High-temperature resistant gas pipe for welding machine and preparation method thereof

Abstract

The present invention provides a high-temperature resistant air pipe for a welding machine and a preparation method thereof, relating to the technical field of welding air pipes. The air pipe comprises an outer rubber sleeve, a skeleton layer and a polytetrafluoroethylene inner pipe, wherein the skeleton layer is adhered to the inner side of the outer rubber sleeve, the polytetrafluoroethylene inner pipe is arranged on the inner side of the skeleton layer, the outer side of the polytetrafluoroethylene inner pipe is provided with protrusions, and the protrusions are provided in multiple groups, and fiber filaments are interspersed on the protrusions; the skeleton layer is made by melting PE100-grade raw materials and PU raw materials and mixing them with glass fiber and carbon fiber; the present invention adopts PE100-grade raw materials and PU raw materials and mixing them with glass fiber and carbon fiber to make the skeleton layer, which is coated on the outer side of the polytetrafluoroethylene inner pipe, can effectively tighten the polytetrafluoroethylene inner pipe to prevent it from expanding due to heat, and cooperates with the fiber filaments to connect the protrusions and the skeleton layer, which can achieve the purpose of outward stretching and limiting the inner polytetrafluoroethylene inner pipe, thereby preventing it from shrinking due to cold and preventing it from loosening and falling off.

Description

Technical Field

[0001] The present invention relates to the technical field of welding gas pipes, in particular to a high-temperature resistant gas pipe for a welding machine and a preparation method thereof. Background Art

[0002] The welding machine uses the high-temperature arc generated when the positive and negative poles are momentarily short-circuited to melt the solder on the welding rod and the material to be welded, so that the contacted objects are combined. Its structure is very simple, which is a high-power transformer. Electric welding machines can generally be divided into two types according to the type of output power: one is AC power supply and the other is DC power. They use the principle of inductance. The inductance will produce a huge voltage change when it is connected and disconnected. The high-voltage arc generated when the positive and negative poles are momentarily short-circuited is used to melt the solder on the welding rod to achieve the purpose of atomic combination. When using the welding machine, a gas pipe is usually required to transport carbon dioxide gas.

[0003] At present, PP tubes are generally used as air pipes for welding machines. During use, due to the high temperature inside the welding machine, the air pipe is affected by thermal expansion and contraction in a high-temperature environment, which may become loose and cause the air pipe to fall off. As a result, the vacuum air pipe of the welding machine leaks after falling off, causing the machine to stop and affecting production capacity. Therefore, the present invention proposes a high-temperature resistant air pipe for a welding machine and a preparation method thereof to solve the problems existing in the prior art. Summary of the Invention

[0004] In view of the above problems, the present invention provides a high-temperature resistant gas pipe for a welding machine and a preparation method thereof, wherein the high-temperature resistant gas pipe for a welding machine can effectively prevent the occurrence of loosening and falling off.

[0005] To achieve the purpose of the present invention, the present invention is implemented through the following technical solutions: a high-temperature resistant gas pipe for a welding machine, comprising an outer rubber sleeve, a skeleton layer and a polytetrafluoroethylene inner tube, wherein the skeleton layer is adhered to the inner side of the outer rubber sleeve, the polytetrafluoroethylene inner tube is arranged on the inner side of the skeleton layer, and the outer side of the polytetrafluoroethylene inner tube is provided with protrusions, and the protrusions are provided in multiple groups, and fiber filaments are interspersed on the protrusions;

[0006] The skeleton layer is made of PE100 grade raw materials, PU raw materials melted and mixed with glass fiber and carbon fiber. The fiber filaments are inserted into the interior of the skeleton layer. The gap between the skeleton layer and the polytetrafluoroethylene inner tube is filled with halogen-free viscose.

[0007] A further improvement is that the protrusion is made of polytetrafluoroethylene material and is integrally formed with the polytetrafluoroethylene inner tube by hot melting.

[0008] A further improvement is that the outer rubber sleeve is prepared from styrene-butadiene rubber, nitrile rubber, dioctyl phthalate, sulfur, diphenylguanidine, zinc oxide, carbon black, paraffin oil, barium sulfate, stearic acid and an antioxidant.

[0009] A method for preparing a high-temperature resistant gas pipe for a welding machine comprises the following steps:

[0010] S1: adding styrene-butadiene rubber and nitrile-butadiene rubber into a mixer to prepare a rubber mixture slurry, adding dioctyl phthalate, zinc oxide, and carbon black, mixing and stirring to prepare a mixed ingredient, and then sequentially adding the mixed ingredient, an antioxidant, and stearic acid into the mixer for refining;

[0011] S2: sulfur, diphenylguanidine, paraffin oil, and barium sulfate are added to a mixer for refining to obtain a rubber base material, which is then introduced into a rolling press for compression molding. The rubber base material is then placed into a rubber tube forming mold in a hose vulcanizing tank for vulcanization and tube forming. Finally, the outer rubber sleeve is obtained after cooling to room temperature.

[0012] S3: Mix the polytetrafluoroethylene and the cleaning agent evenly and put them into the die of the cold extruder. Press the die tightly and heat up to extrude the sleeve. Then vertically put it into a preheated sintering furnace for baking. After cooling, the polytetrafluoroethylene inner tube is obtained.

[0013] S4: Melting PE100 grade raw materials and PU raw materials to obtain a base material, cross-arranging multiple glass fibers and carbon fibers, and mixing them evenly to make reinforcing fibers, adding them to the base material, mixing them using a mixer, and then putting them into an extruder to extrude into a tube to obtain a skeleton layer;

[0014] S5: preparing protrusions by extruding polytetrafluoroethylene, hot-melting the protrusions to the outside of the polytetrafluoroethylene inner tube, coating the outside of the polytetrafluoroethylene inner tube with halogen-free adhesive, sheathing the skeleton layer on the outside of the polytetrafluoroethylene inner tube, and inserting fiber filaments between the skeleton layer and the protrusions;

[0015] S6: coating the outer side of the skeleton layer with adhesive, and sleeve the outer rubber sleeve on the outer side of the skeleton layer to obtain a finished product.

[0016] A further improvement is that in S1 and S2, the outer rubber sleeve includes the following components in a mass ratio: 30-60 parts of styrene-butadiene rubber, 30-70 parts of nitrile rubber, 3-5 parts of di-n-octyl phthalate, 2-3 parts of sulfur, 1-2 parts of diphenylguanidine, 5-6 parts of zinc oxide, 50-60 parts of carbon black, 3-8 parts of paraffin oil, 10-15 parts of barium sulfate, 2-3 parts of stearic acid and 1-2 parts of antioxidant.

[0017] Further improvements are: in S1 and S2, the pressure in the mixer is controlled to 80-90 kPa, the temperature in the mixer is controlled to 105-115 degrees Celsius, the refining is 10-12 minutes after each addition of material, the temperature in the rolling press is 60-80°C, the temperature in the hose vulcanization tank is 160-170°C, and the pressure in the hose vulcanization tank is controlled to 5-6 MPa for vulcanization pipe making.

[0018] A further improvement is that in S3, the mass ratio of polytetrafluoroethylene to the cleaning agent is controlled to be 3:1, and in S3, the pressed film is heated to 190-240°C and then a sleeve is extruded, and the extruded sleeve is vertically placed in a sintering furnace preheated to 900-1000°C and baked for 0.5-1.5 minutes.

[0019] A further improvement is that in S4, the skeleton layer includes the following components in a mass ratio: 100-130 parts of PE100 grade raw material, 50-70 parts of PU raw material, 10-15 parts of glass fiber, and 10-15 parts of carbon fiber.

[0020] A further improvement is that in S4, the PE100 grade raw material and the PU raw material are melted at a melting temperature of 180-190°C for 10-15 minutes, a flame retardant is added thereto after melting, and the mixture is stirred and mixed at a stirring speed of 50-80 r / min to obtain a base material.

[0021] A further improvement is that in S4, the reinforcing fibers are added to the base material, mixed evenly, and then homogenized and dispersed by ultrasound for 5-8 minutes, with the ultrasonic pressure controlled at 1.15-1.18 MPa, before being added to the extruder.

[0022] The beneficial effects of the present invention are:

[0023] 1. The present invention adopts PE100 grade raw materials and PU raw materials, which are melted and mixed with glass fiber and carbon fiber to make a skeleton layer, which is coated on the outside of the polytetrafluoroethylene inner tube. It can effectively tighten the polytetrafluoroethylene inner tube to prevent it from expanding due to heat. The fiber filaments connect the protrusions and the skeleton layer, which can stretch the polytetrafluoroethylene inner tube outward to prevent it from shrinking due to cold and prevent it from loosening and falling off.

[0024] 2. The present invention adopts polytetrafluoroethylene material as the inner tube, which has the characteristics of corrosion resistance, acid and alkali resistance, high temperature resistance, high lubrication, and non-adhesion. It is physiologically inert and non-toxic to the human body. The electrical insulation can withstand a voltage of 1500V, and has a low friction coefficient, is not easy to adhere, and is more durable.

[0025] 3. The present invention mixes nitrile rubber and styrene butadiene rubber and uses them together, taking into account the performance of the two, effectively improving wear resistance, and having high mechanical properties, high mechanical properties and swelling resistance. Paraffin oil is used to improve the tensile strength of the rubber, making it more tear-resistant and wear-resistant. In addition, carbon black, barium sulfate and sulfur are added to improve its acid resistance, making it less prone to local breakage, and greatly improving the overall physical properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is the front view of the present invention;

[0027] Figure 2It is a preparation flow chart of the present invention.

[0028] Including: 1. Outer rubber casing; 2. Skeleton layer; 3. Polytetrafluoroethylene inner tube; 4. Protrusion; 5. Fiber filament; 6. Halogen-free viscose. DETAILED DESCRIPTION

[0029] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the examples. The examples are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0030] Example 1

[0031] according to Figure 1 As shown, this embodiment provides a high-temperature resistant gas pipe for a welding machine, comprising an outer rubber sleeve 1, a skeleton layer 2, and a polytetrafluoroethylene inner tube 3. The skeleton layer 2 is adhered to the inner side of the outer rubber sleeve 1, and the polytetrafluoroethylene inner tube 3 is arranged on the inner side of the skeleton layer 2. The outer side of the polytetrafluoroethylene inner tube 3 is provided with protrusions 4, and the protrusions 4 are provided in multiple groups. Fiber filaments 5 are inserted into the protrusions 4; the fiber filaments 5 are metal wires.

[0032] The skeleton layer 2 is made of PE100-grade raw materials and PU raw materials, which are melted and mixed with glass fiber and carbon fiber. The fiber filaments 5 are inserted into the interior of the skeleton layer 2. The gap between the skeleton layer 2 and the polytetrafluoroethylene inner tube 3 is filled with halogen-free viscose 6. Teflon tubes have a high degree of chemical stability: they can withstand all strong acids, including aqua regia, hydrofluoric acid, concentrated hydrochloric acid, nitric acid, fuming sulfuric acid, organic acids, strong bases, strong oxidants, reducing agents, and various organic solvents. They are very suitable for feeding high-purity chemicals. Low friction coefficient: The friction coefficient is generally only 0.04, making it an excellent self-lubricating material, and the friction coefficient does not change with changes in temperature. It has excellent anti-stick properties, and colloids and chemicals are not easily adhered to the inner wall of the tube. Excellent aging resistance, can be used outdoors for a long time. Excellent electrical insulation properties: PTFE is a highly non-stick material with good dielectric properties, high electrical resistance, and a dielectric constant of approximately 2.0, which is the lowest among all electrical insulation materials.

[0033] The protrusions 4 are made of polytetrafluoroethylene (PTFE) and are integrally formed with the PTFE inner tube 3 by hot-melt molding. A skeleton layer is formed by melting PE100-grade and PU materials, mixed with glass fiber and carbon fiber. This skeleton layer is wrapped around the outer surface of the PTFE inner tube, effectively tightening the PTFE inner tube and preventing it from expanding due to heat. The fiber filaments connecting the protrusions and the skeleton layer act as an outward stretching limiter for the inner PTFE inner tube, preventing it from contracting due to cold and preventing it from loosening or falling off.

[0034] The outer rubber sleeve 1 is made of styrene-butadiene rubber, nitrile-butadiene rubber, di-n-octyl phthalate, sulfur, diphenylguanidine, zinc oxide, carbon black, paraffin oil, barium sulfate, stearic acid, and an antioxidant. The nitrile-butadiene rubber and styrene-butadiene rubber are mixed and used together to take into account the performance of both, effectively improve wear resistance, and have high mechanical properties, high mechanical properties, and swelling resistance. The paraffin oil is used to improve the tensile strength of the rubber, making it more tear-resistant and wear-resistant. The addition of carbon black, barium sulfate, and sulfur improves its acid resistance, making it less prone to local breakage and greatly improving the overall physical properties.

[0035] Example 2

[0036] according to Figure 2 As shown, this embodiment provides a method for preparing a high-temperature resistant gas pipe for a welding machine, comprising the following steps:

[0037] Prepare the following ingredients in mass ratio: 30 parts of styrene-butadiene rubber, 30 parts of nitrile rubber, 3 parts of dioctyl phthalate, 2 parts of sulfur, 1 part of diphenylguanidine, 5 parts of zinc oxide, 50 parts of carbon black, 3 parts of paraffin oil, 10 parts of barium sulfate, 2 parts of stearic acid and 1 part of antioxidant;

[0038] Styrene-butadiene rubber and nitrile rubber are added to a mixer to be refined into a rubber mixture slurry, dioctyl phthalate, zinc oxide, and carbon black are added and mixed and stirred to form a mixed ingredient, and then the mixed ingredient, antioxidant, and stearic acid are added to the mixer in sequence for refining;

[0039] Sulfur, diphenylguanidine, paraffin oil, and barium sulfate are added to a mixer for refining to obtain a rubber base material. During the above process, the pressure in the mixer is controlled at 80-90 kPa, and the temperature in the mixer is controlled at 105-115 degrees Celsius. After each addition, the rubber base material is refined for 10-12 minutes. The rubber base material is then introduced into a rolling press for compression molding, and then placed in a rubber tube forming mold in a hose vulcanizing tank for vulcanization and tube processing. Finally, the outer rubber sleeve 1 is obtained after cooling to room temperature. The temperature in the rolling press is 60-80°C, the temperature in the hose vulcanizing tank is 160-170°C, and the pressure in the hose vulcanizing tank is controlled at 5-6 MPa for vulcanization and tube processing.

[0040] The mass ratio of polytetrafluoroethylene to cleaning agent is controlled to be 3:1. The polytetrafluoroethylene and cleaning agent are mixed evenly and then placed into a die of a cold extruder. The die is pressed tightly and heated to 190-240°C before extruding a sleeve. The sleeve is then placed vertically into a sintering furnace preheated to 900-1000°C and baked for 0.5-1.5 minutes. After cooling, a polytetrafluoroethylene inner tube 3 is obtained.

[0041] Prepare the following components by mass ratio: 100 parts of PE100 grade raw material, 50 parts of PU raw material, 10 parts of glass fiber, and 10 parts of carbon fiber;

[0042] Melt PE100 grade raw materials and PU raw materials at a melting temperature of 180-190°C for 10-15 minutes, add flame retardant after melting, and stir and mix at a stirring speed of 50-80 r / min to obtain a base material, arrange multiple glass fibers and carbon fibers in a cross-shaped manner, mix them evenly, make reinforcing fibers, add them to the base material, mix them evenly using a mixer, and then perform a homogenous dispersion treatment using ultrasound for 5-8 minutes, controlling the ultrasonic pressure to 1.15-1.18 MPa, and then add them to an extruder to extrude into a tube to obtain skeleton layer 2;

[0043] The protrusions 4 are prepared by extruding polytetrafluoroethylene, and the protrusions 4 are hot-melted onto the outside of the polytetrafluoroethylene inner tube 3. The polytetrafluoroethylene inner tube 3 is coated with a halogen-free adhesive 6. The skeleton layer 2 is sheathed onto the outside of the polytetrafluoroethylene inner tube 3, and fiber filaments 5 are inserted between the skeleton layer 2 and the protrusions 4.

[0044] Viscose is coated on the outside of the skeleton layer 2, and the outer rubber sleeve 1 is sleeved on the outside of the skeleton layer 2 to obtain a finished product.

[0045] Example 3

[0046] according to Figure 2 As shown, this embodiment provides a method for preparing a high-temperature resistant gas pipe for a welding machine, comprising the following steps:

[0047] Prepare the following ingredients by mass ratio: 50 parts of styrene-butadiene rubber, 50 parts of nitrile rubber, 4 parts of dioctyl phthalate, 2 parts of sulfur, 1 part of diphenylguanidine, 5 parts of zinc oxide, 55 parts of carbon black, 5 parts of paraffin oil, 12 parts of barium sulfate, 2 parts of stearic acid and 1 part of antioxidant;

[0048] Styrene-butadiene rubber and nitrile rubber are added to a mixer to be refined into a rubber mixture slurry, dioctyl phthalate, zinc oxide, and carbon black are added and mixed and stirred to form a mixed ingredient, and then the mixed ingredient, antioxidant, and stearic acid are added to the mixer in sequence for refining;

[0049] Sulfur, diphenylguanidine, paraffin oil, and barium sulfate are added to a mixer for refining to obtain a rubber base material. During the above process, the pressure in the mixer is controlled at 80-90 kPa, and the temperature in the mixer is controlled at 105-115 degrees Celsius. After each addition, the rubber base material is refined for 10-12 minutes. The rubber base material is then introduced into a rolling press for compression molding, and then placed in a rubber tube forming mold in a hose vulcanizing tank for vulcanization and tube processing. Finally, the outer rubber sleeve 1 is obtained after cooling to room temperature. The temperature in the rolling press is 60-80°C, the temperature in the hose vulcanizing tank is 160-170°C, and the pressure in the hose vulcanizing tank is controlled at 5-6 MPa for vulcanization and tube processing.

[0050] The mass ratio of polytetrafluoroethylene to cleaning agent is controlled to be 3:1. The polytetrafluoroethylene and cleaning agent are mixed evenly and then placed into a die of a cold extruder. The die is pressed tightly and heated to 190-240°C before extruding a sleeve. The sleeve is then placed vertically into a sintering furnace preheated to 900-1000°C and baked for 0.5-1.5 minutes. After cooling, a polytetrafluoroethylene inner tube 3 is obtained.

[0051] Prepare the following components by mass ratio: 120 parts of PE100 grade raw material, 60 parts of PU raw material, 12 parts of glass fiber, and 12 parts of carbon fiber;

[0052] Melt PE100 grade raw materials and PU raw materials at a melting temperature of 180-190°C for 10-15 minutes, add flame retardant after melting, and stir and mix at a stirring speed of 50-80 r / min to obtain a base material, arrange multiple glass fibers and carbon fibers in a cross-shaped manner, mix them evenly, make reinforcing fibers, add them to the base material, mix them evenly using a mixer, and then perform a homogenous dispersion treatment using ultrasound for 5-8 minutes, controlling the ultrasonic pressure to 1.15-1.18 MPa, and then add them to an extruder to extrude into a tube to obtain skeleton layer 2;

[0053] The protrusions 4 are prepared by extruding polytetrafluoroethylene, and the protrusions 4 are hot-melted onto the outside of the polytetrafluoroethylene inner tube 3. The polytetrafluoroethylene inner tube 3 is coated with a halogen-free adhesive 6. The skeleton layer 2 is sheathed onto the outside of the polytetrafluoroethylene inner tube 3, and fiber filaments 5 are inserted between the skeleton layer 2 and the protrusions 4.

[0054] Viscose is coated on the outside of the skeleton layer 2, and the outer rubber sleeve 1 is sleeved on the outside of the skeleton layer 2 to obtain a finished product.

[0055] Example 4

[0056] according to Figure 2 As shown, this embodiment provides a method for preparing a high-temperature resistant gas pipe for a welding machine, comprising the following steps:

[0057] Prepare the following ingredients by mass ratio: 60 parts of styrene-butadiene rubber, 70 parts of nitrile rubber, 5 parts of dioctyl phthalate, 3 parts of sulfur, 2 parts of diphenylguanidine, 6 parts of zinc oxide, 60 parts of carbon black, 8 parts of paraffin oil, 15 parts of barium sulfate, 3 parts of stearic acid and 2 parts of antioxidant;

[0058] Styrene-butadiene rubber and nitrile rubber are added to a mixer to be refined into a rubber mixture slurry, dioctyl phthalate, zinc oxide, and carbon black are added and mixed and stirred to form a mixed ingredient, and then the mixed ingredient, antioxidant, and stearic acid are added to the mixer in sequence for refining;

[0059] Sulfur, diphenylguanidine, paraffin oil, and barium sulfate are added to a mixer for refining to obtain a rubber base material. During the above process, the pressure in the mixer is controlled at 80-90 kPa, and the temperature in the mixer is controlled at 105-115 degrees Celsius. After each addition, the rubber base material is refined for 10-12 minutes. The rubber base material is then introduced into a rolling press for compression molding, and then placed in a rubber tube forming mold in a hose vulcanizing tank for vulcanization and tube processing. Finally, the outer rubber sleeve 1 is obtained after cooling to room temperature. The temperature in the rolling press is 60-80°C, the temperature in the hose vulcanizing tank is 160-170°C, and the pressure in the hose vulcanizing tank is controlled at 5-6 MPa for vulcanization and tube processing.

[0060] The mass ratio of polytetrafluoroethylene to cleaning agent is controlled to be 3:1. The polytetrafluoroethylene and cleaning agent are mixed evenly and then placed into a die of a cold extruder. The die is pressed tightly and heated to 190-240°C before extruding a sleeve. The sleeve is then placed vertically into a sintering furnace preheated to 900-1000°C and baked for 0.5-1.5 minutes. After cooling, a polytetrafluoroethylene inner tube 3 is obtained.

[0061] Prepare the following components by mass ratio: 130 parts of PE100 grade raw material, 70 parts of PU raw material, 15 parts of glass fiber, and 15 parts of carbon fiber;

[0062] Melt PE100 grade raw materials and PU raw materials at a melting temperature of 180-190°C for 10-15 minutes, add flame retardant after melting, and stir and mix at a stirring speed of 50-80 r / min to obtain a base material, arrange multiple glass fibers and carbon fibers in a cross-shaped manner, mix them evenly, make reinforcing fibers, add them to the base material, mix them evenly using a mixer, and then perform a homogenous dispersion treatment using ultrasound for 5-8 minutes, controlling the ultrasonic pressure to 1.15-1.18 MPa, and then add them to an extruder to extrude into a tube to obtain skeleton layer 2;

[0063] The protrusions 4 are prepared by extruding polytetrafluoroethylene, and the protrusions 4 are hot-melted onto the outside of the polytetrafluoroethylene inner tube 3. The polytetrafluoroethylene inner tube 3 is coated with a halogen-free adhesive 6. The skeleton layer 2 is sheathed onto the outside of the polytetrafluoroethylene inner tube 3, and fiber filaments 5 are inserted between the skeleton layer 2 and the protrusions 4.

[0064] Viscose is coated on the outside of the skeleton layer 2, and the outer rubber sleeve 1 is sleeved on the outside of the skeleton layer 2 to obtain a finished product.

[0065] According to Example 2, Example 3 and Example 4, it can be concluded that the present invention uses the following mass ratio components: outer rubber sleeve: 30-60 parts of styrene-butadiene rubber, 30-70 parts of nitrile rubber, 3-5 parts of di-n-octyl phthalate, 2-3 parts of sulfur, 1-2 parts of diphenylguanidine, 5-6 parts of zinc oxide, 50-60 parts of carbon black, 3-8 parts of paraffin oil, 10-15 parts of barium sulfate, 2-3 parts of stearic acid and 1-2 parts of antioxidant; skeleton layer: 100-130 parts of PE100 grade raw material, 50-70 parts of PU raw material, 10-15 parts of glass fiber, and 10-15 parts of carbon fiber. The prepared high-temperature resistant air pipe for welding machine has the characteristics of corrosion resistance, acid and alkali resistance, high temperature resistance, high lubrication, non-adhesion, etc., and is more tear-resistant and wear-resistant, and is not prone to local breakage, which greatly improves the overall physical properties.

[0066] Verification example:

[0067]

[0068] The present invention utilizes a skeletal layer made from melted PE100-grade and PU raw materials, mixed with glass fiber and carbon fiber. This layer is then coated on the outside of a PTFE inner tube, effectively tightening the PTFE inner tube and preventing it from expanding under heat. The fiber filaments connect the protrusions and skeletal layer, effectively stretching and limiting the inner PTFE inner tube, preventing it from contracting under cold and loosening. Furthermore, the PTFE inner tube is corrosion-resistant, acid- and alkali-resistant, high-temperature-resistant, highly lubricating, and non-sticky. It is physiologically inert and non-toxic to the human body. Its electrical insulation can withstand a voltage of 1500V. It also has a low coefficient of friction, resists adhesion, and is more durable. At the same time, the present invention mixes nitrile rubber and styrene butadiene rubber and uses them together, taking into account the performance of the two, effectively improving the wear resistance, having high mechanical properties, high mechanical properties and swelling resistance, and is combined with paraffin oil to improve the tensile strength of the rubber, making it more tear-resistant and wear-resistant. In addition, carbon black, barium sulfate and sulfur are added to improve its acid resistance, making it less prone to local breakage, and greatly improving the overall physical properties.

[0069] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-temperature resistant gas pipe for a welding machine, comprising an outer rubber sleeve (1), a skeleton layer (2) and a polytetrafluoroethylene inner tube (3), characterized in that: The skeleton layer (2) is adhered to the inner side of the outer rubber sleeve (1), the polytetrafluoroethylene inner tube (3) is arranged on the inner side of the skeleton layer (2), the outer side of the polytetrafluoroethylene inner tube (3) is provided with protrusions (4), and the protrusions (4) are provided in multiple groups, and fiber filaments (5) are inserted into the protrusions (4); The skeleton layer (2) is made of PE100 grade raw materials, PU raw materials melted and mixed with glass fiber and carbon fiber, the fiber filaments (5) are inserted into the interior of the skeleton layer (2), the gap between the skeleton layer (2) and the polytetrafluoroethylene inner tube (3) is filled with halogen-free viscose (6), and the outer rubber sleeve (1) is made of styrene-butadiene rubber, nitrile rubber, dioctyl phthalate, sulfur, diphenylguanidine, zinc oxide, carbon black, paraffin oil, barium sulfate, stearic acid and an antioxidant.

2. The high temperature resistant gas pipe for welding machine according to claim 1, characterized in that: The protrusion (4) is made of polytetrafluoroethylene material, and the protrusion (4) is integrally formed with the polytetrafluoroethylene inner tube (3) by hot melting.

3. A method for preparing a high temperature resistant gas pipe for a welding machine, characterized in that: The following steps are involved: S1: adding styrene-butadiene rubber and nitrile-butadiene rubber into a mixer to prepare a rubber mixture slurry, adding dioctyl phthalate, zinc oxide, and carbon black, mixing and stirring to prepare a mixed ingredient, and then sequentially adding the mixed ingredient, an antioxidant, and stearic acid into the mixer for refining; S2: sulfur, diphenylguanidine, paraffin oil, and barium sulfate are added to a mixer for refining to obtain a rubber base material, which is then introduced into a rolling press for compression molding, and then placed into a rubber tube forming mold in a hose vulcanizing tank for vulcanization and tube processing, and finally cooled to room temperature to obtain an outer rubber sleeve (1); S3: The polytetrafluoroethylene and the cleaning agent are mixed evenly and then put into the die of the cold extruder, and the die is pressed tightly, and the temperature is increased to extrude the sleeve, and then vertically put into a preheated sintering furnace for baking, and after cooling, the polytetrafluoroethylene inner tube (3) is obtained. S4: Melting PE100 grade raw materials and PU raw materials to obtain a base material, cross-arranging multiple glass fibers and carbon fibers, and mixing them evenly to make reinforcing fibers, adding them to the base material, mixing them evenly using a mixer, and then adding them to an extruder to extrude into a tube to obtain a skeleton layer (2); S5: using polytetrafluoroethylene extrusion to prepare a protrusion (4), hot-melting the protrusion (4) to the outside of the polytetrafluoroethylene inner tube (3), coating the outside of the polytetrafluoroethylene inner tube (3) with a halogen-free viscose (6), sleeve-mounting the skeleton layer (2) on the outside of the polytetrafluoroethylene inner tube (3), and inserting fiber filaments (5) between the skeleton layer (2) and the protrusion (4); S6: coating the outer side of the skeleton layer (2) with adhesive, and sleeve the outer rubber sleeve (1) onto the outer side of the skeleton layer (2) to obtain a finished product.

4. The method for preparing a high-temperature resistant gas pipe for a welding machine according to claim 3, characterized in that: In said S1 and S2, the outer rubber sleeve (1) comprises the following components in mass ratio: 30-60 parts of styrene-butadiene rubber, 30-70 parts of nitrile rubber, 3-5 parts of di-n-octyl phthalate, 2-3 parts of sulfur, 1-2 parts of diphenylguanidine, 5-6 parts of zinc oxide, 50-60 parts of carbon black, 3-8 parts of paraffin oil, 10-15 parts of barium sulfate, 2-3 parts of stearic acid and 1-2 parts of antioxidant.

5. The method for preparing a high-temperature resistant gas pipe for a welding machine according to claim 4, characterized in that: In S1 and S2, the pressure in the mixer is controlled to be 80-90 kPa, the temperature in the mixer is controlled to be 105-115 degrees Celsius, the refining is carried out for 10-12 minutes after each addition of materials, the temperature in the rolling press is 60-80°C, the temperature in the hose vulcanization tank is 160-170°C, and the pressure in the hose vulcanization tank is controlled to be 5-6 MPa for vulcanization pipe making processing.

6. The method for preparing a high-temperature resistant gas pipe for a welding machine according to claim 3, characterized in that: In the step S3, the mass ratio of polytetrafluoroethylene to the cleaning agent is controlled to be 3:1, and in the step S3, the die is heated to 190-240°C and then a sleeve is extruded. The extruded sleeve is vertically placed in a sintering furnace preheated to 900-1000°C and baked for 0.5-1.5 minutes.

7. The method for preparing a high-temperature resistant gas pipe for a welding machine according to claim 3, characterized in that: In said S4, the skeleton layer (2) comprises the following components in mass ratio: 100-130 parts of PE100 grade raw material, 50-70 parts of PU raw material, 10-15 parts of glass fiber, and 10-15 parts of carbon fiber.

8. The method for preparing a high-temperature resistant gas pipe for a welding machine according to claim 7, characterized in that: In the S4, the PE100 grade raw material and the PU raw material are melted at a melting temperature of 180-190° C. for 10-15 minutes, and a flame retardant is added thereto after melting, and the mixture is stirred and mixed at a stirring speed of 50-80 r / min to obtain a base material.

9. The method for preparing a high-temperature resistant gas pipe for a welding machine according to claim 8, characterized in that: In the above S4, the reinforcing fibers are added to the base material, mixed evenly, and then subjected to a homogenous dispersion treatment using ultrasound for 5-8 minutes, with the ultrasound pressure controlled at 1.15-1.18 MPa, before being added to the extruder.

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