Reinforced ptfe thin walled tubing and method of processing

Abstract

The application belongs to the technical field of PTFE thin-wall pipe, and particularly relates to a reinforced PTFE thin-wall pipe and a processing method thereof, which comprises the following components in parts by weight: fiber additive 10-25 parts; plasticizer 8-12 parts; antioxidant 1-1.8 parts; modified PTFE 180-220 parts; it can be concluded from three examples that the yield of the reinforced PTFE thin-wall pipe prepared by example two is higher.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of PTFE thin-wall pipe, and particularly relates to a reinforced PTFE thin-wall pipe and a processing method thereof. BACKGROUND

[0002] The PTFE thin-wall pipe is an extruded pipe produced by an extruder and the like, has excellent corrosion resistance due to the material of the raw material, and can stably transport gas and liquid in a low-temperature or high-temperature environment.

[0003] At present, the reinforced PTFE thin-wall pipe and the processing method thereof are often produced by cooperating different devices such as a heating mixing device, an extruder and a cooling device.

[0004] In use, when the extruder extrudes the PTFE raw material into a pipe type, the cooling device needs to cool it, and when the cooling device cools it, the PTFE thin-wall pipe is often located outside the cooling device, so that the cooling effect of the outer surface of the PTFE thin-wall pipe roughcast is different, therefore, the reinforced PTFE thin-wall pipe and the processing method thereof are provided for the above problems. SUMMARY

[0005] In order to make up for the deficiencies of the prior art, solve the problems that in use, when the extruder extrudes the PTFE raw material into a pipe type, the cooling device needs to cool it, and when the cooling device cools it, the PTFE thin-wall pipe is often located outside the cooling device, so that the cooling effect of the outer surface of the PTFE thin-wall pipe roughcast is different, therefore, the reinforced PTFE thin-wall pipe and the processing method thereof are provided.

[0006] The technical scheme adopted by the application to solve the technical problems is that the reinforced PTFE thin-wall pipe comprises the following components by weight:

[0007] 10-25 parts of fiber additive;

[0008] 8-12 parts of plasticizer;

[0009] 1-1.8 parts of antioxidant;

[0010] 180-220 parts of modified PTFE; it can be obtained through three embodiments that the yield of the reinforced PTFE thin-wall pipe prepared through the second embodiment is higher.

[0011] A processing method of the reinforced PTFE thin-wall pipe, the method is suitable for the reinforced PTFE thin-wall pipe, and the processing method comprises the following steps:

[0012] S1: After heating the PTFE raw material to 327℃, the PTFE is stirred during the heating process. During the stirring process, an extrusion aid needs to be added. The mixture of melted PTFE raw material and extrusion aid is stirred continuously for 12-15 minutes. After the mixture is completed, the mixed PTFE raw material is kept at 15℃-25℃ for more than 30 hours.

[0013] S2: Pour the mixed PTFE raw material into the extruder for extrusion to obtain a PTFE thin-walled tube blank; a cooling device is installed next to the extruder to cool it; the cooling device should be maintained at a temperature of 15℃ and 25℃;

[0014] S3: After the PTFE tube is dried by the dryer, it is sintered in a sintering furnace with a heating rate of 50℃ / h. After sintering, it is blown by the blower to obtain a reinforced PTFE thin-walled tube, which improves the stability of the PTFE thin-walled tube when working in different workplaces.

[0015] Preferably, the stirring device in S1 stirs the melted PTFE raw material and extrusion aid mixture at a speed of 1440 r / min;

[0016] During the inflation process, the blower in S3 limits the inflation of the PTFE thin-walled tube, and the inflation gas pressure is 1.3 MPa; this reduces the risk of damage to the PTFE raw material when it is squeezed by the molding machine after mixing; and it also reduces the risk of the PTFE thin-walled tube deforming outward.

[0017] Preferably, the mixing ratio of PTFE raw material to extrusion aid in S1 is 10:3, thereby improving the extensibility of the PTFE raw material itself.

[0018] Preferably, the cooling device in S2 includes a cooling box body; multiple sets of transmission rollers are rotatably connected to the inner wall of the cooling box body; guide holes are provided on both side walls of the cooling box body; a pair of sealing curved plates are fixed to the inner wall of the guide holes; multiple sets of first springs are fixed to the inner wall of the guide holes; the first springs are located inside the sealing curved plates; a push plate is fixed to the top of the pair of first springs; the top of the push plate is in contact with the top of the inner side of the sealing curved plate; multiple sets of first magnetic plates are fixed to both side walls of the multiple sets of sealing curved plates; multiple sets of second springs are fixed to the side wall of the pair of first magnetic plates that are close to each other; multiple sets of sealing flexible plates are fixed to the end of the pair of sealing curved plates that are close to each other; the outer walls of the multiple sets of sealing flexible plates are in contact with each other; thereby reducing the occurrence of coolant waste caused by the coolant inside the cooling box body being discharged to the outside through the gap between the pair of sealing curved plates.

[0019] Preferably, each of the multiple sets of push plates has an extension column fixedly connected to both sides of its sidewall; a second magnetic plate is fixedly connected to the inner sidewall of a pair of extension columns that are close to each other; a third magnetic plate is slidably connected to the inner side of the extension column; this improves the stability when the sealing curved plate and the outer sidewall of the PTFE thin-walled tube blank are in contact with each other.

[0020] Preferably, a pair of first magnetic flexible plates are fixedly connected to the inner wall of the feed hole; a pair of push plates are each fixedly connected to a second magnetic flexible plate on the side wall away from each other; this improves the stability when the sealing curved plate and the outer wall of the PTFE thin-walled tube blank are in contact with each other.

[0021] Preferably, a rotating column is rotatably connected to the inner side of the end of the third magnetic plate away from the second magnetic plate; this reduces the risk of severe wear caused by prolonged friction between the outer wall of the third magnetic plate and the inner wall of the guide hole.

[0022] The beneficial effects of this invention are:

[0023] 1. This invention provides a reinforced PTFE thin-walled tube and its processing method. Through three embodiments, it can be concluded that the reinforced PTFE thin-walled tube prepared by Embodiment 2 has a higher yield.

[0024] 2. This invention provides a reinforced PTFE thin-walled pipe and its processing method, which improves the mixing effect of PTFE raw material and extrusion aid, and reduces the damage to PTFE raw material when it is extruded by the molding machine. Attached Figure Description

[0025] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0026] Figure 1 This is a schematic diagram of the method flow in this invention;

[0027] Figure 2 This is a schematic diagram of the cooling box body structure in this invention;

[0028] Figure 3 This is a schematic diagram of the sealing curved plate structure in this invention;

[0029] Figure 4 for Figure 3 A schematic diagram of the structure at point A;

[0030] Figure 5 This is a schematic diagram of the third magnetic plate structure in this invention.

[0031] In the diagram: 1. Cooling box body; 11. Conveyor roller; 12. Guide hole; 13. Sealing curved plate; 14. First spring; 15. Push plate; 16. First magnetic plate; 17. Second spring; 18. Sealing flexible plate; 2. Extension column; 21. Second magnetic plate; 22. Third magnetic plate; 3. First magnetic flexible plate; 31. Second magnetic flexible plate; 4. Rotating column. Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Please see Figure 1 As shown, the reinforced PTFE thin-walled tube of the present invention comprises the following components in parts by weight: Example

[0034] 10 parts fiber additive; 8 parts plasticizer; 1 part antioxidant; 180 parts modified PTFE; the raw materials of this component are mixed to prepare the finished product, and then the yield of the finished product is tested. Example

[0035] 17 parts fiber additive; 10 parts plasticizer; 1.5 parts antioxidant; 200 parts modified PTFE; the raw materials of this component are mixed to prepare the finished product, and then the yield rate of the finished product is tested. Example

[0036] 25 parts fiber additive; 12 parts plasticizer; 1.8 parts antioxidant; 220 parts modified PTFE; the raw materials of this component are mixed to prepare the finished product, and then the yield of the finished product is tested.

[0037] Yield Residual amount of harmful substance Example 1 80% 2% Example 2 90% 1% Example 3 85% 2.3%

[0038] The three examples show that the reinforced PTFE thin-walled tube prepared in Example 2 has a higher yield.

[0039] A method for processing reinforced PTFE thin-walled tubes includes the following steps;

[0040] S1: After heating the PTFE raw material to 327℃, the PTFE is stirred during the heating process. During the stirring process, an extrusion aid needs to be added. The mixture of melted PTFE raw material and extrusion aid is stirred continuously for 12-15 minutes. After the mixture is completed, the mixed PTFE raw material is kept at 15℃-25℃ for more than 30 hours.

[0041] S2: Pour the mixed PTFE raw material into the extruder for extrusion to obtain a PTFE thin-walled tube blank; a cooling device is installed next to the extruder to cool it; the cooling device should be maintained at a temperature of 15℃ and 25℃;

[0042] S3: After the PTFE tube is dried by the dryer, it is sintered in a sintering furnace with a heating rate of 50℃ / h. After sintering, it is inflated by the blower to obtain a reinforced PTFE thin-walled tube. During operation, the overall process improves the thermal shrinkage of the PTFE thin-walled tube and enhances its stability in different workplaces.

[0043] Please see Figure 1 As shown, during the blowing process in S3, the blower limits the PTFE thin-walled tube being blown, and the blowing gas pressure is 1.3 MPa. This reduces the damage to the PTFE raw material when it is squeezed by the molding machine after mixing; it also reduces the outward deformation of the blown PTFE thin-walled tube. During operation, this improves the mixing effect of the PTFE raw material and the extrusion aid, and reduces the damage to the PTFE raw material when it is squeezed by the molding machine after mixing. By limiting the PTFE thin-walled tube being blown, the outward deformation of the blown PTFE thin-walled tube is reduced.

[0044] Please see Figure 1 As shown, the mixing ratio of PTFE raw material and extrusion aid in S1 is 10:3; during operation, by pouring a suitable extrusion aid into the PTFE raw material to be mixed, the extensibility of the PTFE raw material itself is improved.

[0045] Please see Figures 2-4As shown, the cooling device in S2 includes a cooling box body 1; multiple sets of transmission rollers 11 are rotatably connected to the inner wall of the cooling box body 1; guide holes 12 are provided on both side walls of the cooling box body 1; a pair of sealing curved plates 13 are fixedly connected to the inner wall of the guide holes 12; multiple sets of first springs 14 are fixedly connected to the inner wall of the guide holes 12; the first springs 14 are located inside the sealing curved plates 13; push plates 15 are fixedly connected to the top of the pair of first springs 14; the top of the push plates 15 is in contact with the top of the inner side of the sealing curved plates 13; multiple sets of first magnetic plates are fixedly connected to both side walls of the multiple sets of sealing curved plates 13. 16; A pair of first magnetic plates 16 are fixed to one side wall of each other with multiple sets of second springs 17; A pair of sealing curved plates 13 are fixed to one end of each other with multiple sets of sealing flexible plates 18; The outer walls of the multiple sets of sealing flexible plates 18 are in contact with each other; During operation, coolant is provided inside the cooling box body 1; The sealing curved plates 13, first springs 14, second springs 17 and sealing flexible plates 18 are all made of elastic material; The first magnetic plate 16 is made of magnetic material. When the PTFE thin-walled tube blank extruded by the extruder in S2 passes between the pair of sealing curved plates 13 and enters the inside of the cooling box body 1; The outer side of the PTFE thin-walled tube blank The wall presses against the sealing curved plate 13 and the push plate 15. Because the first spring 14 is made of elastic material, it pushes the sealing curved plate 13 to fit more closely with the outer wall of the PTFE thin-walled tube blank. During the process of the sealing curved plate 13 fitting with the outer wall of the PTFE thin-walled tube blank, multiple sets of sealing soft plates 18 are also fitted together with the sealing curved plate 13, thereby reducing the occurrence of coolant inside the cooling box body 1 being discharged to the outside through the inner side of the guide hole 12. The PTFE thin-walled tube blank enters the inner side of the cooling box body 1 through the space between the pair of sealing curved plates 13 and is completely immersed in coolant, thereby reducing the occurrence of coolant discharge from the inside of the cooling box body 1 through the guide hole 12. The PTFE thin-walled tube blank is located on the outside of the cooling box body 1, resulting in different cooling effects on the outer surface of the PTFE thin-walled tube blank. The overall device improves the cooling effect on the PTFE thin-walled tube blank. When the sealing curved plate 13 is no longer in use, the pair of first magnetic plates 16 are attracted to each other by magnetic force, and the second spring 17 is made of elastic material. The two cooperate with each other, so that the pair of sealing curved plates 13 drive the sealing soft plate 18 to stick together. This reduces the amount of coolant inside the cooling box body 1 that is discharged to the outside through the gap between the pair of sealing curved plates 13, thus reducing the waste of coolant.

[0046] Please see Figure 5As shown, multiple sets of push plates 15 have extension columns 2 fixedly connected to both sides of their side walls; a pair of extension columns 2 have a second magnetic plate 21 fixedly connected to one side of their inner side walls that are close to each other; a third magnetic plate 22 is slidably connected to the inner side of the extension column 2; during operation, the second magnetic plate 21 and the third magnetic plate 22 are both made of magnetic material. When the push plate 15 pushes the first spring 14 upward to fit against the outer side wall of the PTFE thin-walled tube blank, the second magnetic plate 21 and the third magnetic plate 22 repel each other due to magnetic force, so that the end of the third magnetic plate 22 away from the second magnetic plate 21 fits against the inner side wall of the guide hole 12, and the top of the third magnetic plate 22 fits against the top of the inner side of the sealing curved plate 13, thereby reducing the downward deformation of the top two ends of the sealing curved plate 13; the overall device improves the stability when the sealing curved plate 13 fits against the outer side wall of the PTFE thin-walled tube blank.

[0047] Please see Figure 4 As shown, a pair of first magnetic flexible plates 3 are fixedly connected to the inner wall of the feed hole 12; a pair of push plates 15 are each fixedly connected to a second magnetic flexible plate 31 on the side wall away from each other; during operation, the first magnetic flexible plate 3 and the second magnetic flexible plate 31 are both made of magnetic material, and the first magnetic flexible plate 3 and the second magnetic flexible plate 31 repel each other due to magnetic force, thereby pushing the push plate 15 to push the top of the inner side of the sealing curved plate 13; the overall device improves the stability when the sealing curved plate 13 and the outer wall of the PTFE thin-walled tube blank are in contact with each other.

[0048] Please see Figure 5 As shown, the inner side of the third magnetic plate 22 away from the second magnetic plate 21 is rotatably connected to a rotating column 4. During operation, when the rotating column 4 is in contact with the inner wall of the guide hole 12 along with the third magnetic plate 22, the rotating column 4 rotates itself, thereby reducing the friction between the outer wall of the third magnetic plate 22 and the inner wall of the guide hole 12 for a long time, which would otherwise lead to severe wear.

[0049] Working principle: During operation, the overall process improves the thermal shrinkage of the PTFE thin-walled tube and enhances its stability in different working environments; it also improves the mixing effect of PTFE raw material and extrusion aid, reducing the damage to the PTFE raw material when it is extruded by the molding machine; by limiting the expansion of the PTFE thin-walled tube, it reduces the outward deformation of the expanded PTFE thin-walled tube; by pouring a suitable extrusion aid into the PTFE raw material to be mixed, the extensibility of the PTFE raw material itself is improved; the cooling box body 1 is equipped with coolant; the sealing curved plate 13, the first spring 14, the second spring 17, and the sealing soft plate 18 are all made of elastic material; The first magnetic plate 16 is made of magnetic material. When the PTFE thin-walled tube blank extruded by the extruder in S2 enters the inner side of the cooling box body 1 through a pair of sealing curved plates 13, the outer wall of the PTFE thin-walled tube blank is squeezed against the sealing curved plate 13 and the push plate 15. Because the first spring 14 is made of elastic material, it pushes the sealing curved plate 13 to fit more closely with the outer wall of the PTFE thin-walled tube blank. During the process of the sealing curved plate 13 and the outer wall of the PTFE thin-walled tube blank fitting together, multiple sets of sealing soft plates 18 are also fitted together with the sealing curved plate 13, thereby reducing the occurrence of coolant inside the cooling box body 1 being discharged to the outside through the inner side of the guide hole 12. The PTFE thin-walled tube blank entering the cooling box body 1 through a pair of sealing plates 13... The inner side of body 1 is completely immersed in coolant, thereby reducing the situation where the cooling effect on the outer surface of the PTFE thin-walled tube blank varies due to the PTFE thin-walled tube blank being located on the outside of the cooling box body 1. The overall device improves the cooling effect on the PTFE thin-walled tube blank. When the sealing curved plate 13 is no longer in use, the pair of first magnetic plates 16 attract each other magnetically, and the second spring 17, being made of elastic material, works together to cause the pair of sealing curved plates 13 to drive the sealing soft plate 18 to stick together, thereby reducing the leakage of coolant from the inside of the cooling box body 1 through the gap between the pair of sealing curved plates 13, which would otherwise lead to coolant waste. The second magnetic plate 21 and the third magnetic plate 22 are both made of magnetic material. When the push plate 1 5. When the first spring 14 is pushed upward to fit against the outer wall of the PTFE thin-walled tube blank, the second magnetic plate 21 and the third magnetic plate 22 repel each other due to magnetic force. This causes the end of the third magnetic plate 22 away from the second magnetic plate 21 to fit against the inner wall of the guide hole 12, and the top of the third magnetic plate 22 to fit against the top of the inner side of the sealing curved plate 13. This reduces the downward deformation of the top two ends of the sealing curved plate 13. The overall device improves the stability when the sealing curved plate 13 fits against the outer wall of the PTFE thin-walled tube blank. The first magnetic soft plate 3 and the second magnetic soft plate 31 are both made of magnetic material. The first magnetic soft plate 3 and the second magnetic soft plate 31 repel each other due to magnetic force, thereby promoting the effect of the push plate 15 pushing the top of the inner side of the sealing curved plate 13.The overall device improves the stability when the sealing curved plate 13 and the outer wall of the PTFE thin-walled tube blank are in contact; when the rotating column 4 is in contact with the inner wall of the guide hole 12 along with the third magnetic plate 22, the rotating column 4 rotates itself, thereby reducing the situation where the outer wall of the third magnetic plate 22 is in contact with the inner wall of the guide hole 12 for a long time, which would lead to severe wear.

[0050] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A method for processing reinforced PTFE thin-walled tubes, characterized in that, The processing method includes: S1: After heating the PTFE raw material to 327℃, the PTFE is stirred during the heating process. During the stirring process, an extrusion aid needs to be added. The mixture of melted PTFE raw material and extrusion aid is stirred continuously for 12-15 minutes. After the mixture is completed, the mixed PTFE raw material is kept at 15℃-25℃ for more than 30 hours. S2: Pour the mixed PTFE raw material into the extruder for extrusion to obtain a PTFE thin-walled tube blank; a cooling device is installed next to the extruder to cool it; the cooling device should be maintained at a temperature of 15℃ and 25℃; S3: After the PTFE tube is dried by the dryer, it is sintered in a sintering furnace with a heating rate of 50℃ / h. After sintering, it is inflated by the blower to obtain a reinforced PTFE thin-walled tube. The stirring device in S1 stirs the melted PTFE raw material and extrusion aid mixture at a speed of 1440 r / min; During the inflation process, the inflation machine in S3 limits the inflation of the PTFE thin-walled tube, and the inflation gas pressure is 1.3 MPa. The mixing ratio of PTFE raw material to extrusion aid in S1 is 10:3; The cooling device in S2 includes a cooling box body (1); multiple sets of transmission rollers (11) are rotatably connected to the inner wall of the cooling box body (1); both sides of the cooling box body (1) are provided with guide holes (12); a pair of sealing curved plates (13) are fixedly connected to the inner wall of the guide holes (12); multiple sets of first springs (14) are fixedly connected to the inner wall of the guide holes (12); the first springs (14) are located inside the sealing curved plates (13); a pair of first springs (14) A push plate (15) is fixed to the top; the top of the push plate (15) is in contact with the top of the inner side of the sealing curved plate (13); multiple sets of first magnetic plates (16) are fixed to both sides of multiple sets of the sealing curved plates (13); multiple sets of second springs (17) are fixed to one side of a pair of first magnetic plates (16); multiple sets of sealing soft plates (18) are fixed to one end of a pair of sealing curved plates (13); the outer sides of multiple sets of sealing soft plates (18) are in contact with each other.

2. The method for processing reinforced PTFE thin-walled tubes according to claim 1, characterized in that: Multiple sets of push plates (15) are fixedly connected to two side walls with extension columns (2); a pair of extension columns (2) are fixedly connected to one side wall of their inner side walls with a second magnetic plate (21); and a third magnetic plate (22) is slidably connected to the inner side of the extension column (2).

3. The method for processing reinforced PTFE thin-walled tubes according to claim 2, characterized in that: A pair of first magnetic soft plates (3) are fixed to the inner wall of the feed hole (12); a pair of push plates (15) are each fixed to a second magnetic soft plate (31) on the side wall away from each other.

4. The method for processing reinforced PTFE thin-walled tubes according to claim 3, characterized in that: The third magnetic plate (22) is rotatably connected to a rotating column (4) on the inner side of the end away from the second magnetic plate (21).

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