Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1997-08-14
1999-10-19
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C08L 6706
Patent
active
059690097
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a molding material which is superior in strength and heat resistance and is capable of easily performing waste disposal after use, and a molded motor using the molding material.
BACKGROUND ART
Although thermosetting resins comprising an unsaturated polyester and an addition-polymerizable resin as a skeleton are sometimes used alone, they are exclusively used as a composite material and about 80% of them produced are used as a fiber reinforced plastic (FRP). These thermosetting resins are applied to molding materials, laminates, adhesives, paints, etc. because formulation of fillers and additives (e.g. inorganic materials, etc.) and reinforcement by fibers are easily performed.
On the other hand, a three-dimensional structure is imparted to these resins by a curing reaction to convert into an insoluble
on-fusible solid. Therefore, it has hitherto been considered that these thermosetting resins are not easily decomposed and are not suitable for regeneration treatment and reuse, which results in disposal of them.
Molding materials are molding compounds prepared by filling inorganic materials (e.g. glass fiber, calcium carbonate, talc, silica, etc.) or organic materials (e.g. pulp, wood, etc.) into a resin as a binder. These molding materials are used for various applications in the industrial and household fields because large specific strength and specific rigidity are obtained by filling them.
Since these molding materials are composite materials, it is generally difficult to perform regeneration treatment after use. Furthermore, if the binder resin is a thermosetting resin, a three-dimensional structure is imparted to the binder resin by a curing reaction to convert into an insoluble
on-fusible solid. Therefore, it has hitherto been considered that the binder resin is not easily decomposed and is not suitable for regeneration treatment and reuse, which results in disposal of it. As the problem about wastes has attracted special interest recently, the development of the reuse/regeneration technique has been required and a study of conversion into raw materials by heat decomposition has started. However, advantages of the thermosetting resin or molding material (e.g. hardness, magnification of strength, heat resistance, non flammability, chemical resistance, etc.) make it difficult to perform waste disposal from the technical point of view.
Recently, an apparatus using a molding material comprising a thermosetting resin as a binder, e.g. molded motor, has been applied to household apparatuses, industrial apparatuses, business apparatuses and the like. Since the molded motor is superior in silent running properties, vibration-damping properties, insulating properties and maintainability and is capable of easily performing automated production because of compact size, its demand has been rapidly increased.
A molded stator of a molded motor, which has hitherto been used as A.C. motor, brushless D.C. motor and the like, generally has a construction, for example, disclosed in Japanese Laid-Open Patent Publication No. 1-214740. The molding material used herein contains a thermoplastic resin (e.g. polyethylene terephthalate, polyethylene, polypropylene, nylon, etc.) or a thermosetting resin (e.g. unsaturated polyester, vinyl ester resin, phenol resin, etc.) as a binder and further contains an additive (e.g. calcium carbonate, talc, carbon black, etc.).
The issue on wastes has become more serious and the urgent development of a volume-reduction technique and a disposal technique for reuse of discarded thermosetting compositions or molded articles of molding materials is required. Particularly, a large amount of fiber-reinforced unsaturated polyester resins are used for the production of fishing boats, tanks or large products such as housing materials and, therefore, problems about decomposition and regeneration treatment of wastes are serious. The molding materials comprising a thermosetting resin as a binder are exclusively used as a structural material because of magnification
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Onishi Hiroshi
Terada Takahiko
Yamagata Yoshikazu
Matsushita Electric Industrial Co Ltd.
Michl Paul R.
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