CN112341751A - High-polishing plastic-based binder for MIM metal injection molding and feeding method thereof - Google Patents
High-polishing plastic-based binder for MIM metal injection molding and feeding method thereof Download PDFInfo
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- CN112341751A CN112341751A CN202010955461.XA CN202010955461A CN112341751A CN 112341751 A CN112341751 A CN 112341751A CN 202010955461 A CN202010955461 A CN 202010955461A CN 112341751 A CN112341751 A CN 112341751A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L59/00—Compositions of polyacetals; Compositions of derivatives of polyacetals
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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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/062—HDPE
Abstract
The invention discloses a high-polishing plastic-based binder for MIM metal injection molding, which is prepared from the following raw materials in percentage by weight: 75-90% of polyformaldehyde POM, 2-10% of high-density polyethylene HDPE, 2-10% of polystyrene PS, 1-5% of paraffin PW, 0.5-5% of stearic acid SA, 1.0-5.0% of ethylene-vinyl acetate EVA, 0.5-2.0% of ethylene bis stearamide EBS and 0.1-2.0% of antioxidant AO. The preparation method of the feed comprises the steps of preheating and mixing the metal powder; adding the binder, banburying, extruding and granulating to obtain granular feed. The binder prepared by the method has low feeding viscosity, good fluidity, good green body shape retention, low residual oxygen content of a sintered part and high density of the sintered part; the method can be widely applied to the metal powder injection molding industry, and is particularly suitable for producing parts with high polishing, large length-diameter ratio, thin wall thickness and complex size.
Description
Technical Field
The invention relates to the technical field of high-polishing plastic-based binders, in particular to a high-polishing plastic-based binder for MIM metal injection molding, and particularly relates to a high-polishing plastic-based binder for MIM metal injection molding and a feeding method thereof.
Background
The powder injection molding is to use high molecular organic matter as a binder, fully utilize the melting and rheological properties of the high molecular organic matter when the high molecular organic matter is heated to a certain temperature, form a mixture of powder and the binder into various molded blanks with required shapes like injection plastic, remove the binder in the molded blanks by a chemical or thermal decomposition method, and finally obtain a final product through sintering densification and necessary subsequent processing procedures. The technology has unique advantages in the aspect of preparing high-precision products with complex shapes, uniform tissue structures and high performance, and is widely applied to the fields of communication equipment, medical instruments, automobiles, electric hardware, military industry and the like.
Binders are the core of powder injection molding technology, where they have the two most fundamental roles of enhancing flow to accommodate injection molding and maintaining the shape of the compact. The quality of the binder directly determines the final performance of the product, and therefore, the selection and optimization of the binder become a key link of powder injection molding.
However, in the process of implementing the technical solution in the prior art, the applicant finds that the following technical problems exist in the technical solution in the prior art:
at present, the adhesive formula of a plastic-based system commonly used in China is most commonly a polyformaldehyde-polymer system, a main filling agent is POM, main bone drying agents are POM, HDPE, PP and EVA, and auxiliary agents are SA and PW. The formula of the binder system is commonly used for metal injection molding with common sintering density and polishing requirements, but in metal products for parts with high polishing, large length-diameter ratio, thin wall thickness and complex size, the problems of low sintering density, poor polishing performance, part surface oxidation and the like exist, and the mass production of powder injection molded products is directly restricted.
Disclosure of Invention
On the one hand, the invention aims to solve the technical problems of low sintering density, poor polishing performance and part surface oxidation of the binder in the prior art and realize the technical effects of high sintering density, good polishing performance and reduction of part surface oxidation.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the high-polishing plastic-based binder for MIM metal injection molding is prepared from the following raw materials in percentage by weight:
75-90% of polyformaldehyde POM, 2-10% of high-density polyethylene HDPE, 2-10% of polystyrene PS, 1-5% of paraffin PW, 0.5-5% of stearic acid SA, 1.0-5.0% of ethylene-vinyl acetate EVA, 0.5-2.0% of ethylene bis stearamide EBS and 0.1-2.0% of antioxidant AO.
Preferably, the binder is prepared from the following raw materials in parts by weight: 85% of polyformaldehyde POM, 3.0% of high-density polyethylene HDPE, 6.0% of polystyrene PS, 2.0% of paraffin PW, 1.0% of stearic acid SA, 2.0% of ethylene-vinyl acetate EVA, 0.5% of ethylene bis stearamide EBS and 0.5% of antioxidant AO.
Preferably, the polyformaldehyde POM is 81 percent, the high-density polyethylene HDPE is 4.0 percent, the polystyrene PS is 6.0 percent, the paraffin PW is 3.0 percent, the stearic acid SA is 2.0 percent, the ethylene-vinyl acetate EVA is 2.0 percent, the ethylene bis stearamide EBS is 1.0 percent and the antioxidant AO is 1.0 percent.
More preferably, the polyformaldehyde POM is 89%, the high-density polyethylene HDPE is 2.0%, the polystyrene PS is 4.0%, the paraffin PW is 2.0%, the stearic acid SA is 0.5%, the ethylene-vinyl acetate EVA is 1.5%, the ethylene bis stearamide EBS is 0.8% and the antioxidant AO is 0.2%.
Particularly preferably, the polyformaldehyde POM is 80%, the high-density polyethylene HDPE is 5.0%, the polystyrene PS is 5.0%, the paraffin PW is 2.5%, the stearic acid SA is 1.5%, the ethylene-vinyl acetate EVA is 3.0%, the ethylene bis stearamide EBS is 2.0% and the antioxidant AO is 1.0%.
Preferably, the antioxidant is a mixture of antioxidant 1010 and antioxidant 245.
The problem to be solved by the other aspect of the invention is to provide a method for feeding a high-polishing plastic-based binder, which comprises the following steps: preheating metal alloy powder to 175-195 ℃, and stirring at the rotating speed of 15-25 r/min; adding the high-polishing plastic-based binder, and banburying at the temperature of 175-195 ℃ for 45-120min, stirring at the rotating speed of 30-40 r/min; and after banburying is finished, extruding and granulating to obtain granular feed.
One or more technical solutions provided by the present application have at least the following technical effects or advantages:
the technical scheme is characterized by comprising the following raw materials in percentage by weight: 75-90% of copolyformaldehyde POM, 2-10% of high-density polyethylene HDPE, 2-10% of polystyrene PS, 1-5% of paraffin PW, 0.5-5% of stearic acid SA, 1.0-5.0% of ethylene-vinyl acetate EVA, 0.5-2.0% of ethylene bis stearamide EBS, 0.1-2.0% of antioxidant AO and the like, so that the copolyformaldehyde provides fluidity and serves as a framework material; high density polyethylene, polystyrene and ethylene-vinyl acetate are used for providing strength support for the degreased feed; the paraffin and the stearic acid are used for lubricating and improving the compatibility of each phase; ethylene bis stearamide is a plasticizer, has good processability and softening performance, can obviously reduce the viscosity of the adhesive and improve the comprehensive performance of the adhesive; stearic acid is used as a surfactant, so that the compatibility of powder and a binder can be improved, and the phenomenon of 'powder-gel separation' in the powder injection molding process is reduced; the antioxidant enables the binder to have good processing stability in the processing process, and avoids the decomposition of components such as polyformaldehyde and the like. The technical problems of low sintering density, poor polishing performance and part surface oxidation of the binder in the prior art are effectively solved, and the technical effects of high sintering density, good polishing performance and reduction of part surface oxidation are further realized.
Drawings
FIG. 1 is a graph of the MFI values of the feed melt flow rates of the present invention.
In the figure, the X-axis represents time (minutes) and the Y-axis represents weight (g).
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The technical scheme of the embodiment of the application solves the problems of low sintering density, poor polishing performance and part surface oxidation of the binder in the prior art by providing the high-polishing plastic-based binder for MIM metal injection molding, and comprises the following raw materials in percentage by weight: 75-90% of polyformaldehyde POM, 2-10% of high-density polyethylene HDPE, 2-10% of polystyrene PS, 1-5% of paraffin PW, 0.5-5% of stearic acid SA, 1.0-5.0% of ethylene-vinyl acetate EVA, 0.5-2.0% of ethylene bis stearamide EBS and 0.1-2.0% of antioxidant AO, and the beneficial effects of high sintering density, good polishing performance and reduction of part surface oxidation are realized.
The general idea of the embodiment of the invention for solving the technical problems is as follows:
the material is composed of the following raw materials by weight percent: 75-90% of copolyformaldehyde POM, 2-10% of high-density polyethylene HDPE, 2-10% of polystyrene PS, 1-5% of paraffin PW, 0.5-5% of stearic acid SA, 1.0-5.0% of ethylene-vinyl acetate EVA, 0.5-2.0% of ethylene bis stearamide EBS, 0.1-2.0% of antioxidant AO and the like, so that the copolyformaldehyde provides fluidity and serves as a framework material; high density polyethylene, polystyrene and ethylene-vinyl acetate are used for providing strength support for the degreased feed; the paraffin and the stearic acid are used for lubricating and improving the compatibility of each phase; ethylene bis stearamide is a plasticizer, has good processability and softening performance, can obviously reduce the viscosity of the adhesive and improve the comprehensive performance of the adhesive; stearic acid is used as a surfactant, so that the compatibility of powder and a binder can be improved, and the phenomenon of 'powder-gel separation' in the powder injection molding process is reduced; the antioxidant enables the binder to have good processing stability in the processing process, and avoids the decomposition of components such as polyformaldehyde and the like.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Example 1
The high-polishing plastic-based binder is used for MIM metal injection molding and comprises the following raw materials in parts by weight: 85% of Polyformaldehyde (POM), 3.0% of high-density polyethylene (HDPE), 6.0% of Polystyrene (PS), 2.0% of Paraffin (PW), 1.0% of Stearic Acid (SA), 2.0% of ethylene-vinyl acetate (EVA), 0.5% of Ethylene Bis Stearamide (EBS) and 0.5% of Antioxidant (AO). The preparation method comprises the following steps: all the raw materials are put into a high-speed mixer to be mixed for 45min at a high speed of 160 ℃, and then the materials are discharged; and putting the mixed raw materials into a granulator to extrude and granulate to obtain the granular binder.
The method for preparing the feed material by using the high-polishing plastic-based binder comprises the following steps:
the particle size is D50: preheating 316L stainless steel metal powder of 6.0-9.0 mu 0 to 185 ℃, and stirring at the rotating speed of 20 r/min; adding the binder according to the volume ratio of 40:60 of the binder to the metal powder, banburying at 190 ℃ for 60min, and stirring at the rotating speed of 40 r/min; after banburying is finished, extruding and granulating in a double-screw extruder to obtain granular feed, wherein the binder is the high-polishing plastic-based binder in the embodiment;
the MFI value for the feed melt flow rate of this example was determined, test standard: ISO 1133; and (3) testing conditions are as follows: temperature: 190 ℃, nominal load: 21.6 Kg; the measurement results are as follows: 1500-1700 g/10 min.
Example 2
The high-polishing plastic-based binder is used for MIM metal injection molding and comprises the following raw materials in parts by weight: polyformaldehyde (POM) 81%, High Density Polyethylene (HDPE) 4.0%, Polystyrene (PS) 6.0%, Paraffin (PW) 3.0%, Stearic Acid (SA) 2.0%, ethylene-vinyl acetate (EVA) 2.0%, Ethylene Bis Stearamide (EBS) 1.0%, and Antioxidant (AO) 1.0%. The preparation method comprises the following steps: all the raw materials are put into a high-speed mixer to be mixed for 45min at a high speed of 160 ℃, and then the materials are discharged; and putting the mixed raw materials into a granulator to extrude and granulate to obtain the granular binder.
The method for preparing the feed material by using the high-polishing plastic-based binder comprises the following steps:
the particle size is D50: preheating 316L stainless steel metal powder of 6.0-9.0 mu to 185 ℃, and stirring at the rotating speed of 20 r/min; adding the binder according to the volume ratio of 40:60 of the binder to the metal powder, banburying at 190 ℃ for 60min, and stirring at the rotating speed of 40 r/min; after banburying is finished, extruding and granulating in a double-screw extruder to obtain granular feed, wherein the binder is the high-polishing plastic-based binder in the embodiment;
the MFI value for the feed melt flow rate of this example was determined, test standard: ISO 1133; and (3) testing conditions are as follows: temperature: 190 ℃, nominal load: 21.6 Kg; the measurement results are as follows: 1300-1600 g/10 min.
Example 3
The high-polishing plastic-based binder is used for MIM metal injection molding and comprises the following raw materials in parts by weight: 85% of Polyformaldehyde (POM), 3.0% of high-density polyethylene (HDPE), 6.0% of Polystyrene (PS), 2.0% of Paraffin (PW), 1.0% of Stearic Acid (SA), 2.0% of ethylene-vinyl acetate (EVA), 0.5% of Ethylene Bis Stearamide (EBS) and 0.5% of Antioxidant (AO). The preparation method comprises the following steps: all the raw materials are put into a high-speed mixer to be mixed for 45min at a high speed of 160 ℃, and then the materials are discharged; and putting the mixed raw materials into a granulator to extrude and granulate to obtain the granular binder.
The method for preparing the feed material by using the high-polishing plastic-based binder comprises the following steps:
the particle size is D50: preheating 17-4PH stainless steel metal powder of 6.0-9.0 mu to 185 ℃, and stirring at the rotating speed of 20 r/min; adding the binder according to the volume ratio of the binder to the metal powder of 41.5:59.5, banburying at 190 ℃ for 60min, and stirring at the rotating speed of 40 r/min; after banburying is finished, extruding and granulating in a double-screw extruder to obtain granular feed, wherein the binder is the high-polishing plastic-based binder in the embodiment;
the MFI value for the feed melt flow rate of this example was determined, test standard: ISO 1133; and (3) testing conditions are as follows: temperature: 190 ℃, nominal load: 21.6 Kg; the measurement results are as follows: 1400-1800 g/10 min.
Example 4
The high-polishing plastic-based binder is used for MIM metal injection molding and comprises the following raw materials in parts by weight: polyformaldehyde (POM) 81%, High Density Polyethylene (HDPE) 4.0%, Polystyrene (PS) 6.0%, Paraffin (PW) 3.0%, Stearic Acid (SA) 2.0%, ethylene-vinyl acetate (EVA) 2.0%, Ethylene Bis Stearamide (EBS) 1.0%, and Antioxidant (AO) 1.0%. The preparation method comprises the following steps: all the raw materials are put into a high-speed mixer to be mixed for 45min at a high speed of 160 ℃, and then the materials are discharged; and putting the mixed raw materials into a granulator to extrude and granulate to obtain the granular binder.
The method for preparing the feed material by using the high-polishing plastic-based binder comprises the following steps:
the particle size is D50: preheating 17-4PH stainless steel metal powder of 6.0-9.0 mu to 185 ℃, and stirring at the rotating speed of 20 r/min; adding the binder according to the volume ratio of the binder to the metal powder of 41.5:59.5, banburying at 190 ℃ for 60min, and stirring at the rotating speed of 40 r/min; after banburying is finished, extruding and granulating in a double-screw extruder to obtain granular feed, wherein the binder is the high-polishing plastic-based binder in the embodiment;
the MFI value for the feed melt flow rate of this example was determined, test standard: ISO 1133; and (3) testing conditions are as follows: temperature: 190 ℃, nominal load: 21.6 Kg; the measurement results are as follows: 1300-1500 g/10 min.
Example 5
The high-polishing plastic-based binder is used for MIM metal injection molding and comprises the following raw materials in parts by weight: 85% of Polyformaldehyde (POM), 3.0% of high-density polyethylene (HDPE), 6.0% of Polystyrene (PS), 2.0% of Paraffin (PW), 1.0% of Stearic Acid (SA), 2.0% of ethylene-vinyl acetate (EVA), 0.5% of Ethylene Bis Stearamide (EBS) and 0.5% of Antioxidant (AO). The preparation method comprises the following steps: all the raw materials are put into a high-speed mixer to be mixed for 45min at a high speed of 160 ℃, and then the materials are discharged; and putting the mixed raw materials into a granulator to extrude and granulate to obtain the granular binder.
The method for preparing the feed material by using the high-polishing plastic-based binder comprises the following steps:
the particle size is D50: preheating 304L stainless steel metal powder of 6.0-9.0 mu to 185 ℃, and stirring at the rotating speed of 20 r/min; adding the binder according to the volume ratio of 40:60 of the binder to the metal powder, banburying at 190 ℃ for 60min, and stirring at the rotating speed of 40 r/min; after banburying is finished, extruding and granulating in a double-screw extruder to obtain granular feed, wherein the binder is the high-polishing plastic-based binder in the embodiment;
the MFI value for the feed melt flow rate of this example was determined, test standard: ISO 1133; and (3) testing conditions are as follows: temperature: 190 ℃, nominal load: 21.6 Kg; the measurement results are as follows: 1400-2000 g/10 min.
Example 6
The high-polishing plastic-based binder is used for MIM metal injection molding and comprises the following raw materials in parts by weight: polyformaldehyde (POM) 81%, High Density Polyethylene (HDPE) 4.0%, Polystyrene (PS) 6.0%, Paraffin (PW) 3.0%, Stearic Acid (SA) 2.0%, ethylene-vinyl acetate (EVA) 2.0%, Ethylene Bis Stearamide (EBS) 1.0%, and Antioxidant (AO) 1.0%. The preparation method comprises the following steps: all the raw materials are put into a high-speed mixer to be mixed for 45min at a high speed of 160 ℃, and then the materials are discharged; and putting the mixed raw materials into a granulator to extrude and granulate to obtain the granular binder.
The method for preparing the feed material by using the high-polishing plastic-based binder comprises the following steps:
the particle size is D50: preheating 304L stainless steel metal powder of 6.0-9.0 mu to 185 ℃, and stirring at the rotating speed of 20 r/min; adding the binder according to the volume ratio of 40:60 of the binder to the metal powder, banburying at 190 ℃ for 60min, and stirring at the rotating speed of 40 r/min; after banburying is finished, extruding and granulating in a double-screw extruder to obtain granular feed, wherein the binder is the high-polishing plastic-based binder in the embodiment;
the MFI value for the feed melt flow rate of this example was determined, test standard: ISO 1133; and (3) testing conditions are as follows: temperature: 190 ℃, nominal load: 21.6 Kg; the measurement results are as follows: 1400-2000 g/10 min.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.
Claims (7)
1. A high-polishing plastic-based binder for MIM metal injection molding is characterized in that: the composite material consists of the following raw materials in percentage by weight:
75-90% of polyformaldehyde POM, 2-10% of high-density polyethylene HDPE, 2-10% of polystyrene PS, 1-5% of paraffin PW, 0.5-5% of stearic acid SA, 1.0-5.0% of ethylene-vinyl acetate EVA, 0.5-2.0% of ethylene bis stearamide EBS and 0.1-2.0% of antioxidant AO.
2. The highly polished plastic-based binder for MIM metal injection molding according to claim 1, wherein: the binder is prepared from the following raw materials in parts by weight: 85% of polyformaldehyde POM, 3.0% of high-density polyethylene HDPE, 6.0% of polystyrene PS, 2.0% of paraffin PW, 1.0% of stearic acid SA, 2.0% of ethylene-vinyl acetate EVA, 0.5% of ethylene bis stearamide EBS and 0.5% of antioxidant AO.
3. The highly polished plastic-based binder for MIM metal injection molding according to claim 1, wherein: polyformaldehyde POM 81%, high density polyethylene HDPE 4.0%, polystyrene PS 6.0%, paraffin PW 3.0%, stearic acid SA 2.0%, ethylene-vinyl acetate EVA 2.0%, ethylene bis stearamide EBS 1.0% and antioxidant AO 1.0%.
4. The highly polished plastic-based binder for MIM metal injection molding according to claim 1, wherein: 89% of polyformaldehyde POM, 2.0% of high-density polyethylene HDPE, 4.0% of polystyrene PS, 2.0% of paraffin PW, 0.5% of stearic acid SA, 1.5% of ethylene-vinyl acetate EVA, 0.8% of ethylene bis stearamide EBS and 0.2% of antioxidant AO.
5. The highly polished plastic-based binder for MIM metal injection molding according to claim 1, wherein: 80% of polyformaldehyde POM, 5.0% of high-density polyethylene HDPE, 5.0% of polystyrene PS, 2.5% of paraffin PW, 1.5% of stearic acid SA, 3.0% of ethylene-vinyl acetate EVA, 2.0% of ethylene bis stearamide EBS and 1.0% of antioxidant AO.
6. The highly polished plastic-based binder for MIM metal injection molding according to claim 1, wherein: the antioxidant is a mixture of antioxidant 1010 and antioxidant 245.
7. A method for feeding a highly polished plastic-based adhesive as claimed in any one of claims 1 to 6, comprising: preheating metal alloy powder to 175-195 ℃, and stirring at the rotating speed of 15-25 r/min; adding the high-polishing plastic-based binder, and banburying at the temperature of 175-195 ℃ for 45-120min, stirring at the rotating speed of 30-40 r/min; and after banburying is finished, extruding and granulating to obtain granular feed.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114210979A (en) * | 2021-12-01 | 2022-03-22 | 深圳市泛海统联精密制造股份有限公司 | Customized feed and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114210979A (en) * | 2021-12-01 | 2022-03-22 | 深圳市泛海统联精密制造股份有限公司 | Customized feed and preparation method thereof |
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