CN102719080A - Powder injection molding, binder special for powder microinjection molding, and preparation method for binder - Google Patents
Powder injection molding, binder special for powder microinjection molding, and preparation method for binder Download PDFInfo
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- CN102719080A CN102719080A CN2012102115710A CN201210211571A CN102719080A CN 102719080 A CN102719080 A CN 102719080A CN 2012102115710 A CN2012102115710 A CN 2012102115710A CN 201210211571 A CN201210211571 A CN 201210211571A CN 102719080 A CN102719080 A CN 102719080A
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Abstract
The invention discloses powder injection molding, binder special for powder microinjection molding, and a preparation method for the binder. The binder comprises the following components in percentage by weight: 10 to 40 percent of polyethylene glycol (PEG), 10 to 40 percent of ethylene vinyl acetate (EVA), 20 to 40 percent of polyvinyl butyral (PVB), and 5 to 20 percent of stearic acid (SA). The preparation method is characterized by comprising the following steps of: completely melting PEG with a low melting point in a thermostat at the appropriate temperature which is lower than the melting point of polymer, adding the weighed EVA and SA and stirring continuously, adding PVB in batches, strongly stirring to obtain uniform milk, and after the milk is cooled, taking out. The binder has the advantages that the binder and feed are excellent in flowability; the PVB and the EVA in the selected binder are used as framework polymer in a water soluble binder system, so that the effect of enhancing the feed is achieved, the shape of a green body can be kept in a degreasing process, and the collapsing and deformation of the green body can be avoided; and the binder is environment-friendly, desolventizing solvent is distilled water, the degreasing velocity is high, and high shape keeping performance is guaranteed.
Description
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Technical field
The invention belongs to the micro-powder injection molding technical field, the preparation method of a kind of micro-powder injection molding with water-soluble binder particularly is provided.
Background technology
Microsystems technology and related prods potential market are huge, have been applied in fields such as information and mechanics of communication, medical treatment and biotechnology, miniature biography optical element technology of preparing.In order to develop the development potentiality of microsystems technology, batch process cost performance height and CONSTRUCTED SPECIFICATION are reduced to micron-sized complicated miniature part and are seemed very important.Therefore the research of microsystems technology deepens continuously, and uses also increasingly extensive.
The traditional Micrometer-Nanometer Processing Technology of the many employings of the preparation method of miniature parts; Like miniature cutting, laser cutting, silicon etching technology, LIGA (photoetching; Electroplate and casting) technology etc. often receives the limitation of work material; Can't satisfy the double requirements of technical feasibility and high performance-price ratio simultaneously, and production efficiency is low, can't be applied to produce in batches.Along with the fast development of microsystems technology, the normal material that uses like silicon single crystal and organic cpds, can't satisfy some property requirements, like high temperature resistant, antioxidant, wear-resistant, corrosion-resistant at present in Micrometer-Nanometer Processing Technology.And stupalith has satisfied these particular requirements well, so metal and ceramic minitype components and parts have the more superior performance of device of material produce such as silicon under severe condition such as high temperature, physical strength height and corrosion.
In order to overcome the deficiency of traditional microfabrication technology, the micro-powder injection molding technology has obtained fast development as the special case of conventional powder injection molding technology.Compare with other manufacturing technologies, but the micro-powder injection molding technology has wide mass production of materials processed scope and advantage cheaply, is a kind of tool little ME with broad prospects for development.
The production of miniature parts is much higher to the more traditional large-scale part of shape, dimension precision requirement of product; And highlight because of the feeding mould filling process difficulty of the little microinjection that causes of die cavity yardstick; Fill wherein that type is imperfect to become distinct issues and typical injection defective, and a little distortion or come off will lead to the failure directly all in the follow-up degreasing process.
Water-soluble binder is meant to have good flowability, viscosity and intensity under the low temperature, has the characteristic of the required sticker of micro injection molding, can satisfy the demand of micro-powder injection molding and degreasing process, and the solvent degreasing solvent is a zero(ppm) water.
Summary of the invention
The objective of the invention is to prepare the special-purpose water-soluble binder of a kind of micro-powder injection molding; It is the required sticker of micro-powder injection molding technology preparation good, the flawless miniature parts of shape; Realized that shape is good, the preparation of the micro-powder injection molding of flawless miniature parts, guaranteed the production process green non-pollution of metal and ceramic minitype parts.
The sticker that the present invention prepared is a heteropolymer constituent element water-soluble binder; With polyoxyethylene glycol (PEG) is water-soluble constituent element; With ethane-acetic acid ethyenyl ester (EVA) and polyvinyl butyral acetal (PVB) is softening agent; With Triple Pressed Stearic Acid (SA) is tensio-active agent, and each constituent element massfraction is (20～40) %PEG+ (20～40) %EVA+ (20～40) %PVB+ (5～10%) SA.Preparation technology of the present invention is: in thermostat; Under 140～160 oC temperature, earlier low-melting PEG component is all melted; Putting into the EVA and the SA that weigh up does not then stop simultaneously to stir; Put into PVB and powerful the stirring at last in batches, treat to take out after its cooling, finally make the good water-soluble binder of consistency until obtaining uniform milk.
Skeleton polymer is selected EVA and the PVB of softening temperature at 60-90 oC for use, satisfying binder mixture, mixing feeding, during the injection green compact to the requirement of temperature; The PEG molecular weight of selecting for use is 1000 and 2000, good fluidity.
Advantage of the present invention is:
1. the constituent element in the dissolubility binder system that adopts belongs to environmentally friendly, and as the solution-off solvent, degreasing speed is fast with zero(ppm) water, and cost is low;
With EVA and PVB jointly as the skeleton polymer in the binder system, satisfy the requirement of strength of green compact easily, help being shaped and the demoulding, obtain perfect sunken miniature parts green compact.
Embodiment
Embodiment 1:
Raw material: each constituent element massfraction of sticker is 20%PEG-1000+25%PEG-2000+20%PVB+ 30%EVA+5%SA.
Under 150 oC constant temperature, earlier low-melting PEG1000 and PEG2000 are melted fully, put into the EVA and the SA that weigh up then and do not stop to stir, add PVB and powerful the stirring at last in batches, treat its cold reaching out until obtaining uniform milk.Finally make the good water-soluble binder of consistency.With this sticker and submicron order Zirconium oxide powder by volume mark be that 52% solid-state tonburden is mixed and made into feeding; On the conventional injection forming mill; In injection temperature 110-170 oC, injection pressure 80-85 MPa injected, in the water of 40-80 oC, part sticker composition carried out degreasing, sintering again in submergence 4-12 hour then; Obtain good, the no significant defect of zirconium white miniature gears part forming property, minimum microstructure size is 30 μ m.
Embodiment 2:
Raw material: each constituent element massfraction of sticker is 20%PEG-1000+20%PEG-2000+20%PVB+ 30%EVA+10%SA.
Under 150 oC constant temperature, earlier low-melting PEG1000 and PEG2000 are melted fully, put into the EVA and the SA that weigh up then and do not stop to stir, add PVB and powerful the stirring at last in batches, treat its cold reaching out until obtaining uniform milk.Finally make the good water-soluble binder of consistency.With this sticker and submicron order Zirconium oxide powder by volume mark be that the solid-state tonburden of 49-51% is mixed and made into feeding; On the conventional injection forming mill; Under injection temperature 120-170oC, injection pressure 80-90 MPa, be shaped, in the water of 40-80 oC, part sticker composition carried out degreasing, sintering again in submergence 4-12 hour then; Obtain good, the no significant defect of zirconium white miniature gears part forming property, minimum microstructure size is 30 μ m.
Embodiment 3:
Raw material: each constituent element massfraction of sticker is 25%PEG-1000+15%PEG-2000+25%PVB+ 20%EVA+15%SA.
Under 150 oC constant temperature, earlier low-melting PEG1000 and PEG2000 are melted fully, put into the EVA and the SA that weigh up then and do not stop to stir, add PVB and powerful the stirring at last in batches, treat its cold reaching out until obtaining uniform milk.Finally make the good water-soluble binder of consistency.With this sticker and submicron order Zirconium oxide powder by volume mark be that the solid-state tonburden of 48-49% is mixed and made into feeding; On the conventional injection forming mill; Under injection temperature 125-175 oC, injection pressure 80-100 MPa, be shaped, in the water of 40-80 oC, part sticker composition carried out degreasing, sintering again in submergence 4-12 hour then; Obtain good, the no significant defect of zirconium white miniature gears part forming property, minimum microstructure size is 30 μ m.
Embodiment 4:
Raw material: each constituent element massfraction of sticker is 15%PEG-1000+15%PEG-2000+35%PVB+ 20%EVA+15%SA.
Under 150 oC constant temperature, earlier low-melting PEG1000 and PEG2000 are melted fully, put into the EVA and the SA that weigh up then and do not stop to stir, add PVB and powerful the stirring at last in batches, treat its cold reaching out until obtaining uniform milk.Finally make the good water-soluble binder of consistency.With this sticker and submicron order Zirconium oxide powder by volume mark be that the solid-state tonburden of 46-49% is mixed and made into feeding; On the conventional injection forming mill; Under injection temperature 130-175 oC, injection pressure 90-110 MPa, be shaped, in the water of 40-80 oC, part sticker composition carried out degreasing, sintering again in submergence 4-9 hour then; Obtain good, the no significant defect of zirconium white miniature gears part forming property, minimum microstructure size is 30 μ m.
Claims (3)
1. a micro-powder injection molding is used water-soluble binder; It is characterized in that: polyoxyethylene glycol PEG is as water-soluble constituent element; Polyvinyl butyral acetal PVB and ethane-acetic acid ethyenyl ester EVA are as softening agent; Triple Pressed Stearic Acid SA is as tensio-active agent, and the mass percent of each constituent element is 20～40%PEG+20～40%EVA+20～40%PVB+5～10%SA.
2. a kind of micro-powder injection molding as claimed in claim 1 is with the preparation method of water-soluble binder; It is characterized in that: its preparation technology is: in thermostat; Under 140～160 ℃ of temperature, earlier low-melting PEG component is all melted, put into the EVA and the SA that weigh up then and do not stop simultaneously to stir, put into PVB and powerful the stirring at last in batches until obtaining uniform milk; Treat its cooling back taking-up, finally make the good water-soluble binder of consistency.
3. according to the preparation method of the described micro-powder injection molding of claim 2 with water-soluble binder; It is characterized in that: it is the EVA of 70 oC and the PVB of 75 oC that polymkeric substance is selected softening temperature for use; Satisfying binder mixture, the preparation feeding, during the injection green compact to the requirement of temperature; Select for use the PEG molecular weight between 1000-2000, good fluidity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012102115710A CN102719080A (en) | 2012-06-26 | 2012-06-26 | Powder injection molding, binder special for powder microinjection molding, and preparation method for binder |
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| CN2012102115710A CN102719080A (en) | 2012-06-26 | 2012-06-26 | Powder injection molding, binder special for powder microinjection molding, and preparation method for binder |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104308155A (en) * | 2014-11-05 | 2015-01-28 | 中国矿业大学(北京) | Method for manufacturing microarray through powder microinjection molding |
| CN106007735A (en) * | 2015-08-25 | 2016-10-12 | 洛阳新巨能高热技术有限公司 | Silicon carbide ceramic injection molded binder |
| CN106349993A (en) * | 2016-08-25 | 2017-01-25 | 苏州赛特锐精密机械配件有限公司 | Adhesive for injection molding of metal powder |
| EP3192628A1 (en) * | 2016-01-15 | 2017-07-19 | CeramTec GmbH | Production of thick-walled components by means of injection moulding |
| CN107716929A (en) * | 2017-08-21 | 2018-02-23 | 柳州科尔特锻造机械有限公司 | The forging method of counterweight peculiar to vessel |
| CN108947545A (en) * | 2018-06-28 | 2018-12-07 | 深圳艾利门特科技有限公司 | A kind of water base degreasing binder for ceramic injection forming |
| CN113828778A (en) * | 2021-09-23 | 2021-12-24 | 东睦新材料集团股份有限公司 | Water-soluble binder, preparation method of binder and method for preparing parts |
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| CN101618568A (en) * | 2009-02-27 | 2010-01-06 | 清华大学 | Preparation method of superfine ceramic powder injection molding mixture |
| CN101885614A (en) * | 2010-07-19 | 2010-11-17 | 北京科技大学 | Precursor water-soluble binder for powder injection molding and preparation method |
| CN102307827A (en) * | 2009-02-09 | 2012-01-04 | 株式会社Ihi | Process for producing sintered sialon ceramic |
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2012
- 2012-06-26 CN CN2012102115710A patent/CN102719080A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102307827A (en) * | 2009-02-09 | 2012-01-04 | 株式会社Ihi | Process for producing sintered sialon ceramic |
| CN101618568A (en) * | 2009-02-27 | 2010-01-06 | 清华大学 | Preparation method of superfine ceramic powder injection molding mixture |
| CN101885614A (en) * | 2010-07-19 | 2010-11-17 | 北京科技大学 | Precursor water-soluble binder for powder injection molding and preparation method |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104308155A (en) * | 2014-11-05 | 2015-01-28 | 中国矿业大学(北京) | Method for manufacturing microarray through powder microinjection molding |
| CN106007735A (en) * | 2015-08-25 | 2016-10-12 | 洛阳新巨能高热技术有限公司 | Silicon carbide ceramic injection molded binder |
| EP3192628A1 (en) * | 2016-01-15 | 2017-07-19 | CeramTec GmbH | Production of thick-walled components by means of injection moulding |
| CN106349993A (en) * | 2016-08-25 | 2017-01-25 | 苏州赛特锐精密机械配件有限公司 | Adhesive for injection molding of metal powder |
| CN107716929A (en) * | 2017-08-21 | 2018-02-23 | 柳州科尔特锻造机械有限公司 | The forging method of counterweight peculiar to vessel |
| CN108947545A (en) * | 2018-06-28 | 2018-12-07 | 深圳艾利门特科技有限公司 | A kind of water base degreasing binder for ceramic injection forming |
| CN113828778A (en) * | 2021-09-23 | 2021-12-24 | 东睦新材料集团股份有限公司 | Water-soluble binder, preparation method of binder and method for preparing parts |
| CN113828778B (en) * | 2021-09-23 | 2023-12-19 | 东睦新材料集团股份有限公司 | Water-soluble binder, preparation method of binder and method for preparing part |
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Application publication date: 20121010 |