CN114559042B - Preparation method of injection molding feed containing surface-treated stainless steel powder and functionalized binder - Google Patents
Preparation method of injection molding feed containing surface-treated stainless steel powder and functionalized binder Download PDFInfo
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- CN114559042B CN114559042B CN202210218550.5A CN202210218550A CN114559042B CN 114559042 B CN114559042 B CN 114559042B CN 202210218550 A CN202210218550 A CN 202210218550A CN 114559042 B CN114559042 B CN 114559042B
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
- B22F3/227—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 organic binder assisted extrusion
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Abstract
The invention relates to a preparation method of injection molding feed containing surface-treated stainless steel powder and a functionalized binder, belonging to the field of metal injection molding. The raw materials used include: stainless steel metal powder with carboxyl on the surface, stainless steel metal powder with hydroxyl on the surface, skeleton polymer with epoxy group at the tail end and microcrystalline wax. In the mixing and feeding process, firstly, respectively carrying out surface treatment on the stainless steel metal powder by using a carboxyl end modifier and a hydroxyl end modifier to obtain stainless steel metal powder with carboxyl and hydroxyl on the surface; and then respectively banburying with the functionalized skeleton polymer and the microcrystalline wax, under the interaction of chemical bonds, the compatibility and the compactness of the stainless steel metal powder with carboxyl groups and hydroxyl groups on the surfaces and the binder are enhanced, and on the premise of ensuring the feeding fluidity and the injection molding requirement, the feeding mixing uniformity is effectively improved, and the loading capacity of the feeding critical powder, the green density and the bending property are improved, and the shape retention of the directly thermally defatted green body is improved.
Description
Technical Field
The invention belongs to the technical field of metal injection molding, and particularly relates to a preparation method of an injection molding feed composed of modified stainless steel powder with carboxyl and hydroxyl on the surfaces and an epoxy-containing binder.
Background
Metal injection molding (Metal Injection Molding, MIM) is a near net shape powder metallurgy technique that integrates conventional powder metallurgy with plastic injection molding to produce complex geometry parts with high dimensional accuracy at a relatively low price. Compared with the traditional metal casting process, the metal casting process has the defects of high production cost, rough part surface, poor dimensional accuracy, difficult casting of small and complex metal parts, difficult mass production, and the metal injection molding technology can obtain small and exquisite parts with high dimensional accuracy and high mechanical strength, and is widely applied to the fields of medical equipment, electronic product elements, automobile metal accessories and the like.
The prior art of metal injection molding is mainly focused on the aspects of researching the shape and the particle size of metal powder, the formula of a binder, the processing technology such as degreasing and sintering and the like, but the research related to the surface treatment of the metal powder and the interaction of the metal powder and a functionalized binder for mixing and feeding is relatively less, and the interaction of the powder and the binder can better improve the problem of binder-powder phase separation.
The metal injection molding develops various feeding systems, such as feeding formed by mixing an ethylene-vinyl acetate copolymer (EVA), paraffin (PW), microcrystalline paraffin (MW), high-density polyethylene (HDPE) and Stearic Acid (SA) serving as a binder system and stainless steel powder, but most of the prepared feeding has the problems of poor compatibility between powder and binder, overlarge feeding viscosity, low powder loading capacity, small green density and the like, so that the green body has small mechanical strength, rough surface, even holes and cracks, bubbling, deformation and other defects after degreasing and sintering, and the precision and shape retention of the sintered part cannot meet the technical requirements of certain small special-shaped parts.
Disclosure of Invention
In order to solve the problem of phase separation caused by interaction between powder and a binder and further improve the performance of the feed, the invention provides a preparation method of an injection molding feed containing surface-treated stainless steel powder and a functionalized binder.
An injection molded feed containing surface treated stainless steel powder and functionalized binder is prepared by the following steps:
(1) Preparation of stainless Steel powder with carboxyl groups on the surface
(1.1) 100 parts of stainless steel powder was poured into a high-speed mixer;
(1.2) adding 0.3 part of carboxyl-terminated hyperbranched polyester and 0.4 part of acetone into a beaker, stirring and dissolving to obtain a carboxyl-terminated hyperbranched polyester modifier;
(1.3) adding 0.3 part of hydroxyl-terminated hyperbranched polyester and 0.4 part of acetone into a beaker, stirring and dissolving to obtain a hydroxyl-terminated hyperbranched polyester modifier;
(1.4) dropwise adding a modifier when the temperature of the stainless steel powder in the high-speed mixer reaches 130-140 ℃, wherein the modifier is a carboxyl-terminated hyperbranched polyester modifier or a hydroxyl-terminated hyperbranched polyester modifier; mixing for 40-60min at 850rpm to obtain surface-treated stainless steel powder;
(1.5) washing the stainless steel powder subjected to surface treatment by using acetone for multiple times, and drying in a forced air drying oven at the temperature of 85 ℃ for 4-6 hours to obtain stainless steel powder with carboxyl groups or hydroxyl groups on the surface;
(2) Preparation of injection molded feeds
Adding 93.2-93.9 weight percent of stainless steel powder with carboxyl or hydroxyl on the surface, 3.8-4.2 weight percent of skeleton polymer and 2.3-2.6 weight percent of microcrystalline wax into a banburying chamber, and mixing for 15-30min at the rotating speed of 50-100rpm and the temperature of 140-160 ℃ to obtain injection molding feed of the surface treated stainless steel metal powder and the functionalized binder;
the powder volume loading of the injection molding feed of the surface-treated stainless steel metal powder and the functionalized binder is 60.5-63.5 vol%; the green density is 5.02-5.16 g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The flexural modulus is 4200-4500 Mpa, and the dimensional change rate of the green body after degreasing is 0.5-1.5%.
The technical scheme is as follows:
in the step (1.4), the carboxyl-terminated hyperbranched polyester modifier is prepared by dissolving 0.3 part of carboxyl-terminated hyperbranched polyester in 0.4 part of acetone.
In the step (1.4), the hydroxyl-terminated hyperbranched polyester modifier is prepared by dissolving 0.3 part of hydroxyl-terminated hyperbranched polyester in 0.4 part of acetone.
The beneficial technical effects of the invention are as follows:
1. the invention adopts carboxyl-terminated or hydroxyl-terminated hyperbranched polyester to carry out surface treatment on stainless steel powder, adopts glycidyl methacrylate grafted high-density polyethylene (HDPE) with epoxy groupsg-GMA) is a skeleton polymer in the adhesive, and two stainless steel powders with carboxyl groups and hydroxyl groups on the surfaces are respectivelyChemical interaction with epoxy groups of the functionalized binder skeleton polymer is carried out, so that chemical bond connection is generated between the stainless steel powder and the binder, the connection between the stainless steel powder and the binder is more compact, the phase separation phenomenon is effectively reduced, the feeding mixing uniformity is improved, the feeding critical powder loading capacity is improved, and the powder volume loading capacity can reach 60.5-63.5 vol%; on the premise of ensuring good fluidity of the feed, the green density is improved, and reaches 5.02-5.16 g/cm 3 The mechanical property of the green body is enhanced, and the flexural modulus reaches 4100-4500 Mpa; the shape retention after degreasing is improved, the dimensional change rate of the green body after degreasing reaches 0.5-1.5%, and adverse phenomena such as bubbling, cracking, holes and the like do not occur.
2. The preparation method of the modified stainless steel powder is dry modification, and the modified stainless steel powder can be used as a raw material for injection molding by fully and uniformly stirring different modifying agents and the stainless steel powder, so that the process is simple and convenient.
Drawings
FIG. 1 is a flow chart of the preparation of an injection molded feed of the present invention.
FIG. 2 (a) is a schematic representation of the interaction of a powder bearing carboxyl groups on the surface with an epoxy-containing binder.
FIG. 2 (b) is a schematic representation of the interaction of a powder bearing hydroxyl groups on the surface with an epoxy-containing binder.
Description of the embodiments
The invention is further described by way of examples with reference to the accompanying drawings.
The raw materials used in this example 1 were as follows: 257.703g (93.27%) of stainless steel powder with carboxyl groups on the surface, 11.508g (4.17%) of a backbone polymer glycidyl methacrylate grafted High Density Polyethylene (HDPE)gGMA), 7.078g (2.56%) microcrystalline wax.
Referring to fig. 1, a method for preparing an injection molded feed of surface treated stainless steel powder with a functionalized binder is as follows:
(1) Preparation of stainless Steel powder with carboxyl groups on the surface
(1.1) weighing 100g of stainless steel powder in parts by mass, and pouring the stainless steel powder into a high-speed mixer;
(1.2) weighing 0.3g of carboxyl-terminated hyperbranched polyester and 0.4g of acetone, pouring the materials into a beaker, and stirring and dissolving to obtain the carboxyl-terminated hyperbranched polyester modifier;
(1.3) dripping the modifier onto the surface of the stainless steel powder in the mixer when the temperature of the stainless steel powder in the high-speed mixer reaches 130 ℃, mixing for 45min at 850rpm, and taking out the stainless steel powder with the surface treated;
(1.4) washing the surface-treated stainless steel powder with acetone for a plurality of times, and drying the stainless steel powder in a forced air drying oven at 85 ℃ for 4 hours to obtain the stainless steel powder with carboxyl on the surface.
(2) Preparation of injection molded feeds
257.703g of stainless steel powder with carboxyl groups on the surface, 11.508g of skeleton polymer and 7.078g of microcrystalline wax are weighed and added into a banburying chamber, and mixed for 30min at the temperature of 150 ℃ at the rotating speed of 60rpm, so as to obtain injection molding feed composed of the stainless steel metal powder with carboxyl groups on the surface and the functionalized binder. As can be seen from fig. 2 (a), the carboxyl groups on the stainless steel powder surface chemically react with the epoxy groups on the adhesive surface to form chemical bond connection.
The injection molded feed prepared in this example 1 had a powder volume loading of 61 vol% and a green density of 5.07g/cm 3 The green body after direct thermal degreasing had a flexural modulus of 4394 MPa and a dimensional change of 0.74%.
The raw materials used in this example 2 were as follows: 261.927g (93.54%) of stainless steel powder with carboxyl groups on the surface, 11.2g (4.00%) of a backbone polymer glycidyl methacrylate grafted High Density Polyethylene (HDPE)gGMA), 6.688g (2.46%) microcrystalline wax.
Referring to fig. 1, a method for preparing an injection molded feed of surface treated stainless steel powder with a functionalized binder is as follows:
(1) Preparation of stainless Steel powder with carboxyl groups on the surface
(1.1) weighing 100g of stainless steel powder in parts by mass, and pouring the stainless steel powder into a high-speed mixer;
(1.2) weighing 0.3g of carboxyl-terminated hyperbranched polyester and 0.4g of acetone, pouring the materials into a beaker, and stirring and dissolving to obtain the carboxyl-terminated hyperbranched polyester modifier;
(1.3) dripping the modifier onto the surface of the stainless steel powder in the mixer when the temperature of the stainless steel powder in the high-speed mixer reaches 130 ℃, mixing for 45min at 850rpm, and taking out the stainless steel powder with the surface treated;
(1.4) washing the stainless steel powder with acetone for a plurality of times, and drying the stainless steel powder in a forced air drying oven at 85 ℃ for 4 hours to obtain the stainless steel powder with carboxyl on the surface.
(2) Preparation of stainless Steel Metal powder injection Molding feed
261.927g of stainless steel powder with carboxyl groups on the surface, 11.2g of skeleton polymer and 6.688g of microcrystalline wax are weighed and added into a banburying chamber, and mixed for 30min at the rotation speed of 60rpm and the temperature of 150 ℃ to obtain injection molding feed composed of the stainless steel metal powder with carboxyl groups on the surface and a functionalized binder. As can be seen from fig. 2 (a), the carboxyl groups on the stainless steel powder surface chemically react with the epoxy groups on the adhesive surface to form chemical bond connection.
The injection molded feed prepared in this example 2 had a powder volume loading of 62 vol% and a green density of 5.12 g/cm 3 The green body after direct thermal degreasing had a flexural modulus of 4423 MPa and a dimensional change rate of 0.61%.
The raw materials used in this example 3 were as follows: 268.264g (93.93%) of stainless steel powder with carboxyl groups on the surface, 10.738g (3.76%) of a backbone polymer glycidyl methacrylate grafted High Density Polyethylene (HDPE)gGMA), 6.604g (2.31%) microcrystalline wax.
Referring to fig. 1, a method for preparing an injection molded feed of surface treated stainless steel powder with a functionalized binder is as follows:
(1) Preparation of stainless Steel powder with carboxyl groups on the surface
(1.1) weighing 100g of stainless steel powder in parts by mass, and pouring the stainless steel powder into a high-speed mixer;
(1.2) weighing 0.3g of carboxyl-terminated hyperbranched polyester and 0.4g of acetone, pouring the materials into a beaker, and stirring and dissolving to obtain the carboxyl-terminated hyperbranched polyester modifier;
(1.3) dripping the modifier onto the surface of the stainless steel powder in the mixer when the temperature of the stainless steel powder in the high-speed mixer reaches 130 ℃, mixing for 45min at 850rpm, and taking out the stainless steel powder with the surface treated;
(1.4) washing the stainless steel powder with acetone for a plurality of times, and drying the stainless steel powder in a forced air drying oven at 85 ℃ for 4 hours to obtain the stainless steel powder with carboxyl on the surface.
(2) Preparation of stainless Steel Metal powder injection Molding feed
268.264g of stainless steel powder with carboxyl groups on the surface, 10.738g of skeleton polymer and 6.604g of microcrystalline wax are weighed and added into a banburying chamber, and mixed for 30min at the rotation speed of 60rpm and the temperature of 150 ℃ to obtain injection molding feed composed of the stainless steel powder with carboxyl groups on the surface and a functionalized binder. As can be seen from fig. 2 (a), the carboxyl groups on the stainless steel powder surface chemically react with the epoxy groups on the adhesive surface to form chemical bond connection.
The injection molded feed prepared in this example 3 had a powder volume loading of 63.5vol% and a green density of 5.16g/cm 3 The green body after direct thermal degreasing had a flexural modulus of 4467 MPa and a dimensional change rate of 0.50%.
The raw materials used in this example 4 were as follows: 257.703g (93.29%) of stainless steel powder with hydroxyl groups on the surface, 11.469g (4.15%) of a backbone polymer glycidyl methacrylate grafted High Density Polyethylene (HDPE)gGMA), 7.054g microcrystalline wax (2.55%).
Referring to fig. 1, a method for preparing an injection molded feed of surface treated stainless steel powder with a functionalized binder is as follows:
(1) Preparation of stainless Steel powder with hydroxyl groups on the surface
(1.1) weighing 100g of stainless steel powder in parts by mass, and pouring the stainless steel powder into a high-speed mixer;
(1.2) weighing 0.3g of hydroxyl-terminated hyperbranched polyester and 0.4g of acetone, pouring the materials into a beaker, and stirring and dissolving to obtain a hydroxyl-terminated hyperbranched polyester modifier;
(1.3) dripping the modifier onto the surface of the stainless steel powder in the mixer when the temperature of the stainless steel powder in the high-speed mixer reaches 130 ℃, mixing at 850rpm for 45min, and taking out the stainless steel powder after surface treatment;
(1.4) washing the stainless steel powder with acetone for a plurality of times, and drying the stainless steel powder in a forced air drying oven at 85 ℃ for 4 hours to obtain the stainless steel powder with hydroxyl groups on the surface.
(2) Preparation of stainless Steel Metal powder injection Molding feed
257.703g of stainless steel powder with hydroxyl groups on the surface, 11.469g of skeleton polymer and 7.054g of microcrystalline wax are weighed and added into a banburying chamber, and mixed for 30min at the rotation speed of 60rpm and the temperature of 150 ℃ to obtain injection molding feed composed of the stainless steel metal powder with carboxyl groups on the surface and the functionalized binder. As can be seen from fig. 2 (b), the hydroxyl groups on the stainless steel powder surface chemically react with the epoxy groups on the adhesive surface to form chemical bond linkages.
The injection molded feed prepared in this example 4 had a powder volume loading of 61 vol% and a green density of 4.97g/cm 3 The flexural modulus was 4133 MPa and the dimensional change rate of the green body after direct thermal degreasing was 1.48%.
The raw materials used in this example 5 were as follows: 261.927g (93.56%) of stainless steel powder with hydroxyl groups on the surface, 11.16g (3.99%) of a backbone polymer glycidyl methacrylate grafted High Density Polyethylene (HDPE)gGMA), 6.864g (2.45%) microcrystalline wax.
Referring to fig. 1, a method for preparing an injection molded feed of surface treated stainless steel powder with a functionalized binder is as follows:
(1) Preparation of stainless Steel powder with hydroxyl groups on the surface
(1.1) weighing 100g of stainless steel powder in parts by mass, and pouring the stainless steel powder into a high-speed mixer;
(1.2) weighing 0.3g of hydroxyl-terminated hyperbranched polyester and 0.4g of acetone, pouring the materials into a beaker, and stirring and dissolving to obtain a hydroxyl-terminated hyperbranched polyester modifier;
(1.3) dripping the modifier onto the surface of the stainless steel powder in the mixer when the temperature of the stainless steel powder in the high-speed mixer reaches 130 ℃, mixing at 850rpm for 45min, and taking out the stainless steel powder after surface treatment;
(1.4) washing the stainless steel powder with acetone for a plurality of times, and drying the stainless steel powder in a forced air drying oven at 85 ℃ for 4 hours to obtain the stainless steel powder with hydroxyl groups on the surface.
(2) Preparation of stainless Steel Metal powder injection Molding feed
261.927g of stainless steel powder with hydroxyl groups on the surface, 11.16g of skeleton polymer and 6.864g of microcrystalline wax are weighed and added into a banburying chamber, and mixed for 30min at the rotation speed of 60rpm and the temperature of 150 ℃ to obtain injection molding feed composed of the stainless steel metal powder with carboxyl groups on the surface and the functionalized binder. As can be seen from fig. 2 (b), the hydroxyl groups on the stainless steel powder surface chemically react with the epoxy groups on the adhesive surface to form chemical bond linkages.
The injection molded feed prepared in this example 5 had a powder volume loading of 62 vol% and a green density of 5.02 g/cm 3 The green body after direct thermal degreasing had a flexural modulus of 4167 MPa and a dimensional change rate of 1.42%.
The raw materials used in this example 6 were as follows: 264.885g (93.74%) of stainless steel powder with hydroxyl groups on the surface, 10.944g (3.87%) of a backbone polymer glycidyl methacrylate grafted High Density Polyethylene (HDPE)gGMA), 6.731g (2.38%) microcrystalline wax.
Referring to fig. 1, a method for preparing an injection molded feed of surface treated stainless steel powder with a functionalized binder is as follows:
(1) Preparation of stainless Steel powder with hydroxyl groups on the surface
(1.1) weighing 100g of stainless steel powder in parts by mass, and pouring the stainless steel powder into a high-speed mixer;
(1.2) weighing 0.3g of hydroxyl-terminated hyperbranched polyester and 0.4g of acetone, pouring the materials into a beaker, and stirring and dissolving to obtain a hydroxyl-terminated hyperbranched polyester modifier;
(1.3) dripping the modifier onto the surface of the stainless steel powder in the mixer when the temperature of the stainless steel powder in the high-speed mixer reaches 130 ℃, mixing at 850rpm for 45min, and taking out the stainless steel powder after surface treatment;
(1.4) washing the stainless steel powder with acetone for a plurality of times, and drying the stainless steel powder in a forced air drying oven at 85 ℃ for 4 hours to obtain the stainless steel powder with hydroxyl groups on the surface.
(2) Preparation of stainless Steel Metal powder injection Molding feed
264.885g of stainless steel powder with hydroxyl groups on the surface, 10.944g of skeleton polymer and 6.731g of microcrystalline wax are weighed and added into a banburying chamber, and mixed for 30min at the rotation speed of 60rpm and the temperature of 150 ℃ to obtain injection molding feed composed of the stainless steel metal powder with carboxyl groups on the surface and the functionalized binder. As can be seen from fig. 2 (b), the hydroxyl groups on the stainless steel powder surface chemically react with the epoxy groups on the adhesive surface to form chemical bond linkages.
The injection molded feed prepared in this example 6 had a powder volume loading of 62.7 vol% and a green density of 5.04 g/cm 3 The green body after direct thermal degreasing had a flexural modulus of 4251 MPa and a dimensional change rate of 1.39%.
The raw materials used in this comparative example 1 are as follows: 256.932g (93.09%) unmodified stainless steel powder 11.815g (4.28%) backbone polymer glycidyl methacrylate grafted High Density Polyethylene (HDPE)gGMA), 7.267g (2.63%) microcrystalline wax.
The rotational speed is set to be 60rpm, and the mixture is mixed for 30 minutes at 150 ℃ to obtain the injection molding feed composed of unmodified stainless steel powder and a binder.
The injection molded feed prepared in this comparative example 1 had a powder volume loading of 61 vol% and a green density of 4.79 g/cm 3 The flexural modulus was 3597 MPa and the dimensional change rate of the green body after direct thermal degreasing was 1.64%.
The raw materials used in this comparative example 2 were as follows: 261.144 (93.35%) unmodified stainless Steel powder 11.512g (4.12%) backbone Polymer glycidyl methacrylate grafted high Density polyethylene (HDPE-gGMA), 7.08g (2.53%) microcrystalline wax.
The rotational speed is set to be 60rpm, and the mixture is mixed for 30 minutes at 150 ℃ to obtain the injection molding feed composed of unmodified stainless steel powder and a binder.
Comparative example2 the powder volume loading of the injection molded feed prepared was 62 vol% and the green density was 4.81g/cm 3 The flexural modulus was 3612 MPa and the dimensional change rate of the green body after direct thermal degreasing was 1.61%.
The raw materials used in this comparative example 3 were as follows: 265.356 (93.61%) unmodified stainless Steel powder 11.209g (3.95%) Polymer glycidyl methacrylate grafted High Density Polyethylene (HDPE)gGMA), 6.894g (2.43%) microcrystalline wax.
The rotational speed is set to be 60rpm, and the mixture is mixed for 30 minutes at 150 ℃ to obtain the injection molding feed composed of unmodified stainless steel powder and a binder.
The injection molded feed prepared in this comparative example 3 had a powder volume loading of 63 vol% and a green density of 4.94g/cm 3 The flexural modulus was 3634 MPa and the dimensional change rate of the green body after direct thermal degreasing was 1.53%.
Examples 1-6 show the green density, flexural modulus and green dimensional change rate of injection molded feeds composed of carboxyl-terminated hyperbranched polyesters or hydroxyl-terminated hyperbranched polyesters with different volume loadings of surface-modified stainless steel metal powder and a binder after thermal degreasing. In examples 1 to 3, the volume loading of the injection molded feed composed of the stainless steel metal powder surface-modified with the carboxyl-terminated hyperbranched polyester and the binder was increased from 61 to 63.5vol%, and the feed density was increased from 5.07 to g/cm 3 Increased to 5.16g/cm 3 The flexural modulus is increased from 4394 MPa to 4467 MPa, and the dimensional change rate of the green body after thermal degreasing is reduced from 0.74% to 0.5%. In examples 4 to 6, the volume loading of the injection molded feed composed of the stainless steel metal powder surface-modified with the hydroxyl-terminated hyperbranched polyester and the binder was increased from 61 to 62.7 vol%, and the feed density was increased from 4.97g/cm 3 Increased to 5.04 g/cm 3 The flexural modulus is increased from 4133 MPa to 4251 MPa, and the dimensional change rate of the green body after thermal degreasing is reduced from 1.48% to 1.39%.
Injection molded feedstock composed of non-surface modified stainless steel metal powder with varying volume loadings and binder, as seen in comparative examples 1-3, for green density, flexural modulus and green dimensional change after thermal degreasingThe rate. The volume loading of the injection molding feed consisting of stainless steel metal powder and binder which is not subjected to surface modification treatment is increased from 61 vol% to 63 vol%, and the feed density is 4.79 g/cm 3 Increased to 4.94g/cm 3 The flexural modulus is increased from 3597 MPa to 3634 MPa, and the dimensional change rate of the green body after thermal degreasing is reduced from 1.64% to 1.53%.
In summary, the surface modified stainless steel metal powder of the carboxyl-terminated hyperbranched polyester and the hydroxyl-terminated hyperbranched polyester with the same volume loading capacity is respectively injection molded with the binder, and compared with the injection molded feed formed by the stainless steel metal powder which is not subjected to the surface modification treatment and the binder, the surface modified stainless steel metal powder has the advantages of improving the feeding density, the bending modulus of the green body and the like to a certain extent, and reducing the degreasing size change rate of the green body to a certain extent. The critical volume loading capacity of the injection molding feed composed of the stainless steel metal powder subjected to the surface modification treatment of the carboxyl-terminated hyperbranched polyester and the binder can be up to 63.5vol%, and the feed density is up to 5.16g/cm 3 The bending modulus is as high as 4467 MPa, the dimensional change rate of the green body after thermal degreasing can be reduced to 0.5%, and the shape retention performance of the green body is improved.
Claims (1)
1. A method for preparing an injection molded feed comprising surface treated stainless steel powder and a functionalized binder, characterized by the steps of:
(1) Preparation of stainless Steel powder with carboxyl groups on the surface
(1.1) 100 parts of stainless steel powder was poured into a high-speed mixer;
(1.2) adding 0.3 part of carboxyl-terminated hyperbranched polyester and 0.4 part of acetone into a beaker, stirring and dissolving to obtain a carboxyl-terminated hyperbranched polyester modifier;
(1.3) adding 0.3 part of hydroxyl-terminated hyperbranched polyester and 0.4 part of acetone into a beaker, stirring and dissolving to obtain a hydroxyl-terminated hyperbranched polyester modifier;
(1.4) dropwise adding a modifier when the temperature of the stainless steel powder in the high-speed mixer reaches 130-140 ℃, wherein the modifier is a carboxyl-terminated hyperbranched polyester modifier or a hydroxyl-terminated hyperbranched polyester modifier; mixing for 40-60min at 850rpm to obtain surface-treated stainless steel powder;
the carboxyl-terminated hyperbranched polyester modifier is prepared by dissolving 0.3 part of carboxyl-terminated hyperbranched polyester in 0.4 part of acetone;
the hydroxyl-terminated hyperbranched polyester modifier is prepared by dissolving 0.3 part of hydroxyl-terminated hyperbranched polyester in 0.4 part of acetone;
(1.5) washing the stainless steel powder subjected to surface treatment by using acetone for multiple times, and drying in a forced air drying oven at the temperature of 85 ℃ for 4-6 hours to obtain stainless steel powder with carboxyl groups or hydroxyl groups on the surface;
(2) Preparation of injection molded feeds
Adding 93.2-93.9 weight percent of stainless steel powder with carboxyl or hydroxyl on the surface, 3.8-4.2 weight percent of skeleton polymer and 2.3-2.6 weight percent of microcrystalline wax into a banburying chamber, and mixing for 15-30min at the rotating speed of 50-100rpm and the temperature of 140-160 ℃ to obtain injection molding feed of the surface treated stainless steel metal powder and the functionalized binder;
the powder volume loading of the injection molding feed of the surface-treated stainless steel metal powder and the functionalized binder is 60.5-63.5 vol%; the green density is 5.02-5.16 g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The flexural modulus is 4100-4500 Mpa, and the dimensional change rate of the green body after degreasing is 0.5-1.5%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210218550.5A CN114559042B (en) | 2022-03-08 | 2022-03-08 | Preparation method of injection molding feed containing surface-treated stainless steel powder and functionalized binder |
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| CN202210218550.5A CN114559042B (en) | 2022-03-08 | 2022-03-08 | Preparation method of injection molding feed containing surface-treated stainless steel powder and functionalized binder |
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| CN114559042A CN114559042A (en) | 2022-05-31 |
| CN114559042B true CN114559042B (en) | 2023-07-21 |
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