CN113524611B - Devolatilization process for SMA product production - Google Patents
Devolatilization process for SMA product production Download PDFInfo
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- CN113524611B CN113524611B CN202110807815.0A CN202110807815A CN113524611B CN 113524611 B CN113524611 B CN 113524611B CN 202110807815 A CN202110807815 A CN 202110807815A CN 113524611 B CN113524611 B CN 113524611B
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/025—General arrangement or layout of plant
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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
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/10—Conditioning or physical treatment of the material to be shaped by grinding, e.g. by triturating; by sieving; by filtering
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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
- B29B7/002—Methods
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/793—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling upstream of the plasticising zone, e.g. heating in the hopper
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
- B29C48/802—Heating
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a devolatilization process for SMA product production, which comprises mixing, preheating, extruding, filtering and devolatilization treatment of SMA, and relates to the technical field of chemical production. The preheating mechanism is arranged at the bottom of the extrusion mechanism, and the SMA in the preheating pipe is preheated by using hot oil in the preheating pipe barrel, so that the temperature difference between the SMA and the inside of the machine barrel can be reduced, the danger of local overheating of an SMA molecular chain is further effectively avoided, and the SMA obtaining rate is ensured; in addition, the heat conduction pipe is arranged in the machine barrel, hot oil passing through the preheating pipe barrel enters the heat conduction pipe, the SMA at the middle part of the machine barrel is heated by the heat conduction pipe, meanwhile, the machine barrel is kept at a certain temperature by the electric heating sleeve arranged on the surface of the machine barrel, the heating effect of the SMA at the middle part of the machine barrel is improved by the heat conduction pipe, the problem that the monomer is not easy to escape due to uneven heating of the SMA is avoided, and the devolatilization effect of the SMA is effectively improved.
Description
Technical Field
The invention belongs to the technical field of chemical production, and particularly relates to a devolatilization process for SMA product production.
Background
Styrene-maleic anhydride copolymer (SMA) is prepared through bulk copolymerization of styrene and maleic anhydride. In the reaction process, if the conversion rate of the styrene monomer exceeds 90%, a copolymer resin with good transparency and thermal stability cannot be obtained, and if the conversion rate of the monomer is less than 40%, more monomer remains in the polymerization system, so that the contradiction between the processing devolatilization and the overload of solvent recovery engineering is caused. For this reason, it is common in industry to control the conversion of styrene monomer to more than 60%, even if 40% of styrene monomer remains in the system, which must be removed and recovered by devolatilization.
In the prior art, a devolatilization process of a copolymer containing styrene-maleic anhydride is proposed in a Chinese patent CN1056623C, in the scheme, a double-shaft screw devolatilization extruder with a plurality of exhaust ports and special screw blocks is adopted, the temperature and pressure of each exhaust port are regulated, so that the vacuum degree of each exhaust port is matched with the temperature of the material of the corresponding port, and further, a copolymerization system containing high styrene residual monomers is simply separated; however, in the process of extruding the SMA in the extruder, the SMA in the middle of the extruder has poor heating effect, so that monomers in the SMA in the middle part are not easy to escape as an outer layer during devolatilization, thereby reducing the devolatilization effect.
Disclosure of Invention
The invention aims to provide a devolatilization process for producing an SMA product, which solves the problems in the prior art.
The aim of the invention can be achieved by the following technical scheme:
a devolatilization process for SMA product production comprising the steps of:
step one, introducing SMA into a mixing mechanism to perform static mixing treatment at a flow rate of 0.9-1.2m/s, wherein the pipe diameter of static mixing is 400-450mm;
step two, introducing the SMA subjected to mixed treatment into a preheating mechanism, wherein the flow speed of the SMA in the preheating mechanism is 1.5-1.8m/s, the retention time of the SMA in the preheating mechanism is 8-12s, and introducing hot oil at 220-250 ℃ into the preheating mechanism to preheat the SMA;
thirdly, introducing the preheated SMA into the extrusion mechanism, controlling the temperature in the extrusion mechanism to be 250-270 ℃, arranging a heating element in the middle of the extrusion mechanism, heating the SMA in the extrusion mechanism to be in a molten state, and extruding the SMA, wherein the residence time of the SMA in the extrusion mechanism is 6-10s;
and fourthly, sending the extruded SMA into a filter material mechanism for filtering treatment, wherein the filter material mechanism is used for filtering the SMA with the diameter of 2-3 mu m, finally leading the filtered SMA into a devolatilization mechanism, setting the vacuum degree in the devolatilization mechanism to be 3.22kPa, setting the temperature of the devolatilization mechanism to be 260 ℃, finishing the devolatilization treatment of the SMA in the devolatilization mechanism, and collecting the gas generated in the devolatilization treatment by using a centrifugal fan.
As a further proposal of the invention, the preheating treatment is carried out on the SMA, so that the temperature difference of the SMA when the SMA enters the extrusion mechanism is reduced.
As a further scheme of the invention, after the devolatilization treatment is completed, the SMA is retained for 20-25 seconds in an environment with the temperature of 220-240 ℃.
As a further scheme of the invention, the integrated devolatilization system comprises a mixing tank, a processing tank and a volatilizing tank, wherein the mixing tank, the processing tank and the volatilizing tank are arranged side by side.
As a further scheme of the invention, a mixing mechanism is arranged in the mixing tank, the mixing mechanism comprises a static mixer, the static mixer is positioned in the mixing tank, a feeding pipe is arranged at the top of the mixing tank, the bottom end of the feeding pipe penetrates through the mixing tank and is communicated with the interior of the static mixer, a first material guiding pipe is arranged at the bottom of the static mixer, and one end of the first material guiding pipe penetrates through the mixing tank and the treatment tank and extends to the interior of the treatment tank.
As a further scheme of the invention, an extrusion mechanism and a preheating mechanism are respectively arranged in the treatment tank, the preheating mechanism comprises a preheating sleeve, the preheating sleeve is positioned below the inside of the treatment tank, a vacuum pumping pump I is arranged below the inside of the treatment tank, a feeding end of the vacuum pumping pump I is communicated with one end of a material guiding pipe I, a discharging end of the vacuum pumping pump I is communicated with a preheating pipe, one end of the preheating pipe extends to the inside of the preheating sleeve, a plurality of heat conducting fins are arranged on the surface of the preheating pipe, an oil inlet pipe is arranged below one side of the treatment tank, and one end of the oil inlet pipe penetrates through the treatment tank and is connected with one end of the preheating sleeve.
As a further scheme of the invention, the extrusion mechanism comprises a machine barrel, the machine barrel is positioned in the treatment tank, one end of the preheating pipe is communicated with the interior of the machine barrel, a heat conduction pipe is arranged in the machine barrel, an extrusion spiral frame is arranged on the surface of the heat conduction pipe, a servo motor is arranged at the bottom end of the machine barrel, a driving gear is arranged on the surface of an output shaft of the servo motor, a driven gear is arranged on the surface of the heat conduction pipe below the interior of the machine barrel, the tooth surface of the driven gear is meshed with the tooth surface of the driving gear, the bottom end of the heat conduction pipe is connected with the top end of the preheating sleeve, an oil outlet pipe is communicated with the top end of the heat conduction pipe, one end of the oil outlet pipe penetrates through the machine barrel and the treatment tank and extends to the exterior of the treatment tank, a rotating frame is arranged at the top of the driven gear, the top of the rotating frame extends to the interior of the machine barrel, a sealing ring is fixedly connected with the bottom of the extrusion spiral frame, sealing rings are arranged between the surfaces of the driven gear and the heat conduction pipe, and the sealing rings are also arranged between the peripheral surface of the rotating frame and the interior of the machine barrel.
As a further scheme of the invention, an electric heating sleeve is arranged on the surface of the machine barrel, an electric heating wire is arranged in the electric heating sleeve, and the top end of the machine barrel is communicated with a second material guiding pipe.
As a further scheme of the invention, the top of the volatilizing tank is provided with a filter material mechanism, the filter material mechanism comprises a filter material frame, the bottom of the filter material frame is fixedly connected with the top of the volatilizing tank, one side of the filter material frame is provided with a vacuum pumping pump II, the feeding end of the vacuum pumping pump II is communicated with one end of a material guiding pipe II, the discharging end of the vacuum pumping pump II is communicated with the inside of the filter material frame through a guide pipe, a filter plate is arranged in the filter material frame, a filter hole is formed in the filter plate, and the bottom of the filter material frame is communicated with a material guiding pipe III.
As a further scheme of the invention, a devolatilizing mechanism is arranged in the volatilizing tank, the devolatilizing mechanism comprises a discharging frame positioned at the top of the volatilizing tank, a plurality of spraying heads are arranged at the bottom of the discharging frame, the inside of each spraying head is communicated with the inside of the discharging frame, spraying holes with the aperture of 1-2 mu m are formed in the inside of each spraying head, SMA is sprayed out in a micro bead shape through each spraying head, the bottom end of each spraying head extends to the inside of the volatilizing tank, the inside of each discharging frame is communicated with the bottom end of a material guiding pipe III, an exhaust pipe is communicated with the upper side of the inside of the volatilizing tank, a discharging pipe is communicated with the lower side of the inside of the volatilizing tank, a vacuum pump is arranged on one side of the volatilizing tank, and the output end of the vacuum pump is communicated with the inside of the volatilizing tank through a vacuum pipe.
The invention has the beneficial effects that:
the preheating mechanism is arranged at the bottom of the extrusion mechanism, and the SMA in the preheating pipe is preheated by using hot oil in the preheating pipe barrel, so that when the SMA enters the machine barrel, the temperature difference between the SMA and the inside of the machine barrel can be reduced, the local overheating danger of an SMA molecular chain is further effectively avoided, and the SMA obtaining rate is ensured; in addition, the heat conducting pipe is arranged in the machine barrel, hot oil passing through the preheating pipe barrel enters the heat conducting pipe, the SMA positioned in the middle of the machine barrel is heated by the heat conducting pipe, meanwhile, the machine barrel is kept at a certain temperature by the aid of the electric heating sleeve arranged on the surface of the machine barrel, the SMA in the machine barrel is spirally extruded by the extrusion spiral frame, the heating effect of the SMA in the middle of the machine barrel is improved by the heat conducting pipe, the problem that monomers are not easy to escape due to uneven heating of the SMA is avoided, and the devolatilization effect of the SMA is effectively improved; after the extruded SMA is treated by a filter material, the SMA is sent into the inside of the volatilization tank, colloid in the SMA is filtered by utilizing a filter plate, the blockage of a spraying head in the devolatilization mechanism is avoided, the spraying head is used for spraying the SMA in the form of micro beads, the sprayed SMA is subjected to vacuum removal in the inside of the volatilization tank, so that monomers in the SMA are gasified and escape, the device of the whole devolatilization process is reasonable in structural design, the devolatilization treatment of the SMA can be efficiently completed by utilizing the mutual cooperation among all mechanisms, and after the devolatilization treatment of the SMA is completed, the SMA is retained for 25 seconds in the environment of 240 ℃, so that thermal crosslinking can be caused between SMA molecular chains, the particle shape of the SMA is stabilized, and the obtaining quality of an SMA product is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the structure of an integrated devolatilization system of the present invention;
FIG. 2 is a cross-sectional view of the structure of the mixing tank of the present invention;
FIG. 3 is a cross-sectional view of the treatment tank structure of the present invention;
FIG. 4 is an enlarged view of the structure of FIG. 3A in accordance with the present invention;
FIG. 5 is a cross-sectional view of a filter frame structure of the present invention;
fig. 6 is a cross-sectional view of the structure of the vaporization tank of the present invention.
In the drawings, the list of components represented by the various numbers is as follows:
10. a mixing tank; 20. a treatment tank; 30. a volatilization tank; 11. a static mixer; 12. a feed pipe; 13. a first material guide pipe; 21. preheating the sleeve; 22. a vacuum pumping pump I; 23. a preheating tube; 24. a heat conductive sheet; 25. an oil inlet pipe; 31. a barrel; 32. a heat conduction pipe; 33. extruding a spiral frame; 34. a servo motor; 35. a drive gear; 36. a driven gear; 37. an oil outlet pipe; 38. a rotating frame; 39. an electric heating sleeve; 310. a second material guide pipe; 41. a filter material frame; 42. a vacuum pumping pump II; 43. a filter plate; 44. a material guide pipe III; 51. a discharging frame; 52. a spray head; 53. an exhaust pipe; 54. a discharge pipe; 55. and a vacuum pump.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-6, the present invention is a devolatilization process for SMA product production, comprising the steps of:
step one, introducing SMA into a mixing mechanism to perform static mixing treatment at a flow rate of 0.9-1.2m/s, wherein the pipe diameter of static mixing is 400-450mm;
step two, introducing the SMA subjected to mixed treatment into a preheating mechanism, wherein the flow speed of the SMA in the preheating mechanism is 1.5-1.8m/s, the retention time of the SMA in the preheating mechanism is 8-12s, and introducing hot oil at 220-250 ℃ into the preheating mechanism to preheat the SMA;
thirdly, introducing the preheated SMA into the extrusion mechanism, controlling the temperature in the extrusion mechanism to be 250-270 ℃, arranging a heating element in the middle of the extrusion mechanism, heating the SMA in the extrusion mechanism to be in a molten state, and extruding the SMA, wherein the residence time of the SMA in the extrusion mechanism is 6-10s;
and fourthly, sending the extruded SMA into a filter material mechanism for filtering treatment, wherein the filter material mechanism is used for filtering the SMA with the diameter of 2-3 mu m, finally leading the filtered SMA into a devolatilization mechanism, setting the vacuum degree in the devolatilization mechanism to be 3.22kPa, setting the temperature of the devolatilization mechanism to be 260 ℃, finishing the devolatilization treatment of the SMA in the devolatilization mechanism, and collecting the gas generated in the devolatilization treatment by using a centrifugal fan.
The devolatilization process for producing the SMA product relates to an integrated devolatilization system, wherein the integrated devolatilization system comprises a mixing tank 10, a treatment tank 20 and a volatilization tank 30, and the mixing tank 10, the treatment tank 20 and the volatilization tank 30 are arranged side by side;
the mixing device is characterized in that a mixing mechanism is arranged in the mixing tank 10 and comprises a static mixer 11, the static mixer 11 is positioned in the mixing tank 10, a feeding pipe 12 is arranged at the top of the mixing tank 10, the bottom end of the feeding pipe 12 penetrates through the mixing tank 10 and is communicated with the interior of the static mixer 11, a first material guide pipe 13 is arranged at the bottom of the static mixer 11, and one end of the first material guide pipe 13 penetrates through the mixing tank 10 and the processing tank 20 and extends to the interior of the processing tank 20;
the inside of the treatment tank 20 is respectively provided with an extrusion mechanism and a preheating mechanism, the preheating mechanism comprises a preheating sleeve 21, the preheating sleeve 21 is positioned below the inside of the treatment tank 20, a first vacuum pumping pump 22 is arranged below the inside of the treatment tank 20, the feeding end of the first vacuum pumping pump 22 is communicated with one end of a first material guiding pipe 13, the discharging end of the first vacuum pumping pump 22 is communicated with a preheating pipe 23, one end of the preheating pipe 23 extends to the inside of the preheating sleeve 21, the surface of the preheating pipe 23 is provided with a plurality of heat conducting fins 24, an oil inlet pipe 25 is arranged below one side of the treatment tank 20, and one end of the oil inlet pipe 25 penetrates through the treatment tank 20 and is connected with one end of the preheating sleeve 21;
the extrusion mechanism comprises a machine barrel 31, the machine barrel 31 is positioned in the treatment tank 20, one end of a preheating pipe 23 is communicated with the interior of the machine barrel 31, a heat conducting pipe 32 is arranged in the machine barrel 31, an oil outlet pipe 37 is communicated with the top end of the heat conducting pipe 32, one end of the oil outlet pipe 37 penetrates through the machine barrel 31 and the treatment tank 20 and extends to the outside of the treatment tank 20, SMA in the machine barrel 31 is pushed into the interior of a second guide pipe 310, a servo motor 34 is arranged at the bottom end of the machine barrel 31, a driving gear 35 is arranged on the surface of an output shaft of the servo motor 34, a driven gear 36 is arranged below the interior of the machine barrel 31 and positioned on the surface of the heat conducting pipe 32, the tooth surface of the driven gear 36 is meshed with the tooth surface of the driving gear 35, the bottom end of the heat conducting pipe 32 is connected with the top end of the preheating sleeve 21, an oil outlet pipe 37 is communicated with the top end of the heat conducting pipe 32, one end of the oil outlet pipe 37 penetrates through the machine barrel 31 and the treatment tank 20 and extends to the outside of the treatment tank 20, the top of the rotating frame 38 extends to the interior of the machine barrel 31, the top of the rotating frame 38 is fixedly connected with the bottom of the extrusion screw frame 33, the driven gear 36 is fixedly arranged on the bottom of the rotating frame 36, the surface of the driven gear 36 is arranged on the rotating frame 38, the sealing ring is arranged between the inner surface of the rotating frame 38 and the cylinder barrel 31 and the inner peripheral surface of the heat conducting pipe 31;
an electric heating sleeve 39 is arranged on the surface of the machine barrel 31, an electric heating wire is arranged in the electric heating sleeve 39, the machine barrel 31 is heated to 260 ℃ by the electric heating wire, and the top end of the machine barrel 31 is communicated with a second material guide pipe 310;
the top of the volatilizing pot 30 is provided with a filter material mechanism, the filter material mechanism comprises a filter material frame 41, the bottom of the filter material frame 41 is fixedly connected with the top of the volatilizing pot 30, one side of the filter material frame 41 is provided with a second vacuum pumping pump 42, the feeding end of the second vacuum pumping pump 42 is communicated with one end of a second material guide pipe 310, the discharging end of the second vacuum pumping pump 42 is communicated with the inside of the filter material frame 41 through a guide pipe, a filter plate 43 is arranged in the filter material frame 41, a filter hole is formed in the filter plate 43, and the bottom of the filter material frame 41 is communicated with a third material guide pipe 44;
the inside of volatilize jar 30 is provided with the devolatilization mechanism, the devolatilization mechanism is including being located the ejection of compact frame 51 at volatilize jar 30 top, the bottom of ejection of compact frame 51 is provided with a plurality of spouting stub bar 52, and the inside of spouting stub bar 52 communicates with the inside of ejection of compact frame 51, the orifice that the aperture is 1-2 mu m is seted up to the inside of spouting stub bar 52, SMA is through spouting stub bar 52 with the microbead blowout, the bottom of spouting stub bar 52 extends to the inside of volatilize jar 30, the inside of ejection stub bar 51 communicates with the bottom of passage three 44, the top of volatilize jar 30 inside communicates there is exhaust tube 53, the one end intercommunication of exhaust tube 53 has the rectifying tank, and the below through centrifugal fan cooperation exhaust tube 53 will escape gas suction rectifying tank's inside, and the inside intercommunication of volatilize jar 30 has discharging tube 54, one side of volatilize jar 30 is provided with vacuum pump 55, and the output of vacuum pump 55 communicates with the inside of volatilize jar 30 through the vacuum tube.
And all that is not described in detail in this specification is well known to those skilled in the art.
The working principle of the invention is as follows:
when in use, SMA is fed into the static mixer 11 in the mixing tank 10 through the feed pipe 12, and after the SMA is mixed in the static mixer 11, the SMA is pumped into the treatment tank 20 through the first vacuum pump 22;
SMA enters the preheating pipe 23 through the first vacuum pumping pump 22, hot oil is introduced into the preheating sleeve 21 through the oil inlet pipe 25, flows into the heat conducting pipe 32 in the preheating sleeve 21, finally circularly flows through the oil outlet pipe 37, heats the machine barrel 31 through the electric heating sleeve 39 on the surface of the machine barrel 31, after the SMA in the preheating pipe 23 is preheated through the preheating sleeve 21, flows into the machine barrel 31, the driving gear 35 on the surface of the output shaft of the servo motor 34 drives the driven gear 36 arranged on the surface of the heat conducting pipe 32 to rotate, the driven gear 36 drives the rotating frame 38 to rotate in the machine barrel 31, the extrusion spiral frame 33 on the top of the rotating frame 38 carries out spiral extrusion on the SMA in the machine barrel 31, and the SMA in the middle of the machine barrel 31 is heated through the heat conducting pipe 32;
the SMA extruded from the inside of barrel 31 is pumped into the filter material frame 41 through the vacuum pump II 42, the SMA is filtered through the filter holes in the filter plate 43, the filtered SMA enters the discharging frame 51 through the material guide pipe III 44, the vacuum degree in the volatilizing tank 30 is controlled to be 3.22kPa through the vacuum pump 55, the temperature in the volatilizing tank 30 is set to be 260 ℃, the SMA is sprayed into the volatilizing tank 30 through the spray head 52, the SMA in the SMA is gasified and escapes, the escaped gas is pumped out through the air exhaust pipe 53 and then subjected to rectification treatment, and meanwhile the fallen SMA is collected through the discharging pipe 54, so that devolatilization treatment on the production of an SMA product is completed.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely illustrative and explanatory of the principles of the invention, as various modifications and additions may be made to the specific embodiments described, or similar thereto, by those skilled in the art, without departing from the principles of the invention or beyond the scope of the appended claims.
Claims (7)
1. A devolatilization process for SMA product production, characterized by: the method comprises the following steps:
step one, introducing SMA into a mixing mechanism for static mixing treatment;
step two, introducing the SMA subjected to the mixed treatment into a preheating mechanism, introducing hot oil into the preheating mechanism, and preheating the SMA;
thirdly, introducing the preheated SMA into the extrusion mechanism, and extruding the SMA after heating the SMA to a molten state in the extrusion mechanism;
step four, the extruded SMA is sent into a filter material mechanism for filtering treatment, finally the filtered SMA is sent into a devolatilization mechanism, the SMA completes devolatilization treatment in the devolatilization mechanism, and a centrifugal fan is used for collecting gas generated in the devolatilization treatment;
in the second step, the flow speed of the SMA in the preheating mechanism is 1.5-1.8m/s, the retention time of the SMA in the preheating mechanism is 8-12s, and the temperature of hot oil is 220-250 ℃;
controlling the temperature in the extrusion mechanism to be 250-270 ℃, arranging a heating element in the middle of the extrusion mechanism, and controlling the residence time of SMA in the extrusion mechanism to be 6-10s;
and fourthly, after the devolatilization treatment is completed, the SMA is retained for 20 to 25 seconds in an environment with the temperature of 220 to 240 ℃.
2. A devolatilization process as claimed in claim 1 for SMA product production, wherein: in the first step, the flow rate of the static mixing of the SMA is 0.9-1.2m/s, and the pipe diameter of the static mixing is 400-450mm.
3. A devolatilization process as claimed in claim 1 for SMA product production, wherein: and thirdly, preheating the SMA to reduce the temperature difference of the SMA when the SMA enters the extrusion mechanism.
4. A devolatilization process as claimed in claim 1 for SMA product production, wherein: in the fourth step, the filter diameter of the filter material mechanism for SMA is 2-3 μm.
5. A devolatilization process as claimed in claim 1 for SMA product production, wherein: in the fourth step, the vacuum degree in the devolatilizer was set to 3.22kPa, and the temperature of the devolatilizer was set to 260 ℃.
6. A devolatilization process as claimed in claim 1 for SMA product production, wherein: the working methods of the preheating mechanism and the extrusion mechanism are as follows:
SMA gets into preheating tube (23) inside, lets in hot oil to preheating tube (21) inside, hot oil flows to the inside of heat pipe (32) in preheating tube (21) inside, electric jacket (39) on barrel (31) surface heats barrel (31), preheating tube (23) inside SMA carries out preheating treatment by the hot oil in preheating tube (21), SMA flows into the inside of barrel (31), extrude spiral frame (33) and carry out spiral extrusion to the SMA inside barrel (31), SMA in barrel (31) middle part carries out continuous heating through heat pipe (32), accomplish preheating and extrusion to SMA.
7. A devolatilization process as claimed in claim 1 for SMA product production, wherein: the working method of the filter material mechanism and the devolatilization mechanism is as follows:
the SMA is pumped into the filter material frame (41), the SMA is filtered through the filter holes in the filter plate (43), then the SMA enters the discharge frame (51), the vacuum degree in the volatilization tank (30) is controlled to be 3.22kPa through the vacuum pump (55), the temperature in the volatilization tank (30) is set to be 260 ℃, the SMA is sprayed into the volatilization tank (30) through the spray head (52), the SMA is gasified and escaped in the SMA, the escaped gas is pumped out by the air extraction pipe (53) and then subjected to rectification treatment, and meanwhile, the fallen SMA is collected through the discharge pipe (54), so that devolatilization treatment on the production of the SMA product is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110807815.0A CN113524611B (en) | 2021-07-16 | 2021-07-16 | Devolatilization process for SMA product production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110807815.0A CN113524611B (en) | 2021-07-16 | 2021-07-16 | Devolatilization process for SMA product production |
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| US6211331B1 (en) * | 1999-09-09 | 2001-04-03 | Nova Chemicals Europe Limited | Polymer devolatilization apparatus |
| CN102046664A (en) * | 2008-07-08 | 2011-05-04 | 东丽株式会社 | Method for manufacturing thermoplastic copolymers |
| JP2011132426A (en) * | 2009-12-25 | 2011-07-07 | Toray Ind Inc | Method for producing rubber-reinforced thermoplastic resin composition |
| CA3025192A1 (en) * | 2016-06-22 | 2017-12-28 | Performance Biofilaments Inc. | Surface-modified cellulosic materials and methods of producing the same |
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| US5540813A (en) * | 1994-01-19 | 1996-07-30 | Fina Technology, Inc. | Method for reducing volatiles in polymerized styrene |
| DE69813711T2 (en) * | 1997-09-30 | 2004-02-26 | Mitsui Chemicals, Inc. | Process for removing volatiles from a polymer composition |
| FR2827868A1 (en) * | 2001-07-30 | 2003-01-31 | Bp Chem Int Ltd | Continuous production of styrene polymers, e.g. high-impact polystyrene, involves bulk polymerisation followed by two-stage devolatilisation of the melt in a special system to remove unreacted monomer and oligomers |
| CN100335557C (en) * | 2003-09-19 | 2007-09-05 | 奇美实业股份有限公司 | Transparent rubber modified polyphenylethylene series resin |
| US20200346368A1 (en) * | 2017-12-27 | 2020-11-05 | Versalis S.P.A. | Circuit and process for managing transients in a plant for continuous mass production of granulated expandable polymers |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6211331B1 (en) * | 1999-09-09 | 2001-04-03 | Nova Chemicals Europe Limited | Polymer devolatilization apparatus |
| CN102046664A (en) * | 2008-07-08 | 2011-05-04 | 东丽株式会社 | Method for manufacturing thermoplastic copolymers |
| JP2011132426A (en) * | 2009-12-25 | 2011-07-07 | Toray Ind Inc | Method for producing rubber-reinforced thermoplastic resin composition |
| CA3025192A1 (en) * | 2016-06-22 | 2017-12-28 | Performance Biofilaments Inc. | Surface-modified cellulosic materials and methods of producing the same |
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