CN114714637A - Super-polyethylene porous heat curing structure and curing method - Google Patents
Super-polyethylene porous heat curing structure and curing method Download PDFInfo
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- CN114714637A CN114714637A CN202210375286.6A CN202210375286A CN114714637A CN 114714637 A CN114714637 A CN 114714637A CN 202210375286 A CN202210375286 A CN 202210375286A CN 114714637 A CN114714637 A CN 114714637A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
- B29C67/02—Moulding by agglomerating
- B29C67/04—Sintering
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/42—Low-temperature sample treatment, e.g. cryofixation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
- G01N2001/366—Moulds; Demoulding
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention provides a porous thermal curing structure of super polyethylene and a curing method, the structure comprises a thermal insulation cavity, a heating cavity and a mold, wherein a storage rack is arranged in the thermal insulation cavity, the mold is horizontally placed on the storage rack, the thermal insulation cavity and the heating cavity are respectively connected through a liquid inlet pipe and a liquid outlet pipe, and a temperature control switch and a water pump are arranged on the liquid inlet pipe. According to the invention, liquid is used as a medium for heat transfer, the mold in a porous structure can increase the contact area between a polyethylene sample and an external solution, so that the solution can easily enter and exit a gap between polyethylene powder, the heating process and the heat preservation process are separated by adopting the structures of the heat preservation cavity and the heating cavity, the solution in the device flows, and the temperature of the solution in the heat preservation cavity is strictly controlled, so that the heat exchange efficiency is improved, the permeability of the mold is improved, the polyethylene sample is uniformly heated in the processing process, the super polyethylene product is not influenced by temperature gradient, the density and the pores are uniform, and the filtering effect is excellent.
Description
Technical Field
The invention relates to the technical field of material forming and processing, in particular to a porous thermal curing structure and a curing method for polyethylene.
Background
The product prepared by using polyethylene as a raw material through thermosetting has the advantages of low price, excellent comprehensive performance, strong acid and alkali corrosion resistance, organic solvent dissolution resistance, high strength and strong pressure resistance, and is suitable for water treatment, chemical product filtration and other working conditions with large flow.
At present, the processing method of the super polyethylene product is usually sintering molding, and the manufacturing process comprises the steps of pouring polyethylene powder into a mold, pressing the polyethylene powder to be uniform, heating the mold for multiple times, and finally demolding and molding. By heating the mold, the heat is mainly transferred in a heat conduction manner in the process, so that a temperature gradient inevitably exists, and the part close to the heat source is over-sintered and the part far away from the heat source is under-sintered. The final product has different sintering degrees, different hardness and uneven pores, and not only has poor structural strength, but also affects the use effect.
In order to make the polyethylene powder heated uniformly in the processing process, the influence of the temperature gradient on the production process must be solved, and the heat transfer mode is changed from heat conduction to convection heat transfer. Therefore, in order to improve the quality of the obtained super polyethylene product, the traditional method of heating the mold must be changed into the method of using liquid as an intermediate medium for heat transfer. And the traditional mould is soaked in liquid and directly heated, so that the heat can not be basically transferred in a convection heat transfer mode, the heat exchange efficiency is low, the permeability is poor, and the liquid is difficult to freely enter and exit pores among the polyethylene powder. Therefore, from the mold and the heat transfer system, a set of processing device with good permeability and heat exchange performance and taking convection heat transfer as a main heat transfer mode needs to be redesigned, and a proper technological process needs to be established.
Disclosure of Invention
The invention aims to provide a porous thermal curing structure and a curing method for polyethylene, which not only solve the problem of insufficient heat exchange, but also ensure that the main heat transfer mode is convective heat transfer to the maximum extent, so that the obtained polyethylene product has uniform density and pore size and excellent filtering effect;
according to one object of the invention, the invention provides a porous thermal curing structure for polyethylene, which comprises a thermal insulation cavity, a heating cavity and a mold, wherein a storage rack is arranged in the thermal insulation cavity, the mold is horizontally placed on the storage rack, the thermal insulation cavity and the heating cavity are respectively connected through a liquid inlet pipe and a liquid outlet pipe, and a temperature control switch and a water pump are arranged on the liquid inlet pipe.
Furthermore, a heat preservation cavity cover is arranged above the heat preservation cavity, a pressure regulating valve is arranged on the heat preservation cavity cover, the heat preservation cavity is connected with the heat preservation cavity cover in an up-down opposite mode, a first connecting rod is arranged at one end of the heat preservation cavity cover, a second connecting rod is arranged at one end of the heat preservation cavity, the first connecting rod is connected with the second connecting rod in a hinged mode, and the heat preservation cavity cover is connected with the other end of the heat preservation cavity through a locking device.
Further, locking device includes first nut, gasket and first bolt, first nut, the gasket with first bolt will keep warm the chamber lid with keep warm the cavity locking.
Further, the heat preservation cavity is provided with a liquid inlet and a liquid outlet, the liquid outlet is located above the liquid inlet, the liquid inlet pipe is connected with the liquid inlet, and the liquid outlet pipe is connected with the liquid outlet.
Furthermore, the mould is formed by splicing loose and porous foam metal plates, and comprises an upper mould, a lower mould and a chassis, wherein a through hole is formed in the cavity bottom of the lower mould, the chassis is arranged at the cavity bottom of the lower mould, a polyethylene sample is placed in a mould cavity between the chassis and the upper mould, a connecting hole is formed in the edge of the lower mould, and a second bolt penetrates through the connecting hole to be connected with a spring piece and a second nut, so that the upper mould and the lower mould are compressed tightly.
Further, the foamed metal plate is made of foamed aluminum, foamed iron nickel or foamed copper nickel, and the aperture of the foamed metal plate is 30-50 ppi.
According to another object of the present invention, the present invention provides a porous thermal curing method of polyethylene, comprising the steps of:
s1, pretreating the polyethylene powder, and putting the polyethylene powder into a tabletting mold for compaction;
s2, discharging the solution in the heat preservation cavity, and adding enough solution into the heating cavity;
s3, putting the compacted polyethylene sample into a mold cavity, fixing the mold, and placing the mold on a storage rack in order;
s4, sealing the container, heating the solution in the heating cavity, when the temperature reaches a specified temperature, opening the temperature control switch, pumping the solution in the heating cavity to the heat preservation cavity by the operation of the water pump, and heating and preserving the heat of the polyethylene sample;
s5, liquid overflowing from the heat preservation cavity flows back to the heating cavity, the heating cavity is heated continuously, the temperature control switch and the water pump are turned off when the temperature in the cavity is reduced, and the temperature control switch and the water pump are turned on again when the temperature reaches the specified temperature;
and S6, keeping the temperature for 5-10 min, completely heating and solidifying the polyethylene sample, cooling, releasing the mold after the temperature is reduced to room temperature, and removing the solution adhered to the obtained product.
Further, in S1, a powder tableting machine is used to pre-process the polyethylene powder, wherein the shape of the cavity of the powder tableting mold is the same as the shape of the cavity of the mold, and the pressure value of the powder tableting machine ranges from 8Mpa to 10 Mpa.
Further, in S2, the boiling point of the selective solution is changed by adjusting the pressure of the pressure regulating valve.
Further, in S4, the temperature control switch is turned on at 140 to 155 ℃, i.e., the heat curing temperature of the polyethylene powder.
According to the technical scheme, liquid is used as a medium for heat transfer, the mold in a porous structure can increase the contact area of a polyethylene sample and an external solution, so that the solution can easily enter and exit a gap between polyethylene powder, the heating process and the heat preservation process are separated by adopting the structures of the heat preservation cavity and the heating cavity, the solution in the device flows, and the temperature of the solution in the heat preservation cavity is strictly controlled, so that the heat exchange efficiency is improved, the permeability of the mold is improved, the polyethylene sample is uniformly heated in the processing process, a super polyethylene product is not influenced by temperature gradient, the density and the pores are uniform, and the filtering effect is excellent.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is an enlarged view of a portion of the embodiment of the present invention shown in FIG. 1;
FIG. 3 is a schematic structural diagram of a mold according to an embodiment of the present invention;
FIG. 4 is a schematic view of the surface structure of a metal foam sheet according to an embodiment of the present invention;
description of reference numerals:
1. a heat preservation cavity; 2. a heat preservation cavity cover; 3. a first link; 4. a second link; 5. a first nut; 6. a gasket; 7. a first bolt; 8. a pressure control valve; 9. a mold; 901. an upper die; 902. a lower die; 903. a chassis; 904. a second nut; 905. a second bolt; 906. a spring plate; 907. a through hole; 10. a rack; 11. a liquid outlet pipe; 12. a heating cavity; 13. a temperature control switch; 14. a water pump; 15. a liquid inlet pipe; 16. polyethylene samples; 17. and (3) solution.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be apparent that the described embodiments are some, but not all, embodiments of the present 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.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
Example 1
As shown in fig. 1-2, a porous thermal curing structure of polyethylene comprises a thermal insulation cavity 1, a thermal insulation cavity cover 2, a first connecting rod 3, a second connecting rod 4, a first nut 5, a gasket 6, a first bolt 7, a pressure regulating valve 8, a mold 9, a shelf 10, a liquid outlet pipe 11, a heating cavity 12, a temperature control switch 13, a water pump 14, and a liquid inlet pipe 15;
wherein, heat preservation cavity 1 and heat preservation chamber lid 2 are the opposition from top to bottom to be connected, form inclosed heat preservation chamber, and first connecting rod 3 is connected on heat preservation chamber lid 2, and second connecting rod 4 is connected on heat preservation cavity 1, and first nut 5, gasket 6, first bolt 7 are with heat preservation chamber lid 2 and heat preservation cavity 1 locking. By adopting the design of the first connecting rod 3 and the second connecting rod 4, the purpose that the heat preservation cavity can be opened and closed quickly can be achieved, and the mold 9 can be conveniently sent into and taken out. The heat preservation cavity can be an upper-lower flip type heat preservation cavity 1 with an opening at the top, and can also be an open side type heat preservation cavity 1 with an opening at the side, and the final purpose of the design is to realize quick opening and quick closing of the heat preservation cavity and quick feeding and quick taking out of the mold.
After the heating solution reaches a certain temperature, the temperature control switch 13 is turned on, and the water pump 14 starts to work. The solution starts from the heating cavity 12 and reaches the heat preservation cavity 1 through the temperature control switch 13, the water pump 14 and the liquid inlet pipe 15 under the action of the water pump 14. When the water level of the solution in the heat preservation cavity 1 reaches the liquid outlet, the solution overflows from the liquid outlet and flows back to the heating cavity 12 through the liquid outlet pipe 11 to be reheated. When the temperature of the solution in the heating chamber 12 does not reach the opening temperature of the temperature control switch 13, the water pump 14 is turned off, and the water pump 14 is operated again when the temperature reaches a specified value.
The heat preservation cavity formed by connecting the heat preservation cavity body 1 and the heat preservation cavity cover 2, the liquid outlet pipe 11, the heating cavity 12, the temperature control switch 13, the water pump 14 and the liquid inlet pipe 15 are sequentially connected to form a closed loop, and the closed loop can bear a pressure value not greater than 2 atmospheric pressures in the working process. The working pressure of the closed loop can be adjusted so that the boiling point of some selected solutions can not reach the thermal curing temperature of the polyethylene, and the pressure regulating valve 8 is arranged to expand the selection range of the solutions.
As shown in fig. 3 to 4, the mold 9 is composed of an upper mold 901, a lower mold 902, a bottom plate 903, a second nut 904, a second bolt 905, and a spring piece 906. The bottom of the cavity of the lower die 902 is provided with a through hole 907, the bottom plate 903 is arranged at the bottom of the cavity of the lower die 902, and the polyethylene sample is placed in the die cavity between the bottom plate 903 and the upper die 901. The cured product is inevitably adhered to the mold 9 and is difficult to be released. Therefore, the through hole 907 and the bottom plate 903 are provided, and the bottom plate 903 is ejected through the through hole 907 during demolding, so that demolding operation can be completed. The edge of the lower die 902 is provided with a connecting hole, and a second bolt 905, a spring piece 906 and a second nut 904 are arranged in the connecting hole to tightly press the upper die 901. The upper die 901 is fixed on the lower die 902 by using the spring piece 906, the second nut 904, the second bolt 905 and other fasteners, on one hand, the volume can be changed in the sintering process of the polyethylene powder, and the fixing mode can ensure that the obtained product keeps the original shape and does not change or generate flaws; on the other hand, the spring piece 906 can be designed to achieve the effect of quick disassembly, thereby facilitating the mass production of the filter element.
The used mould 9 is formed by splicing loose and porous foam metal plates which are loose and porous and have excellent water permeability. The polyethylene sample is placed in the die 9 made of the material, so that the contact area of the sample and water can be effectively increased, and the heat transfer and heat exchange in the curing process are more sufficient. The shape of the inner cavity of the mold 9 depends on the shape of the polyethylene product to be finally obtained, and includes, but is not limited to, a cylinder and a prism, the foam metal plate is made into the required shape by cutting, bending and other processing methods, and then the blocks are made into the required mold 9 by welding and other methods, and according to the method, the molds 9 with various shapes can be spliced.
The material of the foamed metal plate can be one of foamed aluminum, foamed iron nickel and foamed copper nickel, but is not limited to the above types, and the foamed metal plate must be high temperature resistant and have certain strength, and can withstand common machining processes such as turning, milling and the like.
The aperture of the selected foam metal plate should not too big nor too little, if the aperture is too big, can cause 9 intracavity polyethylene samples of mould to outwards leak, if the hole undersize, will lead to the water permeability of mould 9 to reduce, hinders the solution to get into the hole between the polyethylene powder, thereby the heat transfer is poor influences the solidification effect, and the optimum aperture of foam metal plate should be 30 ~ 50 ppi.
The porous heat curing method for the polyethylene comprises the following steps:
s1, pretreating polyethylene powder by using a powder tablet press, and putting the polyethylene powder into a tablet pressing die for compaction; the shape of the inner cavity of the powder tabletting mould is the same as that of the inner cavity of the mould, and the pressure value range of the powder tabletting machine is 8 Mpa-10 Mpa.
S2, discharging the solution in the heat preservation cavity, and adding enough solution 17 into the heating cavity; the solution can be any solution which does not react with the polyethylene, the principle of solution selection is that the solution can be easily separated from the product, the original components and properties of the super polyethylene product are not changed, and the boiling point of the solution can be changed by adjusting the pressure of the pressure regulating valve 8. The solution is used as an intermediate medium for heat transfer in the curing process, the contact area between the solution and external liquid is increased by using a loose porous foam metal plate as a material of the mold 9, the solution can freely enter and exit pores among the polyethylene powder, the solution in the pores is equivalent to numerous tiny heat sources at the moment, heat is transferred to the polyethylene powder, and the polyethylene powder is heated and cured.
S3, putting the compacted polyethylene sample 16 into a mold cavity, fixing the upper mold, and placing the upper mold on a storage rack in an orderly arrangement manner;
s4, sealing the container, heating the solution in the heating cavity, when the temperature reaches a specified temperature, opening the temperature control switch, operating the water pump, pumping the solution in the heating cavity to the heat preservation cavity through the liquid inlet pipe, and heating and preserving the heat of the polyethylene sample; the starting temperature of the temperature control switch 13 is 140-155 ℃, namely the thermosetting temperature of the polyethylene powder, and the starting and the stopping of the water pump 14 of the temperature control switch 13 are synchronous, so that the problem that the solidification effect is influenced by pumping the solution into the heat-insulating cavity 1 when the temperature does not meet the requirement is avoided.
S5, liquid overflowing from the heat preservation cavity flows back to the heating cavity through the liquid outlet pipe, the heating cavity is heated continuously, the temperature control switch and the water pump are turned off temporarily when the temperature in the heating cavity is reduced, and the heating cavity is turned on again when the temperature reaches the specified temperature;
and S6, keeping the temperature for 5-10 min, completely heating and solidifying the polyethylene sample, cooling to room temperature, releasing the mold, and removing the solution adhered to the product by drying, airing and the like.
The heating cavity and the heat preservation cavity are respectively arranged, the heating device and the heat preservation device are separated, and the direct heating mode is different from the direct heating mode, so that the heat can be prevented from being transferred through the contact between solids, and most heat transfer modes of the device are mainly convective heat transfer. In the curing process, the flow of the liquid can also effectively drive heat exchange, and the heat exchange efficiency is improved.
The traditional manufacturing method of the super polyethylene filter element is to pour polyethylene powder into a mould, press the powder to be uniform, heat the mould for many times, and finally demould and form. The method of directly heating the mould is adopted, the heat transfer mode is mainly heat conduction, and the existence of temperature gradient causes the curing of the super polyethylene product to be uneven, thereby influencing the filtering effect. Therefore, the way of transferring heat must be changed from heat conduction to convection heat transfer. The technical scheme of the invention provides a porous heat curing structure of polyethylene, which takes solution as a heat transfer medium, and changes the heat transfer mode mainly based on heat conduction in the traditional method into convection heat transfer through redesigning a mould, a heat transfer system and a process. The invention adopts loose and porous foam metal as a raw material for manufacturing the die, the die with a porous structure can increase the contact area of a sample and external liquid, a solution can freely enter and exit the die and permeate into pores among polyethylene particles, liquid drops in the pores are equivalent to numerous fine heat sources, heat is uniformly brought to polyethylene powder, and the powder is uniformly heated in the curing process. Adopt heat preservation chamber, drain pipe, heating chamber, temperature control switch, water pump, the feed liquor pipe that heat preservation chamber lid and heat preservation cavity are connected and are formed to constitute heating system, with heating process and heat preservation process separation to make the rivers in the device flow, the temperature of the interior solution of strict control heat preservation chamber is distinguished from directly putting the mould in the liquid of heating intracavity and direct heating, not only solves the insufficient problem of heat transfer, and the at utmost guarantees that thermal main transfer mode is the heat convection. The super polyethylene product produced by the structure is not influenced by temperature gradient, and has uniform density and pores and excellent filtering effect.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a porous thermosetting structure of super polyethylene, its characterized in that, includes heat preservation cavity, heating chamber and mould, be equipped with the supporter in the heat preservation cavity, the mould level put in on the supporter, heat preservation cavity with it connects through feed liquor pipe and drain pipe respectively to heat between the chamber, be equipped with temperature control switch and water pump on the feed liquor pipe.
2. The porous heat curing structure of polyethylene according to claim 1, wherein a heat preservation cover is arranged above the heat preservation cavity, a pressure regulating valve is arranged on the heat preservation cover, the heat preservation cavity and the heat preservation cover are connected in an up-down opposite mode, a first connecting rod is arranged at one end of the heat preservation cover, a second connecting rod is arranged at one end of the heat preservation cavity, the first connecting rod and the second connecting rod are connected in a hinged mode, and the heat preservation cover and the other end of the heat preservation cavity are connected through a locking device.
3. The porous and thermosetting polyethylene structure according to claim 2, wherein the locking device comprises a first nut, a gasket and a first bolt, and the first nut, the gasket and the first bolt lock the insulating cavity cover and the insulating cavity body.
4. The porous heat-curing structure of claim 1, wherein the heat-insulating cavity has a liquid inlet and a liquid outlet, the liquid outlet is located above the liquid inlet, the liquid inlet pipe is connected to the liquid inlet, and the liquid outlet pipe is connected to the liquid outlet.
5. The porous polyethylene thermocuring structure according to claim 1, wherein the mold is formed by splicing loose and porous foam metal plates and comprises an upper mold, a lower mold and a base plate, a through hole is formed in the bottom of a cavity of the lower mold, the base plate is arranged at the bottom of the cavity of the lower mold, a polyethylene sample is placed in a mold cavity between the base plate and the upper mold, a connecting hole is formed in the edge of the lower mold, and a second bolt penetrates through the connecting hole to be connected with a spring piece and a second nut to tightly press the upper mold and the lower mold.
6. The porous and thermosetting structure of claim 5, wherein the foamed metal plate is made of foamed aluminum, foamed iron nickel or foamed copper nickel, and the pore size of the foamed metal plate is 30-50 ppi.
7. A porous thermal curing method for super polyethylene is characterized by comprising the following steps:
s1, pretreating the polyethylene powder, and putting the polyethylene powder into a tabletting mould to compact the polyethylene powder;
s2, discharging the solution in the heat preservation cavity, and adding enough solution into the heating cavity;
s3, putting the compacted polyethylene sample into a mold cavity, fixing the mold, and placing the mold on a storage rack in order;
s4, sealing the container, heating the solution in the heating cavity, when the temperature reaches a specified temperature, opening the temperature control switch, pumping the solution in the heating cavity to the heat preservation cavity by the operation of the water pump, and heating and preserving the heat of the polyethylene sample;
s5, liquid overflowing from the heat preservation cavity flows back to the heating cavity, the heating cavity is heated continuously, the temperature control switch and the water pump are turned off when the temperature in the cavity is reduced, and the temperature control switch and the water pump are turned on again when the temperature reaches the specified temperature;
and S6, keeping the temperature for 5-10 min, completely heating and solidifying the polyethylene sample, cooling, releasing the mold after the temperature is reduced to room temperature, and removing the solution adhered to the obtained product.
8. The porous thermosetting method of polyethylene according to claim 7, wherein the polyethylene powder is pretreated using a powder tablet press, the shape of the cavity of the powder tablet press is the same as the shape of the cavity of the die, and the pressure value of the powder tablet press is in the range of 8Mpa to 10Mpa at S1.
9. The porous thermosetting method of claim 7, wherein in S2, the boiling point of the selective solution is changed by adjusting the pressure of the pressure regulating valve.
10. The porous heat curing method of polyethylene according to claim 7, wherein the temperature control switch is turned on at 140 ℃ to 155 ℃ in S4, which is the heat curing temperature of the polyethylene powder.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200948601A (en) * | 2008-05-16 | 2009-12-01 | Nikkiso Co Ltd | Isotropic pressure forming device |
| KR20200035805A (en) * | 2018-09-27 | 2020-04-06 | 공석태 | Method of thermoforming a plastic panel using liquid |
| CN112791690A (en) * | 2019-11-13 | 2021-05-14 | 北京晶瓷医疗器械有限公司 | Curing reaction device of composite resin |
| WO2021140532A1 (en) * | 2020-01-08 | 2021-07-15 | Persico S.P.A. | Process for moulding and relative machine for moulding |
| CN113650197A (en) * | 2021-08-16 | 2021-11-16 | 星河动力(北京)空间科技有限公司 | Rubber vulcanization molding device and process method |
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2022
- 2022-04-11 CN CN202210375286.6A patent/CN114714637A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200948601A (en) * | 2008-05-16 | 2009-12-01 | Nikkiso Co Ltd | Isotropic pressure forming device |
| KR20200035805A (en) * | 2018-09-27 | 2020-04-06 | 공석태 | Method of thermoforming a plastic panel using liquid |
| CN112791690A (en) * | 2019-11-13 | 2021-05-14 | 北京晶瓷医疗器械有限公司 | Curing reaction device of composite resin |
| WO2021140532A1 (en) * | 2020-01-08 | 2021-07-15 | Persico S.P.A. | Process for moulding and relative machine for moulding |
| CN113650197A (en) * | 2021-08-16 | 2021-11-16 | 星河动力(北京)空间科技有限公司 | Rubber vulcanization molding device and process method |
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