional problem is solved.

In the cured product made of a thermosetting resin according to the present invention, an epoxy resin, a phenol resin, a polyimide resin, a polyester resin, or the like is used as the thermosetting resin, and in some cases, the thermosetting resin reinforced with fibers. Is used.

When reinforcing with fibers, carbon fibers are used as the reinforcing fibers, and PAN-based carbon fibers, pitch-based carbon fibers, and the like are used.

As the heating means for setting the temperature of the heating surface of the thermosetting resin to a predetermined value, a sheet heater, a sheath heater, an electromagnetic heating device, or the like is used.

Further, as the intermediate layer provided between the thermosetting resin and the heating means, one having good heat conductivity and a higher specific heat than that of the thermosetting resin is used. A material having at least one of flexibility and brittleness is used. As the intermediate layer, for example, a material obtained by solidifying graphite powder with a binder, or a metal particle having an uneven shape is used. And those using magnetic particles such as iron sand can be employed.

[0016]

The cured product made of a thermosetting resin according to the present invention has an intermediate layer between the thermosetting resin and the heating means, which has good thermal conductivity and a higher specific heat than the thermosetting resin. With this configuration, the heat from the heating means is uniformly transmitted to the heating surface via the intermediate layer, so that a temperature difference or uneven temperature on the heating surface is unlikely to occur. Even when there is a difference in the coefficient of thermal expansion between the curable resin and the heating means, the deformation due to the difference in the coefficient of thermal expansion is absorbed by the presence of the intermediate layer, and the cured product of the thermosetting resin is entirely deformed. Will be prevented.

[0017]

(Embodiment 1) FIGS. 1 and 2 show an embodiment of a thermosetting resin cured product according to the present invention. In this embodiment, an interior material of an automobile, particularly a molded ceiling is shown. FIG. 1 shows an example in which a hot press mold for molding is used.
Shows a case where the mold is used as a pair of molds composed of an upper mold and a lower mold.

As shown in FIGS. 1 and 2, a thermosetting resin cured product (mold) 11 is provided on the opposite side of the heating surface 12a of a carbon fiber reinforced thermosetting resin 12 having a heating surface 12a. , An intermediate layer 13, and the intermediate layer 13 is
4 is fixed by bolts 15a and nuts 15b, and the metal plate 14 is provided with a planar heater 16 acting as a heating means. The planar heater 16 is energized through lead wires 17a and 17b. It has a structured structure.

Among these, the thermosetting resin 12 has a heating surface (molding surface) 12a by curing a carbon fiber reinforced thermosetting resin (CFRP) by simultaneously applying heat and pressure in an autoclave or the like. Is what it is.

The metal plate 14 is made of an aluminum plate, has a function of dispersing the heat from the planar heater 16 in the plane direction, and is fixed together with the intermediate layer 13 by bolts 15a and nuts 15b.

Further, the intermediate layer 13 provided between the thermosetting resin 12 and the metal plate 14 transfers heat from the sheet heater 16 to the heating surface (molding) of the thermosetting resin 12 through the metal plate 14. Surface) 12a.
It has a function of absorbing a strain caused by a difference in thermal expansion during heating due to a difference in thermal expansion coefficient between the thermosetting resin 12 and the metal plate 14. It is assumed that the cured resin material 11 is not deformed as a whole.

The intermediate layer 13 is made by hardening graphite powder with a binder, has good thermal conductivity, has a higher specific heat than the thermosetting resin 12, and has a moderate elasticity. It is.

FIG. 3 shows lead wires 17 connected to the sheet heater 16 of the cured product 11 made of thermosetting resin shown in FIGS.
3A and 3B show the result of examining the temperature change on the heating surface 12a when the current is supplied through the terminals 17a and 17b. As shown in FIG. It is clear that there is not much difference between

As described above, in the cured product (molding die) 11 made of the thermosetting resin shown in the first embodiment, the heating surface (molding surface)
When the sheet 12a is heated to the moldable temperature of the molded ceiling, the heat generated by the sheet heater 16 causes the metal plate 14 made of aluminum to expand and expand more than the thermosetting resin 12, but the amount of expansion at this time is reduced. Since the difference is absorbed by the intermediate layer 13, the cured product 11 made of the thermosetting resin does not deform as a whole.

Further, during the production of the cured product 11 made of a thermosetting resin, the intermediate layer 13 and the metal plate 14 are separated from each other by the binder in the graphite forming the intermediate layer 13.
4, and the thermal expansion of the metal plate 14 causes some cracks in the graphite, but does not affect the heating surface 12a such as distortion. In addition, since no load is applied to the intermediate layer 13 using the graphite grains during molding, even if cracks occur in the graphite, no major problem occurs.

On the other hand, the heat generated from the sheet heater 16 is made uniform in the plane direction by the aluminum metal plate 14 and further transmitted to the heating surface 12a of the thermosetting resin 12 via the graphite intermediate layer 13. . The graphite intermediate layer 13 has a heat storage effect because it has a higher specific heat than the thermosetting resin 12 that forms the heating surface 12a, and can prevent poor adhesion of a molding material such as a cardboard due to insufficient heat. Become.

(Embodiment 2) FIG. 4 shows another embodiment of a cured product made of a thermosetting resin according to the present invention.
In this example, the configuration of the intermediate layer 13 is different from that of the first embodiment shown in FIG. 2, and the other components are the same.

That is, in the cured product 11 made of a thermosetting resin shown in FIG. 4, metal particles made of aluminum having an uneven shape are used as the intermediate layer 13.

The metal particles are used without using a binder or the like.

In the second embodiment, the planar heater 1
Aluminum metal plate 1 expanded by heating according to 6
The deformation of No. 4 is because the metal particles move by a small distance in the intermediate layer 13 and are absorbed by the gap between the adjacent metal particles.
Deformation does not occur in the entire cured product (molding die) 11 made of thermosetting resin.

(Embodiment 3) FIG. 5 shows still another embodiment of the cured product made of a thermosetting resin according to the present invention, which is different from that of Embodiment 2 shown in FIG. The case where the configuration of the means is changed is shown.

That is, in the cured product 11 made of a thermosetting resin shown in FIG.
And the sheath heater 16 is buried in the intermediate layer 13 made of metal particles such as aluminum having an uneven shape.

In Example 3, the sheathed heater 1
6, the heater 16 itself expands, but the metal particles having an uneven shape forming the intermediate layer 13 move by a small distance and are absorbed by the gaps between the adjacent metal particles. There is no possibility that the thermosetting resin-made cured product 11 is entirely deformed.

(Embodiment 4) FIG. 6 shows still another embodiment of the cured product made of a thermosetting resin according to the present invention. 11) has an intermediate layer 13 made of magnetic particles such as iron sand on the opposite side of the carbon fiber reinforced thermosetting resin 12 having a heating surface 12a, and this intermediate layer 13 is bolted together with an aluminum metal plate 14 with bolts 15a. And a nut 15b, and has a structure in which an electromagnetic heater 16 is provided on the metal plate 14 side as heating means.

In the fourth embodiment, the magnetic particles forming the intermediate layer 13 generate heat directly by the electromagnetic heater 16, and even when the intermediate layer 13 is thermally expanded and deformed by the heat generation, the intermediate layer 13 is deformed. Deformation is absorbed by the minute movement of the magnetic particles, so that the heating surface 1
2a is not affected.

[0036]

According to the present invention, there is provided a cured product made of a thermosetting resin having a heating surface made of a thermosetting resin, and having a heating means for setting the temperature of the heating surface to a predetermined value. In the cured product, the intermediate layer having good heat conductivity and a specific heat greater than that of the thermosetting resin was provided between the thermosetting resin and the heating means, so that the temperature of the heating surface was uniform. In addition, it is possible to suppress the overall deformation at the time of heating, it is possible to avoid a complicated manufacturing process, for example, when this is used as a molding die of a molded ceiling which is an interior material of an automobile In addition, the temperature of the entire molding surface becomes uniform, the shape accuracy becomes high, and a remarkably excellent effect that a molded product excellent in quality can be obtained is obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional explanatory view showing one embodiment (Example 1) of a cured product made of a thermosetting resin according to the present invention and showing a molding die composed of a pair of upper and lower cured products made of a thermosetting resin.

FIG. 2 is an explanatory cross-sectional view of a lower mold of a pair of thermosetting resin cured products shown in FIG. 1;

FIG. 3 is a cured product made of the thermosetting resin shown in FIG. 1 (mold).
6 is a graph illustrating a result of examining a change in temperature according to a heating time in a mold center portion and a mold end portion.

FIG. 4 is an explanatory cross-sectional view showing another embodiment (Example 2) of a cured product made of a thermosetting resin according to the present invention.

FIG. 5 is an explanatory sectional view showing still another embodiment (Example 3) of a cured product made of a thermosetting resin according to the present invention.

FIG. 6 is an explanatory sectional view showing still another embodiment (Example 4) of the thermosetting resin-made cured product according to the present invention.

FIG. 7 is an explanatory sectional view showing an example of a conventional cured product made of a thermosetting resin.

FIG. 8 is an explanatory cross-sectional view showing another example of a conventional cured product made of a thermosetting resin.

FIG. 9 is an explanatory sectional view showing still another example of a conventional cured product made of a thermosetting resin.

FIG. 10 is an explanatory cross-sectional view showing still another example of a conventional cured product made of a thermosetting resin.

[Explanation of symbols]

 Reference Signs List 11 cured product made of thermosetting resin 12 thermosetting resin 12a heating surface 13 intermediate layer 16 heater (heating means)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location B29K 101: 10 103: 04

Claims (1)

(57) [Claims] 1. A cured product made of a thermosetting resin having a heating surface made of a thermosetting resin and having a heating means for setting the temperature of the heating surface to a predetermined value, wherein the thermosetting resin, the heating means, A cured product made of a thermosetting resin, wherein an intermediate layer having good thermal conductivity and a specific heat higher than that of the thermosetting resin is provided between the two.