Polypropylene color master batch preparation method capable of reducing pigment interference and color master batch mixing device

Abstract

The invention discloses a polypropylene color master batch preparation method capable of reducing pigment interference and a color master batch mixing device, the device comprises an outer cylinder and an inner core body, the inner core body is coaxially and fixedly mounted in the outer cylinder, an annularly distributed feeding gap is formed between the inner circumference of the outer cylinder and the outer circumference of the inner core body, one end of the outer cylinder is a feeding end, and the other end of the outer cylinder is a discharging end; the inner peripheries of the first ring body pieces are fixedly connected with the inner core body, the outer peripheries of the first ring body pieces are fixedly connected with the outer barrel body, the two first ring body pieces are fixedly connected side by side, an annular cavity is formed between every two adjacent first ring body pieces, first through holes are formed in the first ring body pieces, and the first through holes communicate with the feeding gap and the annular cavities; and a rotating disc group is mounted in the annular cavity. According to the invention, the color master batch material and the polypropylene can be mixed in advance to prepare the polypropylene color master batch particles with high color master batch concentration; in the production process, the polypropylene color master batch particles are mixed with other polypropylene raw materials, so that the color master batch materials and the raw materials can be efficiently and uniformly fused.

Description

Technical Field

[0001] The invention relates to the technical field of polymer materials, and more specifically to a masterbatch mixing device and a method for preparing a polypropylene masterbatch capable of reducing pigment interference. Background Art

[0002] Polypropylene (PPR) pipes have the advantages of energy saving, environmental protection, light weight and high strength, corrosion resistance, smooth inner wall without scaling, easy construction and maintenance, and long service life. They are widely used in building water supply and drainage and other fields. At present, PPR pipes are of various types and colors, and the performance of pipes of different colors varies greatly.

[0003] The existing PPR pipes are mainly white, green, gray, yellow, orange, etc. They are mainly made by directly adding masterbatches of different colors, weighing them, blending them with PPR raw materials, and directly conveying them to the barrel for extrusion molding. However, the shapes of the masterbatch material and the polypropylene material are quite different, and the affinity between the two is poor. In the one-time molding production process, the fusion between the masterbatch material and the polypropylene material is uneven during the molding production process, and the dispersion of the masterbatch material in the polypropylene material is poor, which affects the quality of the final product.

[0004] Therefore, a new solution needs to be proposed to solve this problem. Summary of the invention

[0005] The object of the present invention is to overcome the above-mentioned deficiencies of the prior art and to provide a method for preparing polypropylene masterbatch and a masterbatch mixing device which can reduce the interference of pigments.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A masterbatch mixing device comprises an outer cylinder and an inner core, wherein the inner core is coaxially fixedly installed in the outer cylinder, an annular feeding gap is formed between the inner periphery of the outer cylinder and the outer periphery of the inner core, one end of the outer cylinder is a feeding end, and the other end is a discharging end;

[0008] It also includes two ring body members 1, wherein the inner periphery of the ring body member 1 is fixedly connected to the inner core body, and the outer periphery is fixedly connected to the outer cylinder body, the two ring body members 1 are fixedly connected side by side, and an annular cavity is formed between two adjacent ring body members 1, and the ring body member 1 is provided with a through hole 1, and the through hole 1 connects the feeding gap and the annular cavity;

[0009] A rotating disk group is installed in the annular cavity, the rotating disk group is rotatably connected in the annular cavity, and the axis of rotation is coaxial with the inner core body; the rotating disk group is provided with a second through hole, and the second through hole is arranged opposite to the first through hole.

[0010] The present invention is further configured such that the rotating disk group includes two disk bodies, a rotation gap one is formed between two adjacent disk bodies, and a rotation gap two is formed between the two disk bodies and the ring body member one on the corresponding side.

[0011] The present invention is further configured such that a plurality of through holes 1 are provided and are distributed in a ring-shaped interval; a plurality of through holes 2 are provided and are also distributed in a ring-shaped interval; and the rotation directions of the two disks are opposite.

[0012] The present invention is further configured such that an axially arranged inner core cavity is opened at the inner center of the inner core body, the inner core cavity is connected to the annular cavity between the two ring body members 1, and extends toward both axial ends; the two ends of the inner core cavity are respectively connected with material guide pipes, the two material guide pipes are respectively used to transport materials to the two ends of the inner core cavity, and can enter the rotating gap 2 on both sides along the inner core cavity.

[0013] The present invention is further configured to include two ring body parts 2, which are both sleeved and fixedly connected to the outer periphery of the inner core body and are respectively located at the outer positions of the two ends of the inner core cavity; the ring body parts 2 and the inner core body are connected and fixed by a plurality of connecting parts, and a feeding channel connecting the feeding gap is formed between the ring body parts 2 and the inner core body.

[0014] The present invention is further configured such that the ring body member 1 is connected and fixed to the outer cylinder, a material guide hole is provided at the connection portion, one end of the material guide hole is connected to the inner core cavity, and the other end passes through the outer periphery of the ring body member 1 and is connected to a material guide pipe.

[0015] The present invention is further configured such that an inner core shaft is rotatably installed at the inner center of the inner core cavity, the outer periphery of the inner core shaft is rotatably connected to two rotating wheels, the outer periphery of the rotating wheel is fixedly connected to a plurality of rotating blades distributed in a circular array, and the two rotating wheels are respectively located at the two ends of the inner core cavity; the rotating wheel is fixedly connected to the disk body on the corresponding side through a connecting tube.

[0016] The present invention is further configured such that two material guide holes are provided on the outer periphery of the ring body and are coaxially arranged; the two material guide holes are eccentrically arranged and arranged along the tangent direction of the inner core cavity; the ends of the outer peripheries of the two material guide holes are connected with material guide pipes, and the two material guide pipes, the two material guide holes and the inner core cavity are connected to form a material guide channel for material circulation, and the material flowing through the material guide channel is used to drive the rotating wheel to rotate.

[0017] The present invention is further configured to include a feeding pipeline, the material flow directions of the material guide channels at two locations of the two groups of ring members are opposite, and the lower ends of the two material guide channels are connected through the feeding pipeline, and the material flows through the two groups of material guide channels in sequence.

[0018] The present invention also provides a method for preparing a polypropylene masterbatch with reduced pigment interference, wherein 1-2 parts of polypropylene resin and 20-50 parts of high-concentration masterbatch are mixed by mass to form a mixed granular material, which is melt-mixed by a screw extruder to form a polypropylene masterbatch;

[0019] During the mixing process, the masterbatch mixing device as described above is used for mixing, and the mixed granular material is input from the feeding end of the masterbatch mixing device, flows through the feeding gap, and is output from the discharging end;

[0020] The polypropylene masterbatch obtained in the early stage of the mixing process is input from the material guide tube into the inner core cavity and flows through the annular cavity. The prepared polypropylene masterbatch is mixed with the mixed granular material in the annular cavity. On the one hand, the material with relatively poor uniformity in the early stage of mixing can be stirred and mixed again. On the other hand, the mixed granular material flowing through the masterbatch mixing device can be mixed with the early mixed material during the mixing process, which is conducive to the uniform mixing of the mixed granular material.

[0021] In summary, the present invention has the following beneficial effects:

[0022] The masterbatch mixing device can mix a small part of the polypropylene raw material with the masterbatch material to obtain raw material particles with a high concentration of masterbatch, that is, the polypropylene masterbatch material. The polypropylene masterbatch material has a higher masterbatch concentration and has properties that are basically the same as those of ordinary polypropylene raw materials. In the subsequent mixing process, the polypropylene masterbatch material can be efficiently mixed with other polypropylene raw materials, so that the masterbatch material can be efficiently dispersed and mixed into the raw materials, which can improve the color uniformity of the final mixed material.

[0023] In the process of mixing the polypropylene raw material and the masterbatch material, a masterbatch mixing device is used for mixing. During the mixing process, the mixed raw materials pass through two ring bodies, and the two ring bodies are provided with through holes and can generate rotational motion in opposite directions, which can generate shearing force on the passing materials, and can shear the masterbatch material into a structure of multiple small particles, which are mixed with the raw materials in a molten state, thereby enhancing the masterbatch in the mixed material to be further dispersed.

[0024] During the mixing process, the rotational motion of the rotating disk group can be driven by the material input from the branch (material guide tube), so that the rotating wheel in the inner core cavity can produce a rotating motion. The material flowing through the material guide channel can be input from the peripheral direction of the rotating wheel, which can produce a circumferential push on the rotating blades on the outer periphery of the rotating wheel, thereby driving the rotating wheel to rotate. During the rotation of the rotating wheel, the connecting cylinder and the disk body can be driven to rotate, thereby driving the two disk bodies to rotate in opposite directions, and producing a shearing and dispersing effect on the material flowing along the feeding gap. When more materials are input from the branch (material guide tube), the material flowing from the inner core cavity to the annular cavity will also increase accordingly, and the speed at which the material drives the rotating wheel and the disk body to rotate will also be faster, thereby achieving automatic adaptation to each other, ensuring that the two input materials can be mixed more evenly and effectively in the annular cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a cross-sectional view of a masterbatch mixing device in this embodiment;

[0026] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0027] Figure 3 This is a schematic diagram of the structure of the inner core, the first ring body and the second ring body in this embodiment;

[0028] Figure 4 is a cross-sectional view of one part of the ring body in this embodiment;

[0029] Figure 5 Schematic diagram of the structure of a masterbatch mixing device and a feeding pipeline in this embodiment;

[0030] Figure 6 Schematic diagram of the installation structure of the masterbatch mixing device in the process of preparing polypropylene masterbatch in this embodiment.

[0031] Figure numerals: outer cylinder 1; cylinder part 11; cylinder part 2 12; cylinder part 3 13; cylinder part 4 14; feed end 101; discharge end 102; inner core 2; inner core cavity 21; inner core shaft 22; rotating wheel 23; rotating blade 24; connecting cylinder 25; feeding gap 3; ring body 1 4; outer baffle ring 41; annular cavity 42; through hole 1 43; sealing baffle ring 44; rotating disk group 5; disk body 51; through hole 2 52; rotating gap 1 53; rotating gap 2 54; ring body 2 6; connecting part 61; guide hole 62; guide pipe 63; feeding channel 64; feeding pipeline 7; masterbatch mixing device 80; screw extruder 1 81; screw extruder 2 82; insulation storage bin 83; granulator 84. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] This embodiment discloses a masterbatch mixing device, referring to Figure 1-4 As shown, it comprises an outer cylinder 1 and an inner core 2, wherein the inner core 2 is coaxially fixedly installed in the outer cylinder 1 to form a cylindrical structure with inner and outer sleeves.

[0034] An annular feeding gap 3 is formed between the inner periphery of the outer cylinder 1 and the outer periphery of the inner core 2. One end of the outer cylinder 1 is a feeding end 101, and the other end is a discharging end 102. The outer cylinder 1 is divided into several parts, including a plurality of cylinder parts, namely, cylinder part 1 11, cylinder part 2 12, cylinder part 3 13 and cylinder part 4 14. The cylinder part 1 11, cylinder part 2 12, cylinder part 3 13 and cylinder part 4 14 are axially connected and fixed to form the outer cylinder 1.

[0035] The inner core 2 is axially installed in the outer cylinder 1, and the outer periphery of the inner core 2 is connected and fixed to the outer cylinder 1 through multiple ring parts, so that the inner core 2, the outer cylinder 1 and the ring parts are fixedly connected to form a whole.

[0036] Reference Figure 1-Figure 3 As shown, the masterbatch mixing device also includes two ring members 4, the inner periphery of the ring member 4 is fixedly connected to the inner core 2. The outer periphery of the ring member 4 is fixedly connected to the outer cylinder 1, and the two ring members 4 are fixedly connected side by side, and an annular cavity 42 is formed between two adjacent ring members 4. The two ring members 4 overlap each other and are fixedly installed between the cylinder part 11 and the cylinder part 2 12 to form a fixedly connected whole.

[0037] On the outer peripheries of the two ring bodies 4, and on opposite sides, outer retaining rings 41 are fixedly connected, and the two outer retaining rings 41 are pressed against each other to form the outer periphery of the annular cavity 42. In addition, a sealing retaining ring 44 is sleeved and installed on the inner peripheries of the two outer retaining rings 41.

[0038] A through hole 43 is formed in the ring body 4, and the through hole 43 connects the feeding gap 3 and the annular cavity. During the flow of the material, the material flows through the feeding gap 3, passes through the outer retaining ring part 41 in the middle section of the feeding gap 3, and enters the annular cavity 42 from the through hole 43 of the outer retaining ring part 41.

[0039] A rotating disc group 5 is installed in the annular cavity 42, and the rotating disc group 5 is rotatably connected to the annular cavity 42, and the axis of rotation is coaxial with the inner core 2. The rotating disc group 5 is provided with a second through hole 52, and the second through hole 52 is arranged opposite to the first through hole 43. During the rotation of the rotating disc group 5, relative rotation occurs between the rotating disc group 5 and the ring body 1 4, and relative shear occurs between the second through hole 52 and the first through hole 43, which can shear the material into small particles, further shear and refine the pigment particles, and at the same time, the masterbatch base material and the base material can be mixed more evenly.

[0040] The rotating disk group 5 includes two disk bodies 51, a rotating gap 1 53 is formed between two adjacent disk bodies 51, and a rotating gap 2 54 is formed between the two disk bodies 51 and the corresponding side ring body member 1 4, so that the two ring body members 1 4 and the two disk bodies 51 can form a multi-layer structure. The through hole 1 43, the rotating gap 2 54, the through hole 2 52, the rotating gap 1 53, the through hole 2 52, the rotating gap 2 54 and the through hole 1 43 can form a multi-layer channel structure. During the rotation of the two disk bodies 51 in the opposite direction, a shearing action can be formed between each through hole, so that the pigment particles can be further sheared and refined, and a high-concentration polypropylene masterbatch material can be obtained by mixing.

[0041] Reference Figure 2 As shown, a plurality of through holes 1 43 are provided, which are distributed in annular intervals. A plurality of through holes 2 52 are also provided, which are also distributed in annular intervals. The two disk bodies 51 rotate in opposite directions. During the rotation, the through holes 2 52 of the two disk bodies 51 produce rotational shear in opposite directions, thereby mixing the base material in the annular cavity 42. Small particles of the material can be mixed more easily, and a high-concentration polypropylene masterbatch material with better uniformity can be obtained by mixing.

[0042] Reference Figure 1 , Figure 3 As shown, an axially arranged inner core cavity 21 is provided in the inner center of the inner core body 2. The inner core cavity 21 is connected to the annular cavity 42 between the two ring members 1 4 and extends toward both ends of the axial direction. The two ends of the inner core cavity 21 are respectively connected with guide pipes 63, and the two guide pipes 63 are respectively used to transport materials to the two ends of the inner core cavity 21, and can enter the rotating gap 2 54 on both sides along the inner core cavity 21.

[0043] During the mixing process, the polypropylene masterbatch material obtained in the previous mixing is introduced into the inner core cavity 21 , and can be input into the annular cavity 42 along the direction of the inner core cavity 21 . In the annular cavity 42, the polypropylene masterbatch material is located in the rotating gap 2 54 between the ring body 1 4 and the disk body 51, and can flow from the inner periphery to the outer periphery with the internal pressure, and enter the vicinity of the through hole 1 43 and the through hole 2 52; another stream of material flows along the feeding gap 3, and will also flow from the through hole 1 43 through the rotating gap 2 54, and the two streams of material are mixed with each other, and in the mixing process, enter from one side and flow along the through hole 1 43, the rotating gap 2 54, the through hole 2 52, and the rotating gap 1 53, and then flow out from the other side and flow along the through hole 2 52, the rotating gap 2 54 and the through hole 1 43. During the circulation process, the two disk bodies 51 can produce relative rotation, and the material is subjected to multiple shearing effects during the circulation process, so that the material can be sheared into a small particle structure, which is more conducive to the mixing of the material, so that the two streams of material can be mixed more evenly.

[0044] Reference Figure 1 , Figure 3 , Figure 4 As shown, the masterbatch mixing device also includes two ring members 6, which are sleeved and fixedly connected to the outer periphery of the inner core 2 and are respectively located at the outer positions of the two ends of the inner core cavity 21. Figure 1 As shown, the ring body part 2 6 on the left side is axially installed and fixed by the cylinder part 2 12 and the cylinder part 3 13; the ring body part 2 6 on the right side is axially installed and fixed by the cylinder part 1 11 and the cylinder part 4 14, so that the two ring body parts 2 6 can be assembled with the various parts of the outer cylinder 1 to form an integral structure.

[0045] Reference Figure 4 As shown, the ring body 2 6 is connected and fixed to the inner core 2 by a plurality of connecting parts 61, and the connecting part 61 is divided into three parts, and a feeding channel 64 connected to the feeding gap 3 is formed between the ring body 2 6 and the inner core 2. A feeding channel 64 is formed between adjacent connecting parts 61, and the feeding channel 64 can be used for the mixed material to flow.

[0046] Reference Figure 3 , Figure 4 As shown, the ring body 4 is connected and fixed to the outer cylinder 1, and a material guide hole 62 is opened at the connection part 61. One end of the material guide hole 62 is connected to the inner core cavity 21, and the other end passes through the outer periphery of the ring body 4 and is connected to a material guide pipe 63. The end of the material guide pipe 63 is installed and extended into the material guide hole 62, forming a branch for material supply at the outer periphery.

[0047] An inner core shaft 22 is rotatably mounted in the inner center of the inner core cavity 21, and two rotating wheels 23 are rotatably connected to the outer periphery of the inner core shaft 22. A plurality of rotating blades 24 distributed in a circumferential array are fixedly connected to the outer periphery of the rotating wheel 23, so that the rotating wheel 23 and the rotating blades 24 form an integral impeller structure. The two rotating wheels 23 are respectively located at the two ends of the inner core cavity 21, with the inner core shaft 22 as the central support, so that the two rotating wheels 23 can realize axial rotation.

[0048] The rotating wheel 23 is connected and fixed to the disk body 51 on the corresponding side through the connecting tube 25, that is, the rotating wheel 23, the connecting tube 25 and the disk body 51 on the left side can be connected to form a whole, and the rotating wheel 23, the connecting tube 25 and the disk body 51 on the right side can also be connected to form a whole, so as to form two groups of components. The material flowing into the inner core cavity 21 from the material guide hole 62 can drive the rotating wheel 23 and the rotating blade 24 to produce an axial rotation movement, and then drive the disk body 51 through the connecting tube 25, and then the materials input from both sides can respectively drive the two disk bodies 51 to produce relative rotation. In the process of material input, the faster the speed of the material input from the material guide hole 62, the faster the rotation speed applied to the rotating wheel 23 and the rotating blade 24, and the faster the relative rotation speed of the two disk bodies 51, which can more efficiently adapt to the mixing and shear dispersion of multiple materials, and help to form a more uniform polypropylene masterbatch material.

[0049] Specifically, two guide holes 62 are provided on the outer periphery of the ring body 4 and are coaxially arranged. The axial directions of the two guide holes 62 are eccentrically arranged relative to the inner core cavity 21 and are arranged substantially along the tangent direction of the inner core cavity 21. Figure 4 As shown, the two material guide holes 62 are oriented in the vertical axial direction and are close to the right side chamber of the inner core cavity 21 .

[0050] The ends of the outer peripheries of the two material guide holes 62 are connected with material guide pipes 63. The two material guide pipes 63, the two material guide holes 62 and the inner core cavity 21 are connected to form a material guide channel for material flow. The material flowing through the material guide channel can be input from the outer periphery of the rotating wheel 23, and can generate a circumferential push on the rotating blades 24 on the outer periphery of the rotating wheel 23, thereby driving the rotating wheel 23 to rotate. During the rotation of the rotating wheel 23, the connecting cylinder 25 and the disc body 51 can be driven to rotate.

[0051] Reference Figure 4 , Figure 5As shown, during the material input process, the material guide tube 63 at one end can be used for material input, and the material guide tube 63 at the other end can be used for material output. By controlling the input amount of the material on the input side and the material output amount of the material on the output side, and keeping the input amount on the input side greater than the output amount on the output side, it can be ensured that part of the material can be input into the inner core cavity 21 as a whole, and the excess material can flow along the material guide tube 63 on the input side, the inner core cavity 21 and the inner core cavity 21 on the output side, so as to realize the material circulation and drive the rotating wheel 23.

[0052] Further, refer to Figure 5 As shown, the masterbatch mixing device in this embodiment also includes a feeding pipeline 7. The material flow directions of the material guide channels at the two groups of ring body parts 6 are opposite, and the lower ends of the two downwardly arranged material guide pipes 63 are connected through the feeding pipeline 7, so that the material can flow through the two groups of material guide channels in sequence.

[0053] During the material flow process, the input end of the material is the guide tube 63 facing upward on the left side, which first flows through the ring body 2 6 on the left side, and enters the inner core cavity 21 of the inner core body 2 from the guide hole 62, driving the rotating wheel 23, the connecting cylinder 25 and the disc body 51 to rotate, and a part of the material flows from the inner core cavity 21 through the annular cavity 42, and can be mixed with the mixed material flowing in the feeding gap 3; the other part of the material flows downward from the inner core cavity 21, passes through the guide hole 62, and is output from the guide tube 63 facing downward on the left side, and then flows through the feeding pipeline 7 to feed the guide tube 63 facing downward on the right side;

[0054] The material continues to be input from the downward material guide tube 63 on the right side, first flows through the ring body part 6 on the right side, and enters the inner core cavity 21 of the inner core body 2 from the material guide hole 62, driving the rotating wheel 23, the connecting cylinder 25 and the disk body 51 to rotate. A part of the material flows from the inner core cavity 21 through the annular cavity 42 and can be mixed with the mixed material flowing in the feeding gap 3; the other part of the material flows upward from the inner core cavity 21, passes through the material guide hole 62, and is output from the upward material guide tube 63 on the right side, thereby realizing the circulation of this part of the material.

[0055] The present embodiment also provides a method for preparing a polypropylene masterbatch with reduced pigment interference. 50-80 parts of polypropylene resin and 20-50 parts of high-concentration masterbatch are mixed by mass to form a mixed granular material, which is then melt-mixed by a screw extruder to form a polypropylene masterbatch.

[0056] In the mixing process, the masterbatch mixing device as described above is used for mixing, and the mixed granules are input from the feed end 101 of the masterbatch mixing device, flow through the feeding gap 3, and output from the discharge end 102. In addition, the feed end 101 and the discharge end 102 of the masterbatch mixing device are respectively connected to the screw extruder.

[0057] Reference Figure 6As shown, the input end of the screw extruder 81 is supplied with mixed granular material, and the output end of the screw extruder 81 is connected to the above-mentioned masterbatch mixing device 80, and is specifically connected to the feed end 101 of the masterbatch mixing device 80; the discharge end 102 of the masterbatch mixing device 80 is connected to the input end of the screw extruder 82, and the output end of the screw extruder 82 is connected to the heat-insulating storage bin 83, in which the mixed material can be temporarily stored to keep the mixed material in a molten flowing state.

[0058] In the mixing production process, in the early stage of mixing, all the materials output from the screw extruder 2 82 flow into the insulated storage bin 83, and the materials stored in the insulated storage bin 83 are input from the guide pipe 63 to the masterbatch mixing device 80, and flow through the four groups of guide pipes 63 and the feeding pipeline 7 in sequence, so that the input part of the materials obtained by the early mixing can be input into the masterbatch mixing device 80, and mixed with the molten material of the mixed granular material. Since the materials input from the guide pipe 63 have been mixed in the early stage and are basically in a uniform mixed state, mixing again can further improve the final mixture to be able to be evenly dispersed, forming a polypropylene masterbatch material with a high concentration.

[0059] After the equipment maintains stability, part of the material output from the screw extruder 82 flows to the heat preservation storage bin 83, and part of the material flows to the granulator 84 to granulate the polypropylene masterbatch to form polypropylene masterbatch particles. Part of the polypropylene masterbatch material will re-enter the heat preservation storage bin 83 to form a circulation flow. During the circulation process, it can continue to be stirred and mixed with other materials, re-cut into small particles, and then re-mixed, which can improve the dispersion of the masterbatch in the mixed material, and further improve the material uniformity of the polypropylene masterbatch.

[0060] During use, according to the required proportion of masterbatches, the corresponding proportion of polypropylene particles are mixed with the prepared polypropylene masterbatch particles to obtain a mixture of polypropylene masterbatch and polypropylene particles; the mixture is mixed and put into a screw extruder for mixing, so as to obtain a production raw material with uniform color, and the production raw material is input into the corresponding mold for production.

[0061] By mixing the masterbatch material with a small portion of the raw material, raw material particles with a high concentration of masterbatch are obtained. During the processing, the masterbatch material can be mixed through a continuous multi-pass mixing process. During the mixing process, the masterbatch material is sheared into a structure of multiple small particles, mixed with the raw material in a molten state, and multi-pass processing is performed, so that the masterbatch can be sufficiently dispersed, and thus a high-concentration masterbatch mixed material can be prefabricated in advance. Since most of the masterbatch mixed material is the base material raw material, the performance of the material is basically the same as the base material in the subsequent production process, and thus the high-concentration masterbatch mixed material and the base material can be mixed more efficiently. During the mixing process, the masterbatch material can be evenly mixed into the raw materials for production, so that the masterbatch material has better dispersibility and improves the color uniformity of the product.

[0062] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A masterbatch mixing device, characterized in that: The invention comprises an outer cylinder (1) and an inner core (2), wherein the inner core (2) is coaxially fixedly installed in the outer cylinder (1), an annularly distributed feeding gap (3) is formed between the inner periphery of the outer cylinder (1) and the outer periphery of the inner core (2), one end of the outer cylinder (1) is a feeding end (101), and the other end is a discharging end (102); It also comprises two ring body members (4), the inner periphery of the ring body member (4) is fixedly connected to the inner core (2), and the outer periphery is fixedly connected to the outer cylinder (1), the two ring body members (4) are fixedly connected side by side, and an annular cavity (42) is formed between two adjacent ring body members (4), and the ring body member (4) is provided with a through hole (43), and the through hole (43) communicates with the feeding gap (3) and the annular cavity (42); A rotating disk group (5) is installed in the annular cavity (42), and the rotating disk group (5) is rotatably connected to the annular cavity (42), and the axis of rotation is coaxial with the inner core (2); the rotating disk group (5) is provided with a second through hole (52), and the second through hole (52) is arranged opposite to the first through hole (43).

2. The masterbatch mixing device according to claim 1, characterized in that: The rotating disk group (5) comprises two disk bodies (51), a rotating gap one (53) is formed between two adjacent disk bodies (51), and a rotating gap two (54) is formed between the two disk bodies (51) and the ring body part one (4) on the corresponding side.

3. The masterbatch mixing device according to claim 2, characterized in that: The first through holes (43) are provided in a plurality and are distributed in an annular pattern; the second through holes (52) are provided in a plurality and are also distributed in an annular pattern; and the two disk bodies (51) rotate in opposite directions.

4. The masterbatch mixing device according to claim 2, characterized in that: An axially arranged inner core cavity (21) is provided at the inner center of the inner core body (2), and the inner core cavity (21) is connected to the annular cavity (42) between the two ring body members (4) and extends toward both axial ends; the two ends of the inner core cavity (21) are respectively connected to material guide pipes (63), and the two material guide pipes (63) are respectively used to transport materials to the two ends of the inner core cavity (21), and can enter the rotating gap (54) on both sides along the inner core cavity (21).

5. The masterbatch mixing device according to claim 4, characterized in that: It also includes two ring body parts (6), which are both sleeved and fixedly connected to the outer periphery of the inner core body (2) and are respectively located at the outer sides of the inner core cavity (21); the ring body part (6) and the inner core body (2) are connected and fixed by a plurality of connecting parts (61), and a feeding channel (64) connected to the feeding gap (3) is formed between the ring body part (6) and the inner core body (2).

6. The masterbatch mixing device according to claim 5, characterized in that: The ring body part 1 (4) is connected and fixed to the outer cylinder (1), and a material guide hole (62) is provided at the connecting portion (61). One end of the material guide hole (62) is connected to the inner core cavity (21), and the other end passes through the outer periphery of the ring body part 1 (4) and is connected to a material guide pipe (63).

7. The masterbatch mixing device according to claim 6, characterized in that: An inner core shaft (22) is rotatably mounted at the inner center of the inner core cavity (21); two rotating wheels (23) are rotatably connected to the outer periphery of the inner core shaft (22); a plurality of rotating blades (24) distributed in a circumferential array are fixedly connected to the outer periphery of the rotating wheel (23); the two rotating wheels (23) are respectively located at the two ends of the inner core cavity (21); the rotating wheel (23) is fixedly connected to the disk body (51) on the corresponding side via a connecting tube (25).

8. The masterbatch mixing device according to claim 7, characterized in that: The ring body member 1 (4) has two material guide holes (62) on its outer periphery, which are coaxially arranged. The two material guide holes (62) are eccentrically arranged and arranged along the tangent direction of the inner core cavity (21). The ends of the outer peripheries of the two material guide holes (62) are connected with material guide pipes (63). The two material guide pipes (63), the two material guide holes (62) and the inner core cavity (21) are connected to form a material guide channel for material circulation. The material circulating through the material guide channel is used to drive the rotating wheel (23) to rotate.

9. The masterbatch mixing device according to claim 8, characterized in that: It also includes a feeding pipeline (7), the material flow directions of the material guide channels at the two groups of ring body parts (6) are opposite, and the lower ends of the two material guide channels are connected through the feeding pipeline (7), and the material flows through the two groups of material guide channels in sequence.

10. A method for preparing a polypropylene masterbatch with reduced pigment interference, characterized in that: 50-80 parts of polypropylene resin and 20-50 parts of high-concentration masterbatch are mixed by weight to form mixed granules, and then melt-mixed by a screw extruder to form a polypropylene masterbatch; During the mixing process, the masterbatch mixing device as described in any one of claims 1 to 9 is used for mixing, and the mixed granular material is input from the feeding end (101) of the masterbatch mixing device, flows through the feeding gap (3), and is output from the discharging end (102); The mixed polypropylene masterbatch is input from the material guide pipe (63) into the inner core cavity (21) and flows through the annular cavity (42), and the prepared polypropylene masterbatch is mixed with the mixed granular material in the annular cavity (42).

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