CN114536583A - Thermoplastic resin high-temperature melt extrusion molding and granulating method capable of sufficiently removing oxygen - Google Patents
Thermoplastic resin high-temperature melt extrusion molding and granulating method capable of sufficiently removing oxygen Download PDFInfo
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- CN114536583A CN114536583A CN202210050567.4A CN202210050567A CN114536583A CN 114536583 A CN114536583 A CN 114536583A CN 202210050567 A CN202210050567 A CN 202210050567A CN 114536583 A CN114536583 A CN 114536583A
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- extrusion molding
- hopper
- nitrogen gas
- nitrogen
- granulation
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- 238000000034 method Methods 0.000 title claims abstract description 57
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 239000001301 oxygen Substances 0.000 title claims abstract description 42
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 42
- 238000001125 extrusion Methods 0.000 title claims abstract description 40
- 229920005992 thermoplastic resin Polymers 0.000 title claims abstract description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 96
- 230000008569 process Effects 0.000 claims abstract description 38
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 30
- 229920005989 resin Polymers 0.000 claims abstract description 28
- 239000011347 resin Substances 0.000 claims abstract description 28
- 238000005469 granulation Methods 0.000 claims abstract description 26
- 230000003179 granulation Effects 0.000 claims abstract description 26
- -1 polypropylene Polymers 0.000 claims abstract description 18
- 239000004743 Polypropylene Substances 0.000 claims abstract description 16
- 229920001155 polypropylene Polymers 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 13
- 239000004793 Polystyrene Substances 0.000 claims abstract description 3
- 229920002223 polystyrene Polymers 0.000 claims abstract description 3
- 229920000915 polyvinyl chloride Polymers 0.000 claims abstract description 3
- 239000004800 polyvinyl chloride Substances 0.000 claims abstract description 3
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 36
- 238000011049 filling Methods 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 8
- 229920000728 polyester Polymers 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 7
- 239000004952 Polyamide Substances 0.000 claims description 2
- 239000004698 Polyethylene Substances 0.000 claims description 2
- 229920002647 polyamide Polymers 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 229920002635 polyurethane Polymers 0.000 claims description 2
- 239000004814 polyurethane Substances 0.000 claims description 2
- 238000005453 pelletization Methods 0.000 claims 2
- 238000007599 discharging Methods 0.000 claims 1
- 239000002245 particle Substances 0.000 abstract description 8
- 230000032683 aging Effects 0.000 abstract description 6
- 238000002844 melting Methods 0.000 abstract description 5
- 230000008018 melting Effects 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract description 2
- 230000001172 regenerating effect Effects 0.000 abstract 1
- 239000003963 antioxidant agent Substances 0.000 description 18
- 230000003078 antioxidant effect Effects 0.000 description 12
- 239000004033 plastic Substances 0.000 description 11
- 229920003023 plastic Polymers 0.000 description 11
- 239000012752 auxiliary agent Substances 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 4
- 238000004383 yellowing Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 239000002861 polymer material Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229920002521 macromolecule Polymers 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 230000003064 anti-oxidating effect Effects 0.000 description 1
- 239000011203 carbon fibre reinforced carbon Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000002952 polymeric resin Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
-
- 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
- B29C48/14—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the particular extruding conditions, e.g. in a modified atmosphere or by using vibration
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
The invention provides a method for high-temperature melt extrusion molding and granulation of a thermoplastic resin with sufficient oxygen removal. The method has the advantages that materials and the inner space of the extrusion equipment are deoxidized, and the air inlet channel is blocked in a nitrogen curtain mode, so that the resin is in a completely oxygen-free environment in the high-temperature melting extrusion process, and the aging caused by the reaction of resin molecules and oxygen molecules in a high-temperature melting state is avoided. The method is suitable for extrusion molding and granulation of various high-temperature oxidizable thermoplastic resins such as polypropylene, polystyrene, polyvinyl chloride and the like, and is particularly suitable for recycling, regenerating and granulating various thermoplastic resins. Compared with the particles obtained by the common method, the whiteness or transparency of the resin particles obtained by the extrusion granulation method is obviously improved, and the mechanical property of an extrusion molding sample is also improved to a certain extent.
Description
Technical Field
The invention relates to a thermoplastic resin high-temperature melt extrusion molding and granulation method capable of fully deoxidizing, belonging to the technical field of processing and molding of high polymer materials, in particular to the technical field of resin high-temperature melt extrusion molding and granulation.
Background
Extrusion molding is a method of forcing a heated and melted polymer material to pass through a die of a machine head under the pushing of pressure by means of the extrusion action of a screw or a plunger. The method is an important method commonly used for processing high polymer materials, is one of main forms of plastic material processing, and is suitable for most plastic materials. At present, about 50% of thermoplastic plastic products are formed by extrusion molding, and the extrusion molding can also be used for granulation, mixing, coloring, blending modification and the like.
The plastic extrusion process can be divided into two stages: the first stage is to plasticize the resin (i.e. melt at high temperature to become a viscous fluid) and pass it through a specially shaped die under pressure to become a continuous body with a cross section similar to the shape of the die; the second stage is to use a suitable method to make the extruded continuous body lose the plastic state and become solid, i.e. obtain the required product. The first stage of resin plasticizing process is completed mainly in the core part of screw extruder, i.e. extrusion system, which consists of screw and material barrel.
Common extrusion molding and granulation processes do not have sufficient oxygen removal treatment, and air in gaps of raw material particles, a cylinder vent agent and other passages provide possibility for contact between resin and oxygen. The resin is subjected to a high-temperature plasticizing process during the extrusion molding process, and various thermoplastic resins are in contact with oxygen at high temperature and can undergo a thermooxidative aging reaction, resulting in performance degradation. For example, in the processing and using process of polypropylene, macromolecule alkyl free radicals can be formed due to the homolytic cracking of carbon-hydrogen or carbon-carbon bonds under the action of mechanical stress and heat, free radicals can be formed due to the direct action of macromolecules and oxygen, and the formed free radicals can react with oxygen in the presence of oxygen to generate hydroperoxide, so that the thermal-oxidative aging process is accelerated. Along with the thermal-oxidative aging of PP, molecular chains of polymers are broken, and the relative molecular mass of polymers is reduced, thereby causing a series of reduction of mechanical properties (see Changxin, Zhengronghua, Chuipeng. the thermal-oxidative aging of polypropylene and influencing factors thereof [ J ], academic report of Zhejiang industry university, 2002, 30(5), 475-.
Antioxidants such as hindered phenol, aromatic secondary amine and hindered amine are added (Zhou outline, Shi Piao Cheng. plastics aging and anti-aging technology [ M ]. Beijing: China light industry Press, 1998.) to prevent the polymer resin from thermal oxidation during extrusion molding and granulation to a certain extent and to prevent the performance from being reduced. However, many antioxidants are biologically toxic, and the addition of antioxidants can reduce the environmentally friendly evaluation of plastic products, while the addition of some commonly used classes of antioxidants can lead to yellowing of resin particles or plastic products (Wangzhi. Polymer antioxidant technology Advance [ J ], modern plastic processing applications, 2005,17(3), 55-58).
It is noted that, today, antioxidants are increasingly specialized, and the choice of antioxidant depends on the composition of the resin. In the field of thermoplastic plastics recycling, operators have difficulty in thoroughly knowing the composition of recycled raw materials, and the selection and the use of antioxidants are often inappropriate, which is one of the main reasons that the properties of recycled plastic particles are difficult to control.
The analysis of the high-temperature melt extrusion molding and granulation processes of the thermoplastic resin can fully remove oxygen in the technological process, and the contact between the high-temperature melt of the resin and oxygen molecules is avoided, so that the antioxidant can be used or even not used, the side effect caused by the addition of the antioxidant is reduced, and the method has important significance for improving the quality and the stability of the recycled plastic materials.
Disclosure of Invention
In view of the problems of the prior art, the invention aims to provide a method for high-temperature melt extrusion molding and granulation of a thermoplastic resin with sufficient oxygen removal.
In order to solve the above problems, the present invention adopts the following technical solutions.
A high-temp fusion extruding out method for preparing the thermoplastic resin with sufficient oxygen removed includes such steps as adding the raw thermoplastic resin to the special hopper of screw extruder, closing the hopper, stirring while vacuumizing and filling nitrogen gas to remove oxygen. The operation flow of vacuumizing and nitrogen filling is repeated for 1-3 times until the oxygen in the hopper and in the gaps of the resin materials is completely removed.
(2) And opening nitrogen gas paths arranged at the communicated positions between the interior of the machine barrels such as the air exhaust holes of the screw machine barrel and the die opening of the machine head and the outside, so that nitrogen gas flow forms a nitrogen gas curtain covering the air exhaust holes and the die opening at the flow speed of 0.1-9 meters per second.
(3) The cylinder was purged with nitrogen to discharge oxygen from the inside of the cylinder.
(4) Opening a hopper blanking valve, opening a main machine of the screw extruder, setting a proper process according to the type of the thermoplastic resin, and carrying out melt extrusion molding and granulation. In the extrusion molding and granulation processes, nitrogen is kept to be introduced into the hopper for pressurization, and the exhaust holes and the die opening are kept covered by a nitrogen gas curtain.
The thermoplastic resin in step (1) of the present invention is, but not limited to, polypropylene, polyethylene, polyvinyl chloride, polystyrene, polyester, polyamide, polyurethane, etc.
The hopper specially made in the step (1) of the invention has the following characteristics: the stirring device is arranged, so that materials in the hopper can be properly stirred; the hopper has good tightness when being in a closed state, and is provided with a pipeline for vacuumizing and introducing nitrogen.
The nitrogen gas curtain in the step (2) continuously sends nitrogen gas with a certain flow rate through a preset nitrogen pipeline nozzle, forms nitrogen gas cover on the exhaust hole and the outer part of the die orifice, and cuts off a channel for air to diffuse into the machine barrel.
The invention has the advantages of
Compared with the prior art, the invention has the advantages that:
1) the oxygen is fully removed, the oxygen molecules are prevented from contacting with the resin melt in a high-temperature melting zone, the thermal oxidation effect in the resin melting and extruding process is obviously reduced, and the performance of a formed product or granulated resin is improved.
2) By adopting the technical process, the antioxidant can be used less or even not used in the extrusion process, and the series side effects caused by using the antioxidant are avoided.
3) The technical process is particularly suitable for the anti-oxidation treatment in the regeneration extrusion process of recycled plastics with undefined components, and can obviously improve the quality of regenerated resin particles.
Detailed Description
The technical scheme in the embodiment of the invention is clearly and completely described below; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
Example 1:
step 1: adding the polypropylene resin powder and the related auxiliary agents into a specially-made hopper of a screw extruder, wherein the using amount of the antioxidant is reduced by half, closing the hopper, and vacuumizing and filling nitrogen into the hopper under the stirring condition to remove oxygen. The operation flow of vacuumizing and nitrogen filling is repeated for 2 times until the oxygen in the hopper and in the gaps of the resin materials is completely removed.
Step 2: and opening nitrogen gas circuits arranged at the positions where the insides of the machine barrels, such as the air vent of the machine barrel of the screw rod, the die opening of the machine head and the like, are communicated with the outside, so that nitrogen gas flow forms a nitrogen gas curtain covering the air vent and the die opening at the flow speed of 3 meters per second.
And 3, step 3: the cylinder was purged with nitrogen to discharge oxygen from the inside of the cylinder.
And 4, step 4: opening a hopper blanking valve, opening a main machine of the screw extruder, setting a proper process according to the process parameters required by the corresponding grade of the used polypropylene resin, and performing melt extrusion granulation. In the extrusion granulation process, nitrogen is kept to be introduced into the hopper for pressurization, and the nitrogen gas curtain covering of the vent hole and the die opening is kept.
The polypropylene resin particles obtained by granulation have no yellowing phenomenon and high glossiness.
Example 2:
step 1: adding the polypropylene resin powder and the related auxiliary agent into a specially-made hopper of a screw extruder, wherein the related auxiliary agent does not contain an antioxidant, closing the hopper, and vacuumizing and filling nitrogen into the hopper under the stirring condition to remove oxygen. The operation flow of vacuumizing and nitrogen filling is repeated for 3 times until the oxygen in the hopper and in the gaps of the resin materials is completely removed.
Step 2: and opening nitrogen gas paths arranged at the positions where the insides of the machine barrels, such as the exhaust holes of the machine barrel of the screw rod, the die opening of the machine head and the like, are communicated with the outside, so that nitrogen gas flow forms a nitrogen gas curtain covering the exhaust holes and the die opening at the flow speed of 6 meters per second.
And step 3: the cylinder was purged with nitrogen to discharge oxygen from the inside of the cylinder.
And 4, step 4: and opening a hopper blanking valve, opening a main machine of the screw extruder, setting a proper process according to the process parameters required by the corresponding grade of the used polypropylene resin, and melting and extruding the sheet with the thickness of 4mm and the width of 50 mm. In the extrusion molding process, nitrogen is kept to be introduced into the hopper for pressurization, and the exhaust holes and the die opening are kept covered by a nitrogen gas curtain.
Preparing a mechanical property test standard sample from the sheet obtained by molding, testing the tensile strength according to GB/T1040-. The detection result shows that on the premise of not adopting an antioxidant, the sheet prepared by the process has no obvious change in tensile strength and impact strength compared with the sheet prepared by the existing antioxidant-added forming process.
Example 3:
step 1: adding the recovered polypropylene flake raw material into a specially-made hopper of a screw extruder, closing the hopper without adding auxiliaries such as an antioxidant and the like, and vacuumizing and filling nitrogen into the hopper under the stirring condition to remove oxygen. The operation flow of vacuumizing and nitrogen filling is repeated for 3 times until the oxygen in the hopper and in the gaps of the resin materials is completely removed.
Step 2: and opening nitrogen gas paths arranged at the positions where the insides of the machine barrels, such as the exhaust holes of the machine barrel of the screw rod, the die opening of the machine head and the like, are communicated with the outside, so that nitrogen gas flow forms a nitrogen gas curtain covering the exhaust holes and the die opening at the flow speed of 6 meters per second.
And step 3: the cylinder was purged with nitrogen to discharge oxygen from the inside of the cylinder.
And 4, step 4: and opening a hopper blanking valve, opening a main machine of the screw extruder, setting and adjusting a proper granulation process according to the common process parameters of the polypropylene, and performing melt extrusion granulation. In the extrusion granulation process, nitrogen is kept to be introduced into the hopper for pressurization, and the nitrogen gas curtain covering of the vent hole and the die opening is kept.
The regenerated polypropylene resin particles obtained by granulation have no yellowing and high transparency.
Example 4:
step 1: adding the recovered Polyester (PET) sheet raw material and related auxiliary agents into a specially-made hopper of a screw extruder, wherein the related auxiliary agents do not contain an antioxidant, closing the hopper, and performing operations of vacuumizing and filling dry nitrogen on the hopper under the stirring condition to remove oxygen. The operation flow of vacuumizing and charging dry nitrogen is repeated for 3 times until the oxygen in the hopper and in the gaps of the resin materials is completely removed.
Step 2: and opening nitrogen gas paths arranged at the positions where the insides of the machine barrels such as the exhaust hole of the screw machine barrel and the die opening of the machine head are communicated with the outside, so that the dry nitrogen gas flow forms a nitrogen gas curtain covering the exhaust hole and the die opening at the flow speed of 6 meters per second.
And step 3: the cylinder was charged with dry nitrogen gas, and the oxygen and moisture inside the cylinder were purged.
And 4, step 4: and opening a hopper blanking valve, opening a main machine of the screw extruder, setting and adjusting a proper granulation process according to the common process parameters of PET, and performing melt extrusion granulation. In the extrusion granulation process, dry nitrogen is introduced into the hopper to pressurize, and the exhaust holes and the die are covered by a nitrogen gas curtain.
The Polyester (PET) granules obtained by granulation have no yellowing phenomenon and high glossiness.
Example 5:
step 1: adding the recovered polypropylene flake raw material into a specially-made hopper of a screw extruder, closing the hopper without adding auxiliaries such as an antioxidant and the like, and vacuumizing and filling nitrogen into the hopper under the stirring condition to remove oxygen. The operation flow of vacuumizing and nitrogen filling is repeated for 3 times until the oxygen in the hopper and in the gaps of the resin materials is completely removed.
Step 2: and opening nitrogen gas paths arranged at the positions where the insides of the machine barrels, such as the exhaust holes of the machine barrel of the screw rod, the die opening of the machine head and the like, are communicated with the outside, so that nitrogen gas flow forms a nitrogen gas curtain covering the exhaust holes and the die opening at the flow speed of 6 meters per second.
And step 3: the cylinder was purged with nitrogen to discharge oxygen from the inside of the cylinder.
And 4, step 4: and opening a hopper blanking valve, opening a main machine of the screw extruder, setting and adjusting a proper forming process according to the common process parameters of the polypropylene, and performing melt extrusion on the regenerated sheet with the thickness of 4mm and the width of 50 mm. In the extrusion molding process, nitrogen is kept to be introduced into the hopper for pressurization, and the exhaust holes and the die opening are kept covered by a nitrogen gas curtain.
Preparing a mechanical property test standard sample from the sheet obtained by molding, testing the tensile strength according to GB/T1040-. The detection result shows that compared with the regenerated sheet prepared by the reference forming process (except that the full oxygen removal process is not adopted, other factors such as raw materials, extrusion process parameters and the like are completely consistent), the tensile strength of the regenerated sheet prepared by forming by adopting the full oxygen removal method is improved by 30%, and the impact strength is improved by 25%.
The foregoing is only a preferred embodiment of the present invention; the scope of the invention is not limited thereto. Any person skilled in the art should be able to cover the technical scope of the present invention by equivalent or modified solutions and modifications within the technical scope of the present invention.
Claims (3)
1. A high-temperature melt extrusion molding and granulation method of thermoplastic resin with sufficient oxygen removal is characterized by comprising the following steps:
1) adding a thermoplastic resin raw material into a hopper of a screw extruder, closing the hopper, performing operations of vacuumizing and filling nitrogen on the hopper under the stirring condition, removing oxygen, and repeating the operation processes of vacuumizing and filling nitrogen for 1-3 times until the oxygen in the hopper and in gaps of the resin material is completely removed.
2) Opening nitrogen gas paths arranged at the exhaust holes of the screw machine barrel, the die opening of the machine head and the position where the interior of the machine barrel is communicated with the outside, so that nitrogen gas flow forms a nitrogen gas curtain covering the exhaust holes and the die opening at the flow speed of 0.1-9 meters per second;
3) the cylinder was purged with nitrogen to discharge oxygen from the inside of the cylinder.
4) And opening a hopper discharging valve, opening a main machine of the screw extruder, performing melt extrusion molding and granulation, keeping the hopper filled with nitrogen for pressurization, and keeping the exhaust holes and the die orifice covered by a nitrogen gas curtain in the extrusion molding and granulation processes.
2. The method for high-temperature melt extrusion molding and pelletizing of the thermoplastic resin with sufficient oxygen removal capability according to claim 1, characterized in that:
the thermoplastic resin includes, but is not limited to, polypropylene, polyethylene, polyvinyl chloride, polystyrene, polyester, polyamide, polyurethane.
3. The method for high-temperature melt extrusion molding and pelletizing of the thermoplastic resin with sufficient oxygen removal capability according to claim 1, characterized in that:
the nitrogen gas curtain in the step 2) is formed by continuously sending nitrogen gas with a certain flow speed through a preset nitrogen pipeline nozzle, forming nitrogen gas coverage on the exhaust hole and the outside of the die orifice and cutting off a channel for air to diffuse into the machine barrel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210050567.4A CN114536583A (en) | 2022-01-17 | 2022-01-17 | Thermoplastic resin high-temperature melt extrusion molding and granulating method capable of sufficiently removing oxygen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210050567.4A CN114536583A (en) | 2022-01-17 | 2022-01-17 | Thermoplastic resin high-temperature melt extrusion molding and granulating method capable of sufficiently removing oxygen |
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| CN114536583A true CN114536583A (en) | 2022-05-27 |
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| CN202210050567.4A Pending CN114536583A (en) | 2022-01-17 | 2022-01-17 | Thermoplastic resin high-temperature melt extrusion molding and granulating method capable of sufficiently removing oxygen |
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Citations (7)
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|---|---|---|---|---|
| CN101208187A (en) * | 2005-06-27 | 2008-06-25 | 高级弹性体***两合公司 | Process for preparing thermoplastic elastomers by dynamic vulcanization |
| CN102781640A (en) * | 2011-02-09 | 2012-11-14 | 三菱工程塑料株式会社 | Process for production of polycarbonate resin pellets |
| US20130065053A1 (en) * | 2010-04-28 | 2013-03-14 | Wpc Corporation | Method for producing composite pellet for extrusion molding, and composite pellet for extrusion molding produced by the method |
| US20130147085A1 (en) * | 2011-12-09 | 2013-06-13 | E.I. Du Pont De Nemours And Company | One step production of polyvinyl chloride |
| CN104057554A (en) * | 2007-08-21 | 2014-09-24 | 株式会社日本触媒 | Process for production of acrylic resin pellet, and process for production of film |
| CN109337206A (en) * | 2018-10-11 | 2019-02-15 | 安庆市泽烨新材料技术推广服务有限公司 | Reinforced polypropylene compound material and preparation method thereof |
| CN113527845A (en) * | 2021-07-06 | 2021-10-22 | 漯河医学高等专科学校 | Full-biodegradable plastic component for laser welding |
-
2022
- 2022-01-17 CN CN202210050567.4A patent/CN114536583A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101208187A (en) * | 2005-06-27 | 2008-06-25 | 高级弹性体***两合公司 | Process for preparing thermoplastic elastomers by dynamic vulcanization |
| CN104057554A (en) * | 2007-08-21 | 2014-09-24 | 株式会社日本触媒 | Process for production of acrylic resin pellet, and process for production of film |
| US20130065053A1 (en) * | 2010-04-28 | 2013-03-14 | Wpc Corporation | Method for producing composite pellet for extrusion molding, and composite pellet for extrusion molding produced by the method |
| CN102781640A (en) * | 2011-02-09 | 2012-11-14 | 三菱工程塑料株式会社 | Process for production of polycarbonate resin pellets |
| US20130147085A1 (en) * | 2011-12-09 | 2013-06-13 | E.I. Du Pont De Nemours And Company | One step production of polyvinyl chloride |
| CN109337206A (en) * | 2018-10-11 | 2019-02-15 | 安庆市泽烨新材料技术推广服务有限公司 | Reinforced polypropylene compound material and preparation method thereof |
| CN113527845A (en) * | 2021-07-06 | 2021-10-22 | 漯河医学高等专科学校 | Full-biodegradable plastic component for laser welding |
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