JPH10296775A - Manufacture of winding coil-containing reaction injection molded item - Google Patents

Abstract

PROBLEM TO BE SOLVED: To upgrade close contact of a winding coil with resin and to manufacture a reaction injection molded item of predetermined quality by disposing the coil in a mold, and performing reaction injection molding in a cavity of the mold while electromagnetic induction heating is performed for the coil from the outside of the mold in the state that the mold is closed. SOLUTION: A winding coil 10 is disposed between a lower mold 2 and an upper mold 3, and a gap is provided between the coil 10 and an inner periphery of the mold by a spacer or the like. Then, parting surfaces of the molds 2, 3 are matched, and reaction stock solution is injected from a filling port in a cavity 4. Simultaneously at the time of clamping the molds, or from thereafter, a high frequency magnetic field generator 20 is driven to apply a high frequency magnetic field to the coil 10. Since the coil 10 is formed of a metal wire material, when the field is applied to the coil 10, an eddy current flows, and the coil 10 is hence heated. Accordingly, since the coil 10 is also heated, reaction at a part in contact with the coil 10 is satisfactorily proceeded to upgrade adhesive properties of the coil 10 with the resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a reaction injection molded article with a built-in winding coil, and more particularly, to a molded article in which all or a part of a winding coil is embedded by reaction injection molding. The present invention relates to a method for producing a reaction injection molded article with a built-in winding coil for performing the method.

[0002]

2. Description of the Related Art Reaction injection molding (hereinafter also referred to as RIM).
In the method, two reaction stock solutions are mixed in a mixing chamber, fed into a cavity of a mold, and injection-molded while reacting in the mold. This RIM method is suitably used for forming a polymer (molded article) from a norbornene-based monomer.

In order to form a molded body in which all or a part of a wound coil made of metal is embedded in the molded body by such a RIM method, for example, the winding coil is placed in a mold. The coil is arranged, and if necessary, a part of the coil is exposed to the outside of the mold, and the reaction injection molding is performed in the mold.

[0004]

However, in such reaction injection molding, the reaction heat in the vicinity of the winding coil is absorbed by the winding coil, and the resin cannot be sufficiently cured. Since the coil and the resin did not adhere to each other, the characteristics of the molded product were sometimes unstable.

[0005] In order to prevent such inconveniences, there is a case where a method of heating a winding coil in advance and disposing it in a mold is adopted.

[0006] However, in such a method, it is difficult to keep the degree of heating constant, or if molding is performed after a certain period of time has elapsed after heating, the wound coil is cooled, There is a problem that the effect is lost. Further, if the time after heating is not constant, the temperature of the metal winding coil varies, so that there is also a problem that a molded article of constant quality cannot be obtained.

As disclosed in Japanese Patent Application Laid-Open No. 49-63,953, a method has been proposed in which a metal wound coil is energized to generate heat during molding of a cured resin. There is a problem that it is applied only when a part of the coil is exposed to the outside of the mold.

In particular, in the reaction injection molding, it is necessary to promote the reaction well and take care that the temperature does not rise too much due to the heat of the reaction. It was important to keep However, in the conventional method, heat transfer to the winding coil causes heat of reaction of the resin in the vicinity of the winding coil to be deprived, and the resin cannot be sufficiently cured. Due to the lack of adhesion, the characteristics of the molded body were sometimes unstable.

The present invention has been made in view of such circumstances, and even when a molded article in which a winding coil is embedded inside a molded article is formed by reaction injection molding, good adhesion between the wound coil and the resin is obtained. It is an object of the present invention to provide a method for producing a reaction injection molded article with a built-in coil, which can produce a reaction injection molded article having a certain quality.

[0010]

Means for Solving the Problems To achieve the above object, a method of manufacturing a reaction injection molded article with a built-in winding coil according to the present invention comprises disposing a winding coil inside a mold, and removing the mold. In the closed state, reaction injection molding is performed in the cavity of the mold while electromagnetically heating the wound coil from outside the mold.

(Reaction Injection Molding) The reaction stock solution used for reaction injection molding is not particularly limited, and examples thereof include urethane-based, urea-based, nylon-based, epoxy-based, unsaturated polyester-based, phenol-based, and norbornene-based solutions. As a general molding condition, the reaction solution temperature is 20 to 8
At 0 ° C., the viscosity of the reaction stock solution is, for example, 5 cps to 3000 cps, preferably 100 cps at 30 ° C.
It is about 1000 cps.

In such molding, a reinforced polymer (molded body) can be manufactured by placing a reinforcing material in a mold in advance and supplying a reaction liquid therein to polymerize.

Examples of the reinforcing material include glass fiber, aramid fiber, ultra high molecular weight polyethylene fiber, polypropylene fiber, cotton, acrylic fiber, boron fiber, silicon carbide fiber, alumina fiber and the like. These reinforcing materials can be used in various shapes, such as those obtained by forming a long fiber or chopped strand into a mat, woven into a cloth, or remaining in a chopped shape. It is preferable that the surface of these reinforcing materials is treated with a coupling agent such as a silane coupling material in order to improve the adhesion to the resin. The amount of the reinforcing material is not particularly limited.
10% by weight or more, preferably 20 to
60% by weight.

Further, various additives such as an antioxidant, a filler, a pigment, a colorant, a foaming agent, a flame retardant, a slide imparting agent, an elastomer, a dicyclopentadiene-based thermopolymerized resin and a hydrogenated product thereof are compounded. Thereby, the characteristics of the obtained polymer can be modified.

As the antioxidant, there are various antioxidants for plastics / rubbers such as phenol type, phosphorus type and amine type. Fillers include inorganic fillers such as milled glass, talc, calcium carbonate, aluminum hydroxide, mica, potassium titanate, calcium sulfate, and the like. Examples of the elastomer include natural rubber, polybutadiene, polyisoprene, styrene-butadiene copolymer (SBR), and styrene-butadiene-styrene block copolymer (SB).
S), styrene-isoprene-styrene block copolymer (SIS), ethylene-propylene-diene terpolymer (EPDM), ethylene-vinyl acetate copolymer (EV
A) and hydrides thereof.

The additive is usually mixed in advance with one or both of the reaction solutions.

The mold used for the reaction injection molding is not necessarily made of metal, and is preferably made of a material which does not shield magnetism and has heat resistance. Although not particularly limited, for example, Teflon, polyester, epoxy, sand , Wood, ceramics, reaction injection molds of dicyclopentadiene, and the like. Reaction injection molding uses a low-viscosity reaction liquid and can be molded at a relatively low temperature and a low pressure. Therefore, it is not always necessary to use a highly rigid and expensive mold. The inside of the mold is preferably sealed with an inert gas, and the components used for the polymerization reaction are preferably stored and operated under an atmosphere of an inert gas such as nitrogen gas.

The mold temperature is preferably from 10 to 150
° C, more preferably 30 to 120 ° C, still more preferably 50 to 100 ° C. The temperature control of the mold can be performed by providing a passage for the heat medium in the mold and circulating the heat medium. Mold pressure is usually 0-100K
g / cm ² . The polymerization time may be appropriately selected, but is usually 30 seconds to 20 minutes after the completion of the injection of the reaction solution.
Preferably, it is 5 minutes or less.

(Wound coil) In the present invention, for example, a winding coil used in a magnetic levitation railway is used as the winding coil. A winding coil used in a magnetic levitation railway is an air-core coil without an iron core wound around a conductive wire, and the wire is usually coated with an insulating material or the like and used as an insulated wire. Specific examples of the conductive wire used for the winding coil include aluminum, copper, iron, nickel, gold,
A common magnetic metal such as silver or a mixture thereof is mentioned as a material, and the wound coil is preferably made of aluminum for reasons such as cost reduction, weight reduction, and workability.

The cross-sectional shape of the conductive wire may be polygonal, circular, or the like, but is preferably rectangular from the viewpoint of workability, and the width of the rectangle is 1 mm or more and 20 mm or less, preferably 3 mm or more.
The thickness is 0 mm or less, and the thickness is 1 mm or more and 20 mm or less, preferably 3 mm or more and 10 mm or less.

Examples of the insulating-coated wire include epoxy powder-coated rectangular wire, polyethylene powder-coated rectangular wire, paper-wound rectangular wire, Nomex-wound rectangular wire, Kapton-wound rectangular wire, mica-wound rectangular wire, and glass-wound rectangular wire. And rectangular formal wire. Epoxy powder-coated rectangular wire is particularly preferable because it does not inhibit the bulk ring-opening polymerization reaction of the norbornene-based monomer and its processability.

The coating thickness of the insulated wire is 0.01 mm
Not less than 1 mm, preferably not less than 0.03 mm and 0.5 m
m, more preferably 0.05 mm or more and 0.1 mm or less.

(Electromagnetic Induction Heating) In the present invention, the strength and frequency of the magnetic force for electromagnetically heating the winding coil from outside the mold are determined according to the size and material of the winding coil. The device for performing the electromagnetic induction heating is not particularly limited as long as it can change the strength and direction of the magnetic field. For example, a high-frequency magnetic field generator or the like can be used.

By applying a magnetic force wave (a magnetic field whose strength or direction changes) from the outside of a mold made of a material that does not shield magnetism, eddy currents and the like flow through a winding coil arranged inside the mold, It is heated by electromagnetic induction. The temperature of the winding coil is
Preferably, it is 10 to 150 ° C., more preferably 30 to 150 ° C.
It is desirable to heat to a temperature of 120 ° C, more preferably about 50 to 100 ° C. This electromagnetic induction heating is preferably performed until the cooling step in the reaction injection molding.

In the present invention, the winding coil may be heated to a predetermined temperature by a burner or the like before the winding coil is placed in the mold.

(Function of the Invention) In the method for producing a reaction injection molded article with a built-in winding coil according to the present invention, not only the mold but also the winding coil inserted into the mold is heated during the reaction injection molding. Therefore, the reaction at the portion in contact with the winding coil proceeds well, and the adhesion between the winding coil and the resin is improved.
Further, even after the mold is closed, the wound coil can be heated, so that a reaction injection molded article of a constant quality can be always obtained. Further, in the present invention, since the winding coil is heated in a non-contact manner, even if the winding coil is completely embedded in the inside of the molding, the winding coil and the resin may be in close contact with each other. Properties can be kept good.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for manufacturing a reaction injection molded article with a built-in winding coil according to the present invention will be described in detail based on an embodiment shown in the drawings.

FIG. 1 is a schematic view showing a method of manufacturing a reaction injection molded article with a built-in winding coil according to an embodiment of the present invention, and FIG. 2 is a diagram showing a reaction injection molded article with a built-in winding coil obtained by the method according to the present invention. It is a schematic perspective view which shows an example.

As shown in FIG. 2, in the present embodiment, a method of manufacturing a panel 30 with a built-in winding coil used as a ground coil for a magnetic levitation type railway will be described as a method of manufacturing a reaction injection molded body with a built-in winding coil. I do.

As shown in FIG. 1, the mold used in the present embodiment has an upper mold 3 and a lower mold 2, and their cut surfaces are combined to form a panel-shaped cavity therein. 4 are formed.

In the present embodiment, the upper mold 3 and the lower mold 2 have the same shape and structure.

The lower mold 2 and the upper mold 3 of the present embodiment are, for example, Teflon, polyester, epoxy, sand,
It is made of a material that does not shield magnetism, such as wood, ceramic, and reaction injection molds of dicyclopentadiene. Although not shown, these dies 2 and 3 are formed with passages for a heat medium to flow therethrough, so that the temperatures of the dies 2 and 3 can be adjusted.

As shown in FIG. 1, the winding coils 10 are wound around the dies 2 and 3 from the outside of the dies 2 and 3 with the dies 2 and 3 closed. Is provided with a high-frequency magnetic field generator 20 for performing electromagnetic induction heating. The high-frequency magnetic field generator 20 may be attached to each of the upper mold 3 and the lower mold 2, or may be attached to a part different from the molds 2 and 3. In any case, the high-frequency magnetic field generator 20 is arranged on the entire circumference or a part of the molds 2 and 3. The high-frequency magnetic field generator 20 is formed of, for example, an electromagnet wound with a winding coil, and generates a high-frequency magnetic field.

In this embodiment, the winding coil 10 shown in FIG. 1 is made of a metal wire such as aluminum having a linear expansion coefficient substantially equal to that of the reaction injection molded resin, and the metal wire is formed into a rectangular or race track shape. Horizontal 50mm or more 100
0 mm or less, preferably 100 mm or more and 800 mm or less, more preferably 200 mm or more and 300 mm or less, 50 mm or more and 500 mm or less, preferably 100 mm or more and 400 mm or less, more preferably 200 mm or more and 30 mm or less.
1 to 50 rolls, preferably 5 to 30 rolls, more preferably 10 to 20 rolls,
What is rolled within the winding as it is, or what is piled up from 2 to 10 steps, 0.1 mm to 3 mm,
Preferably, with a distance of 0.5 mm or more and 2 mm or less,
It has a shape in which unit coils obtained by stacking two sets are connected in a figure eight shape.

In this embodiment, the cross-sectional shape of the metal wire is
A rectangle is adopted because of workability, and the width of the rectangle is 1 mm or more and 20 m.
m, preferably 3 mm or more and 10 mm or less, thickness 1 m
m or more and 20 mm or less, preferably 3 mm or more and 10 mm or less.

As shown in FIG. 1, the winding coil 10 of the present embodiment is arranged so as to completely enter the inside of the dies 2 and 3. However, the terminal 34 of the winding coil 10 is attached to the mold so as to be exposed outside the mold.

In the reaction injection molding, first, the lower mold 2
The winding coil 10 is arranged between the upper coil 3 and the upper mold 3, and a gap is provided between the coil 10 and the inner peripheral surface of the mold by a spacer or the like. Before placing the winding coil 10 in the mold, the winding coil 10 is placed in an oven or the like at 50 to 100 °.
It is preferable to heat to about C.

Next, the split surfaces of the dies 2 and 3 are aligned, and a reaction solution is injected into the cavity 4 from an injection port (not shown). The high-frequency magnetic field generator 20 shown in FIG. 1 is driven at the same time as or after the clamping of the molds 2 and 3 to apply a high-frequency magnetic field to the winding coil 10 inside the molds 2 and 3. Since the winding coil 10 is made of a metal wire, when irradiated with a high-frequency magnetic field, an eddy current is generated and the winding coil 10 is heated. The heating temperature of the winding coil 10 is adjusted according to the maximum magnetic flux density and the frequency of the high-frequency magnetic field. The winding coil 10 is preferably 10 to 150
C., more preferably from 30 to 120.degree. C., and even more preferably from 50 to 100.degree.

(Norbornene-Based Monomer) When the reaction injection molding is a reaction injection molding using a norbornene-based monomer, the monomer used in the present embodiment may be one having a norbornene ring. Any of these may be used, but it is preferable to use a tricyclic or higher polycyclic norbornene-based monomer since a molded article having excellent heat resistance can be obtained.

Specific examples of the norbornene-based monomer include:
Bicyclics such as norbornene and norbornadiene; tricyclics such as dicyclopentadiene and dihydrodicyclopentadiene; tetracyclics such as tetracyclododecene; pentacyclics such as tricyclopentadiene; heptacyclics such as tetracyclopentadiene Substituents such as alkyl such as methyl, ethyl, propyl and butyl, alkenyl such as vinyl and the like, alkylidene such as ethylidene and the like such as aryl such as phenyl, tolyl and naphthyl; furthermore, ester groups, ether groups, cyano groups and halogens thereof; Substitutes having a polar group such as an atom are exemplified. These monomers may be used in combination of one or more kinds. It is easy to obtain, excellent in reactivity,
From the viewpoint of excellent heat resistance of the obtained resin molded body, tricyclic,
Tetracyclic or pentacyclic monomers are preferred.

The resulting ring-opening polymer is preferably of a thermosetting type. For this purpose, among the norbornene-based monomers described above, the reactivity of dicyclopentadiene, tricyclopentadiene, tetracyclopentadiene and the like is high. Those containing at least a crosslinkable monomer having two or more double bonds are used. The proportion of the crosslinkable monomer in all the norbornene-based monomers is usually 2 to 30% by weight.

It should be noted that, within a range not to impair the object of the present invention,
Monocyclic cycloolefins such as cyclobutene, cyclopentene, cyclopentadiene, cyclooctene and cyclododecene, which can be ring-opening copolymerized with norbornene monomers,
It may be used as a comonomer.

(Metathesis Catalyst) In the present invention, a catalyst preferably used for polymerizing norbornene monomers is a metathesis catalyst. The metathesis catalyst is RIM
The method is not particularly limited as long as the norbornene-based monomer can be subjected to ring-opening polymerization by the method, and may be a known one. For example, organic molybdates such as tungsten hexachloride, tridodecyl ammonium molybdate, and tri (tridecyl) ammonium molybdate, and organic ammonium molybdates such as ammonium acid are used.

The amount of the metathesis catalyst to be used is generally 0.01 mmol or more, preferably 0.1 mmol or more, 50 mmol or less, preferably 20 mmol or less, per 1 mol of the monomer used in the whole reaction solution. is there. If the amount of the metathesis catalyst used is too small, the polymerization activity is too low and the reaction takes a long time, so the production efficiency is poor.If the amount is too large, the reaction is too vigorous and the resin hardens before being sufficiently filled in the mold. Or the catalyst is likely to precipitate, making it difficult to store homogeneously. The metathesis catalyst is usually used by dissolving it in a monomer. However, as long as the properties of the molded article obtained by the RIM method are not substantially impaired, the metathesis catalyst is suspended and dissolved in a small amount of a solvent, By mixing with the body, precipitation may be suppressed or solubility may be enhanced.

(Activator and activity regulator) In the present invention, RIM molding is performed using an activator, also called a metathesis cocatalyst, together with a metathesis catalyst. Activator is RIM
The method is not particularly limited as long as it can activate a metathesis catalyst capable of ring-opening polymerization of a norbornene-based monomer by a method, and may be a known one. For example, JP-A-58-127728, JP-A-4-226124, and JP-A-58-12
As described in JP-A No. 9013 and JP-A-6-145247, organic aluminum alloys such as alkylaluminum, alkylaluminum halide, alkoxyalkylaluminum halide and arylalkylaluminum halide, and organotin compounds are exemplified.
These activators are used alone or in combination of two or more.

The use amount of the activator is not particularly limited,
Usually, 0.1 mol or more, preferably 1 mol or more, and 1 mol per 1 mol of the metathesis catalyst used in the whole reaction solution.
It is at most 00 mol, preferably at most 10 mol. If no activator is used or the amount of activator used is too small,
Since the polymerization activity is too low and the reaction takes time, the production efficiency deteriorates. Conversely, if the amount used is too large, the reaction may be too vigorous and may be cured before the mold is sufficiently filled. The activator is used by dissolving it in the monomer. However, the activator should be suspended in a small amount of solvent and then mixed with the monomer as long as the properties of the molded article by the RIM method are not substantially impaired. May be used to make precipitation difficult or to increase solubility.

In the present invention, generally, an activity regulator is used in combination with the above active agent. The use of an activity regulator can change the reaction rate, the time from the mixing of the reaction solution to the start of the reaction, the reaction activity, and the like.

As the activity regulator, a compound having an action of reducing the metathesis catalyst is used, and as the activity regulator, alcohols, haloalcohols, esters, ethers, nitriles and the like are exemplified. Among them, specific examples of alcohols include n-propanol, n-butanol, n-hexanol, 2-butanol, isobutyl alcohol, isopropyl alcohol, t-butyl alcohol, and the like. Specific examples of halo alcohols Examples include 1,3-dichloro-2-propanol, 2-chloroethanol, 1-chlorobutanol, and the like.

The amount of the activity modifier varies depending on the compound used, and is not uniform.

(Other optional components) If desired, an antioxidant, a filler, a pigment, a colorant, a foaming agent, a sliding agent, a flame retardant, a combustible, an elastomer, a dicyclopentadiene-based thermopolymer resin, Various additives such as the hydrogenated product can be blended into the reaction stock solution, and the resulting RIM
Product properties can be modified.

For the purpose of obtaining a molded article having particularly high mechanical strength, a reinforcing material can be filled in a mold in advance, and then a polymerization reaction solution can be poured into the mold and cured. The filling amount of the reinforcing material is not particularly limited, but is usually 10% by weight or more, preferably 20 to 60% by weight based on the total weight of the monomers. If the filling amount is small, the ratio of the mechanical strength is small.
If the filling amount is too large, uneven filling may occur without uniform filling, or filling may be hindered.

For the purpose of adjusting the viscosity of the reaction solution, an elastomer may be added to the reaction solution. By adding the elastomer to the reaction solution, the impact resistance of the obtained molded article is also improved. The amount of the elastomer added is such that the viscosity of the reaction solution at 30 ° C. is 5 cps or more, preferably 50 cps.
cps or more and 1000 cps or less, preferably 50
It is appropriately selected so as to be 0 cps or less.

These additives may be preliminarily mixed with one or both of the reaction stock solutions, or may be put in a mold cavity.

(Unreacted solution) As the unreacted solution used in the present embodiment, a norbornene-based monomer, a metathesis catalyst, an activator, an activity regulator and optional components prepared by dividing into two or more solutions are used. . These reaction stock solutions do not undergo bulk polymerization with only one solution, but when all the solutions are mixed, each component has a predetermined ratio, and the norbornene-based monomer undergoes bulk polymerization.

For example, a liquid composed of a norbornene monomer, a metathesis catalyst, and an optional component, and a liquid composed of a norbornene monomer, an activator, an activity regulator, and an optional component are not polymerized as they are. If the total amount of each component contained in the two liquids is the used amount of each component in the present embodiment, each of the two liquids is a reaction stock solution used in the present embodiment, and when both are mixed, they react and undergo bulk polymerization.

For good workability, bulk polymerization is usually carried out using two reaction stock solutions, but three or more reaction stock solutions may be used. In order to allow other components to be sufficiently diffused into the norbornene-based monomer after mixing of the reaction stock solution, all the reaction stock solutions usually contain a norbornene-based monomer, and the other components are composed of a norbornene-based monomer. It is preferable that the monomer is dissolved or dispersed in the monomer, but a reaction stock solution containing no norbornene-based monomer may be present. In addition, since the bulk polymerization starts when the norbornene-based monomer, the metathesis catalyst, and the activator are contained in one reaction stock solution, the metathesis catalyst and the activator are not usually contained in one reaction stock solution. .

The reaction stock solution is usually preferably carried out in an atmosphere of an inert gas such as nitrogen gas for the purpose of preventing deactivation of the metathesis catalyst and the like.

(Lump polymerization) In the present embodiment, FIG.
The winding coil 10 and the reinforcing material for reinforcement are arranged at predetermined positions in the mold shown in FIG. 3, and in the space between the inner surface of the mold and the winding coil,
As described above, a reaction solution obtained by mixing two or more reaction stock solutions is injected.

In the present embodiment, as a method of mixing the undiluted reaction solutions, a method of instantaneously mixing them with a mixing head is generally used. In this case, the containers containing the undiluted solutions serve as separate flow supply sources. As the mixing head, a low-pressure injector such as a collision mixer, a dynamic mixer or a static mixer can be used. In the case of using a combination of reaction stock solutions having a pot life at room temperature of several minutes or less for the purpose of suppressing stickiness of the molded body, the time from mixing of the reaction stock solution to completion of filling into the mold is long. It is preferable to use a collision mixing apparatus since the bulk polymerization may be completed before the filling is completed and a molded article having a predetermined shape may not be obtained. In contrast, when using a combination of reaction stock solutions that form a mixed solution having a pot life of several minutes or more at room temperature, after mixing the reaction solutions,
The injection or injection may be performed several times into the preheated mold, or the injection may be performed continuously, so that the apparatus can be light-weighted, can be operated at a low pressure, and can be large-sized or A thick molded body can be manufactured. Further, when the filling amount of the filler such as glass fiber is large, it is desirable to use a low-pressure injecting machine capable of uniformly filling the reaction solution in the mold by reducing the injecting speed.

In the above-mentioned RIM step, in order to avoid problems such as deactivation of the catalyst, the inside of the mold can be made to have an inert atmosphere by purging an inert gas such as N ₂ . Further, when a filler, a fiber reinforcing material, or the like is filled, if it contains adsorbed water, the adsorbed water may be removed by drying in advance.

In the reaction injection molding, the temperature of the dies 2 and 3 is preferably 10 to 150 ° C., more preferably 3 to 150 ° C.
The temperature is 0 to 120C, more preferably 50 to 100C. The mold clamping pressure of the molds 2 and 3 is usually 0 to 100 kg / c.
m ² . The polymerization time may be appropriately selected, but is usually 30 seconds to 20 minutes, preferably 5 minutes or less after the completion of the injection of the reaction solution.

In the present embodiment, a panel 30 (see FIG. 2) with a built-in winding coil as a reaction injection molded body in which the winding coil 10 is integrated can be obtained by the above reaction injection molding. The wound coil built-in panel 30 can be suitably used as a magnetic levitation type ground coil for a railway.

In the method of this embodiment, not only the dies 2 and 3 but also the coil 10 inserted into the dies 2 and 3 are heated during the reaction injection molding. The reaction at the part in contact with
0 and the resin have good adhesion. In addition, even after the molds 2 and 3 are closed, the wound coil 10 can be heated, so that a reaction injection molded body of a constant quality can always be obtained. Furthermore, in the present embodiment, since the winding coil 10 is heated in a non-contact manner, even if the winding coil 10 is completely embedded in the inside of the molding, the winding coil 10 is heated. Good adhesion to the resin can be maintained.

It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified within the scope of the present invention.

[0065]

EXAMPLES Hereinafter, the present invention will be described based on examples that further embody the present invention, in comparison with comparative examples. However, the present invention is not limited to these examples. In the following Examples and Comparative Examples, parts and percentages are by weight unless otherwise specified.

Comparative Example 1 The size of the cavity was 876 mm × 982 mm × 50.
A mold made of cut aluminum having a diameter of 0.1 mm was prepared. A winding coil was arranged inside the mold, and the mold was closed. As the wound coil, a coil composed of a rectangular aluminum wire having a width of 8.5 mm and a thickness of 6.2 mm was used.
The wire is wound into a rectangular shape with a winding shape of 273 mm wide and 263 mm long with 24 turns, and the two layers are stacked.
Unit coils obtained by stacking two sets with a gap of 0.5 mm were connected in a figure eight shape to form a wound coil.

As shown in FIG. 1, the winding coil 10 thus obtained was arranged so as to completely enter the dies 2 and 3 as shown in FIG. However, the terminal 34 of the coil 10 was attached to the mold so as to be exposed outside the mold.

In the reaction injection molding, first, the lower mold 2
The winding coil 10 was arranged between the upper die 3 and the upper die 3, and a gap was provided between the winding coil 10 and the inner peripheral surface of the die with a spacer or the like. Before placing the winding coil 10 in the mold, the winding coil 10 was heated to about 50 ° C. in an oven or the like.

In the reaction injection molding, 90% of dicyclopentadiene (DCP) and 1% of tricyclopentadiene
3% of vinyl norbornene is added to a norbornene-based monomer composed of 0% and placed in two containers, one of which contains diethyl aluminum chloride (DEAC) for 40% of the monomer.
Molar concentration, 1,3-dichloro-2-propanol (dc
(PrOH) was added to a concentration of 48 mol (A
liquid). On the other hand, tri (tridecyl) ammonium molybdate was added to the monomer at a concentration of 10 mmol (solution B). These A liquid and B liquid were stored in A tank and B tank, respectively.

The temperature of the mold is set to 80 ° C. by flowing hot water through the temperature control pipe mounted inside the mold, and the same volumes of the solution A and the solution B are placed in the cavity of the mold. After about 5 minutes had elapsed after mixing and pouring, the reaction injection molded body in which the coil was integrated was taken out of the mold.

When the molded body was cut and the portion in contact with the wound coil was observed, it was found that the liquid mixture remained unreacted.

[0072] The addition method shown below in Example 1, in the same manner as in Comparative Example 1 was molded shaped bodies winding coils are integrated.

Before the coil was placed in a mold composed of a reaction injection molded article of dicyclopentadiene, the coil was heated to 50 ° C. by an oven. Thereafter, the winding coil was placed in the mold, the mold was closed, and a high-frequency magnetic field was applied to the whole of the winding coil by a high-frequency magnetic field generator arranged outside the mold to perform electromagnetic induction heating. This electromagnetic induction heating was performed until before the cooling step in the reaction injection molding.

The obtained molded body was cut, and the adhered surface between the wound coil and the resin was observed. As a result, it was confirmed that the resin was cured well and adhered well.

[0075]

As described above, in the method of manufacturing a reaction injection body with a built-in winding coil according to the present invention, not only the mold but also the winding coil inserted into the mold during the reaction injection molding. Therefore, the reaction at the portion in contact with the winding coil proceeds well, and the adhesion between the winding coil and the resin is improved. Further, even after the mold is closed, the wound coil can be heated, so that a reaction injection molded article of a constant quality can be always obtained. Further, in the present invention,
Since the winding coil is heated in a non-contact manner, even if the winding coil is completely embedded inside the molding, good adhesion between the winding coil and the resin is maintained. Can be.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a method for manufacturing a reaction injection molded article with a built-in winding coil according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an example of a reaction injection molded article with a built-in winding coil obtained by the method of the present invention.

[Explanation of symbols]

 2 ... Lower mold 3 ... Upper mold 4 ... Cavity 10 ... Winding coil 20 ... High frequency magnetic field generator 30 ... Winding coil built-in panel 34 ... Terminal

Continued on the front page (72) Inventor Masao Suzuki 2-8-3 Hikaricho, Kokubunji-shi, Tokyo Inside the Railway Technical Research Institute (72) Inventor Takeshi Ken Fujimoto 2-8-3 Hikaricho, Kokubunji-shi, Tokyo 38 Railway Company Within the Research Institute of Technology

Claims (1)

[Claims] 1. A coil is disposed inside a mold, and in a state in which the mold is closed, the coil is reactively injection-molded in a cavity of the mold while electromagnetically heating the coil from outside the mold. For producing a reaction injection molded article with a built-in winding coil.