JPH1095904A - Mold material and mold motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject material easily disposable as a waste by using a composition composed of an unsaturated polyester, an addition-polymerizable monomer and a specific aliphatic polyester as a binder. SOLUTION: This mold material contains a binder consisting of a thermosetting composition composed of (A) an unsaturated polyester (preferably a copolymer of isophthalic acid, fumaric acid and neopentyl glycol, etc.), (B) an addition polymerizable monomer (preferably selected from styrene, 2hydroxyethyl acrylate and 2-hydroxyethyl methacrylate) and (C) an aliphatic polyester selected from polydipropylene succinate, polyethylene malonate, polypropylene malonate, polydipropylene malonate, polyethylene pimelate, polypropylene pimelate and polydipropylene pimelate. The objective material is easily decomposable with a decomposition liquid composed of a base and a solvolytic solvent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding material excellent in strength and heat resistance and easy to dispose after use, and to a molding motor using the molding material.

[0002]

2. Description of the Related Art Thermosetting resins having an unsaturated polyester and an addition-polymerizable monomer as a skeleton are sometimes used alone, but most of them are used as composite materials, and about 80% of the production is fiber reinforced. Used as plastic (FRP). Filling materials such as inorganic materials, additives, and easy to strengthen by fiber, molding materials, laminates, adhesives,
Applied to paints, etc. On the other hand, these resins are three-dimensionalized by a curing reaction and generally become insoluble and infusible solids.
Conventionally, it has been difficult to disassemble, and has been discarded because it is difficult to regenerate and reuse.

[0003] The molding material is a molding material in which a resin as a binder is filled with an inorganic material such as glass fiber, calcium carbonate, talc or silica, or an organic material such as pulp or wood. Such a filling results in a material having a large specific strength and specific rigidity, and thus is applied to various uses in the industrial field and the consumer field. However, since the molding material is a composite material, it is generally difficult to recycle it after use. Furthermore, if the binder resin is a thermosetting resin,
Since it is made three-dimensional by a curing reaction and generally becomes an insoluble and infusible solid, it has conventionally been difficult to decompose it, and it has been the only way to discard it because it is not suitable for regeneration treatment and reuse. In recent years, as the issue of waste has gained attention,
Technology development for reuse and recycling is required, and the use of raw materials by thermal decomposition has begun to be considered. The advantages of the thermosetting resin and the mold material, such as hardness, strength, heat resistance, flame retardancy, and chemical resistance, make waste disposal technically difficult.

On the other hand, equipment to which a molding material using a thermosetting resin as a binder, such as a mold motor, is used for consumer equipment, industrial equipment, office equipment, and the like. Such a molded motor has a quietness, a vibration damping property, an insulating property,
Demand is rapidly expanding because of its excellent maintainability, compactness, and easy automation during manufacturing. 2. Description of the Related Art Conventionally, a molded stator of a molded motor used as an AC motor, a brushless DC motor, or the like generally has a configuration disclosed in, for example, Japanese Patent Application Laid-Open No. 61-214740. The configuration will be described with reference to FIGS.

FIG. 2 is a perspective view showing an external appearance of a molded motor having a conventional molded stator 201, and FIG. 3 is a perspective view showing a configuration of a stator portion before being molded. As shown in FIG.
20 and a molded stator 201 integrally formed so as to cover the stator portion of FIG. As shown in FIG. 3, the stator portion has an iron core 204 on which a winding 203 is wound via a cylindrical insulator 207, and the insulator 207 is provided on a part of one of its circumferential portions. A printed circuit board 211 having a wiring pattern 210 is provided. The terminal of the winding and the lead wire 212 are connected on the printed board 211, and a signal from the outside is input. This mold material, as a binder material, polyethylene terephthalate, polyethylene, polypropylene,
It contains a thermoplastic resin such as nylon or a thermosetting resin such as unsaturated polyester, vinyl ester resin or phenol resin, and further contains calcium carbonate, talc, carbon black or the like as an additive.

[0006] The problem of waste has become more and more serious, and development of techniques for reducing the volume of discarded thermosetting compositions or molded material molded articles and processing techniques for reuse has been urgent. In particular, unsaturated polyester resin reinforced with fiber
Since it is frequently used in the production of large products such as fishing boats, tanks, and housing equipment, the decomposition and recycling of waste is serious. In addition, many molding materials using a thermosetting resin as a binder are often used as structural materials due to their strength and the like, and often include other materials such as metals. The fact that metals and the like are valuable materials more expensive than resin materials and hinders the possibility of recycling and reuse thereof has become a bigger problem.
That is, at present, the problem of waste cannot be solved by the conventional configuration and processing method for the molding material.

On the other hand, when the molded motor is discarded, it is desirable to remove the molding material and to recycle the valuable metal such as iron cores and windings. In conventional general waste treatment, a valuable material is recycled by first crushing a mold material with a shredder and then sorting valuable materials such as an iron core and a winding from the crushed material. But,
In the molded motor having the above-described configuration, the shredder teeth are easily damaged by the iron core or the windings. Therefore, the crushing process is avoided, and valuable resources are discarded without being recycled, and are buried together with other waste. Since the above mold materials do not naturally decompose due to landfill, silicon steel plates and copper wires used for iron cores and windings have high value as materials even after use as motors. Regardless, it is left unfilled without being recycled.
Further, a conventional decomposition treatment method such as the above-described volume reduction by thermal decomposition cannot be applied to a thermosetting resin used as a molding material. Therefore, in the conventional mold motor, neither crushing nor disassembly of the molding material can be applied, and there is a problem that it is difficult to reuse valuable materials such as iron cores and windings at the time of disposal.

[0008]

SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide a mold material which can be easily disposed of when disposed. Another object of the present invention is to provide a mold motor that can be easily disassembled.

[0009]

In order to achieve the above object, a first molding material of the present invention comprises a thermosetting composition comprising at least an unsaturated polyester, an addition polymerizable monomer, and an aliphatic polyester as a binder. Wherein the aliphatic polyester is selected from the group consisting of polydipropylene succinate, polyethylene malonate, polypropylene malonate, polydipropylene malonate, polyethylene pimerate, polypropylene pimerate, and polydipropylene pimerate. At least one. In the above molding material, it is desirable that the addition polymerizable monomer is one or more selected from the group consisting of styrene, 2-hydroxyethyl acrylate, and 2-hydroxyethyl methacrylate.

[0010] The second molding material of the present invention contains, as a binder, a thermosetting composition comprising at least an unsaturated polyester, an addition-polymerizable monomer, and a low-shrinkage agent, and the addition-polymerizable monomer contains at least 2- At least one selected from the group consisting of polypropylene adipate, polydipropylene adipate, polypropylene succinate, polydipropylene succinate, polypropylene phthalate, and polydipropylene phthalate, comprising hydroxyethyl acrylate or 2-hydroxyethyl methacrylate; Is a seed. In the above molding material, the addition polymerizable monomer may further contain styrene. The molded motor of the present invention,
The above-mentioned molding material has a configuration covering at least a part of the iron core and the winding.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In the molding material of the present invention, an unsaturated polyester used as a binder can be obtained by polycondensation of an unsaturated polybasic acid and a saturated polybasic acid with glycols by a known method. Examples of the unsaturated polybasic acid include maleic anhydride, fumaric acid, itaconic acid, citraconic acid and the like. Examples of the saturated polybasic acids include phthalic anhydride, isophthalic acid, terephthalic acid, adipic acid, sebacic acid, tetrahydrophthalic anhydride, methyltetrahydrophthalic anhydride, endmethylenetetrahydrophthalic anhydride, heptic acid, and tetrabromophthalic anhydride. No. Glycols include ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, neopentyl glycol, 1,3-butanediol, 1,6-hexanediol, hydrogenated bisphenol A, bisphenol A propylene oxide compound, dibromoneopentyl Glycol and the like. Suitable unsaturated polyesters include copolymers of isophthalic acid and fumaric acid with neopentyl glycol represented by the following formula (1), and phthalic anhydride and anhydride represented by the formula (2) A copolymer of fumaric acid and propylene glycol, a copolymer of isophthalic acid and maleic anhydride and propylene glycol represented by the formula (3), and the like can be given.

[0012]

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In the above formula, n ^{1 to} n ³ are each independently 1 to 30. The crosslinking agent for the unsaturated polyester used in the binder of the first molding material of the present invention includes:
One or more addition polymerizable monomers selected from the group consisting of 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, and styrene are used. An addition polymerizable monomer containing 2-hydroxyethyl acrylate or 2-hydroxyethyl methacrylate is used as a crosslinking agent for the unsaturated polyester used as the binder of the second molding material of the present invention. Further, styrene can be contained as an addition polymerizable monomer in the binder of the second mold material of the present invention. In addition, as the addition polymerizable monomer, vinyl acetate, methyl methacrylate, vinyl toluene, α-methylstyrene, diallyl phthalate, diallyl isophthalate, diallyl tetrabromophthalate, phenoxyethyl acrylate, and the like can be used in combination. The addition polymerizable monomer is contained in an amount of preferably 25 to 150 parts by weight, more preferably 40 to 100 parts by weight, based on 100 parts by weight of the unsaturated polyester.

The low-shrinkage agent used in the second mold material of the present invention is a polypropylene adipate represented by the formula (4), a polydipropylene adipate represented by the formula (5), or a formula (6). Polypropylene phthalate,
And at least one selected from the group consisting of polydipropylephthalate represented by the formula (7).

[0015]

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In the above formula, n is 10 to 2000. The low-shrinkage agent used in the first molding material of the present invention is polystyrene, polyethylene, polymethyl methacrylate, polyvinyl acetate, butadiene / styrene / methyl methacrylate copolymer (MBS resin), polyhydroxyethyl methacrylate, or ketone resin. And so on. Further, the above-mentioned low shrinkage agent used for the second molding material of the present invention can also be used. The low-shrinkage agent is preferably contained in an amount of 1 to 100 parts by weight, more preferably 2 to 50 parts by weight, based on 100 parts by weight of the unsaturated polyester. The first mold material of the present invention contains an aliphatic polyester. Examples of the aliphatic polyester include polydipropylene succinate represented by the formula (8), polyethylene malonate represented by the formula (9), and formula (10)
, A polydipropylene malonate represented by the formula (11), a polyethylene pimerate represented by the formula (12), a polypropylene pimerate represented by the formula (13), )), And at least one of them is used. These polyesters are easily decomposed by a decomposition solution described below.

[0017]

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[0018]

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In the above formulas (8) to (14), n is 10 to 2000. The aliphatic polyester is preferably contained in an amount of 1 to 100 parts by weight, more preferably 2 to 50 parts by weight, based on 100 parts by weight of the unsaturated polyester. Further, the second molding material of the present invention may also contain the above-mentioned aliphatic polyester contained in the first molding material.

The molding material of the present invention preferably contains a curing agent. Benzoyl peroxide, t
-Butyl perbenzoate, t-butyl peroxybenzoate, t-butyl peroxy laurate, t-butyl peroxy-2-ethylhexanoate, t-butyl peroctoate, 1,1-bis (t-butyl peroxy Oxy)
3,3,5-trimethylcyclohexane, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane and the like. The curing agent is preferably 0.1 to 5 parts by weight based on 100 parts by weight of the unsaturated polyester,
More preferably, it is contained in the range of 0.2 to 4 parts by weight.

The molding material of the present invention may contain a filler, a thickener, a release agent, a wax, a coloring agent, and the like, if necessary. Fillers include carbonates such as calcium carbonate and magnesium carbonate, calcium sulfate, barium sulfate,
(Sulfite) such as calcium sulfite, clay, mica, glass balloon, silicates such as montmorillonite, silicic acid, kaolin, talc, silica, siliceous earth, iron oxide, pumice balloon, titanium oxide, alumina Inorganic fillers such as oxides, hydroxides such as aluminum hydroxide and magnesium hydroxide, graphite, glass fiber, carbon fiber, asbestos fiber; and wood flour, chaff, cotton, paper chips, nylon Fiber, polyethylene fiber,
Examples include organic fillers such as wood, pulp, and cellulose. The filler is added in an amount of preferably 5 to 600 parts by weight, more preferably 20 to 500 parts by weight, based on 100 parts by weight of the thermosetting composition. By adding the filler in such a range, the mechanical strength of the mold material is improved.

Examples of the thickener include beryllium oxide, magnesium oxide, magnesium hydroxide, calcium oxide, calcium hydroxide, zinc oxide, benzoic acid, phthalic anhydride,
Examples include tetrahydrophthalic anhydride and maleic anhydride. Examples of the release agent include stearic acid, zinc stearate, calcium stearate and the like. As the wax, Hoechst wax, carnauba wax,
Paraffin and the like. Examples of the coloring agent include titanium white, chromium oxide, and carbon black.

The solvolytic solvent used in the decomposition treatment of the mold material of the present invention refers to a solvent which itself can act as a nucleophile and cause a substitution reaction, and includes water, methanol, ethanol and ethylene. Glycol, acetic acid, thiol, hydrazine and the like.

A molded motor according to the present invention is constituted by using the above-described molding material. Hereinafter, preferred embodiments of the mold stator of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing one embodiment of a molded motor having a molded stator of the present invention. The molded motor includes a motor unit 10 and a molded stator 11. The mold stator 11 covers the iron core 14 on which the windings 13 are wound via the insulator 12 and the iron core 14 on which the windings 13 are wound, and fills the entire mold stator to be integrated with a molding material. And a molded part 15. The motor section 10 is attached to an opening of the mold section 15 and includes at least a rotor shaft 16 and a rotor 17 attached to the rotor shaft 16, and is supported by a bracket 18. The rotor 17 is supported by a bearing 19 mounted on the upper wall of the opening and a bearing 20 mounted on the bracket 18. Although not shown, the terminal portion of the winding 13 extends to a portion located above the shaft of the mold stator, where it is connected to a lead wire, and external input is possible. Further, the mold stator 11 may include a flange portion 22 having a plurality of mounting holes 21. The thickness of the maximum thickness portion of the mold section 10 is usually about 10 mm. What constitutes the mold section 10 is the above-described mold material of the present invention.

The thickness of the maximum thickness portion of the mold portion can vary depending on the application, but in the present invention, it is preferably 1 to 10 mm, more preferably 1 to 8 mm, and most preferably 1 to 5 mm. As the insulator 12, for example, a thermoplastic resin such as aliphatic polyester, polyethylene terephthalate, or polyethylene is used.
The mold stator of the present invention can be more easily disassembled by appropriately combining the configurations of the preferred embodiments described above. The molded stator of the present invention is applied to a brushless DC motor, an AC motor, a linear motor, and the like.

[0026]

Embodiments of the present invention will be described below. << Example 1 >> Unsaturated polyester (manufactured by Nippon Shokubai Co., Ltd.
Trade name: Epolak) 10.88 parts by weight, 8.73 parts by weight of styrene as an addition polymerizable monomer, and polydipropylene malonate (molecular weight 2) as an aliphatic polyester
1.37 parts by weight, 1.82 parts by weight of polyvinyl acetate as a low-shrinking agent, and a curing agent 1,1-bis (tert)
-Butylperoxy) 3,3,5-trimethylcyclohexane (trade name: Perhexa 3M, manufactured by NOF Corporation)
0.25 parts by weight was added and mixed well to obtain a composition to be a binder. Next, calcium carbonate as a filler 9.
91 parts by weight, 50.8 parts by weight of aluminum hydroxide, 1.24 parts by weight of zinc stearate as a release agent, 0.37 parts by weight of carbon powder as a pigment, and 0.1% by weight of polyethylene.
99 parts by weight were dry mixed in a kneader for about 5 minutes. To the uniformly mixed dry mixture, the binder composition prepared above was gradually added and kneaded to obtain a uniform paste. Next, while dispersing 13.63 parts by weight of glass fibers evenly in this paste-like substance, the glass fibers were added as quickly as possible, and when the glass fibers were wet and uniformly dispersed, kneading was completed to obtain a molding material. .

Example 2 To 10.38 parts by weight of an unsaturated polyester (trade name: Epolak, manufactured by Nippon Shokubai Co., Ltd.), 4.17 parts by weight of styrene as an addition polymerizable monomer, and 2-hydroxyethyl methacrylate 5 .21 parts by weight, 1.31 parts by weight of polydipropylene malonate (molecular weight: 20,000) which is an aliphatic polyester, 1.74 parts by weight of polyvinyl acetate as a low-shrinking agent, and a curing agent 1,1-bis (tert- 0.25 parts by weight of (butylperoxy) 3,3,5-trimethylcyclohexane (trade name: Perhexa 3M, manufactured by NOF CORPORATION) was added and mixed well to obtain a composition to be a binder. Next, 9.91 parts by weight of calcium carbonate as a filler and 50.8 parts of aluminum hydroxide were used.
Parts by weight, 1.24 parts by weight of zinc stearate as a release agent, 0.37 parts by weight of carbon powder as a pigment, and 0.99 parts by weight of polyethylene were dry-mixed in a kneader for about 5 minutes. To the uniformly mixed dry mixture, the binder composition prepared above was gradually added and kneaded to obtain a uniform paste. Next, 13.6 was added to this paste.
While dispersing 3 parts by weight of glass fiber evenly,
Kneading was completed when the glass fibers were wet and uniformly dispersed when possible, and a mold material was obtained.

Example 3 An unsaturated polyester (manufactured by Nippon Shokubai Co., Ltd., trade name: Epolac) was added to 9.93 parts by weight.
9.96 parts by weight of 2-hydroxyethyl methacrylate as an addition polymerizable monomer, 1.25 parts by weight of polydipropylene succinate (molecular weight 30,000) as an aliphatic polyester, and 1.6 of polymethyl methacrylate as a low shrinkage agent
6 parts by weight and a curing agent 1,1-bis (tert-butylperoxy) 3,3,5-trimethylcyclohexane (trade name: Perhexa 3M, manufactured by NOF Corporation) 0.2
5 parts by weight were added and mixed well to obtain a composition to be a binder. Next, 9.91 parts by weight of calcium carbonate as a filler, 50.8 parts by weight of aluminum hydroxide, 1.24 parts by weight of zinc stearate as a release agent, 0.37 parts by weight of carbon powder as a pigment, and 0.99 parts by weight of polyethylene was dry mixed with a kneader for about 5 minutes. To the uniformly mixed dry mixture, the binder composition prepared above was gradually added and kneaded to obtain a uniform paste. Next, while uniformly dispersing 13.63 parts by weight of glass fiber in this paste-like substance, it was added in a short time as possible,
When the glass fibers were wet and uniformly dispersed, kneading was terminated to obtain a molding material.

Comparative Example 1 9.34 parts by weight of an addition polymerizable monomer, styrene, and 1.82 polyvinyl acetate were added to 11.64 parts by weight of an unsaturated polyester (trade name: Epolac, manufactured by Nippon Shokubai Co., Ltd.). Parts by weight, and curing agent 1,
1-bis (tert-butylperoxy) 3,3,5-
0.25 parts by weight of trimethylcyclohexane (trade name: Perhexa 3M, manufactured by NOF CORPORATION) was added and mixed well to obtain a composition to be a binder. Next, 9.91 parts by weight of calcium carbonate as a filler, 50.8 parts by weight of aluminum hydroxide, and 1.2% of zinc stearate as a release agent
4 parts by weight, 0.37 parts by weight of carbon powder as a pigment, and 0.99 parts by weight of polyethylene were dry-mixed in a kneader for about 5 minutes. To the uniformly mixed dry mixture, the binder composition prepared above was gradually added and kneaded to obtain a uniform paste. Next, 1
While dispersing 3.63 parts by weight of glass fiber evenly, it was added in as short a time as possible, and when the glass fiber was wet and uniformly dispersed, kneading was completed to obtain a molding material.
This molding material has a conventional composition.

Each of the molding materials obtained in Examples 1 to 3 and Comparative Example 1 thus obtained is in the form of a bulk.
A type of molding material called C (Bulk Molding Compound), which is in a non-adhesive state despite containing an addition polymerizable monomer. Table 1 summarizes the components of the molding material, which are different from each other, the monomer, the low-shrinkage agent, and the aliphatic polyester. Table 2 shows the basic physical properties measured for these molding materials.

[0031]

[Table 1]

[0032]

[Table 2]

The spiral flow represents the length of the material extruded from the pores (flow length), and is mainly used to determine the formability of transfer molding and injection molding. The measurement was performed at 150 ° C. and 100 kgf / cm ² . The comparative example is a molding material having a conventionally used composition. Since the spiral flow of the example is almost the same as that of the comparative example, it can be seen that there is no problem even if molding is performed under the same conditions as in the related art. The molding shrinkage showing dimensional stability during molding is 150 ° C., 100 kgf / cm ² ,
This is a value when molded under conditions of 10 minutes (based on JIS K6911). In the example, the molding shrinkage was equivalent to that of the comparative example 1 which is a conventional product. Further, the curing time of the mold material of the present invention tends to be slightly different from that of the conventional product, but does not cause any problem in moldability.

The strength of the molded product was measured as follows. First, each mold material was subjected to transfer molding at 150 ° C. for 5 minutes to have a width of 12.7 mm and a length of 127.
It was molded into a flat plate having a height of 3.2 mm and a height of 3.2 mm to prepare a bending test sample. For these samples, the distance between the fulcrums was 50 mm and the crosshead speed was 10 mm / min. Was used to measure the bending strength. Some of the examples had slightly lower strength, but the strength was almost the same as that of Comparative Example 1 of the conventional product.

As described above, the mold material according to the present invention has both moldability and curability when compared with a mold material (referred to as fiber-reinforced plastic) made of an unsaturated polyester resin which is commonly used industrially. (Curing time), strength, etc. were almost the same, and there were no problems with dimensional stability or spiral flow length. Therefore, the molding material according to the present invention can be sufficiently applied to applications where FRP materials are usually used.

Next, the molding materials of Examples 1 to 3
The molding material of Comparative Example 1 was compression-molded at a mold temperature of 150 ° C. and an injection pressure of 35 kg / cm ² , and had a diameter of 19 m.
m was prepared. Then, a decomposition treatment test was performed on these molded products. The test method was based on immersion in a decomposition solution comprising at least a base and a solvolytic solvent. Here, a 5N aqueous sodium hydroxide solution was used as the decomposition solution. Each molded material was immersed in this solution at 90 ° C. for 24 hours, and the decomposition liquid permeation rate and the surface hardness of the molded body after the decomposition liquid immersion treatment were measured. The hardness was measured using a rubber hardness meter, considering that the molded material after the treatment was extremely brittle. Table 3 shows the results.

[0037]

[Table 3]

As compared with Comparative Example 1, the molded material molded products of Examples 1 to 3 have a uniform high penetration rate of the decomposition solution and a low surface hardness after penetration. In the molding material of Example 1, the presence of polydipropylene malonate having a high affinity for the decomposition solution allows the decomposition solution to penetrate into the molding material, and polydipropylene malonate, which is an aliphatic polyester, Subject to solvolysis. At the same time, the ester bond in the unsaturated polyester resin constituting the composition skeleton undergoes solvolysis, the binder resin loses its three-dimensional structure, the molded product collapses, and the surface hardness becomes very small. That is, it is a mold material having a very high decomposition treatment property.

Further, in the molding material of Example 2 or Example 3, the decomposition solution was further rapidly dispersed in the composition due to the presence of 2-hydroxyethyl methacrylate, an addition polymerizable monomer having a high affinity for the decomposition solution. By penetrating into the unsaturated polyester resin constituting the composition skeleton, the ester bond in the unsaturated polyester resin undergoes solvolysis more efficiently, and the disintegration of the molded article is high. That is, it is a mold material having a large decomposition solution treatment property. In addition, 2-
The same effect can be obtained by using hydroxyethyl acrylate. In addition, the higher the proportion of 2-hydroxyethyl methacrylate or 2-hydroxyethyl acrylate in the addition-polymerizable monomer, the higher the decomposability, but the curing time can be shortened due to the coexistence of styrene, and the strength during heat is increased. Because there are advantages such as possible
It is preferable to determine the type and mixing ratio of the addition-polymerizable monomer based on the required physical properties and decomposition treatment properties. On the other hand, the molding material of Comparative Example 1 is a molding material having a conventionally used composition, and cannot be treated with a solution containing a base and water as described above.

As described above, after curing and molding, the molding material of the present invention forms a three-dimensional cross-linked structure by copolymerization of the unsaturated polyester and the addition-polymerizable monomer. Propylene malonate is in a dispersed state. Therefore, by immersing the mold material after curing molding in a decomposition solution containing at least a base and a solvolyzable solvent, the decomposition solution quickly penetrates into the composition due to the presence of polydipropylene malonate, Some of the ester bonds in the unsaturated polyester resin constituting the composition skeleton undergo solvolysis, the binder resin loses its three-dimensional structure, and the molded product collapses. Further, as the addition polymerizable monomer, 2-
By containing hydroxyethyl acrylate or 2-hydroxyethyl methacrylate, a three-dimensional crosslinked structure having a 2-hydroxyethyl group having a high affinity for the decomposition solution is formed, and the affinity for the decomposition solution containing at least a base and a solvolyzable solvent is formed. The solvolysis of the unsaturated polyester resin cross-linked structure as a binder progresses more efficiently and effectively.

The degree of decomposition treatment of the mold material is as follows.
It can be changed by the selection of styrene, 2-hydroxyethyl acrylate or 2-hydroxyethyl methacrylate used as the addition-polymerizable monomer, and the mixing ratio thereof. In addition, when polydipropylene malonate is contained, it can be mixed by dissolving it in a monomer having a dissolving ability, but it is of course also possible to mix polydipropylene malonate in a powdery, fibrous, or needle-like shape. In addition, even if polyethylene malonate other than polydipropylene malonate, polypropylene malonate, polyethylene pimerate, polypropylene pimerate, or polydipropylene pimerate can be used, the same effect can be obtained.

In the boiling test with water, no difference was observed between Examples 1 to 3 and Comparative Example 1, and the water resistance of Examples of the present invention was comparable to that of the conventional product. Also,
The concentration of the aqueous sodium hydroxide solution is not limited to 5N used above, but may be adjusted to 10N or less. Further, it is more preferable to be prepared in the range of 2 to 5N.
The configuration and manufacturing method of the molding material are not limited to the above examples. For example, fillers such as calcium carbonate, calcium silicate, barium sulfate, aluminum hydroxide, talc, mica, glass fiber, carbon fiber Of course, a reinforcing agent such as the above, a thickener, a release agent, a coloring agent, and the like may be mixed. In the above example, compression molding is used when molding the molding material, but transfer molding, injection molding, or the like may be used. In the above example,
Although the bulk molding material has been described, in addition to the bulk molding material, a sheet-shaped SMC (sheet molding component) may be used.
d) and granular PMC (petletized type molding co
mpound). In addition, in the above-mentioned example, although it was formed into a cylindrical shape, the present invention is not limited to this, and a molded body having another shape, a paint, a putty, an adhesive, or the like may be used. Note that the temperature during the decomposition process is not limited to the above value, of course. However, when the decomposition treatment by the pressure-resistant device is not performed, the temperature is preferably lower than the boiling point of the decomposition solution.

Example 4 10.46 parts by weight of an unsaturated polyester (trade name: EPORAC, manufactured by Nippon Shokubai Co., Ltd.), 10.52 parts by weight of an addition polymerizable monomer, 2-hydroxyethyl methacrylate, low shrinkage 1.82 parts by weight of polydipropylene adipate and 0.25 part by weight of a hardening agent tert-butylperoxy 2-ethylhexanoate (trade name: Perhexa O, manufactured by NOF CORPORATION) and mixed well, A composition serving as a binder was obtained. Next, 9.91 parts by weight of calcium carbonate as a filler, 50.8 parts by weight of aluminum hydroxide, 1.24 parts by weight of zinc stearate as a release agent, and 0.9% by weight of carbon powder as a pigment.
37 parts by weight and 0.99 parts by weight of polyethylene were dry mixed in a kneader for about 5 minutes. The binder composition prepared above was gradually added to the dry mixture and kneaded to obtain a uniform paste. Further, 13.63 parts by weight of glass fiber was added to this paste-like material while dispersing it uniformly, and added as quickly as possible. When the glass fiber was wet and uniformly dispersed, kneading was completed to obtain a molding material.

Example 5 To 9.07 parts by weight of an unsaturated polyester (trade name: Epolak, manufactured by Nippon Shokubai Co., Ltd.), 9.91 parts by weight of 2-hydroxyethyl acrylate as an addition polymerizable monomer, and low shrinkage 1.82 parts by weight of a polypropylene adipate and 0.25 parts by weight of a curing agent tert-butylperoxy 2-ethylhexanoate (trade name: Perhexa O, manufactured by NOF Corporation), mixed well, and mixed well Was obtained. Next, 9.91 parts by weight of calcium carbonate as a filler, 50.8 parts by weight of aluminum hydroxide, 1.24 parts by weight of zinc stearate as a release agent, and 0.9% by weight of carbon powder as a pigment.
37 parts by weight and 0.99 parts by weight of polyethylene were dry mixed in a kneader for about 5 minutes. The binder composition previously prepared was gradually added to the dry mixture and kneaded to obtain a uniform paste. Further, 13.63 parts by weight of glass fiber was added to this paste-like material while dispersing it uniformly, and added as quickly as possible. When the glass fiber was wet and uniformly dispersed, kneading was completed to obtain a molding material.

Example 6 5.53 parts by weight of an addition polymerizable monomer, 2-hydroxyethyl methacrylate, and styrene 4 were added to 11.02 parts by weight of an unsaturated polyester (trade name: EPORAC, manufactured by Nippon Shokubai Co., Ltd.). 0.43 parts by weight, polydipropylene adipate 1.8 as a low shrinkage agent
2 parts by weight and a curing agent 1,1-bis (tert-butylperoxy) 3,3,5-trimethylcyclohexane (trade name: Perhexa 3M, manufactured by NOF Corporation) 0.2
5 parts by weight were added and mixed well to obtain a composition to be a binder. Next, 9.91 parts by weight of calcium carbonate as a filler, 50.8 parts by weight of aluminum hydroxide, 1.24 parts by weight of zinc stearate as a release agent, 0.37 parts by weight of carbon powder as a pigment, and 0.99 parts by weight of polyethylene was dry mixed with a kneader for about 5 minutes. The binder composition previously prepared was gradually added to the dry mixture and kneaded to obtain a uniform paste. Further, 13.63 parts by weight of glass fiber was added to this paste-like material while dispersing it uniformly, and added as quickly as possible. When the glass fiber was wet and uniformly dispersed, kneading was completed to obtain a molding material.

Since each of the molding materials of Examples 4 to 6 thus obtained is in a bulk state, it is usually used in BMC (Bulk Molding).
ing Compound), which is a non-adhesive state despite containing an addition polymerizable monomer. Among the compositions of these molding materials, the components of the different monomers, low shrinkage agents, and aliphatic polyesters are shown in Table 4. Table 5 shows the basic physical properties of these molding materials measured under the same conditions as described above.

[0047]

[Table 4]

[0048]

[Table 5]

Since the spiral flows of the molding materials of Examples 4 to 6 are almost the same as those of Comparative Example 1, it can be seen that there is no problem even if molding is performed under the same conditions as the conventional one. The molding shrinkage is slightly smaller than Comparative Example 1 and is excellent. Example 4
It can be said that the polypropylene adipate and polydipropylene adipate of low shrinkage agents used in Nos. To 6 are suitable for a molding material using 2-hydroxyethyl methacrylate or 2-hydroxyethyl acrylate as an addition polymerizable monomer. Further, the curing time of the molding material tends to be slightly different from that of the conventional product, but it does not cause a problem in moldability. The strength of the molded product was equivalent to that of Comparative Example 1.

As described above, the mold material of the present invention has a better moldability, curability (curing time), strength and the like as compared with a mold material made of an unsaturated polyester resin which is commonly used industrially. They were almost the same, and there was no problem in dimensional stability and spiral flow length. Therefore, the molding material according to the present invention can be sufficiently applied to applications in which an FRP material is usually used.

Next, the molding materials of Examples 4 to 6 were compression-molded at a mold temperature of 150 ° C. and an injection pressure of 35 kg / cm ² , thereby producing a cylindrical molded product having a diameter of 19 mm. Then, a decomposition treatment test was performed on these molded products. The test method was based on immersion in a decomposition solution comprising at least a base and a solvolytic solvent. Here, a 4N aqueous sodium hydroxide solution was used as the decomposition solution. Each molded material was immersed in this solution at 90 ° C. for 24 hours, and the decomposition liquid permeation rate and the surface hardness of the molded body after the decomposition liquid immersion treatment were measured. The hardness was measured using a rubber hardness meter. Table 6 shows the results.

[0052]

[Table 6]

The molded articles of Examples 4 to 6 have a uniform high penetration rate of the decomposition solution and a low surface hardness after penetration. Addition polymerizable monomer with high affinity for decomposition solution, 2
Due to the presence of -hydroxyethyl methacrylate or 2-hydroxyethyl acrylate, the decomposition solution penetrates into the molding material, and the ester bond in the unsaturated polyester resin constituting the composition skeleton undergoes solvolysis, and the binder resin becomes The three-dimensional structure was lost, and the molded product collapsed. That is, the surface hardness was very low, and it was in a state where any treatment such as crushing, pulverization, volume reduction, and peeling could be easily performed even by manual operations. That is, it is a mold material having a very high decomposition treatment property. In addition, since polydipropylene adipate or polypropylene adipate, which is a low-shrinking agent, also has an affinity for the decomposition solution, the decomposition solution penetrates more quickly into the composition, and the ester in the unsaturated polyester resin constituting the composition skeleton is formed. Since the bonds are more likely to undergo solvolysis, the molded article is highly disintegrable. That is, polydipropylene adipate or polypropylene adipate is an addition polymerizable monomer,
An excellent low shrinkage property is imparted to a mold material using 2-hydroxyethyl methacrylate or 2-hydroxyethyl acrylate, and the decomposition liquid treatment property is improved.

As described above, after curing and molding, the molding material of the present invention has an ester bond in the main chain by copolymerization of an unsaturated polyester and an addition-polymerizable monomer, and has a decomposition solution A three-dimensional crosslinked structure having a 2-hydroxyethyl group with high affinity is formed, and the low-shrinkage agent polydipropylene adipate is dispersed in the three-dimensional structure. Therefore, by immersing the cured molding material in a decomposition solution containing at least a base and a solvolytic solvent, polydipropylene adipate and the decomposition solution due to the presence of the 2-hydroxyethyl group are contained in the composition. While penetrating promptly, those undergoing solvolysis appear in the ester bonds in the unsaturated polyester resin constituting the composition skeleton, and the binder resin loses its three-dimensional structure,
The molded product collapses. Since it can be made very soft, the volume is reduced with little effort afterwards,
If it is crushed, or if it contains other parts,
It can be easily peeled and separated. Further, by mixing styrene as an addition polymerizable monomer, the decomposition treatment property can be changed. Further, even if polypropylene adipate other than polydipropylene adipate, polypropylene phthalate, or polydipropylene phthalate can be used, the same effect can of course be obtained. In addition, the aliphatic polyester which promotes the decomposability in the first mold material of the present invention May be mixed. In that case, the decomposability can be further improved.

On the other hand, the mold material of the present invention is not affected by water containing no base at all. Therefore, in a normal use environment, even if it is in a humid or wet state, it will not be affected. In the boiling test with water, the water resistance of Examples 4 to 6 was comparable to that of the conventional product. However, it is desirable to coat the surface for safety in an environment where it is constantly exposed to extremely high temperature and high humidity. In this case, the coating can be provided by applying and drying a solution in which a resin such as polyethylene, polypropylene, polystyrene, or polyvinyl acetal is dissolved, or a suspension in which the resin is dispersed. Since the thickness of the coating layer is about 0.1 to 0.5 mm, the surface of the coated molding material can be disassembled by shaving the surface with a file or the like and then immersing in a decomposition solution. The concentration of the aqueous sodium hydroxide solution is 4N.
It should just be prepared below 10N without being limited to. Further, it is more preferable to be prepared in the range of 2 to 5N.
The configuration and manufacturing method of the molding material are not limited to the above-described examples. For example, fillers such as calcium carbonate, calcium silicate, barium sulfate, aluminum hydroxide, talc, mica, glass fiber, carbon fiber Of course, a reinforcing agent such as the above, a thickener, a release agent, a coloring agent, and the like may be mixed.

In the above embodiment, compression molding is used at the time of molding the molding material. However, transfer molding, injection molding or the like may be used. Further, in the above embodiment, a bulk-shaped molding material has been described. However, in addition to the bulk-shaped molding material, a sheet-shaped SMC (sheet molding compound) or a granular PMC (petletized type molding compound) may be used. In the above-described embodiment, an example of molding into a cylindrical shape is used. However, the invention is not limited to this, and a molded article having another shape, a paint, a putty, an adhesive, or the like may be used. The temperature at the time of the decomposition treatment is not limited to the value of the embodiment. However, when the decomposition treatment by the pressure-resistant device is not performed, the temperature is preferably lower than the boiling point of the decomposition solution. The final molded product obtained from the molding material of the present invention includes construction materials such as bathtubs, toilet tubs, water storage tanks, and wash basins; household goods such as chairs, desks, and furniture; tiles, artificial marble, and pipes. It can be used in various fields such as civil engineering materials; bodies and parts of transportation equipment such as ships, automobiles, railways, and aircraft; housing equipment; decorative boards;

The solution obtained by immersing the molded article of the present invention and decomposing it is not limited to the composition and the compounding ratio of the above-mentioned embodiment, but may contain at least a base and a solvolyzable solvent. Good. As the base, in addition to sodium hydroxide shown in Examples, metal hydroxides such as calcium hydroxide and potassium hydroxide, metal oxides such as sodium oxide and calcium oxide, sodium ethoxide, potassium t- Metal alkoxides such as butoxide are exemplified. These can be used alone or in combination of two or more. In addition, as the solvolytic solvent,
In addition to the water used in the examples, ethanol, methanol, ethylene glycol, ammonia, acetic acid, hydrazine and the like can be mixed. In the decomposition solution, a solvent such as diethyl ether, dioxane, tetrahydrofuran, acetone, dimethylformamide, or dimethylamine may be used in addition to the solvolysis solvent.
Even if more than one species are mixed, they can be used.

Embodiment 7 Next, an embodiment of the molded motor of the present invention will be described. To 11.02 parts by weight of an unsaturated polyester (Nippon Shokubai Co., Ltd., trade name: Epolak), 5.53 parts by weight of 2-hydroxyethyl methacrylate as an addition polymerizable monomer, 4.43 parts by weight of styrene, a low shrinkage agent As polydipropylene adipate 1.8
2 parts by weight and a curing agent 1,1-bis (tert-butylperoxy) 3,3,5-trimethylcyclohexane (trade name: Perhexa 3M, manufactured by NOF Corporation) 0.2
5 parts by weight were added and mixed well to obtain a composition to be a binder. Next, 9.91 parts by weight of calcium carbonate as a filler, 50.8 parts by weight of aluminum hydroxide, 1.24 parts by weight of zinc stearate as a release agent, 0.37 parts by weight of carbon powder as a pigment, and 0.99 parts by weight of polyethylene was dry mixed with a kneader for about 5 minutes. The binder composition previously prepared was gradually added to the dry mixture and kneaded to obtain a uniform paste. Further, 13.63 parts by weight of glass fiber was added to this paste-like material in an extremely short time while uniformly dispersing the glass fiber, and kneading was completed when the glass fiber was wet and uniformly dispersed to obtain a molding material. .

This mold material and an iron core on which a winding was wound via an insulator were integrally formed at 150 ° C. to produce a mold stator as shown in FIG. This mold stator is immersed in a 5N aqueous solution of sodium hydroxide at 90 ° C. for 24 hours.
After immersion for a time, when the removal of the mold material was attempted, the mold material was removed with bare hands, and the winding and the iron core could be separated. Further, by immersing for 8 hours, the mold material partially remaining in the winding could be completely removed.

As described above, the molding motor formed by covering the iron core and the winding with the molding material of the present invention is immersed in a decomposition solution comprising a base and a solvolytic solvent to form the molding portion. Is decomposed and collapsed, so that it is easily peeled off, and the mold part and
Iron core and winding can be separated. In other words, it is a molded motor having extremely high recoverability of valuable metal. The molding material used for molding the motor is not limited to the composition of the present embodiment, but may be any molding material of the present invention.

[0061]

As described above, according to the present invention, a decomposition solution containing at least a base and a solvolysable solvent is used.
A mold material and a mold motor that can be easily disassembled can be provided.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a molded motor according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the appearance of a conventional molded motor.

FIG. 3 is a perspective view showing an appearance of a stator portion of a conventional molded motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Motor part 11 Mold stator 12 Insulator 13 Winding 14 Iron core 15 Mold part 16 Rotor shaft 17 Rotor 18 Bracket 19, 20 Bearing 21 Mounting hole 22 Flange part

Claims (5)

[Claims] 1. A thermosetting composition comprising at least an unsaturated polyester, an addition polymerizable monomer, and an aliphatic polyester as a binder, wherein the aliphatic polyester is polydipropylene succinate, polyethylene malonate, or polypropylene malonate. , A mold material comprising at least one selected from the group consisting of polydipropylene malonate, polyethylene pimerate, polypropylene pimerate, and polydipropylene pimerate. 2. The method according to claim 1, wherein the addition-polymerizable monomer is styrene or 2-styrene.
The molding material according to claim 1, wherein the molding material is at least one selected from the group consisting of hydroxyethyl acrylate and 2-hydroxyethyl methacrylate. 3. A thermosetting composition comprising at least an unsaturated polyester, an addition-polymerizable monomer, and a low-shrinkage agent as a binder, wherein the addition-polymerizable monomer is
It comprises at least one of 2-hydroxyethyl acrylate and 2-hydroxyethyl methacrylate, wherein the low-shrinkage agent is at least one selected from the group consisting of polypropylene adipate, polydipropylene adipate, polypropylene phthalate, and polydipropylene phthalate. Characteristic mold material. 4. The molding material according to claim 3, wherein the addition-polymerizable monomer further contains styrene. 5. A molded motor in which at least a part of an iron core and a winding is covered with the molding material according to claim 1.