CN115464135A - Injection molding feed with modified stainless steel powder and cationic binder - Google Patents
Injection molding feed with modified stainless steel powder and cationic binder Download PDFInfo
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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
- B22F1/102—Metallic powder coated with 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
- 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
- B22F1/107—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material containing organic material comprising solvents, e.g. for slip casting
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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
- B22F1/108—Mixtures obtained by warm mixing
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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 relates to an injection molding feed with modified stainless steel powder and a cationic binder, belonging to the technical field of metal powder injection molding. The preparation operation steps are as follows: (1) Carrying out surface treatment on stainless steel powder by using stearate to obtain modified stainless steel powder; (2) Adding Methyl Methacrylate (MMA) and a functional monomer containing a cationic side chain into an N, N-dimethylformamide solvent with the mass concentration of 55% for solution copolymerization to obtain a polymer containing the cationic side chain; (3) Mixing 92-95 parts by mass of stearate modified stainless steel powder, 3-4.5 parts by mass of cationic polymer and 2.0-3.5 parts by mass of polyethylene glycol in an internal mixer to obtain an injection molding feed; the melt index is 31.5-36.7 g/10min (190 ℃,5 kg). The invention formulaThe components are matched with each other, and the density of the prepared green compact is 5.07-5.17 g/cm on the premise of ensuring good fluidity of injection molding feeding 3 The bending modulus of the green body is 1478-2086 MPa, and the performance of the green body is improved.
Description
Technical Field
The invention belongs to the technical field of metal powder injection molding, and particularly relates to a metal injection molding feed composed of modified stainless steel powder and a cationic polymer-containing binder and a preparation method thereof.
Background
Metal powder injection molding (MIM) technology has been developed in the 80 th 20 th century, and has been widely used in industrial production, and plays an important role in the production of miniature Metal parts with complex geometric shapes and high requirements for part precision, and the Metal parts of the MIM technology have a much lower manufacturing cost than other processing methods, and significantly improve the material utilization rate, and are widely used in the industries of automobiles, medical instruments, electronic appliances, IT, and the like.
Metal injection molding is the most important procedure in the whole process flow, and products are easy to crack, lack of filler, bubble holes and other problems in the process, so that the quality of subsequent products is influenced, and even the whole batch of products can be scrapped. At present, the Metal Injection Molding (MIM) process still has more defects, and most of the defects are caused by the problems of the nature of the binder, for example, the metal powder and the binder are unevenly distributed, so that the compatibility and affinity are poor, and the common problems of phase separation, poor green body performance, poor degreasing and shape retention, poor dimensional stability and the like are caused when the metal powder and the binder are mixed. Therefore, in order to reduce these production problems, the preparation and selection of the binder are started, and therefore the preparation technology of the binder is the most important part in the metal powder injection molding at present, and is also an important point for promoting the advancement and development of the metal powder injection molding technology.
Disclosure of Invention
In order to achieve the purpose of improving the performance of a green body on the premise of ensuring good fluidity of the feed, the invention provides the injection molding feed with modified stainless steel powder and cationic binder.
An injection molding feed with modified stainless steel powder and cationic binder is prepared by mixing 92-95 parts by mass of stearate modified stainless steel powder, 3-4.5 parts by mass of cationic polymer and 2-3.5 parts by mass of polyethylene glycol;
the preparation operation steps are as follows:
(1) Carrying out surface treatment on stainless steel powder by using stearate to obtain modified stainless steel powder;
(2) Adding Methyl Methacrylate (MMA) and a functional monomer containing a cationic side chain into an N, N-dimethylformamide solvent with the mass concentration of 55% for solution copolymerization to obtain a polymer containing the cationic side chain;
(3) Mixing the polymer containing the cationic side chain, polyethylene glycol and modified stainless steel powder together in an internal mixer to obtain an injection molding feed;
under the test conditions of 190 ℃ and 5kg load, the melt index of the injection molding feed is 31.5-36.7 g/10min; the density of the green body made of injection molding feed is 5.07-5.17 g/cm 3 And the bending modulus of the green body is 1478-2086 MPa.
The further technical scheme is as follows:
the functional monomer containing the cationic side chain is one of methacryloyloxyethyl trimethyl ammonium chloride (DMC), acryloxyethyl trimethyl ammonium chloride (DAC) or dimethyl diallyl ammonium chloride (DMDAAC).
In the step (1), 32g of sodium stearate is added into 150mL of acetone solvent and uniformly stirred to obtain a sodium stearate surface modifier; adding 8Kg of stainless steel powder into a high-speed mixer, heating to 140 ℃, uniformly adding sodium stearate surface modifier for three times, wherein the adding amount is 50g each time, and mixing for 30min at the rotating speed of 800rpm to obtain the stearate modified stainless steel powder.
In the step (2), 90 to 95g of Methyl Methacrylate (MMA), 9.5 to 19.5g of functional monomer containing a cationic side chain and 127 to 134g of N, N-dimethylformamide solution (DMF) with the mass concentration of 55% are uniformly mixed and divided into two mixtures; adding the first part of the mixture into a container with a stirrer and a condenser, and introducing nitrogen for 30min to exhaust air; adding 1.054 to 1.094g of initiator azobisisobutyronitrile into the other mixture, slowly dripping the initiator into the first mixture through a constant pressure funnel for 1h, and carrying out oil bath reaction at the constant temperature of 80 ℃ for 10h to obtain a product; dropwise adding the product into 2L of methanol with the purity of 99.5% to obtain a precipitate; washing the precipitate with 500ml deionized water for three times, and then washing the precipitate with 500ml methanol with the purity of 99.5% for three times to obtain a purified product; and drying in a vacuum drying oven at 70 ℃ for 12h to obtain the polymer containing the cationic side chain, wherein the polymer is polymethyl methacrylate-methacryloyloxyethyl trimethyl ammonium chloride.
In the step (3), 240.574 to 241.092g of modified stainless steel powder, 12.112 to 12.520g of polymer containing a cationic side chain and 5.214 to 5.489g of polyethylene glycol are added into an internal mixer, and the mixture is mixed for 15min at the rotating speed of 50rpm and the temperature of 180 ℃ to obtain the injection molding feed containing the modified stainless steel powder and the cationic binder.
The beneficial technical effects of the invention are embodied in the following aspects:
1. the invention relates to an injection molding feed prepared by taking stearate modified stainless steel powder and a binder containing cationic ions as raw materials. Stearate is used as a surfactant, a stearate negative charge layer can be formed on the surface of the metal powder with positive charges through physical blending, the surface energy of the metal powder is reduced, the agglomeration among the powder is effectively improved, and therefore the dispersion uniformity of the stainless steel powder in the binder is improved. On the other hand, in the process of preparing the injection molding feed by using the stearate modified stainless steel powder and the cationic binder, a large number of anionic groups on the surface of the stearate modified stainless steel powder can generate electrostatic interaction with cationic side chains in the cationic binder, so that the interface bonding force between two phases is improved, the compatibility between two injection molding feed components is improved, and the mechanical property of a blank body is improved.
2. The powder loading of the prepared feed is 63-65%, the melt index of the injection molding feed is 31.5-36.7 g/10min under the test conditions that the temperature is 190 ℃ and the load is 5kg, the density of the prepared green compact is 5.07-5.17 g/cm < 3 >, and the flexural modulus of the prepared green compact is 1478-2086 MPa. The components in the formula are matched with each other, so that the purpose of improving the performance of the green body is achieved on the premise of ensuring good fluidity of the feeding material.
Drawings
FIG. 1 is a flow chart of the preparation of an injection molding feed with stearate modified stainless steel powder and a binder containing a cationic polymer.
FIG. 2 is a schematic representation of the interaction of stearate modified stainless steel powder and a cationic-containing polymer.
Detailed Description
The present invention will be further described with reference to the following examples.
The sources of materials used in the following examples are illustrated below:
the raw materials other than the cationic polymer used in the present invention are commercially available, and for example, stainless steel powder used in the present invention is manufactured by Sandvik Osprey of UK, and polyethylene glycol and N, N-dimethylformamide are manufactured by national institute of medicine. The other raw materials are common materials which are known and used, and can be produced by manufacturers and purchased in various ways.
Example 1
Referring to fig. 1, an injection molding feed having a modified stainless steel powder and a cationic binder is prepared by the following steps:
(1) Preparation of stearate-modified stainless Steel powder
32g of sodium stearate and 150mL of acetone are added into a beaker and stirred to be dissolved uniformly, so as to obtain the sodium stearate surface modifier. Adding 8Kg of stainless steel powder into a high-speed mixer, heating to 140 ℃, uniformly adding sodium stearate surface modifier for three times, wherein the adding amount is 50g each time, and mixing for 30min at the rotating speed of 800rpm to obtain the stearate modified stainless steel powder.
(2) Preparation of cationic side chain-containing polymers
95g of Methyl Methacrylate (MMA), 10.4g of methacryloyloxyethyl trimethylammonium chloride (DMC) and 128.82g of a 55% strength by mass N, N-dimethylformamide solution (DMF) are mixed uniformly and divided into two mixtures; adding the first mixture into a three-neck flask with a stirrer and a condenser, and introducing nitrogen for 30min to remove air; adding 1.054g of azodiisobutyronitrile serving as an initiator into the other mixture, slowly dropwise adding the mixture into the first mixture through a constant-pressure funnel for 1h, and carrying out oil bath reaction at the constant temperature of 80 ℃ for 10h to obtain a product; dropwise adding the product into 2L of methanol with the purity of 99.5% to obtain a precipitate; washing the precipitate with 500ml deionized water for three times, and then washing the precipitate with 500ml methanol with the purity of 99.5% for three times to obtain a purified product; and drying for 12 hours in a vacuum drying oven at 70 ℃ to obtain the polymer containing the cationic side chain, wherein the polymer is polymethyl methacrylate-methacryloyloxyethyl trimethyl ammonium chloride.
(3) Preparation of injection Molding feedstock
240.574g modified stainless steel powder, 12.413g polymer containing cationic side chain and 5.411g polyethylene glycol are added into an internal mixer, and are mixed for 15min under the conditions of 50rpm of rotation speed and 180 ℃ of temperature, so that the injection molding feed with the modified stainless steel powder and the cationic binder is obtained.
The melt index of the injection molding feed of the embodiment is 31.5g/10min under the test conditions of 190 ℃ and 5kg load; green density 5.07g/cm with injection molded feedstock 3 And the green flexural modulus is 1478MPa.
Referring to FIG. 2, the stearate has a large number of anionic groups: (
) In the blending of the stearate with the stainless steel powder, the stearate is adsorbed on the surface of the stainless steel powder having a positive charge on the surface (
) So that the outermost layer of the stainless steel powder coated with stearate forms a negatively charged layer (
). During the feeding process, the negative charge layer formed on the surface of the stainless steel powder can generate static electricity with the cationic side chain of the cationic polymer in the binderAnd (4) interaction.
Example 2
The preparation operation steps of the injection molding feed with the modified stainless steel powder and the cationic binder are as follows:
(1) Preparation of stearate-modified stainless Steel powder
32g of sodium stearate and 150mL of acetone are added into a beaker and stirred to be dissolved uniformly, so as to obtain the sodium stearate surface modifier. Adding 8Kg of stainless steel powder into a high-speed mixer, heating to 140 ℃, uniformly adding sodium stearate surface modifier for three times, wherein the adding amount is 50g each time, and mixing for 30min at the rotating speed of 800rpm to obtain the stearate modified stainless steel powder.
(2) Preparation of cationic side chain-containing polymers
Uniformly mixing 95g of Methyl Methacrylate (MMA), 11.738g of dimethyldiallylammonium chloride (DMDAAC) and 130.456g of a 55% N, N-dimethylformamide solution (DMF), and dividing the mixture into two mixtures; adding the first mixture into a three-neck flask with a stirrer and a condenser, and introducing nitrogen for 30min to remove air; adding 1.067g of initiator azobisisobutyronitrile into the other mixture, slowly dripping the initiator into the first mixture through a constant pressure funnel for 1h, and carrying out oil bath reaction at the constant temperature of 80 ℃ for 10h to obtain a product; dropwise adding the product into 2L of methanol with the purity of 99.5% to obtain a precipitate; washing the precipitate with 500ml deionized water for three times, and then washing the precipitate with 500ml methanol with the purity of 99.5% for three times to obtain a purified product; and drying for 12h in a vacuum drying oven at 70 ℃ to obtain the polymer containing the cationic side chain, wherein the polymer is polymethyl methacrylate-dimethyl diallyl ammonium chloride.
(3) Preparing injection molding feedstock
240.574g modified stainless steel powder, 12.520g polymer containing cationic side chain and 5.489g polyethylene glycol are added into an internal mixer, and are mixed for 15min under the conditions of 50rpm of rotation speed and 180 ℃ of temperature, so that the injection molding feed with the modified stainless steel powder and the cationic binder is obtained.
The injection molding feed of this example was loaded at a temperature of 190 ℃ and a load of 5kgUnder the test condition, the melt index is 34.5g/10min; green density of 5.12g/cm with injection molded feed 3 The green flexural modulus was 1578MPa.
Example 3
The preparation operation steps of the injection molding feed with the modified stainless steel powder and the cationic binder are as follows:
(1) Preparation of stearate-modified stainless Steel powder
32g of sodium stearate and 150mL of acetone are added into a beaker and stirred to be dissolved uniformly, so as to obtain the sodium stearate surface modifier. Adding 8Kg of stainless steel powder into a high-speed mixer, heating to 140 ℃, uniformly adding sodium stearate surface modifier for three times, wherein the adding amount is 50g each time, and mixing for 30min at the rotating speed of 800rpm to obtain the stearate modified stainless steel powder.
(2) Preparation of cationic side chain-containing polymers
95g of Methyl Methacrylate (MMA), 9.68g of acryloyloxyethyltrimethyl ammonium chloride (DAC) and 127.95g of a 55% strength by mass N, N-dimethylformamide solution (DMF) were mixed uniformly and divided into two mixtures; adding the first mixture into a three-neck flask with a stirrer and a condenser, and introducing nitrogen for 30min to remove air; adding 1.047g of initiator azobisisobutyronitrile into the other mixture, slowly dripping the initiator into the first mixture through a constant pressure funnel for 1h, and carrying out oil bath reaction at the constant temperature of 80 ℃ for 10h to obtain a product; dropwise adding the product into 2L of methanol with the purity of 99.5% to obtain a precipitate; washing the precipitate with 500ml deionized water for three times, and then washing the precipitate with 500ml methanol with the purity of 99.5% for three times to obtain a purified product; and drying for 12 hours in a vacuum drying oven at 70 ℃ to obtain the polymer containing the cationic side chain, wherein the polymer is polymethyl methacrylate-acryloyloxyethyl trimethyl ammonium chloride.
(3) Preparation of injection Molding feedstock
240.574g modified stainless steel powder, 12.230g polymer containing cationic side chain and 5.367g polyethylene glycol are added into an internal mixer, and are mixed for 15min under the conditions of 50rpm of rotation speed and 180 ℃ of temperature, so that the injection molding feed with the modified stainless steel powder and the cationic binder is obtained.
The melt index of the injection molding feed of this example was 36.7g/10min at a temperature of 190 ℃ under a 5kg load test; green density of 5.16g/cm with injection molded feed 3 And the green flexural modulus was 1799MPa.
Example 4
The preparation operation steps of the injection molding feed with the modified stainless steel powder and the cationic binder are as follows:
(1) Preparation of stearate-modified stainless Steel powder
32g of sodium stearate and 150mL of acetone are added into a beaker and stirred to be dissolved uniformly, so as to obtain the sodium stearate surface modifier. Adding 8Kg of stainless steel powder into a high-speed mixer, heating to 140 ℃, uniformly adding sodium stearate surface modifier for three times, wherein the adding amount is 50g each time, and mixing for 30min at the rotating speed of 800rpm to obtain the stearate modified stainless steel powder.
(2) Preparation of cationic side chain-containing polymers
Uniformly mixing 90g of Methyl Methacrylate (MMA), 19.367g of acryloyloxyethyltrimethyl ammonium chloride (DAC) and 133.67g of N, N-dimethylformamide solution (DMF) with the mass concentration of 55%, and dividing the mixture into two parts; adding the first part of the mixture into a three-neck flask with a stirrer and a condenser, and introducing nitrogen for 30min to discharge air; adding 1.094g of initiator azobisisobutyronitrile into the other mixture, slowly dripping the initiator into the first mixture through a constant pressure funnel for 1h, and carrying out oil bath reaction at the constant temperature of 80 ℃ for 10h to obtain a product; dropwise adding the product into 2L of methanol with the purity of 99.5% to obtain a precipitate; washing the precipitate with 500ml deionized water for three times, and then washing the precipitate with 500ml methanol with the purity of 99.5% for three times to obtain a purified product; and drying for 12 hours in a vacuum drying oven at 70 ℃ to obtain the polymer containing the cationic side chain, wherein the polymer is polymethyl methacrylate-acryloyloxyethyl trimethyl ammonium chloride.
(3) Preparation of injection Molding feedstock
241.092g modified stainless steel powder, 12.112g polymer containing cationic side chain and 5.214g polyethylene glycol are added into an internal mixer, and are mixed for 15min under the conditions of 50rpm of rotation speed and 180 ℃ of temperature, and injection molding feed containing the modified stainless steel powder and the cationic binder is obtained.
The melt index of the injection molding feed of this example was 33.8g/10min at a temperature of 190 ℃ under a 5kg load test; green density of 5.17g/cm with injection molded feed 3 And the green bending modulus is 2086MPa.
In order to compare the degree of improvement of the properties of the stainless steel powder modified by the stearate surfactant and the polymer containing the cationic side chain on the aspects of green body density, strength and the like through electrostatic interaction, as a comparative test, the feed is prepared by adopting unmodified stainless steel powder and the polymer containing the cationic side chain, and the melt index, the density and the bending strength of the feed are compared on the premise that the powder loading amount of each group of comparative examples is the same as that of the corresponding examples.
Comparative example 1
239.616g of unmodified stainless steel powder, 13.967g of methyl methacrylate-methacryloyloxyethyl trimethyl ammonium chloride polymer containing cationic side chains and 6.099g of polyethylene glycol are added into an internal mixer, and are mixed for 15min under the conditions of the rotating speed of 50rpm and the temperature of 180 ℃, so that injection molding feed containing the unmodified stainless steel powder and the cationic binder is obtained.
Comparative example 2
239.616g of unmodified stainless steel powder, 14.074g of methyl methacrylate-dimethyldiallylammonium chloride polymer containing cationic side chains and 6.177g of polyethylene glycol are added into an internal mixer, and are mixed for 15min under the conditions of the rotating speed of 50rpm and the temperature of 180 ℃ to obtain injection molding feed containing the unmodified stainless steel powder and the cationic binder.
Comparative example 3
239.616g of unmodified stainless steel powder, 13.784g of a polymer methyl methacrylate-acryloyloxyethyl trimethyl ammonium chloride containing a cationic side chain and 6.055g of polyethylene glycol are added into an internal mixer and mixed for 15min under the conditions of a rotating speed of 50rpm and a temperature of 180 ℃, and injection molding feed containing the unmodified stainless steel powder and the cationic binder is obtained.
Comparative example 4
240.078g of unmodified stainless steel powder, 11.033g of a polymer methyl methacrylate-acryloyloxyethyl trimethyl ammonium chloride containing a cationic side chain and 7.014g of polyethylene glycol are added into an internal mixer, and are mixed for 15min at the rotating speed of 50rpm and the temperature of 180 ℃ to obtain injection molding feed containing the unmodified stainless steel powder and the cationic binder.
As can be seen from the above table, the injection molding feed composed of stearate modified stainless steel powder and cationic binder of the present invention has improved mechanical properties and density compared to the injection molding feed composed of unmodified stainless steel powder and cationic binder of the comparative example, and the density of the green compact is also significantly improved.
It will be understood by those skilled in the art that the foregoing is only illustrative of the preferred embodiments 1-4 of the present invention, and is not intended to limit the invention, and that any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention are included within the scope of the present invention.
Claims (5)
1. An injection molding feed with modified stainless steel powder and a cationic binder, characterized in that: is prepared by mixing 92 to 95 mass portions of stearate modified stainless steel powder, 3.0 to 4.5 mass portions of cationic polymer and 2.0 to 3.5 mass portions of polyethylene glycol;
the preparation operation steps are as follows:
(1) Carrying out surface treatment on stainless steel powder by using stearate to obtain modified stainless steel powder;
(2) Adding Methyl Methacrylate (MMA) and a functional monomer containing a cationic side chain into an N, N-dimethylformamide solvent with the mass concentration of 55% for solution copolymerization to obtain a polymer containing the cationic side chain;
(3) Mixing the polymer containing the cationic side chain, polyethylene glycol and modified stainless steel powder together in an internal mixer to obtain an injection molding feed;
under the test conditions of 190 ℃ and 5kg load, the melt index of the injection molding feed is 31.5-36.7 g/10min; the density of the green body made of injection molding feed is 5.07-5.17 g/cm 3 And the bending modulus of the green body is 1478-2086 MPa.
2. The injection molding feed with modified stainless steel powder and cationic binder of claim 1, wherein: the functional monomer containing the cationic side chain is one of methacryloyloxyethyl trimethyl ammonium chloride (DMC), acryloxyethyl trimethyl ammonium chloride (DAC) or dimethyl diallyl ammonium chloride (DMDAAC).
3. The injection molding feed with modified stainless steel powder and cationic binder of claim 1, wherein: in the step (1), 32g of sodium stearate is added into 150mL of acetone solvent, mixed, stirred and dissolved uniformly to obtain a sodium stearate surface modifier; adding 8Kg of stainless steel powder into a high-speed mixer, heating to 140 ℃, uniformly adding sodium stearate surface modifier for three times, wherein the adding amount is 50g each time, and mixing for 30min at the rotating speed of 800rpm to obtain the stearate modified stainless steel powder.
4. The injection molding feed with modified stainless steel powder and cationic binder of claim 1, wherein: in the step (2), 90 to 95g of Methyl Methacrylate (MMA), 9.5 to 19.5g of functional monomer containing a cationic side chain and 127 to 134g of N, N-dimethylformamide solution (DMF) with the mass concentration of 55% are uniformly mixed and divided into two mixtures; adding the first part of the mixture into a container with a stirrer and a condenser pipe, and introducing nitrogen for 30min to discharge air; adding 1.054 to 1.094g of initiator azobisisobutyronitrile into the other mixture, slowly dripping the initiator into the first mixture through a constant pressure funnel for 1h, and carrying out oil bath reaction at the constant temperature of 80 ℃ for 10h to obtain a product; dropwise adding the product into 2L of methanol with the purity of 99.5% to obtain a precipitate; washing the precipitate with 500ml deionized water for three times, and then washing the precipitate with 500ml methanol with the purity of 99.5% for three times to obtain a purified product; and drying for 12 hours in a vacuum drying oven at 70 ℃ to obtain the polymer containing the cationic side chain, wherein the polymer is polymethyl methacrylate-methacryloyloxyethyl trimethyl ammonium chloride.
5. The injection molding feed with modified stainless steel powder and cationic binder of claim 1, wherein: in the step (3), 240.574 to 241.092g of modified stainless steel powder, 12.112 to 12.520g of polymer containing a cationic side chain and 5.214 to 5.489g of polyethylene glycol are added into an internal mixer, and the mixture is mixed for 15min at the rotating speed of 50rpm and the temperature of 180 ℃ to obtain the injection molding feed containing the modified stainless steel powder and the cationic binder.
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| US20150080495A1 (en) * | 2013-07-11 | 2015-03-19 | Kurt E. Heikkila | Surface modified particulate and sintered or injection molded products |
| CN114700498A (en) * | 2017-08-18 | 2022-07-05 | 通用电气公司 | Thermoplastic adhesive for adhesive jet additive manufacturing |
| CN112135702A (en) * | 2018-05-15 | 2020-12-25 | 霍加纳斯股份有限公司 | A binder composition for a metal injection molding raw material; a metal injection molding raw material containing the binder composition; metal injection molding method using the same, and product obtained by the method |
| CN112658246A (en) * | 2020-12-17 | 2021-04-16 | 合肥工业大学 | Injection molding feed of stainless steel powder and preparation method |
| CN113458384A (en) * | 2021-06-29 | 2021-10-01 | 合肥工业大学 | Modified stainless steel powder injection molding feed and preparation method thereof |
| CN114559042A (en) * | 2022-03-08 | 2022-05-31 | 合肥工业大学 | Preparation method of injection molding feed containing surface-treated stainless steel powder and functionalized binder |
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