JP3143367B2 - Structural materials, molding materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structural material used for consumer equipment, industrial equipment, office equipment, etc. The present invention relates to a molded body such as a molded stator and a recording medium, and a method for treating the molded body.

[0002]

2. Description of the Related Art In recent years, the global environment has become a problem. Among them, it is important to collect and recycle valuable resources from waste as much as possible in order to avoid resource depletion as much as possible, and to reduce the volume of waste in order to cope with the extremely small number of landfill sites for garbage. Is desired. In particular, plastics have hardly been reduced in volume after landfilling. In the past, it has been studied to reduce the volume by incineration.

[0003] A molded product in which at least a part of metals is covered with a structural material containing plastic as a binder is generally used because it has excellent electrical insulation properties and is easy to handle. For example, a molded motor is known. The use of molded motors in consumer equipment, industrial equipment, office equipment, and the like is rapidly expanding.
2. Description of the Related Art Conventionally, a mold stator of a mold motor used in an AC motor, a brushless DC motor, and the like of this type generally has a configuration as disclosed in, for example, Japanese Patent Application Laid-Open No. 61-214740. The configuration will be described below with reference to FIGS.

FIG. 5 is a perspective view showing an appearance of a conventional mold stator, and FIG. 6 is a perspective view showing a structure before being molded. As shown in these figures, in this molded stator, a winding 103 is wound inside an iron core 101 having a slot via an insulator 102, and a terminal portion of the winding 103 and a lead wire 104 are connected. The printed circuit board 106 is provided with a wiring pattern 105 to be connected, and the exterior of the stator is formed by a molding material 107 in a state where the printed circuit board 106 is mounted on the upper end of the insulator 102. The molding material 107 used in such a molding motor is, for example, a thermoplastic resin such as polyethylene terephthalate, polyethylene, polypropylene, or nylon, or a thermosetting resin such as unsaturated polyester, vinyl ester resin, or phenol resin as a binder material. Used, and further added with additives such as calcium carbonate, talc, and carbon black.

[0005] Molded motors of this type are used because they are excellent in maintainability and quietness, and can be easily automated in manufacturing.

[0006]

However, in the above-mentioned molded motor, metals such as iron cores and windings are hardly deteriorated by use of the motor, and are therefore highly valuable as reusable materials. Therefore, when discarding the molded motor, it is desirable to separate and reuse the molded material and valuable materials such as iron cores and windings from the viewpoint of effective use of resources. In such a case, in general waste disposal, first, a target object is crushed by a shredder, and then only valuable resources are selected and taken out from the crushed pieces.

However, in the conventional mold stator as described above, the mold material often adheres to metals at the time of crushing, and it is difficult to disassemble only the mold material without deteriorating the metals. Therefore, there is a problem that only metals can not be efficiently and sufficiently separated at the time of subsequent sorting. That is, the conventional mold stator has a problem that it is difficult to regenerate and reuse metals such as iron cores and windings at the time of disposal.

Although the above description has been made with respect to the mold motor, the above-mentioned problems caused by the difficulty in separating the mold material from the valuable material and the difficulty in decomposing the mold material at the time of disposal are as follows. The present invention is not limited to only the molded motor, but is common to molded articles such as plastic containers, recording media such as magnetic tapes and magneto-optical disks using a molding material.

The present invention has been made in consideration of such problems as a molded article using a conventional molding material, and has a structure capable of reducing the volume after use as an original product.
For example, it is an object of the present invention to provide a molded body such as a molded motor and a recording medium in which a valuable material such as an iron core and a winding can be easily recycled, and a processing method suitable for the molded body.

[0010]

In order to achieve the above object, the present invention has the following constitution.

That is, the present invention relates to a structural material comprising a thermoplastic aromatic polyester containing more than an aliphatic polyester (excluding polycaprolactone), and a mixture thereof comprising 20 parts by weight per 100 parts by weight of the structural material. Parts or more. In particular, the aliphatic polyester is preferably any of polycaprolactone diol, polycaprolactone triol, and polylactic acid, or a mixture thereof.

Further, according to the present invention, a molding is performed using a structural material.
A molded body, wherein the thermoplastic aromatic (except polycaprolactone) aliphatic polyesters Polyester more including their mixtures have been mixed with 20 parts by weight or more relative to 100 parts by weight of the structural member Molded article .

[0013]

Further, the molded body is a molded motor,
Thermoplastic aromatic polyester and aliphatic polyester ( Polyester )
(Excluding licaprolactone) as a binder. In this case, as a means for further improving environmental stability during use, at least a part of the molding material may be further covered with a thermosetting molding material.

Further, the molded body of the present invention is to insulator provided between the iron core and the windings of the motor, Po Li polycaprolactone diol, polycaprolactone triol, and any polylactic acid, or their A structural material in which a mixture of a plurality of kinds and a thermoplastic aromatic polyester is mixed in an amount of 20 parts by weight or more is formed.

Examples of other molded articles to which the present invention can be applied include molded motors, mold transformers, plastic containers and boxes, electric parts, and various molded articles in automobiles.

The method for decomposing a molded article of the present invention comprises the steps of: molding a molded article using a structural material containing at least 20 parts by weight of a mixture containing the above-mentioned thermoplastic aromatic polyester and aliphatic polyester at least with a base and a hydrophilic compound. The molded body is immersed in a decomposition solution containing a solvent and heated at a temperature lower than the boiling point of the decomposition solution to decompose at least a part of the structural material to reduce the volume of the molded body.

Next, the operation and effect of the present invention will be described.

As described above, the structural material of the present invention is obtained by converting a thermoplastic aromatic polyester into an aliphatic polyester (polycap).
(Excluding lolactone) . As a result, it is expected that the aliphatic polyester is dispersed and arranged in the form of particles in the thermoplastic aromatic polyester.
There are almost no particles of about 00 μm or more, and the particles are dispersed with fine particles of about tens of μm or less. For this reason, in the mixture, the dispersion of the aliphatic polyester and the thermoplastic aromatic polyester is good, and the aliphatic polyester is partially disposed adjacent to the ester bond portion of the thermoplastic aromatic polyester. it is conceivable that. In other words, the structure is such that the ester bond contained in the main chain of the thermoplastic aromatic polyester can be easily decomposed via the aliphatic polyester.

Therefore, by subjecting the aliphatic polyester contained in the structural material to thermal decomposition or solvolysis, the ester bond contained in the thermoplastic aromatic polyester can be decomposed at the same time. As a result, the mechanical strength of the molding material can be greatly reduced, and most of the molding material can be removed to easily reduce the volume.

This easiness is remarkable when the structural material contains at least 20 parts by weight of a mixture containing a thermoplastic aromatic polyester and an aliphatic polyester. Other components of the structural material include, for example, particles made of calcium carbonate, aluminum hydroxide, or the like, or fibers made of glass, nylon, or the like.

Further, since the melting point of the aliphatic polyester is generally lower than that of the aromatic polyester, the aliphatic polyester also has a function of preventing the shrinkage due to natural cooling after the heat molding, and the structural material having a low shrinkage rate after the heating. You can also get

In addition, the treatment of the molded article is performed during solvolysis.
When a decomposition solution containing at least a base and a hydrophilic solvent is used, the aliphatic polyester dissolves while being partially solvolyzed, and the ester bond part contained in the thermoplastic aromatic polyester is also contained by the base contained in the decomposition solution. It will be solvolyzed at around room temperature. Therefore, a large amount of heating is not required when the structural material is decomposed, and the decomposition can be performed more easily. This effect is particularly remarkable when the hydrophilic solvent is composed of a mixture of water and a lower alcohol.

Further, since the molded article of the present invention is formed by using the above-mentioned structural material, the mechanical strength can be easily increased after use by decomposing the structural material by heating or solvolysis. It can be greatly reduced. Thus, a molded product that can be easily disposed of can be realized.

Particularly, in the case of a molded motor which is a molded body using the above-mentioned structural material, the mechanical strength is largely reduced by heat decomposition or solvolysis of the structural material, and most of the mechanical strength is removed. Therefore, the structural material can be easily removed without performing shredder processing. As a result, valuable materials such as iron cores and windings contained therein can be easily taken out, and recycling of these valuable materials becomes easy. In this case, when the mold material as the structural material is peeled off in a state of being wet with the decomposition solution, the mechanical strength is reduced most, and the separation can be performed more easily.

Further, according to the recording medium of the present invention, since the base contains a mixture of the above-mentioned thermoplastic aromatic polyester and aliphatic polyester (excluding polycaprolactone) as a binder, the magnetic recording medium is provided. Is immersed in the above-mentioned decomposition solution to recover only the magnetic recording layer. As a result, for example, only a magnetic recording material or an optical recording material can be easily reproduced from a recording medium such as a magnetic tape or a magnetic disk which has been used or discarded at the time of production, and can be reused.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment First, a first preferred embodiment of a molding material as a structural material, a molded motor as a molded body, and a method of disassembling them, according to the present invention.
An embodiment will be described.

FIG. 1 is a sectional view of a molded motor which is an AC motor (or a brushless DC motor) in an embodiment of the molded article of the present invention. In FIG.
1 is a mold stator, 2 is a bracket, 3 is a rotor,
Reference numeral 4 denotes a flange portion having a plurality of mounting holes 5 for mounting to a chassis or the like of the device, 6 denotes an iron core, 7 denotes a winding to be energized, 8 denotes a thermoplastic aromatic polyester and an aliphatic polyester (hereinafter referred to as a molded product).
Contains polycaprolactone, except for the treatment method
) , Which is a structural material covering the winding 7 and the iron core 6, 9 is a rotor shaft forming a part of the rotor 3, and 10 is one end of the shaft 9. Bearing. In the present embodiment, an example is shown in which the flange portion 4 is formed of the molding material 8. However, as a matter of course, a configuration without the flange portion 4 may be employed similarly to the conventional example shown in FIG.

In the molding material 8, since the aliphatic polyester described above has good dispersibility in the thermoplastic aromatic polyester, the aliphatic polyester is disposed adjacent to the ester bond of the thermoplastic aromatic polyester. In other words, the structure is such that the ester bond contained in the main chain of the thermoplastic aromatic polyester can be easily decomposed via the aliphatic polyester. Therefore, in the molding material 8, the ester bond portion contained in the thermoplastic aromatic polyester can be solvolyzed simultaneously with the solvolysis of the aliphatic polyester.

Thermoplastic aromatic polyesters include bifunctional saturated acids such as isophthalic acid, phthalic acid, phthalic anhydride, terephthalic acid, and diphenylcarboxylic acid, and ethylene glycol, propylene glycol, diethylene glycol, neopentyl glycol, and hexamethylene glycol. And a polymerization product with one or more diol compounds such as polyethylene glycol and butanediol. For example, polyethylene terephthalate (chemical formula 1), polybutylene terephthalate (chemical formula 2), polycyclohexane terephthalate (chemical formula 3), and polybutylene naphthalate (chemical formula 4) are used.

[0031]

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[0032]

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[0033]

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[0034]

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The aliphatic polyester (excluding polycaprolactone) is a saturated polyester and is a thermoplastic resin. For example, polylactic acid shown in ( Chem. 6),
A polyglycolic acid represented by (Chemical Formula 7), a polycaprolactone diol represented by (Chemical Formula 8), a polycaprolactone triol represented by (Chemical Formula 9), a copolymer comprising a glycol represented by (Chemical Formula 10) and an aliphatic dicarboxylic acid. Polymeric resins, polyethylene adipates, and microbial synthetic copolyesters such as 3-hydroxypropionate, 3-hydroxybutyrate, 3-hydroxyvalerate, and 3-hydroxyoctanoate. In addition, (
Polycaprolactone shown in 5) is for reference only
Was.

[0036]

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[0037]

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[0038]

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[0039]

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[0040]

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[0041]

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[0042] In particular, Po Li polycaprolactone diol, polycaprolactone triol, and polylactic acid kneading it is easy, it is recommended.

The molding material 8, which is a structural material, can be composed only of a mixture of the above-mentioned thermoplastic aromatic polyester and the above-mentioned aliphatic polyester (excluding polycaprolactone). 20 parts by weight or more of this mixture can be mixed per part.
If the amount is less than 20 parts by weight, it becomes difficult for the decomposition solution to penetrate into the structural material, and it takes too much time to reduce the volume.

In addition to this mixture, other materials that can be mixed into the structural material include release agents such as stearic acid, zinc stearate and calcium stearate, waxes such as Hoechst wax, carnauba wax and paraffin, titanium white, chromium oxide, Various coloring materials such as carbon black and the like, and thermoplastic resins such as polystyrene and acrylic resin can be mixed to improve the resin properties.

In order to further increase the mechanical strength during molding, carbonates such as calcium carbonate and magnesium carbonate, (sulfites) such as calcium sulfate, barium sulfate and calcium sulfite, clay, mica, glass balloons, Silicates such as montmorillonite, silicic acid, kaolin, talc, silica, siliceous earth, iron oxide, pumice balloon, titanium oxide, oxides such as alumina, hydroxides such as aluminum hydroxide and magnesium hydroxide, graphite, Inorganic additives such as glass fibers, carbon fibers and asbestos fibers, shell fibers such as wood flour and rice hulls, and organic additives such as cotton, paper chips, nylon fibers and wood cellulose can be mixed.

The mixture is composed of more thermoplastic aromatic polyester than the above-mentioned aliphatic polyester.
This is because, when the amount of the aliphatic polyester is increased, the mechanical strength is greatly reduced, and at the time of general use, the hydrolysis is increased and the use conditions are strict. In particular, it is recommended that an aliphatic polyester be mixed into 30 parts by weight or less of 100 parts by weight of the mixture.

The aliphatic polyester is adjusted to at least 3 parts by weight based on 100 parts by weight of the mixture contained in the molding material 8. This is because if the amount is less than 3 parts by weight, the main chain of the thermoplastic aromatic polyester cannot be decomposed at a sufficient speed, probably because the mixing amount is too small, even though the aliphatic polyester is mixed.

Next, detailed examples (experimental examples) of the molding material 8 of the present invention will be described. In this experimental example, a reference sample and a sample, which were experimentally produced using the respective mold materials 8 as described below, were first heated and molded at about 250 ° C. to a thickness of 1 mm.
Decomposition was confirmed using a sample cast into a 10 mm × 20 mm plate and further cut into a rectangle of 10 mm × 20 mm. ( Sample 1 for Reference ) The molding material 8 was composed of 80 parts by weight of polyethylene terephthalate (manufactured by Mitsubishi Rayon Co., Ltd., trade name: Diamondite, hereinafter abbreviated as “PET”) represented by (Chem. 1), and 4) Polycaprolactone (molecular weight: 40,000, manufactured by Daicel Chemical Co., Ltd., trade name: Placcel) was composed of only 20 parts by weight of a mixture. First, in order to obtain a uniform mixture, PET was put into a kneader heated to 280 ° C. and melted, and then polycaprolactone was mixed and kneaded for about 15 minutes. (Sample Example 2) 80 parts by weight of polyethylene terephthalate (manufactured by Mitsubishi Rayon Co., Ltd., trade name: diamondite, hereinafter abbreviated as “PET”) represented by (Chemical Formula 1) was used as the mold material 8; (Made by Shimadzu Corporation, trade name: Lacty) was composed only of a mixture of 20 parts by weight.
In this case, similarly to the above-described sample example 1, first, PET is put into a kneader heated to 280 ° C. and melted to obtain a uniform mixture, and then mixed with polylactic acid and kneaded for about 15 minutes to produce a prototype. did. (Sample Example 3 for Reference ) The molding material 8 was constituted by mixing calcium carbonate as an additive into a resin composition. In other words, reference sample example 1
And 100 parts by weight of heavy calcium carbonate having an average particle diameter of 20 μm (manufactured by Maruo Calcium Co., Ltd.) was added to 100 parts by weight of the mixture indicated by. After forming a mixture of PET and polycaprolactone with a kneader, the mold material 8 was mixed with calcium carbonate and kneaded with the kneader for about 10 minutes to produce a prototype. (Sample Example 4 for Reference ) A molding material 8 was constituted by mixing calcium carbonate and glass fiber as additives in a resin composition. In other words, reference
For 100 parts by weight of the mixture shown in
Further, 100 parts by weight of heavy calcium carbonate having an average particle diameter of 20 μm (manufactured by Maruo Calcium Co., Ltd.) and a length of 20 mm
Was added by 30 parts by weight. After forming a mixture of PET and polycaprolactone with a kneader, the mold material 8 was mixed with calcium carbonate and glass fiber sequentially and kneaded with the kneader for about 15 minutes to produce a prototype. (Comparative Example) The mold material was composed only of PET represented by (Chemical Formula 1).

In these decomposition experiments, 30 cc of a NaOH aqueous solution (1 kg of water was mixed with NaO
H (160 g dissolved) together with each sample (10 mm × 20 m
m, 1 mm thick rectangular body) at room temperature (about 25 ° C)
For 110 hours, and the change in weight of each sample was measured. The experimental results are shown in (Table 1).

[0050]

[Table 1]

As shown in the table, it was found that the volume could be sufficiently reduced by heating to a temperature not boiling. Although a slight weight loss was also confirmed in the comparative example, the weight loss in the binder component was larger than the sum of the weight loss in the comparative example and the weight of the added aliphatic polyester in the reference sample examples and sample examples 1 to 4. Were confirmed, and reference sample 1 and sample 2
Then it was partially cracked. From this, it was found that the decomposition of PET was greatly promoted by the incorporation of the aliphatic polyester. At this time, the NaOH aqueous solution is replaced with HCl.
Infrared spectroscopy of the precipitates formed when neutralized with was detected, isophthalic acid and ethylene glycol were detected, confirming that a part of the main chain of the thermoplastic aromatic polyester had been solvolyzed. did it. That is, not only volume reduction but also recovery and regeneration of isophthalic acid and ethylene glycol can be performed.

From the results of this experiment, it is found that even if other additives such as calcium carbonate are added, the ester bond portion of the thermoplastic aromatic polyester can be obtained by uniformly mixing the aliphatic polyester with the thermoplastic aromatic polyester. It was confirmed that the mold material 8 that easily undergoes solvolysis can be produced on a trial basis.

In the decomposition results of Reference Samples 3 and 4 (Table 1), only the same amount of binder weight loss as Reference Sample 1 was confirmed. This is because they did not fall down significantly. However, in the decomposition at this time, it was found that although the calcium carbonate and the glass fiber remained in a large amount, the strength was reduced enough to be cut with bare hands. As a result, even in the case where the mechanical strength of the mold material is improved by adding the above-mentioned reinforcing material, release material, etc., the mechanical strength is greatly reduced by the disassembling operation, thereby facilitating the removal and removal of the mold material. It was confirmed that it could be done.

Further, regarding the structure of Sample 3 for reference ,
The case where the mixed particles were further increased was examined. In other words, reference
For 100 parts by weight of the mixture shown in
100, 200, 400, 500 heavy calcium carbonate
Kneading trials were made for parts by weight. In the heat molding, a plate having a size of 20 mm × 40 mm × 7 mm (thickness) was formed, and decomposition was attempted using the NaOH aqueous solution shown in (Table 1). Since the portion where the aqueous solution permeated was softened, the degree of softening at each time was confirmed in the thickness direction.
The thickness from the surface of the soft structural material after immersion of each plate for 100 hours was 3 mm, 3 mm, 2 mm, and 1 mm. After further immersion for 500 hours, most of the plates softened, but only the plate with 500 parts by weight of calcium carbonate was 1 mm.
It did not soften more than that. From this,
The mixture of the thermoplastic aromatic polyester and the aliphatic polyester preferably contains at least 20 parts by weight of the structural material in order to improve the permeability of the decomposition solution.

Next, the method for disassembling the molded article of the present invention will be described. (First Embodiment)

In the above-mentioned solvolysis, when a decomposition solution containing at least a base and a hydrophilic solvent is used, the aliphatic polyester (polyethylene) contained in the molding material 8 as a structural material is used.
(It does not necessarily exclude caprolactone) is dissolved while being partially solvolyzed, and the ester bond of the thermoplastic aromatic polyester is also solvolyzed by the base contained in the decomposition solution. Therefore, the dissolution of the aliphatic polyester and the solvolysis of the ester bond portion can both be achieved, and the decomposition of the molding material 8 can be performed more efficiently.

Here, the base dissociates upon contact with water to generate a hydroxyl group. Examples of the base include metal hydroxides such as sodium hydroxide and potassium hydroxide, metal oxides such as sodium oxide and calcium oxide, and sodium hydroxide. One or more metal alkoxides such as ethoxide and potassium t-butoxide can be selected.

The hydrophilic solvent is an organic solvent having a good affinity for water, for example, ethanol, methanol,
One or more can be selected from lower alcohols such as isopropyl alcohol, ethylene glycol, propylene glycol, diethylene glycol diethyl ether, dioxane, tetrahydrofuran, acetone and the like. Particularly, lower alcohols are excellent in solvolysis at room temperature, and a mixture of water and lower alcohol is particularly recommended. Of course, in order to lower the surface tension, suppress volatility, or impart antiseptic property, a few wt% of a surfactant, ethylene glycol, an antiseptic, and other modifiers can be added to this solution. .

In order to efficiently carry out solvolysis with a base, it is necessary to generate a hydroxyl group, and since water is consumed in the decomposition, it is desirable that some water is always contained in the decomposition solution. However, as the water increases, the osmotic power to the aliphatic polyester becomes weaker, so it is preferable that the water is adjusted to only the water necessary for decomposition and separation of the base, and when the decomposition time becomes longer or the decomposition solution is reused. It is preferable to continue decomposition while adding water. If this water is less than 1% by weight of the decomposition solution, a sufficient effect on the decomposition cannot be obtained even if the base is ionized, so it is desirable to adjust the water to 1% by weight or more.

A detailed example (experimental example) using the decomposition solution will be described below. The above-mentioned reference
The mold material 8 of the sample example 1 was immersed in a solution having the composition shown in the following (Table 2) at room temperature for 15 hours, and the weight change was examined. The results are shown in Table 3 below.

[0061]

[Table 2]

[0062]

[Table 3]

As shown in Table 3, at least the presence of sodium hydroxide as a base and ethanol as a hydrophilic solvent makes the decomposition solution effective, and the samples immersed in the decomposition solutions 1 and 2 show The weight was greatly reduced due to the solvolysis, and the volume was also significantly reduced.

Further, as can be seen from the result of the decomposition solution 2, by adding water to the hydrophilic solvent ethanol, the weight was reduced by less than 2 times. This indicates that the mixed solution of water and the hydrophilic solvent ethanol exerts a greater effect. Comparing with the results of the above (Table 1), it can be confirmed that the solvolysis can be performed in a short time only by immersion at room temperature, and a decomposition solution suitable for decomposition of the mold material 8 is realized. Even if methanol was used instead of ethanol in this decomposition solution, the weight loss was greater when water was added in addition to the base.

Although not shown in the table, even in the case of Sample Example 3 in which calcium carbonate was mixed, the use of the decomposition solution 2 showed a weight loss of about 30 wt% in 15 hours. Of course, no weight change was observed even when the samples according to the above-mentioned comparative example (in which the molding material was composed only of PET) were immersed in decomposition solutions 1 and 2 and comparative solutions 1 and 2 at room temperature for 15 hours.

The decomposition by each decomposition solution is accelerated by heating. For example, with a decomposition solution heated to 60 ° C., the degree of decomposition which took 15 hours at room temperature can be achieved in about 2 hours. However, in order to avoid volatilization of the hydrophilic solvent in a large amount by this heating, it is desirable to suppress the heating to a temperature not higher than the boiling point of the hydrophilic solvent.

The mold stator 1 molded with the molding material 8 has sufficient mechanical strength by the molding material 8 and at the same time, is easily solvolyzed under a specific environment. Therefore, after use, the mechanical strength of the molding material 8 is sufficiently reduced by sealing heating using the above-described NaOH aqueous solution or the like and solvolysis at a low temperature using the above-mentioned decomposition solution, and many molding materials 8 are removed. Thus, the winding 7 and the iron core 6 can be easily recycled.

After immersion in the decomposition solution, it is preferable that the mold material 8 as a structural material be peeled off while keeping it moist. Because when dried, the mechanical strength increases,
This is because peeling becomes difficult. In addition, since it contains a strong alkali, it is removed from the decomposition solution to make it easy to handle, and then separated from another solution, for example, water or lower alcohol only, or a mixture of these for a sufficient time and then peeled off. It is also recommended to do.

Next, an experimental example regarding this point will be described. Using the reference sample of the molding material 8 and the sample examples 1 to 4, the winding 7 and the iron core 6 were molded (the maximum thickness of the molding material was 5 mm) as shown in FIG. . When this mold stator 1 was immersed in the decomposition solution 2 shown in (Table 2) at 60 ° C. for 10 hours, most of the mold material 8 was decomposed using the reference sample examples 1 and 2. It was removed and only the winding and iron core were obtained. Regarding the sample examples 3 and 4, there were many cases where the molding material 8 was stuck to the winding and the iron core and remained, however, calcium carbonate (and Glass fiber) peels off
The winding 7 and the iron core 6 could be easily separated.

According to this example, it was found that not only the winding 7 and the iron core 6 but also calcium carbonate, glass fiber and the like can be easily reused. In particular, the glass fiber was hardly changed in physical properties because it was not heated, and was not finer than necessary because it was not cut. Thus, it could be reused as it was.

Of course, when the mold material of the comparative example was used, the decomposition did not proceed greatly, and the mold material could not be peeled off even if it was hit with a hammer. Second Embodiment Next, a preferred second embodiment of a stator of a molded motor, which is a molded article of the present invention, and a method of disassembling the stator will be described with reference to FIG.

FIG. 7 is a partial sectional view of the mold stator of the present invention. Numeral 11 in the figure denotes an insulator for insulating between the iron core 6 and the winding 7, and the molding material 8 is made of a thermoplastic aromatic polyester and an aliphatic polyester that mold around the winding 7. It is composed of an internal molding material 8a using the mixture as a binder, and an external molding material 8b, which is a thermosetting molding material for molding the periphery thereof.

In this embodiment, the environmental stability during use of the molded stator 1 can be assured by the external molding material 8b rather than the one using the single molding material 8 shown in FIG. For example, a mold stator 1 that can be used even in a high-temperature and high-humidity state in which aliphatic polyester is likely to decompose or deteriorate.
Can be prototyped.

The inner molding material 8a is made of the above-mentioned thermoplastic aromatic polyester and aliphatic polyester (polycapropolyester).
Lactone is not always excluded) as a binder. External molding material 8b
Is a molding material containing a thermosetting resin, for example, a thermosetting (or light) curing material containing an unsaturated polyester, vinyl ester resin or phenol resin as a binder. Of course, as described above, the outer mold material 8b is not only an inorganic additive material, an organic additive material, a release material, a coloring material, and waxes, but also beryllium oxide, magnesium oxide, magnesium hydroxide, calcium oxide, calcium hydroxide, oxidized oxide, and the like. Thickeners such as zinc, benzoic acid, phthalic anhydride, tetrahydrophthalic anhydride, and maleic anhydride, polyethylene, polypropylene, polystyrene, vinyl acetate resin, polymethyl methacrylate, ethylene vinyl alcohol resin, acrylic copolymer resin, saturated polyester An anti-shrinkage agent made of thermoplastic resin such as resin,
A release agent such as stearic acid, zinc stearate and calcium stearate may be constituted by appropriately mixing a curing agent such as benzoyl peroxide, t-butyl perbenzoate, t-butyl peroxybenzoate and t-butyl peroctoate. it can.

The unsaturated polyester is an unsaturated polybasic acid,
It is obtained by reacting a saturated polybasic acid with a glycol.
Unsaturated polybasic acids include, for example, maleic anhydride, fumaric acid,
Itaconic acid and citraconic acid. Saturated polybasic acids include, for example, phthalic anhydride, isophthalic acid, terephthalic acid, adipic acid, sebacic acid, tetrahydrophthalic anhydride, methyltetrahydrophthalic anhydride, endomethylenetetrahydrophthalic anhydride, heptic acid, tetrabromophthalic anhydride, and the like. is there. The glycols include, for example, 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. It is.

The vinyl compounds include, for example, styrene, vinyl toluene, α-methylstyrene, methyl methacrylate,
Vinyl acetate, diallyl phthalate, diallyl isophthalate, diallyl tetrabromophthalate, phenoxyethyl acrylate, 2-hydroxyethyl acrylate, 1-6 hexanediol diacrylate and the like.

The unsaturated polyester is represented by, for example,
The one synthesized from neopentyl glycol, isophthalic acid and fumaric acid as shown by the following, the one synthesized from propylene glycol, phthalic anhydride and fumaric anhydride as shown in (Chemical formula 12), As shown, there are those synthesized from propylene glycol, isophthalic acid, maleic anhydride, and the like.

[0078]

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[0079]

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[0080]

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In the disassembling process of the mold stator 1 of this embodiment, the efficiency of solvolysis is low because it is difficult to infiltrate the solvent from the outside. Then, after at least the inner mold material 8a is exposed so as to come into contact with the decomposition solution, it must be subjected to the decomposition treatment. At this time, the disassembly proceeds from the exposed portion to form a cavity around the winding, and after a sufficient disassembly is completed, the iron core 6 can be easily hit by an external impact.
At the same time, the winding 7 can be taken out. This expression can be realized, for example, by making a hole with a drill or making a scratch so as to be exposed with a saw.

The insulator 11 is required to have electric insulation, and for example, a thermoplastic resin such as polyethylene terephthalate or polyethylene can be used. Since the insulator 11 is also required to maintain the shape of the winding 7 during molding,
It is preferable to select a material having a softening point or melting point that is equal to or higher than the temperature at the time of molding, for example, about 100 ° C. so as not to greatly soften during molding.

When a mixture of a thermoplastic aromatic polyester and an aliphatic polyester or only an aliphatic polyester is used for the insulator 11, when the mold stator 1 is disassembled, the winding 7 and the iron core 6 are simultaneously separated. It can be carried out. Since the mixture of the thermoplastic aromatic polyester and the aliphatic polyester has a softening point exceeding 100 ° C., it does not deform during molding. When only an aliphatic polyester is used, it is preferable to use a copolymer resin shown in Chemical formula 10 which is an aliphatic polyester having a melting point exceeding 100 ° C. in many cases. Further, the molding temperature of the inner molding material 8a is set to the insulator 11 so that the molding temperature of the inner molding material 8a is not deformed due to the temperature at the time of molding.
It is preferable to select the temperature below the deformation temperature.

In this embodiment, the insulator 11 used in the molded motor has been described. However, the insulator 11 used in a general motor not covered with the molding material 8 can of course be used. In this case, by immersing the motor in the decomposition solution, the insulator, which is the only resin component, can be removed without disassembling the motor, and the metals constituting the motor can be easily regenerated. In general, the insulator 1
Since No. 1 is formed thinly, it is not necessary to consider the permeability of the decomposition solution greatly as described above, and the mixture of the aliphatic polyester and the aromatic polyester may be included. Of course, structural materials containing more than 20 parts by weight of the mixture are naturally recommended because of their rapid decomposition.

In the present embodiment, an example is shown in which a thermosetting molding material is used as the external molding material 8b. However, a molding using a thermoplastic resin such as a thermoplastic aromatic polyester containing no aliphatic polyester as a binder is used. Of course you can also use wood.

A conventional molded stator as shown in FIG. 6 is provided with a thermoplastic aromatic polyester and an aliphatic polyester.
It is also useful to use an insulator 11 using a mixture of ( not necessarily excluding polycaprolactone) .
In this case, as shown in the conventional example, the disposal treatment is a pulverization treatment, but the decomposed solution containing at least a base and a hydrophilic solvent is added to the metal pieces after the pulverization and selection, for example, as described in (Table 2). When used, the aliphatic polyester contained in the molding material 8 can be dissolved while being partially solvolyzed, and the ester bond of the thermoplastic aromatic polyester can be solvolyzed by the base contained in the decomposition solution. Therefore, most of the resin adhered to the metal piece can be removed, and a good quality metal piece can be taken out.

Furthermore, in practice, defective products of several percent or less are produced in a conduction confirmation test at the time of manufacture of a molded motor, and thus are treated as industrial waste before being molded. This is because it takes too much time to separate the insulator 11. However, an insulator 11 using a mixture of a thermoplastic aromatic polyester and an aliphatic polyester
By using the above, only the metals can be easily separated and recovered by the above-mentioned decomposition solution, and the metals can be effectively reused without discarding these defective products.

Next, examples (experimental examples) of the present embodiment will be described.

[0089] In the following experiments, described above in the insulator 11 ginseng
Considerable sample example 1 was used. That is, 80 parts by weight of PET represented by the above formula (1) and 20 parts by weight of polycaprolactone (molecular weight: 40,000, manufactured by Daicel Chemical Co., Ltd., trade name: Placcel) represented by the following formula (1) The core 7 was inserted into the mixture, and the outer periphery was wound with an enamel wire to form a winding 7. Furthermore, insulator 1
1 using the same mixture so as not to significantly deform
The internal molding material 8a was formed to a thickness of approximately 2 mm by pressure molding while heating to about 0 ° C. External molding material 8
b is 70 parts by weight of an unsaturated polyester resin containing the unsaturated polyester represented by Chemical Formula 13 (trade name: Epolac, manufactured by Nippon Shokubai Co., Ltd.), 30 parts by weight of styrene, and a curing agent t-butyl par. 1 part by weight of oxybenzoate (trade name: Perbutyl Z, manufactured by NOF Corporation), 200 parts by weight of heavy calcium carbonate (manufactured by Maruo Calcium Co., Ltd.) having an average particle diameter of 20 μm, and a glass of 20 mm in length The fiber was constituted by adding 30 parts by weight of the fiber. Using the outer molding material 8b, molding was performed on the outer periphery of the inner molding material 8a at the thickest point by about 6 mm to produce a prototype of the molded stator 1.

The mold stator 1 was hit with a hammer to expose a part of the inner mold material 8a, and was immersed in the decomposition solution 2 of (Table 2) and left for 48 hours. Is almost decomposed, and the external molding material 8b
Only the winding 7 and the iron core 6 remained in the cavity formed from the above. Therefore, this is hit with a hammer to form the external molding material 8.
By dividing b, metals could be separated and recovered.

Further, when the mold stator 1 was crushed and sorted by a shredder, many of the metal pieces had resin adhered thereto, and were recovered as low-grade metals. This metal piece was immersed in the decomposition solution 2 of (Table 2) and
When it was put into a rolling mixer for about an hour, only metals remained, and high-quality metal pieces could be recovered. That is, it was possible to obtain a mold stator capable of recovering good metals by using the above-mentioned decomposition solution even in the pulverization process.

Of course, the iron core 6 is inserted into the insulator 11 and
When the winding 7 was formed by winding the outer periphery with an enameled wire and left standing for 24 hours in the above-mentioned decomposition solution, the insulator 11 was almost removed, and only the metals could be easily separated. (Third Embodiment) Next, a preferred third embodiment of a stator for a molded motor and a disassembly method thereof according to the present invention will be described with reference to FIG.

FIG. 13 is a partial sectional view of the mold stator of the present invention. In the present embodiment, in the mold stator 1 described with reference to FIG. 2, the insulator 11 is made of a mold material using a mixture of a thermoplastic aromatic polyester and an aliphatic polyester as a binder, and a part of the mold material 8 is used. Of the mold stator 1
It is greatly expressed in a.

In this embodiment, even if the inner molding material 8a is not exposed during the disassembling process, the insulator 11 is disassembled in this state. The wick 6 can be separated. In this embodiment, the case where the internal molding material 8a is used is shown. However, the same effect can be obtained by a configuration in which the molding material is simply molded with the molding material 8 made of a conventional thermosetting resin without dividing the molding material into the inside and the outside. Obtainable.

The decomposition processing in this case is performed as follows. First, the insulator 11 is solvolyzed by a decomposition solution containing a base and a hydrophilic solvent. As a result, the iron core 6 and the winding 7
Are separated from each other, and the space where the insulator 11 was present becomes a cavity. Therefore, in this state, by applying a blow to the shell from the outside so that the shell is broken, the winding 7 and the iron core 6 are broken.
And can be taken out.

In each of the embodiments shown in FIGS. 1 to 3,
Although the molding of the mold stator 1 used in a brushless DC motor or an AC motor is described, the rotor 3 is molded using a wound rotor used in a DC motor or the like, or a linear motor or the like is used. It is a matter of course that a molded motor having completely different construction can be manufactured by using the molding material 8 which is the structural material described in the embodiment of the present invention in consideration of the disassembly. (Fourth Embodiment) This embodiment relates to a recording medium, and FIG. 4 is an enlarged partial sectional view of a magnetic tape which is a magnetic recording medium using the structural material of the present invention. In the figure, reference numeral 20 denotes a magnetic tape, 21 denotes a base having a binder made of a mixture of a thermoplastic aromatic polyester and an aliphatic polyester, and 22 denotes a magnetic recording layer made of a magnetic recording material.

Incidentally, in the conventional magnetic tape, a thermoplastic resin such as polyethylene terephthalate, cellulose, polyvinyl chloride, polyethylene naphthalate,
Polyimide or the like was used. Since these substrates cannot be decomposed at low temperatures, when the magnetic tape is discarded after use, it has been incinerated or landfilled. Although some magnetic materials can be reused in incineration, it was difficult to reuse them as magnetic recording materials because carbon was mixed into the magnetic recording materials in large amounts or oxidized.

On the other hand, in the present embodiment, since the base 21 of the magnetic tape 20 contains the above-mentioned mixture of the thermoplastic aromatic polyester and the aliphatic polyester as a binder, the magnetic tape 20 is The magnetic recording layer alone can be recovered by immersion in the decomposition solution of the above. Therefore, it is possible to regenerate the magnetic material from the used or produced waste disposal tape.

However, in order not to significantly reduce the tensile strength of the base 21, it is preferable that the aliphatic polyester contained in 100 parts by weight of the mixture be 30 parts by weight or less.

A conventional magnetic recording layer 22 can be used. The magnetic recording layer 22 is formed by applying and drying a solution containing at least a powder of a magnetic recording material and a binder, or is formed on the substrate 21 by vapor deposition or sputtering. Those in which a film of a magnetic recording material is directly formed can be used. As the magnetic recording material, for example, iron oxide, chromium oxide, cobalt-modified iron oxide, and Ba ferrite can be used.

As the binder, for example, vinyl chloride / vinyl acetate, vinyl chloride / acrylonitrile, nitrocellulose, polyester, polyurethane, polyamide and the like can be used. However, in order to facilitate the recovery of only the magnetic material when the decomposition treatment is performed, it is recommended to include the above-mentioned mixture of the thermoplastic aromatic polyester and the aliphatic polyester or the aliphatic polyester.

When the magnetic recording layer 22 is formed by applying a solution, a simple substance or a mixed liquid of methyl ethyl ketone, cyclohexanone, butyl acetate, toluene or the like is used as a solvent. In addition, the magnetic recording layer 22 formed by coating has a dispersant including various surfactants and a silane coupling agent,
Lubricants such as fatty acid amide and liquid paraffin, antistatic agents such as carbon black, abrasives such as aluminum and silicon carbide, and the like can be appropriately mixed.

In this embodiment, the magnetic tape 20 is
And the magnetic recording layer 22 alone, an undercoat layer between the substrate 21 and the magnetic recording layer 22, a backcoat layer on the substrate surface opposite to the magnetic recording layer, and a topcoat layer on the surface of the magnetic recording layer. Of course, it is also possible to configure such as appropriate.

When a box such as a cartridge for protecting a magnetic tape used for a music tape, a video tape or the like is formed, a mold using a mixture of a thermoplastic aromatic polyester and an aliphatic polyester as a binder is used. When the material is used as a molding resin, the process of separating the magnetic tape 20 from the box can be omitted, so that the processing is facilitated.
Especially recommended.

Further, in this embodiment, the magnetic tape has been described as the magnetic recording medium. However, the base of the disk-shaped magnetic recording medium may be a base made of a mixture of a thermoplastic aromatic polyester and an aliphatic polyester as a binder. The same effect can be obtained by using the same. At this time, the present invention can be used not only for a layer formed of a magnetic recording material but also for a layer formed of an optical recording material utilizing a phase change between an amorphous state and a crystalline state.

The structural material shown in the present invention is used not only for the molded stator or the magnetic tape described in each embodiment, but also for a general electric part such as a plastic bottle, a box of switches, and a molded article of an automobile. Also, for other molded products such as a mold transformer containing metals inside, molding using this structural material facilitates recycling. In addition, since the structural material itself has decomposability, FRP (fiber reinforced plastic) or SMC (sheet molding compound) using the molding material (including a large amount of glass fiber) of the present invention for the purpose of volume reduction. ) Products can also be created. Further, the decomposition solution described in the above embodiment also exhibits low-temperature decomposability and removal properties for FRP and SMC products using the mold material of the present invention, and facilitates disposal.

[0107]

As described above, according to the structural material of the present invention, the aliphatic polyester in the mixture contained as a component
By thermal decomposition or solvolysis of polycaprolactone (excluding polycaprolactone) , the ester bond portion contained in the thermoplastic aromatic polyester in the mixture can also be decomposed at the same time, so that the mechanical strength of the structural material is reduced. The volume can be greatly reduced, and most of the volume can be removed, so that the volume can be easily reduced.

Therefore, in the molded article of the present invention molded using such a structural material, the mechanical strength is easily greatly reduced by thermally decomposing or solvolyzing the structural material after use. Can be. As a result, a molded product that can be easily disposed of is realized.

In the molded motor of the present invention, in particular, when the above-mentioned structural material is used as the molding material, the mechanical strength can be largely reduced by thermal decomposition or solvolysis, and most of the mechanical strength can be removed. The mold material can be easily removed without performing shredder processing. As a result, valuable resources such as iron cores and windings, which have been wrapped in the molding material, can be easily taken out, and their recycling is facilitated.

Further, according to the recording medium of the present invention, since the above-mentioned structural material is formed on the substrate, each recording material can be collected by disassembling the substrate. Therefore, the recording material can be easily reproduced from a recording medium such as a magnetic tape, a magnetic disk, or an optical disk which has been used or discarded at the time of production, and can be reused.

In the above case, particularly when the method for decomposing a molded article of the present invention is used, the aliphatic polyester (poly ) in the mixture is decomposed with a decomposition solution containing a base and a hydrophilic solvent.
(It does not necessarily exclude caprolactone) while dissolving it while partially solvolyzing it, and the base contained in the decomposition solution can also solvolyze the ester bond part contained in the thermoplastic aromatic polyester at around room temperature. . Therefore, at the time of disassembling the structural material, a large amount of heating is not required, the decomposition can be performed more easily, and deterioration of the valuables attached or bonded to the structural material can be avoided.

[Brief description of the drawings]

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

FIG. 2 is a partial sectional view showing a stator of a molded motor according to a second embodiment of the present invention;

FIG. 3 is a partial sectional view showing a stator of a molded motor according to a third embodiment of the present invention;

FIG. 4 is an enlarged partial sectional view showing a recording medium according to a fourth embodiment of the present invention;

FIG. 5 is an external perspective view showing a conventional molded motor.

FIG. 6 is a perspective view showing the appearance of a conventional mold stator before molding.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mold stator 6 Iron core 7 Winding 8 Molding material 8a Inner molding material 8b Outer molding material 11 Insulator 20 Magnetic recording medium (magnetic tape) 21 Base 22 Magnetic recording layer

Continuation of front page (56) References JP-A-57-87453 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C08J 5/18 C08J 11/16-11/28 C08L 67 / 00-67/04

Claims (9)

(57) [Claims] 1. A structural material comprising a thermoplastic aromatic polyester which is higher than an aliphatic polyester (excluding polycaprolactone), and a mixture thereof comprising 10 % of said structural material.
A structural material characterized by being mixed in 20 parts by weight or more with respect to 0 parts by weight. 2. The structural material according to claim 1, wherein the aliphatic polyester is one of polycaprolactone diol, polycaprolactone triol, and polylactic acid, or a mixture thereof. 3. A molded article molded using a structural material.
Te, moldings thermoplastic aromatic (except polycaprolactone) aliphatic polyesters Polyester more including their mixtures, characterized in that it is mixed with respect to 100 parts by weight of the structural member 20 parts by weight or more . 4. A mixture of any one of polycaprolactonediol, polycaprolactonetriol, and polylactic acid, or a mixture thereof and a thermoplastic aromatic polyester, in an amount of 20 parts by weight or more per 100 parts by weight. A molded article characterized by being molded using a structural material. 5. The molded article is a recording medium, wherein the structural material is used as a substrate, and a magnetic recording material or an optical recording material is formed on a surface of the substrate. The molded article according to the above. 6. The molded article according to claim 3, wherein at least a part of the metal member is covered with the structural material. 7. The molded body according to claim 6, wherein the molded body is a molded motor, the metal member contains at least copper, and the structural material contains at least inorganic particles. 8. The molded article according to claim 3, wherein at least a part of the surface is covered with the structure containing at least a thermosetting resin. 9. An insulator disposed between an iron core and a copper wire of a motor is formed of the structural material including a mixture of an aliphatic polyester and a thermoplastic aromatic polyester. 3. The molded article according to 3.