Engineering plastic toughening agent adding device and method

Abstract

The application relates to the field of chemical reagent adding equipment, in particular to engineering plastic toughening agent adding equipment and a method, which comprises a base, a driving device, an adding device and a spiral extrusion device arranged on the base, a fixing support is arranged on the base, the spiral extrusion device comprises a machine cylinder arranged on the fixing support, a main conveying screw rod and at least two auxiliary conveying screw rods arranged in the machine cylinder, the machine cylinder comprises a first stirring conveying end and a second stirring conveying end which are connected with each other, the main conveying screw rod is arranged in the first stirring conveying end and extends into the second stirring conveying end, and the auxiliary conveying screw rods are arranged in the first stirring conveying end and surround the main conveying screw rod, so that the technical problem that the existing toughening agent with large dispersion difficulty is difficult to uniformly disperse in the material when being added into the plastic, condensation and agglomeration are caused, and the quality of finished products is uneven in the later period is solved.

Description

Technical Field

[0001] This invention relates to the field of chemical reagent addition equipment, and more particularly to an equipment and method for adding toughening agents to engineering plastics. Background Technology

[0002] Engineering plastic toughening agents are key additives that improve the impact resistance of plastics, effectively prevent brittleness, and are widely used in the automotive, electronics, and packaging industries.

[0003] Common toughening agents for engineering plastics include POE (polyolefin elastomer), EVA (ethylene-vinyl acetate copolymer), and EPDM (ethylene propylene diene monomer rubber). These toughening agents have different properties. For example, POE has good compatibility with the PE matrix and a significant toughening effect, especially in low-temperature environments, but its cost is relatively high. EVA has a lower cost and better processability, but its anti-aging properties are poor and its performance is prone to degradation with long-term use. EPDM has excellent heat resistance and weather resistance, making it suitable for high-temperature or outdoor environments, but its cost is high and it is difficult to disperse.

[0004] Toughening agents differ from conventional chemical additives, and their addition involves several key points: First, the type of plastic must be determined before addition, as different plastics require different toughening agents. Second, the addition ratio must be strictly controlled. For example, when using TPE as a toughening agent, the addition ratio is generally 5%-15%, and should not exceed 20%. Excessive addition may affect the strength, rigidity, and transparency of the plastic. Third, thorough mixing and temperature control are essential during the addition process. Only when the toughening agent is evenly distributed within the plastic matrix can the quality of the finished product be guaranteed. Furthermore, toughening agents may degrade at high temperatures, so strict control of the processing temperature is necessary.

[0005] Chinese patent application number 202211462826.0 discloses a modified PET engineering plastic for communication equipment and its preparation method. The modified PET engineering plastic for communication equipment is made from the following raw materials in weight percentages: PET, modified talc, toughening agent, and antioxidant. This invention improves the thermal stability and impact resistance of PET, as well as its processability, by adding modified talc and toughening agent to PET. The modified talc used in this application has a strong nucleation effect, which can effectively change the nucleation mode of PET, reduce the crystallization temperature of PET, and improve the thermal stability of PET engineering plastic. Furthermore, the combination of modified talc and toughening agent significantly improves the notched impact strength of PET engineering plastic. In addition, the melt index of PET engineering plastic is also reduced, improving its processing performance when used in optical fiber cable sheathing. The technical solution proposed in the above invention improves the raw material composition, but it does not improve the mixing and stirring steps required during the addition process. If conventional equipment is used for addition, it is easy to cause agglomeration and clustering of toughening agents such as EPDM (ethylene propylene diene monomer rubber), which are difficult to disperse. Summary of the Invention

[0006] Therefore, in response to the above problems, this invention proposes an engineering plastic toughening agent addition device and method, which solves the technical problem that existing toughening agents with high dispersion difficulty are difficult to disperse evenly in the material when added to plastics, causing agglomeration and resulting in inconsistent quality of finished products.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: an engineering plastic toughening agent addition device, comprising a base and a driving device, an addition device, and a screw extrusion device disposed on the base, characterized in that: a fixed support is disposed on the base, the screw extrusion device comprises a barrel disposed on the fixed support, a main conveying screw disposed within the barrel, and at least two auxiliary conveying screws, the barrel comprising a first mixing conveying end and a second mixing conveying end connected to each other, the main conveying screw being disposed within the first mixing conveying end and extending into the second mixing conveying end, the auxiliary conveying screws being disposed within the first mixing conveying end and surrounding the main conveying screw, the main conveying screw being disposed on the central axis of the barrel, and the auxiliary conveying screws reciprocatingly moving towards and away from the main conveying screw through a functional coordination device.

[0008] Furthermore, the driving device includes a first driving motor, a second driving motor, and a third driving motor. The first driving motor is used to drive the functional coordination device, the second driving motor is used to drive the auxiliary conveying screw, and the third driving motor is used to drive the main conveying screw.

[0009] Furthermore, the diameter of the first stirring conveyor end is three times the diameter of the second stirring conveyor end, and the connection between the first stirring conveyor end and the second stirring conveyor end is transitioned by a tapered end.

[0010] Furthermore, the functional coordination device includes a functional turntable disposed on the fixed bracket, a movable slide groove disposed on the functional turntable, and the second drive motor is engaged in the movable slide groove.

[0011] Furthermore, the movable chute is an elongated trough, with a first push rod and a second push rod respectively provided at both ends. The first push rod and the second push rod are driven out by the first drive motor. The first push rod and the second push rod abut against both ends of the second drive motor. The push of the first push rod and the second push rod controls the movement of the second drive motor within the movable chute. The auxiliary conveying screw is fixedly connected to the output end of the second drive motor and extends into the first stirring and conveying end. Driven by the second drive motor, the auxiliary conveying screw rotates 360° along its own axis and moves along the length of the movable chute with the second drive motor, approaching or moving away from the main conveying screw. Driven by the second drive motor, the auxiliary conveying screw rotates in the forward or reverse direction, and the rotation direction of all the auxiliary conveying screws is the same.

[0012] Furthermore, the adding device includes a feed inlet disposed on the barrel, a feed funnel fixedly disposed on the feed inlet, and a shaking mechanism disposed on the feed funnel near the feed inlet side, wherein the shaking mechanism impacts and disperses the added mixed raw materials.

[0013] Furthermore, the material shaking mechanism includes a vibratory plate and a connecting rod. The connecting rod is used to connect the vibratory plate and the feed funnel. A vibration motor is integrated inside the vibratory plate to drive the vibratory plate to vibrate.

[0014] Furthermore, an annular rotating disk is provided on the inner side of the conical end of the barrel. The annular rotating disk fits against the inner side of the conical end and rotates 360° along its own axis in the opposite direction to the main conveying screw. A stirring rod is arranged around the annular rotating disk. The stirring rod is perpendicular to the annular rotating disk and points towards the main conveying screw. The stirring rod is an electric telescopic rod that can extend and retract along its own axis with a travel of 1-2 cm.

[0015] A method for adding an engineering plastic toughening agent, using an engineering plastic toughening agent adding device, includes the following steps:

[0016] S1. Raw material preparation: Clean the raw plastic matrix to ensure that the raw material is free of impurities;

[0017] S2. Raw material mixing: The plastic raw material and toughening agent are mixed in proportion. The plastic raw material is PP and the toughening agent is EPDM. The amount of EPDM added is 5%. After the two are premixed, they are added into the barrel through the feed port. During the addition process, the second drive motor and the third drive motor are started in sequence. The auxiliary conveying screw and the main conveying screw start to rotate. In the initial state, the auxiliary conveying screw is close to the main conveying screw.

[0018] S3. First-stage enhanced mixing: When the mixed raw materials follow the auxiliary conveying screw and the main conveying screw to half the stroke of the first mixing and conveying end, the first drive motor starts to work, driving the auxiliary conveying screw to perform a reciprocating motion of approaching and moving away from the main conveying screw;

[0019] S4. Second-stage enhanced mixing: When the mixed raw materials follow the auxiliary conveying screw and the main conveying screw to fill the first mixing conveying end, the annular rotating disk begins to rotate and drives the mixing rod to carry out the mixing operation. While the mixing rod rotates and mixes, it also performs its own extension and retraction movements.

[0020] S5, Finished product output: The mixed raw materials are output through the second mixing and conveying end and connected to the injection molding machine for subsequent molding processing.

[0021] Furthermore, in step S2, the auxiliary conveying screw and the main conveying screw rotate in the same direction, while in step S3, the auxiliary conveying screw and the main conveying screw rotate in opposite directions.

[0022] By adopting the aforementioned technical solution, the beneficial effects of the present invention are:

[0023] 1. This invention solves the technical problem of existing toughening agents, which are difficult to disperse evenly in plastics, causing agglomeration and resulting in inconsistent product quality, by improving the structure of the equipment for adding toughening agents to engineering plastics. The main improvements are concentrated on the conveying screw in the barrel and the addition of an auxiliary stirring structure. The mixing and conveying efficiency is improved by the cooperation of multiple components. Compared with the traditional twin-screw conveying structure, this invention adopts a mixing and conveying method in which the main conveying screw and the auxiliary conveying screw cooperate. The main conveying screw undertakes the main conveying work, while the auxiliary conveying screw is arranged around the main conveying screw to provide auxiliary stirring and conveying operations, and to extrude and convey the mixed raw materials.

[0024] 2. In this invention, the auxiliary conveying screw is driven by a functional coordination device. The functional turntable in the functional coordination device ensures that the auxiliary conveying screw can be arranged around the main conveying screw. At the same time, the movable slide in the functional coordination device allows the auxiliary conveying screw to be displaced as a whole during rotation. This allows the auxiliary conveying screw to perform a reciprocating motion of approaching and moving away from the main conveying screw while simultaneously performing helical conveying. During the movement, the mixed raw material stored between the main conveying screw and the auxiliary conveying screw is deeply compressed. At the same time, its reciprocating motion can also change the spatial position of the mixed raw material to a certain extent, avoiding blockage in the barrel. The density of the mixed raw material is also increased during the compression and conveying process.

[0025] 3. In this invention, by setting up a shaking mechanism, the vibrating plate on the shaking mechanism can buffer the mixed raw materials when they come into contact with each other. On the other hand, the mixed raw materials will be scattered and evenly distributed after contacting the vibrating plate due to the structure and vibration effect of the vibrating plate. This ensures that the mixed raw materials have undergone a first round of uniform mixing before contacting the shaking mechanism, and then enter the barrel in a scattered state.

[0026] 4. In this invention, an annular rotating disk is provided on the inner side of the conical end inside the barrel, and a stirring rod is arranged around the rotating disk. The stirring rod will follow the rotation of the annular rotating disk to perform stirring operations. At the same time, the stirring rod is an electric telescopic rod, which simultaneously starts its own extension and contraction action during the stirring process, reducing the frictional resistance during the stirring process. At the same time, during this extension and contraction process, it has a pushing effect on the mixed raw materials towards the center, which is conducive to the mixed raw materials concentrating towards the center of the barrel and continuing to enter the second stirring and conveying end under the spiral conveying of the main conveying screw.

[0027] 5. The method of using matching addition equipment proposed in this invention innovatively adopts one-stage enhanced stirring and two-stage enhanced stirring. First, its equipment structure is completely different from the existing twin-screw extruder. Second, the one-stage enhanced stirring and the two-stage enhanced stirring work in a progressive manner, and different structures are activated to perform spiral stirring and propulsion, which ensures that the plastic raw materials and toughening agents are uniformly mixed during the conveying of the mixed raw materials in the barrel. Attached Figure Description

[0028] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0029] Figure 1 This is a schematic diagram of the overall structure of the device of the present invention;

[0030] Figure 2 This is a schematic diagram of the internal structure of the barrel of the present invention;

[0031] Figure 3 This is a schematic diagram of the functional turntable structure of the present invention;

[0032] Figure 4 This is a vertical cross-sectional view of the main conveying screw and the auxiliary conveying screw of the present invention;

[0033] Figure 5 This is a schematic diagram of the annular rotating disk structure of the present invention;

[0034] Figure 6 This is a schematic diagram of the internal structure of the feed funnel of the present invention;

[0035] Figure 7 This is a top view schematic diagram of the material shaking mechanism of the present invention;

[0036] Figure 8 This is a flowchart of the method of the present invention. Detailed Implementation

[0037] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0038] Please see Figures 1-8This invention provides an engineering plastic toughening agent adding device, including a base 1 and a driving device, an adding device, and a screw extrusion device disposed on the base 1. A fixed support 11 is provided on the base 1. The screw extrusion device includes a barrel 2 disposed on the fixed support 11, a main conveying screw 4 disposed within the barrel 2, and two auxiliary conveying screws 5. The barrel 2 includes a first stirring conveying end 21 and a second stirring conveying end 22 connected to each other. The main conveying screw 4 is disposed within the first stirring conveying end 21 and extends into the second stirring conveying end 22. The auxiliary conveying screws 5 are disposed within the first stirring conveying end 21 and surround the main conveying screw 4. The main conveying screw 4 is disposed on the central axis of the barrel 2. The auxiliary conveying screws 5 reciprocate towards and away from the main conveying screw 4 through a functional coordination device, providing auxiliary screw extrusion. The functional coordination device includes a functional turntable 7 disposed on the fixed support 11 and a movable groove 71 disposed on the functional turntable 7. The second drive motor is mounted in the movable chute 71, which is a long strip-shaped chute. A first push rod 72 and a second push rod 73 are respectively provided at both ends of the movable chute 71. The first push rod 72 and the second push rod 73 are driven out by the first drive motor. The first push rod 72 and the second push rod 73 abut against both ends of the second drive motor. The pushing action of the first push rod 72 and the second push rod 73 controls the movement of the second drive motor within the movable chute 71. The auxiliary conveying screw 5 is fixedly connected to the output end of the second drive motor and extends into the first stirring and conveying end 21. Driven by the second drive motor, the auxiliary conveying screw 5 rotates 360° along its own axis and moves along the length of the movable chute 71, approaching or moving away from the main conveying screw 4. Driven by the second drive motor, the auxiliary conveying screw 5 rotates in either the forward or reverse direction, with all auxiliary conveying screws 5 rotating in the same direction.

[0039] The driving device includes a first driving motor, a second driving motor, and a third driving motor. The first driving motor is used to drive the functional coordination device, the second driving motor is used to drive the auxiliary conveying screw 5, and the third driving motor is used to drive the main conveying screw 4. The first driving motor, the second driving motor, and the third driving motor are all conventional driving devices with driving components for rotation or movement. The diameter of the first stirring conveying end 21 is three times the diameter of the second stirring conveying end 22. The connection between the first stirring conveying end 21 and the second stirring conveying end 22 is transitioned by a tapered end 211.

[0040] The adding device includes a feed inlet on the barrel, a feed funnel 3 fixedly mounted on the feed inlet, and a shaking mechanism 8 mounted on the feed funnel 3 near the feed inlet. The shaking mechanism 8 impacts and disperses the added mixed raw materials. The shaking mechanism 8 includes a vibrating plate 81 and a connecting rod 82. The connecting rod 82 connects the vibrating plate 81 and the feed funnel 3. The vibrating plate 81 integrates a vibration motor to drive the vibrating plate 81 to vibrate.

[0041] An annular rotating disk 6 is provided on the inner side of the conical end 211 of the barrel 2. The annular rotating disk 6 fits against the inner side of the conical end 211. The annular rotating disk 6 rotates 360° along its own axis and its rotation direction is opposite to that of the main conveying screw 4. A stirring rod 61 is arranged around the annular rotating disk 6. The stirring rod 61 is perpendicular to the annular rotating disk 6 and points towards the main conveying screw 4. The stirring rod 61 is an electric telescopic rod that can extend and retract along its own axis with a telescopic stroke of 2 cm.

[0042] This embodiment also proposes a method for adding toughening agents to engineering plastics, which utilizes an engineering plastics toughening agent adding device and includes the following steps:

[0043] S1. Raw material preparation: Clean the raw plastic matrix to ensure that the raw material is free of impurities;

[0044] S2. Raw material mixing: The plastic raw material and toughening agent are mixed in proportion. The plastic raw material is PP and the toughening agent is EPDM, with EPDM added at 5%. After premixing, the two are added into the barrel through the feed inlet. During the addition process, the second drive motor and the third drive motor are started in sequence, and the auxiliary conveying screw 5 and the main conveying screw 4 start to rotate. In the initial state, the auxiliary conveying screw 5 is close to the main conveying screw 4 to facilitate the mixed raw material entering the barrel 2.

[0045] S3. First stage of enhanced mixing: When the mixed raw materials follow the auxiliary conveying screw 5 and the main conveying screw 4 to half the stroke of the first mixing and conveying end 21, the first drive motor starts to work, driving the auxiliary conveying screw 5 to perform a reciprocating motion of approaching and moving away from the main conveying screw 4;

[0046] S4. Second stage enhanced mixing: When the mixed raw materials follow the auxiliary conveying screw 5 and the main conveying screw 4 to fill the first mixing and conveying end 21, the annular rotating disk 6 starts to rotate and drives the mixing rod 61 to carry out mixing operations. While the mixing rod 61 rotates and mixes, it also performs extension and retraction movements.

[0047] S5, Finished product output: The mixed raw materials are output through the second mixing and conveying end 22 and connected to the injection molding machine for subsequent molding processing.

[0048] In step S2, the auxiliary conveying screw 5 and the main conveying screw 4 rotate in the same direction, while in step S3, the auxiliary conveying screw 5 and the main conveying screw 4 rotate in opposite directions.

[0049] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0050] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An engineering plastic toughening agent adding device, comprising a base and a driving device, an adding device, and a screw extrusion device disposed on the base, characterized in that: A fixed support is provided on the base. The screw extrusion device includes a barrel on the fixed support, a main conveying screw and at least two auxiliary conveying screws disposed in the barrel. The barrel includes a first mixing and conveying end and a second mixing and conveying end connected to each other. The main conveying screw is disposed in the first mixing and conveying end and extends into the second mixing and conveying end. The auxiliary conveying screws are disposed in the first mixing and conveying end and are arranged around the main conveying screw. The main conveying screw is disposed on the central axis of the barrel. The auxiliary conveying screws reciprocate by moving closer to and away from the main conveying screw through a functional coordination device.

2. The engineering plastic toughening agent addition device according to claim 1, characterized in that: The driving device includes a first driving motor, a second driving motor, and a third driving motor. The first driving motor is used to drive the functional coordination device, the second driving motor is used to drive the auxiliary conveying screw, and the third driving motor is used to drive the main conveying screw.

3. The engineering plastic toughening agent addition device according to claim 2, characterized in that: The diameter of the first stirring conveyor end is three times the diameter of the second stirring conveyor end, and the connection between the first stirring conveyor end and the second stirring conveyor end is transitioned by a tapered end.

4. The engineering plastic toughening agent addition device according to claim 3, characterized in that: The functional coordination device includes a functional turntable mounted on the fixed bracket and a movable slide groove mounted on the functional turntable, with the second drive motor engaged in the movable slide groove.

5. The engineering plastic toughening agent addition device according to claim 4, characterized in that: The movable chute is a long, narrow trough. A first push rod and a second push rod are respectively installed at both ends of the movable chute. The first and second push rods are driven out by the first drive motor. The first and second push rods abut against both ends of the second drive motor. The pushing action of the first and second push rods controls the movement of the second drive motor within the movable chute. The auxiliary conveying screw is fixedly connected to the output end of the second drive motor and extends into the first stirring and conveying end. Driven by the second drive motor, the auxiliary conveying screw rotates 360° along its own axis and moves along the length of the movable chute, approaching or moving away from the main conveying screw. Driven by the second drive motor, the auxiliary conveying screw rotates in either the forward or reverse direction, and all auxiliary conveying screws rotate in the same direction.

6. The engineering plastic toughening agent addition device according to claim 5, characterized in that: The adding device includes a feed inlet on the barrel, a feed funnel fixedly mounted on the feed inlet, and a shaking mechanism mounted on the feed funnel near the feed inlet, which disperses the added mixed raw materials by impact.

7. The engineering plastic toughening agent addition device according to claim 6, characterized in that: The material shaking mechanism includes a vibratory plate and a connecting rod. The connecting rod is used to connect the vibratory plate and the feed hopper. The vibratory plate is equipped with a vibration motor to drive the vibratory plate to vibrate.

8. The engineering plastic toughening agent addition device according to claim 7, characterized in that: An annular rotating disk is provided on the inner side of the conical end of the barrel. The annular rotating disk fits against the inner side of the conical end and rotates 360° along its own axis in the opposite direction to the main conveying screw. A stirring rod is arranged around the annular rotating disk. The stirring rod is perpendicular to the annular rotating disk and points towards the main conveying screw. The stirring rod is an electric telescopic rod that can extend and retract along its own axis with a stroke of 1-2 cm.

9. A method for adding an engineering plastic toughening agent, wherein the method uses the engineering plastic toughening agent adding equipment as described in claim 8, characterized in that: Includes the following steps: S1. Raw material preparation: Clean the raw plastic matrix to ensure that the raw material is free of impurities; S2, Raw material mixing; The plastic raw material and toughening agent are mixed in proportion. The plastic raw material is PP and the toughening agent is EPDM, with EPDM added at a rate of 5%. After premixing, the two are added into the barrel through the feed inlet. During the addition process, the second drive motor and the third drive motor are started in sequence, and the auxiliary conveying screw and the main conveying screw start to rotate. In the initial state, the auxiliary conveying screw is close to the main conveying screw. S3. First-stage enhanced mixing: When the mixed raw materials follow the auxiliary conveying screw and the main conveying screw to half the stroke of the first mixing and conveying end, the first drive motor starts to work, driving the auxiliary conveying screw to perform a reciprocating motion of approaching and moving away from the main conveying screw; S4. Second-stage enhanced mixing: When the mixed raw materials follow the auxiliary conveying screw and the main conveying screw to fill the first mixing conveying end, the annular rotating disk starts to rotate and drives the mixing rod to carry out the mixing operation. While the mixing rod rotates and mixes, it also performs its own extension and retraction movements. S5, Finished product output: The mixed raw materials are output through the second mixing and conveying end and connected to the injection molding machine for subsequent molding processing.

10. A method for adding an engineering plastic toughening agent according to claim 9, characterized in that: In step S2, the auxiliary conveying screw and the main conveying screw rotate in the same direction, while in step S3, the auxiliary conveying screw and the main conveying screw rotate in opposite directions.

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