CN117464943A - Continuous blending preparation method and equipment for multiphase biopolymer composite material - Google Patents
Continuous blending preparation method and equipment for multiphase biopolymer composite material Download PDFInfo
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- CN117464943A CN117464943A CN202311620684.0A CN202311620684A CN117464943A CN 117464943 A CN117464943 A CN 117464943A CN 202311620684 A CN202311620684 A CN 202311620684A CN 117464943 A CN117464943 A CN 117464943A
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- 229920001222 biopolymer Polymers 0.000 title claims abstract description 59
- 238000002156 mixing Methods 0.000 title claims abstract description 44
- 239000002131 composite material Substances 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000011258 core-shell material Substances 0.000 claims abstract description 9
- 238000006073 displacement reaction Methods 0.000 claims abstract description 7
- 239000013598 vector Substances 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 44
- 238000001125 extrusion Methods 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 19
- 239000005014 poly(hydroxyalkanoate) Substances 0.000 claims description 17
- 229920000747 poly(lactic acid) Polymers 0.000 claims description 17
- 229920000903 polyhydroxyalkanoate Polymers 0.000 claims description 17
- 239000004626 polylactic acid Substances 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 13
- 230000009467 reduction Effects 0.000 claims description 11
- 239000000155 melt Substances 0.000 claims description 7
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 3
- 229920008262 Thermoplastic starch Polymers 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 229920001610 polycaprolactone Polymers 0.000 claims description 3
- 239000004632 polycaprolactone Substances 0.000 claims description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 3
- 239000004628 starch-based polymer Substances 0.000 claims description 3
- 238000013459 approach Methods 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims description 2
- 230000007423 decrease Effects 0.000 claims description 2
- 239000002861 polymer material Substances 0.000 abstract description 17
- 229920013724 bio-based polymer Polymers 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 8
- 229920000642 polymer Polymers 0.000 abstract description 7
- 238000012545 processing Methods 0.000 abstract description 7
- 238000012546 transfer Methods 0.000 abstract description 5
- 239000002245 particle Substances 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 238000010297 mechanical methods and process Methods 0.000 abstract description 3
- 230000005226 mechanical processes and functions Effects 0.000 abstract description 3
- 230000010349 pulsation Effects 0.000 abstract description 3
- 238000000465 moulding Methods 0.000 abstract description 2
- 230000009471 action Effects 0.000 description 13
- 208000034530 PLAA-associated neurodevelopmental disease Diseases 0.000 description 4
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000000930 thermomechanical effect Effects 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- 208000037534 Progressive hemifacial atrophy Diseases 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012017 passive hemagglutination assay Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
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
- B29C48/001—Combinations of extrusion moulding with other shaping operations
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The invention discloses a continuous blending preparation method and equipment for a multiphase biopolymer composite material, which belong to the technical field of molding and processing of a bio-based polymer material. Under the drive of the transmission system, the rotor rotates in the inner cavity of the stator in the opposite direction to the revolution direction, and the speed ratio is 1:4, further applying a pulse ultrahigh pressure effect on the multiphase biopolymer system in the composite material, and driving the composite material to perform positive displacement pulsation of a velocity gradient vector approaching to a flowing direction, so that the thinned polymer phase particles with relatively high apparent viscosity are coated with polymer phases with relatively low apparent viscosity to form the composite material with a core-shell microstructure. The invention has the advantages of high mass and heat transfer efficiency, short thermal mechanical process, good mixing and dispersing effects, high comprehensive performance and the like.
Description
Technical Field
The invention belongs to the technical field of molding and processing of bio-based polymer materials, and particularly relates to a continuous blending preparation method and equipment of a multiphase bio-polymer composite material.
Background
Because petroleum-based high polymer materials are not degradable, such as improper disposal, certain pollution to the environment is easily caused. The bio-based polymer material (such as PLA, PHA, starch and the like) has good mechanical property and biocompatibility, is derived from biomass materials, can be completely degraded, and is becoming the most ideal environment-friendly polymer material for replacing the traditional petroleum-based plastics. However, the single type of bio-based polymer material has obvious performance defects, for example, although PLA has higher tensile strength and elastic modulus, the single type of bio-based polymer material is brittle and has poor toughness, so that the application range of PLA is greatly limited; PHAs have certain drawbacks in terms of crystallization, mechanical properties, thermal stability, etc., which also limit their range of application. Therefore, two or more biological polymer materials are required to be subjected to modification treatment such as blending, copolymerization, plasticization and the like so as to prepare a completely degradable multiphase biological polymer composite system, improve the comprehensive performance of the biological polymer materials and expand the application range of the biological polymer materials. The melt blending method is widely used for blending modification of multiphase biopolymer materials due to the advantages of simple operation, strong controllability, low cost and the like.
However, the bio-based polymer material is sensitive to temperature and is easy to degrade at high temperature, so that the processing temperature range is narrow, and great constraint is generated on the melt blending processing of the bio-based polymer material. The traditional melt blending equipment is mainly based on a shear deformation processing mechanism, and in the processing process, shear acting force is perpendicular to the material flowing direction, so that the thermal mass transfer of a melt, the blending and compatibilization of multiphase biopolymer materials and the regulation and control of multiphase system micro-interfaces are not facilitated, and the shear heating is large, the thermal mechanical process is long, and the breakage and degradation of material molecular chains are easy to cause. Therefore, development of a new technology for melt blending of bio-based polymer materials to prepare bio-polymer materials having excellent properties is urgently required.
Disclosure of Invention
Aiming at the defects or improvement demands of the prior art, the invention provides a continuous blending preparation method and equipment for a multiphase biopolymer composite material, which aim to utilize the pulse ultrahigh pressure effect of blending equipment to enable a multi-component biopolymer material to be subjected to positive displacement pulsation continuous melt blending with a velocity gradient vector approaching to a flow direction, and can effectively regulate continuous dynamic generation and evolution of a micro-interface in a multiphase system so as to prepare the high-performance multiphase biopolymer composite material, thereby solving the technical problems of uneven microstructure, poor comprehensive performance, long thermomechanical process and easy degradation of the multiphase blending biopolymer material.
In order to achieve the above object, according to one aspect of the present invention, there is provided a continuous blending preparation method of a multiphase biopolymer composite material, the method comprising the steps of: and (3) carrying out melt blending on various biopolymer materials with different components by using the pulse ultrahigh pressure so as to form the multiphase biopolymer composite material with the core-shell microstructure.
Further preferably, the biopolymer materials of the various components are melt blended;
the volume of the multicomponent biological polymer material is continuously compressed and released under the action of the pulse ultrahigh pressure, so that the multicomponent biological polymer material is forced to do positive displacement pulsating flow with the velocity gradient vector approaching to the flowing direction;
the multi-component biopolymer material is continuously refined under the forcing of the alternating action of volume compression and release, and the continuous dynamic generation and evolution of the micro-interfaces in the multi-component biopolymer material are forced;
the thinned biopolymer phase particles with relatively high apparent viscosity under the action of the pulse ultrahigh pressure are coated by the biopolymer phase with relatively low apparent viscosity, so that the multiphase biopolymer composite material with the core-shell microstructure is formed.
Preferably, the pulse ultrahigh pressure continuously orients the materials during melt blending of the multiphase biopolymer materials, thereby providing good orientation of the core-shell microstructure.
Preferably, the size of the pulse ultrahigh pressure applied to the continuous blending process of the biopolymer material is changed according to the melt strength of the biopolymer material, and the maximum pressure range of the pulse ultrahigh pressure is 0.1-50 MPa.
Preferably, the pulse ultrahigh pressure is generated by meshing rotation of a rotor with a four-circle topological structure in a stator with a five-circle topological inner cavity structure, wherein the rotation and revolution directions of the rotor are opposite, and the speed ratio is 1:4.
Preferably, the apparent viscosities of the biopolymer materials of the various components are different.
Preferably, the biopolymer material comprises polylactic acid, polylactide, thermoplastic starch, polyhydroxyalkanoate, polycaprolactone, polyvinyl alcohol, and the like.
According to another aspect of the present invention, there is provided an apparatus for implementing a method of continuously blending a multiphase biopolymer composite, the apparatus comprising a frame, and a motor, a coupling, a power reduction distributor, an extrusion system and a temperature control system disposed on the frame;
the motor, the coupler, the power reduction distributor and the extrusion system are sequentially connected; the temperature control system is arranged on the periphery of the extrusion system;
the extrusion system comprises a rotor and a stator, wherein the cross section of the rotor is a curved-edge topological quadrilateral, and the surface of the rotor is formed by alternately changing a spiral topological structure and a straight section structure continuously; the stator is provided with a stator cavity, the cross section of the stator cavity is a curved Bian Tapu pentagon, the inner surface of the stator cavity is formed by alternately changing a spiral topological structure and a straight section structure, and the stator cavity and the surface structure of the rotor are in one-to-one correspondence;
the rotor is arranged in the stator cavity, and an external topological curved surface of the rotor is meshed with an internal topological curved surface of the stator cavity and divides the stator cavity into five chambers;
and the rotor is driven by the power speed reducing distributor to do planetary motion with the rotation and revolution directions opposite and the speed ratio of 1:4 in the stator cavity.
Preferably, the pitch of the spiral topological structure of the rotor is gradually decreased from the feeding end to the discharging end; the pitch of the spiral topological structure of the stator cavity is 1.25 times of the pitch of the rotor spiral topological structure at the corresponding position, and the length of the rotor straight section structure is equal to that of the stator cavity straight section structure.
Preferably, in the process that the rotor performs planetary motion in the stator cavity, the outer surface of the rotor continuously approaches to the inner surface of the stator cavity in five cavities of the stator cavity, so that pulse ultrahigh pressure is generated in the stator cavity, and positive stress is applied to the biopolymer material, so that the biopolymer material performs positive displacement pulsating flow with velocity gradient vectors approaching to the flowing direction.
Preferably, the rotation speed range of the rotor is 0-100rpm, the temperature control system is divided into five control areas on the stator along the extrusion direction, the temperature range of each control area is room temperature-300 ℃, and the temperature control precision is +/-2 ℃.
In general, the above technical solutions conceived by the present invention, compared with the prior art, enable the following beneficial effects to be obtained:
1. the continuous blending preparation method of the multiphase biopolymer composite material provided by the invention utilizes the pulse ultrahigh pressure effect to enable the multi-component biopolymer material to be subjected to positive displacement pulsation continuous melt blending with the velocity gradient vector approaching to the flowing direction, can effectively regulate and control continuous dynamic generation and evolution of micro interfaces in a multiphase system, further prepares the high-performance multiphase biopolymer composite material, and can effectively regulate and control continuous dynamic generation and evolution of micro interfaces in the multiphase biopolymer composite system, thereby solving the problems of uneven microstructure, poor comprehensive performance, long thermal mechanical process, easiness in degradation and the like of the multiphase biopolymer composite material in the blending process.
2. According to the continuous blending preparation method of the multiphase biopolymer composite material, provided by the invention, the pulse ultrahigh pressure is generated by the fact that a rotor with a four-circle topological structure rotates in a stator with a five-circle topological inner cavity structure, the rotation and revolution directions are opposite, and the speed ratio is 1:4, and the pulse ultrahigh pressure based on positive stress is applied to the material, so that the mass transfer and heat transfer efficiency and the mixing dispersion effect of the material in the processing process are greatly improved.
3. The equipment for the continuous blending preparation method of the multiphase biopolymer composite material provided by the invention applies continuous and directional pulse ultrahigh pressure action in the process of carrying out melt blending on the multiphase biopolymer composite material, and has the advantages of high mass and heat transfer efficiency, good mixing and dispersing effects, short thermomechanical process, low temperature rise, small damage to the molecular chain of the multiphase biopolymer composite material and the like.
4. The pulse ultrahigh pressure action mixing mechanism provided by the invention can promote the bio-based polymer phase with relatively low apparent viscosity to coat polymer phase particles with relatively high apparent viscosity, so as to form the multiphase bio-polymer composite material with a core-shell microstructure, thereby greatly improving the physical and mechanical properties of the multiphase bio-polymer composite material.
Drawings
FIG. 1 is a schematic structural diagram of a continuous blending device for a multiphase biopolymer composite under the action of pulsed ultra-high pressure in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a cross section of an extrusion system of a pulse ultra-high pressure extruder in different phases of operation according to an embodiment of the present invention;
fig. 3 is a schematic diagram of the principle of the pulsed ultra-high pressure action in an embodiment of the invention.
The same reference numbers are used throughout the drawings to reference like elements or structures, wherein: 1-a frame; 2-an electric motor; a 3-coupling; 4-a power reduction distributor; 5-a hopper; 6-rotor; 7-a stator; 8-extruding outlet; 9-a first feeder; 10-a second feeder.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
As shown in figure 1, the invention provides a multiphase biopolymer composite material continuous blending device with a pulse ultrahigh pressure effect, which comprises a frame system, a power transmission system, a temperature control system, an extrusion system and a feeding system. The rack system is mainly a rack 1; the power transmission system mainly comprises a motor 2, a coupler 3 and a power reduction distributor 4; the temperature control system is mainly a heating and cooling device of the stator; the extrusion system mainly comprises a rotor 6, a stator 7 and a hopper 5; the feeding system mainly consists of a first feeding machine 9 and a second feeding machine 10. The motor 2 and the power reduction distributor 4 are fixedly connected to the bracket 1; the output shaft of the motor 2 is connected with the input shaft of the power reduction distributor 4 through a coupler 3; the rotor 6 is arranged in the inner cavity of the stator 7 and is connected with the output shaft of the power reduction distributor 4 by a flat key; one side of the stator 7 is fixedly connected with the power reduction distributor 4 by a connecting half, and the other side is supported by a stator support frame; the heating and cooling device is arranged on the outer side of the stator 7; the hopper 6 is arranged at the feed opening of the stator A7; the first feeder 9 and the second feeder 10 are respectively arranged on the left side and the right side above the hopper 6, and the outlets of the two feeders are positioned right above the hopper 6.
Specifically, the rotor 6 is a topological structure with continuously changing outer surface, the cross section of the rotor is a curved-edge topological quadrangle with a round chamfer and a concave arc, as shown in fig. 2, the rotor 6 structure is composed of spiral sections and straight sections, wherein the straight section structure is arranged between the spiral section structures, and the pitch of the spiral sections is gradually reduced along the extrusion direction.
To further explain, the inner cavity surface of the stator 7 is also a continuously variable topology structure, the cross section of the inner cavity is a circular chamfer convex arc Bian Tapu pentagon, as shown in fig. 2, the inner cavity structure is also composed of spiral sections and flat sections, wherein the flat section structure is arranged between the spiral section structures, the spiral section and flat section structures of the stator 7 are in one-to-one correspondence with the spiral section and flat section structures of the rotor 6, the lengths are the same, the pitch of the spiral section is also gradually reduced along the extrusion direction, and the pitch of each part of the spiral section of the stator 7 is 1.25 times that of the corresponding spiral section of the rotor 6.
To further illustrate, the outer topological surface of the rotor 6 engages with the inner topological surface of the inner cavity of the stator 7. When in operation, the rotor 6 reversely revolves around the axis of the inner cavity of the stator 7 by taking the eccentric quantity e as a radius while rotating under the drive of the power speed reducing distributor 4, the revolution speed is 4 times of the rotation speed, and the inner cavity of the stator 7 is divided into five chambers, namely, A, B, C, D, E chambers in fig. 2; the rotor 6 rotates for a circle, and the five chambers respectively finish compression release function four times in sequence. Fig. 2 shows the compression release process of five chambers during the operation of the rotor 6, wherein in each chamber, the rotor 6 gradually compresses, the force applied to the material gradually increases, the pressure reaches the maximum when the chamber volume is compressed to the minimum, and then when the rotor 6 releases, the chamber volume gradually increases, and the pressure gradually decreases. When the rotor 6 is continuously operated in the inner cavity of the stator 7, the material in each cavity is subjected to continuous pulsed ultra-high pressure, as shown in fig. 3.
Further describing, the rotation speed of the rotor 6 is 0-100rpm, the temperature control system is divided into five control areas on the stator along the extrusion direction, and the temperature range of each temperature control area is room temperature-300 ℃, and the temperature control precision is +/-2 ℃.
Further describing, the biopolymer raw materials are respectively fed into the hopper 5 by the first feeder 9 and the second feeder 10 according to the formula ratio.
Further, the biopolymer material includes, but is not limited to, polylactic acid, polylactide, thermoplastic starch, polyhydroxyalkanoate, polycaprolactone, polyvinyl alcohol, etc., and there is a certain difference in apparent viscosity between two or more different components of the biopolymer material. In this example, polylactic acid (PLA) and Polyhydroxyalkanoate (PHA) were used as the bio-based polymer materials.
Further describing, the pulse ultrahigh pressure applied in the continuous blending process of the multiphase biopolymer material varies with the melt strength of the multiphase biopolymer material, and the maximum pressure ranges from 1 MPa to 50MPa.
The embodiment of the invention also provides a continuous blending preparation method of the multiphase biopolymer composite material with the pulse ultrahigh pressure effect, which comprises the following steps: setting the temperature of a peripheral temperature control device of the stator 7 to be 130-160-180 ℃ along the extrusion direction; respectively feeding bio-based polymer raw materials PLA and PHA into hoppers of a first feeding machine 9 and a second feeding machine 10; the rotating speed of the rotor 6 is set to be 50rpm, the motor 2 is started, and the motor 2 drives the rotor 6 to rotate in the opposite direction of revolution through the coupler 3 and the power reduction distributor 4, and the speed ratio is 1:4, compound motion; the first feeder 9 and the second feeder 10 are started, and the first feeder 9 and the second feeder 10 respectively convey PLA and PHA into the hopper 5 according to the formula proportion, and then the PLA and the PHA enter the stator 7 from the hopper 5, so that the PLA and the PHA are melt blended in the extrusion system.
Under the spiral pushing of the rotor 6 and the meshing action of the rotor 6 and the inner cavity of the stator 7, the materials are accommodated in the inner cavity of the stator 7 and continuously conveyed forwards, the materials in the five chambers of the rotor 6 rotate for one friday respectively and are subjected to the positive stress action exerted by the rotor 6 and generate local ultrahigh pressure, so that the materials are subjected to continuous pulse ultrahigh pressure action under the rapid rotation of the rotor 6 in the forward conveying process, and the PLA/PHA mixed materials are continuously compressed and released in volume under the action of the pulse ultrahigh pressure, so that the PLA/PHA mixed materials are forced to perform positive displacement pulsating flow with velocity gradient vectors approaching to the flowing direction; the alternating action of volume compression and release generated between the inner cavities of the rotor 6 and the stator 7 forces the PLA/PHA mixed material to be continuously refined and forces the micro-interface in the PLA/PHA mixed material to be continuously and dynamically generated and evolved; the PHA phase particles which are thinned under the action of the pulse ultrahigh pressure and have relatively high apparent viscosity are coated by PLA with relatively low apparent viscosity, so that the PLA/PHA composite material with well-oriented core-shell microstructure is formed. Finally, the PLA/PHA composite material which is uniformly mixed is continuously extruded from an extrusion port 8 by a rotor 6, so that the PLA/PHA composite material which is uniformly mixed and dispersed, has excellent performance and has a core-shell microstructure is prepared. In addition, the rotor 6 and the inner cavity of the stator 7 have good meshing relationship, so that the inner cavity of the stator 7 can be self-cleaned and the material can be positively conveyed.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. A continuous blending preparation method of a multiphase biopolymer composite material is characterized in that: and (3) carrying out melt blending on various biopolymer materials with different components by using the pulse ultrahigh pressure so as to form the multiphase biopolymer composite material with the core-shell microstructure.
2. The method for continuously blending and preparing the multiphase biopolymer composite according to claim 1, wherein the pulse ultrahigh pressure is generated by meshing rotation of a rotor with a four-circle topological structure in a stator with a five-circle topological inner cavity structure, wherein the rotation and revolution directions of the rotor are opposite, and the speed ratio is 1:4.
3. The continuous blending preparation method of the multiphase biopolymer composite material according to claim 1, wherein the size of the pulse ultrahigh pressure applied to the continuous blending process of the biopolymer material is changed with the melt strength of the biopolymer material, and the maximum pressure range of the pulse ultrahigh pressure is 0.1-50 MPa.
4. The method for continuously blending and preparing the multiphase biopolymer composite material according to claim 1, wherein the pulsed ultra-high pressure continuously orients the material during the melt blending process of the multiphase biopolymer material, thereby providing good orientation of the core-shell microstructure.
5. The method for continuous blending preparation of multiphase biopolymer composite materials according to claim 1, wherein the apparent viscosities of the biopolymer materials of various components are different.
6. The continuous blending preparation method of the multiphase biopolymer composite material according to claim 5, wherein the biopolymer material comprises polylactic acid, polylactide, thermoplastic starch, polyhydroxyalkanoate, polycaprolactone, polyvinyl alcohol, etc.
7. An apparatus for realizing the continuous blending preparation method of the multiphase biopolymer composite material according to any one of claims 1-6, characterized in that the apparatus comprises a frame (1), and a motor (2), a coupling (3), a power reduction distributor (4), an extrusion system and a temperature control system which are arranged on the frame (1);
the motor (2), the coupler (3), the power reduction distributor (4) and the extrusion system are connected in sequence; the temperature control system is arranged on the periphery of the extrusion system;
the extrusion system comprises a rotor (6) and a stator (7), wherein the cross section of the rotor (6) is in a curved-edge topological quadrilateral, and the surface of the rotor is formed by alternately changing a spiral topological structure and a straight section structure continuously; the stator (7) is provided with a stator cavity, the cross section of the stator cavity is a curved Bian Tapu pentagon, the inner surface of the stator cavity is formed by alternately changing a spiral topological structure and a straight section structure, and the stator cavity and the surface structure of the rotor (6) are in one-to-one correspondence;
the rotor (6) is arranged in the stator cavity, and an external topological curved surface of the rotor is meshed with an internal topological curved surface of the stator cavity and divides the stator cavity into five chambers;
and the rotor (6) is driven by the power speed reducing distributor (4) to do planetary motion with the rotation and revolution directions opposite and the speed ratio of 1:4 in the stator cavity.
8. An apparatus according to claim 7, characterized in that the pitch of the helical topology of the rotor (6) decreases gradually from the feed end to the discharge end; the pitch of the spiral topological structure of the stator cavity is 1.25 times of the pitch of the rotor spiral topological structure at the corresponding position, and the length of the rotor (6) straight section structure is equal to that of the stator cavity straight section structure.
9. An apparatus according to claim 8, characterized in that the rotor (6) is arranged to move in a planetary motion in the stator chamber, wherein the outer surface of the rotor (6) is arranged to continuously approach the inner surface of the stator chamber in five chambers of the stator chamber, thereby generating a pulsed ultra-high pressure in the stator chamber and thereby exerting a positive stress on the biopolymer material, causing it to move in a positive displacement pulsating flow with a velocity gradient vector approaching the flow direction.
10. An apparatus according to claim 9, characterized in that the rotor (6) rotates at a speed in the range of 0-100rpm, and the temperature control system is divided in the direction of extrusion into five control zones on the stator (7), each control zone having a temperature in the range of room temperature-300 ℃ and a temperature control accuracy of ± 2 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311620684.0A CN117464943A (en) | 2023-11-30 | 2023-11-30 | Continuous blending preparation method and equipment for multiphase biopolymer composite material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311620684.0A CN117464943A (en) | 2023-11-30 | 2023-11-30 | Continuous blending preparation method and equipment for multiphase biopolymer composite material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117464943A true CN117464943A (en) | 2024-01-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311620684.0A Pending CN117464943A (en) | 2023-11-30 | 2023-11-30 | Continuous blending preparation method and equipment for multiphase biopolymer composite material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117464943A (en) |
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2023
- 2023-11-30 CN CN202311620684.0A patent/CN117464943A/en active Pending
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