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Catalysis degreasing type adhesive for powder injection moulding and preparation of material feeding thereof

A technology of powder injection molding and catalytic degreasing, applied in the direction of adhesives, etc., can solve the problems of high production cost, achieve low cost, promote wide application, and simple preparation

Inactive Publication Date: 2009-01-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a catalytic degreasing binder for powder injection molding and its feeding material in view of the fact that the current PIM industrial production can only rely on imported catalytic degreasing feedstock and the production cost is expensive. preparation method to reduce the cost of using catalytic degreasing technology, thereby promoting the wide application of catalytic degreasing technology in PIM industrial production

Method used

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  • Catalysis degreasing type adhesive for powder injection moulding and preparation of material feeding thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] A catalytic degreasing binder suitable for 17-4PH stainless steel powder injection molding, which consists of the following components (volume percentage ratio): 89% polyoxymethylene 100P, 5% high-density polyethylene, 3% paraffin, 1% ethylene-vinyl acetate copolymer (EVA) with a vinyl acetate (VA) content of 26, 1% dibutyl phthalate, 1% zinc stearate.

[0040] Such as figure 1 Shown, the preparation method of the present embodiment comprises the following steps:

[0041] (1) 89% polyoxymethylene 100P, 5% high-density polyethylene, 1% ethylene-vinyl acetate copolymer (EVA) with a vinyl acetate (VA) content of 26, and 17-4PH with a powder loading of 62% The stainless steel powder was added into a three-dimensional rotator and dry mixed for 1 hour to obtain a uniform mixture of powder and binder.

[0042] (2) Put the above homogeneous mixture into the internal mixer, raise the temperature to 185°C, and knead for 30 minutes.

[0043] (3) Reduce the mixing temperature to...

Embodiment 2

[0046] A catalytic degreasing binder suitable for zirconia ceramic powder injection molding, which consists of the following components (volume percentage ratio): 90% polyoxymethylene 500P, 4% high-density polyethylene, 3% paraffin, 1 Ethylene-vinyl acetate copolymer (EVA) with a % vinyl acetate (VA) content of 24, 1.5% dibutyl phthalate, 0.5% zinc stearate.

[0047] The preparation method of this embodiment:

[0048] (1) 90% polyoxymethylene 500P, 4% high-density polyethylene, 1% ethylene-vinyl acetate copolymer (EVA) with a vinyl acetate (VA) content of 24, and zirconia ceramics with a powder loading of 53% The powder was added to a three-dimensional rotator and dry mixed for 1 hour to obtain a uniform mixture of powder and binder.

[0049] (2) Put the above homogeneous mixture into the internal mixer, raise the temperature to 190°C, and knead for 25 minutes.

[0050] (3) Reduce the mixing temperature to 165°C, then add 3% paraffin, 1.5% dibutyl phthalate and 0.5% stearic ac...

Embodiment 3

[0053] A catalytic degreasing binder suitable for YG12 hard powder injection molding, which consists of the following components (volume percentage ratio): 89% polyoxymethylene 100P, 5% high-density polyethylene, 3% paraffin, 1 Ethylene-vinyl acetate copolymer (EVA) with a vinyl acetate (VA) content of 26%, 1% dibutyl phthalate, 1% zinc stearate.

[0054] The preparation method of this embodiment:

[0055] (1) 89% homopolyoxymethylene 100P, 5% high-density polyethylene, 1% ethylene-vinyl acetate copolymer (EVA) with a vinyl acetate (VA) content of 26, and YG12 rigid with a powder loading of 56% The powder was added to a three-dimensional rotator and dry mixed for 1 hour to obtain a uniform mixture of powder and binder.

[0056] (2) Put the above homogeneous mixture into the internal mixer, raise the temperature to 185°C, and knead for 30 minutes.

[0057] (3) Reduce the mixing temperature to 170°C, then add 3% paraffin wax, 1% dibutyl phthalate and 1% stearic acid into the i...

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Abstract

The invention discloses a catalytic degreasing type binder used for powder injection molding and feedstock preparation method; the catalytic degreasing type binder used for powder injection molding consists of polyoxymethylene homopolymer, high-density polyethylene and paraffin wax, as well as compatibilizer, plasticizer, and surfactant, with the volume percentage thereof as follows: 85 to 95 percent of polyoxymethylene homopolymer, 4 to 9 percent of high-density polyethylene, 3 to 6 percent of paraffin wax, 0.5 to 1 percent of compatibilizer, 1 to 2 percent of plasticizer, and 0.5 to 1 percent of surfactant. According to the binder ratio and a certain powder load, the binder and the powder are added into an internal mixer so as to undertake mixing and prepare catalytic degreasing type feedstock. The catalytic degreasing type binder used for powder injection molding and feedstock preparation method overcome the shortage that only the imported catalytic degreasing type feedstock can be applied in the current PIM industrial production and thus causing the production cost to be expensive, thereby reducing the cost of using the catalytic degreasing technology and promoting the extensive application thereof in the PIM industrial production.

Description

technical field [0001] The invention relates to a catalytic degreasing type binder for powder injection molding and a preparation method thereof. Background technique [0002] Powder injection molding (Powder Injection Molding, referred to as PIM) technology has the characteristics of one-time forming complex shape products, high dimensional accuracy, no need for machining or only micro-processing, easy to realize production automation and excellent product performance. One of the hottest parts forming technologies today." However, the degreasing process in the powder injection molding process is time-consuming, has many defects, and the process is difficult to control. These are the most difficult and critical factors in the PIM process, and they are still the bottleneck of the development of the PIM industry. Degreasing and binder are closely related, and the binder determines the degreasing method. Therefore, in order to improve the competitiveness of powder injection m...

Claims

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Application Information

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IPC IPC(8): C09J159/02B29B7/00B29B7/10B29K59/00B29K23/00B29K91/00
Inventor 李笃信郑礼清李昆卢仁伟赵莉
Owner CENT SOUTH UNIV
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