CN107866559A - A kind of stable type injection moulding stainless steel feeding and preparation method thereof - Google Patents
A kind of stable type injection moulding stainless steel feeding and preparation method thereof Download PDFInfo
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- CN107866559A CN107866559A CN201711004406.7A CN201711004406A CN107866559A CN 107866559 A CN107866559 A CN 107866559A CN 201711004406 A CN201711004406 A CN 201711004406A CN 107866559 A CN107866559 A CN 107866559A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
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Abstract
The invention discloses a kind of stable type injection moulding stainless steel feeding and preparation method thereof, belong to stainless steel injection molding technology field.The stable type injection moulding of the present invention is made up with stainless steel feeding of the component comprising following parts by weight：88 93 parts of powder of stainless steel, 59 parts of kematal, 0.1 1 parts of hardening agent, 0.1 0.6 parts of compatilizer, 0.1 0.4 parts of lubricant, 0.1 0.3 parts of dispersant, 0.1 0.2 parts of toughener, 0.1 0.5 parts of stabilizer, the present invention are added to each component to be kneaded in banburying equipment and formed according to different order.The stainless steel feeding of the present invention has excellent mobility and stability, improve circulation and stress access times of the stainless steel feeding in injection moulding, and repeatedly circulation and stress regrinding-material still keeps stable mobility, and there is the characteristics such as stable performance and sintered density after being injected into green sintering, reduce the waste that raw material uses, the cost of MIM parts can be greatly lowered and improve the yield of MIM products.
Description
Technical field：
The present invention relates to a kind of stable type injection moulding stainless steel feeding and preparation method thereof, belong to metal injection moulding
Technical field.
Background technology：
Metal injection moulding (Metal injection Molding, MIM) be it is a kind of by metal dust and binding agent one
Extrusion granulator is into feeding after being mixed under fixed condition, then feeding is injected in shapes required for the shaping in mould shape
Method.Wherein, binding agent is the mixture of multigroup high molecular polymer, and its viscosity, which assigns feeding, has mobility feature, and has
Help the uniformity of shaping, mould filling and powder packing.The blank of injection moulding carries out degreasing and excludes binding agent, then to degreasing
Brown base is sintered, and is partially sintered part and is also possible to post processing processing to be carried out, such as heat treatment, polishing, anodic oxidation, PVD, electricity
Plating, machining etc..Stainless steel injection moulding sintered products not only have the complicated shape and high accuracy of injection molding of plastics product
The features such as, while also there is the physics close with forging product, chemistry and mechanical performance.
At present, for stainless steel feeding used in injection molding process, industry import feeding (such as German BASF etc.)
Quality and the more domestic feeding of stability are more preferable, but its it is expensive make injection forming product lose economy, while exist circulation
The problem of service life is low；And there is also price is higher, recipe ingredient differs, service life cycle for domestic feeding on the market
Low, the problems such as quality is unstable.In addition, the stability and service life cycle of injection moulding feeding are joined to injection molding process
Number adjustment, the final mass of product have a major impact, and its technology contents is related to powder of stainless steel and multicomponent macromolecule additive.
Therefore, at present research injection molding process with the stability of stainless steel feeding and improve service life cycle be reduction materials into
Originally, the emphasis of Improving The Quality of Products.
The content of the invention：
The technical problems to be solved by the invention are：A kind of stable type injection moulding stainless steel feeding, Neng Gouyou are provided
Effect improves the mobility and stability of stainless steel feeding reclaimed materials in injection moulding, improves the utilization of product yield and feeding
Rate, and be easy to get using raw material, be cheap, the manufacturing cost of MIM parts can be greatly lowered.
In order to solve the above-mentioned technical problem, the present invention is achieved by the following technical solutions：
A kind of stable type injection moulding stainless steel feeding, is made up of following material according to parts by weight：Powder of stainless steel,
88-93 parts；Kematal, 5-9 parts；Hardening agent, 0.1-1 parts；Compatilizer, 0.1-0.6 parts；Lubricant, 0.1-0.4 parts；Point
Powder, 0.1-0.3 parts；Toughener, 0.1-0.2 parts；Stabilizer, 0.1-0.5 parts.
Preferably, the powder of stainless steel is selected from the one or more of steam combined atomizing powder or aerosolization powder；
Preferably, the powder of stainless steel be selected from 304L stainless steel powders, 316L stainless steel powders, 17-4PH stainless steel powders,
One kind in nickelles stainless steel powder, the particle diameter of the powder of stainless steel is 18 μm -26 μm.
Preferably, the hardening agent is made up of one or both of polyethylene, polypropylene.
Preferably, the compatilizer by ethylene-vinyl acetate copolymer, maleic anhydride grafted polyethylene copolymer,
One or more compositions in maleic anhydride inoculated polypropylene copolymer, maleic anhydride grafted ethene-octene copolymer.
Preferably, the lubricant is by paraffin, Tissuemat E, polyoxyethylene wax, polypropylene wax, polyester wax, microwax
One or more compositions.
Preferably, the dispersant is any of stearic acid dispersant or amide-type dispersant；The tristearin
Acids dispersant is one or several kinds of mixing in stearic acid, calcium stearate, zinc stearate or pentaerythrite stearate
Thing；
Preferably, the amide-type dispersant is that erucyl amide, oleamide or ethylene bis stearamide are a kind of or more
Kind mixture.
Preferably, the toughener is by ethylene-octene copolymer, TPUE, styrene-fourth two
Alkene-styrenic elastomer, ethylene propylene diene rubber/styrenic elastomer, one kind or more of EPT rubber elastomer
Kind mixture.
Preferably, the stabilizer is mixed by antioxidant with hindered amine light stabilizer by weight 1: 1；
Preferably, the antioxidant is mixed by primary antioxidant and synergistic antioxidant by weight 1: 1；
Preferably, the primary antioxidant is four [β-(3,5- di-tert-butyl-hydroxy phenyl) propionic ester] pentaerythrites
Double [the β-(the 3- tert-butyl groups -5- of ester, β-positive octadecanol ester of (3,5- di-tert-butyl-hydroxy phenyl) propionic acid, triethylene-glycol
Methyl -4- hydroxy phenyls) propionic ester] in one or more；
Preferably, the synergistic antioxidant is three (2,4-DTBP) phosphite esters, thio-2 acid double ten
It is more than the one or more in diol ester or double (3,5- di-tert-butyl-phenyl) pentaerythritol diphosphites；
Preferably, the hindered amine light stabilizer is decanedioic acid double 2,2,6,6- tetramethyl piperidine alcohol esters, poly- [1-
(2 '-ethoxy) -2,2,6,6- tetramethyl -4- hydroxy piperidines succinates or it is poly- [6- [(1,1,3,3- tetramethyl butyl) -
Amido] 1,3,5,-triazine -2,4- diyl] [(2,2,6,6- tetramethyl-piperidyl)-imido grpup] -1,6- hexanes diyl-[(2,
2,6,6- tetramethyl-piperidyls)-imido grpup] one or more.
A kind of stable type injection moulding manufacture method of stainless steel feeding, comprises the following steps：
(1) preheated while stirring in the mixing chamber that 88-93 part powder of stainless steel is added in banburying-granulation all-in-one；
(2) by 0.1-0.4 parts lubricant, 0.1-0.3 parts dispersant, 0.1-0.2 parts toughener, 0.1-0.5 part stabilizers
It is added to the mixing of high-speed mixer high speed；
(3) 5-9 parts kematal, 0.1-1 part hardening agents, 0.1-0.6 part compatilizers are added in high-speed mixer
Mix at a high speed；
(4) mixed material obtained in step (2) and step (3) is added in step (1) and be kneaded so that is kneaded
All materials are well mixed in chamber；
(5) material that step (4) obtains is continued to be kneaded 40-50min so that be kneaded all materials in chamber and be thoroughly mixed
After even and not cohesive cavity wall, mixing terminates, and carries out extrusion pelletizing, obtains length as 2-3mm, a diameter of 2-3mm injection moulding
With stainless steel feed pellet.
Preferably, the preheating temperature in the step (1) is 100-130 DEG C, speed of agitator 10-20r/min, preheating
Time is 5-10min；
Preferably, the speed of step (2) high-speed mixer is 600-1000rmp, mixing temperature is 40-60 DEG C,
Incorporation time is 3-5min；
Preferably, the speed of step (3) high-speed mixer is 600-1000rmp, mixing temperature is 40-60 DEG C,
Incorporation time is 3-5min；
Preferably, 110-130 DEG C of melting temperature in the step (4), speed of agitator 30-40r/min, during mixing
Between be 10-20min；
Preferably, 150-180 DEG C of melting temperature in the step (5), speed of agitator 30-40r/min, during mixing
Between be 10-20min；
Preferably, banburying-granulation all-in-one extrusion die temperature is 160-180 DEG C in the step (5), extrusion screw rod
Temperature is 170-200 DEG C, screw speed 15-25HZ, and pelletizing speed is 40-50HZ.
Compared with prior art, usefulness of the present invention is：
1st, mobile performance of the feeding produced by the present invention when part injection moulding can not only be effectively improved, moreover it is possible to improve not
The number that rust steel feeding circulation and stress in injection molding process uses, reduction are recycled back to rewinding and insatiable hunger occur when injecting green compact
Completely, phenomena such as tomography, flow liner, and keep being recycled back to rewinding after green sintering is injected with stable sintered density；
2nd, the raw material that uses of the present invention belong on the market it is conventional, be easy to get raw material at a low price, injection moulding can be greatly lowered
Feeding cost；Each component does not contain the compound for having negative effect to injection molding process and product quality, can be effectively improved MIM
The yield of part；
3. the performance of the green compact of injection moulding of the present invention has good stability during circulation and stress, so as to ensure
The stability of performance after product sintering；
4. the primary antioxidant that the present invention uses compounds with auxiliary anti-oxidant, cooperative effect is produced, effectively prevents copolymerized methanal
The thermal degradation occurred during its melt-processed, it is effective to reduce pernicious gas caused by material mixing and injection moulding；
5. the present invention can effectively improve antioxidant using hindered amine light stabilizer and catch caused by copolymerized methanal thermal degradation
The ability of free radical, so as to interrupt whole autoxidation process, antioxygen stabilization is played, makes feeding in injection molding process
Meet circulation and stress 20 times.
Brief description of the drawings：
The present invention is further described below in conjunction with the accompanying drawings.
Fig. 1 is graphs of a relation of the MFI with circulation and stress number.
Fig. 2 is variation relation figure of the green strength with circulation and stress number Vn (n=0~20).
Fig. 3 is variation relation figure of the sintered density with circulation and stress number Vn (n=0~20).
Embodiment：
Below in conjunction with the accompanying drawings and embodiment the present invention will be described in detail：
In following examples, all raw materials are all in parts by weight.
Embodiment 1
(1) the mixing chamber being added to 88 parts of 316L steam combined atomizings powder (D90 26um) in banburying-granulation all-in-one
In preheat while stirring, preheating temperature be 110 DEG C, speed of agitator 15r/min, preheating time 5min；
(2) by 0.4 part of Tissuemat E, 0.3 part of stearic acid, 0.2 part of ethylene-octene copolymer, 0.125 part four [β-(3,
5- di-tert-butyl-hydroxy phenyls) propionic ester] pentaerythritol ester, the double lauryl alcohol esters or double (3,5- of 0.125 part of thio-2 acid
Di-tert-butyl-phenyl) pentaerythritol diphosphites, double 2,2,6, the 6- tetramethyl piperidine alcohol esters of 0.25 part of decanedioic acid are added to height
Fast mixer high speed mixes, and the speed of high-speed mixer is 800rmp, and mixing temperature is 40 DEG C, incorporation time 3min；
(3) 9.0 parts of kematals, 1.0 parts of high density polyethylene (HDPE)s, 0.6 part of ethylene-vinyl acetate copolymer are added
Mixed to high-speed mixer high speed, the speed of high-speed mixer is 600rmp, and mixing temperature is 50 DEG C, and incorporation time is
4min；
(4) mixed material that step (2) obtains is added in step (1) and be kneaded so that is kneaded all in chamber
Material is well mixed, 110 DEG C, speed of agitator 30r/min, mixing time 15min of melting temperature；
(5) mixed material that step (3) obtains is added in step (4) and be kneaded so that is kneaded all in chamber
Material is well mixed, 160 DEG C, speed of agitator 40r/min, mixing time 10min of melting temperature；
(6) material that step (5) obtains is continued to be kneaded 40min so that be kneaded all materials in chamber and be mixed thoroughly
And not bond cavity wall after, mixing terminates, and carries out extrusion pelletizing, obtain length for 3mm, a diameter of 2mm injection moulding with stainless
Steel feed pellet；Banburying-granulation all-in-one extrusion die temperature is 160 DEG C, and extrusion screw rod temperature is 180 DEG C, and screw speed is
15HZ, pelletizing speed are 50HZ.
Embodiment 2
(1) 93 parts of 17-4PH aerosolizations powder (D90 20um) are added to side in the mixing chamber in banburying-granulation all-in-one
Side preheating is stirred, preheating temperature is 120 DEG C, speed of agitator 10r/min, preheating time 8min；
(2) by 0.3 part of microwax, 0.2 part of pentaerythrite stearate, 0.1 part of TPUE, 0.1 part
β-positive octadecanol the ester of (3,5- di-tert-butyl-hydroxy phenyl) propionic acid, 0.1 part of three (2,4- DI-tert-butylphenol compounds) phosphorous acid
Ester, 0.2 part poly- [1- (2 '-ethoxy) -2,2,6,6- tetramethyl -4- hydroxy piperidine succinates are added in high-speed mixer
Mix at a high speed, the speed of high-speed mixer is 600rmp, and mixing temperature is 50 DEG C, incorporation time 5min；
(3) 5.0 parts of kematals, 0.7 part of polypropylene, 0.3 part of maleic anhydride inoculated polypropylene copolymer are added to
High-speed mixer high speed mixes, and the speed of high-speed mixer is 1000rmp, and mixing temperature is 40 DEG C, and incorporation time is
3min；
(4) mixed material that step (2) obtains is added in step (1) and be kneaded so that is kneaded all in chamber
Material is well mixed, 120 DEG C, speed of agitator 40r/min, mixing time 10min of melting temperature；
(5) mixed material that step (3) obtains is added in step (4) and be kneaded so that is kneaded all in chamber
Material is well mixed, 180 DEG C, speed of agitator 30r/min, mixing time 20min of melting temperature；
(6) material that step (5) obtains is continued to be kneaded 50min so that be kneaded all materials in chamber and be mixed thoroughly
And after not cohesive cavity wall, mixing terminates, and carries out extrusion pelletizing, the injection moulding for obtaining length as 2.5mm, a diameter of 3mm is used not
Become rusty steel feed pellet；Banburying-granulation all-in-one extrusion die temperature is 180 DEG C, and extrusion screw rod temperature is 200 DEG C, screw speed
For 20HZ, pelletizing speed is 45HZ.
Embodiment 3
(1) side is stirred in the mixing chamber that 92 parts of 316L aerosolizations powder (D90 18um) are added in banburying-granulation all-in-one
Side preheating is mixed, preheating temperature is 130 DEG C, speed of agitator 20r/min, preheating time 10min；
(2) by 0.1 part of polyester wax, 0.1 part of ethylene bis stearamide, 0.15 part of EPT rubber elastomer,
0.025 part of triethylene-glycol double [β-(the 3- tert-butyl group -5- methyl -4- hydroxy phenyls) propionic ester], 0.025 part double (3,5- bis-
Tert-butyl-phenyl) pentaerythritol diphosphites, 0.05 part it is poly- [6- [(1,1,3,3- tetramethyl butyl)-amido] 1,3,
5,-triazine -2,4- diyl] [(2,2,6,6- tetramethyl-piperidyl)-imido grpup] -1,6- hexanes diyl-[(2,2,6,6- tetramethyls
Phenylpiperidines base)-imido grpup] mixing of high-speed mixer high speed is added to, the speed of high-speed mixer is 1000rmp, mixing temperature
Spend for 60 DEG C, incorporation time 4min；
(3) by 7.35 parts of kematals, 0.1 part of high density polyethylene (HDPE), 0.1 part of maleic anhydride grafted polyethylene copolymer
The mixing of high-speed mixer high speed is added to, the speed of high-speed mixer is 800rmp, and mixing temperature is 60 DEG C, and incorporation time is
5min；
(4) mixed material that step (2) obtains is added in step (1) and be kneaded so that is kneaded all in chamber
Material is well mixed, 130 DEG C, speed of agitator 35r/min, mixing time 20min of melting temperature；
(5) mixed material that step (3) obtains is added in step (4) and be kneaded so that is kneaded all in chamber
Material is well mixed, 150 DEG C, speed of agitator 35r/min, mixing time 15min of melting temperature；
(6) material that step (5) obtains is continued to be kneaded 45min so that be kneaded all materials in chamber and be mixed thoroughly
And after not cohesive cavity wall, mixing terminates, and carries out extrusion pelletizing, the injection moulding for obtaining length as 2mm, a diameter of 2.5mm is used not
Become rusty steel feed pellet；Banburying-granulation all-in-one extrusion die temperature is 170 DEG C, and extrusion screw rod temperature is 180 DEG C, screw speed
For 25HZ, pelletizing speed is 40HZ.
Embodiment 4
(1) mixing being added to 91.5 parts of 304L steam combined atomizings powder (D90 22um) in banburying-granulation all-in-one
Preheated while stirring in chamber, preheating temperature is 100 DEG C, speed of agitator 20r/min, preheating time 10min；
(2) by 0.4 part of polyoxyethylene wax, 0.2 part of zinc stearate, 0.2 part of SBS elastomer,
0.1 part of four [β-(3,5- di-tert-butyl-hydroxy phenyl) propionic ester] pentaerythritol ester, the double lauryl alcohols of 0.1 part of thio-2 acid
Ester, 0.1 part poly- [1- (2 '-ethoxy) -2,2,6,6- tetramethyl -4- hydroxy piperidine succinates are added in high-speed mixer
Mix at a high speed, the speed of high-speed mixer is 800rmp, and mixing temperature is 40 DEG C, incorporation time 5min；
(3) 6.5 parts of kematals, 0.5 part of polypropylene, 0.4 part of maleic anhydride grafted ethene-octene copolymer are added
Mixed to high-speed mixer high speed, the speed of high-speed mixer is 600rmp, and mixing temperature is 50 DEG C, and incorporation time is
4min；
(4) mixed material that step (2) obtains is added in step (1) and be kneaded so that is kneaded all in chamber
Material is well mixed, 120 DEG C, speed of agitator 40r/min, mixing time 15min of melting temperature；
(5) mixed material that step (3) obtains is added in step (4) and be kneaded so that is kneaded all in chamber
Material is well mixed, 165 DEG C, speed of agitator 40r/min, mixing time 20min of melting temperature；
(6) material that step (5) obtains is continued to be kneaded 50min so that be kneaded all materials in chamber and be mixed thoroughly
And not bond cavity wall after, mixing terminates, and carries out extrusion pelletizing, obtain length for 2mm, a diameter of 2mm injection moulding with stainless
Steel feed pellet；Banburying-granulation all-in-one extrusion die temperature is 160 DEG C, and extrusion screw rod temperature is 190 DEG C, and screw speed is
20HZ, pelletizing speed are 50HZ.
It will be injection moulded under the gained feeding certain condition of 1~embodiment of embodiment 4, then break moulded blank and regrinding-material
It is broken to arrive 3-5mm particles, then broken particulate material is injection moulded, the Vn that so moves in circles (n=0~20) is secondary, through melting
Index Instrument tests MFI values under ISO1133 (190 DEG C, 21.6kg), and its MFI value and Vn relation are as shown in Figure 1.
By taking embodiment 1 as an example, the bending strength of green part obtained by 20 injection mouldings of its circulation and stress is tested, obtains green compact
Intensity with circulation and stress number Vn (n=0~20) variation relation Fig. 2, and by green compact under certain condition through catalysis degreasing and
Vacuum-sintering, gained sintered products, sintered density is tested through Density Measuring Instrument, obtains sintered density and circulation and stress number Vn (n=0
~20) variation relation Fig. 3.
Therefore the stainless steel feeding of the present invention has good mobile performance and excellent stability, in injection molding process
In be recycled recovery use 20 times, its green strength is held essentially constant with the change of circulation and stress number, product after sintering
Sintered density is also held essentially constant with the change of circulation and stress number, can meet its actual operation requirements.
The above-mentioned description to embodiment is understood that for ease of those skilled in the art and using this hair
It is bright.Person skilled in the art obviously easily can make various modifications to these embodiments, and described herein
General Principle is applied in other embodiment without by performing creative labour.Therefore, the invention is not restricted to implementation here
Example, for those skilled in the art according to the announcement of the present invention, not departing from improvement that scope made and modification all should be
Within protection scope of the present invention.
It is emphasized that：It the above is only presently preferred embodiments of the present invention, not the present invention made any formal
Limitation, every any simple modification, equivalent change and modification for being made to above example of technical spirit according to the present invention,
In the range of still falling within technical solution of the present invention.
Claims (10)
1. a kind of stable type injection moulding stainless steel feeding, it is characterised in that be made up of following material according to parts by weight：It is stainless
Powdered steel, 88-93 parts；Kematal, 5-9 parts；Hardening agent, 0.1-1 parts；Compatilizer, 0.1-0.6 parts；Lubricant, 0.1-
0.4 part；Dispersant, 0.1-0.3 parts；Toughener, 0.1-0.2 parts；Stabilizer, 0.1-0.5 parts.
2. stable type injection moulding stainless steel feeding according to claim 1, it is characterised in that：The powder of stainless steel
One or more selected from steam combined atomizing powder or aerosolization powder；The powder of stainless steel be selected from 304L stainless steel powders,
One kind in 316L stainless steel powders, 17-4PH stainless steel powders, nickelles stainless steel powder；The particle diameter of the powder of stainless steel be 18 μm-
26μm。
3. stable type injection moulding stainless steel feeding according to claim 1, it is characterised in that：The hardening agent is by gathering
One or both of ethene, polypropylene form.
4. stable type injection moulding stainless steel feeding according to claim 1, it is characterised in that：The compatilizer is by second
Alkene-vinyl acetate co-polymer, maleic anhydride grafted polyethylene copolymer, maleic anhydride inoculated polypropylene copolymer, maleic acid
One or more compositions in acid anhydride grafted ethene-octene copolymer.
5. stable type injection moulding stainless steel feeding according to claim 1, it is characterised in that：The lubricant is by stone
Wax, Tissuemat E, polyoxyethylene wax, polypropylene wax, polyester wax, one or more compositions of microwax.
6. stable type injection moulding stainless steel feeding according to claim 1, it is characterised in that：The dispersant is hard
Any of resin acid class dispersant or amide-type dispersant；The stearic acid dispersant is stearic acid, calcium stearate, tristearin
One or several kinds of mixtures in sour zinc or pentaerythrite stearate；The amide-type dispersant is erucyl amide, oil
Sour acid amides or ethylene bis stearamide one or more mixture.
7. stable type injection moulding stainless steel feeding according to claim 1, it is characterised in that：The toughener is by second
Alkene-octene elastomer, TPUE, SBS elastomer, ethylene propylene diene rubber/benzene second
One or more mixtures of alkene elastomer, EPT rubber elastomer.
8. stable type injection moulding stainless steel feeding according to claim 1, it is characterised in that：The stabilizer is by resisting
Oxygen agent mixes with hindered amine light stabilizer by weight 1: 1；
The antioxidant is by primary antioxidant and synergistic antioxidant by weight 1: 1 mixing；
The primary antioxidant is four [β-(3,5- di-tert-butyl-hydroxy phenyl) propionic ester] pentaerythritol esters, β-(3,5- bis- uncles
Butyl -4- hydroxy phenyls) the positive octadecanol ester of propionic acid, the double [β-(the 3- tert-butyl group -5- methyl -4- hydroxy benzenes of triethylene-glycol
Base) propionic ester] in one or more；
The synergistic antioxidant be three (2,4-DTBP) phosphite esters, the double lauryl alcohol ester of thio-2 acid or it is double (3,
5- di-tert-butyl-phenyls) it is more than one or more in pentaerythritol diphosphites；
The hindered amine light stabilizer be double 2,2,6, the 6- tetramethyl piperidine alcohol esters of decanedioic acid, it is poly- [1- (2 '-ethoxy) -2,
2,6,6- tetramethyl -4- hydroxy piperidines succinates or it is poly- [6- [(1,1,3,3- tetramethyl butyl)-amido] 1,3,5,-three
Piperazine -2,4- diyl] [(2,2,6,6- tetramethyl-piperidyl)-imido grpup] -1,6- hexanes diyl-[(2,2,6,6- tetramethyl piperidines
Base)-imido grpup] one or more.
9. a kind of manufacture method of stable type injection moulding stainless steel feeding, it is characterised in that comprise the following steps：
(1) preheated while stirring in the mixing chamber that 88-93 part powder of stainless steel is added in banburying-granulation all-in-one；
(2) 0.1-0.4 parts lubricant, 0.1-0.3 parts dispersant, 0.1-0.2 parts toughener, 0.1-0.5 parts stabilizer are added
Mixed to high-speed mixer high speed；
(3) 5-9 parts kematal, 0.1-1 part hardening agents, 0.1-0.6 part compatilizers are added to high-speed mixer high speed
Mix；
(4) mixed material obtained in step (2) and step (3) is added in step (1) and be kneaded so that is kneaded in chamber
All materials are well mixed；
(5) by the material that step (4) obtains continue be kneaded 40-50min so that be kneaded chamber in all materials be mixed thoroughly and
After not bonding cavity wall, mixing terminates, and carries out extrusion pelletizing, and the injection moulding for obtaining length as 2-3mm, a diameter of 2-3mm is used not
Become rusty steel feed pellet.
10. the manufacture method of stable type injection moulding stainless steel feeding according to claim 9, it is characterised in that：
Preheating temperature in the step (1) is 100-130 DEG C, speed of agitator 10-20r/min, preheating time 5-
10min；
The speed of step (2) high-speed mixer is 600-1000rmp, and mixing temperature is 40-60 DEG C, incorporation time 3-
5min；
The speed of step (3) high-speed mixer is 600-1000rmp, and mixing temperature is 40-60 DEG C, incorporation time 3-
5min；
110-130 DEG C of melting temperature in the step (4), speed of agitator 30-40r/min, mixing time 10-20min；
150-180 DEG C of melting temperature in the step (5), speed of agitator 30-40r/min, mixing time 10-20min；
Banburying-granulation all-in-one extrusion die temperature is 160-180 DEG C in the step (5), and extrusion screw rod temperature is 170-200
DEG C, screw speed 15-25HZ, pelletizing speed is 40-50HZ.
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| CN110216278A (en) * | 2019-06-25 | 2019-09-10 | 明阳科技（苏州）股份有限公司 | A kind of high fluidity, lower shrinkage are than feeding and preparation method thereof |
| CN110385428A (en) * | 2019-08-05 | 2019-10-29 | 杭州铭赫科技有限公司 | A kind of high fluidity powdered metallurgical material and preparation method thereof |
| CN110625120A (en) * | 2019-09-21 | 2019-12-31 | 昆山纳诺新材料科技有限公司 | HK30 feed for injection molding and preparation method thereof |
| CN113500192A (en) * | 2021-05-25 | 2021-10-15 | 宁波市鑫瑞鸿新材料科技有限公司 | High-fluidity high-strength metal powder injection molding feed and application method thereof |
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| CN113695575A (en) * | 2021-07-15 | 2021-11-26 | 武晓峰 | Injection molding method of locknut |
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