Plastic-based binding agent and method for preparing powder injection molding green bodies through same

A powder injection molding and binder technology, applied in the directions of adhesives, wax binders, non-polymer binder additives, etc., can solve the problems of restricting the mass production of powder injection molding products, unsatisfactory filling, poor fluidity, etc. Achieving good processing stability, avoiding decomposition, and good flow properties

Active Publication Date: 2016-04-13
广州有研粉体材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of binder system formulation is often used for metal injection molding of conventional size, but it has poor fluidity in the manufacture of miniaturized, miniaturized and profiled metal and ceramic products, especially for large aspect ratio and wal

Method used

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  • Plastic-based binding agent and method for preparing powder injection molding green bodies through same

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The plastic-based binder in this embodiment is a plastic-based binder for powder injection molding, and consists of the following raw materials in parts by weight: polyoxymethylene 88, modified polylactic acid resin 4, microcrystalline wax 4, pentaerythritol stearate 2. Dibutyl sebacate 1.5, antioxidant 0.5. Preparation method: put all the raw materials into a high-speed mixer and mix for 30 minutes, and discharge; put the mixed raw materials into a granulator to extrude and granulate to obtain a granular binder.

[0026] The method in which the plastic-based binder of this embodiment is used to prepare the green body has the following steps:

[0027] Step 1: Feed preparation: preheat 17-4PH stainless steel metal powder with a particle size of D50≤10μm to 190°C, stir at a speed of 5r / min; add the said Binder, banburying at 190°C, mixing time is 1 hour, stirring, rotating speed is 10r / min; cooling down to 180°C, continuing banburying for 0.5 hour, stirring, rotating spe...

Embodiment 2

[0033] The plastic-based binder in this embodiment is a plastic-based binder for powder injection molding, and consists of the following raw materials in parts by weight: polyoxymethylene copolymer 82, modified polylactic acid resin 5, microcrystalline wax 5, pentaerythritol stearate 4.5, dibutyl sebacate 3, antioxidant 0.5. Put all the raw materials into a high-speed mixer and mix for 20 minutes, and discharge; put the mixed raw materials into a granulator to extrude and granulate to obtain a granular binder.

[0034] The method in which the plastic-based binder of this embodiment is used to prepare the green body has the following steps:

[0035] Step 1: Feed preparation: preheat 316L stainless steel metal powder with a particle size of D50≤10μm and D90=22 to 185°C, stir at a speed of 10r / min; add in a volume ratio of binder to metal powder of 36:64 The binder is banburyed at 185°C, the banburying time is 40 minutes, stirring, and the rotating speed is 20r / min; the temperat...

Embodiment 3

[0039] The plastic-based binder in this embodiment is a plastic-based binder for powder injection molding, and consists of the following raw materials in parts by weight: polyoxymethylene copolymer 76, modified polylactic acid resin 8, microcrystalline wax 6, pentaerythritol stearate 2. Dibutyl sebacate 7. Antioxidant 1. Put all the raw materials into a high-speed mixer and mix for 30 minutes, and discharge; put the mixed raw materials into a granulator to extrude and granulate to obtain a granular binder.

[0040] The method in which the plastic-based binder of this embodiment is used to prepare the green body has the following steps:

[0041]Step 1: Feed preparation: Preheat the ZrO2 ceramic powder with a particle size of D50≤0.85μm to 180°C, stir at a speed of 5r / min; add the binder according to the volume ratio of the binder to the metal powder at 46:54 Binder, banburying at 180°C, mixing time is 1 hour, stirring, rotating speed is 30r / min; cooling to 180°C, continuing ba...

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Abstract

The invention discloses a plastic-based binding agent and a method for preparing powder injection molding green bodies through the same. The plastic-based binding agent is prepared from, by weight, 75-88% of polyoxymethylene, 4-10% of modified polylactic resin, 3-10% of microcrystalline wax, 2-8% of pentaerythritol stearate, 1-10% of sebacic acid dibutyl ester and 0.5-2% of an antioxidant. The method for preparing powder injection molding green bodies through the plastic-based binding agent comprises the steps that metal or ceramic powder is preheated and stirred; the binding agent is added and banbury mixing is performed; after banbury mixing is performed, extrusion and pelleting are performed to obtain granular feed; injection molding of the granular feed is performed; green bodies obtained through injection molding are catalyzed and degreased through nitric acid, and the powder injection molding degreased green bodies are obtained. The adopted plastic-based binding agent is low in viscosity and good in flowing performance during injection molding, and the good mold filling capacity and the good green body stability are achieved; the plastic-based binding agent can be widely applied to the powder injection molding industry, and the plastic-based binding agent is particularly applicable to production of parts with the large draw ratio, small wall thickness, micro size and complex three-dimensional shapes.

Description

technical field [0001] The invention relates to a plastic-based binder for powder injection molding and a method for preparing green body thereof, which can be widely used in the powder injection molding industry, especially suitable for large aspect ratio, thin wall thickness, small size and three-dimensional The production of parts with complex shapes belongs to the technical field of powder injection molding. Background technique [0002] Powder injection molding is the use of polymer organic matter as a binder, making full use of its melting and rheological properties when heated to a certain temperature, similar to injection plastics, to form a mixture of powder and binder into various desired shapes Then use chemical or thermal decomposition methods to remove the binder in the formed blank, and finally obtain the final product through sintering and densification and necessary subsequent processing procedures. This technology has unique advantages in preparing high-pre...

Claims

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Application Information

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IPC IPC(8): C09J159/04C09J167/04C09J191/06C09J11/06B22F3/115
CPCB22F3/115C08L2205/03C09J11/06C09J159/04C08L67/04C08L91/06C08K5/103C08K5/11C08K5/1345C08K5/526
Inventor 翁廷罗浩曾克里周晚珠马宇平宗伟冷丹朱杰李志王苏英屈娇李聪
Owner 广州有研粉体材料科技有限公司
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