Raw material processing device and method for preparing modified polypropylene composition

Abstract

The invention discloses a raw material processing device for manufacturing a modified polypropylene composition and a method thereof, and belongs to the technical field of automotive interior materials, the raw material processing device comprises a mixing tank, the bottom of the mixing tank is fixedly connected with a rack, and a main rotating rod is rotatably mounted in the mixing tank; the main rotating rod is sequentially provided with a dispersing and mixing part, a lifting and rotating part and a shifting anti-settling part from top to bottom; the dispersing and mixing part comprises a dispersing disc and is used for cutting and dispersing an auxiliary floating on the surface and driving materials at the bottom to turn over so as to avoid sedimentation; the lifting rotating part comprises a lifting vertical plate and an auxiliary rotating rod and is used for fully stirring and mixing materials, one end of the transverse rotating rod drives the auxiliary rotating rod to rotate through a second fluted disc and a first fluted disc, the auxiliary rotating rod can drive the lifting vertical plate to move up and down, and the lifting vertical plate can revolve around the main rotating rod; the device has the technical effects of being excellent in mixing effect, high in efficiency, stable in device operation and stable in product performance.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of automotive interior materials, and particularly relates to a raw material processing device for manufacturing a modified polypropylene composition and a method thereof. BACKGROUND

[0002] Polypropylene composite materials are widely used in automotive interiors, but the surface of the materials is prone to scratches, which affects the appearance and service life of the automotive interiors. To solve this problem, the polypropylene composite materials need to be modified to develop a modified polypropylene composition with excellent scratch resistance. In the prior art, although there are various modification methods, the scratch resistance is improved at the expense of other properties of the material, such as melt flow rate and impact strength. In the raw material mixing process, problems such as uneven mixing, poor dispersing effect of additives, and sedimentation of bottom materials often occur, which affect the performance of the final product. Therefore, it is of great significance to develop a manufacturing device and method for a modified polypropylene composition that can significantly improve the scratch resistance of the material while ensuring other properties of the material and achieve efficient and uniform mixing of raw materials. SUMMARY

[0003] In view of the problems in the prior art, the application provides a raw material processing device for manufacturing a modified polypropylene composition and a method thereof, which has the advantages of excellent mixing effect, high efficiency, stable device operation, and stable product performance, and solves the problems of uneven dispersing of additives, sedimentation of materials, insufficient mixing, and affected product performance in the manufacturing of a modified polypropylene composition in the prior art.

[0004] The application is implemented as follows: a raw material processing device for manufacturing a modified polypropylene composition includes a mixing tank, a rack is fixedly connected to the bottom of the mixing tank, a main rotating shaft is rotatably installed in the interior of the mixing tank, a dispersing and mixing member, a lifting and rotating member, and a material stirring and sedimentation prevention member are sequentially arranged on the main rotating shaft from top to bottom; the dispersing and mixing member includes a dispersing disc for cutting and dispersing the additives floating on the surface, and the dispersing disc is fixedly sleeved on the main rotating shaft; the material stirring and sedimentation prevention member includes a horizontal rotating shaft and a material stirring plate, the material stirring plate can rotate on its own axis and revolve around the main rotating shaft, and is used for stirring the bottom materials to prevent sedimentation; the lifting and rotating member includes a lifting vertical plate and an auxiliary rotating shaft, and is used for fully stirring the mixed materials; one end of the horizontal rotating shaft drives the auxiliary rotating shaft to rotate through a second gear plate and a first gear plate, the auxiliary rotating shaft can drive the lifting vertical plate to move up and down, and the lifting vertical plate can revolve around the main rotating shaft.

[0005] Preferably, a motor is fixedly installed at the top of the mixing tank, a main rotating shaft is vertically installed in the interior of the mixing tank through a bearing, and the upper end of the main rotating shaft is fixedly connected to the output end of the motor.

[0006] Through the arrangement, the rotation of the main rotating rod is facilitated, and the synchronous linkage of the dispersion mixing element, the lifting rotating element and the stirring anti-settling element is realized, thereby providing power guarantee for multi-dimensional mixing.

[0007] As preferred, the dispersion disc is provided with uniformly distributed material ports, the inner side of the material port is provided in a sawtooth structure, and the upper and lower ends of the material port are respectively fixedly connected with uniformly distributed upper and lower tooth knives.

[0008] Through the arrangement, the sawtooth material port and the double-layer tooth knife form a three-dimensional cutting structure, when the additives float on the surface, the additive agglomerates can be broken into microparticles through multi-directional shearing force, the material port design promotes the up-and-down convection of the materials, avoids the additive floating and dispersion caused by traditional single-layer stirring, and improves the dispersion mixing effect.

[0009] As preferred, the bottom of the main rotating rod is fixedly connected with support plates on both sides, one end of the horizontal rotating rod is connected to the inner side of the bottom of the support plate through a bearing, the other end of the horizontal rotating rod is connected to the side wall of the main rotating rod through a bearing, and the stirring plate is fixedly connected to the side wall of the horizontal rotating rod.

[0010] Through the arrangement, the support plate and the main rotating rod form a stable support structure, the bearing connection ensures the flexible rotation of the horizontal rotating rod, the stirring plate can move close to the bottom of the mixing tank, the deposited heavy materials such as talc can be precisely stirred, the imbalance of the mixing ratio caused by the accumulation of the materials at the bottom is avoided, and the overall flowability of the materials is improved.

[0011] As preferred, one end of the horizontal rotating rod penetrates to the outside of the support plate and is sleeved and fixed with a second tooth disc, the inner wall of the bottom of the mixing tank is fixedly connected with a gear ring, and the bottom of the second tooth disc is meshingly connected with the gear ring.

[0012] Through the arrangement, the meshing transmission of the gear ring and the second tooth disc converts the revolution motion of the main rotating rod into the rotation power of the horizontal rotating rod, the stirring plate realizes rotation while revolving around the main rotating rod, the overturning effect on the materials at the bottom is significantly enhanced, and the local deposition problem caused by the traditional fixed-direction stirring is solved.

[0013] As preferred, the first tooth disc is sleeved and fixed on the auxiliary rotating rod, the top of the second tooth disc is meshingly connected with the first tooth disc, a half-tooth ring is sleeved and fixed on the auxiliary rotating rod, the back of the bottom of the lifting vertical plate is fixedly connected with a gear rack, and the toothed part of the half-tooth ring is meshingly connected with the gear rack.

[0014] Through the arrangement, the power of the stirring anti-settling element is transmitted to the lifting rotating element through the linkage of the second tooth disc and the first tooth disc, the intermittent meshing of the half-tooth ring and the gear rack realizes the reciprocating lifting of the lifting vertical plate, the stirring range covers different height regions of the mixing tank, and the cross mixing of the upper and lower materials is promoted.

[0015] As the preferred of the present application, the lifting vertical plate top sliding penetrates the dispersion disc, the dispersion disc is provided with guide holes matched with the lifting vertical plate, the top of the lifting vertical plate is fixedly connected with a baffle, the baffle and the bottom of the dispersion disc are fixedly connected through a spring, and the side wall of the lifting vertical plate is fixedly connected with a stirring support rod.

[0016] Through the arrangement, the guide hole ensures the stable movement track of the lifting vertical plate, the spring cooperates with the half-tooth ring to realize the flexible buffering of the lifting action, the automatic resetting movement of the lifting vertical plate is facilitated, the stirring support rod moves synchronously with the lifting vertical plate, a multi-dimensional stirring network is formed, the internal agglomeration structure of the material can be broken, and the mixing uniformity is further improved.

[0017] A raw material processing method for manufacturing a modified polypropylene composition, and a raw material processing device for manufacturing the modified polypropylene composition, comprising the following steps: S1, synthesis of a polysiloxane additive: Under the protection of nitrogen, 60% of the total amount of alkenyl butyl glycidyl ether is added to the reaction kettle, the hydrogen-containing polysiloxane is dropped through a dropping device within 2h, 3-5ppm of platinum catalyst is added, and the reaction is carried out at a constant temperature of 80-85℃. During the reaction process, the stirrer is used for stirring. After the free epoxy value is greater than or equal to 95%, the product is sent to a thin film evaporator, and low boiling point substances are removed under the conditions of 120℃ and 5kPa, so as to obtain a polysiloxane additive with a volatile content of less than or equal to 0.8%; S2, raw material mixing processing: According to the ratio of PP / talc (70 / 30), the polypropylene and talc are added to the mixing tank, and the polysiloxane additive prepared in step S1 is added, and the addition amount is 1.5-2.5wt%. The dispersing and mixing element is used for cutting and dispersing the additive floating on the surface, the lifting and rotating element is used for fully stirring the mixed material, and the stirring preventing sinking element is used for driving the bottom material to overturn, so as to avoid sedimentation, so that the composition is fully mixed and uniform, and the mixing efficiency is improved. S3, extrusion molding: The mixed material is sent to a double screw extruder, the extrusion temperature is set to 190-210℃, and the screw rotation speed is 300r / min. After extrusion, the material is cooled by a cooling device, and then granulated by a granulator to obtain a modified polypropylene composition.

[0018] Compared with the prior art, the beneficial effects of the present application are as follows: the dispersing and mixing element, the lifting and rotating element and the stirring preventing sinking element in the mixing tank cooperate to process the material in multiple dimensions, solve the problems of uneven dispersion of the additive, material sedimentation and insufficient mixing in traditional mixing, greatly improve the mixing uniformity, and avoid local performance difference. The linkage design of each component accelerates the mixing speed, shortens the time, and improves the production efficiency.

[0019] The prepared modified polypropylene composition is excellent in scratch resistance, melt flow rate and low-temperature impact strength retention, meets the use requirement of automotive interior material and has wide application prospect: Scratch resistance: according to the standard of Volkswagen TL226, the scratch width is reduced by 62% under a load of 5N, effectively solving the problem that the surface of the polypropylene composite material of the automotive interior is easy to scratch; Melt flow rate: increased from 18 g / 10 min to 24 g / 10 min (230 DEG C / 2.16 kg), improving the processing fluidity of the material and facilitating subsequent processing processes such as injection molding; Impact strength retention: reaching 85% of the initial value at-30 DEG C, ensuring the use performance of the material in a low-temperature environment. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic diagram of a three-dimensional structure provided by an embodiment of the present application; Figure 2 is a schematic diagram of a cross-sectional structure provided by an embodiment of the present application; Figure 3 is a schematic diagram of an internal structure provided by an embodiment of the present application; Figure 4 is a schematic diagram of a middle back structure provided by an embodiment of the present application; Figure 3 Figure 5 is a schematic diagram of a dispersion disc structure provided by an embodiment of the present application; Figure 6 is a schematic diagram of an enlarged structure at a tooth ring provided by an embodiment of the present application; Figure 2

[0021] In the figure: 1, mixing tank; 101, rack; 102, gear ring; 2, main rotating rod; 201, motor; 3, dispersion disc; 301, material port; 302, upper tooth cutter; 303, lower tooth cutter; 304, guide hole; 4, lifting vertical plate; 401, stirring support rod; 402, baffle; 403, spring; 404, rack; 5, auxiliary rotating rod; 501, first tooth disc; 502, half-tooth ring; 6, horizontal rotating rod; 601, material pushing plate; 602, second tooth disc; 603, support plate. DETAILED DESCRIPTION

[0022] In order to further understand the inventive content, characteristics and effects of the present application, the following examples are given, and are described in detail as follows with reference to the accompanying drawings.

[0023] The structure of the present application is described in detail below with reference to the accompanying drawings.

[0024] Reference Figures 1 to 6 ​​As shown, the raw material processing device for manufacturing modified polypropylene composition provided by the embodiment of the application comprises a mixing tank 1, the bottom of the mixing tank 1 is fixedly connected with a rack 101, a main rotating shaft 2 is rotatably installed in the inside of the mixing tank 1, and a dispersion mixing part, a lifting rotating part and a stirring anti-settling part are sequentially arranged on the main rotating shaft 2 from top to bottom.

[0025] Specifically, a motor 201 is fixedly installed at the top of the mixing tank 1, and the main rotating shaft 2 is vertically installed in the inside of the mixing tank 1 through a bearing, and the upper end of the main rotating shaft 2 is fixedly connected with the output end of the motor 201.

[0026] By adopting the above scheme, the main rotating shaft 2 can be driven to rotate, and the dispersion mixing part, the lifting rotating part and the stirring anti-settling part can be synchronously linked, thereby providing power guarantee for multi-dimensional mixing.

[0027] Specifically, the dispersion disc 3 is provided with uniformly distributed material openings 301, the inner side of the material opening 301 is provided in a sawtooth structure, and the upper end and the lower end of the material opening 301 are respectively fixedly connected with uniformly distributed upper tooth knives 302 and lower tooth knives 303.

[0028] By adopting the above scheme, the sawtooth material opening 301 and the double-layer tooth knives form a three-dimensional cutting structure, when the additives float on the surface, the additive agglomerates can be broken into microparticles through multi-directional shearing force, the material opening 301 is designed to promote the upward and downward convection of the material, which is beneficial to avoid the floating dispersion of the additives caused by traditional single-layer stirring, and improve the dispersion mixing effect.

[0029] Specifically, the bottom of the main rotating shaft 2 is fixedly connected with support plates 603 on both sides, one end of the horizontal rotating shaft 6 is connected to the bottom inner side of the support plate 603 through a bearing, the other end of the horizontal rotating shaft 6 is connected to the side wall of the main rotating shaft 2 through a bearing, and the stirring plate 601 is fixedly connected to the side wall of the horizontal rotating shaft 6.

[0030] By adopting the above scheme, the support plate and the main rotating shaft 2 form a stable support structure, the bearing connection ensures the flexible rotation of the horizontal rotating shaft 6, the stirring plate 601 can move close to the bottom of the mixing tank 1, the deposited heavy raw materials such as talc powder can be accurately stirred, the imbalance of the mixing proportion caused by the accumulation of the bottom material can be avoided, and the overall flowability of the material is improved.

[0031] Specifically, one end of the horizontal rotating rod 6 penetrates to the outside of the supporting plate 603 and is sleeved and fixed with the second gear plate 602, the inner wall of the bottom of the mixing tank 1 is fixedly connected with the gear ring 102, and the bottom of the second gear plate 602 and the gear ring 102 are in meshing connection.

[0032] By adopting the above scheme, the meshing transmission of the gear ring 102 and the second gear plate 602 converts the revolution motion of the main rotating rod 2 into the rotation power of the horizontal rotating rod 6, so that the stirring plate 601 realizes rotation while revolving around the main rotating rod 2, the stirring effect on the bottom material is significantly enhanced, and the local deposition problem caused by the traditional fixed-direction stirring is solved.

[0033] Specifically, the first gear plate 501 is sleeved and fixed on the auxiliary rotating rod 5, the top of the second gear plate 602 and the first gear plate 501 are in meshing connection, the auxiliary rotating rod 5 is sleeved and fixed with the half gear ring 502, the bottom back of the lifting vertical plate 4 is fixedly connected with the rack 404, and the toothed part of the half gear ring 502 and the rack 404 are in meshing connection.

[0034] By adopting the above scheme, the power of the material stirring anti-deposition part is transmitted to the lifting rotating part through the linkage of the second gear plate 602 and the first gear plate 501, the intermittent meshing of the half gear ring 502 and the rack 404 realizes the reciprocating lifting of the lifting vertical plate 4, the stirring range covers different height regions of the mixing tank 1, and the upper and lower materials are promoted to cross and mix.

[0035] Specifically, the lifting vertical plate 4 is slidably penetrated through the dispersing disc 3, the dispersing disc 3 is provided with a guide hole 304 matched with the lifting vertical plate 4, the top of the lifting vertical plate 4 is fixedly connected with a baffle 402, the baffle 402 and the bottom of the dispersing disc 3 are fixedly connected through a spring 403, and the side wall of the lifting vertical plate 4 is fixedly connected with a stirring support rod 401.

[0036] By adopting the above scheme, the guide hole 304 ensures the stable motion track of the lifting vertical plate 4, the spring 403 cooperates with the half gear ring 502 to realize flexible buffering of the lifting action, automatic reset movement operation of the lifting vertical plate 4 is facilitated, the stirring support rod 401 moves synchronously with the lifting vertical plate 4, a multi-directional stirring network is formed, the material inside can be broken into a cluster structure, and the mixing uniformity is further improved.

[0037] A raw material processing method for manufacturing a modified polypropylene composition, which is suitable for a raw material processing device for manufacturing the modified polypropylene composition, includes the following steps: S1, synthesis of a polysiloxane additive: Under the protection of nitrogen, 60% of the total amount of alkenyl butyl glycidyl ether is added to the reaction kettle, and the hydrogen-containing polysiloxane is dropped through the dropping device within 2h, while 3-5ppm of platinum catalyst is added, and the reaction is carried out at a constant temperature of 80-85 DEG C, and the stirring is carried out by the stirrer during the reaction, and after the free epoxy value is greater than or equal to 95%, the product is sent to a thin film evaporator, and low boiling point substances are removed under the condition of 120 DEG C and 5kPa, and the polysiloxane additive with a volatile content of less than or equal to 0.8% is obtained; S2, raw material mixing process: According to the ratio of PP / talc (70 / 30), the polypropylene and talc are added to the mixing tank 1, and the polysiloxane additive prepared in step S1 is added, and the addition amount is 1.5-2.5wt%, the additive floating on the surface is cut and dispersed by the dispersion mixing piece, the mixture is fully stirred by the lifting rotating piece, the bottom material is turned over by the stirring preventing sinking piece to avoid sedimentation, and the combined material is fully mixed and uniformly distributed to improve the mixing efficiency; S3, extrusion molding: The mixed material is sent into a double screw extruder, the extrusion temperature is set to 190-210 DEG C, and the screw rotation speed is 300r / min, after extrusion, the material is cooled by a cooling device, and then the material is cut into particles by a pelletizer, and the modified polypropylene composition is obtained.

[0038] Working principle of the application: In use, the motor 201 drives the main rotating rod 2 to rotate, and drives the dispersion mixing piece, the lifting rotating piece and the stirring preventing sinking piece to operate synchronously, when the dispersion disc 3 of the dispersion mixing piece rotates, the serrated material port 301 and the upper and lower tooth cutter 303 form a three-dimensional cutting to break the additive agglomerates floating on the surface into microparticles, and the material port 301 promotes the upward and downward convection of the material, and improves the dispersion effect; in the stirring preventing sinking piece, the horizontal rotating rod 6 revolves with the main rotating rod 2 under the support of the support plate 603, the second tooth disc 602 is engaged with the bottom tooth ring 102 of the mixing tank 1 to rotate, drives the stirring plate 601 to revolve and rotate, effectively turns over the bottom material to avoid sedimentation and accumulation; at the same time, the second tooth disc 602 drives the first tooth disc 501 to rotate the auxiliary rotating rod 5, the half-tooth ring 502 is intermittently engaged with the rack 404 of the lifting vertical plate 4, and cooperates with the spring 403 to realize the reciprocating lifting of the lifting vertical plate 4, the stirring branch rod 401 on the side wall revolves with the main rotating rod 2 to form a multi-directional stirring network, breaks the agglomeration in the material, and promotes the cross mixing of the upper and lower layers of the material. Through the synergistic effect of various components, the polypropylene, talc and polysiloxane additive are mixed uniformly and efficiently in multiple dimensions, high-quality raw materials are provided for subsequent extrusion molding, and the production efficiency is effectively improved.

[0039] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is not intended to exclude myriad other embodiments of the present application that other inventors can develop based on the same general inventive concepts embodied by the described embodiments. That is, although the present application is described in terms of particular embodiments and illustrative figures, it should be apparent that the scope of the present application is not limited to these specific embodiments.

[0040] While the embodiments of the application have been shown and described herein, it is to be understood that the scope of the application, jointly pointed out in the appended claims, is not limited to the details of the embodiments shown, and that various changes can be made and equivalents employed without departing from the intended spirit and scope of the application.

Claims

1. A raw material processing device for manufacturing a modified polypropylene composition, comprising a mixing tank (1), characterized in that: The bottom of the mixing tank (1) is fixedly connected with a rack (101), and the inside of the mixing tank (1) is rotatably installed with a main rotating rod (2), and the main rotating rod (2) is sequentially provided, from top to bottom, with a dispersion mixing part, a lifting rotating part and a stirring anti-settling part. The dispersion mixing part comprises a dispersion disc (3) for cutting and dispersing the additives floating on the surface, and the dispersion disc (3) is fixedly sleeved on the main rotating rod (2). The stirring anti-settling part comprises a horizontal rotating rod (6) and a stirring plate (601), the stirring plate (601) can rotate around the main rotating rod (2) and rotate around its own axis, and is used for driving the material at the bottom to be stirred to avoid settling. The lifting rotating part comprises a lifting vertical plate (4) and an auxiliary rotating rod (5), and is used for fully stirring the mixed material, one end of the horizontal rotating rod (6) drives the auxiliary rotating rod (5) to rotate through the second gear disc (602) and the first gear disc (501), the auxiliary rotating rod (5) can drive the lifting vertical plate (4) to move up and down, and the lifting vertical plate (4) can revolve around the main rotating rod (2).

2. An apparatus for processing a raw material for manufacturing a modified polypropylene composition according to claim 1, characterized in that: The top of the mixing tank (1) is fixedly installed with a motor (201), and the inside of the mixing tank (1) is vertically installed with the main rotating rod (2) through a bearing, and the upper end of the main rotating rod (2) is fixedly connected with the output end of the motor (201).

3. An apparatus for processing a raw material for manufacturing a modified polypropylene composition according to claim 1, characterized in that: The dispersion disc (3) is provided with uniformly distributed material openings (301) on the upper and lower ends, the inner side of the material opening (301) is provided in a sawtooth structure, and the upper and lower ends of the material opening (301) are fixedly connected with uniformly distributed upper and lower toothed knives (302) and (303), respectively.

4. An apparatus for processing a raw material for manufacturing a modified polypropylene composition according to claim 1, characterized in that: The bottom of the main rotating rod (2) is fixedly connected with support plates (603) on both sides, one end of the horizontal rotating rod (6) is connected to the inner bottom side of the support plate (603) through a bearing, the other end of the horizontal rotating rod (6) is connected to the side wall of the main rotating rod (2) through a bearing, and the stirring plate (601) is fixedly connected to the side wall of the horizontal rotating rod (6).

5. An apparatus for processing a raw material for manufacturing a modified polypropylene composition according to claim 1, characterized in that: One end of the horizontal rotating rod (6) penetrates to the outside of the support plate (603) and is fixedly sleeved with the second gear disc (602), the bottom inner wall of the mixing tank (1) is fixedly connected with a gear ring (102), and the bottom of the second gear disc (602) is engagedly connected with the gear ring (102).

6. An apparatus for processing a raw material for manufacturing a modified polypropylene composition according to claim 1, characterized in that: The first gear disc (501) is fixedly sleeved on the auxiliary rotating rod (5), the top of the second gear disc (602) is engagedly connected with the first gear disc (501), the auxiliary rotating rod (5) is fixedly sleeved with a half-tooth ring (502), the bottom back of the lifting vertical plate (4) is fixedly connected with a gear rack (404), and the toothed part of the half-tooth ring (502) is engagedly connected with the gear rack (404).

7. An apparatus for processing a raw material for manufacturing a modified polypropylene composition according to claim 1, characterized in that: The top of the lifting vertical plate (4) is slidably penetrated through the dispersion disc (3), the dispersion disc (3) is provided with a guide hole (304) matched with the lifting vertical plate (4), the top of the lifting vertical plate (4) is fixedly connected with a baffle (402), the baffle (402) and the bottom of the dispersion disc (3) are fixedly connected through a spring (403), and the side wall of the lifting vertical plate (4) is fixedly connected with a stirring support rod (401).

8. A raw material processing method for manufacturing a modified polypropylene composition, characterized by, The raw material processing device for manufacturing the modified polypropylene composition according to any one of claims 1-7, comprising the following steps: S1, synthesis of a polysiloxane additive: Under the protection of nitrogen, 60% of the total amount of alkenyl butyl glycidyl ether is added to the reaction kettle, the hydrogen-containing polysiloxane is dropped through the dropping device within 2h, and 3-5ppm of platinum catalyst is added at the same time, and the reaction is carried out at a constant temperature of 80-85℃, and the stirring is carried out by the stirrer during the reaction, after the free epoxy value is greater than or equal to 95%, the product is sent to the thin film evaporator, and the low boiling point is removed under the condition of 120℃ and 5kPa, and the polysiloxane additive with a volatile content of less than or equal to 0.8% is obtained; S2, raw material mixing processing: The polypropylene and talcum powder are added to the mixing tank (1) according to the ratio of PP / talcum powder (70 / 30), and the polysiloxane additive prepared in step S1 is added, and the addition amount is 1.5-2.5wt%, the additive floating on the surface is cut and dispersed by the dispersion mixing element, the mixture is fully stirred by the lifting rotating element, the bottom material is turned over by the stirring preventing element to avoid sedimentation, so that the composition is fully mixed and uniform, and the mixing efficiency is improved; S3, extrusion molding: The mixed material is sent into the double screw extruder, the extrusion temperature is set to 190-210℃, and the screw rotation speed is 300r / min, after extrusion, the material is cooled by the cooling device, and then the material is cut into particles by the pelletizer, and the modified polypropylene composition is obtained.

Images