CN116787731A - Flame-retardant polypropylene particle preparation molding device and method - Google Patents
Flame-retardant polypropylene particle preparation molding device and method Download PDFInfo
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- CN116787731A CN116787731A CN202310746043.3A CN202310746043A CN116787731A CN 116787731 A CN116787731 A CN 116787731A CN 202310746043 A CN202310746043 A CN 202310746043A CN 116787731 A CN116787731 A CN 116787731A
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- smelting
- preheating
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- -1 polypropylene Polymers 0.000 title claims abstract description 42
- 239000004743 Polypropylene Substances 0.000 title claims abstract description 36
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 36
- 239000003063 flame retardant Substances 0.000 title claims abstract description 31
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 239000002245 particle Substances 0.000 title claims abstract description 18
- 238000000465 moulding Methods 0.000 title claims abstract description 15
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 238000000034 method Methods 0.000 title claims description 19
- 238000003723 Smelting Methods 0.000 claims abstract description 136
- 239000002994 raw material Substances 0.000 claims abstract description 45
- 238000003756 stirring Methods 0.000 claims abstract description 41
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims description 51
- 238000007599 discharging Methods 0.000 claims description 36
- 239000000463 material Substances 0.000 claims description 19
- 238000003860 storage Methods 0.000 claims description 10
- 239000002270 dispersing agent Substances 0.000 claims description 9
- 239000000314 lubricant Substances 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 6
- 229920005989 resin Polymers 0.000 claims description 6
- 238000005469 granulation Methods 0.000 claims description 4
- 230000003179 granulation Effects 0.000 claims description 4
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 239000002202 Polyethylene glycol Substances 0.000 claims description 3
- 241001062472 Stokellia anisodon Species 0.000 claims description 3
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 3
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 3
- PFBWBEXCUGKYKO-UHFFFAOYSA-N ethene;n-octadecyloctadecan-1-amine Chemical compound C=C.CCCCCCCCCCCCCCCCCCNCCCCCCCCCCCCCCCCCC PFBWBEXCUGKYKO-UHFFFAOYSA-N 0.000 claims description 3
- 229930195729 fatty acid Natural products 0.000 claims description 3
- 239000000194 fatty acid Substances 0.000 claims description 3
- 150000004665 fatty acids Chemical class 0.000 claims description 3
- ZQKXQUJXLSSJCH-UHFFFAOYSA-N melamine cyanurate Chemical compound NC1=NC(N)=NC(N)=N1.O=C1NC(=O)NC(=O)N1 ZQKXQUJXLSSJCH-UHFFFAOYSA-N 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 229920001223 polyethylene glycol Polymers 0.000 claims description 3
- 239000000052 vinegar Substances 0.000 claims description 3
- 235000021419 vinegar Nutrition 0.000 claims description 3
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 claims description 3
- 229910000166 zirconium phosphate Inorganic materials 0.000 claims description 3
- LEHFSLREWWMLPU-UHFFFAOYSA-B zirconium(4+);tetraphosphate Chemical compound [Zr+4].[Zr+4].[Zr+4].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LEHFSLREWWMLPU-UHFFFAOYSA-B 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims 1
- 239000008187 granular material Substances 0.000 claims 1
- 238000010030 laminating Methods 0.000 claims 1
- 238000002844 melting Methods 0.000 description 9
- 230000008018 melting Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/02—Conditioning or physical treatment of the material to be shaped by heating
- B29B13/022—Melting the material to be shaped
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/285—Feeding the extrusion material to the extruder
- B29C48/287—Raw material pre-treatment while feeding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/285—Feeding the extrusion material to the extruder
- B29C48/29—Feeding the extrusion material to the extruder in liquid form
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/10—Polymers of propylene
- B29K2023/12—PP, i.e. polypropylene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/328—Phosphates of heavy metals
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The application discloses a flame-retardant polypropylene particle preparation molding device, which comprises a smelting cavity and an external filling device, wherein a fixed heating plate is arranged on the inner wall of the smelting cavity, a rotatable stirring shaft is arranged in the smelting cavity, the stirring shaft is controlled to rotate by an external stirring driving piece, the bottom of the smelting cavity is provided with a discharge hole, and a discharge device for controlling the conduction and the closing of the discharge hole is arranged at the discharge hole; the preheating device is characterized in that a preheating cavity communicated with an external filling device is arranged in the smelting cavity, and a pushing device is arranged in the preheating cavity and can push raw materials in the preheating cavity into the smelting cavity. According to the application, the preheating cavity is arranged in the smelting cavity, the raw materials are buffered in the preheating cavity before entering the smelting cavity, the preheating cavity receives redundant heat in the smelting cavity to heat and preheat the raw materials to be smelted in the preheating cavity, and the preheated raw materials are heated to the required smelting temperature after being put into the smelting cavity, so that the smelting time is reduced, and the production efficiency is improved.
Description
Technical Field
The application relates to the technical field of polypropylene particle manufacturing, in particular to a flame-retardant polypropylene particle preparation molding device and method.
Background
Polypropylene has a wide application range due to its excellent corrosion resistance, heat resistance, electrical insulation, high strength mechanical properties and good high abrasion resistance processability, but the melting point of polypropylene is about 189 ℃ which is a flammable material, and in order to enhance the flame retardance of polypropylene, the flame retardance level of polypropylene is usually improved by adding a certain proportion of flame retardant when producing polypropylene.
The common smelting method is to manually mix various raw materials according to a planned proportion and then inject the raw materials into a hot melting barrel with heating and stirring functions, and the generated mixture is injected into a granulator for granulation after a period of stirring and hot melting.
In the process, the time is needed for extracting the mixture from the hot-melting barrel to the granulator and then refilling new raw materials, the heat of the hot-melting barrel does not heat the raw materials in the process, so that the heat waste in the hot-melting barrel is caused, if the heating is stopped at the stage, the temperature in the hot-melting barrel is reduced, the time for reheating is needed, the time for the whole smelting stage is prolonged, the production efficiency is reduced, and in addition, the new raw materials lack to be preheated after being filled into the hot-melting barrel, the longer heating time is needed for melting, and the production efficiency is also reduced.
Disclosure of Invention
The application aims to provide a device and a method for preparing and forming flame-retardant polypropylene particles, which are used for solving the technical problems of lower heat utilization rate and longer smelting time in the raw material smelting process in the prior art.
In order to solve the technical problems, the application specifically provides the following technical scheme:
the application provides a flame-retardant polypropylene particle preparation molding device, which comprises a smelting cavity and an external filling device, wherein a fixed heating plate is arranged on the inner wall of the smelting cavity, a rotatable stirring shaft is arranged in the smelting cavity, the stirring shaft is controlled to rotate by an external stirring driving piece, the bottom of the smelting cavity is provided with a discharge hole, and a discharge device for controlling the conduction and the closing of the discharge hole is arranged at the discharge hole;
a preheating cavity communicated with an external filling device is arranged in the smelting cavity, a pushing device is arranged in the preheating cavity, and the pushing device can push raw materials in the preheating cavity into the smelting cavity;
the raw materials are input into the smelting cavity according to the proportion, the heating plate in the smelting cavity is electrified to generate thermal effect to smelt the mixed raw materials in the heating plate, and meanwhile, the stirring driving piece outside drives the stirring shaft to synchronously rotate, so that the raw materials are fully mixed for reaction;
while smelting and reacting the raw materials, adding the other part of raw materials mixed according to a proportion into the preheating cavity, preheating and heating the mixture in the preheating cavity by the heat in the smelting cavity, discharging the mixture from the discharge port through the discharge device after a period of smelting and reacting into external granulating equipment for granulating, and closing the discharge port after the mixture in the smelting cavity is completely discharged;
and then the pushing device guides the preheated mixture in the preheating cavity into the smelting cavity for a new round of smelting, and after the mixture in the preheating cavity is completely led out, the filling device performs filling on the preheating cavity again, so that the next wave of material is preheated, and the cycle is performed.
As a preferable scheme of the application, the side wall of the smelting cavity is arc-shaped, and has a guiding function of converging materials in the smelting cavity to the middle of the bottom surface;
the material outlet is arranged in the middle of the bottom surface of the smelting cavity, so that when the material outlet is opened, the materials in the smelting cavity can flow out from the material outlet as much as possible under the guide action of self gravity and the side wall of the smelting cavity.
As a preferable scheme of the application, the preheating cavity is a cylindrical cavity and is positioned in the middle of the smelting cavity, the top of the preheating cavity is fixed with the inner wall of the smelting cavity, and the bottom of the preheating cavity is suspended and does not contact the bottom of the smelting cavity.
As a preferable scheme of the application, the filling device comprises a plurality of storage boxes fixed at the top of the device, each storage box is filled with and stores only one required raw material, and the storage boxes are communicated with the top of the preheating cavity through a feeding pipeline;
a feeding dragon is arranged in the feeding pipeline, and the feeding dragon is controlled to rotate through a feeding motor at the tail end of the feeding dragon, and the rotation speeds of the feeding dragon in different feeding pipelines are different;
wherein, through the control different the rotational speed of feed flood dragon, and then the input proportion of control different raw materials.
As a preferable scheme of the application, the pushing device comprises a piston with a side part attached to the inner wall of the preheating cavity and an electric telescopic rod arranged at the top of the preheating cavity, wherein the top of the electric telescopic rod is fixedly connected with the middle part of the surface of the piston, and a discharge hole is arranged at the side part of the top of the preheating cavity;
when the preheating cavity is in the preheating stage, the piston is positioned at the bottom of the preheating cavity, a preheating space is formed by the upper surface of the piston and the inner wall of the preheating cavity, and the mixture is positioned in the preheating space;
when the preheating cavity needs to discharge materials into the smelting cavity, the end part of the electric telescopic rod drives the piston to move upwards to the vicinity of the discharge hole, the volume of the preheating space is gradually reduced in the process, and the mixture above the piston overflows from the discharge hole and enters the smelting cavity;
when all the mixture in the preheating cavity is discharged into the smelting cavity, the electric telescopic rod is stretched again and drives the piston to return to the bottom of the preheating cavity again, and then the filling device fills the preheating cavity again.
As a preferable scheme of the application, an infrared sensor is arranged on the inner wall below the discharge hole at the top of the preheating cavity, a plurality of feeding motors of the infrared sensor are all electrically connected, and after the height of the mixture in the preheating cavity reaches the horizontal position of the infrared sensor, the infrared sensor sends a stopping signal to each feeding motor, and all the feeding motors and the feeding dragon driven by the same stop rotating, namely stop feeding.
As a preferable scheme of the application, the bottom of the preheating cavity is of a hollow structure, the bottom end of the preheating cavity is provided with an annular bottom edge protruding towards the middle, and the lower surface of the piston is attached to the bottom edge when the piston is positioned at the lowest end of the preheating cavity.
As a preferable scheme of the application, the stirring driving piece comprises a rotating ring which is rotationally connected with the side part of the smelting cavity, and the stirring shaft is provided with a plurality of stirring shafts which are fixedly connected with the inner side of the rotating ring and are distributed in an annular array;
the outside of the rotating ring is positioned outside the smelting cavity and is in a tooth-shaped structure, a gear motor is arranged on the side part of the smelting cavity, and the gear motor is meshed with the rotating ring through a gear and drives the rotating ring to rotate.
As a preferable scheme of the application, the discharging device comprises a discharging motor and a spherical discharging valve fixedly connected with a rotating shaft of the discharging motor, and a linear discharging channel is arranged in the discharging valve;
when the discharging channel rotates to a vertical state, the top of the discharging channel is communicated with the bottom of the discharging port and is communicated with an input port of an external granulating device, so that the discharging port is in a conducting state, and the mixture converged at the discharging port passes through the discharging channel and enters the external granulating device under the action of self gravity;
after the discharging is finished, the discharging valve rotates by a certain amplitude, so that the port of the discharging channel deviates from the discharging port and then returns to the sealing state of the discharging port.
In a second aspect of the present application, there is provided a method for producing flame retardant polypropylene comprising the steps of:
step 1: preparing polypropylene resin, a flame retardant, a dispersing agent and a lubricant into a mixture according to a certain proportion;
according to the weight portion, the polypropylene resin is 70-90 parts, the flame retardant is 5-7 parts, the dispersing agent is 3-5 parts, and the lubricant is 4-7 parts;
in addition, the flame retardant component is one or more of melamine-cyanurate and zirconium phosphate, the dispersing agent component is one or more of polypropylene hydroxylamine, fatty acid polyethylene glycol vinegar and triethanolamine, and the lubricant is one or more of polypropylene wax, zinc stearate, ethylene bis-stearylamine and polyethylene wax;
step two: putting the mixture obtained in the step one into the smelting cavity for stirring smelting;
wherein the smelting temperature is 170-200 ℃, and the stirring and smelting time is 20-30min;
step three: and (3) putting the smelted mixture obtained in the step (II) into a double-screw extruder for extrusion granulation, wherein the extrusion temperature is 150-220 ℃ and the screw rotating speed is 300r/min.
Compared with the prior art, the application has the following beneficial effects:
according to the application, the preheating cavity is arranged in the smelting cavity, the raw materials are cached in the preheating cavity before entering the smelting cavity, the preheating cavity receives redundant heat in the smelting cavity to heat and preheat the raw materials to be smelted in the preheating cavity, and the preheated raw materials are heated to the required smelting temperature after being thrown into the smelting cavity, so that the smelting time is reduced, and the production efficiency is improved; on the other hand, in the feeding and discharging stage of the smelting cavity, the residual temperature part in the smelting cavity is used for maintaining or increasing the temperature of the raw materials in the preheating cavity, so that the overall heat utilization rate of the device is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those of ordinary skill in the art that the drawings in the following description are exemplary only and that other implementations can be obtained from the extensions of the drawings provided without inventive effort.
FIG. 1 is an external view of the present application;
FIG. 2 is an internal cross-sectional view of the present application;
FIG. 3 is a flow chart of a method for producing the flame retardant polypropylene according to the present application;
reference numerals in the drawings are respectively as follows:
1-smelting cavity, 2-packing device, 3-heating plate, 4-stirring shaft, 5-stirring driving piece, 6-discharging device, 7-preheating cavity, 8-pushing device, 9-infrared sensor, 11-discharge port, 21-storage box, 22-feeding pipeline, 23-feeding dragon, 24-feeding motor, 51-rotating ring, 52-gear motor, 61-discharging motor, 62-discharging valve, 71-discharge port, 72-bottom edge, 81-piston, 82-electric telescopic rod and 621-discharging channel.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
As shown in fig. 1-2, the application provides a flame-retardant polypropylene particle preparation molding device, which comprises a smelting cavity 1 and an external packing device 2, wherein a fixed heating plate 3 is arranged on the inner wall of the smelting cavity 1, a rotatable stirring shaft 4 is arranged in the smelting cavity 1, the stirring shaft 4 is controlled to rotate by an external stirring driving piece 5, the bottom of the smelting cavity 1 is provided with a discharge opening 11, and a discharge device 6 for controlling the conduction and the closing of the discharge opening 11 is arranged at the discharge opening 11;
a preheating cavity 7 communicated with the external filling device 2 is arranged in the smelting cavity 1, a pushing device 8 is arranged in the preheating cavity 7, and the pushing device 8 can push raw materials in the preheating cavity 7 into the smelting cavity 1;
the raw materials are input into the smelting cavity 1 according to the proportion, a heating plate 3 in the smelting cavity 1 is electrified to generate thermal effect to smelt the mixed raw materials in the smelting cavity, and meanwhile, an external stirring driving piece 5 drives a stirring shaft 4 to synchronously rotate, so that the raw materials are fully mixed and reacted;
while smelting and reacting the raw materials, the raw materials mixed according to the proportion are put into a preheating cavity 7, the preheating cavity 7 receives heat in the smelting cavity 1 to preheat and heat the mixture in the preheating cavity, after a period of smelting and reacting, the mixture is discharged from a discharge port 11 through a discharge device 6 and enters external granulating equipment for granulating, and when the mixture in the smelting cavity 1 is completely discharged, the discharge port 11 is closed;
the pushing device 8 then guides the preheated mixture in the preheating cavity 7 into the smelting cavity 1 for a new round of smelting, and after the mixture in the preheating cavity 7 is completely led out, the filling device 2 performs filling again on the preheating cavity 7, and then performs preheating on the next wave of material, so that the cycle is performed.
Considering the discharge problem of the mixture after smelting in the smelting chamber 1.
Furthermore, the side wall of the smelting cavity 1 is arc-shaped, and has a guiding function of converging materials in the smelting cavity towards the middle of the bottom surface;
the discharge hole 11 is formed in the middle of the bottom surface of the smelting cavity 1, so that when the discharge hole 11 is opened, materials in the smelting cavity 1 can flow out from the discharge hole 11 as many as possible under the self gravity and the guiding action of the side wall of the smelting cavity 1.
Further, the preheating cavity 7 is a cylindrical cavity and is positioned in the middle of the smelting cavity 1, the top of the preheating cavity is fixed with the inner wall of the smelting cavity 1, and the bottom of the preheating cavity is suspended and does not contact with the bottom of the smelting cavity 1.
The columnar preheating cavity 7 at the middle part of the smelting cavity 1 can exchange heat with air in the smelting cavity 1 and the smelted mixture, so that the heat exchange efficiency is improved, and in addition, the fact that the discharge port 11 is arranged at the middle of the bottom of the smelting cavity 1 and below the preheating cavity 7 due to the requirement of convenient discharge is considered, the bottom of the preheating cavity 7 is suspended and does not interfere with the discharge port 11, the bottom of the suspended preheating cavity 7 can receive the heat of the mixture in the smelting process, and the heat is not exchanged with the inner wall of the smelting cavity 1 after the smelting cavity 1 is emptied, so that the heat preservation performance of the preheating cavity 7 is improved.
On the other hand, in order to save the time of preparing the mixture by saving the proportion of each raw material, the device further improves the accuracy of the proportion of each raw material in the mixture.
Further, the filling device 2 comprises a plurality of storage tanks 21 fixed on the top of the device, each storage tank 21 is filled with and stores only one needed raw material, and the plurality of storage tanks 21 are communicated with the top of the preheating cavity 7 through a feeding pipeline 22;
a feeding dragon 23 is arranged in the feeding pipeline 22, the feeding dragon 23 is controlled to rotate by a feeding motor 24 at the tail end of the feeding dragon 23, and the rotation speeds of the feeding dragon 23 in different feeding pipelines 22 are different;
wherein the input proportion of different raw materials is further controlled by controlling the rotation speed of different feeding dragon 23.
So the worker only needs to throw corresponding raw materials into the corresponding stock box 21, and sets the rotation speed of different feeding motors 24 according to the required proportion of different raw materials, so that the automatic timing feeding into the preheating cavity 7 can be realized.
Considering that the mixture in the preheating cavity 7 needs to be discharged into the smelting cavity 1, if the mixture is directly released from the bottom of the preheating cavity 7, the mixture in the preheating cavity 7 can be prevented from being released from the top of the preheating cavity 7 when the liquid level of the mixture in the smelting cavity 1 reaches the bottom end height of the preheating cavity 7.
Further, the pushing device 8 comprises a piston 81 with a side part attached to the inner wall of the preheating cavity 7 and an electric telescopic rod 82 arranged at the top of the preheating cavity 7, the top of the electric telescopic rod 82 is fixedly connected with the middle part of the surface of the piston 81, and a discharge hole 71 is arranged at the side part of the top of the preheating cavity 7;
when the preheating cavity 7 is in the preheating stage, the piston 81 is positioned at the bottom of the preheating cavity 7, a preheating space is formed by the upper surface of the piston 81 and the inner wall of the preheating cavity 7, and the mixture is positioned in the preheating space;
when the preheating cavity 7 needs to discharge materials into the smelting cavity 1, the end part of the electric telescopic rod 82 drives the piston 81 to move upwards to the vicinity of the discharge hole 71, the volume of the preheating space is gradually reduced in the process, and the mixture above the piston 81 overflows from the discharge hole 71 and enters the smelting cavity 1;
when the mixture in the preheating chamber 7 is completely discharged into the smelting chamber 1, the electric telescopic rod 82 is stretched again and drives the piston 81 to return to the bottom of the preheating chamber 7 again, and then the filling device 2 fills the preheating chamber 7 again.
It is furthermore considered that the filling device 2 is stopped after sufficient raw material has been filled in the preheating chamber 7.
Further, the inner wall below the discharge hole 71 at the top of the preheating cavity 7 is provided with an infrared sensor 9, a plurality of feeding motors 24 of the infrared sensor 9 are all electrically connected, when the height of the mixture in the preheating cavity 7 reaches the horizontal position of the infrared sensor 9, the infrared sensor 9 sends a stall signal to each feeding motor 24, and all the feeding motors 24 and the feeding screw conveyer 23 driven by the same stop rotating, namely stop feeding.
Considering that when the piston 81 moves in the preheating chamber 7, if the position is above the communication point between each feed pipe 22 and the preheating chamber 7, there may be a raw material falling into the preheating chamber 7 below the piston 81 at the communication point between each feed pipe 22 and the preheating chamber 7, which may inhibit the return stroke of the piston 81.
Further, the bottom of the preheating cavity 7 is in a hollow structure, the bottom end of the preheating cavity is provided with an annular bottom edge 72 protruding towards the middle, and the lower surface of the piston 81 is attached to the bottom edge 72 when the piston 81 is positioned at the lowest end of the preheating cavity 7.
The raw material thus falling into the preheating chamber 7 below the piston 81 will directly enter the smelting chamber 1 without impeding the movement of the piston 81.
Further, the stirring driving piece 5 comprises a rotating ring 51 rotationally connected with the side part of the smelting cavity 1, and the stirring shaft 4 is provided with a plurality of stirring shafts fixedly connected with the inner sides of the rotating ring 51 and distributed in an annular array;
the outer side of the rotating ring 51 is positioned outside the smelting cavity 1 and is in a tooth-shaped structure, a gear motor 52 is arranged on the side part of the smelting cavity 1, and the gear motor 52 is meshed through a gear and drives the rotating ring 51 to rotate.
In this device (4) stirring shaft annular arrangement with preheat the space between chamber (7) and the smelting chamber (1) lateral wall, the drive at gear motor (52) and rotation ring (51) has reached the stirring effect around the vertical axis rotation in center of smelting chamber (1), and the shaft body of stirring shaft (4) can be designed to the same radian with smelting chamber (1) inner wall and then reaches better stirring effect.
Further, the discharging device 6 comprises a discharging motor 61 and a spherical discharging valve 62 fixedly connected with a rotating shaft of the discharging motor 61, and a linear discharging channel 621 is arranged in the discharging valve 62;
when the discharge channel 621 rotates to a vertical state, the top of the discharge channel 621 is communicated with the bottom of the discharge port 11 and is communicated with an input port of an external granulating device, so that the discharge port 11 is in a conducting state, and the mixture converged at the position of the discharge port 11 passes through the discharge channel 621 to enter the external granulating device under the action of self gravity;
after the discharge is finished, the discharge valve 62 rotates by a certain extent, so that the port of the discharge channel 621 deviates from the discharge port 11 and returns to the closed state of the discharge port 11.
The whole structure of the discharging device 6 is simple and easy to realize, and the operation is correspondingly quick and convenient.
As shown in fig. 3, in a second aspect of the present application, there is provided a method for producing flame retardant polypropylene comprising the steps of:
step 1: preparing polypropylene resin, a flame retardant, a dispersing agent and a lubricant into a mixture according to a certain proportion;
according to the weight portion, the polypropylene resin is 70-90 parts, the flame retardant is 5-7 parts, the dispersing agent is 3-5 parts, and the lubricant is 4-7 parts;
in addition, the flame retardant component is one or more of melamine-cyanurate and zirconium phosphate, the dispersing agent component is one or more of polypropylene hydroxylamine, fatty acid polyethylene glycol vinegar and triethanolamine, and the lubricant is one or more of polypropylene wax, zinc stearate, ethylene bis-stearylamine and polyethylene wax;
step two: putting the mixture obtained in the step one into a smelting cavity for stirring smelting;
wherein the smelting temperature is 170-200 ℃, and the stirring and smelting time is 20-30min;
step three: and (3) putting the smelted mixture obtained in the step (II) into a double-screw extruder for extrusion granulation, wherein the extrusion temperature is 150-220 ℃ and the screw rotating speed is 300r/min.
The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application, the scope of which is defined by the claims. Various modifications and equivalent arrangements of this application will occur to those skilled in the art, and are intended to be within the spirit and scope of the application.
Claims (10)
1. The utility model provides a fire-retardant polypropylene granule preparation forming device which characterized in that:
the automatic feeding device comprises a smelting cavity (1) and an external filling device (2), wherein a fixed heating plate (3) is arranged on the inner wall of the smelting cavity (1), a rotatable stirring shaft (4) is arranged in the smelting cavity (1), the stirring shaft (4) is controlled to rotate by an external stirring driving piece (5), a discharge opening (11) is arranged at the bottom of the smelting cavity (1), and a discharge device (6) for controlling the conduction and the closing of the discharge opening (11) is arranged at the discharge opening (11);
a preheating cavity (7) communicated with the external filling device (2) is arranged in the smelting cavity (1), a pushing device (8) is arranged in the preheating cavity (7), and the pushing device (8) can push raw materials in the preheating cavity (7) into the smelting cavity (1);
the raw materials are input into the smelting cavity (1) according to the proportion, the heating plate (3) in the smelting cavity (1) is electrified to generate thermal effect to smelt the mixed raw materials in the heating plate, and meanwhile the stirring driving piece (5) outside drives the stirring shaft (4) to synchronously rotate, so that the raw materials are fully mixed and reacted;
while smelting and reacting the raw materials, the other part of raw materials mixed according to the proportion are put into the preheating cavity (7), the preheating cavity (7) receives heat in the smelting cavity (1) to preheat and heat the mixture in the preheating cavity, after a period of smelting and reacting, the mixture is discharged from the discharge port (11) through the discharge device (6) and enters external granulating equipment to be granulated, and after all the mixture in the smelting cavity (1) is discharged, the discharge port (11) is closed;
and then the pushing device (8) guides the preheated mixture in the preheating cavity (7) into the smelting cavity (1) for a new round of smelting, and after the mixture in the preheating cavity (7) is completely led out, the filling device (2) performs filling on the preheating cavity (7) again, so that the next wave of material is preheated, and the cycle is performed.
2. The flame retardant polypropylene particle production molding apparatus according to claim 1, wherein:
the side wall of the smelting cavity (1) is arc-shaped, and has a guiding effect on the materials in the smelting cavity converging towards the middle of the bottom surface;
the material outlet (11) is arranged in the middle of the bottom surface of the smelting cavity (1), so that when the material outlet (11) is opened, materials in the smelting cavity (1) can flow out from the material outlet (11) as much as possible under the self gravity and the guiding action of the side wall of the smelting cavity (1).
3. The flame retardant polypropylene particle preparation molding device and method according to claim 2, wherein:
the preheating cavity (7) is a cylindrical cavity and is positioned in the middle of the smelting cavity (1), the top of the preheating cavity is fixed with the inner wall of the smelting cavity (1), and the bottom of the preheating cavity is suspended and does not contact the bottom of the smelting cavity (1).
4. The flame retardant polypropylene particle preparation molding device and method according to claim 3, wherein:
the filling device (2) comprises a plurality of storage boxes (21) fixed at the top of the device, each storage box (21) is only filled with and stores one required raw material, and the storage boxes (21) are communicated with the top of the preheating cavity (7) through a feeding pipeline (22);
a feeding dragon (23) is arranged in the feeding pipeline (22), the feeding dragon (23) is controlled to rotate through a feeding motor (24) at the tail end of the feeding dragon, and the rotating speeds of the feeding dragon (23) in different feeding pipelines (22) are different;
wherein the input proportion of different raw materials is controlled by controlling the rotating speed of different feeding dragon (23).
5. The device and method for preparing and molding flame-retardant polypropylene particles according to claim 4, wherein:
the pushing device (8) comprises a piston (81) with the side part attached to the inner wall of the preheating cavity (7) and an electric telescopic rod (82) arranged at the top of the preheating cavity (7), the top of the electric telescopic rod (82) is fixedly connected with the middle part of the surface of the piston (81), and a discharge hole (71) is formed in the side part of the top of the preheating cavity (7);
when the preheating cavity (7) is in the preheating stage, the piston (81) is positioned at the bottom of the preheating cavity (7), a preheating space is formed by the upper surface of the piston (81) and the inner wall of the preheating cavity (7), and the mixture is positioned in the preheating space;
when the preheating cavity (7) needs to discharge materials into the smelting cavity (1), the end part of the electric telescopic rod (82) drives the piston (81) to move upwards to the vicinity of the discharge hole (71), the volume of a preheating space is gradually reduced in the process, and the mixture above the piston (81) overflows from the discharge hole (71) and enters the smelting cavity (1);
when all the mixture in the preheating cavity (7) is discharged into the smelting cavity (1), the electric telescopic rod (82) is stretched again and drives the piston (81) to return to the bottom of the preheating cavity (7), and then the filling device (2) fills the preheating cavity (7) again.
6. The device and method for preparing and molding flame-retardant polypropylene particles according to claim 5, wherein:
the utility model discloses a feed screw conveyer, including preheating chamber (7), discharge gate (71) below inner wall at top is equipped with infrared inductor (9), infrared inductor (9) a plurality of feed motor (24) all establish electric connection, work as after the mixture height in preheating chamber (7) reaches behind the horizontal position of infrared inductor (9), infrared inductor (9) to each feed motor (24) sends stall signal, all feed motor (24) and driven feed flood dragon (23) stop rotating, stop the pay-off promptly.
7. The device and method for preparing and molding flame-retardant polypropylene particles according to claim 6, wherein:
the bottom of preheating chamber (7) is hollow out construction, and the bottom is equipped with annular base (72) that are outstanding to the middle part, piston (81) are located when preheating chamber (7) the extreme low its lower surface laminating base (72).
8. The flame retardant polypropylene particle preparation molding device and method according to claim 1, wherein:
the stirring driving piece (5) comprises a rotating ring (51) which is rotationally connected with the side part of the smelting cavity (1), and the stirring shaft (4) is provided with a plurality of stirring shafts which are fixedly connected with the inner side of the rotating ring (51) and are distributed in an annular array;
the outside of the rotating ring (51) is positioned outside the smelting cavity (1) and is of a tooth-shaped structure, a gear motor (52) is arranged on the side part of the smelting cavity (1), and the gear motor (52) is meshed through a gear and drives the rotating ring (51) to rotate.
9. The flame retardant polypropylene particle preparation molding device and method according to claim 1, wherein:
the discharging device (6) comprises a discharging motor (61) and a spherical discharging valve (62) fixedly connected with a rotating shaft of the discharging motor (61), and a linear discharging channel (621) is arranged in the discharging valve (62);
when the discharge channel (621) rotates to a vertical state, the top of the discharge channel is communicated with the bottom of the discharge port (11) and is communicated with an input port of an external granulating device, so that the discharge port (11) is in a conducting state, and the mixture converged at the discharge port (11) passes through the discharge channel (621) to enter the external granulating device under the action of self gravity;
after the discharge is finished, the discharge valve (62) rotates by a certain amplitude, so that the port of the discharge channel (621) deviates from the discharge port (11) to restore the closed state of the discharge port (11).
10. A method for producing flame retardant polypropylene particles based on a flame retardant polypropylene particle production molding apparatus according to any one of claims 1 to 9, comprising the steps of:
step 1: preparing polypropylene resin, a flame retardant, a dispersing agent and a lubricant into a mixture according to a certain proportion;
according to the weight portion, the polypropylene resin is 70-90 parts, the flame retardant is 5-7 parts, the dispersing agent is 3-5 parts, and the lubricant is 4-7 parts;
in addition, the flame retardant component is one or more of melamine-cyanurate and zirconium phosphate, the dispersing agent component is one or more of polypropylene hydroxylamine, fatty acid polyethylene glycol vinegar and triethanolamine, and the lubricant is one or more of polypropylene wax, zinc stearate, ethylene bis-stearylamine and polyethylene wax;
step two: putting the mixture obtained in the step one into the smelting cavity for stirring smelting;
wherein the smelting temperature is 170-200 ℃, and the stirring and smelting time is 20-30min;
step three: and (3) putting the smelted mixture obtained in the step (II) into a double-screw extruder for extrusion granulation, wherein the extrusion temperature is 150-220 ℃ and the screw rotating speed is 300r/min.
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