CN113459466A - Production device and process for online reinforcing polypropylene material by using continuous long fibers - Google Patents
Production device and process for online reinforcing polypropylene material by using continuous long fibers Download PDFInfo
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- CN113459466A CN113459466A CN202110710083.3A CN202110710083A CN113459466A CN 113459466 A CN113459466 A CN 113459466A CN 202110710083 A CN202110710083 A CN 202110710083A CN 113459466 A CN113459466 A CN 113459466A
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- 239000004743 Polypropylene Substances 0.000 title claims abstract description 93
- -1 polypropylene Polymers 0.000 title claims abstract description 77
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- 239000000463 material Substances 0.000 title claims abstract description 65
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000008569 process Effects 0.000 title claims abstract description 16
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 14
- 238000001746 injection moulding Methods 0.000 claims abstract description 39
- 238000001125 extrusion Methods 0.000 claims abstract description 38
- 239000006185 dispersion Substances 0.000 claims abstract description 30
- 238000002347 injection Methods 0.000 claims abstract description 14
- 239000007924 injection Substances 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims description 22
- 239000000203 mixture Substances 0.000 claims description 19
- 239000012752 auxiliary agent Substances 0.000 claims description 17
- 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 claims description 14
- 239000003963 antioxidant agent Substances 0.000 claims description 14
- 230000003078 antioxidant effect Effects 0.000 claims description 14
- 239000004595 color masterbatch Substances 0.000 claims description 14
- 229920001971 elastomer Polymers 0.000 claims description 14
- 239000000806 elastomer Substances 0.000 claims description 14
- 239000003063 flame retardant Substances 0.000 claims description 14
- 239000003365 glass fiber Substances 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 9
- 229920002748 Basalt fiber Polymers 0.000 claims description 5
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 5
- 239000004917 carbon fiber Substances 0.000 claims description 5
- 239000011295 pitch Substances 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 230000002787 reinforcement Effects 0.000 claims description 2
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- 238000012545 processing Methods 0.000 abstract description 3
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Classifications
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- 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
- B29C48/0013—Extrusion moulding in several steps, i.e. components merging outside the die
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2701—Details not specific to hot or cold runner channels
- B29C45/2708—Gates
-
- 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
- B29C48/288—Feeding the extrusion material to the extruder in solid form, e.g. powder or granules
- B29C48/2886—Feeding the extrusion material to the extruder in solid form, e.g. powder or granules of fibrous, filamentary or filling materials, e.g. thin fibrous reinforcements or fillers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
- B29C48/397—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using a single screw
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
- B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- 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
- B29C48/92—Measuring, controlling or regulating
-
- 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
- B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
- B29C69/02—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore of moulding techniques only
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
Abstract
The invention relates to a production device for on-line reinforcing polypropylene material by using continuous long fiber, comprising: the device comprises a primary screw extruder, a secondary screw extruder, an extrusion injection type injection molding system, a mold locking system and a sequential dispersion frame, wherein the primary screw extruder is provided with a feed hopper, a first feed port of the secondary screw extruder is connected with an extrusion port die of the primary screw extruder, the extrusion injection type injection molding system is connected with the extrusion port die of the secondary screw extruder, the mold locking system is connected with the extrusion injection type injection molding system, the sequential dispersion frame is arranged at a second feed port of the secondary screw extruder, and fibers enter the secondary screw extruder from the second feed port after passing through the sequential dispersion frame; when the polypropylene material is produced, continuous uncut long fibers are orderly input into the second feed port of the secondary double-screw extruder, so that the problems of high energy consumption and short fiber length in the reinforced polypropylene material in the process of processing the long fibers twice are effectively solved, and the obtained polypropylene material has obviously increased performance indexes.
Description
Technical Field
The invention relates to the technical field of preparation of polypropylene materials, in particular to a production device and a production process for on-line reinforcing of a polypropylene material by using continuous long fibers.
Background
Long fiber reinforced polypropylene is a high strength, lightweight composite material, and the fibers used as the starting material are usually in the form of long continuous fibers, and when used as the material starting material, the continuous long fibers must be cut into short fibers for use. Typically, the fiber length in fiber reinforced materials (SFT) is typically 0.2-0.4 mm, while in LFT the fiber length is typically greater than 2 mm, and can even be kept above 5 mm. In the existing production process of long fiber reinforced polypropylene materials, long fiber pellets (with the length of 2-3 mm) are processed firstly, and then products are processed through double-screw injection molding equipment, the production process is high in production energy consumption, the fiber length of the long fiber pellets is shortened after secondary processing, and the situation that fibers and a polypropylene molten polymer are kneaded unevenly is avoided, the reinforcing performance of the materials is not obvious, the mechanical property of the polypropylene materials cannot be really and effectively improved, the application range of the products is limited, and a PC mixture after melting in the process is used as a middle semi-finished product and needs heat preservation and conveying, so that an intermediate link is increased, the production efficiency is reduced, and the production energy consumption is increased. Therefore, it is necessary to develop a new method for preparing polypropylene materials.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a production device and a production process for on-line reinforcing a polypropylene material by using continuous long fibers.
In order to realize the purpose, the invention discloses the following technical scheme:
firstly, the invention discloses a device for producing a polypropylene material by utilizing continuous long fibers for online reinforcement, which comprises: the injection molding machine comprises a first-stage screw extruder, a second-stage double-screw extruder, an extrusion injection molding system, a mold locking system and a sequential dispersion frame, wherein the first-stage screw extruder is provided with a feed hopper, a first feed inlet of the second-stage double-screw extruder is connected with an extrusion port mold of the first-stage screw extruder, the extrusion injection molding system is connected with the extrusion port mold of the second-stage double-screw extruder, and the mold locking system is connected with the extrusion injection molding system.
The sequential dispersing frame comprises a dispersing frame shell and a fiber air conveying channel horizontally arranged in the dispersing frame shell, the shape of the fiber air conveying channel is W-shaped, a plurality of fiber conveying ports are formed in the fiber air conveying channel, the fiber conveying ports are used for conveying continuous uncut long fibers, and the length of the fibers in the polypropylene material reaches 30 mm; the sequential dispersion frame is arranged at a second feed port of the secondary double-screw extruder, and the long fibers pass through the sequential dispersion frame and then enter the secondary double-screw extruder from the second feed port.
The second feed inlet is arranged in a tearing area of the second-stage screw, so that the fiber carried by the screw cannot be torn, and the fiber is only mixed with other raw materials, so that the fiber length can be kept as large as possible.
The invention discovers in the test process that: the traditional fiber is sheared outside an extruder and then mixed with other raw materials, and in the mixing process, the sheared fiber can be damaged again under the action of a screw rod when passing through a tearing area, so that the fiber length in the finally obtained product is far from meeting the requirement, and therefore, the invention adopts two aspects of design to solve the problems: firstly, the fibers are not sheared before entering the extruder, but are directly added into the extruder, so that the integrity of the fibers can be ensured to the maximum extent; the invention relates to a method for preparing a fiber bundle, which comprises the steps of preparing a first-stage double-screw extruder, preparing a second-stage double-screw extruder, and adding a fiber bundle into the first-stage double-screw extruder or the second-stage double-screw extruder, wherein the first-stage double-screw extruder is a building block type screw, the second-stage double-screw extruder is a hollow building block type screw section with different screw pitches according to different materials, the second-stage double-screw extruder is divided into a mixing area (tearing area), a strong mixing area and the like, and the fiber bundle is added into different areas, so that the obtained effect is completely different.
Preferably, the number of the sequential dispersion frames is 2, which correspond to two screws in the secondary twin-screw extruder, i.e. each screw in the secondary twin-screw extruder is used for conveying the fibers by one sequential dispersion frame, so that timely feeding can be ensured.
Preferably, the shape of the fiber air conveying channel is a W shape, when the screw horizontally passes through the lower part of the fiber air conveying channel of the W shape, the fiber air conveying channel can convey fibers to two radial sides of the screw, so that the fibers and the raw materials are mixed more uniformly, and the condition that the fibers are not uniformly distributed and the uniformity of the quality of the final polypropylene material is influenced when the fibers are conveyed to one side at the same time is avoided.
A raw material conveying device is arranged in the feed hopper, and preferably, the raw material conveying device is a reamer.
The extrusion injection molding system is characterized by a short runner and a large sprue. The structure shortens the flow of the fiber reinforced PP to reach the die cavity, and the large sprue can avoid the orientation and damage of the fiber as much as possible under the same condition, so the structure can more effectively ensure the fiber length of the product and the stability of the process.
The mold locking system mainly has the functions of locking the front mold and the rear mold and locking the mold cavity, so that the product is formed during high-pressure injection molding.
Secondly, the invention discloses a production process for on-line reinforcing polypropylene material by using long fiber, which comprises the following steps:
(1) adding the raw materials into a feed hopper arranged on a primary screw extruder, conveying the raw materials into the primary screw extruder for plasticizing, extruding the plasticized molten polypropylene from an extrusion die of the primary screw extruder, and feeding the molten polypropylene into a first feeding hole of a secondary double-screw extruder;
(2) continuously and orderly inputting the fibers into a second feeding hole of the secondary double-screw extruder through the sequential dispersion frame, and further mixing the fibers with a molten polypropylene material from the primary double-screw extruder for further plasticization;
(3) and injecting the molten mixture plasticized by the secondary double-screw extruder into a mold cavity of the secondary double-screw extruder by using an extrusion injection type injection molding system for injection molding, thus obtaining the product.
In the step (1), the raw materials comprise polypropylene and an auxiliary agent; the mass ratio of the polypropylene to the auxiliary agent is 6-7: 1.
Preferably, the auxiliary agent comprises grafted PP, elastomer POE, an antioxidant, a flame retardant and color master batch, and the content of each component in the auxiliary agent can be prepared according to specific requirements; preferably, the ratio of grafted PP: elastomer POE: antioxidant: flame retardant: the mass ratio of the color master batch is 4:2:1:1: 2.
In the step (1), the plasticizing temperature and time are adjusted according to needs, preferably the temperature is 210 +/-30 ℃, and the time is 20-40 s.
In the step (2), the plasticizing temperature and time are adjusted according to needs, preferably the temperature is 210 +/-30 ℃, and the time is 20-40 s.
In the step (2), the fibers include glass fibers, carbon fibers, basalt fibers and the like.
In the step (2), the mass ratio of the fibers to the raw materials in the step (1) is (2-3): (7-8).
In the step (2), the process parameters of the injection molding can be selected according to different injection molding equipment, and the invention is not particularly limited.
Finally, the invention discloses the application of the polypropylene material prepared by the production process of the long-fiber online reinforced polypropylene material in the fields of automobiles, electronics, household appliances, communication, medical devices and the like.
Compared with the prior art, the invention has the following beneficial effects:
when the polypropylene material is produced, continuous fibers are not cut, but are kneaded and plasticized by the screw, and are directly fed into the secondary double-screw extruder, and the fibers can be completely combined with the raw materials as much as possible by accurately designing the fiber inlet, so that the length of the fibers in the obtained polypropylene material is greatly increased, and the problem of short fiber length in the reinforced polypropylene material is effectively solved. Tests prove that the length of the fibers in the obtained polypropylene material reaches 30mm, which is obviously higher than the length of the fibers which are not sheared, and the sequential dispersion frame is arranged at the adding position of the fibers, so that the fibers can be ensured to uniformly and continuously enter, and further, the fibers are uniformly distributed in the raw materials, and the uniformity and the stability of the quality of the obtained polypropylene material are ensured. And a processing flow is reduced, and half of production energy consumption is reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic structural diagram of an apparatus for producing an on-line reinforced polypropylene material using long fibers according to the present invention.
FIG. 2 is a schematic top view of the sequential dispensing shelf of the present invention.
Description of reference numerals: 1-first-stage screw extruder, 2-second-stage double screw extruder, 3-extrusion injection molding system, 4-mold locking system, 5-feed hopper, 6-extrusion neck mold of first-stage screw extruder, 7-second feed inlet, 8-extrusion neck mold of second-stage double screw extruder, 9-sequential dispersing frame, 10-second-stage double screw extruder screw, 9.1-first dispersing frame shell, 9.2-first fiber air conveying channel, 9.3-first fiber conveying port, 9.4-second dispersing frame shell, 9.5-second fiber air conveying channel and 9.6-second fiber conveying port.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As described in the background art, the situation that the length of the long fiber is short and short after the long fiber is cut off, the fiber and the polypropylene molten polymer are kneaded unevenly, the reinforcing performance of the material is not obvious, the mechanical property of the polypropylene material cannot be effectively improved, and the application range of the product is limited, so the invention provides a production device and a production process for on-line reinforcing the polypropylene material by using the long fiber, and the invention is further explained by combining the attached drawings and the specific implementation mode.
Example 1
As shown in fig. 1 and fig. 2, the present embodiment provides an apparatus for producing an on-line reinforced polypropylene material by using long fibers, comprising: the device comprises a primary screw extruder 1, a secondary screw extruder 2, an extrusion injection type injection molding system 3, a mold locking system 4, a sequential dispersion frame 9, a secondary screw extruder screw 10, a first dispersion frame shell 9.1, a first fiber air conveying channel 9.2, a first fiber conveying port 9.3, a second dispersion frame shell 9.4, a second fiber air conveying channel 9.5 and a second fiber conveying port 9.6.
The one-level screw extruder 1 is provided with a feed hopper 5, a first feed inlet of the second-level screw extruder 2 is connected with an extrusion port die 6 of the one-level screw extruder 1, the extrusion injection type injection molding system 3 is connected with an extrusion port 8 of the second-level screw extruder 2, and the mold locking system 4 is connected with the extrusion injection type injection molding system 3.
The two groups of sequential dispersion frames 9 comprise first dispersion frame shells 9.1 and first fiber air conveying channels 9.2 which are horizontally arranged in the first dispersion frame shells 9.1, and first fiber conveying openings 9.3 are arranged in the first fiber air conveying channels 9.2; a second dispersion frame housing 9.4, and a second fiber air conveying channel 9.5 arranged horizontally inside the second dispersion frame housing 9.4, a first fiber conveying opening 9.6 being arranged in the first fiber air conveying channel 9.5.
The sequential dispersing frame 9 is arranged at the second feeding hole 7 of the secondary double-screw extruder 2, fibers enter the secondary double-screw extruder 2 from the second feeding hole 7 after passing through the sequential dispersing frame 9, the two groups of sequential dispersing frames respectively correspond to two secondary double-screw extruder screws 10 in the secondary double-screw extruder 2, namely, each screw in the secondary double-screw extruder 2 is independently conveyed by one sequential dispersing frame 9, and therefore timely feeding can be guaranteed.
A reamer for conveying raw materials is arranged in the feed hopper 5 of the primary screw extruder 1.
The second feed inlet 7 is arranged in a tearing area of the second-stage screw, so that fibers brought in by the screw are not torn and are only mixed.
The double screws of the two-stage double-screw extruder 2 are building block type screws, and hollow building block type screw sections with different screw pitches are matched according to different materials, so that the materials are uniformly dispersed to a large extent.
The extrusion injection type injection molding system 3 is characterized by a short runner and a large sprue, the structure shortens the flow of fiber reinforced PP to a mold cavity, and the large sprue can avoid the orientation and damage of fibers under the same condition as much as possible, so that the structure can more effectively ensure the fiber length of a product and the stability of the process.
Example 2
The embodiment provides a production process for on-line reinforcing a polypropylene material by using long fibers, which is carried out by the production device in the embodiment 1 and comprises the following steps:
(1) polypropylene and an auxiliary agent are mixed according to a mass ratio of 6:1, adding the mixture into a feed hopper arranged on a primary screw extruder, cutting the mixture by a reamer at an outlet below the feed hopper, inputting the cut mixture into the primary screw extruder, plasticizing the mixture at 200 ℃ for 30 seconds, extruding the plasticized molten polypropylene from an extrusion die of the primary screw extruder, and feeding the extruded molten polypropylene into a first feed port of a secondary double screw extruder;
(2) continuously and orderly inputting Glass Fibers (GF) into a second feeding hole of the secondary double-screw extruder through a sequential dispersion frame, and further mixing the GF with a molten polypropylene material from the primary double-screw extruder for further plasticization at the temperature of 220 ℃ for 30 s;
(3) and injecting the molten mixture plasticized by the secondary double-screw extruder into a mold cavity of the secondary double-screw extruder by using an extrusion injection type injection molding system for injection molding, thus obtaining the product.
In the step (1), the auxiliary agent comprises grafted PP, elastomer POE, antioxidant, flame retardant and color master batch, the grafted PP, the elastomer POE, the antioxidant, the flame retardant and the color master batch are uniformly mixed and then are added into a feed hopper at the same time, and the mass ratio of the grafted PP to the elastomer POE to the antioxidant to the flame retardant to the color master batch is 4:2:1:1: 2.
In the step (2), the mass ratio of the Glass Fiber (GF) to the raw material is 3: 7.
In the step (3), the parameters of the injection molding are shown in table 1.
Example 3
The embodiment provides a production process for on-line reinforcing a polypropylene material by using long fibers, which is carried out by the production device in the embodiment 1 and comprises the following steps:
(1) polypropylene and an auxiliary agent are mixed according to a mass ratio of 6:1, adding the mixture into a feed hopper arranged on a primary screw extruder, cutting the mixture by a reamer at an outlet below the feed hopper, inputting the cut mixture into the primary screw extruder, plasticizing the mixture at 180 ℃ for 40 seconds, extruding the plasticized molten polypropylene from an extrusion die of the primary screw extruder, and feeding the extruded molten polypropylene into a first feed port of a secondary double-screw extruder;
(2) continuously and orderly inputting basalt fibers into a second feeding hole of the secondary double-screw extruder through the sequential dispersion frame, and further mixing the basalt fibers with a molten polypropylene material from the primary double-screw extruder for further plasticization at the temperature of 240 ℃ for 20 s;
(3) and injecting the molten mixture plasticized by the secondary double-screw extruder into a mold cavity of the secondary double-screw extruder by using an extrusion injection type injection molding system for injection molding, thus obtaining the product.
In the step (1), the auxiliary agent comprises grafted PP, elastomer POE, antioxidant, flame retardant and color master batch, the grafted PP, the elastomer POE, the antioxidant, the flame retardant and the color master batch are uniformly mixed and then are added into a feed hopper at the same time, and the mass ratio of the grafted PP to the elastomer POE to the antioxidant to the flame retardant to the color master batch is 4:2:1:1: 2.
In the step (2), the ratio of the basalt fibers to the raw materials is 3: 7.
In the step (3), the parameters of the injection molding are shown in table 1.
Example 4
The embodiment provides a production process for on-line reinforcing a polypropylene material by using long fibers, which is carried out by the production device in the embodiment 1 and comprises the following steps:
(1) polypropylene and an auxiliary agent are mixed according to a mass ratio of 7:1, adding the mixture into a feed hopper arranged on a primary screw extruder, cutting the mixture by a reamer at an outlet below the feed hopper, inputting the cut mixture into the primary screw extruder, plasticizing the mixture at 240 ℃ for 20 seconds, extruding the plasticized molten polypropylene from an extrusion die of the primary screw extruder, and feeding the extruded molten polypropylene into a first feed port of a secondary double screw extruder;
(2) continuously and orderly inputting the carbon fibers into a second feeding hole of the secondary double-screw extruder through the sequential dispersion frame, and further mixing the carbon fibers with a molten polypropylene material from the primary double-screw extruder for further plasticization at the temperature of 180 ℃ for 40 s;
(3) and injecting the molten mixture plasticized by the secondary double-screw extruder into a mold cavity of the secondary double-screw extruder by using an extrusion injection type injection molding system for injection molding, thus obtaining the product.
In the step (1), the auxiliary agent comprises: the grafted PP, the elastomer POE, the antioxidant, the flame retardant and the color master batch are uniformly mixed and then are added into a feed hopper, and the mass ratio of the grafted PP, the elastomer POE, the antioxidant, the flame retardant and the color master batch is 4:2:1:1: 2.
In the step (2), the ratio of the carbon fibers to the raw materials is 2: 8.
In the step (3), the parameters of the injection molding are shown in table 1.
Comparative example 1
A production process for on-line reinforcing polypropylene material by using long fiber comprises the following steps:
(1) weighing polypropylene, an auxiliary agent and Glass Fiber (GF) according to a certain proportion, adding the weighed materials into a feed hopper arranged on a primary screw extruder, cutting the materials by a reamer at an outlet below the feed hopper, inputting the cut materials into the primary screw extruder, plasticizing the materials at 200 ℃ for 30s, extruding the plasticized molten polypropylene from an extrusion die of the primary screw extruder, and further plasticizing the extruded molten polypropylene in a secondary double-screw extruder; the plasticizing temperature is 220 ℃ and the plasticizing time is 30 s;
(2) and injecting the molten mixture plasticized by the secondary double-screw extruder into a mold cavity of the secondary double-screw extruder by using an extrusion injection type injection molding system for injection molding, thus obtaining the product.
In the step (1), the mass ratio of the polypropylene to the auxiliary agent is as follows: 6:1, wherein the ratio of the addition amount of the Glass Fiber (GF) to the total mass of the polypropylene and the auxiliary agent is 3:7, the length of the stripping fiber is 30-40 mm.
In the step (1), the auxiliary agent comprises: the grafted PP, the elastomer POE, the antioxidant, the flame retardant and the color master batch are uniformly mixed and then are added into a feed hopper, and the mass ratio of the grafted PP, the elastomer POE, the antioxidant, the flame retardant and the color master batch is 4:2:1:1: 2.
In the step (3), the parameters of the injection molding are shown in table 1.
TABLE 1 injection Molding parameters
And (3) performance testing:
the performance of the polypropylene materials prepared in example 2 and comparative example 1 was tested, and the results are shown in tables 2 and 3, respectively, and 3 sets of tests were performed using the same raw materials, ratios thereof, and process parameters in each method in order to ensure the stability of the tests.
TABLE 2
TABLE 3
As can be seen from tables 2 and 3, when the polypropylene material is produced, continuous uncut long fibers are orderly fed into the second feed port of the secondary twin-screw extruder, so that the problem of short fiber length in the reinforced polypropylene material is effectively solved, and the obtained polypropylene material has obvious performance indexes.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides an utilize continuous long fiber online reinforcing polypropylene material apparatus for producing which characterized in that: the method comprises the following steps: the injection molding device comprises a primary screw extruder, a secondary screw extruder, an extrusion injection molding system, a mold locking system and a sequential dispersion frame, wherein the primary screw extruder is provided with a feed hopper, a first feed port of the secondary screw extruder is connected with an extrusion opening mold of the primary screw extruder, the extrusion injection molding system is connected with the extrusion opening mold of the secondary screw extruder, the mold locking system is connected with the extrusion injection molding system, the sequential dispersion frame comprises a dispersion frame shell and a fiber air conveying channel horizontally arranged in the dispersion frame shell, the fiber air conveying channel is W-shaped, a plurality of fiber conveying ports are arranged in the fiber air conveying channel, the fiber conveying ports are used for conveying continuous uncut long fibers, and the fiber length in a polypropylene material reaches more than 30 mm; the sequential dispersion frame is arranged at a second feed port of the secondary double-screw extruder, the continuous long fibers pass through the sequential dispersion frame and then enter the secondary double-screw extruder from the second feed port, and the second feed port is arranged in a tearing area of a second-stage screw.
2. The apparatus for producing on-line reinforced polypropylene material using continuous long fiber according to claim 1, wherein: the number of the sequential dispersion frames is 2 groups, and the sequential dispersion frames correspond to two screws in the secondary double-screw extruder respectively.
3. The apparatus for producing on-line reinforced polypropylene material using continuous long fiber according to claim 1, wherein: the bottom of the secondary double-screw extruder is subjected to reducing treatment, and preferably, the bottom of the secondary double-screw extruder is conical;
or the extrusion injection type injection molding system is a short runner and a large sprue;
or, a raw material conveying device is arranged at an outlet below the feed hopper, and preferably, the raw material conveying device is a reamer.
4. The apparatus for producing on-line reinforced polypropylene material using continuous long fiber according to claim 3, wherein: the screw rod in the second-stage double-screw extruder is a building block type screw rod, the building block type screw rod is matched with hollow building block type screw rod sections with different screw pitches according to different materials, and each hollow building block type screw rod section comprises a tearing area and a strong mixing area.
5. A process for the in-line reinforcement of polypropylene materials using the production apparatus as claimed in any one of claims 1 to 4, characterized in that: the method comprises the following steps:
adding raw materials into a feed hopper arranged on a primary screw extruder, inputting the raw materials into the primary screw extruder through the feed hopper for plasticizing, extruding the plasticized molten polypropylene from an extrusion die of the primary screw extruder, and feeding the molten polypropylene into a first feeding hole of a secondary double-screw extruder;
continuously and orderly inputting long fibers into a second feeding hole of the secondary double-screw extruder through the sequential dispersion frame, and further mixing the long fibers with a molten polypropylene material from the primary double-screw extruder for further plasticization;
and (3) injecting the molten mixture plasticized by the secondary double-screw extruder into a die cavity of the secondary double-screw extruder by using an extrusion injection type injection molding system for injection molding, and thus obtaining the material.
6. The process for producing an in-line reinforced polypropylene material according to claim 5, wherein: in the step (1), the raw materials comprise polypropylene and an auxiliary agent, and the mass ratio of the polypropylene to the auxiliary agent is as follows: 6-7: 1;
preferably, the auxiliary agent comprises grafted PP, elastomer POE, antioxidant, flame retardant and color master batch;
further preferably, the mass ratio of the grafted PP, the elastomer POE, the antioxidant, the flame retardant and the color master batch is 4:2:1:1: 2.
7. The process for producing an in-line reinforced polypropylene material according to claim 5, wherein: in the step (1), the plasticizing temperature is 210 +/-30 ℃, and the plasticizing time is 20-40 s.
8. Process for the production of an in-line reinforced polypropylene material according to any one of claims 5 to 7, wherein: in the step (2), the plasticizing temperature is 210 +/-30 ℃, and the plasticizing time is 20-40 s.
9. Process for the production of an in-line reinforced polypropylene material according to any one of claims 5 to 7, wherein: in the step (2), the fibers comprise one or more of glass fibers, carbon fibers and basalt fibers;
preferably, the mass ratio of the fibers to the raw materials in the step (1) is (2-3): (7-8).
10. Use of a polypropylene material prepared by the process according to any one of claims 5 to 9, wherein: the polypropylene material is applied to the fields of automobiles, electronics, household appliances, communication and medical equipment.
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| CN111089212B (en) * | 2019-12-31 | 2021-01-05 | 浙江大学 | Short fiber reinforced plastic electric melting pipe fitting with optimized injection position and injection mold thereof |
| CN111761844A (en) * | 2020-06-30 | 2020-10-13 | 诺思贝瑞新材料科技（苏州）有限公司 | Continuous fiber composite material for 3D printing and preparation method and device thereof |
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