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Composition for synthetic resin composition and formed resin magnet

A technology of synthetic resin and magnetic body, which is applied in the field of resin magnetic body and synthetic resin magnetic body composition, and can solve problems such as under-injection and poor flow characteristics of resin compound melt

Inactive Publication Date: 2004-01-21
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a problem arising from the latter is that, if the amount of rare earth magnetic powder used can satisfy the desired magnetic force, the melt flow characteristics of the resin composite are relatively poor.
Highly filled resin mixtures can easily lead to undershot when molded into small magnetic rolls

Method used

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  • Composition for synthetic resin composition and formed resin magnet
  • Composition for synthetic resin composition and formed resin magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Magnetic powder having an average particle diameter of 100 μm can be produced by pulverizing General Motors Inc. with a composition of Nd 12 Fe 78 co 4 B 6 (Atomic weight %) Nd-based rare earth alloy "MQP-B" to prepare.

[0056] The magnetic powder can be surface-treated with "A1100" type silane coupling agent manufactured by Nippon Unicar Co., Ltd.

[0057] The following components were used at 250°C using "LaboPlastomill, Model 50C150" manufactured by Toyo Seiki Co., Ltd. (capacity 60cm 3 ), mixed for 15 minutes at a rotational speed of 50 rpm. Magnetic powder: 188 g (above); Nylon-12: "P 3012 U" 6.8 g, produced by Ube Industries. Ltd.; antioxidant: "IRGANOX MD 1024" 3.5 g, produced by Ciba Specialty Chemicals K.K.; aliphatic polyamide: "PA - 30L" 1.7g, manufactured by Fuji Kasei Co., Ltd. Thus, the synthetic resin magnetic composition according to the 1st invention and the 2nd invention of this application can be obtained. During melt mixing, changes in melt t...

Embodiment 2

[0062] The surface-treated magnetic powder was prepared with the following components. Sr ferrite: "NF110" 50.00kg, produced by Nippon Bengara Kogyo Co., Ltd.; Ba ferrite: "DNP-S" 20.55kg, produced by Nippon Bengara Kogyo Co., Ltd.; silane coupling agent: " A1100" 0.71kg, produced by Nippon Unicar Co., Ltd.

[0063] The resulting magnetic powder was mixed with the following components by a twin-screw mixer. Nylon-6: "P1010" 12.5 kg, produced by Ube Industries. Ltd.; antioxidant: "IRGANOX" 0.42 kg, produced by Ciba Specialty Chemical K.K.; aliphatic polyamide: "PA-30L" 0.42 kg, Fuji Kasei Co., Ltd. . Production; the obtained mixture is made into particles of the synthetic resin magnetic body composition of the first invention of the present application.

[0064] The melt flow rate (MFR) of the obtained synthetic resin magnetic composition was measured using a melt indexer (manufactured by Toyo Seiki Co., Ltd.). The MFR was found to be 156.84 g / 10 min (270°C, 5 kgf), a value ...

Embodiment 3

[0068] Magnetic powder with an average particle diameter of 50 μm can be composed of Nd by crushing 12 Fe 78 co 4 B 6 (atomic weight %) of a Nd-based rare earth alloy (“MQP-B”, having an average particle diameter of 50 μm, produced by General Motors Inc.). The magnetic powder was surface-treated with a "A1100" type silane coupling agent manufactured by Nippon Unicar Co., Ltd. The following components are mixed with a single-screw mixer, magnetic powder: 1880 g (above); Nylon-12 as a binder: 120 g, "P 3012U" produced by Ube Industries.Ltd; N, N'-di[3 - (3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hydrazine (hindered powder antioxidant): 50 g, type "IRGANOX MD1024" produced by Ciba Specialty Chemicals K.K.

[0069] The resulting mixture was made into pellets of the desired resin mixture (pellet shape) with plastic magnetic bodies. The resulting resin composite was found to have an MFR of 185 g / 10 min (250° C., 5 kgf). The synthetic resin magnetic body composition was injec...

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Abstract

A composition for synthetic resin magnets (such as magnet rollers for electrophotography process) which is composed of a resin binder and a magnetic powder mixed and dispersed therein. The resin compound has improved melt flow rate because the binder contains a thermoplastic and an aliphatic polyamide. Owing to its improved melt flow rate, the resin compound can be incorporated with a large amount of magnetic powder without deterioration in moldability. Thus the resulting plastic magnet has a strong magnetic force. In addition, the composition for synthetic resin magnets may be incorporated with a hindered phenol antioxidant, so that it is molded at a higher temperature (120-180 DEG C.) than usual to achieve the same object as mentioned above.

Description

technical field [0001] The present invention relates to a synthetic resin magnetic body composition and a molded resin magnetic body. The resin composite is composed of a resin binder and magnetic powder mixed and dispersed therein. This resin compound is suitable as a raw material for molding plastic magnetic bodies, such as magnetic rollers, which are used in electronic cameras and electrostatic recorders. Background technique [0002] Copiers and printers based on the principle of electrophotography or electrostatic recording are well known to use a developing roller to develop an electrostatic latent image formed on a latent image carrier such as a photosensitive roller. The developing roller consists of a rotating sleeve and a magnetic roller placed in it. The magnet roller is a molded plastic magnet with a specified magnetization. The developing roller magnetizes magnetic developer (or toner) and transports it onto the latent image carrier by so-called jumping. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/09H01F1/08
CPCH01F1/083G03G15/0921
Inventor 河野耕太大福英治
Owner BRIDGESTONE CORP
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