CN113547118B - Metal powder feeding mixing method for increasing capacity of binder - Google Patents
Metal powder feeding mixing method for increasing capacity of binder Download PDFInfo
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- CN113547118B CN113547118B CN202110810779.3A CN202110810779A CN113547118B CN 113547118 B CN113547118 B CN 113547118B CN 202110810779 A CN202110810779 A CN 202110810779A CN 113547118 B CN113547118 B CN 113547118B
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- 239000000843 powder Substances 0.000 title claims abstract description 136
- 239000011230 binding agent Substances 0.000 title claims abstract description 123
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 51
- 239000002184 metal Substances 0.000 title claims abstract description 51
- 238000002156 mixing Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000003756 stirring Methods 0.000 claims abstract description 38
- 238000010438 heat treatment Methods 0.000 claims abstract description 31
- 239000000463 material Substances 0.000 claims abstract description 12
- 239000002904 solvent Substances 0.000 claims abstract description 10
- -1 polyethylene Polymers 0.000 claims description 25
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 claims description 24
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 11
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 10
- 239000004743 Polypropylene Substances 0.000 claims description 9
- 229920001155 polypropylene Polymers 0.000 claims description 9
- 239000001993 wax Substances 0.000 claims description 9
- 235000021355 Stearic acid Nutrition 0.000 claims description 8
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 8
- 239000012188 paraffin wax Substances 0.000 claims description 8
- 239000003208 petroleum Substances 0.000 claims description 8
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 8
- 229920006324 polyoxymethylene Polymers 0.000 claims description 8
- 239000008117 stearic acid Substances 0.000 claims description 8
- 239000004698 Polyethylene Substances 0.000 claims description 7
- 229920001971 elastomer Polymers 0.000 claims description 7
- 229920000573 polyethylene Polymers 0.000 claims description 7
- 239000005060 rubber Substances 0.000 claims description 7
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 claims description 6
- 238000009835 boiling Methods 0.000 claims description 4
- AMQJEAYHLZJPGS-UHFFFAOYSA-N N-Pentanol Chemical compound CCCCCO AMQJEAYHLZJPGS-UHFFFAOYSA-N 0.000 claims description 3
- 239000004203 carnauba wax Substances 0.000 claims description 3
- ZJOLCKGSXLIVAA-UHFFFAOYSA-N ethene;octadecanamide Chemical compound C=C.CCCCCCCCCCCCCCCCCC(N)=O.CCCCCCCCCCCCCCCCCC(N)=O ZJOLCKGSXLIVAA-UHFFFAOYSA-N 0.000 claims description 3
- 239000004200 microcrystalline wax Substances 0.000 claims description 3
- 235000019808 microcrystalline wax Nutrition 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 239000004519 grease Substances 0.000 claims 2
- 229920003244 diene elastomer Polymers 0.000 claims 1
- 239000003925 fat Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 19
- 239000000853 adhesive Substances 0.000 abstract description 13
- 230000001070 adhesive effect Effects 0.000 abstract description 13
- 238000001704 evaporation Methods 0.000 abstract description 2
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 description 38
- 238000000576 coating method Methods 0.000 description 38
- 230000000052 comparative effect Effects 0.000 description 17
- 239000002245 particle Substances 0.000 description 12
- 229910001069 Ti alloy Inorganic materials 0.000 description 11
- 239000000203 mixture Substances 0.000 description 11
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 9
- 239000010936 titanium Substances 0.000 description 9
- 229910052719 titanium Inorganic materials 0.000 description 9
- 239000012298 atmosphere Substances 0.000 description 8
- 229930040373 Paraformaldehyde Natural products 0.000 description 7
- 239000005062 Polybutadiene Substances 0.000 description 5
- 239000007767 bonding agent Substances 0.000 description 5
- 238000005238 degreasing Methods 0.000 description 5
- 229920002857 polybutadiene Polymers 0.000 description 5
- 238000005245 sintering Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 229910000531 Co alloy Inorganic materials 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 2
- 229910000640 Fe alloy Inorganic materials 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000990 Ni alloy Inorganic materials 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910001080 W alloy Inorganic materials 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
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
- 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
Abstract
The method for mixing the metal powder feed with the compatibilized binder comprises the steps of S1, dissolving a low molecular weight binder in the compatibilizing agent, heating and stirring until the low molecular weight binder is completely dissolved; s2, adding metal powder, continuing heating and stirring until stirring is mud, and continuing stirring for 30 minutes; s3, pouring the mud into a mixing roll, heating and mixing, then adding a binder with medium molecular weight and high molecular weight, heating and mixing, and evaporating the compatibilizer until all materials form a dough shape. The invention uses the compatibilizer to dissolve and dilute the binder, helps the binder to be uniformly adhered on the surface of each powder, coats the powder by the binder with medium molecular weight and high molecular weight, and finally evaporates and removes the solubilizer in the mixing process to obtain the feed with correct proportion, and the feed is manufactured into clusters and granulated. The method is simple and convenient, the adhesive on the outer surface of the metal powder is completely coated, and the dispersing effect is good, so that the powder fluidity is improved.
Description
Technical Field
The invention relates to the technical field of surface treatment of metal powder, in particular to a metal powder feeding mixing method for increasing the capacity of a binder.
Background
Powder forming technology is the basic process for many ceramic and metal parts. The inorganic powder mixing binder is made into a main process of feeding and metal injection molding, but when the granularity of the inorganic powder is reduced, the relative specific surface area is increased, and under the same volume or weight state, the more the particle number of the powder is, the finer the particles are, and the total surface area of the powder is increased by a square multiple along with the increase of the particle number. As shown in fig. 1, assuming that the powder is stainless steel 316L and spherical, the amount of powder of 1 gram of powder at different particle diameter values can be calculated, and the calculation in the figure is performed by converting the volume and density into weight, and the smaller the diameter of each gram of powder, the larger the amount of powder particles is represented by the total number of powder particles. Of course, the total surface area of the powder is also different. This is most common physically, the finer the powder particles, the higher the surface area/weight.
Since the particle size of the titanium metal powder is mostly smaller than 60 μm and even finer, and the particles of the binder are very large (block paraffin, coarse stearic acid powder, various plastic particles), the conventional mixing process must first stir and heat the titanium metal powder and then melt the titanium metal powder after the binder is thrown in, which is not easy to be uniform but dangerous, the active and easily oxidized characteristics of the titanium metal are well known, especially the friction of fine powder particles in the air and during the mixing process, and the titanium metal powder is rubbed with each other for a while when the binder has not melted the coating powder, so that the titanium metal powder is oxidized very easily and even burns, and the operation is very dangerous and difficult. Then, the adhesive with fixed volume is required to be uniformly coated on the surface of each powder, and the adhesive with high molecular weight is required to be heated until the adhesive is completely melted, so that the coating effect is achieved, but the low-molecular adhesive with lower temperature is easy to evaporate and vaporize, and is quite difficult to control.
In addition, generally, the volume ratio of the powder to the binder is designed in advance before mixing, and reasonable values are formed by the binder: the powder is 30:70 to 55:45 but 37:63 has been difficult to handle in many years of manufacturing and research experience, it is well known that when the proportion of powder is higher, the shrinkage of the product after curing is smaller and the chance of deformation is smaller after completing injection of the blank to subsequent degreasing and sintering, and many people have therefore tried to feed towards higher volume ratios of powder, but most have ended with failure. The main problems are mostly that the dispersion effect of the binder is poor, and the binder cannot effectively wrap the powder, so that the feeding is difficult to inject into a mould in the injection molding process, and even the gun barrel is blocked.
Disclosure of Invention
In view of the shortcomings of the prior art, the invention aims to provide a metal powder feeding mixing method for increasing the volume of a binder, which is characterized in that the volume of the binder is increased, but the volume of the binder is not increased, and the binder is dissolved and diluted by the compatibilizer, so that the binder can be uniformly adhered to the surface of each powder. And finally evaporating and removing the solubilizer in the mixing process to obtain the feed with the correct proportion, and making the feed into clusters and granulating. The method is simple and convenient, the coating of the adhesive on the outer surface of the metal powder is complete, the adhesive dispersing effect is good, the powder fluidity is improved, and the potential safety hazard caused by friction due to incomplete coating is avoided.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the metal powder feeding and mixing method for compatibilizing adhesive includes the steps of adding metal powder into adhesive, mixing to make the adhesive coat the outer surface of the metal powder, and the steps of:
s1, dissolving a low molecular weight binder in a compatibilizer, heating and stirring at a heating temperature of 45-60 ℃ until the low molecular weight binder is completely dissolved;
s2, adding metal powder, continuously heating and stirring, wherein the heating temperature is 45-60 ℃, and continuously stirring for 30 minutes after stirring to form a mud;
s3, pouring the mud into a mixing mill, heating and mixing, and starting to pressurize from 101Kpa to 505-1010 Kpa by using a pressing hammer; when the temperature is raised to 120 ℃, the binder with medium molecular weight and high molecular weight is added, heated and mixed, and the compatibilizer is evaporated until all the materials form a dough shape.
Preferably, the total volume ratio of the binder to the total volume of the metal powder and the compatibilizer is 30:70:60-300-55:45:110-550, wherein the compatibilizer is 2-10 times of the total volume of the binder, and the low molecular weight binder accounts for 2-10% of the total volume of the binder.
Preferably, the compatibilizer is one or more of n-heptane, no. 70, no. 90 and No. 120 petroleum-based solvent, and the highest boiling point is not more than 120 ℃.
Preferably, the low molecular weight binder is one or more of stearic acid, zinc stearate, quaternary tetra amyl alcohol stearate, ethylene bis stearic acid amide, paraffin wax, microcrystalline wax, brazil wax, fischer-Tropsch wax and polyethylene wax.
Preferably, the medium molecular weight binder is one or more of butadiene rubber and rubber.
Preferably, the high molecular weight binder is one or more of polyoxymethylene, ethylene-vinyl acetate copolymer, polypropylene and polyethylene.
Preferably, the metal of the metal powder includes titanium, titanium alloy, iron alloy, copper alloy, nickel alloy, cobalt alloy, and tungsten alloy.
Compared with the prior art, the invention has the following beneficial effects:
1. the low-molecular-weight binder is dissolved and diluted by the compatibilizer, a thin layer of binder can be coated on the outer surface of the metal powder, and then the second coating is carried out by the binder with medium molecular weight and high molecular weight, so that the problems of incomplete coating, non-uniformity, oxidation and even combustion caused by friction among the metal powder when the binder with high molecular weight is directly coated can be avoided, and the compatibilizer is beneficial to dissolving the binder, so that the binder of the final powder is completely coated, has good dispersibility and good fluidity;
2. because the low molecular weight binder is easily gasified by heating, a pore structure is easily formed when degreasing is performed in the subsequent process, resulting in distortion and brittleness of the product. The proportion of the low molecular weight binder is controlled to be 2-10%, so that the porous structure of the product is less, the product is not easy to distort and break when the metal powder is subjected to degreasing treatment;
3. the high molecular weight binder is used as a high-temperature framework to play a role in shape retention, so that the powder can be supported to maintain the shape before being sintered, and the products formed by subsequent sintering maintain relative geometric relationship;
4. the low molecular weight binder and the high molecular weight binder can be connected by adding the medium molecular weight binder, so that the gap between the low molecular weight binder and the high molecular weight binder is filled;
5. the highest boiling range temperature point of the compatibilizer is not more than 120 ℃, so that the compatibilizer can be conveniently gasified.
Drawings
FIG. 1 is a graph showing data of total number of particles and surface area per gram of powder, which are different from each other in diameter;
FIG. 2 is a comparative enlarged view of the powder of example 1 without coating and with coating;
FIG. 3 is an enlarged view of the powder coating of comparative example 1;
FIG. 4 is a schematic diagram of a titanium metal sludge treatment sequence;
FIG. 5 is a schematic drawing showing kneading by a kneader.
Detailed Description
The invention is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
As shown in fig. 4 and 5, the present invention provides the following technical solutions:
the metal powder feeding and mixing method for compatibilizing adhesive includes the steps of adding metal powder into adhesive, mixing to make the adhesive coat the outer surface of the metal powder, and the steps of:
s1, dissolving a low molecular weight binder in a compatibilizer, heating and stirring at a heating temperature of 45-60 ℃ until the low molecular weight binder is completely dissolved;
s2, adding metal powder, continuously heating and stirring, wherein the heating temperature is 45-60 ℃, and continuously stirring for 30 minutes after stirring to form a mud;
s3, pouring the mud into a mixing mill, heating and mixing, and starting to pressurize from 101Kpa to 505-1010 Kpa by using a pressing hammer; when the temperature is raised to 120 ℃, the binder with medium molecular weight and high molecular weight is added, heated and mixed, and the compatibilizer is evaporated until all the materials form a dough shape.
Preferably, the total volume ratio of the binder to the total volume of the metal powder and the compatibilizer is 30:70:60-300-55:45:110-550. The volume of the compatibilizer is 2-10 times of the total volume of the binder, so that the compatibilizer is more beneficial to the dissolution of the binder and can be uniformly coated on the surface of the powder. The low molecular weight binder accounts for 2-10% of the total volume of the binder. Because the low molecular weight binder is easily gasified by heating, a pore structure is easily formed when degreasing is performed in the subsequent process, resulting in distortion and brittleness of the product. The proportion of the low molecular weight binder is controlled to be 2-10%, so that the porous structure of the product is less, the product is not easy to distort and break during degreasing treatment of the metal powder. Wherein, the volume ratio of the total volume of the binder to the volume of the metal powder can control the shrinkage of the cured product to be smaller and the deformation opportunity to be smaller after the powder is subjected to overmoulding.
Preferably, the compatibilizer is one or more of n-heptane, no. 70, no. 90 and No. 120 petroleum-based solvent, and the highest temperature point of the boiling range is not more than 120 ℃, so that the compatibilizer can be conveniently gasified during mixing.
Preferably, the low molecular weight binder is one or more of stearic acid, zinc stearate, quaternary tetra amyl alcohol stearate, ethylene bis stearic acid amide, paraffin wax, microcrystalline wax, brazil wax, fischer-Tropsch wax and polyethylene wax.
Preferably, the medium molecular weight binder is one or more of butadiene rubber and rubber. The bonding agent can be connected between the low molecular weight bonding agent and the high molecular weight bonding agent, and fills in the gap between the low molecular weight bonding agent and the high molecular weight bonding agent.
Preferably, the high molecular weight binder is one or more of polyoxymethylene, ethylene-vinyl acetate copolymer, polypropylene and polyethylene. As a high temperature skeleton, it acts as a conformal, even though the powder can be supported to maintain its shape prior to sintering, the product formed in the subsequent sintering maintains a relative geometry.
Preferably, the metal of the metal powder includes titanium, titanium alloy, iron alloy, copper alloy, nickel alloy, cobalt alloy, and tungsten alloy. Pure elements such as iron, copper, nickel, cobalt, tungsten and the like are typical metals which are not easy to mix after being micronized, and the mixing homogenization is facilitated by a compatibilizer method.
According to the invention, the low-molecular-weight binder is dissolved and diluted by the compatibilizer, so that a thin layer of binder can be coated on the outer surface of the metal powder, and then the second coating is carried out by the binder with medium molecular weight and high molecular weight, thereby avoiding the problems of oxidation and even combustion caused by friction between the metal powder when the binder with high molecular weight is directly coated. Because the compatibilizer is contained, the dissolution of the binder is facilitated, and the problems of incomplete and uneven wrapping can be avoided. And because the compatibilizer is favorable for dissolving the binder, the binder of the final powder is completely coated, and the dispersibility is good, so that the obtained powder has good fluidity.
The following describes the invention in more detail with reference to examples, which are not intended to limit the invention thereto.
Example 1 (low molecular weight 10%, compatibilizer/binder: 2 times, titanium alloy powder, binder/powder=1)
Firstly, 10g of low molecular weight binder (5 g of stearic acid and 5g of paraffin wax) is placed into 108g of compatibilizer (n-heptane), and the mixture is heated and stirred at the temperature of 45-60 ℃ until the mixture is completely dissolved. And adding 360g of titanium alloy powder, continuously heating and stirring at the temperature of 45-60 ℃ until stirring is mud, and continuously stirring for 30 minutes. The paste was then poured into a mixer and heated to mix, the pressure was 1 atmosphere (101 Kpa) and increased to 10 atmospheres (1010 Kpa), 30g of medium molecular weight (butadiene rubber) and 60g of high molecular weight binder (10 g of ethylene-vinyl acetate copolymer +20g of polypropylene +30g of polyoxymethylene) were added at 120 c, heated to mix, and the compatibilizer was evaporated until all the materials formed into a dough shape. The fluidity of the obtained powder is 400-550 g/10min, the coating effect is as shown in figure 2, and the powder coating is complete and uniform. The specific parameters are shown in Table 1 below:
table 1 example 1 component parameter table
Example 2 (low molecular weight 2%, compatibilizer/binder: 2 times, titanium alloy powder, binder/powder=1)
Firstly, 2g of low molecular weight binder (1 g of stearic acid and 1g of paraffin wax) is placed into 103.7g of compatibilizer (n-heptane), and the mixture is heated and stirred at the temperature of 45-60 ℃ until the mixture is completely dissolved. Adding 343.4g of titanium alloy powder, continuously heating and stirring at 45-60 ℃ until stirring is mud, and continuously stirring for 30 minutes. The paste was then poured into a mixer and heated to mix, the pressure was 1 atmosphere (101 Kpa) and increased to 10 atmospheres (1010 Kpa), 5g of medium molecular weight (rubber) and 93g of high molecular weight binder (5 g of ethylene-vinyl acetate copolymer +3g of polyethylene +85g of polyoxymethylene) were added when the temperature was raised to 120 c, heated to mix, and the compatibilizer was evaporated until all the materials formed into a dough shape. The fluidity of the obtained powder is 425-580 g/10min, the coating effect is consistent with that of the powder shown in figure 2, and the powder coating is complete and uniform. Parameters are as follows in table 2:
table 2 example 2 component parameter table
Example 3 (low molecular weight 5%, compatibilizer/binder: 10 times, titanium alloy powder, binder/powder=0.67)
Firstly, 5g of low molecular weight binder (3 g of stearic acid and 2g of paraffin wax) is placed into 522.9g of compatibilizer (n-heptane), and the mixture is heated and stirred at the temperature of 45-60 ℃ until the mixture is completely dissolved. 519.1g of titanium alloy powder is added, heating and stirring are continued until stirring is carried out for 30 minutes at the temperature of 45-60 ℃ until stirring is carried out to form mud. The paste was then poured into a mixer and heated to mix, the pressure was 1 atmosphere (101 Kpa) and increased to 10 atmospheres (1010 Kpa), 5g of medium molecular weight (butadiene rubber) and 90g of high molecular weight binder (5 g of ethylene-vinyl acetate copolymer +5g of polypropylene +80g of polyoxymethylene) were added at 120 c, heated to mix, and the compatibilizer was evaporated until all the materials formed into a dough shape. The fluidity of the obtained powder is 320-500 g/10min, the coating effect is consistent with that of fig. 2, and the powder coating is complete and uniform. The specific parameters are shown in Table 3 below:
TABLE 3 example 3 component parameter tables
Example 4 (low molecular weight 8%, compatibilizer/binder: 5 times, titanium alloy powder, binder/powder=0.85)
Firstly, 8g of low molecular weight binder (4 g of zinc stearate plus 4g of Fischer-Tropsch wax) is taken and placed into 312.4g of compatibilizer (90 # petroleum base solvent), and heating and stirring are carried out until the mixture is completely dissolved at the temperature of 45-60 ℃. Adding 412.6g of titanium alloy powder, continuously heating and stirring at 45-60 ℃ until stirring is mud, and continuously stirring for 30 minutes. The paste was then poured into a mixer and heated to mix, the pressure was 1 atmosphere (101 Kpa) and increased to 10 atmospheres (1010 Kpa), 5g of medium molecular weight binder (rubber) and 87g of high molecular weight binder (3 g of ethylene-vinyl acetate copolymer +3g of polypropylene +81g of polyoxymethylene) were added at 120 c, heated to mix, and the compatibilizer was evaporated until all the materials formed into a dough. The fluidity of the obtained powder is 300-420 g/10min, the coating effect is consistent with that of the powder shown in figure 2, and the powder coating is complete and uniform. The specific parameters are shown in Table 4 below:
TABLE 4 example 4 component parameter tables
Example 5 (low molecular weight 6%, compatibilizer/binder: 6 times, stainless steel powder 316L, binder/powder=0.59)
Firstly, 6g of low molecular weight binder (3 g of zinc stearate and 3g of Fischer-Tropsch wax) is placed into 369.1g of compatibilizer (80 # petroleum base solvent), and heating and stirring are carried out until the mixture is completely dissolved at the temperature of 45-60 ℃. 1034.4g 316L stainless steel powder is added, heating and stirring are continued until stirring is carried out for 30 minutes at the temperature of 45-60 ℃ until stirring is carried out to form mud. The paste was then poured into a mixer and heated to mix, the pressure was 1 atmosphere (101 Kpa) and increased to 10 atmospheres (1010 Kpa), 5g of medium molecular weight binder (rubber) and 89g of high molecular weight binder (1 g of ethylene-vinyl acetate copolymer +3g of polypropylene +85g of polyoxymethylene) were added at 120 c, heated to mix, and the compatibilizer was evaporated until all the materials formed into a dough. The fluidity of the obtained powder is 1250-1500 g/10min, the coating effect is consistent with that of FIG. 2, and the powder coating is complete and uniform. The specific parameters are shown in Table 5 below:
TABLE 5 example 5 component parameter tables
Example 6 (low molecular weight 6%, compatibilizer/binder: 10 times, pure copper powder, binder/powder=0.81)
Firstly, 6g of low molecular weight binder (3 g of zinc stearate plus 3g of Fischer-Tropsch wax) is taken and placed into 615g of compatibilizer (80 # petroleum base solvent), and heating and stirring are carried out until the mixture is completely dissolved at the temperature of 45-60 ℃. Adding 836.6g of pure copper powder, continuously heating and stirring at 45-60 ℃ until stirring is mud, and continuously stirring for 30 minutes. The paste was then poured into a mixer and heated to mix, the pressure was 1 atmosphere (101 Kpa) and increased to 10 atmospheres (1010 Kpa), 5g of medium molecular weight binder (rubber) and 89g of high molecular weight binder (1 g of ethylene-vinyl acetate copolymer +3g of polypropylene +85g of polyoxymethylene) were added at 120 c, heated to mix, and the compatibilizer was evaporated until all the materials formed into a dough. The fluidity of the obtained powder is 690-880 g/10min, the coating effect is consistent with that of FIG. 2, and the powder coating is complete and uniform. The specific parameters are shown in Table 6 below:
TABLE 6 example 6 component parameter Table
Comparative example 1
360g of titanium alloy powder is firstly mixed with 10g of low molecular weight binder (5 g of stearic acid and 5g of paraffin), 30g of medium molecular weight (butadiene rubber) and 60g of high molecular weight binder (10 g of ethylene-vinyl acetate copolymer and 20g of polypropylene and 30g of polyoxymethylene), and the mixture is poured into a mixer for heating and mixing, the temperature is 120 ℃, the pressure is 1 atmosphere (101 Kpa) and the pressure is increased until the pressure reaches 10 atmosphere (1010 KPa), and the compatibilizer is evaporated until all materials form a dough shape. The fluidity of the obtained powder is 380-530 g/10min, the coating effect is as shown in figure 3, and the powder coating can cause the phenomenon of skin breaking due to the lack of a low molecular weight binder.
Comparative example 2
The difference compared to comparative example 1 is that the components of the binder and the powder are the same as the grammage, all others. The components of the binder and the metal powder are the same in gram weight as in example 2. The fluidity of the obtained powder is 340-510 g/10min, the coating effect is consistent with that shown in figure 3, and the powder coating can cause the phenomenon of skin breaking due to the lack of a low molecular weight binder.
Comparative example 3
The difference compared to comparative example 1 is that the components of the binder and the powder are the same as the grammage, all others. The components of the binder and the metal powder are the same in gram weight as in example 3. The fluidity of the obtained powder is 280-430 g/10min, the coating effect is consistent with that of the powder shown in figure 3, and the powder coating can be broken due to the lack of a low molecular weight binder.
Comparative example 4
The difference compared to comparative example 1 is that the components of the binder and the powder are the same as the grammage, all others. The components of the binder and the metal powder are the same in gram weight as in example 4. The fluidity of the obtained powder is 210-400 g/10min, the coating effect is consistent with that of the powder shown in figure 3, and the powder coating can be broken due to the lack of a low molecular weight binder.
Comparative example 5
The difference compared to comparative example 1 is that the components of the binder and the powder are the same as the grammage, all others. The components of the binder and the metal powder are the same in gram weight as in example 5. The fluidity of the obtained powder is 830-1120 g/10min, the coating effect is consistent with that of the powder shown in figure 3, and the powder coating can be broken due to the lack of a low molecular weight binder.
Comparative example 6
The difference compared to comparative example 1 is that the components of the binder and the powder are the same as the grammage, all others. The components of the binder and the metal powder are the same in gram weight as in example 6. The fluidity of the obtained powder is 560-730 g/10min, the coating effect is consistent with that of the powder shown in figure 3, and the powder coating can cause the phenomenon of skin breaking due to the lack of a low molecular weight binder.
The powder products obtained according to examples 1 to 6 and comparative examples 1 to 6 were tested for flowability data versus Table 7.
TABLE 7 comparison of flowability data for examples 1-6 and comparative examples 1-6
In summary, examples 1-6 showed better flowability of the powder than comparative examples 1-6, indicating good dispersibility and complete and uniform coating. According to fig. 2 (coating effect graph of the present invention) and fig. 3 (coating effect graph of comparative example), coating of the powder was complete and uniform with respect to the original formulation, and no skin breakage occurred.
It should be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (2)
1. The metal powder feeding and mixing method for increasing the capacity of the binder is characterized by adding the metal powder into the binder, uniformly mixing the metal powder and the binder to coat the outer surface of the metal powder, and comprising the following steps of:
s1, firstly, binding a low molecular weight binder: one or more of stearic acid, zinc stearate, quaternary tetra amyl alcohol stearate, ethylene bis stearic acid amide, paraffin wax, microcrystalline wax, brazil wax, fischer-Tropsch wax and polyethylene wax are mixed for use and dissolved in a compatibilizer: heating and stirring one or more of n-heptane, no. 70, no. 90 and No. 120 petroleum-based solvent grease until all the materials are dissolved, wherein the heating temperature is 45-60 ℃;
s2, adding metal powder, continuously heating and stirring, wherein the heating temperature is 45-60 ℃, and continuously stirring for 30 minutes after stirring to form a mud;
s3, pouring the mud into a mixing mill, heating and mixing, and starting to pressurize from 101Kpa to 505-1010 Kpa by using a pressing hammer; the medium molecular weight binder was added when the temperature was raised to 120 ℃: diene rubber, a rubber, and a high molecular weight binder: one or more of polyformaldehyde, ethylene-vinyl acetate copolymer, polypropylene and polyethylene are mixed for use, heated and mixed, and the compatibilizer is evaporated: one or more of n-heptane, no. 70, no. 90 and No. 120 petroleum-based solvent grease are mixed until all materials form a dough shape; the total volume ratio of the binder to the total volume of the metal powder and the compatibilizer is 30:70:60-300-55:45:110-550, the compatibilizer is 2-10 times of the total volume of the binder, and the low molecular weight binder accounts for 2-10% of the total volume of the binder.
2. The method of claim 1, wherein the compatibilizer is one or more of n-heptane, no. 70, no. 90, no. 120 petroleum-based solvent fats, and the highest boiling point is not more than 120 ℃.
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Denomination of invention: A Method for Mixing Metal Powder Feed with Adhesive Compatibilization Granted publication date: 20230801 Pledgee: Bank of Nanjing Co.,Ltd. Taizhou Branch Pledgor: Jiangsu Jinwu New Material Co.,Ltd. Registration number: Y2024980004626 |
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