JP2001279060A - Resin composition, molding equipment using the same, and method of manufacturing molding equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an invention for comprehensive environmental consideration of a mold insulating device, and particularly to an invention relating to a mold resin composition and an invention relating to a structure of a device. The issue is how to maintain the basic performance of the mold resin while also reducing the time required for gelling during the curing process and environmentally friendly flame retardation. SOLUTION: A resin composition in which a filler is mixed into a mold resin at a high concentration and magnesium hydroxide is mixed in a part of the resin is used. As an electric element, an inner peripheral portion and an outer peripheral portion are made wider than ends of the electric element, A resin-molded electric device in which a resin is molded in a concave portion formed of the material and an end face of the electric element.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a molding resin composition for electric equipment and a molding equipment.

[0002]

2. Description of the Related Art FIG. 6 is a partially cutaway schematic view of a transformer in which a conventional molded coil is incorporated in an iron core. Here, 32 is an elementary coil of a low voltage coil (S coil), 33
Is a mold resin. As the resin, a resin composition such as epoxy resin, polyester resin,
4 is an elementary coil of a high voltage coil (P coil), and 35 is a mold resin. As this resin, an epoxy resin, a polyester resin, an elethan resin, or the like is used. Silica powder is mainly used at about 50 to 60 wt% as a filler.

[0003] As for the low voltage coil, an end mold insulation system is also employed as in the case of the low voltage coil. However, as for the high voltage coil, a structure in which the entire coil is entirely covered like the high voltage coil is mainly used. The above-mentioned composition occupies the mainstream as a resin.

[0004]

In such a molded coil of an electromagnetic device and its molding resin composition, comprehensive environmental measures including a single material, a product, and a manufacturing process of the product are required. The resin composition has insufficient flame retardancy, so measures such as adding a halogen-based flame retardant have been taken.Therefore, there are environmental issues, and as for the coil structure, a strong resin Because of the structure covering the whole, the decomposability for separating the mold resin from the conductor and other materials was poor, and the recyclability, which is an environmental evaluation index, was very poor.

[0005] It is an object of the present invention to provide an environment-friendly mold resin and a mold coil which can improve the flame retardancy of the mold resin in an environmentally friendly manner and improve the recyclability of the mold coil.

[0006]

SUMMARY OF THE INVENTION In order to solve this problem, the present invention relates to a molding resin composition in which a filler is mixed in a resin component in an amount of 68 to 76% by weight and the composition of the filler is 70 to 70% by weight. 5% by weight and 5 to 30% by weight of magnesium hydroxide, and the present invention projects the inner and outer periphery of the electric element from the end of the element. By injecting the molding resin into the recess formed by the material and gelling at a high temperature, no toxic gas is generated when the molding resin is burned, and since the coil has a simple structure, the decomposability is improved. In addition, the recycling rate is improved, and the effect of the mold resin filled in the mold coil is gelled at high temperature and high speed, so that the energy of the curing process is small and the manufacturing process is low. Time also reduced the overall environmental considerations.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION
A polyfunctional monomer, a polyfunctional curing agent capable of reacting therewith or a resin composition containing a crosslinkable monomer and a crosslinker as essential components are mixed with an inorganic filler in an amount of 64 to 76% by weight, and the inorganic filler is It is a resin composition for mold equipment composed of 70 to 95% by weight of silica powder and 5 to 30% by weight of magnesium hydroxide. As a resin composition, a resin component, that is, a combustible material is small and water is decomposed during combustion by magnesium hydroxide. Generates and suppresses the combustion of resin and exhibits flame retardancy. Also, when the resin component is small, the heat of reaction generated by the curing reaction is small, and the heat generation temperature is also low.

[0008] The invention described in claim 2 of the present invention is claimed in claim 1.
Or in addition to the invention of 2, the polyfunctional monomer is predominantly a diepoxide and the curing agent is predominantly an acid anhydride, and 0.5 to 2.0 parts of a tertiary amine is further added to 100 parts of the polyfunctional monomer. It is a mixed resin composition, has small curing shrinkage during curing, has excellent mechanical properties, and is easy to mix a filler. In particular, it is excellent in mixing with magnesium hydroxide. Further, the heat of reaction during curing is relatively small, and the temperature rise due to heat generated by the curing reaction is small.

The invention according to claim 3 of the present invention is a resin characterized in that the surface of the magnesium hydroxide powder is subjected to silane treatment in addition to the invention according to claim 1 or 2, By performing the treatment, it is possible to suppress an increase in the viscosity of the resin composition, and it is possible to improve the mixing ratio of the inorganic filler as a whole system.

According to a fourth aspect of the present invention, the inner peripheral surface and the outer peripheral surface of the electric element protrude from the end face of the electric element,
A resin filled in a concave portion formed by the inner peripheral material and the outer peripheral material and an element end face is a molded insulating coil which is the resin composition according to claim 1, wherein the resin composition as described above is used. By filling the end of the element, it is possible to obtain a mold coil that is resistant to heat cycles, excellent in mechanical properties, and excellent in flame retardancy.Furthermore, it generates heat during the curing process after injecting the resin composition into the end. The size can be reduced, and the gelation temperature can be increased and the reaction can be performed in a short time.

According to a fifth aspect of the present invention, the outer peripheral portion of the electric element is made to protrude with an insulating material, and the resin filling the recess formed by the outer peripheral material and the end face of the electric element is filled in the first, second or third aspect. This is a molded insulating capacitor with a resin composition of 1.The filling of the end faces of electrical elements with the resin composition as described above makes it possible to obtain a molded capacitor that is resistant to heat cycles, excellent in mechanical properties and flame retardancy. Furthermore, heat generation during the curing process after the resin composition is injected into the end face portion can be reduced, and the gelation temperature can be increased and the reaction can be performed in a short time.

The invention according to claim 6 of the present invention is characterized in that the polyfunctional monomer is predominantly a diepoxide and the curing agent is predominantly an acid anhydride.
2.0 parts of a tertiary amine is mixed, and an electric device is resin-molded with a resin composition in which 68 to 76% by weight of an inorganic filler is mixed in a resin containing them as an essential component, and the gelling temperature is 90 ° C or higher. A method for manufacturing a mold device, characterized in that the resin composition has a low heat of reaction and a small curing strain due to a curing reaction, so that it is possible to employ a temperature higher than a gelling temperature which is usually performed because of a short reaction time. The curing process can be performed in a short curing time, and an environment-friendly curing system can be realized.

An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is an example of a cross section of a resin mold coil according to an embodiment of the present invention. Reference numeral 1 denotes a sheet material made of a fibrous fabric supporting a prepreg resin, and examples of the prepreg resin include an epoxy resin, an unsaturated polyester resin, and a phenol resin. Examples of the fibrous woven fabric include glass cloth, polyester fiber woven fabric, and aromatic fiber woven fabric. Reference numeral 2 denotes a sheet material made of a fibrous non-woven fabric carrying a prepreg resin, and the type of the prepreg resin can be the same as that described above. Examples of the fibrous nonwoven fabric include a glass fiber nonwoven fabric, a polyester nonwoven fabric, and an aromatic fiber nonwoven fabric. Further, the same object can be achieved by using a sheet-like material in which a prepreg resin layer is adhered to one or both surfaces of a plastic film instead of the above-mentioned material. Further, it is possible to strengthen the insulation by partially reducing the width of the material on the element coil side of the inner peripheral material and covering the resin layer at the end of the material. Reference numeral 3 denotes a sheet-like conductor made of a metal sheet such as aluminum or copper. Here, it is possible to use a round wire, a flat wire, or the like, which is conventionally used as a conductor, instead of a sheet shape.
Reference numeral 4 denotes an interlayer insulating material made of a sheet material. Specifically, it is made of a plastic film such as polyethylene terephthalate, polyethylene naphthalate, polyphenylsulfone, polysulfone, polyimide, or polyamideimide, an aromatic polyamide insulating paper, a cellulosic insulating paper, or the like. It is also possible to use a material having a prepreg resin coated on the surface thereof.

Reference numeral 5 denotes a sheet material made of a fibrous woven fabric carrying a prepreg resin, the contents of which are the same as those described in the above item 1. Reference numeral 6 denotes a sheet material made of a fibrous non-woven fabric carrying a prepreg resin, and has the same contents as in the above-mentioned item 2.
7 is a mold resin which is an epoxy resin as a resin type.
Polyester resin, urethane resin, silicon resin and the like are used. As the filler, a mixture of silica powder and magnesium hydroxide as an environmentally friendly method is used.
The content of the filler is 64 to 76% by weight, and the content of magnesium hydroxide is 5 to 5% of the total amount of the filler.
30 weight percent.

This composition can satisfy flame retardancy, mechanical properties and electrical insulation properties. However, when the gelation temperature during curing is increased, for example, at 90 ° C. or higher, the fillers 68 to 7 are used.
It must be 6 weight percent. In addition, an epoxy resin is used as a resin and an acid anhydride is used as a curing agent, and 0.5 to 2.
A resin composition excellent in mixing 0 parts can be obtained. Diepoxides of various molecular weights are commercially available, but those having an average molecular weight of about 400 or less can be mixed with the filler, and the workability gradually deteriorates as the average molecular weight increases. Has to be gradually reduced.

When magnesium hydroxide used as a part of the filler is mixed alone, the workability at the time of mixing becomes very poor, and such a problem can be solved by subjecting the surface to silane treatment. By mixing magnesium hydroxide into silica powder, abrasion of the stirrer during mixing with silica alone was a problem, but that problem is also solved.

FIG. 2 is a schematic sectional view of a resin molded capacitor according to the present invention. In the figure, the same numbers as those in FIG. 1 indicate the same materials. In the figure, reference numeral 11 denotes a dielectric material made of a sheet material. Specifically, materials such as polyethylene terephthalate, polypropylene, polycarbonate, polysulfone, and polystyrene are used. Reference numeral 12 denotes a vapor-deposited film formed on a dielectric, which constitutes a counter electrode of the capacitor. Aluminum, zinc and other metals are used as the material. Reference numeral 13 denotes a gap portion, and reference numeral 14 denotes a metallikon layer for leading out an electrode. Generally, zinc is used. Reference numeral 15 denotes a lead wire for connecting to a circuit. Here, the reason why the outer insulating layer is formed in a step shape is to improve the insulating performance by covering a part of the outer peripheral material with the mold resin. Normal insulation performance can be obtained even if it is not stepped. The same effect can be obtained when the outer peripheral material is made of a cylindrical plastic material. Further, the same effect can be obtained by a method of filling the resin after storing the capacitor element in the plastic case. That is, even if only one end surface of the electric element is molded with the resin according to the present invention, the above-described effects can be obtained.

[0019]

Next, an embodiment of the present invention will be described. FIG. 1 is a partial schematic cross-sectional view of a resin mold coil according to the present invention. Glass fiber woven fabric carrying epoxy prepreg resin as fibrous fabric carrying prepreg resin, glass fiber nonwoven fabric carrying epoxy prepreg resin as fibrous nonwoven fabric carrying prepreg resin, aluminum sheet as conductor, interlayer insulating material As the molding resin, the main component is diepoxide and the epoxy equivalent is 187.
A mold resin prepared by mixing silica powder and magnesium hydroxide powder in a composition containing an acid anhydride as a curing agent and a tertiary amine as a reaction accelerator as shown in Table 1 is filled in each coil, and the transformer is formed. Table 1 shows the results obtained by measuring the characteristics of each of the prepared samples.

[0020]

[Table 1]

In Table 1, flammability, cracks and peeling are the filling characteristics of the present invention. Comparative Example 1 is a case where silica powder is mixed as a filler by 62% by weight, which is a resin composition which is generally widely used. However, with this composition, the exothermic temperature is high and the initial effect at a high temperature is impossible. It is necessary to perform long-time initial curing at a medium temperature or a low temperature and consider cracks and peeling. In addition, the flame retardancy is inferior because the resin content is large and no flame retardant is contained. Therefore, in order to impart flame retardancy, bromine-based flame retardants and the like have been mixed. In addition, cracking and peeling of molded products are inferior due to large curing shrinkage. Further, the abrasion of the mixer during resin mixing is inferior because the filler is silica powder alone.

In fact 1, the amount of silica powder mixed was 64% by weight, and the exothermic temperature was lower than that of Comparative Example 1, but was inferior in flame retardancy, cracks, and peeling. Even worse.

In the case of Example 2, although the amount of silica powder mixed was 64% by weight, 5% by weight of the filler was replaced with magnesium hydroxide. Therefore, the flame retardancy was excellent, and the abrasion of the mixer during mixing was also reduced. Few.

Example 3 is a case where the amount of the filler is 64% by weight and 30% by weight of the filler is replaced by magnesium hydroxide, as in the case described above. Is more excellent than the above-mentioned composition. But cracks and peels are inferior. In order to prevent the occurrence of cracks and peeling, it is necessary to carry out a long initial curing treatment at a low and medium temperature as in the conventional case. Regarding the abrasion of the mixer during mixing, the effect of magnesium hydroxide is excellent.

Comparative Example 2 is a resin composition containing 66% by weight of a filler, and has a relatively low heat generation temperature, but is inferior in flammability. It is also excellent in terms of cracks and peeling. The abrasion of the mixer during mixing is large because it does not contain magnesium hydroxide.

Actually, No. 4 is a resin composition in which 5% by weight of the filler is replaced with magnesium hydroxide in 66% by weight of the filler, and is excellent in flame retardancy and abrasion of the mixer during mixing.

Fruit 5 has a composition in which 15% by weight of the filler is replaced by magnesium hydroxide, and the flame retardancy is improved as compared with Fruit 4.

Example 6 is a case in which 30% by weight of the filler was replaced with magnesium hydroxide, and is superior to Example 5 in flame retardancy.

Example 7 shows a case where 68% by weight of silica powder was mixed as a filler, and although the abrasion of the mixer during mixing was inferior, other characteristics were excellent.

Example 8 is a case where 70% by weight of silica powder is mixed as a filler, and has excellent performance except for abrasion of the mixer.

Actually, No. 9 shows a resin composition in which 74% by weight of a filler is mixed. The resin composition is inferior in wear of the resin mixer, but is excellent in other characteristics.

The composition No. 10 has 74% by weight of the filler and 5% by weight of the filler is composed of magnesium hydroxide.

[0033] In fact, the filler 11 contains 74% by weight of the filler, and 30% by weight of the filler is a resin composition composed of magnesium hydroxide, the workability of which is slightly lowered, but other characteristics are excellent.

Actually, No. 12 is a case where the amount of the filler mixed is 76% by weight and the whole amount is silica powder, and the viscosity is increased and the workability is slightly deteriorated. Further, since the silica powder is used alone, wear of the mixer increases. In the examples, silica powder and magnesium hydroxide are described as fillers, but the same effect can be expected even if fillers other than silica powder are slightly mixed.

[0035]

The mold device of the present invention is not only a mechanical characteristic and an electrical insulation characteristic but also an environmentally friendly flame-retardant method. Further, it is possible to construct an energy-saving manufacturing system with a short heating time in the curing process of the mold resin. It becomes possible.

That is, according to the first aspect of the present invention, abrasion of the stirrer at the time of mixing the mold resin is small,
It is excellent in workability during molding work, generates little heat during curing of the mold resin, is excellent in flammability and is environmentally friendly, and does not cause mold coil peeling or cracking.

According to the second aspect of the present invention, the mechanical properties and electrical insulation properties of the mold resin are excellent, and the heat resistance can be used up to the class F class. The problem is unlikely to occur.

According to the third aspect of the present invention, by treating the surface of the magnesium hydroxide as the filler with silane, it is possible to suppress an increase in viscosity, and the injection work of the mold resin becomes easy. Become.

According to the fourth aspect of the present invention, by molding the end face of the coil with the resin having the resin composition, heat generation during curing of the molding resin is small, and there is no crack or peeling due to thermal stress, and the molding is performed. The resin layer is flame retarded in an environmentally friendly manner.

According to the invention of claim 5 of the present invention, by molding the end face of the capacitor element with the resin having the resin composition, heat generation at the time of curing the molding resin is small, and there is no crack or peeling due to thermal stress, and The mold resin layer is flame retarded in an environmentally friendly manner.

According to the invention of claim 6 of the present invention, the mechanical properties and electrical insulation properties of the mold resin are excellent, the heat resistance can be used up to class F, and the gelling temperature after resin molding is increased. In addition, since the process can be performed in a short time, the manufacturing lead time can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a partial schematic cross-sectional view of a resin mold coil according to the present invention.

FIG. 2 is a schematic sectional view of a resin molded capacitor according to the present invention.

FIG. 3 is a partially cut-away schematic cross-sectional view of a coil portion of a molded transformer equipped with a conventional molded coil.

[Description of Signs] 1, 5 Sheet material made of fibrous woven fabric carrying prepreg resin 2, 6 Sheet material made of fibrous nonwoven fabric carrying prepreg resin 3 Sheet-shaped coil conductor 4 Interlayer insulating material 7 Mold resin DESCRIPTION OF SYMBOLS 11 Dielectric 12 Vapor deposition film 13 Void 14 Metallicon 15 Lead wire

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01F 27/32 H01F 27/32 Z A 41/12 41/12 B H01G 4/18 H01G 4/24 301K 311 (72) Inventor Motomasa Haraguchi 1006 Kadoma, Kazuma, Osaka Pref.F-term in Matsushita Electric Industrial Co., Ltd. 5E082 AA06 BC23 BC33 BC35 BC40 EE07 EE23 EE24 EE25 EE37 FF05 FG06 FG34 FG35 FG36 GG04 HH28 HH43 HH47 HH51 JJ12 JJ22 PP03

Claims (6)

[Claims] 1. A polyfunctional monomer and a polyfunctional curing agent capable of reacting with the polyfunctional monomer, or a resin composition containing a monomer crosslinkable with the monomer and a crosslinking agent as essential components, comprising 64 to 76% by weight of an inorganic filler. A resin composition for a molding device, wherein the inorganic filler is mixed with 70 to 95% by weight of silica powder and 5 to 30% by weight of magnesium hydroxide. 2. The method according to claim 1, wherein the polyfunctional monomer is diepoxide, the curing agent is an acid anhydride, and 0.5 to 2.0 parts of a tertiary amine are mixed with 100 parts of the polyfunctional monomer. Resin composition. 3. The resin composition according to claim 1, wherein the surface of the magnesium hydroxide is surface-treated with silane. 4. The resin composition as claimed in claim 1, wherein the inner peripheral surface and the outer peripheral surface of the electric element have end portions protruding from the end surface and filled in a recess formed by the inner peripheral material and the outer peripheral material. There is a mold insulation coil. 5. A molded insulated capacitor having a resin composition according to claim 1, wherein the resin is filled in a recess formed by the outer peripheral member and the end of the electric element. . 6. The polyfunctional monomer is diepoxide,
A resin composition in which a curing agent is an acid anhydride, and a resin containing 0.5 to 2 parts of a tertiary amine as an essential component with respect to 100 parts of a polyfunctional monomer, and 68 to 76% by weight of an inorganic filler is mixed. Electric equipment is molded with resin and gel temperature is 9
A method of manufacturing a mold device at 0 ° C. or higher.