CN113976890B - Adhesive, preparation method thereof and application of adhesive in metal powder injection molding - Google Patents
Adhesive, preparation method thereof and application of adhesive in metal powder injection molding Download PDFInfo
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- CN113976890B CN113976890B CN202111221437.4A CN202111221437A CN113976890B CN 113976890 B CN113976890 B CN 113976890B CN 202111221437 A CN202111221437 A CN 202111221437A CN 113976890 B CN113976890 B CN 113976890B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
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- 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
- B22F3/10—Sintering only
- B22F3/1017—Multiple heating or additional steps
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1017—Multiple heating or additional steps
- B22F3/1021—Removal of binder or filler
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/227—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
Abstract
The invention provides an adhesive, a preparation method thereof and application thereof in metal powder injection molding, and relates to the technical field of metal powder injection molding. The adhesive comprises the following components: the polyethylene glycol/polylactic acid composite material comprises a polyethylene glycol mixture, polyformaldehyde, polylactic acid resin, polymethyl methacrylate, dimethylacetamide, sodium alkyl diphenyl ether disulfonate, an antioxidant, a plasticizer and a surfactant, wherein the mass ratio of polyethylene glycol 1000 to polyethylene glycol 1500 in the polyethylene glycol mixture is (2-4): 7. in the preparation method of the adhesive, an ultrasonic composite stirring mode is adopted for mixing. The adhesive is prepared by adding dimethylacetamide and alkyl diphenyl ether disulfonic acid sodium into raw materials, so that the mechanical property and shape retention of the formed metal part are effectively improved. The adhesive adopts an ultrasonic composite stirring mode in the preparation process, so that the mixing effect is enhanced, the internal stress of the material is enhanced, and the mechanical property and the shape retention of the formed metal part are improved.
Description
Technical Field
The invention relates to the technical field of metal powder injection molding, and particularly relates to a bonding agent, a preparation method thereof and application thereof in metal powder injection molding.
Background
Metal injection molding is a new powder metallurgy near-net-shape molding technology that has been introduced from the plastic injection molding industry. In recent years, this technology has been rapidly developed, and a metal part having a high density and a complicated three-dimensional structure can be rapidly manufactured by the above technology. The process has the advantages of few technical processes, quick preparation and batch production, and overcomes the defects of difficult molding, complex structure and the like of the traditional metal part preparation process.
The binder is the core of the metal powder injection molding technology, and has the effects of enhancing the fluidity and maintaining the shape of the billet, and the performance of the binder can influence the final effect of the whole metal powder injection molding technology.
At present, a polymer adhesive in the existing adhesive has a good technical effect in the field of powder injection, but in the injection process of the adhesive, formaldehyde generated by decomposition of polyformaldehyde is high in toxicity, and subsequent byproducts are high in corrosion to equipment, so that the application of the adhesive is limited due to the defects. The water-soluble adhesive is environment-friendly, but the metal parts formed by injection molding of the water-soluble adhesive have poor mechanical property and poor shape retention, and the further development of the water-soluble adhesive is influenced.
Disclosure of Invention
In order to overcome the defects and shortcomings of the prior art, the invention aims to provide an adhesive and application thereof in metal powder injection molding, wherein the adhesive is a water-soluble adhesive, and the mechanical property and the shape retention property of the adhesive are obviously improved compared with the traditional plastic-based adhesive.
The technical problem to be solved by the invention is realized by adopting the following technical scheme.
The invention provides an adhesive which comprises the following components in parts by weight: 72-78 parts of polyethylene glycol mixture, 14-16 parts of polyformaldehyde, 3-5 parts of polylactic resin, 2-3 parts of polymethyl methacrylate, 2-3 parts of dimethylacetamide, 0.4-1 part of alkyl diphenyl ether disulfonic acid sodium, 0.01 part of antioxidant, 1-2 parts of plasticizer and 1-3 parts of surfactant, wherein the mass ratio of polyethylene glycol 1000 to polyethylene glycol 1500 in the polyethylene glycol mixture is (2-4): 7.
the invention also provides a preparation method of the adhesive, which comprises the following steps:
preparing a mixture: under the condition of ultrasonic composite stirring, keeping the temperature at 176-190 ℃, uniformly mixing a polyethylene glycol mixture, polylactic acid resin, polymethyl methacrylate, dimethylacetamide and sodium alkyl diphenyl ether disulfonate according to a proportion, adding polyformaldehyde, and continuously mixing for 1-2 hours to prepare a mixture;
preparing an adhesive: adding antioxidant, plasticizer and surfactant into the mixture according to the proportion, and continuously performing ultrasonic composite stirring for 0.5-1.5 hours at the temperature of 175-185 ℃ to obtain the adhesive.
The invention also provides application of the adhesive for metal powder injection molding, which comprises the following steps:
preparing a feed: according to the weight portion, 74-78 parts of metal powder with the average particle size of 9-11 microns are preheated to 170-190 ℃ and kept, 24 parts of adhesive is added under the stirring speed of 20-60r/min for banburying for 1-2 hours to prepare melt, and granular feed is prepared after extrusion and granulation;
injection molding: injecting the granular feed to prepare a green body, wherein the injection temperature is 170-190 ℃, the mold temperature is 38-42 ℃, the injection pressure is 80-120MPa, and the injection speed is 40-60mm/s;
degreasing in water bath: degreasing the green body in water bath to obtain a green body;
and (3) high-temperature sintering: pre-sintering the blank at 800-850 ℃ for 1.5-2.5 hours, then heating to 1300-1350 ℃ for sintering for 2-2.5 hours, cooling to room temperature after completion, and performing post-treatment to obtain the metal part.
The adhesive, the preparation method thereof and the application of the adhesive in metal powder injection molding have the beneficial effects that:
(1) The dimethyl acetamide and the alkyl diphenyl ether sodium disulfonate are added into the raw materials of the adhesive, so that the mechanical property and the shape retention of the formed metal part can be effectively improved.
(2) The ultrasonic composite stirring mode is adopted in the preparation process of the adhesive, so that the mixing effect is enhanced, the internal stress of the material is enhanced, and the mechanical property and the shape retention of the formed metal part are improved.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The embodiment of the invention provides an adhesive which comprises the following components in parts by weight: 72-78 parts of polyethylene glycol mixture, 14-16 parts of polyformaldehyde, 3-5 parts of polylactic resin, 2-3 parts of polymethyl methacrylate, 2-3 parts of dimethylacetamide, 0.4-1 part of alkyl diphenyl ether disulfonic acid sodium, 0.01 part of antioxidant, 1-2 parts of plasticizer and 1-3 parts of surfactant, wherein the mass ratio of polyethylene glycol 1000 to polyethylene glycol 1500 in the polyethylene glycol mixture is (2-4): 7. n = O group in the dimethylacetamide can improve the activity of the near-spherical metal powder, enhance the internal stress of the formed metal part, and effectively improve the mechanical property and shape retention of the formed metal part by matching with a small amount of alkyl diphenyl ether disulfonic acid sodium. The dimethylacetamide and the alkyl diphenyl ether sodium disulfonate are matched with the good adhesive property of a polyethylene glycol mixture, the good fluidity of polyformaldehyde and the shape retention of polymethyl methacrylate, so that the adhesive prepared by the formula has excellent mechanical property and shape retention.
Further, in the preferred embodiment of the invention, the paint comprises the following components in parts by weight: 75 parts of a polyethylene glycol mixture, 15 parts of polyformaldehyde, 4 parts of polylactic resin, 2.5 parts of polymethyl methacrylate, 2.5 parts of dimethylacetamide, 0.7 part of sodium alkyl diphenyl ether disulfonate, 0.01 part of antioxidant, 1-2 parts of plasticizer and 1-3 parts of surfactant, wherein the mass ratio of polyethylene glycol 1000 to polyethylene glycol 1500 in the polyethylene glycol mixture is 3:7.
further, in a preferred embodiment of the invention, the antioxidant is ascorbyl palmitate or butylated hydroxyanisole.
Further, in a preferred embodiment of the present invention, the plasticizer is a phthalate.
Further, in a preferred embodiment of the invention, the surfactant is lecithin or polysorbate.
A preparation method of the adhesive comprises the following steps:
preparation of a mixture: under the condition of ultrasonic composite stirring, keeping the temperature at 176-190 ℃, uniformly mixing a polyethylene glycol mixture, polylactic acid resin, polymethyl methacrylate, dimethylacetamide and alkyl diphenyl ether sodium disulfonate according to a proportion, adding polyformaldehyde, and continuously mixing for 1-2 hours to prepare a mixture;
preparing an adhesive: adding antioxidant, plasticizer and surfactant into the mixture according to the proportion, and continuously performing ultrasonic composite stirring for 0.5-1.5 hours at the temperature of 175-185 ℃ to obtain the adhesive.
Further, in the preferred embodiment of the present invention, the process parameters of the ultrasonic composite stirring are as follows: the stirring speed is 30-60r/min, and the ultrasonic frequency is 30-40KHz. In the preparation process, the ultrasonic wave is added, so that the mixing effect is enhanced, the internal stress of the material is enhanced, and the mechanical property and the shape retention of the formed metal part are improved.
Use of a binder for injection moulding of metal powder, characterised in that it comprises the steps of:
preparing a feed: according to the parts by weight, 74-78 parts of metal powder with the average particle size of 9-11 microns are preheated to 170-190 ℃ and kept, 24 parts of adhesive is added under the stirring speed of 20-60r/min for banburying for 1-2 hours to prepare melt, and granular feed is prepared after extrusion granulation;
injection molding: injecting the granular feed to prepare a green body, wherein the injection temperature is 170-190 ℃, the mold temperature is 38-42 ℃, the injection pressure is 80-120MPa, and the injection speed is 40-60mm/s;
degreasing in a water bath: degreasing the green body in water bath to obtain a green body;
and (3) high-temperature sintering: pre-sintering the blank at 800-850 ℃ for 1.5-2.5 hours, then heating to 1300-1350 ℃ for sintering for 2-2.5 hours, cooling to room temperature after the sintering is finished, and obtaining the metal part after post-treatment.
Furthermore, in the preferred embodiment of the present invention, the degreasing temperature of the water bath degreasing is 76-80 ℃, and the degreasing time is 80-100min.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
This example proposes an adhesive comprising the following components: 76kg of polyethylene glycol mixture, 15kg of polyoxymethylene, 4kg of polylactic resin, 2.5kg of polymethyl methacrylate, 2.5kg of dimethylacetamide, 0.7kg of sodium alkyldiphenyloxide disulfonate, 0.01kg of butylated hydroxyanisole, 1.5kg of phthalate and 2kg of lecithin. Wherein the mass ratio of polyethylene glycol 1000 to polyethylene glycol 1500 in the polyethylene glycol mixture is 3:7.
in this embodiment, the antioxidant is butylated hydroxyanisole, in other embodiments, the antioxidant may be other antioxidants such as ascorbyl palmitate, and the technical effect of the adhesive of this embodiment of improving the mechanical properties and shape retention of the molded metal part can be achieved, and the technical effect is also within the scope of this embodiment.
In this embodiment, the plasticizer is phthalate, and in other embodiments, other plasticizers such as di-n-octyl phthalate and butyl benzyl phthalate may be used, and the technical effects of the plasticizer are within the scope of the present embodiment.
It should be understood that the surfactant is lecithin in this embodiment, and in other embodiments, the surfactant may also be other types of plasticizers such as polysorbate or fatty acid glyceride, and the present embodiment is within the protection scope of this embodiment as long as the technical effects of this embodiment can be achieved.
The embodiment also provides a preparation method of the adhesive, which comprises the following steps:
preparation of a mixture: uniformly mixing 22.5kg of polyethylene glycol 1000, 52.5kg of polyethylene glycol 1500, 4kg of polylactic resin, 2.5kg of polymethyl methacrylate, 2.5kg of dimethylacetamide and 0.7kg of alkyl diphenyl ether disulfonic acid sodium under the conditions that the stirring speed is 45r/min and the ultrasonic frequency is 35KHz, keeping the temperature at 183 ℃, and then adding 15kg of polyformaldehyde to continuously mix for 1.5 hours to prepare a mixture;
preparing an adhesive: adding 0.01kg of butylated hydroxyanisole, 1.5kg of phthalate and 2kg of lecithin into the mixture, and continuously performing ultrasonic composite stirring for 1 hour under the conditions of constant temperature of 180 ℃, rotation speed of 45r/min and ultrasonic frequency of 35KHz to obtain the adhesive.
The present embodiment further proposes the use of a binder for injection molding of metal powder, comprising the steps of:
preparing a feed: preheating 76kg of metal powder (titanium alloy in the embodiment) with the average particle size of 9-11 microns to 180 ℃, keeping the temperature, adding 24kg of adhesive under the stirring speed of 40r/min, banburying for 1.5 hours to obtain a melt, and extruding and granulating to obtain a granular feed;
injection molding: injecting and molding the granular feed to prepare a green body, wherein the injection temperature is 180 ℃, the mold temperature is 40 ℃, the injection pressure is 100MPa, and the injection speed is 50mm/s;
degreasing in water bath: degreasing the green body in water bath at a degreasing temperature of 78 ℃, wherein the degreasing time is 90min to obtain the green body;
and (3) high-temperature sintering: pre-sintering the blank at 850 ℃ for 2 hours, then heating to 1350 ℃ for sintering for 2 hours, cooling to room temperature after the sintering is finished, and performing post-treatment to obtain the metal part. In this embodiment, the above process parameters are adopted for high-temperature sintering, and in other embodiments, the following process parameter ranges may be selected according to the actually used metal powder, the green body is pre-sintered at 800-850 ℃ for 1.5-2.5 hours, then the temperature is raised to 1300-1350 ℃ for sintering for 2-2.5 hours, and then the temperature is reduced to room temperature after completion, and the metal part is prepared after post-treatment.
Example 2
The embodiment provides an adhesive, which comprises the following components: 72kg of polyethylene glycol mixture, 14kg of polyoxymethylene, 5kg of polylactic acid resin, 2kg of polymethyl methacrylate, 3kg of dimethylacetamide, 0.4kg of sodium alkyldiphenyloxide disulfonate, 0.01kg of ascorbyl palmitate, 2kg of phthalate and 1kg of polysorbate. Wherein the mass ratio of polyethylene glycol 1000 to polyethylene glycol 1500 in the polyethylene glycol mixture is 4:7.
in the present embodiment, the antioxidant is ascorbyl palmitate, and in other embodiments, the antioxidant may be other antioxidants such as butylated hydroxyanisole, and the technical effect of the adhesive of the present embodiment on improving the mechanical properties and shape retention of the molded metal part can be achieved, and the technical effect is also within the protection scope of the present embodiment.
In this embodiment, the plasticizer is phthalate, and in other embodiments, other plasticizers such as di-n-octyl phthalate and butyl benzyl phthalate may be used, and the technical effects of the plasticizer can be achieved within the scope of the present embodiment.
It should be understood that the surfactant is polysorbate in this embodiment, and other types of plasticizers such as lecithin and fatty glyceride may be used as the surfactant in other embodiments, and the present invention is within the scope of this embodiment as long as the technical effects of this embodiment can be achieved.
The embodiment also provides a preparation method of the adhesive, which comprises the following steps:
preparing a mixture: uniformly mixing 28.8kg of polyethylene glycol 1000, 43.2kg of polyethylene glycol 1500, 5kg of polylactic resin, 2kg of polymethyl methacrylate, 3kg of dimethylacetamide and 0.4kg of sodium alkyl diphenyl ether disulfonate at the constant temperature of 176 ℃ under the conditions that the stirring speed is 30r/min and the ultrasonic frequency is 40KHz, and then adding 14kg of polyformaldehyde to continuously mix for 1 hour to prepare a mixture;
preparing an adhesive: 0.01kg of ascorbyl palmitate, 2kg of phthalate and 1kg of polysorbate are added into the mixture, and the mixture is continuously ultrasonically and compositely stirred for 0.5 hour under the conditions of constant temperature of 185 ℃, the rotating speed of 30r/min and the ultrasonic frequency of 40KHz to obtain the adhesive.
The present embodiment further proposes the use of a binder for injection molding of metal powder, comprising the steps of:
preparing a feed: preheating 74kg of metal powder (titanium alloy in the embodiment) with the average particle size of 9-11 microns to 190 ℃ and keeping, adding 24kg of adhesive under the stirring speed of 20r/min for banburying for 2 hours to prepare a melt, and extruding and granulating to prepare a granular feed;
injection molding: injecting and molding the granular feed to prepare a green body, wherein the injection temperature is 170 ℃, the mold temperature is 42 ℃, the injection pressure is 80MPa, and the injection speed is 60mm/s;
degreasing in a water bath: degreasing the green body in water bath at a degreasing temperature of 76 ℃, and obtaining the green body after degreasing for 100 min;
and (3) high-temperature sintering: pre-sintering the blank at 850 ℃ for 2 hours, then heating to 1350 ℃ for sintering for 2 hours, cooling to room temperature after the sintering is finished, and performing post-treatment to obtain the metal part.
Example 3
The embodiment provides an adhesive, which comprises the following components: 78kg of polyethylene glycol mixture, 16kg of polyoxymethylene, 3kg of polylactic acid resin, 3kg of polymethyl methacrylate, 2kg of dimethylacetamide, 1kg of sodium alkyldiphenyloxide disulfonate, 0.01kg of butylated hydroxyanisole, 1kg of phthalate and 1kg of polysorbate. Wherein the mass ratio of polyethylene glycol 1000 to polyethylene glycol 1500 in the polyethylene glycol mixture is 2:7.
in this embodiment, the antioxidant is butylated hydroxyanisole, in other embodiments, the antioxidant may be other antioxidants such as ascorbyl palmitate, and the technical effects of the adhesive of this embodiment on improving the poor mechanical properties and shape retention of the formed metal parts can be achieved, and the protection scope of this embodiment is also included.
In this embodiment, the plasticizer is phthalate, and in other embodiments, other plasticizers such as di-n-octyl phthalate and butyl benzyl phthalate may be used, and the technical effects of the plasticizer are within the scope of the present embodiment.
It should be understood that the surfactant is polysorbate in this embodiment, and other types of plasticizers such as lecithin and fatty glyceride may be used as the surfactant in other embodiments, and the present invention is within the scope of this embodiment as long as the technical effects of this embodiment can be achieved.
The embodiment also provides a preparation method of the adhesive, which comprises the following steps:
preparation of a mixture: uniformly mixing 15.6kg of polyethylene glycol 1000, 62.4kg of polyethylene glycol 1500, 3kg of polylactic resin, 3kg of polymethyl methacrylate, 2kg of dimethylacetamide and 1kg of alkyl diphenyl ether disulfonic acid sodium at the constant temperature of 190 ℃ under the conditions that the stirring speed is 60r/min and the ultrasonic frequency is 30KHz, and then adding 16kg of polyformaldehyde to continuously mix for 2 hours to prepare a mixture;
preparing an adhesive: and adding 0.01kg of butylated hydroxyanisole, 2kg of phthalate and 3kg of polysorbate into the mixture, and continuously performing ultrasonic composite stirring for 1.5 hours at the constant temperature of 176 ℃, the rotation speed of 60r/min and the ultrasonic frequency of 30KHz to obtain the adhesive.
The present embodiment also proposes the use of a binder for metal powder injection molding, comprising the steps of:
preparing a feed: preheating 78kg of metal powder (titanium alloy in the embodiment) with the average particle size of 9-11 microns to 170 ℃, keeping the temperature, adding 24kg of adhesive under the stirring speed of 60r/min, banburying for 1 hour to obtain a melt, and extruding and granulating to obtain a granular feed;
injection molding: injecting and molding the granular feed to prepare a green body, wherein the injection temperature is 190 ℃, the mold temperature is 39 ℃, the injection pressure is 120MPa, and the injection speed is 40mm/s;
degreasing in a water bath: degreasing the green body in water bath at a degreasing temperature of 80 ℃, and degreasing for 80min to obtain a green body;
and (3) high-temperature sintering: pre-sintering the blank at 850 ℃ for 2 hours, then heating to 1350 ℃ for sintering for 2 hours, cooling to room temperature after the sintering is finished, and performing post-treatment to obtain the metal part.
Comparative example 1
The difference between this comparative example 1 and example 1 is that the raw material formulation of the binder is different, and the preparation method of the binder and the application of the binder to the metal powder injection molding are completely the same. Specifically, the raw material formula of the adhesive is lack of dimethylacetamide and alkyl diphenyl ether disulfonic acid sodium.
Comparative example 2
The difference between this comparative example 2 and example 1 is that the binder preparation method is slightly different, and the raw material formulation of the binder and the application of the binder to metal powder injection molding are completely the same. Specifically, in the preparation method of the binder, the steps of preparing the mixture and preparing the binder do not have ultrasonic conditions.
Test examples
This test example is intended to illustrate the mechanical properties of the metal parts produced. The experimental example adopts a GB/T228-2010 metal material tensile test method. The tensile strength and yield strength of the metal parts prepared in examples 1 to 3 and comparative examples 1 to 2 were measured, and the test results are shown in table 1 below.
As can be seen from table 1, the tensile strength and yield strength of the metal parts prepared in examples 1 to 3 were greater than those of the metal parts of comparative example 1 and comparative example 2. Meanwhile, the mechanical property of the metal part in the comparative example 2 is superior to that in the comparative example 1, the fact that dimethylacetamide and sodium alkyl diphenyl ether disulfonate are added into the ingredients of the adhesive has a positive effect on the final performance of the adhesive, and the use effect of the adhesive is greatly improved. And the preparation process of the adhesive adopts an ultrasonic composite stirring method, so that the bonding effect of the prepared adhesive is also improved to a certain extent.
TABLE 1 tensile Strength and yield Strength of Metal parts prepared in examples 1-3 and comparative examples 1-2
| Tensile strength/MPa | Yield strength/MPa | |
| Example 1 | 943 | 929 |
| Example 2 | 926 | 902 |
| Example 3 | 929 | 907 |
| Comparative example 1 | 721 | 698 |
| Comparative example 2 | 889 | 863 |
In summary, the present invention provides an adhesive, a method for preparing the same, and an application of the adhesive for metal powder injection molding. The adhesive is prepared by adding dimethyl acetamide and alkyl diphenyl ether sodium disulfonate into raw materials, so that the mechanical property and the shape retention of a formed metal part can be effectively improved. The ultrasonic composite stirring mode is adopted in the preparation process of the adhesive, so that the mixing effect is enhanced, the internal stress of the material is enhanced, and the mechanical property and the shape retention of the formed metal part are improved.
The embodiments described above are some, but not all embodiments of the invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (6)
1. The adhesive is characterized by comprising the following components in parts by weight: 72-78 parts of a polyethylene glycol mixture, 14-16 parts of polyformaldehyde, 3-5 parts of polylactic resin, 2-3 parts of polymethyl methacrylate, 2-3 parts of dimethylacetamide, 0.4-1 part of sodium alkyl diphenyl ether disulfonate, 0.01 part of an antioxidant, 1-2 parts of a plasticizer and 1-3 parts of a surfactant, wherein the mass ratio of polyethylene glycol 1000 to polyethylene glycol 1500 in the polyethylene glycol mixture is (2-4): 7, the antioxidant is ascorbyl palmitate or butylated hydroxyanisole, the plasticizer is phthalate, and the surfactant is lecithin or polysorbate.
2. An adhesive according to claim 1, comprising the following components in parts by weight: 75 parts of a polyethylene glycol mixture, 15 parts of polyformaldehyde, 4 parts of polylactic resin, 2.5 parts of polymethyl methacrylate, 2.5 parts of dimethylacetamide, 0.7 part of sodium alkyl diphenyl ether disulfonate, 0.01 part of antioxidant, 1-2 parts of plasticizer and 1-3 parts of surfactant, wherein the mass ratio of polyethylene glycol 1000 to polyethylene glycol 1500 in the polyethylene glycol mixture is 3:7.
3. a method for preparing an adhesive according to any one of claims 1-2, characterized in that it comprises the steps of:
preparing a mixture: under the condition of ultrasonic composite stirring, keeping the temperature at 176-190 ℃, uniformly mixing the polyethylene glycol mixture, the polylactic acid resin, the polymethyl methacrylate, the dimethylacetamide and the sodium alkyl diphenyl ether disulfonate according to the proportion, adding the polyformaldehyde, and continuously mixing for 1-2 hours to prepare a mixture;
preparing an adhesive: adding the antioxidant, the plasticizer and the surfactant into the mixture according to the proportion, and continuously carrying out ultrasonic composite stirring for 0.5-1.5 hours at the temperature of 175-185 ℃ to obtain the adhesive.
4. The method for preparing the adhesive according to claim 3, wherein the process parameters of the ultrasonic composite stirring are as follows: the stirring speed is 30-60r/min, and the ultrasonic frequency is 30-40KHz.
5. Use of a binder according to claim 1 for injection moulding of metal powder, characterised in that it comprises the following steps:
preparing a feed: according to the weight portion, 74-78 parts of metal powder with the average particle size of 9-11 microns are preheated to 170-190 ℃ and kept, 24 parts of adhesive is added under the stirring speed of 20-60r/min for banburying for 1-2 hours to prepare melt, and granular feed is prepared after extrusion and granulation;
injection molding: injecting and molding the granular feed to prepare a green body, wherein the injection temperature is 170-190 ℃, the mold temperature is 38-42 ℃, the injection pressure is 80-120Mpa, and the injection speed is 40-60mm/s;
degreasing in water bath: degreasing the green body in water bath to obtain a green body;
and (3) high-temperature sintering: pre-sintering the blank at 800-850 ℃ for 1.5-2.5 hours, then heating to 1300-1350 ℃ for sintering for 2-2.5 hours, cooling to room temperature after completion, and performing post-treatment to obtain the metal part.
6. The use of the binder according to claim 5 for injection molding of metal powder, wherein the degreasing temperature of the water bath degreasing is 76-80 ℃ and the degreasing time is 80-100min.
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| JP2007246310A (en) * | 2006-03-14 | 2007-09-27 | Lintec Corp | Composition for forming dielectric layer, green sheet, substrate for forming dielectric layer and method of manufacturing the same |
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| US20130338311A1 (en) * | 2011-02-09 | 2013-12-19 | Umg Abs, Ltd. | Polyorganosiloxane latex, graft copolymer using the same, thermoplastic resin composition, and molded body |
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| CN1400984A (en) * | 2000-02-16 | 2003-03-05 | 三洋化成工业株式会社 | Resin dispersions having uniform particle diameters, resin particles and processes for producing both |
| JP2007246310A (en) * | 2006-03-14 | 2007-09-27 | Lintec Corp | Composition for forming dielectric layer, green sheet, substrate for forming dielectric layer and method of manufacturing the same |
| CN106270522A (en) * | 2016-09-23 | 2017-01-04 | 江西悦安超细金属有限公司 | A kind of for metal injection molded feeding and preparation method thereof |
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