CN113977908A - Combined screw of double-screw extruder and process for producing low-odor polyolefin - Google Patents
Combined screw of double-screw extruder and process for producing low-odor polyolefin Download PDFInfo
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- CN113977908A CN113977908A CN202111418831.7A CN202111418831A CN113977908A CN 113977908 A CN113977908 A CN 113977908A CN 202111418831 A CN202111418831 A CN 202111418831A CN 113977908 A CN113977908 A CN 113977908A
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- screw
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- machine barrel
- kneading
- vacuum exhaust
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000008569 process Effects 0.000 title claims abstract description 10
- 229920000098 polyolefin Polymers 0.000 title claims abstract description 8
- 238000004898 kneading Methods 0.000 claims abstract description 35
- 239000000463 material Substances 0.000 claims abstract description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 239000004743 Polypropylene Substances 0.000 claims description 7
- -1 polypropylene Polymers 0.000 claims description 7
- 229920001155 polypropylene Polymers 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 239000003963 antioxidant agent Substances 0.000 claims description 4
- 230000003078 antioxidant effect Effects 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 4
- 230000000593 degrading effect Effects 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000011538 cleaning material Substances 0.000 claims description 3
- 238000004332 deodorization Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000013329 compounding Methods 0.000 claims 5
- 239000000155 melt Substances 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract description 13
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000010992 reflux Methods 0.000 description 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- HQKMJHAJHXVSDF-UHFFFAOYSA-L magnesium stearate Chemical compound [Mg+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O HQKMJHAJHXVSDF-UHFFFAOYSA-L 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 150000002978 peroxides Chemical class 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 1
- 235000013539 calcium stearate Nutrition 0.000 description 1
- 239000008116 calcium stearate Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- LSXWFXONGKSEMY-UHFFFAOYSA-N di-tert-butyl peroxide Chemical compound CC(C)(C)OOC(C)(C)C LSXWFXONGKSEMY-UHFFFAOYSA-N 0.000 description 1
- 239000012969 di-tertiary-butyl peroxide Substances 0.000 description 1
- GDVKFRBCXAPAQJ-UHFFFAOYSA-A dialuminum;hexamagnesium;carbonate;hexadecahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Al+3].[Al+3].[O-]C([O-])=O GDVKFRBCXAPAQJ-UHFFFAOYSA-A 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229960001545 hydrotalcite Drugs 0.000 description 1
- 229910001701 hydrotalcite Inorganic materials 0.000 description 1
- 235000019359 magnesium stearate Nutrition 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- 239000003039 volatile agent Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- 235000014692 zinc oxide Nutrition 0.000 description 1
Images
Classifications
-
- 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
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
- B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
-
- 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
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
-
- 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
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
-
- 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
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/68—Barrels or cylinders
- B29C48/682—Barrels or cylinders for twin screws
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The invention relates to a combined screw of a double-screw extruder and a process for producing low-odor polyolefin, which comprises a machine barrel and a screw positioned in the machine barrel, wherein the rear end of the machine barrel is provided with a main material port, the position of the machine barrel, which is close to the front end, is provided with a vacuum exhaust port, and the machine barrel is provided with a natural exhaust port behind the vacuum exhaust port; the screw is provided with a reverse flow element at the rear position close to the vacuum exhaust port, the screw is provided with a kneading element B at the rear position close to the natural exhaust port, and the screw is sequentially provided with a plurality of continuous kneading elements A and a plurality of continuous conveying elements from front to back between the reverse flow element and the kneading element B. The combined screw is simple and easy to operate, the effect of reducing the odor and the volatile matter of a product can be achieved through the arrangement and combination of the threaded elements, the exhaust time of the melt is prolonged, and the melt does not emerge from an exhaust port due to the backpressure, the flow resistance of the melt and the like of the threaded elements; the effect of the volatile matter discharged by the exhaust port is enhanced, and no exhaust port or exhaust equipment is needed to be added, so that the cost is low.
Description
Technical Field
The invention relates to the field of screw extruders, in particular to a combined screw of a double-screw extruder and a process for producing low-odor polyolefin.
Background
The invention discloses a combined screw for a double-screw extruder, which comprises a conveying part, a mixing and compressing part and an extruding part at the upstream side in sequence, wherein a feeding position corresponding to a feeding port of an external extruder is arranged on the conveying part, an exhaust position corresponding to an exhaust port of the external extruder is arranged on the extruding part, and a plurality of screw elements and kneading elements which are arranged in a certain sequence are arranged in a certain distance from the feeding position to the exhaust position along the discharging direction. This patent increases the compression ratio of the compression section by adding a part of the threaded elements of long lead and short pitch, facilitating the negative pressure extraction of the volatiles. The method of increasing the part of the long lead and short pitch screw elements has certain effect on improving the compression ratio of the compression section, but the effect of removing volatile matters from the vacuum devolatilization port positioned in the extrusion section is not ideal, and particularly, the material with high melt index (MFI > 300) prepared by using a peroxide degradation method has high fluidity, contains a lot of volatile matters and has higher requirement on the vacuum devolatilization effect.
Disclosure of Invention
In view of the above, the present invention aims to provide a simple and low-cost twin-screw extruder screw assembly and a process for producing low-odor polyolefin, which can prolong the venting time of the melt and enhance the effect of the vent on the volatile matter.
The invention is realized by adopting the following scheme: a combined screw of a double-screw extruder comprises a machine barrel and a screw positioned in the machine barrel, wherein a main material port is formed in the rear end of the machine barrel, a vacuum exhaust port is formed in the position, close to the front end, of the machine barrel, and a natural exhaust port is formed in the rear of the vacuum exhaust port of the machine barrel; the screw is provided with a reverse flow element at the rear position close to the vacuum exhaust port, the screw is provided with a kneading element B at the rear position close to the natural exhaust port, and a plurality of continuous kneading elements A and a plurality of continuous conveying elements are sequentially arranged on the screw from front to back between the reverse flow element and the kneading element B.
Furthermore, the backflow element is provided with 1 thread layer, the length of the backflow element is 10mm, the helix angle of the backflow element is 67 degrees, and the thread direction is opposite to that of the conveying element.
Further, the length of the kneading element A and the length of the kneading element B are both 30mm, the kneading element A and the kneading element B are both provided with three layers of screw plates, the plane of each screw plate is perpendicular to the axis of the screw, the thickness of each layer of screw plate is 10mm, and the circumferential angle stagger between two adjacent layers of screw plates is 0 degree, 30 degrees, 60 degrees or 90 degrees.
Further, the conveying member has a length of 90mm, a helix angle of 71 °, a number of thread layers of 5 layers and a width of 18mm, or a number of thread layers of 9 layers and a width of 10 mm.
Further, the length-diameter ratio of the screw is 44.
Further, the distance between the vacuum exhaust port and the natural exhaust port is 4-8 times of the diameter of the screw.
The other technical scheme of the invention is as follows:
a process for producing low-odor polyolefin by using a twin-screw extruder with the combined screw comprises the following steps: (1) cleaning material residues on the surface of the screw; (2) setting the temperature of a machine barrel to be 60-280 ℃, setting the rotating speed of a screw to be 150-450 rpm, raising the temperature to the set temperature and preserving the temperature for at least 15 min; (3) adding a polypropylene raw material, a degrading agent and an antioxidant compound agent into a hopper and uniformly mixing; (4) heating properly, extruding the polypropylene melt to clean the interior of the combined screw, cooling to a set temperature after cleaning, and keeping the temperature for at least 15 min; (5) extruding and drawing, cooling under water, and granulating; (6) adjusting proper rotating speed and feeding according to the required deodorization degree and fluidity of a target product, adjusting the load of an extruder and the vacuum degree of a vacuum exhaust port, observing the exhaust states of the vacuum exhaust port and a natural exhaust port, and keeping ventilation, but the molten polymer does not overflow from the exhaust port; (7) sampling and testing the product, and starting to collect the sample after the product has stable properties.
Compared with the prior art, the invention has the following beneficial effects: the combined screw of the double-screw extruder has a simple structure, is simple and easy to implement, can reduce the odor and volatile components of a product by arranging and combining the threaded elements, prolongs the exhaust time of a melt, and prevents the melt from overflowing from an exhaust port due to the backpressure, the flow resistance of the melt and the like of the threaded elements; the effect of the volatile matter discharged by the exhaust port is enhanced, and no exhaust port or exhaust equipment is needed to be added, so that the cost is low.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to specific embodiments and accompanying drawings.
Drawings
FIG. 1 is a cross-sectional view of a combination screw according to an embodiment of the present invention;
FIG. 2 is a side view of a conveying element in an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a transport element in an embodiment of the invention;
FIG. 4 is a side view of the kneading element A or kneading element B in the embodiment of the present invention;
FIG. 5 is a sectional view of the kneading element A or the kneading element B in the embodiment of the present invention;
FIG. 6 is a side view of a reflux unit in an embodiment of the invention;
the reference numbers in the figures illustrate: 100-barrel, 110-main feed port, 120-vacuum vent, 130-natural vent, 200-screw, 210-reverse flow element, 220-kneading element A, 230-conveying element, 240-kneading element B.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As shown in fig. 1 to 6, a combined screw of a twin-screw extruder comprises a cylinder 100 and a screw 200 located in the cylinder, wherein the rear end of the cylinder is provided with a main material port 110, the cylinder is provided with a vacuum exhaust port 120 near the front end, and the cylinder is provided with a natural exhaust port 130 behind the vacuum exhaust port; a reverse flow element is arranged at the rear position of the screw close to the vacuum exhaust port, a kneading element B is arranged at the rear position of the screw close to the natural exhaust port, and a plurality of continuous kneading elements A and a plurality of continuous conveying elements are sequentially arranged on the screw from front to back between the reverse flow element and the kneading element B; conveying elements are adopted on the screw in other parts except the reverse flow element, the kneading element A, the conveying element and the kneading element B, and the conveying elements in other parts can adopt a conventional thread structure and also can adopt the thread structure of the conveying element in the embodiment; the purpose of the above element combination and position setting is to prolong the exhaust time of the melt, and simultaneously the melt does not emerge from the exhaust port due to the backpressure of the thread element, the melt flow resistance and the like; enhancing the effect of volatile matter discharge from the vent, especially for polypropylene with high melt index (MFI > 300) prepared by peroxide degradation; the odor and volatile components of the product can be reduced only by arranging and combining the threaded elements without additionally arranging an exhaust port or exhaust equipment, and the method is simple and easy to implement and low in cost.
In this embodiment, the number of threads of the reflux element 210 is 1, the length is 10mm, the helix angle is 67 °, and the thread direction is opposite to the thread direction of the conveying element; the fluid conveyed to the front end of the vacuum exhaust port is acted by the backflow element, part of the fluid enters the vacuum exhaust section, and the other part of the fluid backflows. On the one hand, the flow rate and the pressure of the fluid at the vacuum exhaust section are reduced, so that the vacuum exhaust port can keep high negative pressure, and the exhaust capacity of the vacuum exhaust port is improved; on the other hand, partial melt backflow can increase the residence time and mixing degree of the melt near a natural exhaust port and a vacuum exhaust port, and volatile gas in the melt can be favorably escaped from the exhaust port.
In the embodiment, the length of the kneading element A220 and the length of the kneading element B240 are both 30mm, the kneading element A and the kneading element B are both provided with three layers of screw plates, the screw plates are in an oval shape, the plane of the screw plates is perpendicular to the axis of the screw, each layer of screw plates is 10mm thick, and the circumferential angles between two adjacent layers of screw plates are staggered by 0 degrees, 30 degrees, 60 degrees or 90 degrees, preferably 60 degrees. The kneading element A behind the reflux element has two functions, namely, the back pressure is established, so that the melt is prevented from being sucked to the vicinity of the vacuum exhaust port due to the negative pressure of the vacuum exhaust port, the efficiency of the natural exhaust port is influenced, and the risk of material overflow of the vacuum exhaust port is increased; secondly, strengthen the palirrhea fuse-element and keep off the mixed effect of palirrhea fuse-element, be favorable to improving degasification effect, reduce the smell of product. The main function of the kneading elements B after the natural gas outlet is to increase the residence time and the degree of mixing of the melt in the vicinity of the natural gas outlet.
In this embodiment, the conveying element 230 has a length of 90mm, a helix angle of 71 °, a thread number of 5 layers and a width of 18mm per layer, or a thread number of 9 layers and a width of 10mm per layer.
In this example, the screw has a length to diameter ratio of 44.
In this example, the barrel consisted of 12 sections, counting from front to back, the first section having an extrusion die, the vacuum vent, natural vent and main port being located in sections 3, 6 and 12 respectively.
In this embodiment, the distance between the vacuum exhaust port and the natural exhaust port is 4 to 8 times the diameter of the screw.
A process for producing low-odor polyolefin by using a twin-screw extruder with the combined screw comprises the following steps: (1) cleaning material residues on the surface of the screw, and ensuring the occlusion of the double screws and the adaptability of the machine barrel and the screw; (2) setting the temperature of a machine barrel to be 60-280 ℃, setting the rotating speed of a screw to be 150-450 rpm, raising the temperature to the set temperature and preserving the temperature for at least 15 min; (3) adding a polypropylene raw material, a degrading agent and an antioxidant compound agent into a hopper and uniformly mixing; (4) heating properly, extruding the polypropylene melt to clean the interior of the combined screw, cooling to a set temperature after cleaning, and keeping the temperature for at least 15 min; (5) extruding and drawing, cooling under water, and granulating; (6) adjusting proper rotating speed and feeding according to the required deodorization degree and fluidity of a target product, adjusting the load of an extruder and the vacuum degree of a vacuum exhaust port, observing the exhaust states of the vacuum exhaust port and a natural exhaust port, and keeping ventilation, but the molten polymer does not overflow from the exhaust port; (7) sampling and testing the product, and starting to collect the sample after the product has stable properties.
In the step (3), three degrading agents, namely 101, 301 and DTBP, are adopted; the antioxidant compound agent is one or more of 3114, 1010, 168, 626, 616, hydrotalcite, calcium stearate, zinc oxide, and magnesium stearate.
Compared with the prior art, the invention has the following technical effects:
the method of the invention is simple, does not need to add an exhaust port or exhaust equipment, can achieve the effect of reducing the odor and the volatile matter of the product only by the arrangement and the combination of the screw elements, is simple and easy to implement and has low cost.
Any embodiment disclosed herein above is meant to disclose, unless otherwise indicated, all numerical ranges disclosed as being preferred, and any person skilled in the art would understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Since the numerical values are too numerous to be exhaustive, some of the numerical values are disclosed in the present invention to illustrate the technical solutions of the present invention, and the above-mentioned numerical values should not be construed as limiting the scope of the present invention.
If the invention discloses or relates to parts or structures which are fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In addition, terms used in any technical solutions disclosed in the present invention to indicate positional relationships or shapes include approximate, similar or approximate states or shapes unless otherwise stated.
Any part provided by the invention can be assembled by a plurality of independent components or can be manufactured by an integral forming process.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (7)
1. A combined screw of a double-screw extruder is characterized in that: the automatic feeding device comprises a machine barrel and a screw rod positioned in the machine barrel, wherein a main material opening is formed in the rear end of the machine barrel, a vacuum exhaust opening is formed in the position, close to the front end, of the machine barrel, and a natural exhaust opening is formed in the rear of the vacuum exhaust opening of the machine barrel; the screw is provided with a reverse flow element at the rear position close to the vacuum exhaust port, the screw is provided with a kneading element B at the rear position close to the natural exhaust port, and a plurality of continuous kneading elements A and a plurality of continuous conveying elements are sequentially arranged on the screw from front to back between the reverse flow element and the kneading element B.
2. The twin-screw extruder compounding screw of claim 1, wherein: the number of the thread layers of the backflow element is 1, the length of the backflow element is 10mm, the helix angle of the backflow element is 67 degrees, and the thread direction is opposite to that of the conveying element.
3. The twin-screw extruder compounding screw of claim 1, wherein: the length of the kneading element A and the length of the kneading element B are both 30mm, the kneading element A and the kneading element B are both provided with three layers of screw plates, the plane of each screw plate is perpendicular to the axis of the screw, the thickness of each layer of screw plate is 10mm, and the circumferential angle stagger between the two adjacent layers of screw plates is 0 degree, 30 degrees, 60 degrees or 90 degrees.
4. The twin-screw extruder compounding screw of claim 1, wherein: the conveying element has a length of 90mm, a helix angle of 71 °, a number of thread layers of 5 layers and a width of 18mm each, or a number of thread layers of 9 layers and a width of 10mm each.
5. The twin-screw extruder compounding screw of claim 1, wherein: the length to diameter ratio of the screw was 44.
6. The twin-screw extruder compounding screw of claim 1, wherein: the distance between the vacuum exhaust port and the natural exhaust port is 4-8 times of the diameter of the screw.
7. A process for producing low odor polyolefins using a twin screw extruder having any of the combination screws of claims 1-6, characterized in that: the method comprises the following steps: (1) cleaning material residues on the surface of the screw; (2) setting the temperature of a machine barrel to be 60-280 ℃, setting the rotating speed of a screw to be 150-450 rpm, raising the temperature to the set temperature and preserving the temperature for at least 15 min; (3) adding a polypropylene raw material, a degrading agent and an antioxidant compound agent into a hopper and uniformly mixing; (4) heating properly, extruding the polypropylene melt to clean the interior of the combined screw, cooling to a set temperature after cleaning, and keeping the temperature for at least 15 min; (5) extruding and drawing, cooling under water, and granulating; (6) adjusting proper rotating speed and feeding according to the required deodorization degree and fluidity of a target product, adjusting the load of an extruder and the vacuum degree of a vacuum exhaust port, observing the exhaust states of the vacuum exhaust port and a natural exhaust port, and keeping ventilation, but the molten polymer does not overflow from the exhaust port; (7) sampling and testing the product, and starting to collect the sample after the product has stable properties.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111418831.7A CN113977908A (en) | 2021-11-26 | 2021-11-26 | Combined screw of double-screw extruder and process for producing low-odor polyolefin |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111418831.7A CN113977908A (en) | 2021-11-26 | 2021-11-26 | Combined screw of double-screw extruder and process for producing low-odor polyolefin |
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| CN113977908A true CN113977908A (en) | 2022-01-28 |
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| WO2017179584A1 (en) * | 2016-04-15 | 2017-10-19 | 住友化学株式会社 | Method for manufacturing resin composition and biaxial kneading and extruding machine |
| CN207808439U (en) * | 2017-11-30 | 2018-09-04 | 大韩道恩高分子材料(上海)有限公司 | A kind of double screw extruder of high CTI flame-retardant PA 66s |
| CN109291404A (en) * | 2018-09-07 | 2019-02-01 | 青岛国恩科技股份有限公司 | For nylon and the combination of the twin-screw of glass fibre extrusion processing and its processing method |
| CN113561447A (en) * | 2021-07-23 | 2021-10-29 | 南京科亚化工成套装备有限公司 | Double-screw extruder for producing special material for MIT needleless injector shell |
| CN217531814U (en) * | 2021-11-26 | 2022-10-04 | 中化泉州能源科技有限责任公司 | Combined screw of double-screw extruder |
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2021
- 2021-11-26 CN CN202111418831.7A patent/CN113977908A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| BE830318A (en) * | 1974-06-19 | 1975-12-17 | MODIFIED POLYOLEFINS PRODUCTION PROCESS | |
| CN2866108Y (en) * | 2006-03-02 | 2007-02-07 | 徐凌秀 | Wood and plastic composite material extrusion moulding machine |
| CN204687319U (en) * | 2015-05-22 | 2015-10-07 | 奉化市旭日新材料有限公司 | A kind of screw combinations for the production of high-performance refractory filled composite materials |
| WO2017179584A1 (en) * | 2016-04-15 | 2017-10-19 | 住友化学株式会社 | Method for manufacturing resin composition and biaxial kneading and extruding machine |
| CN207808439U (en) * | 2017-11-30 | 2018-09-04 | 大韩道恩高分子材料(上海)有限公司 | A kind of double screw extruder of high CTI flame-retardant PA 66s |
| CN109291404A (en) * | 2018-09-07 | 2019-02-01 | 青岛国恩科技股份有限公司 | For nylon and the combination of the twin-screw of glass fibre extrusion processing and its processing method |
| CN113561447A (en) * | 2021-07-23 | 2021-10-29 | 南京科亚化工成套装备有限公司 | Double-screw extruder for producing special material for MIT needleless injector shell |
| CN217531814U (en) * | 2021-11-26 | 2022-10-04 | 中化泉州能源科技有限责任公司 | Combined screw of double-screw extruder |
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