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Stable type stainless steel feed for injection molding and preparation method of stable type stainless steel feed

An injection molding, stainless steel technology, used in metal processing equipment, transportation and packaging, etc., can solve the problems of loss of economy, low cycle life, and different formulation components of injection molding products, reducing feeding costs and improving Flow performance, the effect of reducing harmful gases

Inactive Publication Date: 2018-04-03
KUNSHAN NANO NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, as far as the stainless steel feed used in the injection molding process is concerned, the quality and stability of the imported feed (such as BASF, etc.) in the industry is better than that of the domestic feed, but its high price makes the injection molding product uneconomical, and there is a cycle The problem of low service life; and the domestic feed materials on the market also have problems such as high price, different formula components, low cycle life, and unstable quality.

Method used

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  • Stable type stainless steel feed for injection molding and preparation method of stable type stainless steel feed
  • Stable type stainless steel feed for injection molding and preparation method of stable type stainless steel feed
  • Stable type stainless steel feed for injection molding and preparation method of stable type stainless steel feed

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Add 88 parts of 316L water-vapor combined atomized powder (D90 is 26um) into the mixing chamber of the banburying-granulation machine and preheat while stirring. The preheating temperature is 110°C and the stirring speed is 15r / min, the warm-up time is 5min;

[0046](2) 0.4 parts of polyethylene wax, 0.3 parts of stearic acid, 0.2 parts of ethylene-octene elastomer, 0.125 parts of tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate ] pentaerythritol ester, 0.125 parts of didodecyl thiodipropionate or bis(3,5-di-tert-butylphenyl) pentaerythritol diphosphite, 0.25 parts of bis 2,2,6,6- Tetramethylpiperidinol ester was added to the high-speed mixer and mixed at a high speed. The speed of the high-speed mixer was 800rmp, the mixing temperature was 40°C, and the mixing time was 3min;

[0047] (3) Add 9.0 parts of polyoxymethylene copolymer, 1.0 parts of high-density polyethylene, and 0.6 parts of ethylene-vinyl acetate copolymer into a high-speed mixer for high-...

Embodiment 2

[0052] (1) Add 93 parts of 17-4PH gas atomized powder (D90 is 20um) into the mixing chamber of the banburying-granulating machine and preheat while stirring. The preheating temperature is 120°C and the stirring speed is 10r / min, the warm-up time is 8min;

[0053] (2) Add 0.3 part of microcrystalline wax, 0.2 part of pentaerythritol stearate, 0.1 part of thermoplastic polyurethane elastomer, 0.1 part of β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate Carbon alcohol ester, 0.1 part of tris(2,4-di-tert-butylphenol) phosphite, 0.2 part of poly[1-(2'-hydroxyethyl)-2,2,6,6-tetramethyl-4 -Hydroxypiperidine succinate was added to a high-speed mixer and mixed at a high speed. The speed of the high-speed mixer was 600rmp, the mixing temperature was 50°C, and the mixing time was 5min;

[0054] (3) Add 5.0 parts of polyoxymethylene copolymer, 0.7 parts of polypropylene, and 0.3 parts of maleic anhydride grafted polypropylene copolymer to a high-speed mixer for high-speed mixing. The sp...

Embodiment 3

[0059] (1) Add 92 parts of 316L gas-atomized powder (D90 is 18um) into the mixing chamber of the banburying-granulating machine and preheat while stirring. The preheating temperature is 130°C and the stirring speed is 20r / min , the warm-up time is 10min;

[0060] (2) Add 0.1 part of polyester wax, 0.1 part of ethylene bis stearamide, 0.15 part of EPDM rubber / polypropylene elastomer, 0.025 part of triethylene glycol bis[β-(3-tert-butyl -5-methyl-4-hydroxyphenyl) propionate], 0.025 parts of bis(3,5-di-tert-butylphenyl) pentaerythritol diphosphite, 0.05 parts of poly-{[6-[(1, 1,3,3-tetramethylbutyl)-amino]1,3,5,-triazine-2,4-diyl][(2,2,6,6-tetramethylpiperidinyl) -imino]-1,6-hexanediyl-[(2,2,6,6-tetramethylpiperidinyl)-imino]} into the high-speed mixer and mix at high speed The speed of the machine is 1000rmp, the mixing temperature is 60°C, and the mixing time is 4min;

[0061] (3) Add 7.35 parts of polyoxymethylene copolymer, 0.1 part of high-density polyethylene, and 0.1 pa...

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Abstract

The invention discloses stable type stainless steel feed for injection molding and a preparation method of the stable type stainless steel feed, and belongs to the technical field of stainless steel injection molding. The stable type stainless steel feed for the injection molding is prepared by the following components of, by weight, 88-93 parts of stainless steel powder, 5-9 parts of kemata, 0.1-1 part of hardening agent, 0.1-0.6 part of compatibilizer, 0.1-0.4 part of lubricant, 0.1-0.3 part of dispersing agent, 0.1-0.2 part of toughening agent and 0.1-0.5 part of stabilizer, and the stabletype stainless steel feed is formed by adding the components to banburying equipment in different orders and blending. The stainless steel feed has excellent liquidity and stability, the number of recycling of the stainless steel feed in the injection molding is increased, a degraded material through multiple times of recycling still has stable liquidity, after the stainless steel feed is injectedinto a green body and is sintered, a product has the characteristics like stable performance and sintered density, the waste of raw materials in use is reduced, and the cost of an MIM piece can be lowered and the yield of an MIM product can be increased substantially.

Description

Technical field: [0001] The invention relates to a stable stainless steel feeding material for injection molding and a preparation method thereof, belonging to the technical field of metal injection molding. Background technique: [0002] Metal injection molding (Metal injection Molding, MIM) is a kind of metal powder and binder mixed under certain conditions, then extruded and granulated into feed, and then the feed is injected into the mold to form the required shape. product method. Among them, the binder is a mixture of multiple groups of high molecular polymers, and its viscosity endows the feed with fluidity characteristics, which contributes to the uniformity of forming, cavity filling and powder filling. The injection-molded blank is degreased to remove the binder, and then the degreased brown blank is sintered. Some sintered parts may also undergo post-processing, such as heat treatment, polishing, anodizing, PVD, electroplating, machining, etc. Stainless steel in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/22
CPCB22F3/225B22F1/10
Inventor 吕鸿图马春霞晏敏胜胡立峰徐维浓
Owner KUNSHAN NANO NEW MATERIAL TECH
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