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Binder for injection molding

An injection molding and bonding agent technology, which is applied in the field of bonding agents for metal powder or ceramic powder injection molding, can solve the problems of incomplete mold, inconsistent rate of thermal decomposition, affecting compatibility, etc., to extend the temperature range and reduce defects. Chance, the effect of improving compatibility

Active Publication Date: 2017-11-03
CHENMING MOLD IND CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the polymers used in multi-component binders usually have the characteristics of crystalline (such as polyoxymethylene (POM)) and amorphous (polyethylene (polyethylene, PE)), because of the difference in properties and structure The difference affects the compatibility between each other, resulting in uneven composition of the binder
Such inhomogeneity will cause (1) lack of good fluidity of the material to be molded, increase the time required for the manufacturing process, and in the case of complex injection molded parts, even cause incomplete mold filling; and (2) In the subsequent degreasing process, the injection-molded green embryo will have defects (such as deformation) due to the inconsistent rate of thermal decomposition

Method used

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Embodiment Construction

[0020] The first embodiment of the present invention provides a five-component binder composition for injection molding, which may contain polyolefins with maleic anhydride groups, polyolefin compounds, polyoxymethylene, hard Fatty acids and waxes. In this embodiment, the average molecular weight of the polyolefin bearing maleic anhydride groups may be from about 90,000 to about 110,000, preferably about 100,000. The polyolefin compound may comprise high density polyethylene (HDPE) having a density of about 0.950 to about 0.965 g / cm3 or low density polyethylene (LDPE) having a density of about 0.915 to about 0.930 g / cm3, preferably HDPE . The wax can be selected from the group consisting of paraffin wax, beesicum wax, carnauba wax, microcrystalline wax and combinations thereof, preferably, but not limited to, the group consisting of paraffin wax, microcrystalline wax and combinations thereof.

[0021] According to this first embodiment, the polyolefin with maleic anhydride g...

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Abstract

The present invention provides a binder for injection molding which comprises from about 3 to about 20% by weight of a polyolefin with a maleic anhydride group, from about 30 to about 40% by weight of a polyolefin compound, from about 5 to about 20% by weight of polyoxymethylene, from about 1 to about 5% by weight of stearic acid and from about 35 to about 60% by weight of wax. The binder for injection molding of the present invention is characterized in that the polyolefin with the maleic anhydride group is bonded with the polyolefine compound and polyoxymethylene to improve the compatibility between the binder components and extend the thermal cracking time, to reduce the defects of the object to improve the accuracy of its size and consistency of the effect.

Description

technical field [0001] The invention relates to a bonding agent for injection molding, especially a bonding agent for metal powder or ceramic powder injection molding. Background technique [0002] Powder injection molding is a part manufacturing technology that combines plastic injection molding and powder technology, which can be divided into metal powder injection molding (Metal Injection Molding, MIM) and ceramic powder injection molding (Ceramic Injection Molding, CIM) Two major application areas, this technology has the advantages of good surface condition, fast molding cycle, high precision and uniform quality, suitable for mass production of complex shapes and can reduce subsequent processing, etc., so it has been widely valued by the industry. The basic steps of powder injection molding are to add metal powder or ceramic powder to the binder, use the binder as the carrier, mix (blending) at an appropriate temperature to form the material to be shaped, and then injec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/22C04B35/632C04B35/634
CPCC04B35/632C04B35/63408C04B35/63472C04B35/63496B22F3/225B22F1/103B22F1/10
Inventor 谢曙旭
Owner CHENMING MOLD IND CORP
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