CN115464135B - 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
- Publication number
- CN115464135B CN115464135B CN202211149359.6A CN202211149359A CN115464135B CN 115464135 B CN115464135 B CN 115464135B CN 202211149359 A CN202211149359 A CN 202211149359A CN 115464135 B CN115464135 B CN 115464135B
- Authority
- CN
- China
- Prior art keywords
- stainless steel
- steel powder
- cationic
- injection molding
- feed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
-
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/80—Food processing, e.g. use of renewable energies or variable speed drives in handling, conveying or stacking
- Y02P60/87—Re-use of by-products of food processing for fodder production
Abstract
The present invention relates to a kind ofThe injection molding feed with modified stainless steel powder and cationic binder belongs to the field of metal powder injection molding technology. The preparation operation steps are as follows: (1) Carrying out surface treatment on the stainless steel powder by using stearate to obtain modified stainless steel powder; (2) Methyl Methacrylate (MMA) and a functional monomer containing a cationic side chain are added into an N, N-dimethylformamide solvent with the mass concentration of 55% for solution copolymerization, so that a polymer containing the cationic side chain is obtained; (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 injection molding feed; the melt index is 31.5-36.7 g/10min (190 ℃,5 kg). The components in the formula of the invention are matched with each other, and the density of the prepared green compact is 5.07-5.17 g/cm under 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 in particular relates to a metal injection molding feed composed of modified stainless steel powder and a cationic polymer binder and a preparation method thereof.
Background
The metal powder injection molding technology (Metal powder injection molding) is formed in the 80 s of the 20 th century, and the Metal Injection Molding (MIM) technology is widely applied to industrial production, plays an important role in the production of miniature metal parts with complex geometric shapes and high requirements on product precision, has the manufacturing cost far lower than that of other processing methods, remarkably improves the utilization rate of materials, and is widely applied to industries such as automobiles, medical appliances, electronic appliances, IT and the like.
Metal injection molding is the most important procedure in the whole process flow, and the product is easy to crack, insufficient in filling, bubble holes and other problems in the process, so that the quality of subsequent products is affected, and even the rejection of the whole batch of products is possible. At present, the Metal Injection Molding (MIM) process still has many defects, most of which are caused by the problems of the binder itself, such as uneven distribution between the metal powder and the binder, and poor compatibility, so that the metal powder and the binder are mixed to generate common problems of phase separation, poor green performance, poor degreasing and shape retention, and poor dimensional stability. Therefore, to reduce these production problems, the preparation and selection of the binder are started, so that the binder preparation technology is the most important part in the current metal powder injection molding, and is an important starting point for promoting the progress and development of the metal powder injection molding technology.
Disclosure of Invention
In order to achieve the aim of improving the green body performance on the premise of ensuring the good fluidity of the feed, the invention provides an injection molding feed with modified stainless steel powder and a cationic-type 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 the stainless steel powder by using stearate to obtain modified stainless steel powder;
(2) Methyl Methacrylate (MMA) and a functional monomer containing a cationic side chain are added into an N, N-dimethylformamide solvent with the mass concentration of 55% for solution copolymerization, so that a polymer containing the cationic side chain is obtained;
(3) Mixing the polymer containing the cationic side chain, polyethylene glycol and modified stainless steel powder together in an internal mixer to obtain 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; green density 5.07-5.17 g/cm with injection molded feed 3 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 methacryloxyethyl trimethyl ammonium chloride (DMC) or acryloxyethyl trimethyl ammonium chloride (DAC) or dimethyl diallyl ammonium chloride (DMDAAC).
In the step (1), adding 32g of sodium stearate into 150mL of acetone solvent, and uniformly stirring to obtain a sodium stearate surface modifier; adding 8Kg of stainless steel powder into a high-speed mixer, heating to 140 ℃, uniformly adding the sodium stearate surface modifier for three times, wherein the adding amount of each time is 50g, and mixing for 30min at the speed of 800rpm to obtain the stainless steel powder modified by stearate.
In the step (2), 90-95 g of Methyl Methacrylate (MMA), 9.5-19.5 g of functional monomer containing a cationic side chain and 127-134 g of N, N-dimethylformamide solution (DMF) with the mass concentration of 55% are uniformly mixed and divided into two parts of mixtures; adding the first part of mixture into a container with a stirrer and a condenser tube, introducing nitrogen for 30min, and discharging air; adding 1.054-1.094 g of initiator azodiisobutyronitrile into the other part of mixture, slowly dripping the initiator azodiisobutyronitrile into the first part of mixture through a constant pressure funnel for 1h, and carrying out oil bath reaction at a 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; then washing the precipitate with 500ml deionized water three times, and washing the precipitate with 500ml methanol with purity of 99.5% three times to obtain purified product; drying for 12 hours in a vacuum drying oven at 70 ℃ to obtain a polymer containing a cationic side chain, wherein the polymer is polymethyl methacrylate-methacryloyloxyethyl trimethyl ammonium chloride.
In the step (3), 240.574-241.092 g of modified stainless steel powder, 12.112-12.520 g of polymer containing cationic side chains and 5.214-5.489 g of polyethylene glycol are added into an internal mixer, and mixed for 15min at the rotating speed of 50rpm and the temperature of 180 ℃ to obtain injection molding feed with the modified stainless steel powder and the cationic binder.
The beneficial technical effects of the invention are as follows:
1. the invention uses stearate modified stainless steel powder and cationic binder as raw materials to prepare injection molding feed. Stearate is used as a surfactant, and a stearate negative charge layer can be formed on the surface of positively charged metal powder through physical blending, so that the surface energy of the metal powder is reduced, the agglomeration among the powder is effectively improved, and the dispersion uniformity of stainless steel powder in a binder is improved. On the other hand, in the process of preparing injection molding feed with the cationic-containing binder, a large number of anionic groups on the surface of the stearate-modified stainless steel powder can be subjected to electrostatic interaction with cationic side chains in the cationic-containing binder, so that the interfacial binding force between two phases is improved, the compatibility between two components of the injection molding feed is improved, and the mechanical property of a blank body is improved.
2. The powder loading capacity 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 condition of the temperature of 190 ℃ and the load of 5kg, the prepared green density is 5.07-5.17 g/cm < 3 >, and the prepared green flexural modulus is 1478-2086 MPa. The components in the formula are matched with each other, and the purpose of improving the green body performance is achieved on the premise of ensuring the good fluidity of the feed.
Drawings
FIG. 1 is a flow chart of the preparation of an injection molded 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 invention is further illustrated below with reference to examples.
The sources of the materials used in the following examples are described below:
the materials used in the present invention are commercially available except for the cationic polymer used, for example, stainless steel powder used in the present invention is produced by Sandvik Osprey, UK, polyethylene glycol and N, N-dimethylformamide are produced by the national drug group. The other raw materials are all common materials which are known and commonly used, and can be produced by various manufacturers and purchasing modes.
Example 1
Referring to fig. 1, an injection molding feed with modified stainless steel powder and cationic binder was prepared as follows:
(1) Preparation of stearate modified stainless Steel powder
32g of sodium stearate and 150mL of acetone are added into a beaker, stirred and dissolved uniformly, and the sodium stearate surface modifier is obtained. Adding 8Kg of stainless steel powder into a high-speed mixer, heating to 140 ℃, uniformly adding the sodium stearate surface modifier for three times, wherein the adding amount of each time is 50g, and mixing for 30min at the speed of 800rpm to obtain the stainless steel powder modified by stearate.
(2) Preparation of polymers containing cationic side chains
95g of Methyl Methacrylate (MMA), 10.4g of methacryloyloxyethyl trimethyl ammonium chloride (DMC) and 128.82g of an N, N-dimethylformamide solution (DMF) with a mass concentration of 55% are uniformly mixed and divided into two parts of mixtures; adding the first part of mixture into a three-neck flask with a stirrer and a condenser tube, introducing nitrogen for 30min, and discharging air; 1.054g of initiator azodiisobutyronitrile is added into the other part of mixture, and then the initiator azodiisobutyronitrile is slowly added into the first part of mixture by a constant pressure funnel for 1h, and the product is obtained by oil bath reaction at the constant temperature of 80 ℃ for 10 h; dropwise adding the product into 2L of methanol with the purity of 99.5% to obtain a precipitate; then washing the precipitate with 500ml deionized water three times, and washing the precipitate with 500ml methanol with purity of 99.5% three times to obtain purified product; drying for 12 hours in a vacuum drying oven at 70 ℃ to obtain a polymer containing a cationic side chain, wherein the polymer is polymethyl methacrylate-methacryloyloxyethyl trimethyl ammonium chloride.
(3) Preparation of injection molded feeds
240.574g of modified stainless steel powder, 12.413g of polymer containing cationic side chains and 5.411g of polyethylene glycol are added into an internal mixer, and mixed for 15min at the temperature of 180 ℃ at the rotation speed of 50rpm, so as to obtain injection molding feed with the modified stainless steel powder and the cationic binder.
The injection molded feed of this example had a melt index of 31.5g/10min at 190℃under a 5kg load test; green density 5.07g/cm with injection molded feed 3 The green flexural modulus was 1478MPa.
Referring to FIG. 2, stearate has a large number of anionic groups [ ]
) During the blending process of stearate and stainless steel powder, stearate can be adsorbed on the surface of stainless steel powder with positive charges on the surface
) So that the outermost layer of the stainless steel powder coated by stearate forms a negative charge layer
). In the process of preparing the feed, a negative charge layer formed on the surface of the stainless steel powder can be in electrostatic interaction with a cationic side chain containing a cationic polymer in the binder.
Example 2
The preparation operation steps of the injection molding feed with 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, stirred and dissolved uniformly, and the sodium stearate surface modifier is obtained. Adding 8Kg of stainless steel powder into a high-speed mixer, heating to 140 ℃, uniformly adding the sodium stearate surface modifier for three times, wherein the adding amount of each time is 50g, and mixing for 30min at the speed of 800rpm to obtain the stainless steel powder modified by stearate.
(2) Preparation of polymers containing cationic side chains
95g of Methyl Methacrylate (MMA), 11.738g of dimethyl diallyl ammonium chloride (DMDAAC) and 130.456g of an N, N-dimethylformamide solution (DMF) with a mass concentration of 55% are uniformly mixed and divided into two parts of mixtures; adding the first part of mixture into a three-neck flask with a stirrer and a condenser tube, introducing nitrogen for 30min, and discharging air; adding 1.067g of initiator azodiisobutyronitrile into the other part of mixture, slowly dripping the initiator azodiisobutyronitrile into the first part of mixture through a constant pressure funnel for 1h, and carrying out oil bath reaction at a 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; then washing the precipitate with 500ml deionized water three times, and washing the precipitate with 500ml methanol with purity of 99.5% three times to obtain purified product; drying for 12 hours in a vacuum drying oven at 70 ℃ to obtain a polymer containing a cationic side chain, wherein the polymer is polymethyl methacrylate-dimethyl diallyl ammonium chloride.
(3) Preparation of injection molded feeds
240.574g of modified stainless steel powder, 12.520g of polymer containing cationic side chains and 5.489g of polyethylene glycol are added into an internal mixer, and mixed for 15min at the temperature of 180 ℃ at the rotation speed of 50rpm, so as to obtain injection molding feed with the modified stainless steel powder and the cationic binder.
The injection molded feed of this example had a melt index of 34.5g/10min at 190℃under 5kg load; green density 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 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, stirred and dissolved uniformly, and the sodium stearate surface modifier is obtained. Adding 8Kg of stainless steel powder into a high-speed mixer, heating to 140 ℃, uniformly adding the sodium stearate surface modifier for three times, wherein the adding amount of each time is 50g, and mixing for 30min at the speed of 800rpm to obtain the stainless steel powder modified by stearate.
(2) Preparation of polymers containing cationic side chains
95g of Methyl Methacrylate (MMA), 9.68g of acryloyloxyethyl trimethyl ammonium chloride (DAC) and 127.95g of an N, N-dimethylformamide solution (DMF) with a mass concentration of 55% are uniformly mixed and divided into two parts of mixtures; adding the first part of mixture into a three-neck flask with a stirrer and a condenser tube, introducing nitrogen for 30min, and discharging air; adding 1.047g of initiator azodiisobutyronitrile into the other part of mixture, slowly dripping the initiator azodiisobutyronitrile into the first part of mixture through a constant pressure funnel for 1h, and carrying out oil bath reaction at a 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; then washing the precipitate with 500ml deionized water three times, and washing the precipitate with 500ml methanol with purity of 99.5% three times to obtain purified product; drying for 12 hours in a vacuum drying oven at 70 ℃ to obtain a polymer containing a cationic side chain, wherein the polymer is polymethyl methacrylate-acryloyloxyethyl trimethyl ammonium chloride.
(3) Preparation of injection molded feeds
240.574g of modified stainless steel powder, 12.230g of polymer containing cationic side chains and 5.367g of polyethylene glycol are added into an internal mixer, and mixed for 15min at the temperature of 180 ℃ at the rotation speed of 50rpm, so as to obtain injection molding feed with the modified stainless steel powder and the cationic binder.
The injection molded feed of this example had a melt index of 36.7g/10min at 190℃under 5kg load; green density 5.16g/cm with injection molded feed 3 The green flexural modulus was 1799MPa.
Example 4
The preparation operation steps of the injection molding feed with 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, stirred and dissolved uniformly, and the sodium stearate surface modifier is obtained. Adding 8Kg of stainless steel powder into a high-speed mixer, heating to 140 ℃, uniformly adding the sodium stearate surface modifier for three times, wherein the adding amount of each time is 50g, and mixing for 30min at the speed of 800rpm to obtain the stainless steel powder modified by stearate.
(2) Preparation of polymers containing cationic side chains
90g of Methyl Methacrylate (MMA), 19.367g of acryloyloxyethyl trimethyl ammonium chloride (DAC) and 133.67g of an N, N-dimethylformamide solution (DMF) with a mass concentration of 55% are uniformly mixed and divided into two parts; adding the first part of mixture into a three-neck flask with a stirrer and a condenser tube, introducing nitrogen for 30min, and discharging air; adding 1.094g of initiator azodiisobutyronitrile into the other part of mixture, slowly dripping the initiator azodiisobutyronitrile into the first part of mixture through a constant pressure funnel for 1h, and carrying out oil bath reaction at a 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; then washing the precipitate with 500ml deionized water three times, and washing the precipitate with 500ml methanol with purity of 99.5% three times to obtain purified product; drying for 12 hours in a vacuum drying oven at 70 ℃ to obtain a polymer containing a cationic side chain, wherein the polymer is polymethyl methacrylate-acryloyloxyethyl trimethyl ammonium chloride.
(3) Preparation of injection molded feeds
241.092g of modified stainless steel powder, 12.112g of polymer containing cationic side chains and 5.214g of polyethylene glycol are added into an internal mixer, and mixed for 15min at the temperature of 180 ℃ at the rotation speed of 50rpm, so as to obtain injection molding feed with the modified stainless steel powder and the cationic binder.
The injection molded feed of this example had a melt index of 33.8g/10min at 190℃under 5kg load; green density 5.17g/cm with injection molded feed 3 The green flexural modulus was 2086MPa.
In order to compare the degree of performance improvement in terms of green density and strength, etc., of electrostatic interactions between the stearate surfactant modified stainless steel powder and the polymer containing cationic side chains, as a comparative test, the invention also used unmodified stainless steel powder and the polymer containing cationic side chains to prepare a feed, and each comparative example compared the melt index, density and flexural strength of the feed with the corresponding examples under the same powder loading.
Comparative example 1
239.616g of unmodified stainless steel powder, 13.967g of polymer methyl methacrylate-methacryloyloxyethyl trimethyl ammonium chloride containing cationic side chains and 6.099g of polyethylene glycol were added to an internal mixer, and kneaded at a rotation speed of 50rpm and a temperature of 180℃for 15 minutes to obtain an injection molding feed of the unmodified stainless steel powder and a cationic binder.
Comparative example 2
239.616g of unmodified stainless steel powder, 14.074g of polymer methyl methacrylate-dimethyldiallylammonium chloride containing cationic side chains and 6.177g of polyethylene glycol were added to an internal mixer, and mixed for 15min at a rotation speed of 50rpm and a temperature of 180 ℃ to obtain an injection molding feed of the unmodified stainless steel powder and the cationic binder.
Comparative example 3
239.616g of unmodified stainless steel powder, 13.784g of polymer methyl methacrylate-acryloyloxyethyl trimethyl ammonium chloride containing cationic side chains and 6.055g of polyethylene glycol are added into an internal mixer, and mixed for 15min at the temperature of 180 ℃ at the rotation speed of 50rpm, so as to obtain injection molding feed of the unmodified stainless steel powder and the cationic binder.
Comparative example 4
240.078g of unmodified stainless steel powder, 11.033g of polymer methyl methacrylate-acryloyloxyethyl trimethyl ammonium chloride containing cationic side chains and 7.014g of polyethylene glycol are added into an internal mixer, and mixed for 15min at the temperature of 180 ℃ at the rotation speed of 50rpm, so as to obtain injection molding feed of the unmodified stainless steel powder and the cationic binder.
As can be seen from the above table, the injection molding feed composed of the stearate modified stainless steel powder and the cationic binder of the invention has improved mechanical properties and density, and the green compact has significantly improved density compared with the injection molding feed composed of the unmodified stainless steel powder and the cationic binder of the comparative example.
It will be readily understood by those skilled in the art that the foregoing is merely illustrative of the preferred embodiments 1-4 of the present invention and that no limitations are intended to the scope of the invention, as defined by the appended claims.
Claims (4)
1. An injection molded feed having a modified stainless steel powder and a cationic binder, characterized by: is prepared by mixing 92-95 parts by mass of stearate modified stainless steel powder, 3.0-4.5 parts by mass of cationic polymer and 2.0-3.5 parts by mass of polyethylene glycol;
the preparation operation steps are as follows:
(1) Carrying out surface treatment on the stainless steel powder by using stearate to obtain modified stainless steel powder;
(2) Adding methyl methacrylate 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;
the specific operation is as follows: uniformly mixing 90-95 g of methyl methacrylate, 9.5-19.5 g of functional monomer containing a cationic side chain and 127-134 g of N, N-dimethylformamide solvent with mass concentration of 55%, and dividing into two parts of mixtures; adding the first part of mixture into a container with a stirrer and a condenser tube, introducing nitrogen for 30min, and discharging air; adding 1.054-1.094 g of initiator azodiisobutyronitrile into the other part of mixture, slowly dripping the initiator azodiisobutyronitrile into the first part of mixture through a constant pressure funnel for 1h, and carrying out oil bath reaction at a 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; then washing the precipitate with 500ml deionized water three times, and washing the precipitate with 500ml methanol with purity of 99.5% three times to obtain purified product; drying for 12 hours in a vacuum drying oven at 70 ℃ to obtain a polymer containing a cationic side chain, wherein the polymer is polymethyl methacrylate-methacryloyloxyethyl trimethyl ammonium chloride;
(3) Mixing the polymer containing the cationic side chain, polyethylene glycol and modified stainless steel powder together in an internal mixer to obtain 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; green density 5.07-5.17 g/cm with injection molded feed 3 The bending modulus of the green body is 1478-2086 MPa.
2. An injection molded feed with modified stainless steel powder and cationic binder according to claim 1, wherein: the functional monomer containing the cationic side chain is one of methacryloxyethyl trimethyl ammonium chloride (DMC) or acryloxyethyl trimethyl ammonium chloride (DAC) or dimethyl diallyl ammonium chloride (DMDAAC).
3. An injection molded feed with modified stainless steel powder and cationic binder according to claim 1, wherein: in the step (1), adding 32g of sodium stearate into 150mL of acetone solvent, mixing, stirring and dissolving uniformly to obtain a sodium stearate surface modifier; adding 8Kg of stainless steel powder into a high-speed mixer, heating to 140 ℃, uniformly adding the sodium stearate surface modifier for three times, wherein the adding amount of each time is 50g, and mixing for 30min at the speed of 800rpm to obtain the stainless steel powder modified by stearate.
4. An injection molded feed with modified stainless steel powder and cationic binder according to claim 1, wherein: in the step (3), 240.574-241.092 g of modified stainless steel powder, 12.112-12.520 g of polymer containing cationic side chains and 5.214-5.489 g of polyethylene glycol are added into an internal mixer, and mixed for 15min at the rotating speed of 50rpm and the temperature of 180 ℃ to obtain injection molding feed with the modified stainless steel powder and the cationic binder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211149359.6A CN115464135B (en) | 2022-09-21 | 2022-09-21 | Injection molding feed with modified stainless steel powder and cationic binder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211149359.6A CN115464135B (en) | 2022-09-21 | 2022-09-21 | Injection molding feed with modified stainless steel powder and cationic binder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115464135A CN115464135A (en) | 2022-12-13 |
| CN115464135B true CN115464135B (en) | 2023-06-23 |
Family
ID=84334890
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211149359.6A Active CN115464135B (en) | 2022-09-21 | 2022-09-21 | Injection molding feed with modified stainless steel powder and cationic binder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115464135B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2915662C (en) * | 2013-07-11 | 2022-04-26 | Tundra Composites, LLC | Surface modified particulate and sintered or injection molded products |
| US20190054527A1 (en) * | 2017-08-18 | 2019-02-21 | General Electric Company | Thermoplastic binders for use in binder jetting 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 |
| CN112658246B (en) * | 2020-12-17 | 2022-03-01 | 合肥工业大学 | Injection molding feed of stainless steel powder and preparation method |
| CN113458384B (en) * | 2021-06-29 | 2023-04-18 | 合肥工业大学 | Modified stainless steel powder injection molding feed and preparation method thereof |
| CN114559042B (en) * | 2022-03-08 | 2023-07-21 | 合肥工业大学 | Preparation method of injection molding feed containing surface-treated stainless steel powder and functionalized binder |
-
2022
- 2022-09-21 CN CN202211149359.6A patent/CN115464135B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN115464135A (en) | 2022-12-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109096481B (en) | Catalytic system for preparing polyether-containing polymer and preparation method of various polyether-containing polymers | |
| CN105860315A (en) | Preparing method of hexagonal boron nitride/polystyrene composite | |
| CN109926590B (en) | Preparation method of injection molding feed | |
| JPH07509743A (en) | Electrically conductive polyaniline: emulsion polymerization method | |
| CN104877058B (en) | A kind of polyacrylate resins 3D printing material and preparation method thereof | |
| CN111087782A (en) | Flame-retardant PCABS composition | |
| CN113061266B (en) | High-strength ionic gel based on multiple non-covalent crosslinking effects | |
| CN115464135B (en) | Injection molding feed with modified stainless steel powder and cationic binder | |
| CN112658246B (en) | Injection molding feed of stainless steel powder and preparation method | |
| CN113458384B (en) | Modified stainless steel powder injection molding feed and preparation method thereof | |
| CN114573874A (en) | Modified fullerene, anti-aging and antistatic ABS composite material and preparation method thereof | |
| CN114316509A (en) | PEEK-based composite wave-absorbing 3D printing wire material and preparation method thereof | |
| CN116589664A (en) | Synthesis method of polylactic acid grafted cycloolefin copolymer | |
| CN113583228B (en) | Synthesis method of polyester chip for high-temperature-resistant film | |
| CN112223578B (en) | Method for preparing high-toughness strontium ferrite/PPS injection molding granules through in-situ polymerization | |
| CN108864406B (en) | High-mechanical-strength GO/TPU in-situ polymerization method | |
| CN1334827A (en) | Powder coatings from cyclic carbonate functional polymers and amine carbamate salts | |
| CN110804309A (en) | 3D printing polymer powder material and preparation method thereof | |
| CN114058133B (en) | Preparation method of PS material with high creep resistance | |
| CN109957289A (en) | A kind of pencil-lead and preparation method thereof | |
| CN117487078B (en) | Halogen-free modified solution polymerized styrene-butadiene rubber and preparation method thereof | |
| CN109705266A (en) | Microspheroidal ionomer with cross-linked structure and its preparation method and application | |
| CN109705251A (en) | Microspheroidal ionomer with cross-linked structure and its preparation method and application | |
| CN117487175A (en) | Polyether polymer, preparation method thereof and application of polyether polymer in antistatic agent | |
| CN114805971A (en) | High-filling dynamic bond crosslinked polymer magnetic composite material and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |