High-cycle-use feedstock for metal-power injection molding (MIM) and preparation method thereof

A metal powder and injection molding technology, which is used in the field of high-recycling feeding and its preparation for metal powder injection molding, can solve the problems of hardening and brittleness, difficulty in degreasing products, and decreased fluidity, and achieves high degreasing rate and injection molding technology. Stable, high-cycle effect

Pending Publication Date: 2019-05-24
深圳市众德祥科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since this technology currently produces a large amount of nozzle material in the actual injection molding stage, the total composition of the binder in the metal powder injection molding feed, which is mainly composed of polymer substrates, has a decisive impact on determining the cycle life of the nozzle material. ; At present, after a relatively high number of cycles of metal powder injection molding feed materials on the market, especially for parts with a relatively large nozzle ratio, it generally leads to hardening and brittleness of the feeding material itself during later use. Problems such as decline, product degreasing difficulty, etc.

Method used

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  • High-cycle-use feedstock for metal-power injection molding (MIM) and preparation method thereof
  • High-cycle-use feedstock for metal-power injection molding (MIM) and preparation method thereof
  • High-cycle-use feedstock for metal-power injection molding (MIM) and preparation method thereof

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Experimental program
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Effect test

preparation example Construction

[0031] Therefore, a preparation method based on the above-mentioned control group 1 comprises the following steps:

[0032] (1) Mixing: Add each component into a high-speed mixer and mix according to the above formula. The speed of the high-speed mixer is set at 300-600r / min, and the mixing time is 5-15min.

[0033] (2) Internal mixing and granulation: set the temperature of the internal mixer to 170-185°C, and the screw speed to 60-90r / min. After the system is melted, transfer the feed to the internal mixer for granulation.

[0034] Control group 2

[0035] The total components of the binder of the control group 2 are as follows according to the following formula, and are calculated as the following components in terms of weight percentage: acetal copolymer 85wt.%, TPU+TPE 2wt.%, LDPE 6wt.%, antioxidant 1wt.%, polyethylene Wax 3wt.%, Pentaerythritol stearic acid 3wt.%.

[0036] In this control group, polyoxymethylene copolymer without special end-capping treatment was selecte...

Embodiment 1

[0041] According to the following formula, the total components of the binder are calculated as the following components in terms of weight percentage: 85wt.% of polyoxymethylene, 2wt.% of TPU+TPE, 6wt.% of LDPE, 1wt.% of antioxidant, modified amide wax 3wt.%, pentaerythritol ester stearic acid 3wt.%. A hindered phenolic bisphenol antioxidant is used as an antioxidant. This hydrogen-donating antioxidant is very stable because the single electron in the generated phenoxy radical can be conjugated with the large π system of the aromatic ring.

[0042] The present invention adopts polyoxymethylene after special end-capping treatment, adopts LDPE and TPU+TPE as the material skeleton, and can also make the adhesive base material have certain shape retention and toughness. Auxiliary antioxidants are phosphite antioxidants, whose main function is to prevent or delay the free radicals generated during the oxidation process.

[0043] In this case, the compounding ratio of main and aux...

Embodiment 2

[0048] According to the following formula, the total components of the binder are calculated as the following components by weight percentage: 85wt.% of polyoxymethylene, 2wt.% of TPU+TPE, 6wt.% of LDPE, 1wt.% of antioxidant, and 0.5wt of absorbent %, modified amide wax+EVA3wt.%, pentaerythritol ester stearic acid 2.5wt.%.

[0049] In this case, a parallel twin-screw extruder is selected. Due to the large diameter of the screw in the feeding section of this type of extruder, it plays a very good role in the heat transfer, shearing and plasticization of the material. At the same time, meshing co-rotating twin-screws are used in the design of the twin-screws, which can make the residence time of the materials in the screws narrower and help to improve the thermal stability of the feed. At the same time, the design of the twin-screw adopts the twin-screw of meshing type and rotates in the same direction, and the plasticizing effect of two or more positive meshing blocks is better...

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Abstract

The invention discloses a high-cycle-use feedstock for metal-power injection molding (MIM) and a preparation method thereof. The high-cycle-use feedstock is prepared from binding agent total components and a metal power component according to the formula proportion; the binding agent total components is prepared from the components in percentage by weight: 80-90wt.% of copolyoxymethylene, 2-10wt.%of backbone high polymer, 2-5wt.% of thermoplastic elastomer, 0.1-3wt.% of an antioxidant, 0.1-1wt.% of an absorbing agent, 0.1-5wt.% of a compatilizing agent and 0.1-5wt.% of a coupling agent; and the weight percentage of the binding agent total components to the metal power component is 1to (10-11). The preparation method comprises the step of extruding and granulating through a double-screw extruding machine. According to the high-cycle-use feedstock for MIM and the preparation method thereof, optimization is carried out from the angle of the binding agent and the angle of the equipment technology, the cycle use life of the feedstock is prolonged, through a test, the color of the surface of a workpiece which is subjected to injection molding by the high-cycle-use feedstock is uniform and has no dark lines and flow lines, meanwhile, the number of times of cycle of a drainage opening material is much, the degreasing rate at the later stage is high and can maintain at a certain stablelevel, and no desirable influence occurs to the appearance of a product.

Description

technical field [0001] The invention relates to the technical field of metal powder injection molding (MIM), in particular to a high-cycle feed material for metal powder injection molding and a preparation method thereof. Background technique [0002] Metal powder injection molding is a brand-new parts processing technology formed by introducing plastic injection molding technology into the field of powder metallurgy. [0003] Since this technology currently produces a large amount of nozzle material in the actual injection molding stage, the total composition of the binder in the metal powder injection molding feed, which is mainly composed of polymer substrates, has a decisive impact on determining the cycle life of the nozzle material. ; At present, after a relatively high number of cycles of metal powder injection molding feed materials on the market, especially for parts with a relatively large nozzle ratio, it generally leads to hardening and brittleness of the feeding...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00
Inventor 刘相权
Owner 深圳市众德祥科技有限公司
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