CN220681570U - Double-screw combined structure and extruder - Google Patents
Double-screw combined structure and extruder Download PDFInfo
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- CN220681570U CN220681570U CN202322407079.7U CN202322407079U CN220681570U CN 220681570 U CN220681570 U CN 220681570U CN 202322407079 U CN202322407079 U CN 202322407079U CN 220681570 U CN220681570 U CN 220681570U
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- 238000004898 kneading Methods 0.000 claims abstract description 97
- 239000000463 material Substances 0.000 claims abstract description 84
- 238000002844 melting Methods 0.000 claims abstract description 30
- 230000008018 melting Effects 0.000 claims abstract description 30
- 238000010008 shearing Methods 0.000 claims abstract description 28
- 239000006185 dispersion Substances 0.000 claims abstract description 27
- 230000006835 compression Effects 0.000 claims abstract description 22
- 238000007906 compression Methods 0.000 claims abstract description 22
- 239000002131 composite material Substances 0.000 claims abstract description 20
- 239000000126 substance Substances 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000002861 polymer material Substances 0.000 abstract description 13
- 239000002245 particle Substances 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 4
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 19
- 239000004926 polymethyl methacrylate Substances 0.000 description 19
- 230000005540 biological transmission Effects 0.000 description 18
- 229920002877 acrylic styrene acrylonitrile Polymers 0.000 description 17
- 238000002156 mixing Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 8
- 239000002994 raw material Substances 0.000 description 8
- 238000001125 extrusion Methods 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 239000003963 antioxidant agent Substances 0.000 description 3
- 230000003078 antioxidant effect Effects 0.000 description 3
- 239000004595 color masterbatch Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000011236 particulate material Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- -1 propylene triester Chemical class 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229920001897 terpolymer Polymers 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
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- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The present disclosure provides a twin-screw integrated configuration and extruder, the twin-screw integrated configuration includes: a barrel including a first end and a second end; two meshed screw rod combined structures are arranged in the cylinder body, and the screw rod combined structures comprise: a first conveying section; a compression section connected with the first conveying section; the pre-plasticizing section is connected with the compression section and is used for shearing plasticizing materials; the second conveying section is used for extruding the pre-plasticized material; a dispersion kneading section for shearing and dispersing the material extruded by the second conveying section; a melting section for melting the material; the vacuum exhaust section is used for exhausting moisture and micromolecular substances; wherein the length of the second conveying section is greater than the lengths of the pre-plasticizing section and the dispersion kneading section. The method reduces the combined shearing capacity of the screw, so that the surface of the material strip of the composite high polymer material is smooth, and the inside of the particles is compact.
Description
Technical Field
The disclosure relates to the technical field of extrusion equipment, and in particular relates to a double-screw combined structure and an extruder.
Background
Polymethyl methacrylate (polymethyl methacrylate, PMMA), also known as acrylic or organic glass, has excellent physical and chemical properties such as high mechanical strength, low density, high light transmittance, good weather resistance and the like, and is increasingly widely applied to the fields of construction, illumination, automobiles and the like. ASA plastic is a terpolymer of three monomers, namely acrylonitrile (A), propylene triester rubber (B) and styrene (S), has the advantages of good mechanical property, weather resistance, static resistance and the like, and is widely applied to the fields of machinery, automobiles, electronic appliances and the like. Therefore, PMMA and ASA are compounded to obtain the polymer material with more excellent performance.
Compounding of PMMA with ASA is typically accomplished by melt extrusion using a twin screw extruder. The double screw extruder relies on the pressure and shearing force generated by screw rotation, so that the materials can be fully plasticized and uniformly mixed. The screw combination in the double screw extruder mainly uses a conveying screw element and a shearing screw element for combination, and the reasonable screw combination plays a vital role in preparing PMMA and ASA composite high polymer materials. But the PMMA and ASA composite polymer is not provided with a specially-adapted screw extruder at present, and is produced by a double screw extruder which is arranged conventionally, but the existing screw has stronger combined shearing force, so that the PMMA and ASA composite polymer material has rough surface and hollow interior and lower material performance.
Disclosure of Invention
The present disclosure provides a twin screw combined structure and extruder to address at least the above technical problems in the prior art.
According to a first aspect of the present disclosure, there is provided a twin screw combined structure comprising:
a barrel including a first end and a second end; two meshed screw rod combined structures are arranged in the cylinder body, and the screw rod combined structures sequentially comprise, along the direction from the first end to the second end:
the first conveying section is arranged in the cylinder and is used for conveying materials;
the compression section is arranged in the cylinder body and connected with the first conveying section and is used for compressing materials so as to densify the materials;
the pre-plasticizing section is arranged in the cylinder and connected with the compression section and is used for shearing plasticizing materials;
the second conveying section is arranged in the cylinder body and connected with the pre-plasticizing section and used for extruding the pre-plasticized material;
the dispersing and kneading section is arranged in the cylinder body and connected with the second conveying section and is used for shearing and dispersing the materials extruded by the second conveying section;
the melting section is arranged in the cylinder and connected with the dispersion kneading section and is used for melting materials;
the vacuum exhaust section is arranged in the cylinder and connected with the melting section and is used for exhausting water and micromolecular substances;
wherein the length of the second conveying section is greater than the lengths of the pre-plasticizing section and the dispersion kneading section.
In one embodiment, the lead/length of the first conveying section in its direction of extension is greater than the lead/length of the compression section in its direction of extension.
In one embodiment, the first conveying section has a lead/length in the direction of extension of 32/32sk,48/48, 48/48; or (b)
The lead/length of the first conveying section in the extending direction thereof is 32/32sk,48/48, 48/48, 48/48, respectively.
In one embodiment, the lead/length of the compression section in the direction of extension thereof is 32/32, 32/32, 32/32, 32/32, 32/32, respectively.
In one embodiment, the kneading blocks of the pre-plasticizing section are arranged in the direction of their extent at a kneading disc stagger angle/kneading disc number/total length of 30 °/7/48, 45 °/5/32, 45 °/5/32, 45 °/5/32, respectively; the pre-plasticizing section also includes a threaded element having a lead/length of 22/11L.
In one embodiment, the second conveying section has a lead/length in the direction of its extension of 48/48, 48/48, 48/48, 32/32, respectively.
In an embodiment, the second conveying section further comprises threaded elements of lead/length 22/22, respectively.
In one embodiment, the kneading blocks of the dispersion kneading block are arranged in the direction of extension thereof at a kneading disc stagger angle/kneading disc number/total length of 45 °/5/32, respectively.
In one embodiment, the dispersion kneading block further comprises kneading blocks having kneading disc stagger angles/kneading disc number/total length of 45 °/5/32, 60 °/4/22, respectively.
In one embodiment, the lead/length of the melting section in the direction of extension thereof and the kneading disc stagger angle/kneading disc number/total length of the kneading blocks are 32/32, 32/32, 45 °/5/32, 45 °/5/32, 45 °/5/32, 22/11L, respectively.
In one embodiment, the lead/length of the melting section in the direction of extension thereof and the kneading disc stagger angle/kneading disc number/total length of the kneading blocks are 32/32, 32/32, 45 °/5/32, 45 °/5/32, 90 °/5/32, 22/11L, respectively.
In one embodiment, the vacuum exhaust section has leads/lengths in the extending direction of the vacuum exhaust section of: 48/48, 48/48, 48/48, 32/32, 32/32, 32/32, 22/22, 22/22, 22/22; or (b)
The leads/lengths of the vacuum exhaust section in the extending direction are respectively as follows: 48/48, 48/48, 32/32, 32/32, 22/22, 22/22, 22/22, 22/22.
According to a second aspect of the present disclosure, there is provided an extruder comprising the twin screw combination described above.
The disclosure provides a double-screw combined structure and an extruder, wherein the screw combined structure sequentially comprises a first conveying section, a compression section, a pre-plasticizing section, a second conveying section, a dispersion kneading section, a melting section and a vacuum exhaust section, wherein materials are sheared in the pre-plasticizing section, the dispersion kneading section and the melting section; the second conveying section is arranged between the preplasticizing section and the dispersing kneading section, and the length of the second conveying section is larger than that of the preplasticizing section and the dispersing kneading section, so that the arrangement of the shearing thread elements is sparse, the combined shearing capacity of the screw can be effectively reduced, the surface of the material strip of the composite polymer material is smooth, and the inside of the particles is compact.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the disclosure, nor is it intended to be used to limit the scope of the disclosure. Other features of the present disclosure will become apparent from the following specification.
Drawings
The above, as well as additional purposes, features, and advantages of exemplary embodiments of the present disclosure will become readily apparent from the following detailed description when read in conjunction with the accompanying drawings. Several embodiments of the present disclosure are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings, in which:
in the drawings, the same or corresponding reference numerals indicate the same or corresponding parts.
FIG. 1 is a schematic view showing a twin-screw combined structure provided in embodiment 1 of the present disclosure;
FIG. 2 is a schematic view showing a double screw combined structure provided in embodiment 2 of the present disclosure;
fig. 3 shows a schematic view of a twin-screw combined structure provided in comparative example 1 of the present disclosure.
The reference numerals in the figures illustrate: 1. a cylinder; 101. a feed opening; 102. a vacuum port; 11. a first conveying section; 12. a compression section; 13. a pre-plasticizing section; 14. a second conveying section; 15. a dispersion kneading section; 16. a melting section; 17. a vacuum exhaust section; 21. a first transmission section; 22. a second transmission section; 23. a third plasticizing section; 24. a fourth transmission section; 25. a fifth plasticizing section; 26. a sixth transmission section; 27. a seventh melt blending stage; 28. an eighth transmission section; 29. a ninth melt blending stage; 30. a tenth exhaust section; 301. and an exhaust port.
Detailed Description
In order to make the objects, features and advantages of the present disclosure more comprehensible, the technical solutions in the embodiments of the present disclosure will be clearly described in conjunction with the accompanying drawings in the embodiments of the present disclosure, and it is apparent that the described embodiments are only some embodiments of the present disclosure, but not all embodiments. Based on the embodiments in this disclosure, all other embodiments that a person skilled in the art would obtain without making any inventive effort are within the scope of protection of this disclosure.
Because the existing screw combination has strong shearing capability, the PMMA and ASA composite polymer material has the defects of rough surface and hollow particle inside, and in order to improve the surface smoothness and the particle inside compaction degree of the PMMA and ASA composite polymer material, the following embodiment provides a double screw combination structure.
Example 1
As shown in fig. 1, a double-screw combined structure comprises a barrel 1, wherein the barrel 1 is horizontally arranged and is provided with a first end and a second end, and the extending direction from the first end to the second end is the conveying direction of materials. Wherein the position of barrel 1 near first end is provided with feed opening 101, and feed opening 101 communicates with barrel 1 inside, and the material after the raw and other materials misce bene gets into barrel 1 inside through feed opening 101.
Two meshed screw rod combined structures are arranged in the cylinder body 1, the extending direction of the screw rod combined structures from the first end to the second end sequentially comprises a first conveying section 11, a compression section 12, a preplasticizing section 13, a second conveying section 14, a dispersing and kneading section 15, a melting section 16 and a vacuum exhaust section 17, and the two connected sections are connected end to end. Wherein the first conveying section 11, the compression section 12, the preplasticizing section 13, the second conveying section 14, the dispersion kneading section 15, the melting section 16 and the vacuum exhaust section 17 are all composed of a plurality of screw elements.
With reference to fig. 1, the first conveying flight 11 has a lead/length in its direction of extension of 32/32sk,48/48, 48/48, 48/48, respectively. Wherein 32/32SK is used for connecting with the cylinder body 1, the first conveying section 11 selects a screw thread element with the lead/length of 48/48, and the volume of a screw rod and materials can be increased by arranging the first conveying section 11 with a large lead, so that the materials flow smoothly.
The compression section 12 has a smaller lead/length in its direction of extension than the first conveying section 11, which is arranged to compress the material such that the material is compacted and then enters the pre-plasticizing stage. The lead/length of the compression section 12 in its direction of extension is 32/32, 32/32, 32/32, 32/32, 32/32, respectively.
The pre-plasticizing section 13 comprises a plurality of kneading blocks, and the kneading blocks of the pre-plasticizing section 13 arranged in the extending direction thereof have a kneading disc stagger angle/kneading disc number/total length of 30 °/7/48, 45 °/5/32, 45 °/5/32, 45 °/5/32, respectively.
The preplasticizing part 13 also comprises a screw element with a lead/length of 22/11L. After the materials are extruded by the compression section 12, the materials are conveyed to the preplasticizing section 13 for shearing plasticization, so that the materials can be further mixed and dispersed uniformly, the materials can be extruded compactly, and the gas generated in the heating process is discharged. In addition, the staggered angle of the kneading discs in the embodiment is changed from 30 degrees to 45 degrees, so that the shearing force can be improved, and the materials are more uniformly mixed and dispersed in the pre-plasticizing section 13.
The length of the second conveying section 14 is greater than the length of the preplasticizing section 13, and the lead/length of the second conveying section 14 in its direction of extension is 48/48, 48/48, 48/48, 32/32, 22/22, respectively. The transition of the lead of the second conveying section 14 from large to small can enable the pre-plasticized material to flow smoothly in the front section, the rear section becomes dense after extrusion, and redundant bubbles are discharged.
The length of the dispersion kneading section 15 is smaller than that of the second conveying section 14, and the kneading block kneading disc stagger angle/kneading disc number/total length of the dispersion kneading section 15 in the extending direction thereof is 45 °/5/32, respectively. The shearing of the materials in the dispersing and kneading section 15 can further improve the dispersion degree of each raw material.
The lead/length of the melt section 16 in its extending direction was 32/32, 32/32, 45 °/5/32, 45 °/5/32, 45 °/5/32, 22/11L, respectively, of the kneading disc stagger angle/the kneading disc number/the total length of the kneading blocks. The materials dispersed by the dispersion kneading section 15 are conveyed to the melting section 16, and the materials are conveyed for a certain distance and sheared further, so that compared with continuous shearing, intermittent shearing of the materials can effectively reduce the combined shearing capacity of the screw. In one embodiment, the use of counter-threads for the threaded elements of the melting section 16 can enhance the residence time of the material in the melting section 16 to allow for adequate melt dispersion of the material.
The leads/lengths of the vacuum exhaust section 17 in the extending direction thereof are respectively: 48/48, 48/48, 48/48, 32/32, 32/32, 32/32, 22/22, 22/22, 22/22. Wherein a vacuum port 102 is provided above the cylinder 1 corresponding to the vacuum exhaust section 17. The steam and low molecular substances generated by the material in the cylinder body 1 are exhausted and pumped away through the vacuum port 102, so that the inside of the material is more compact, the material is gradually extruded, and better granulating conditions are achieved.
The application method of the double-screw combined structure in the embodiment 1 in preparing the PMMA and ASA composite polymer material comprises the following steps:
s11, weighing raw materials in parts by weight and 55-80 parts of PMMA resin; 20-35 parts of ASA rubber powder; 0.1-0.5 part of antioxidant; 0.2-1 part of lubricant; 1-5 parts of high-light color master batch;
s12, starting the double-screw combined structure to rotate, adding materials formed by raw materials into a feed opening 101 of the cylinder body 1, and conveying, melting, extruding and cooling the double-screw combined structure to obtain the PMMA and ASA composite polymer material, namely the particle 1.
In the step S12, the temperature of the first conveying section 11 is 180-190 ℃; the temperature of the preplasticizing section 13 is 190-200 ℃; the temperature of the second conveying section 14 is 200-210 ℃; the temperature of the dispersion kneading section 15 is 220-225 ℃; the temperature of the melting section 16 is 225-230 ℃; the temperature of the vacuum exhaust section 17 is 230 ℃; the temperature of the head was 225 ℃.
Example 2
As shown in fig. 2, a double-screw combined structure comprises a barrel 1, wherein the barrel 1 is horizontally arranged and is provided with a first end and a second end, and the extending direction from the first end to the second end is the conveying direction of materials. Wherein the position of barrel 1 near first end is provided with feed opening 101, and feed opening 101 communicates with barrel 1 inside, and the material after the raw and other materials misce bene gets into barrel 1 inside through feed opening 101.
Two meshed screw rod combined structures are arranged in the cylinder body 1, the extending direction of the screw rod combined structures from the first end to the second end sequentially comprises a first conveying section 11, a compression section 12, a preplasticizing section 13, a second conveying section 14, a dispersing and kneading section 15, a melting section 16 and a vacuum exhaust section 17, and the two connected sections are connected end to end. Wherein the first conveying section 11, the compression section 12, the preplasticizing section 13, the second conveying section 14, the dispersion kneading section 15, the melting section 16 and the vacuum exhaust section 17 are all composed of a plurality of screw elements.
With reference to fig. 2, the first conveying flight 11 has a lead/length in its direction of extension of 32/32sk,48/48, 48/48, 48/48, respectively. Wherein 32/32SK is used for being connected with the cylinder body 1, the first conveying section 11 selects screw elements with leads/lengths of 48/48SK and 48/48, and the volume of a screw rod and materials can be increased by arranging the first conveying section 11 with a large lead, so that the materials can flow smoothly. In addition, the front end of the first conveying section 11 uses 48/48SK (wherein SK is a right angle cut on one side of a thread groove), so that the free volume of the thread element of the section can be increased, more materials can be contained, and the conveying effect of the materials is further improved.
The compression section 12 has a smaller lead/length in its direction of extension than the first conveying section 11, which is arranged to compress the material such that the material is compacted and then enters the pre-plasticizing stage. The lead/length of the compression section 12 in its direction of extension is 32/32, 32/32, 32/32, 32/32, 32/32, respectively.
The pre-plasticizing section 13 comprises a plurality of kneading blocks, and the kneading blocks of the pre-plasticizing section 13 arranged in the extending direction thereof have a kneading disc stagger angle/kneading disc number/total length of 30 °/7/48, 45 °/5/32, 45 °/5/32, 45 °/5/32, respectively.
The preplasticizing part 13 also comprises a screw element with a lead/length of 22/11L. After the materials are extruded by the compression section 12, the materials are conveyed to the preplasticizing section 13 for shearing plasticization, so that the materials can be further mixed and dispersed uniformly, the materials can be extruded compactly, and the gas generated in the heating process is discharged. In addition, the staggered angle of the kneading discs in the embodiment is changed from 30 degrees to 45 degrees, so that the shearing force can be improved, and the materials are more uniformly mixed and dispersed in the pre-plasticizing section 13.
The length of the second conveying section 14 is greater than the length of the preplasticizing section 13, and the lead/length of the second conveying section 14 in its direction of extension is 48/48, 48/48, 48/48, 32/32, respectively. The transition of the lead of the second conveying section 14 from large to small can enable the pre-plasticized material to flow smoothly in the front section, the rear section becomes dense after extrusion, and redundant bubbles are discharged.
The length of the dispersion kneading section 15 is smaller than that of the second conveying section 14, and the kneading blocks of the dispersion kneading section 15 arranged in the extending direction thereof have kneading disc stagger angles/kneading disc numbers/total lengths of 45 °/5/32, 45 °/5/32, 45 °/5/32, 60 °/4/22, respectively. The shearing of the materials in the dispersing and kneading section 15 can further improve the dispersion degree of each raw material.
The lead/length of the melt section 16 in its extending direction was 32/32, 32/32, 45 °/5/32, 45 °/5/32, 90 °/5/32, 22/11L, respectively, of the kneading disc stagger angle/the kneading disc number/the total length of the kneading blocks. The materials dispersed by the dispersion kneading section 15 are conveyed to the melting section 16, and the materials are conveyed for a certain distance and sheared further, so that compared with continuous shearing, intermittent shearing of the materials can effectively reduce the combined shearing capacity of the screw. In one embodiment, the use of counter-threads for the threaded elements of the melting section 16 can enhance the residence time of the material in the melting section 16 to allow for adequate melt dispersion of the material.
The leads/lengths of the vacuum exhaust section 17 in the extending direction thereof are respectively: 48/48, 48/48, 32/32, 32/32, 22/22, 22/22, 22/22, 22/22. Wherein a vacuum port 102 is provided above the cylinder 1 corresponding to the vacuum exhaust section 17. The steam and low molecular substances generated by the material in the cylinder body 1 are exhausted and pumped away through the vacuum port 102, so that the inside of the material is more compact, the material is gradually extruded, and better granulating conditions are achieved.
The application method of the double-screw combined structure in the embodiment 2 in preparing the PMMA and ASA composite polymer material comprises the following steps:
s21, weighing 55-80 parts of PMMA resin as raw materials in parts by weight; 20-35 parts of ASA rubber powder; 0.1-0.5 part of antioxidant; 0.2-1 part of lubricant; 1-5 parts of high-light color master batch;
s22, starting the double-screw combined structure to rotate, adding materials formed by raw materials into a feed opening 101 of the cylinder body 1, and conveying, melting, extruding and cooling the double-screw combined structure to obtain the PMMA and ASA composite polymer material, which is marked as particles 2.
In step S22, the temperature of the first conveying section 11 is 180-190 ℃; the temperature of the preplasticizing section 13 is 190-200 ℃; the temperature of the second conveying section 14 is 200-210 ℃; the temperature of the dispersion kneading section 15 is 220-225 ℃; the temperature of the melting section 16 is 225-230 ℃; the temperature of the vacuum exhaust section 17 is 230 ℃; the temperature of the head was 225 ℃.
Comparative example 1
As shown in fig. 3, a double-screw combined structure comprises a barrel 1, wherein the barrel 1 is horizontally arranged and is provided with a first end and a second end, and the extending direction from the first end to the second end is the conveying direction of materials. Wherein the position of barrel 1 near first end is provided with feed opening 101, and feed opening 101 communicates with barrel 1 inside, and the material after the raw and other materials misce bene gets into barrel 1 inside through feed opening 101.
Two meshed screw rod combined structures are arranged in the cylinder body 1, the extending direction of the screw rod combined structures from the first end to the second end sequentially comprises a first transmission section 21, a second transmission section 22, a third plasticizing section 23, a fourth plasticizing section 24, a fifth plasticizing section 25, a sixth transmission section 26, a seventh melt blending section 27, an eighth transmission section 28, a ninth melt blending section 29 and a tenth exhaust section 30, and the two connected sections are connected end to end.
Wherein the lead/length of the first transmission section 21 in its direction of extension is respectively: 32/32N,48/48 SK-N,48/48, 48/48, 48/48.
The lead/length of the second transmission section 22 in its direction of extension is 32/32, 32/32, 32/32, respectively.
The kneading blocks of the third plasticizing section 23 arranged in the direction of extension thereof had a kneading disc stagger angle/kneading disc number/total length of 30 °/7/48, 45 °/5/32, respectively.
The lead/length of the fourth transmission section 24 in its direction of extension is 32/32, 32/32, 32/32, respectively.
The kneading blocks of the fifth plasticizing zone 25 arranged in the direction of extension thereof have a kneading disc stagger angle/kneading disc number/total length of 30 °/5/32, 30 °/5/32, 30 °/5/32, respectively. Also included are threaded elements having a lead/length of 22/11L.
The sixth transmission section 26 has a lead/length in its direction of extension of 48/48, 48/48, 48/48, 32/32, 22/22, respectively.
The kneading blocks of the seventh melt-blending section 27 were arranged in the extending direction thereof at a kneading disc stagger angle/kneading disc number/total length of 45 °/5/32, respectively.
The lead/length of the eighth transmission section 28 in its direction of extension is 32/32, 32/32, 32/32, respectively.
The kneading blocks of the ninth melt blending section 29 provided in the extending direction thereof had kneading disc stagger angles/kneading disc numbers/total lengths of 45 °/5/32, respectively. Also included are threaded elements having a lead/length of 22/11L.
The tenth exhaust section 30 is vacuum-exhausted and has leads/lengths in the direction of extension of 48/48, 48/48, 48/48, 22/22, 22/22, 22/22, 22/22, 22/22, respectively.
The cylinder body 1 above the tenth exhaust section 30 is provided with an exhaust port 301, and water vapor and low molecular substances generated in the cylinder body 1 by materials are exhausted and pumped away through the exhaust port 301, so that the interior of the materials is more compact, the materials are gradually extruded, and better granulating conditions are achieved.
The application method of the double-screw combined structure of the comparative example 1 in preparing PMMA and ASA composite polymer material comprises the following steps:
s31, weighing 55-80 parts of PMMA resin as raw materials in parts by weight; 20-35 parts of ASA rubber powder; 0.1-0.5 part of antioxidant; 0.2-1 part of lubricant; 1-5 parts of high-light color master batch;
s32, starting the double-screw combined structure to rotate, adding materials formed by raw materials into a feed opening 101 of the cylinder body 1, and conveying, melting, extruding and cooling the double-screw combined structure to obtain the PMMA and ASA composite polymer material, which is marked as particles 3.
In step S32, the temperatures of the first transmission section 21 and the second transmission section 22 are 180-190 ℃; the temperature of the third plasticizing section is 190-200 ℃; the temperature of the fourth transmission section is 200-210 ℃; the temperature of the fifth plasticizing section 25 is 210-220 ℃; the temperature of the sixth transfer section 26 is 220-225 ℃; melt blending section: 225-230 ℃, and an eighth mixed conveying section: 230-235 ℃, the temperature of the ninth melt blending section 29 is 235 ℃; the temperature of the tenth exhaust section 30 is 230 ℃; the temperature of the head was 225 ℃. The temperature of the plasticizing section is 190-200 ℃; the temperature of the fourth transmission section is 200-210 ℃; the temperature of the fifth plasticizing section 25 is 210-220 ℃; the temperature of the sixth transfer section 26 is 220-225 ℃; melt blending section: 225-230 ℃, and an eighth mixed conveying section: 230-235 ℃, the temperature of the ninth melt blending section 29 is 235 ℃; the temperature of the tenth exhaust section 30 is 230 ℃; the temperature of the head was 225 ℃.
The mechanical properties of the particulate materials prepared in example 1, example 2 and comparative example 1 above were tested.
1. Cantilever notched impact the samples were tested by impact tester according to ISO180 standard "determination of impact strength of plastics cantilever".
2. Tensile strength: the samples were tested by a universal tester according to the ISO178 standard "determination of flexural Properties of plastics".
3. Flexural strength: the samples were tested by a universal tester according to the ISO178 standard "determination of flexural Properties of plastics".
4. Load 0.45MPa, heat distortion temperature: the samples were tested by means of a Vicat tester according to GB/T1634 determination of deformation temperature under Plastic load.
The mechanical properties are shown in table 1 below.
TABLE 1 mechanical test results
| Sample of | Comparative example 1 | Example 1 | Example 2 |
| Cantilever beam notch impact (KJ/squaremeter) | 4.5 | 8.6 | 7.8 |
| Tensile Strength (MPa) | 43.4 | 45.5 | 45.4 |
| Flexural Strength (MPa) | 63.1 | 63.7 | 63.5 |
| Load 0.45MPa, heat distortion temperature (. Degree. C.) | 88.6 | 90.2 | 89.9 |
From the results of the performance test in Table 1, it can be seen that the mechanical properties of the polymer composites prepared in example 1 and example 2 are superior to those of comparative example 1. Because of the screw combination structure of the comparative example 1, the shearing capacity is strong, and the material is degraded, so that the material performance is greatly reduced. For example, according to the fact that the length of the conveying section between the third plasticizing section and the fifth plasticizing section is only 96mm, the conveying distance is short, and the material is frequently sheared, so that shearing force is enhanced. In contrast, according to the screw combination structure of example 1, for example, the distance between the preplasticizing section and the second conveying section between the dispersion kneading section is 316mm, the material is not frequently sheared, and the material performance is obviously improved by reducing the shearing capacity of the screw combination.
The particle materials prepared in example 1, example 2 and comparative example 1 above were subjected to processability tests, and the test results are shown in table 2 below.
TABLE 2 processability test results
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps recited in the present disclosure may be performed in parallel or sequentially or in a different order, provided that the desired results of the technical solutions of the present disclosure are achieved, and are not limited herein.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present disclosure, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The foregoing is merely specific embodiments of the disclosure, but the protection scope of the disclosure is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the disclosure, and it is intended to cover the scope of the disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims (13)
1. A twin screw composite structure comprising:
a barrel including a first end and a second end; two meshed screw rod combined structures are arranged in the cylinder body, and the screw rod combined structures sequentially comprise, along the direction from the first end to the second end:
the first conveying section is arranged in the cylinder and is used for conveying materials;
the compression section is arranged in the cylinder body and connected with the first conveying section and is used for compressing materials so as to densify the materials;
the pre-plasticizing section is arranged in the cylinder and connected with the compression section and is used for shearing plasticizing materials;
the second conveying section is arranged in the cylinder body and connected with the pre-plasticizing section and used for extruding the pre-plasticized material;
the dispersing and kneading section is arranged in the cylinder body and connected with the second conveying section and is used for shearing and dispersing the materials extruded by the second conveying section;
the melting section is arranged in the cylinder and connected with the dispersion kneading section and is used for melting materials;
the vacuum exhaust section is arranged in the cylinder and connected with the melting section and is used for exhausting water and micromolecular substances;
wherein the length of the second conveying section is greater than the lengths of the pre-plasticizing section and the dispersion kneading section.
2. The twin screw combination as defined in claim 1, wherein the lead/length of the first conveying section in its direction of extension is greater than the lead/length of the compression section in its direction of extension.
3. The twin-screw combination as defined in claim 2, wherein the lead/length of the first conveying section in the direction of extension thereof is 32/32sk,48/48, 48/48, 48/48; or (b)
The lead/length of the first conveying section in the extending direction thereof is 32/32sk,48/48, 48/48, 48/48, respectively.
4. A twin-screw combined structure as defined in claim 2 or 3, in which the lead/length of the compression section in the direction of extension thereof is 32/32, 32/32, 32/32, 32/32, 32/32, respectively.
5. The twin-screw composite structure according to claim 1, wherein the kneading blocks of the pre-plasticizing section are arranged in the extending direction thereof with kneading blocks having kneading disc stagger angles/kneading disc number/total length of 30 °/7/48, 45 °/5/32, 45 °/5/32, 45 °/5/32, respectively; the pre-plasticizing section also includes a threaded element having a lead/length of 22/11L.
6. The twin-screw combination as defined in claim 1, wherein the second conveying sections have leads/lengths in the direction of extension of 48/48, 48/48, 48/48, 32/32, respectively.
7. The twin screw combination as defined in claim 6, in which the second conveying section further comprises threaded elements of lead/length 22/22, 22/22 respectively.
8. The twin-screw composite structure according to claim 1, wherein the kneading blocks of the dispersion kneading block are arranged in the extending direction thereof at a kneading disc stagger angle/kneading disc number/total length of 45 °/5/32, respectively.
9. The twin screw composite structure of claim 8, wherein the dispersive kneading block further comprises kneading blocks having a kneading disc stagger angle/kneading disc number/total length of 45 °/5/32, 60 °/4/22, respectively.
10. The twin-screw composite structure according to claim 1, wherein the lead/length of the melting section in the extending direction thereof and the kneading disc stagger angle/kneading disc number/total length of the kneading blocks are 32/32, 32/32, 45 °/5/32, 45 °/5/32, 45 °/5/32, 22/11L, respectively.
11. The twin-screw composite structure according to claim 1, wherein the lead/length of the melting section in the extending direction thereof and the kneading disc stagger angle/kneading disc number/total length of the kneading blocks are 32/32, 32/32, 45 °/5/32, 45 °/5/32, 90 °/5/32, 22/11L, respectively.
12. The twin-screw combined structure according to claim 1, wherein the leads/lengths of the vacuum exhaust section in the extending direction thereof are respectively: 48/48, 48/48, 48/48, 32/32, 32/32, 32/32, 22/22, 22/22, 22/22; or (b)
The leads/lengths of the vacuum exhaust section in the extending direction are respectively as follows: 48/48, 48/48, 32/32, 32/32, 22/22, 22/22, 22/22, 22/22.
13. An extruder comprising the twin screw combination of any one of claims 1-12.
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