Injection molding composition

A technology of injection molding and composition, which is applied in the direction of transportation and packaging, metal processing equipment, etc., can solve the problems that the heating and degreasing time must be more than 48 hours, and satisfactory degreasing body cannot be obtained.

Inactive Publication Date: 2012-02-15
IHI CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the binder decomposes rapidly between 300°C and 400°C, when degreasing a molded body with a large wall thickness, there is a problem that a satisfactory degreased body cannot be obtained if the heating degreasing time is not prolonged. (For example, when the wall thickness of the molded body exceeds 7mm, the heating degreasing time must be 48 hours or more)

Method used

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  • Injection molding composition
  • Injection molding composition
  • Injection molding composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In the pressurized kneader, first, put polylactic acid, polyoxymethylene and polypropylene, and after melting at 180°C, put in SUS316L powder (average particle size: 10μm), paraffin wax (melting point 63°C), polypropylene wax and methyl Glycidyl acrylate was kneaded for 40 minutes, and the kneaded product was taken out and pulverized to obtain a molding composition. Next, injection was performed at a molding temperature of 150° C. to obtain a molded body having a thickness of 3 mm, a width of 10 mm, and a length of 60 mm.

[0030] Molding composition

[0031] SUS316L powder 100 parts by weight (58 volume%)

[0032] Total binder amount 7.8 parts by weight (42 volume %)

[0033] Binder composition

[0034] (a) Polylactic acid 15.0% by volume

[0035] (b) Polyoxymethylene 10.0% by volume

[0036] (Vicat softening point is 157°C)

[0037] (c) Polypropylene 15.0% by volume

[0038] (Vicat softening point is 137°C)

[0039] (d) Paraffin 40.0% by volume

[0040] (V...

Embodiment 2

[0046] In the pressurized kneader, first, put polylactic acid, polyoxymethylene and polypropylene, and after melting at 180°C, put in SUS304 powder (average particle size: 12μm), paraffin wax (melting point 46°C), carnauba wax and polyformaldehyde Butyl acrylate was kneaded for 40 minutes, and the kneaded product was taken out and pulverized to obtain a molding composition. Next, injection was performed at a molding temperature of 170° C. to obtain a molded body having a thickness of 3 mm, a width of 10 mm, and a length of 60 mm.

[0047] Molding composition

[0048] SUS304 powder 100 parts by weight (60 volume%)

[0049] Total binder amount 7.8 parts by weight (40 volume %)

[0050] Binder composition

[0051] (a) Polylactic acid 15.0% by volume

[0052] (b) Polyoxymethylene 15.0% by volume

[0053] (Vicat softening point is 157°C)

[0054] (c) Polypropylene 10.0% by volume

[0055] (Vicat softening point is 137°C)

[0056] (d) Paraffin 40.0% by volume

[0057] (V...

Embodiment 3

[0063] In the pressurized kneader, first, put polylactic acid, polyoxymethylene and polypropylene at 180 ° C, and after melting, put iron-nickel 8% powder (average particle size: 8 μm), glycidyl methacrylate, paraffin ( melting point of 63° C.) and carnauba wax were kneaded for 40 minutes, and the kneaded product was taken out and pulverized to obtain a molding composition. Next, injection was performed at a molding temperature of 160° C. to obtain a molded body having a thickness of 3 mm, a width of 10 mm, and a length of 60 mm.

[0064] Formed body composition

[0065] Iron-nickel 8% powder 100 parts by weight (55 volume %)

[0066] Total binder amount 7.0 parts by weight (45 volume %)

[0067] Binder composition

[0068] (a) Polylactic acid 15.0% by volume

[0069] (b) Polyoxymethylene 15.0% by volume

[0070] (Vicat softening point is 157°C)

[0071] (c) Polypropylene 15.0% by volume

[0072] (Vicat softening point is 137°C)

[0073] (d) Paraffin 40.0% by volum...

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Abstract

Disclosed is an injection molding composition which has high thermal decomposability and rarely suffers from degreasing deformation when heated. The injection molding composition is capable of providing a good degreased body in a short time even in cases where a molded body has a large thickness. Specifically disclosed is an injection molding composition which is composed of a sinterable metal powder and an organic binder. The injection molding composition is characterized in that the organic binder is composed of (a) a polylactic acid, (b) a polyoxymethylene, (c) a polypropylene, (d) an organic compound having a viscosity at 150 DEG C of not more than 200 mPas, and (e) a thermoplastic resin having a Vicat softening point of not more than 130 DEG C.

Description

technical field [0001] The present invention relates to an injection molding composition used in metal powder injection molding. Background technique [0002] In recent years, in order to manufacture metal products with complex shapes, injection molding has been used. In this injection molding method, various organic compounds and thermoplastic resins are added to make the metal powder fluid, and after heating and kneading, injection molding is performed as a raw material for molding, and the obtained molded body is degreased / sintered to obtain Sintered products. Injection molding compositions that have been used so far, those in which metal powders are used, in many cases, use polyethylene, polypropylene, methacrylate copolymers, and ethylene-vinyl acetate copolymers as high Molecular compound, using paraffin wax, carnauba wax, etc. as a low molecular weight compound to make a binder. [0003] However, when these binders are used, since the degreasing rate is low unless ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/02B22F3/10C08K5/00C08L23/10C08L59/00C08L67/04C08L101/00B22F1/10
CPCB22F2999/00C08K3/08C08L23/10C08L33/08C08L59/02C08L67/04C08L71/02C08L101/00C08L2205/035B22F1/10C08L2666/02B22F1/103B22F3/225
Inventor 寒川喜光中川胜则
Owner IHI CORP
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