A pre-mixing device for thermoplastic elastomer production

Abstract

The utility model discloses a kind of premixing devices for thermoplastic elastomer production, belong to thermoplastic elastomer production field, comprising: premixing tank with inlet and outlet;Stirring assembly, including motor and transmission shaft, the stator of motor is connected to premixing tank outside, the rotor of motor passes through premixing tank, and is connected with transmission shaft, transmission shaft is sequentially connected with upper propeller, middle scattering paddle and bottom scraper paddle, the suction surface of upper propeller faces inlet, the thrust surface of upper propeller faces middle scattering paddle, bottom scraper paddle is close to the bottom and side wall in premixing tank;Heating assembly, heating assembly is distributed on the bottom and side wall outside premixing tank, heating assembly is also distributed on the top in premixing tank.The technical effect of the utility model is that it is not only good premixing uniformity, and heating uniformity is good.

Description

Technical Field

[0001] This utility model relates to the production of thermoplastic elastomers, and more particularly to a premixing device for the production of thermoplastic elastomers. Background Technology

[0002] Thermoplastic elastomers (TPEs) are a class of polymeric materials that exhibit rubber-like elasticity at room temperature but can melt and flow like plastics at high temperatures and be plasticized and molded.

[0003] During production, thermoplastic elastomer granule raw materials can be produced by physical blending. Premixing is an important step in physical blending, mainly used to mix base polymers (such as SEBS, SBS powder), processing oils (such as paraffin oil, naphthenic oil), polypropylene, polyethylene, and additives (such as antioxidants, ultraviolet absorbers), etc. Because the raw materials contain powder, granules and liquids, the premixing uniformity is easily poor, and the heating uniformity is also poor. Utility Model Content

[0004] Purpose of the utility model: The purpose of this utility model is to provide a premixing device for the production of thermoplastic elastomers, which not only has good premixing uniformity, but also good heating uniformity.

[0005] Technical solution: A premixing apparatus for the production of thermoplastic elastomers, comprising: A premixing tank with an inlet and an outlet; The mixing assembly includes a motor and a drive shaft. The stator of the motor is connected to the outside of the premixing tank, and the rotor of the motor passes through the premixing tank and is connected to the drive shaft. The drive shaft is sequentially connected to an upper propeller, a middle dispersing paddle, and a bottom scraper paddle. The suction surface of the upper propeller faces the inlet, the thrust surface of the upper propeller faces the middle dispersing paddle, and the bottom scraper paddle is close to the bottom and side wall inside the premixing tank. Heating components are distributed at the bottom and side walls outside the premixing tank, and also at the top inside the premixing tank.

[0006] Optionally, the upper propeller may be a two-bladed or three-bladed type.

[0007] Optionally, the central dispersing paddle includes: The dispersing paddle body is connected to the drive shaft; Several serrations are connected to the body of the dispersing paddle.

[0008] Optionally, the bottom scraper paddle includes: A connecting rod, one end of which is connected to the drive shaft; A bottom scraper and a side wall scraper are connected to each other. The bottom scraper is close to the bottom of the premix tank, and the side wall scraper is close to the side wall of the premix tank. The other end of the connecting rod is connected to the bottom scraper and / or the side wall scraper.

[0009] Optionally, the heating assembly includes: The first contact heating element is spirally wound around the side wall outside the premix tank; A second contact heating element is spirally wound around the bottom of the premix tank.

[0010] Optionally, the heating assembly may further include a radiant heating element connected to the top of the premix tank.

[0011] Optionally, it may also include several feet attached to the bottom of the premix tank.

[0012] Optionally, several of the support legs are evenly distributed circumferentially along the bottom outside the premix tank.

[0013] Beneficial effects: (1) The premixing device for thermoplastic elastomer production in this scheme has an upper propeller located near the liquid surface. Since the suction surface of the upper propeller faces the inlet and the thrust surface of the upper propeller faces the middle dispersing paddle, it is convenient to draw powder materials (such as SEBS and SBS powder) into the liquid material, thereby increasing the premixing uniformity and suppressing dust. The middle dispersing paddle is used to break up clumps and perform strong shearing and dispersion of powder materials, further increasing the premixing uniformity. The bottom scraper paddle is used to scrape off the adhering raw materials, prevent dead corners and scaling, and promote the circulation of the overall raw materials, further increasing the premixing uniformity. (2) The premixing device for thermoplastic elastomer production in this scheme has heating components on the bottom and side walls outside the premixing tank and the top inside the premixing tank, which facilitates the preheating of raw materials in the premixing tank from all directions (which can reduce the heating time of the subsequent twin-screw extruder), thus ensuring heating efficiency and heating uniformity. Furthermore, the heating uniformity is further ensured by the stirring components. Attached Figure Description

[0014] Figure 1 This is a front view of a premixing device for the production of thermoplastic elastomers according to Embodiment 1 of this utility model; Figure 2 This is a bottom view of a premixing device for the production of thermoplastic elastomers according to Embodiment 1 of this utility model; In the diagram: 1. Premix tank; 11. Inlet; 12. Outlet; 2. Stirring assembly; 21. Motor; 22. Drive shaft; 23. Upper propeller; 24. Middle dispersing paddle; 241. Dispersing paddle body; 242. Serrated edge; 25. Bottom scraper paddle; 251. Connecting rod; 252. Bottom scraper; 253. Side wall scraper; 3. Heating assembly; 31. First contact heating element; 32. Second contact heating element; 33. Radiant heating element; 4. Support leg. Detailed Implementation

[0015] To make the technical solution of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0016] The present application will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the relevant utility model and not intended to limit the utility model. Furthermore, it should be noted that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings. The terms "first," "second," etc., used in this utility model are provided for the convenience of describing the technical solution of this utility model and have no specific limiting effect; they are all general terms and do not constitute a limitation on the technical solution of this utility model. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Multiple technical solutions in the same embodiment, as well as multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not contradict or conflict, all of which are within the scope of protection claimed by this utility model.

[0017] Example 1 like Figures 1-2This embodiment provides a premixing device for the production of thermoplastic elastomers, including: a premixing tank 1 having an inlet 11 and an outlet 12; a stirring assembly 2 including a motor 21 and a drive shaft 22, the stator of the motor 21 being connected to the outside of the premixing tank 1, the rotor of the motor 21 passing through the premixing tank 1 and connected to the drive shaft 22, the drive shaft 22 being sequentially connected to an upper propeller 23, a middle dispersing paddle 24 and a bottom scraper paddle 25, the suction surface of the upper propeller 23 facing the inlet 11, the thrust surface of the upper propeller 23 facing the middle dispersing paddle 24, and the bottom scraper paddle 25 being close to the bottom and sidewalls inside the premixing tank 1; and a heating assembly 3, which is distributed on the bottom and sidewalls outside the premixing tank 1, and also distributed on the top inside the premixing tank 1.

[0018] Specifically, inlet 11 facilitates the entry of raw materials such as base polymers (e.g., SEBS, SBS powder), processing oils (e.g., paraffin oil, naphthenic oil), polypropylene, polyethylene, and additives (e.g., antioxidants, UV absorbers) into premix tank 1; outlet 12 facilitates the discharge of premixed raw materials; the rotor of motor 21 drives the drive shaft 22 to rotate, thereby driving the upper propeller 23, the middle dispersing propeller 24, and the bottom scraper propeller 25 to rotate; the upper propeller 23 is located near the liquid surface, and since the suction surface of the upper propeller 23 faces inlet 11 and the thrust surface of the upper propeller 23 faces the middle dispersing propeller 24, it facilitates the intake of powder materials (e.g., SEBS, SBS powder) into the liquid. The mixing process is as follows: the mixing tank 1 is filled with a mixture of raw materials, which increases the uniformity of premixing and suppresses dust. The middle dispersing paddle 24 is used to break up clumps and perform strong shearing and dispersion of powder, further increasing the uniformity of premixing. The bottom scraper paddle 25 is used to scrape off the adhering raw materials, prevent dead corners and scaling, and promote the circulation of the overall raw materials, further increasing the uniformity of premixing. Since the bottom and side walls outside the premixing tank 1, as well as the top inside the premixing tank 1, are equipped with heating components 3, it is convenient to preheat the raw materials in the premixing tank 1 from all directions (which can reduce the heating time of the subsequent twin-screw extruder), which can not only ensure heating efficiency, but also ensure heating uniformity. Under the action of the stirring component 2, the heating uniformity is further ensured.

[0019] Furthermore, such as Figure 1 The upper propeller 23 is either a two-bladed or a three-bladed type.

[0020] Specifically, the number of propeller blades is not limited and can be two, three, etc., depending on factors such as the capacity of premix tank 1.

[0021] Furthermore, such as Figure 1 The central dispersing paddle 24 includes: a dispersing paddle body 241 connected to the drive shaft 22; and several serrations 242 connected to the outside of the dispersing paddle body 241.

[0022] Specifically, the dispersing paddle body 241 is used to support a number of saw teeth 242, which are used to break up clumps and perform strong shearing and dispersion of powder materials. The shape of the dispersing paddle body 241 is preferably cylindrical, and in order to ensure the uniformity of dispersing, the saw teeth 242 are preferably evenly arranged along the circumference and axial direction outside the dispersing paddle body 241.

[0023] Furthermore, such as Figure 1 The bottom scraper paddle 25 includes: a connecting rod 251, one end of which is connected to the drive shaft 22; a bottom scraper 252 and a side wall scraper 253 connected to each other, the bottom scraper 252 being close to the bottom of the premix tank 1, the side wall scraper 253 being close to the side wall of the premix tank 1, and the other end of the connecting rod 251 being connected to the bottom scraper 252 and / or the side wall scraper 253.

[0024] Specifically, the bottom scraper 252 is used to scrape off the raw materials adhering to the bottom. The shape of the bottom scraper 252 is adapted to the shape of the bottom inside the premix tank 1, preferably an arc shape; the side wall scraper 253 is used to scrape off the raw materials adhering to the side wall; the connecting rod 251 is used to connect and ensure that the drive shaft 22 drives the bottom scraper 252 and the side wall scraper 253 to rotate.

[0025] Furthermore, such as Figures 1-2 The heating assembly 3 includes: a first contact heating element 31 spirally wound around the side wall outside the premix tank 1; and a second contact heating element 32 spirally wound around the bottom outside the premix tank 1.

[0026] Specifically, the first contact heating element 31 facilitates heating from the side wall outside the premix tank 1 inwards, and due to the spiral winding, it is easy to ensure good heating uniformity; the second contact heating element 32 facilitates heating from the bottom outside the premix tank 1 inwards, and due to the spiral winding, it is easy to ensure good heating uniformity; wherein, the first contact heating element 31 and the second contact heating element 32 are preferably of the form of resistance type.

[0027] Furthermore, such as Figure 1 The heating assembly 3 also includes a radiant heating element 33 connected to the top of the premix tank 1.

[0028] Specifically, the radiant heating element 33 facilitates heating from the top inside the premix tank 1, and the radiant heating element 33 is preferably of the infrared heating type.

[0029] Furthermore, such as Figure 1 It also includes several feet 4 connected to the bottom of the premix tank 1.

[0030] Specifically, several legs 4 are used to support the premix tank 1.

[0031] Furthermore, such as Figure 1 Several legs 4 are evenly distributed around the bottom of the premix tank 1.

[0032] Specifically, the circumferential distribution facilitates good support stability.

[0033] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A premixing apparatus for the production of thermoplastic elastomers, characterized in that, include: A premixing tank (1) having an inlet (11) and an outlet (12); The stirring assembly (2) includes a motor (21) and a drive shaft (22). The stator of the motor (21) is connected to the outside of the premix tank (1). The rotor of the motor (21) passes through the premix tank (1) and is connected to the drive shaft (22). The drive shaft (22) is connected in sequence to an upper propeller (23), a middle dispersing paddle (24), and a bottom scraper paddle (25). The suction surface of the upper propeller (23) faces the inlet (11), and the thrust surface of the upper propeller (23) faces the middle dispersing paddle (24). The bottom scraper paddle (25) is close to the bottom and side wall inside the premix tank (1). Heating components (3) are distributed on the bottom and side walls outside the premix tank (1), and also on the top inside the premix tank (1).

2. The premixing device for thermoplastic elastomer production according to claim 1, characterized in that, The upper propeller (23) is in the form of a two-bladed or three-bladed type.

3. A premixing device for the production of thermoplastic elastomers according to claim 1, characterized in that, The central dispersing paddle (24) includes: The dispersing paddle body (241) is connected to the drive shaft (22); Several serrations (242) are connected to the outside of the dispersing paddle body (241).

4. A premixing apparatus for the production of thermoplastic elastomers according to claim 1, characterized in that, The bottom scraper paddle (25) includes: A connecting rod (251), one end of which is connected to the drive shaft (22); A bottom scraper (252) and a side wall scraper (253) are connected to each other. The bottom scraper (252) is close to the bottom of the premix tank (1), and the side wall scraper (253) is close to the side wall of the premix tank (1). The other end of the connecting rod (251) is connected to the bottom scraper (252) and / or the side wall scraper (253).

5. A premixing apparatus for the production of thermoplastic elastomers according to any one of claims 1-4, characterized in that, The heating component (3) includes: The first contact heating element (31) is spirally wound around the side wall outside the premix tank (1); The second contact heating element (32) is spirally wound around the bottom of the premix tank (1).

6. A premixing apparatus for the production of thermoplastic elastomers according to claim 5, characterized in that, The heating assembly (3) also includes a radiant heating element (33) connected to the top of the premix tank (1).

7. A premixing apparatus for the production of thermoplastic elastomers according to any one of claims 1-4, characterized in that, It also includes several feet (4) attached to the bottom of the premix tank (1).

8. A premixing apparatus for the production of thermoplastic elastomers according to claim 7, characterized in that, Several of the aforementioned legs (4) are evenly distributed circumferentially along the bottom outside the premix tank (1).

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