CN102219527A - Binder for injection moulding of powder and preparation method thereof - Google Patents
Binder for injection moulding of powder and preparation method thereof Download PDFInfo
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- CN102219527A CN102219527A CN2011100999638A CN201110099963A CN102219527A CN 102219527 A CN102219527 A CN 102219527A CN 2011100999638 A CN2011100999638 A CN 2011100999638A CN 201110099963 A CN201110099963 A CN 201110099963A CN 102219527 A CN102219527 A CN 102219527A
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- binding agent
- lactic acid
- degreasing
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Abstract
The invention discloses a binder for injection moulding of powder and a preparation method thereof, wherein, the raw material of the binder comprises polylactic acid, lactic acid prepolymer, polyethylene and eleaostearic acid, and the preparation method comprises the step of adding the raw material in a banbury according to proper proportion for mixing for 20-30min, at the temperature of 145-160 DEG C and with the mixing speed of 40-60r/min. By utilizing the characteristic of rapid degradation of polylactic acid under alkaling condition, the binder can be removed more than 90% in 7h, the debinding efficiency is 10 times common thermal debinding. The green body is not easy to expand and crack in the process of catalytic debinding, and the quality of the green body is guaranteed in the debinding process.
Description
One, technical field
The present invention relates to a kind of binding agent and preparation method thereof, specifically a kind of powder injection-molded binding agent and preparation method thereof that is used for.
Two, background technology
Powder injection-molded (PIM) is a novel forming technique that grows up nearly decades, it has disposable shaping complicated shape goods, product size precision height, need not mechanical workout or only needs advantages such as trace is processed, preparation cost is low, and plastic complicated shape, such as having cross-drilled hole, inclined hole, male and fomale(M﹠F), screw thread, thin-walled, the pottery that is difficult to machining and metal shaped piece, have a wide range of applications.And degreasing is the committed step of this technology.On the one hand, can defatting technology itself can direct influence obtain zero defect, not have distortion high-quality degreasing base, thereby greatly influence the quality of final sintered article; On the other hand, degreasing is the longest, the operation the most slowly of spended time in the powder injection-molded production, and is very big to production efficiency, energy consumption and product cost influence.
The service condition of defatting technology at present on the powder injection-molded industrial production, generally the technology of Shi Yonging has following three classes:
The first kind is hot degreasing: its principle is by slow intensification, utilizes evaporation, volatilization and the thermolysis of binding agent in temperature-rise period to remove.For guaranteeing that binding agent causes defectives such as crackle and fracture because volume sharply expands in being converted into the process of gas, heat-up rate is wanted strict control, therefore, the process of hot degreasing is very very long, degreasing time reaches tens hours, even reach hour (Materials letters 2009,57 3784-3788) up to a hundred.
Second class is solvent degreasing: its principle is to utilize some component of binding agent to be dissolved in organic solvent, removes soluble constituent in the binding agent at normal temperatures, and then carries out hot degreasing.Compare degreasing time with the first step and shorten greatly, but base substrate is easy to generate swelling in organic solvent, influence the quality (powder metallurgy industry 2009,19,4 32-35) of base sample.
The 3rd class is a catalytic degreasing: the at present commercial catalytic degreasing that uses is that polyoxymethylene with modification is as binding agent.During degreasing, earlier base substrate is heated to certain temperature, feed the sour gas of heat then, under the sour gas katalysis, binding agent decomposes in billet surface earlier, because ecto-entad progressively takes place when decomposing, the swelling cracking of having avoided the binding agent gasification to bring in the skimming processes has guaranteed the quality of base substrate.Because such degreasing characteristic, the catalytic degreasing process can very fast carrying out, and improves degreasing efficient greatly.Though polyoxymethylene catalytic degreasing technology is very advanced, its cost is too high on the one hand; On the other hand, catalytic eliminating can corrode most metal under acidic conditions, limit its can not with widespread use on the more weak metal powder injection molding of acid resistance (Materials Science and Engineering 2001,20,1 136-139).
Three, summary of the invention
The present invention is for fear of above-mentioned existing in prior technology weak point, and a kind of powder injection-molded binding agent and preparation method thereof that is used for is provided, and the hot degreasing time of conventional wax-based binder is long, production efficiency is low to overcome; Solvent degreasing easily produces the swollen defective; And polyoxymethylene binding agent catalytic degreasing cost is high and the restricted defective of application.
Technical solution problem of the present invention adopts following technical scheme:
A kind of characteristics that are used for powder injection-molded binding agent of the present invention are that its raw material constitutes by mass percentage: poly(lactic acid) 15-30%, lactic acid prepolymer 60-80%, polyethylene 4-8%, stearic acid 1-2%.
The characteristics that the present invention is used for the preparation method of powder injection-molded binding agent are to operate according to the following steps: it is mixing that each raw material is put into Banbury mixer by proportional quantity, mixing time 20-30min, melting temperature 145-160 ℃, mixing speed 40-60r/min.
Poly(lactic acid) in the binder component and polyethylene are passive larger molecular organicses; Lactic acid prepolymer is a small organic molecule, plays plasticising and lubricated effect in binding agent; Stearic acid plays the effect of coupling agent, can improve the consistency between organism and the inorganic powder.
Use the method for this binding agent catalytic degreasing:
Feeding preparation: with binding agent and need powder injection-molded powder add high mix mix in the device compound, described compound is placed forcing machine, get base substrate at a temperature 150-170 ℃ extruding pelletization, the quality of binding agent accounts for the 13-17% of mixture quality, and surplus is a powder.
Degreasing: the gained base substrate is placed in the debinding furnace degreasing 6-8h under 100-130 ℃, 200mol/h reducing atmosphere condition, the poly(lactic acid) and the lactic acid prepolymer decreasing ratio of the binding agent main body composition of base substrate reach more than 90%, and remaining binding agent can remove in the presintering stage.
Described reducing atmosphere is NH
3Atmosphere.
Beneficial effect compared with prior art of the present invention is embodied in:
1, the present invention is with poly(lactic acid) and the lactic acid prepolymer main body as binding agent, the characteristic of utilizing poly(lactic acid) to degrade fast under alkaline condition is reaching more than 90% the binding agent decreasing ratio about 7 hours under the alkaline atmospheric condition, compare with tens hours consuming time of the hot degreasing of conventional wax-based binder even up to a hundred hours, improved the efficient of powder injection-molded production process greatly;
2, binding agent of the present invention be difficult for to produce defectives such as swelling cracking in the catalytic degreasing process, easily produces swelling with solvent degreasing and compares and guaranteed the quality of base substrate in the skimming processes;
3, the characteristic of the polylactic acid based binding agent of the present invention catalyzed degradation under alkaline condition again can widespread use on the not strong metal powder injection molding of acid resistance, with compare from external import polyoxymethylene binding agent the scope not only used extensively and cost also reduce greatly.
Four, embodiment
The present invention is further elaborated below in conjunction with specific embodiment.
Raw material:
Poly(lactic acid), trade mark SF-620, Mitsui chemical company; Polyethylene, trade mark 5000S raises sub-petrochemical industry; Stearic acid, the trade mark 1801, Nanling, Shanghai Chemicals company limited; The zirconia ceramics powder, trade mark OZ-3Y, Dongfang Zirconium Industry Science-Technology Co., Ltd., Guangdong; The silicon nitride ceramics powder, M11, German H.C.Starck company; The metallic iron powder, FYQB100-25 atomized iron powder, Laiwu City Feng Yi metallurgical material company limited; Ti (C, N) based ceramic metal powder, with TiC, TiN, Ni and C ceramic powder by mass ratio 54: 10: 20: obtain after 1 mixing and ball milling, wherein TiC, TiN and Ni are available from Hefei Kai Er Nano-technology Development limited liability company, and C (graphite) is available from the wild graphite product in Shen, Qingdao factory; The alumina-ceramic powder, Alpha-alumina, the plump metallurgical material in Gongyi City company limited.
The lactic acid prepolymer of using among the embodiment 1-5 prepares according to a conventional method, molecular weight 4500-5500.
Embodiment 1:
The raw material that is used for powder injection-molded binding agent in the present embodiment constitutes by mass percentage:
Poly(lactic acid) 15%, lactic acid prepolymer 80%, polyethylene 4%, stearic acid 1%.
Be used in the present embodiment that powder injection-molded binding agent prepares by the following method:
It is mixing that each raw material is put into Banbury mixer by proportional quantity, mixing time 20-30min, melting temperature 145-160 ℃, mixing speed 40-60r/min.
Use the method for this binding agent catalytic degreasing:
Feeding preparation: with binding agent and zirconia ceramics powder add high mix mix in the device compound, described compound is placed forcing machine, get base substrate at a temperature 150-170 ℃ extruding pelletization, the quality of binding agent accounts for 17% of mixture quality, and surplus is the zirconia ceramics powder.
Degreasing: the gained base substrate is placed debinding furnace inherent 100-130 ℃, 200mol/h NH
3Degreasing 6-8h under the atmospheric condition, the poly(lactic acid) and the lactic acid prepolymer decreasing ratio of the binding agent main body composition of base substrate reach more than 90%, and remaining binding agent can remove in the presintering stage.
Embodiment 2:
The raw material that is used for powder injection-molded binding agent in the present embodiment constitutes by mass percentage:
Poly(lactic acid) 20%, lactic acid prepolymer 70%, polyethylene 8%, stearic acid 2%.
The preparation method who is used for powder injection-molded binding agent in the present embodiment is with embodiment 1.
Use the method for this binding agent catalytic degreasing:
Feeding preparation: with binding agent and silicon nitride ceramics powder add high mix mix in the device compound, described compound is placed forcing machine, get base substrate at a temperature 150-170 ℃ extruding pelletization, the quality of binding agent accounts for 13% of mixture quality, and surplus is the silicon nitride ceramics powder.
Degreasing: the gained base substrate is placed debinding furnace inherent 100-130 ℃, 200mol/h NH
3Degreasing 6-8h under the atmospheric condition, the poly(lactic acid) and the lactic acid prepolymer decreasing ratio of the binding agent main body composition of base substrate reach more than 90%, and remaining binding agent can remove in the presintering stage.
Embodiment 3:
The raw material that is used for powder injection-molded binding agent in the present embodiment constitutes by mass percentage:
Poly(lactic acid) 30%, lactic acid prepolymer 60%, polyethylene 8%, stearic acid 2%.
The preparation method who is used for powder injection-molded binding agent in the present embodiment is with embodiment 1.
Use the method for this binding agent catalytic degreasing:
Feeding preparation: with binding agent and metallic iron powder add high mix mix in the device compound, described compound is placed forcing machine, get base substrate at a temperature 150-170 ℃ extruding pelletization, the quality of binding agent accounts for 13% of mixture quality, and surplus is the metallic iron powder.
Degreasing: the gained base substrate is placed debinding furnace inherent 100-130 ℃, 200mol/h NH
3Degreasing 6-8h under the atmospheric condition, the poly(lactic acid) and the lactic acid prepolymer decreasing ratio of the binding agent main body composition of base substrate reach more than 90%, and remaining binding agent can remove in the presintering stage.
Embodiment 4:
The raw material that is used for powder injection-molded binding agent in the present embodiment constitutes by mass percentage:
Poly(lactic acid) 15%, lactic acid prepolymer 80%, polyethylene 4%, stearic acid 1%.
The preparation method who is used for powder injection-molded binding agent in the present embodiment is with embodiment 1.
Use the method for this binding agent catalytic degreasing:
Feeding preparation: with binding agent and Ti (C, N) the based ceramic metal powder add high mix mix in the device compound, described compound is placed forcing machine, get base substrate at a temperature 150-170 ℃ extruding pelletization, the quality of binding agent accounts for 15% of mixture quality, surplus is Ti (C, N) a based ceramic metal powder.
Degreasing: the gained base substrate is placed debinding furnace inherent 100-130 ℃, 200mol/h NH
3Degreasing 6-8h under the atmospheric condition, the poly(lactic acid) and the lactic acid prepolymer decreasing ratio of the binding agent main body composition of base substrate reach more than 90%, and remaining binding agent can remove in the presintering stage.
Embodiment 5:
The raw material that is used for powder injection-molded binding agent in the present embodiment constitutes by mass percentage:
Poly(lactic acid) 15%, lactic acid prepolymer 79%, polyethylene 5%, stearic acid 1%.
The preparation method who is used for powder injection-molded binding agent in the present embodiment is with embodiment 1.
Use the method for this binding agent catalytic degreasing: feeding preparation: with binding agent and alumina-ceramic powder add high mix mix in the device compound, described compound is placed forcing machine, get base substrate at a temperature 150-170 ℃ extruding pelletization, the quality of binding agent accounts for 16% of mixture quality, and surplus is the alumina-ceramic powder.
Degreasing: the gained base substrate is placed debinding furnace inherent 100-130 ℃, 200mol/h NH
3Degreasing 6-8h under the atmospheric condition, the poly(lactic acid) and the lactic acid prepolymer decreasing ratio of the binding agent main body composition of base substrate reach more than 90%, and remaining binding agent can remove in the presintering stage.
Claims (2)
1. one kind is used for powder injection-molded binding agent, it is characterized in that its raw material constitutes by mass percentage: poly(lactic acid) 15-30%, lactic acid prepolymer 60-80%, polyethylene 4-8%, stearic acid 1-2%.
2. described preparation method who is used for powder injection-molded binding agent of claim 1, it is characterized in that operating according to the following steps: it is mixing that each raw material is put into Banbury mixer by proportional quantity, mixing time 20-30min, melting temperature 145-160 ℃, mixing speed 40-60r/min.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103113102A (en) * | 2013-03-15 | 2013-05-22 | 湖南正阳精密陶瓷有限公司 | Zirconia ceramic insert core and preparation method thereof |
| CN104057090A (en) * | 2013-03-20 | 2014-09-24 | 江苏天一超细金属粉末有限公司 | Method for removing printing metal, ceramic product metal, ceramic powder and polymer mixed material and polymer from finished product |
| CN105563616A (en) * | 2015-12-15 | 2016-05-11 | 东莞信柏结构陶瓷股份有限公司 | Forming method for zirconia ceramic products |
| CN109626995A (en) * | 2018-11-30 | 2019-04-16 | 歌尔股份有限公司 | A kind of ceramic injection feeding and ceramic member processing method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101147973A (en) * | 2006-09-22 | 2008-03-26 | 精工爱普生株式会社 | Composition for forming green body, brown body and sintered body |
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- 2011-04-20 CN CN2011100999638A patent/CN102219527A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101147973A (en) * | 2006-09-22 | 2008-03-26 | 精工爱普生株式会社 | Composition for forming green body, brown body and sintered body |
Non-Patent Citations (1)
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| 孔俊等: "聚乳酸基注射陶瓷喂料的流变特性", 《塑料制造》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103113102A (en) * | 2013-03-15 | 2013-05-22 | 湖南正阳精密陶瓷有限公司 | Zirconia ceramic insert core and preparation method thereof |
| CN103113102B (en) * | 2013-03-15 | 2014-08-27 | 湖南正阳精密陶瓷有限公司 | Zirconia ceramic insert core and preparation method thereof |
| CN104057090A (en) * | 2013-03-20 | 2014-09-24 | 江苏天一超细金属粉末有限公司 | Method for removing printing metal, ceramic product metal, ceramic powder and polymer mixed material and polymer from finished product |
| CN105563616A (en) * | 2015-12-15 | 2016-05-11 | 东莞信柏结构陶瓷股份有限公司 | Forming method for zirconia ceramic products |
| CN109626995A (en) * | 2018-11-30 | 2019-04-16 | 歌尔股份有限公司 | A kind of ceramic injection feeding and ceramic member processing method |
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Application publication date: 20111019 |