CN114800917A - Equipment for coating nano carbon black layer on surface of polymer and using method thereof - Google Patents
Equipment for coating nano carbon black layer on surface of polymer and using method thereof Download PDFInfo
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- CN114800917A CN114800917A CN202210336546.9A CN202210336546A CN114800917A CN 114800917 A CN114800917 A CN 114800917A CN 202210336546 A CN202210336546 A CN 202210336546A CN 114800917 A CN114800917 A CN 114800917A
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- 229920000642 polymer Polymers 0.000 title claims abstract description 112
- 229910021392 nanocarbon Inorganic materials 0.000 title claims abstract description 64
- 239000006229 carbon black Substances 0.000 title claims abstract description 60
- 239000011248 coating agent Substances 0.000 title claims abstract description 30
- 238000000576 coating method Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000003756 stirring Methods 0.000 claims abstract description 131
- 239000000843 powder Substances 0.000 claims abstract description 128
- 238000002156 mixing Methods 0.000 claims abstract description 111
- 230000007246 mechanism Effects 0.000 claims abstract description 79
- 238000010438 heat treatment Methods 0.000 claims abstract description 34
- 239000011812 mixed powder Substances 0.000 claims description 33
- 230000009477 glass transition Effects 0.000 claims description 26
- 239000004094 surface-active agent Substances 0.000 claims description 19
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 9
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 238000004898 kneading Methods 0.000 claims description 5
- 235000021355 Stearic acid Nutrition 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical group CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 3
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 3
- 239000008117 stearic acid Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 abstract description 41
- 230000009471 action Effects 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- 239000000654 additive Substances 0.000 description 5
- 230000000996 additive effect Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
- B29B7/06—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices
- B29B7/10—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary
- B29B7/18—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with more than one shaft
- B29B7/20—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
- B29B7/22—Component parts, details or accessories; Auxiliary operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/80—Component parts, details or accessories; Auxiliary operations
- B29B7/82—Heating or cooling
- B29B7/826—Apparatus therefor
-
- 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
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/307—Handling of material to be used in additive manufacturing
- B29C64/314—Preparation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
- B33Y40/10—Pre-treatment
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The invention relates to equipment for coating a nano carbon black layer on the surface of a polymer and a using method thereof. The device comprises a mixing cavity and a pressurizing mechanism, wherein a spiral stirring mechanism for stirring is arranged in the mixing cavity, a heating device is arranged in the mixing cavity, a mixing cavity opening is formed in the mixing cavity, the pressurizing mechanism comprises a pressurizing block and a pressurizing driving device, the pressurizing block is arranged above the mixing cavity opening and corresponds to the mixing cavity opening, the pressurizing driving device is in driving connection with the pressurizing block, and the pressurizing driving device can drive the pressurizing block to reciprocate up and down at the mixing cavity opening. Compared with the prior art, under the combined action of the spiral stirring mechanism, the pressurizing driving device and the heating device, the nano carbon black powder particles are effectively and uniformly attached and wrapped on the polymer powder particles to form a nano carbon black layer, and the attachment rate of the nano carbon black powder particles on the surfaces of the polymer powder particles is improved.
Description
Technical Field
The invention belongs to the technical field of additive manufacturing of polymer materials, and particularly relates to equipment for coating a nano carbon black layer on the surface of a polymer and a using method thereof.
Background
Additive Manufacturing (Additive Manufacturing) is an advanced Manufacturing process, does not need expensive dies and saves time consumption of the die Manufacturing process, can realize the advantage of digital Manufacturing, and is very prospective. Among them, the way to additive manufacture with polymer powder as a powder bed process has become a major commercial operating mode for many equipment manufacturers. However, most of the polymer powders are transparent or light color, so that the aggregation of many polymer powders is mostly white, and thus easily reflects the heat source from the additive manufacturing equipment, especially the non-contact heat radiation heat source, and further, the carbon black powder which easily absorbs heat radiation must be added on the surface of the polymer powder to solve the problem of low heat absorption efficiency of the polymer powder.
In the prior art, polymer powder and carbon black powder are stirred and mixed by a stirring barrel, so that carbon black particles are attached to the surfaces of the polymer particles. However, the above method has a low adhesion rate of carbon black particles, and it is not possible to ensure that the carbon black particles are uniformly adhered to the surface of the polymer particles.
Therefore, a technical solution for making the carbon black particles adhere uniformly and with high adhesion rate on the surface of the polymer particles is needed.
Disclosure of Invention
One of the objects of the present invention is: aiming at the defects of the prior art, the invention provides equipment for coating a nano carbon black layer on the surface of a polymer, so as to solve the problems that the adhesion rate of carbon black particles on the surface of polymer particles is low and the carbon black particles can not be ensured to be uniformly adhered on the surface of the polymer particles in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the equipment for coating the nano carbon black layer on the surface of the polymer comprises a mixing cavity and a pressurizing mechanism, wherein a spiral stirring mechanism for stirring is arranged in the mixing cavity, a heating device is arranged in the mixing cavity, a mixing cavity opening is formed in the mixing cavity, the pressurizing mechanism comprises a pressurizing block and a pressurizing driving device, the pressurizing block is arranged above the mixing cavity opening and corresponds to the mixing cavity opening, the pressurizing driving device is in driving connection with the pressurizing block, and the pressurizing driving device can drive the pressurizing block to do up-and-down reciprocating motion at the mixing cavity opening.
As a preferable embodiment of the apparatus for coating a nanocarbon black layer on a polymer surface according to the present invention, the helical stirring mechanism includes two main helical rotors and one auxiliary helical rotor, the diameter of the main helical rotor is larger than that of the auxiliary helical rotor, the two main helical rotors are arranged side by side, the rotation directions of the two main helical rotors are opposite, and the auxiliary helical rotor is arranged below the space between the two main helical rotors.
As a preferable scheme of the equipment for coating the nanocarbon black layer on the surface of the polymer, the heating device is a heating pipe, and the heating pipe is arranged inside the cavity wall of the mixing cavity.
As a preferable scheme of the apparatus for coating the nanocarbon black layer on the polymer surface according to the present invention, the bottom surface of the pressurizing block has an inward concave portion which is inwardly curved.
In a preferred embodiment of the apparatus for coating a nanocarbon black layer on a polymer surface according to the present invention, an exhaust gap is provided between an outer peripheral surface of the pressurizing block and an inner peripheral surface of the kneading chamber opening.
In a preferred embodiment of the apparatus for coating a nanocarbon black layer on a polymer surface according to the present invention, the mixing chamber has a U-shaped cross section with an upward opening and a downward recess at the bottom.
One of the purposes of the invention has the following beneficial effects: according to the invention, the spiral stirring mechanism is arranged in the mixing cavity, so that the polymer powder, the surfactant and the nano carbon black powder can be fully stirred in the mixing cavity; meanwhile, the invention is also provided with a pressurizing mechanism, the pressurizing block is driven by the pressurizing driving device, and the polymer powder, the surfactant and the nano carbon black powder can be kneaded and extruded by the pressurizing block in the mixing cavity; in addition, the heating device is arranged in the mixing cavity, so that the internal temperature of the mixing cavity can be increased; finally, under the combined action of the spiral stirring mechanism, the pressurizing driving device and the heating device, the nano carbon black powder particles are effectively and uniformly attached and wrapped on the polymer powder particles to form a nano carbon black layer, so that the attachment rate of the nano carbon black powder particles on the surfaces of the polymer powder particles is improved.
The second purpose of the invention is: aiming at the defects of the prior art, the invention provides a using method of equipment for coating a nano carbon black layer on the surface of a polymer.
In order to achieve the purpose, the invention adopts the following technical scheme:
the use method of the device for coating the polymer surface with the nano-carbon black layer comprises the following steps:
s100, adding polymer powder into a mixing cavity, starting a spiral stirring mechanism, and stirring the polymer powder; meanwhile, starting a heating device, and heating and keeping the temperature inside the mixing cavity to be 100-105 ℃; wherein the time is 10-20 minutes, and the stirring speed of the spiral stirring mechanism is 5-8 RPM;
s200, stirring the polymer powder by the spiral stirring mechanism; meanwhile, the heating device heats the temperature inside the mixing cavity to 85-95% of the glass transition temperature of the polymer powder; wherein the stirring speed of the spiral stirring mechanism is 5-8 RPM;
s300, adding a surfactant and nano carbon black powder into the mixing cavity, and stirring the mixture and the polymer powder together through the spiral stirring mechanism to form mixed powder; meanwhile, the temperature in the mixing cavity is kept to be 85-95% of the glass transition temperature of the polymer powder; wherein the time is 10-20 minutes, and the stirring speed of the spiral stirring mechanism is 5-8 RPM;
s400, starting a pressurizing driving device, and enabling a pressurizing block to reciprocate up and down at the position of the mixing cavity so as to enable the pressurizing block to extrude the mixed powder; simultaneously, the spiral stirring mechanism stirs the mixed powder; and maintaining the temperature inside the mixing cavity to be 85-95% of the glass transition temperature of the polymer powder; wherein the time is 40-60 minutes, the stirring speed of the spiral stirring mechanism is 10-15 RPM, the pressurizing pressure of the pressurizing block is 1.5-2 MPa, and the reciprocating frequency of the pressurizing block is 1-3 SPM;
s500, turning off the heating device and the pressurizing driving device; meanwhile, the spiral stirring mechanism stirs the mixed powder until the temperature in the mixing cavity is cooled to 60 ℃ or below 60 ℃, and then the spiral stirring mechanism is closed to stop stirring; wherein the stirring speed of the spiral stirring mechanism is 8-12 RPM;
s600, taking the mixed powder out of the mixing cavity to obtain the polymer powder with the surface coated with the nano carbon black layer.
As a preferable scheme of the use method of the equipment for coating the nanocarbon black layer on the surface of the polymer, S400, starting a pressurizing driving device, and enabling a pressurizing block to reciprocate up and down at the opening of the mixing cavity so as to enable the pressurizing block to extrude the mixed powder; simultaneously, the spiral stirring mechanism stirs the mixed powder; and maintaining the temperature inside the mixing cavity to be 85-95% of the glass transition temperature of the polymer powder; the time is 40-60 minutes, the stirring speed of the spiral stirring mechanism is 10-15 RPM, the pressurizing pressure of the pressurizing block is 1.5-2 MPa, and the reciprocating frequency of the pressurizing block is 1-3 SPM, and the method comprises the following steps:
s410, starting a pressurizing driving device, and enabling a pressurizing block to reciprocate up and down at the position of the mixing cavity so as to enable the pressurizing block to extrude the mixed powder; simultaneously, the spiral stirring mechanism stirs the mixed powder; and maintaining the temperature inside the mixing cavity to be 85-95% of the glass transition temperature of the polymer powder; wherein the time is 15-25 minutes, the stirring speed of the spiral stirring mechanism is 10-15 RPM, the pressurizing pressure of the pressurizing block is 1.5-2 MPa, and the reciprocating frequency of the pressurizing block is 1 SPM;
s420, the pressurizing block reciprocates up and down at the position of the mixing cavity so as to enable the pressurizing block to extrude the mixed powder; simultaneously, the spiral stirring mechanism stirs the mixed powder; and maintaining the temperature inside the mixing cavity to be 85-95% of the glass transition temperature of the polymer powder; the time is 25-35 minutes, the stirring speed of the spiral stirring mechanism is 10-15 RPM, the pressurizing pressure of the pressurizing block is 1.5-2 MPa, and the reciprocating frequency of the pressurizing block is 2-3 SPM.
As a preferable embodiment of the method for using the apparatus for coating the nanocarbon black layer on the polymer surface according to the present invention, the polymer powder is TPU powder, TPR powder, ABS powder, POM powder, PA11 powder, and/or PA12 powder.
As a preferable scheme of the use method of the device for coating the nanocarbon black layer on the surface of the polymer, the surfactant is stearic acid and/or ethylene glycol.
The second object of the invention has the following beneficial effects: according to the invention, the spiral stirring mechanism is arranged in the mixing cavity, so that the polymer powder, the surfactant and the nano carbon black powder can be fully stirred in the mixing cavity; meanwhile, the invention is also provided with a pressurizing mechanism, the pressurizing block is driven by the pressurizing driving device, and the polymer powder, the surfactant and the nano carbon black powder can be kneaded and extruded by the pressurizing block in the mixing cavity; in addition, the heating device is arranged in the mixing cavity, so that the internal temperature of the mixing cavity can be increased; finally, under the combined action of the spiral stirring mechanism, the pressurizing driving device and the heating device, the nano carbon black powder particles are effectively and uniformly attached and wrapped on the polymer powder particles to form a nano carbon black layer, so that the attachment rate of the nano carbon black powder particles on the surfaces of the polymer powder particles is improved.
Drawings
Fig. 1 is a schematic view of the apparatus of the present invention.
FIG. 2 is a view showing a structure of a state of polymer powder particles.
Fig. 3 is an image of polymer (PA12) powder particles coated with a nanocarbon black layer shown under a Scanning Electron Microscope (SEM).
In the figure: 1-mixing cavity; 11-a spiral stirring mechanism; 111-main screw rotor; 112-secondary helical rotor; 12-a heating device; 2-a pressurizing mechanism; 21-pressing blocks; 211-an inner recess; 22-a pressurized drive; 3-exhaust gap.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the present invention and its advantages will be described in further detail below with reference to the following detailed description and the accompanying drawings, but the embodiments of the present invention are not limited thereto.
Example 1
As shown in fig. 1 to 3, the apparatus for coating a nanocarbon black layer on a polymer surface comprises a mixing cavity 1 and a pressurizing mechanism 2, wherein a spiral stirring mechanism 11 for stirring is arranged inside the mixing cavity 1, a heating device 12 is arranged inside the mixing cavity 1, a mixing cavity opening is arranged on the mixing cavity 1, the pressurizing mechanism 2 comprises a pressurizing block 21 and a pressurizing driving device 22, the pressurizing block 21 is arranged above the mixing cavity opening and is arranged corresponding to the mixing cavity opening, the pressurizing driving device 22 is in driving connection with the pressurizing block 21, the pressurizing driving device 22 can drive the pressurizing block 21 to reciprocate up and down at the mixing cavity opening, and the pressurizing driving device 22 is a servo cylinder.
The embodiment has the beneficial effects that: in the embodiment, the spiral stirring mechanism 11 is arranged in the mixing cavity 1, so that the polymer powder, the surfactant and the nano carbon black powder can be fully stirred in the mixing cavity 1; meanwhile, the embodiment is also provided with a pressurizing mechanism 2, the polymer powder, the surfactant and the nano carbon black powder can be kneaded and extruded by the pressurizing block 21 in the mixing cavity 1 under the driving of the pressurizing driving device 22 by the pressurizing block 21; in addition, in the embodiment, the heating device 12 is further arranged inside the mixing cavity 1, so that the internal temperature of the mixing cavity 1 can be improved; finally, in the present embodiment, under the combined action of the spiral stirring mechanism 11, the pressurization driving device 22 and the heating device 12, the nano carbon black powder particles are effectively and uniformly attached and wrapped on the polymer powder particles to form a nano carbon black layer, so that the attachment rate of the nano carbon black powder particles on the surface of the polymer powder particles is improved.
Preferably, the helical stirring mechanism 11 includes two main helical rotors 111 and one auxiliary helical rotor 112, the diameter of the main helical rotor 111 is larger than that of the auxiliary helical rotor 112, the two main helical rotors 111 are arranged side by side, the rotation directions of the two main helical rotors 111 are opposite, the two main helical rotors 111 have stirring blades and the stirring blades of the two main helical rotors 111 have a phase difference, the two main helical rotors 111 do not interfere with each other and collide when rotating simultaneously, and the auxiliary helical rotor 112 is arranged below between the two main helical rotors 111. With the above arrangement, the two main screw rotors 111 are used for stirring most of the material powder (polymer powder, surfactant and/or nano carbon black powder) inside the kneading chamber 1; the auxiliary screw rotor 112 is actually located at the dead point position of the two main screw rotors 111, the rotation of the auxiliary screw rotor 112 can prevent part of material powder from accumulating at the dead point position of the two main screw rotors 111, the stirring efficiency of the material powder in the mixing cavity 1 is improved, and the improvement of the adhesion rate of the nano carbon black powder particles on the surfaces of the polymer powder particles is facilitated.
Preferably, the heating device 12 is a heating pipe, and the heating pipe is arranged inside the cavity wall of the mixing cavity 1. According to the actual situation, a proper setting form is selected.
Preferably, the bottom surface of the pressurizing block 21 has an inward concave portion 211 inwardly curved. Through the setting, add briquetting 21 when descending to mixing accent export extrusion, the inside material powder of mixing cavity 1 can be smooth through interior concave part 211, and then avoids adding briquetting 21 and blocks up and hinder the material powder at the inside stirring of mixing cavity 1, has improved the stirring efficiency of material powder at mixing cavity 1 inside, is favorable to improving the adhesion rate of nanometer carbon black powder granule on polymer powder granule surface.
Preferably, an exhaust gap 3 is provided between the outer peripheral surface of the pressurizing block 21 and the inner peripheral surface of the kneading chamber opening. Through the arrangement, the gas in the mixing cavity 1 can be discharged through the exhaust gap 3, and the phenomenon that the polymer powder in the mixing cavity 1 is suddenly gasified to cause dust raising is avoided.
Preferably, the cross-sectional shape of the kneading chamber 1 in the vertical direction is a U-shape having an upward opening and a downward recess at the bottom. According to the actual situation, a proper mixing cavity 1 is selected.
Example 2
As shown in fig. 1 to 3, the method for using the apparatus for coating a nanocarbon black layer on a polymer surface, using the apparatus for coating a nanocarbon black layer on a polymer surface according to any one of the above embodiments 1, includes:
s100, adding polymer powder into the mixing cavity 1, starting the spiral stirring mechanism 11, and stirring the polymer powder; meanwhile, starting the heating device 12, and heating and maintaining the temperature inside the mixing cavity 1 to 100-105 ℃, and more preferably to 105 ℃; wherein, the time is 10 to 20 minutes, more preferably 15 minutes, and the stirring speed of the spiral stirring mechanism 11 is 5 to 8 RPM. With the above arrangement, the polymer powder is deprived of moisture by preheating.
S200, stirring polymer powder by using a spiral stirring mechanism 11; meanwhile, the heating device 12 heats the temperature inside the mixing cavity 1 to 85-95% of the glass transition temperature of the polymer powder, and more preferably 90% of the glass transition temperature; wherein the stirring speed of the spiral stirring mechanism 11 is 5-8 RPM. The polymer powder will remain in the powder state when the polymer is at a temperature below the glass transition temperature point.
S300, adding a surfactant and nano carbon black powder into the mixing cavity 1, and stirring the mixture and the polymer powder together through a spiral stirring mechanism 11 to form mixed powder; meanwhile, the temperature in the mixing cavity 1 is kept to be 85-95% of the glass transition temperature of the polymer powder, and more preferably 90% of the glass transition temperature; wherein, the time is 10-20 minutes, more preferably 10 minutes, and the stirring speed of the spiral stirring mechanism 11 is 5-8 RPM. When the surface active agent is at 85-95% of glass transition temperature, the surface active agent with the melting point lower than that of the polymer can be uniformly spread on the surface of the polymer powder particles, the surface active agent can fill up uneven depressions on the surface of the polymer with very thin thickness and form a continuous film-shaped substance, so that the nano carbon black powder particles can be attached and coated on the surface of the polymer powder particles in the subsequent pressurizing and stirring process.
S400, starting the pressurizing driving device 22, and enabling the pressurizing block 21 to reciprocate up and down at the position of the mixing cavity so that the pressurizing block 21 extrudes mixed powder; meanwhile, the spiral stirring mechanism 11 stirs the mixed powder; the temperature in the mixing cavity 1 is kept to be 85-95% of the glass transition temperature of the polymer powder, and more preferably 90% of the glass transition temperature; wherein the time is 40-60 minutes, the stirring speed of the spiral stirring mechanism 11 is 10-15 RPM, the pressurizing pressure of the pressurizing block 21 is 1.5-2 MPa, and the reciprocating frequency of the pressurizing block 21 is 1-3 SPM. With the pressurization and the stirring, the polymer powder particles continuously roll and rub with each other, so that the nano carbon black powder particles are only attached and coated on the surfaces of the polymer powder particles in a layer form.
S500, closing the heating device 12 and the pressurizing driving device 22; meanwhile, the spiral stirring mechanism 11 stirs the mixed powder until the temperature inside the mixing cavity 1 is cooled to 60 ℃ or below 60 ℃, and then the spiral stirring mechanism 11 is closed to stop stirring; wherein the stirring speed of the spiral stirring mechanism 11 is 8-12 RPM.
S600, taking the mixed powder out of the mixing cavity 1 to obtain the polymer powder with the surface coated with the nano carbon black layer.
The embodiment has the beneficial effects that: in the embodiment, the spiral stirring mechanism 11 is arranged in the mixing cavity 1, so that the polymer powder, the surfactant and the nano carbon black powder can be fully stirred in the mixing cavity 1; meanwhile, the embodiment is also provided with a pressurizing mechanism 2, the polymer powder, the surfactant and the nano carbon black powder can be kneaded and extruded by the pressurizing block 21 in the mixing cavity 1 under the driving of the pressurizing driving device 22 by the pressurizing block 21; in addition, in the embodiment, the heating device 12 is further arranged inside the mixing cavity 1, so that the internal temperature of the mixing cavity 1 can be improved; finally, in the present embodiment, under the combined action of the spiral stirring mechanism 11, the pressurization driving device 22 and the heating device 12, the nano carbon black powder particles are effectively and uniformly attached and wrapped on the polymer powder particles to form a nano carbon black layer, so that the attachment rate of the nano carbon black powder particles on the surface of the polymer powder particles is improved.
Preferably, S400, the pressurizing driving device 22 is started, and the pressurizing block 21 reciprocates up and down at the mixing cavity so that the pressurizing block 21 extrudes the mixed powder; meanwhile, the spiral stirring mechanism 11 stirs the mixed powder; the temperature in the mixing cavity 1 is kept to be 85-95% of the glass transition temperature of the polymer powder, and more preferably 90% of the glass transition temperature; wherein, the time is 40-60 minutes, the stirring speed of the spiral stirring mechanism 11 is 10-15 RPM, the pressurizing pressure of the pressurizing block 21 is 1.5-2 MPa, and the reciprocating frequency of the pressurizing block 21 is 1-3 SPM, and the method comprises the following steps:
s410, starting the pressurizing driving device 22, and enabling the pressurizing block 21 to reciprocate up and down at the position of the mixing cavity so as to enable the pressurizing block 21 to extrude mixed powder; meanwhile, the spiral stirring mechanism 11 stirs the mixed powder; the temperature in the mixing cavity 1 is kept to be 85-95% of the glass transition temperature of the polymer powder, and more preferably 90% of the glass transition temperature; wherein the time is 15 to 25 minutes, more preferably 20 minutes, the stirring speed of the spiral stirring mechanism 11 is 10 to 15RPM, the pressurizing pressure of the pressurizing block 21 is 1.5 to 2MPa, and the reciprocating frequency of the pressurizing block 21 is 1 SPM.
S420, the pressurizing block 21 reciprocates up and down at the position of the mixing cavity so that the pressurizing block 21 extrudes mixed powder; meanwhile, the spiral stirring mechanism 11 stirs the mixed powder; the temperature in the mixing cavity 1 is kept to be 85-95% of the glass transition temperature of the polymer powder, and more preferably 90% of the glass transition temperature; wherein, the time is 25 to 35 minutes, more preferably 30 minutes, the stirring speed of the spiral stirring mechanism 11 is 10 to 15RPM, the pressurizing pressure of the pressurizing block 21 is 1.5 to 2MPa, and the reciprocating frequency of the pressurizing block 21 is 2 to 3SPM, more preferably 3 SPM.
Preferably, the polymer powder is TPU powder, TPR powder, ABS powder, POM powder, PA11 powder and/or PA12 powder, and the size of the polymer powder is 13-55 mu m. According to the actual situation, a suitable polymer powder is selected.
Preferably, the surfactant is stearic acid and/or ethylene glycol. The surfactant is selected as appropriate according to the actual situation.
Variations and modifications to the above-described embodiments may become apparent to those skilled in the art to which the invention pertains based upon the disclosure and teachings of the above specification. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. The equipment for coating the nano carbon black layer on the surface of the polymer is characterized in that: including mixing cavity (1) and loading system (2), mixing cavity (1) inside is provided with spiral rabbling mechanism (11) that are used for the stirring, mixing cavity (1) inside is provided with heating device (12), mixing cavity (1) is provided with the mixing accent on it, loading system (2) are including adding briquetting (21) and pressurization drive arrangement (22), add briquetting (21) and set up mixing accent top and with mixing accent corresponds the setting, pressurization drive arrangement (22) with add briquetting (21) drive connection, pressurization drive arrangement (22) can drive add briquetting (21) are in mixing accent department is reciprocating motion from top to bottom.
2. The apparatus for coating the polymer surface with the nano-carbon black layer according to claim 1, wherein: the spiral stirring mechanism (11) comprises two main spiral rotors (111) and one auxiliary spiral rotor (112), the diameter of the main spiral rotor (111) is larger than that of the auxiliary spiral rotor (112), the main spiral rotors (111) are arranged side by side, the rotating directions of the main spiral rotors (111) are opposite, and the auxiliary spiral rotor (112) is arranged below the main spiral rotors (111).
3. The apparatus for coating the polymer surface with the nano-carbon black layer according to claim 1, wherein: the heating device (12) is a heating pipe, and the heating pipe is arranged inside the cavity wall of the mixing cavity (1).
4. The apparatus for coating the polymer surface with the nano-carbon black layer according to claim 1, wherein: the bottom surface of the pressurizing block (21) is provided with an inward concave part (211) which is inwards concave in a radian manner.
5. The apparatus for coating the polymer surface with the nano-carbon black layer according to claim 1, wherein: an exhaust gap (3) is provided between the outer peripheral surface of the pressurizing block (21) and the inner peripheral surface of the kneading chamber opening.
6. The apparatus for coating nano carbon black layer on the surface of polymer according to claim 1, wherein: the cross section of the mixing cavity (1) in the vertical direction is in a U shape with an upward opening and a downward concave bottom.
7. The use method of the device for coating the polymer surface with the nano-carbon black layer is characterized in that the device for coating the polymer surface with the nano-carbon black layer as claimed in any one of claims 1 to 6 is used, and comprises the following steps:
s100, adding polymer powder into a mixing cavity (1), starting a spiral stirring mechanism (11), and stirring the polymer powder; meanwhile, starting a heating device (12) to heat the interior of the mixing cavity (1) to 100-105 ℃; wherein the time is 10-20 minutes, and the stirring speed of the spiral stirring mechanism (11) is 5-8 RPM;
s200, stirring the polymer powder by the spiral stirring mechanism (11); meanwhile, the heating device (12) heats the temperature inside the mixing cavity (1) to 85-95% of the glass transition temperature of the polymer powder; wherein the stirring speed of the spiral stirring mechanism (11) is 5-8 RPM;
s300, adding a surfactant and nano carbon black powder into the mixing cavity (1) and stirring the mixture and the polymer powder together through the spiral stirring mechanism (11) to form mixed powder; meanwhile, the temperature in the mixing cavity (1) is kept to be 85-95% of the glass transition temperature of the polymer powder; wherein the time is 10-20 minutes, and the stirring speed of the spiral stirring mechanism (11) is 5-8 RPM;
s400, starting a pressurizing driving device (22), and enabling a pressurizing block (21) to reciprocate up and down at the position of the mixing cavity so as to enable the pressurizing block (21) to extrude the mixed powder; simultaneously, the spiral stirring mechanism (11) stirs the mixed powder; and the temperature in the mixing cavity (1) is kept to be 85-95% of the glass transition temperature of the polymer powder; wherein the time is 40-60 minutes, the stirring speed of the spiral stirring mechanism (11) is 10-15 RPM, the pressurizing pressure of the pressurizing block (21) is 1.5-2 MPa, and the reciprocating frequency of the pressurizing block (21) is 1-3 SPM;
s500, turning off the heating device (12) and the pressurization driving device (22); meanwhile, the spiral stirring mechanism (11) stirs the mixed powder until the temperature in the mixing cavity (1) is cooled to 60 ℃ or below 60 ℃, and then the spiral stirring mechanism (11) is closed to stop stirring; wherein the stirring speed of the spiral stirring mechanism (11) is 8-12 RPM;
s600, taking the mixed powder out of the mixing cavity (1) to obtain polymer powder with the surface coated with the nano carbon black layer.
8. The use method of the apparatus for coating the nanocarbon black layer on the surface of the polymer according to claim 7, wherein S400, a pressurizing driving device (22) is started, and a pressurizing block (21) reciprocates up and down at the mixing cavity so that the pressurizing block (21) extrudes the mixed powder; simultaneously, the spiral stirring mechanism (11) stirs the mixed powder; and the temperature in the mixing cavity (1) is kept to be 85-95% of the glass transition temperature of the polymer powder; wherein, the time is 40-60 minutes, the stirring speed of the spiral stirring mechanism (11) is 10-15 RPM, the pressurizing pressure of the pressurizing block (21) is 1.5-2 Mpa, the reciprocating frequency of the pressurizing block (21) is 1-3 SPM, and the method comprises the following steps:
s410, starting a pressurizing driving device (22), and enabling a pressurizing block (21) to reciprocate up and down at the position of the mixing cavity so as to enable the pressurizing block (21) to extrude the mixed powder; simultaneously, the spiral stirring mechanism (11) stirs the mixed powder; and the temperature in the mixing cavity (1) is kept to be 85-95% of the glass transition temperature of the polymer powder; wherein the time is 15-25 minutes, the stirring speed of the spiral stirring mechanism (11) is 10-15 RPM, the pressurizing pressure of the pressurizing block (21) is 1.5-2 MPa, and the reciprocating frequency of the pressurizing block (21) is 1 SPM;
s420, the pressurizing block (21) reciprocates up and down at the mixing cavity so that the pressurizing block (21) extrudes the mixed powder; simultaneously, the spiral stirring mechanism (11) stirs the mixed powder; and the temperature in the mixing cavity (1) is kept to be 85-95% of the glass transition temperature of the polymer powder; the time is 25-35 minutes, the stirring speed of the spiral stirring mechanism (11) is 10-15 RPM, the pressurizing pressure of the pressurizing block (21) is 1.5-2 MPa, and the reciprocating frequency of the pressurizing block (21) is 2-3 SPM.
9. The use method of the device for coating the nano-carbon black layer on the surface of the polymer according to claim 7, is characterized in that: the polymer powder is TPU powder, TPR powder, ABS powder, POM powder, PA11 powder and/or PA12 powder.
10. The use method of the device for coating the nano-carbon black layer on the surface of the polymer according to claim 7, is characterized in that: the surfactant is stearic acid and/or ethylene glycol.
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