Device and method for preparing bio-based thermoplastic elastomer for protective film

Abstract

The present invention discloses a device and method for preparing a bio-based thermoplastic elastomer for a protective film, comprising a bracket, a conveyor belt being provided in the bracket, a recycling box being provided at the end face of one starting point of the conveyor belt, a fiber adding box being provided above the starting point of the conveyor belt, the fiber adding box being a closed box body, a certain gap being formed between the side thereof away from the recycling box and the upper surface of the conveyor belt, a fiber feeding box being provided above the fiber adding box, and a fiber discharging nozzle being provided below the downward fiber adding box, a coating box being provided in a bracket outside the fiber adding box on a side away from the recycling box, the upper part of the center of the coating box being connected to the output end of an extruder, the input port of the extruder being connected to an elastomer feeding box, a cooling box being provided in a bracket on a side of the coating box away from the recycling box, a scraper being provided at the end of the conveyor belt, and a winding roller being provided outside the end of the conveyor belt.

Description

Technical Field

[0001] The present invention relates to the technical field of environmentally friendly material processing, in particular to a device and method for preparing a bio-based thermoplastic elastomer for a protective film. Background Art

[0002] As people's awareness of environmental protection increases, bio-based materials are widely studied and applied. Bio-based thermoplastic elastomers are one of the important materials. They have good processability, plasticity, biodegradability and renewability, and have been widely used in packaging, construction, automobiles, medical and other fields. However, bio-based thermoplastic elastomers still have some disadvantages as protective film materials, the most obvious of which are low strength and poor anti-slip properties. The low strength is mainly due to the weak physical properties of the bio-based materials themselves, while the poor anti-slip properties are due to the low surface friction coefficient of the bio-based materials, which makes them prone to slip. In the prior art, there are already some methods for improving the strength and anti-slip properties of bio-based thermoplastic elastomers. For example, the strength can be increased by adding fiber reinforcements or fillers. In addition, a coating can be applied to the surface to improve anti-slip properties. However, these methods require multiple processing steps, which increases production costs.

[0003] Therefore, it is necessary to provide a device and method for preparing a bio-based thermoplastic elastomer for a protective film to solve the problems raised in the above background technology. Summary of the Invention

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a device for preparing a bio-based thermoplastic elastomer for a protective film, comprising a bracket, a conveyor belt being provided in the bracket, a recycling box being provided at the end face of one end of the starting point of the conveyor belt, a fiber adding box being provided above the starting point of the conveyor belt, the fiber adding box being a closed box, a side thereof away from the recycling box having a certain gap with the upper surface of the conveyor belt, a fiber feeding box being provided above the fiber adding box, and a fiber discharging nozzle being provided below the downward fiber adding box, a coating box being provided in the bracket outside the fiber adding box on the side away from the recycling box, the top of the center of the coating box being connected to the output end of the extruder, the input port of the extruder being connected to the elastomer feeding box, a cooling box being provided in the bracket on the side of the coating box away from the recycling box, a scraper being provided at the end of the conveyor belt, and a winding roller being provided outside the end of the conveyor belt.

[0005] Furthermore, as a preference, a blower is provided in the fiber adding box on a side away from the recycling box, and the blower is connected to an air outlet nozzle, and the air outlet nozzle can evenly flow the air from the blower on the conveyor belt toward the recycling box.

[0006] Furthermore, preferably, the conveyor belt surface is distributed with staggered fine lines.

[0007] Furthermore, preferably, two symmetrical paint rollers are rotatably provided in the paint box, the cross-section of the paint roller is cam-shaped, there is a certain gap between the two paint rollers, and one side of the paint roller is always in contact with the paint box, and both ends of the two paint rollers are also in contact with the paint box.

[0008] Furthermore, preferably, both ends of the two paint rollers are provided with connecting shafts that penetrate the outer wall of the paint box, and gears are connected to the connecting shafts, and the two gears on the same side are meshed with each other, and one of the gears can be driven to rotate by a driving device.

[0009] Furthermore, preferably, one side of the scraper is rotatably connected to both sides of the bracket through a rotating shaft, a rotating rod is fixed at both ends of the rotating shaft, a spring is connected between the rotating rod and the bracket, and the spring provides elastic force to rotate the rotating rod upward.

[0010] Furthermore, preferably, there is a hollow interlayer in the scraper, and a slit penetrating the interlayer is opened on one side of the scraper close to the conveyor belt, the rotating shaft is a hollow tube body and is connected to the interlayer, and the rotating shaft is connected to the air pump.

[0011] Furthermore, preferably, a driving roller is provided between the winding roller and the scraper so as to be servo-rotatable, a lifting and lowering pressing roller is provided above the driving roller, and hydraulic cylinders are hinged at both ends of the pressing roller and the driving roller.

[0012] A method for using a bio-based thermoplastic elastomer preparation device for a protective film, comprising:

[0013] S1. Add transparent glass fiber into the fiber feed box and evenly distribute the fiber onto the conveyor belt through the fiber discharge nozzle;

[0014] S2. Use a blower to evenly distribute air on the conveyor belt toward the recycling bin, so that the fibers are distributed along the fine lines, and fibers that have a poor fit with the conveyor belt are blown into the recycling bin;

[0015] S3, putting the bio-based thermoplastic elastomer raw material pellets into the elastomer feed box, heating and melting them through the extruder and extruding them into the coating box;

[0016] S4. The elastomer fluid passing between the two coating rollers is evenly coated on the conveyor belt to form a thin film that covers and fuses the fibers on the conveyor belt;

[0017] S5, cooling the film on the conveyor belt through a cooling box to solidify the film into shape;

[0018] S6, scraping the film at the end of the conveyor belt with a scraper to separate the film from the conveyor belt;

[0019] S7, the film passes between the pressing roller and the active roller, and is further stretched and thinned under the extrusion of the two rollers, making the film smoother and improving the fit between the film and the fiber during extrusion;

[0020] S8, winding the film into a winding roller.

[0021] Also includes

[0022] S2-1. The direction of the fine lines distributed on the surface of the conveyor belt tends to be perpendicular to the direction of travel of the conveyor belt, so that the distribution trend of the fibers on the conveyor belt is also the same, so that the fibers at the bottom of the produced film can be distributed in a relatively direction, and then the friction between the film and the object it is in contact with can be directionally increased.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] By covering the conveyor belt with fibers to form a thin film, the strength of the film and the friction at the bottom can be enhanced, making the film more firm and stable during use. By evenly dispersing the fibers and controlling their distribution position, as well as designing fine lines, the quality of the product can be controlled, making the produced film superior in quality and having better use effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The figure is a schematic structural diagram of a device for preparing a bio-based thermoplastic elastomer for a protective film;

[0026] Figure 2 Schematic diagram of the structure inside the fiber adding box;

[0027] Figure 3 Schematic diagram of the internal structure of the paint box;

[0028] Figure 4 Schematic diagram of the structure of the scraper;

[0029] Figure 5 It is a structural diagram of the active roller and the pressing roller;

[0030] In the figure: 1. Bracket; 2. Conveyor belt; 3. Recovery box; 41. Fiber adding box; 42. Fiber feeding box; 43. Fiber discharging nozzle; 44. Blower; 45. Air outlet nozzle; 46. Material leveling plate; 51. Elastomer feeding box; 52. Extruder; 53. Coating box; 54. Driving device; 55. Coating roller; 56. Gear; 61. Cooling box; 62. Cooling fan; 71. Scraper; 72. Rotating rod; 73. Rotating shaft; 74. Spring; 81. Winding roller; 82. Active roller; 83. Pressing roller; 84. Hydraulic cylinder. DETAILED DESCRIPTION

[0031] See also Figure 1 In an embodiment of the present invention, a device for preparing a bio-based thermoplastic elastomer for a protective film includes a bracket 1, wherein the bracket 1 is provided with a conveyor belt 2, and a recycling box 3 is provided on the end face of one end of the starting point of the conveyor belt 2, and a fiber adding box 41 is provided above the starting point of the conveyor belt 2. The fiber adding box 41 is a closed box, and a certain gap is formed between the side away from the recycling box 3 and the upper surface of the conveyor belt 2. A fiber feeding box 42 is provided above the fiber adding box 41, and a fiber discharging nozzle 43 is provided below the downward fiber adding box 41. A coating box 53 is set in the bracket 1 on the side away from the recycling box 3 outside the fiber adding box 41, and the upper center of the coating box 53 is connected to the output end of the extruder 52, and the input port of the extruder 52 is connected to the elastomer feeding box 51. A cooling box 61 is set in the bracket 1 on the side of the coating box 53 away from the recycling box 3. A scraper 71 is provided at the end of the conveyor belt 2, and a winding roller 81 is provided outside the end of the conveyor belt 2. Elastomer raw material pellets are fed from an elastomer feed box 51 into an extruder 52, where they are heated and melted before being extruded into a coating box 53. The melted elastomer fluid is applied to the conveyor belt 2 to form a thin film, covering the fibers falling from the fiber discharge nozzle 43, thereby increasing the strength of the film and the friction at the bottom of the film.

[0032] A plurality of cooling fans 62 are distributed on top of the cooling box 61 along the direction of travel of the conveyor belt 2. The wind force of the cooling fans 62 increases gradually along the direction of travel of the conveyor belt 2, thereby improving the cooling efficiency of the film on the conveyor belt 2 and preventing the strong wind from affecting the uniformity of the film when it is highly fluid.

[0033] See also Figure 2 In this embodiment, a plurality of circumferentially distributed screed plates 46 are rotatably provided in the fiber discharge nozzle 43. By rotating the screed plates 46, the fibers in the fiber feed box 42 can be evenly dispersed into the fiber discharge nozzle 43 and dropped onto the conveyor belt 2.

[0034] In this embodiment, a blower 44 is provided in the fiber addition box 41 on a side away from the recovery box 3. The blower 44 is connected to an air outlet 45, which evenly distributes the air from the blower 44 along the conveyor belt 2 toward the recovery box 3. In other words, the fibers dropped from the fiber discharge nozzle 43 onto the conveyor belt 2 are evenly spread on the conveyor belt 2 by the air from the blower 44, while fibers that are less closely attached to the conveyor belt 2 are blown off into the recovery box 3.

[0035] In this embodiment, the surface of the conveyor belt 2 is distributed with interlaced fine grooves. The fine grooves on the conveyor belt 2 can increase the friction between the fibers and the conveyor belt 2, allowing the fibers to be distributed along the positions of the fine grooves. This can further control the distribution position of the fibers and allow them to interlace, thereby increasing the strength of the film formed on the surface of the conveyor belt 2 in the next step.

[0036] When the direction of the fine lines distributed on the surface of the conveyor belt 2 tends to be perpendicular to the direction of travel of the conveyor belt 2, the distribution trend of the fibers on the conveyor belt 2 is also the same, so that the fibers at the bottom of the produced film can be distributed in a relatively direction, thereby directionally increasing the friction between the film and the object it is attached to.

[0037] Directional increase in the friction of the film makes it possible to directionally improve the film's anti-slip properties, making the film suitable as a protective film for the surface of objects subjected to directional forces. For example, improving the lateral anti-slip properties of the protective film fitted in the sliding door can prevent the protective film from shifting during frequent movement of the sliding door.

[0038] See also Figure 3 Two symmetrical coating rollers 55 are rotatably mounted within the coating box 53. The coating rollers 55 have a cam-shaped cross-section, with a certain gap between them. One side of the coating rollers 55 is always in contact with the coating box 53, and both ends of the coating rollers 55 are also in contact with the coating box 53. In other words, the elastomeric fluid is extruded from between the two coating rollers 55 into a thin film that evenly covers the conveyor belt 2.

[0039] In this embodiment, each of the two coating rollers 55 is provided with a connecting shaft extending through the outer wall of the coating chamber 53. A gear 56 is connected to the connecting shaft. The two gears 56 on the same side mesh with each other, and one of the gears 56 can be driven to rotate by the drive device 54. In other words, the drive device 54 can drive the two coating rollers 55 to rotate in opposite directions, maintaining symmetry. Furthermore, because the cross-section of the coating rollers 55 is cam-shaped, the gap between the coating rollers 55 can be adjusted, thereby adjusting the thickness of the sheet of fluid extruded between the two coating rollers 55.

[0040] In this embodiment, a heating wire is provided inside the coating roller 55 to keep the coating roller 55 at a certain temperature, thereby maintaining the fluidity of the elastic fluid passing therethrough and preventing the elastic material from sticking.

[0041] See also Figure 4In this embodiment, one side of the scraper 71 is rotatably connected to both sides of the bracket 1 via a rotating shaft 73. A rotating rod 72 is fixed to each end of the rotating shaft 73. A spring 74 is connected between the rotating rod 72 and the bracket 1, and the spring 74 provides the elastic force that causes the rotating rod 72 to rotate upward. In other words, under the action of the spring 74, the scraper 71 maintains contact with the surface of the conveyor belt 2, and the contact point is located at the starting point of the downward rotation of the end of the conveyor belt 2. Under the action of the scraper 71, the film on the surface of the conveyor belt 2 is separated from the conveyor belt 2 and reeled onto the reel 81.

[0042] In this embodiment, the scraper 71 has a hollow interlayer within it, and a slit extending through the interlayer is formed on one side of the scraper 71 near the conveyor belt 2. The rotating shaft 73 is a hollow tube that communicates with the interlayer and is connected to an air pump. In other words, the air pump enables the scraper 71 to blow a high-pressure airflow toward the bottom of the film in the conveyor belt 2, thereby smoothly separating the film from the conveyor belt 2. In this embodiment, the conveyor belt 2 is coated with polytetrafluoroethylene, which improves the surface smoothness and hardness of the conveyor belt 2 and ensures smooth separation of the film from the conveyor belt 2.

[0043] See also Figure 5 In this embodiment, a servo-rotatable active roller 82 is provided between the winding roller 81 and the scraper 71. A liftable pressing roller 83 is provided above the active roller 82. Hydraulic cylinders 84 are hingedly connected to the pressing roller 83 and the active roller 82 at both ends. In other words, the hydraulic cylinders 84 can adjust the distance between the pressing roller 83 and the active roller 82. The distance between the pressing roller 83 and the active roller 82 is smaller than the thickness of the film on the conveyor belt 2. As the film passes between the pressing roller 83 and the active roller 82, it is squeezed between the two rollers, further stretching and thinning the film, making it smoother and improving the adhesion between the film and the fibers during squeezing.

[0044] A method for using a bio-based thermoplastic elastomer preparation device for a protective film, comprising:

[0045] S1. Add transparent glass fibers into the fiber feed box 42 and evenly distribute the fibers onto the conveyor belt 2 through the fiber discharge nozzle 43;

[0046] S2. Use a blower to evenly blow air on the conveyor belt 2 toward the recycling box 3, so that the fibers can be distributed along the fine lines, and the fibers with poor adhesion to the conveyor belt 2 are blown into the recycling box 3;

[0047] S3, putting the bio-based thermoplastic elastomer raw material particles into the elastomer feed box 51, heating and melting them through the extruder and extruding them into the coating box 53;

[0048] S4, the elastomer fluid passing between the two coating rollers 55 is evenly coated on the conveyor belt 2 to form a thin film that covers and fuses the fibers on the conveyor belt 2;

[0049] S5, cooling the film on the conveyor belt 2 through the cooling box 61 to solidify the film;

[0050] S6, scraping the film at the end of the conveyor belt 2 by the scraper 71 to separate the film from the conveyor belt 2;

[0051] S7, the film passes between the pressing roller 83 and the driving roller 82, and is further stretched and thinned under the extrusion of the two rollers, making the film smoother and improving the adhesion between the film and the fiber during the extrusion;

[0052] S8, winding the film into the winding roller 81.

[0053] Also includes,

[0054] S2-1. The direction of the fine lines distributed on the surface of the conveyor belt 2 tends to be perpendicular to the direction of travel of the conveyor belt 2, so that the distribution trend of the fibers on the conveyor belt 2 is also the same, so that the fibers at the bottom of the produced film can be distributed in a relatively direction, and then the friction between the film and the object it is in contact with can be directionally increased.

[0055] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A device for preparing a bio-based thermoplastic elastomer for a protective film, comprising a bracket (1), characterized in that: A conveyor belt (2) is provided in the bracket (1), a recycling box (3) is provided on the end face of one end of the starting point of the conveyor belt (2), a fiber adding box (41) is provided above the starting point of the conveyor belt (2), the fiber adding box (41) is a closed box, and a certain gap is formed between the side away from the recycling box (3) and the upper surface of the conveyor belt (2), a fiber feeding box (42) is provided above the fiber adding box (41), and a fiber discharging nozzle (43) is provided below the fiber adding box (41), and the fiber adding box ( A coating box (53) is mounted on a bracket (1) on the side away from the recycling box (3) outside the conveyor belt (41), the upper center of the coating box (53) is connected to the output end of the extruder (52), the input port of the extruder (52) is connected to the elastomer feed box (51), a cooling box (61) is mounted on the bracket (1) on the side away from the recycling box (3), a scraper (71) is provided at the end of the conveyor belt (2), and a winding roller (81) is provided outside the end of the conveyor belt (2); A blower (44) is provided in the fiber adding box (41) on a side away from the recovery box (3), and the blower (44) is connected to an air outlet (45), and the air outlet (45) can evenly flow the air from the blower (44) on the conveyor belt (2) toward the recovery box (3); The surface of the conveyor belt (2) is distributed with staggered fine lines; Two symmetrical coating rollers (55) are rotatably provided in the coating box (53). The cross section of the coating rollers (55) is cam-shaped. There is a certain gap between the two coating rollers (55). One side of the coating rollers (55) is always in contact with the coating box (53). Both ends of the two coating rollers (55) are also in contact with the coating box (53). An active roller (82) is servo-rotatably provided between the winding roller (81) and the scraper (71), a lifting and lowering pressing roller (83) is provided above the active roller (82), and hydraulic cylinders (84) are hinged at both ends of the pressing roller (83) and the active roller (82).

2. The device for preparing a bio-based thermoplastic elastomer for a protective film according to claim 1, characterized in that: Both ends of the two coating rollers (55) are provided with connecting shafts penetrating the outer wall of the coating box (53), and a gear (56) is connected to the connecting shaft. The two gears (56) on the same side are meshed with each other, and one of the gears (56) can be driven to rotate by the driving device (54).

3. The device for preparing a bio-based thermoplastic elastomer for a protective film according to claim 1, characterized in that: One side of the scraper (71) is rotatably connected to both sides of the bracket (1) via a rotating shaft (73). Rotating rods (72) are fixed at both ends of the rotating shaft (73). A spring (74) is connected between the rotating rod (72) and the bracket (1). The spring (74) provides elastic force to rotate the rotating rod (72) upward.

4. The device for preparing a bio-based thermoplastic elastomer for a protective film according to claim 3, characterized in that: The scraper (71) has a hollow interlayer inside, and a slit that penetrates the interlayer is opened on one side of the scraper (71) close to the conveyor belt (2). The rotating shaft (73) is a hollow tube body and is connected to the interlayer. The rotating shaft (73) is connected to the air pump.

5. The method for using the device for preparing a bio-based thermoplastic elastomer for a protective film according to any one of claims 1 to 4, characterized in that: The steps include: S1. Add transparent glass fibers into the fiber feed box (42) and evenly distribute the fibers onto the conveyor belt (2) through the fiber discharge nozzle (43); S2, using a blower to evenly flow air on the conveyor belt (2) toward the recycling box (3), so that the fibers can be distributed along the positions of the fine lines, and the fibers that have a poor fit with the conveyor belt (2) are blown into the recycling box (3); S3, putting bio-based thermoplastic elastomer raw material particles into the elastomer feed box (51), heating and melting them through an extruder and extruding them into the coating box (53); S4, the elastomer fluid passing between the two coating rollers (55) is evenly coated on the conveyor belt (2), forming a thin film that covers and fuses the fibers on the conveyor belt (2); S5, cooling the film on the conveyor belt (2) through a cooling box (61) to solidify the film; S6, scraping the film at the end of the conveyor belt (2) by a scraper (71) to separate the film from the conveyor belt (2); S7, the film passes between the pressing roller (83) and the driving roller (82), and is further stretched and thinned under the extrusion of the two rollers, making the film smoother and improving the fit between the film and the fiber during the extrusion; S8, winding the film into the winding roller (81).

6. The method for using the device for preparing a bio-based thermoplastic elastomer for a protective film according to claim 5, characterized in that: The step 2 further comprises: S2-1. The direction of the fine lines distributed on the surface of the conveyor belt (2) tends to be perpendicular to the direction of travel of the conveyor belt (2), so that the distribution trend of the fibers on the conveyor belt (2) is also the same, so that the fibers at the bottom of the produced film can be distributed in a relatively directional manner, thereby directionally increasing the friction between the film and the object it is in contact with.

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