High-temperature-resistant polyethylene pipeline

Abstract

The invention relates to the technical field of polyethylene pipelines, and discloses a high-temperature-resistant polyethylene pipeline which comprises the following components in percentage by weight: 40-60% of high-density polyethylene resin, 10-20% of polyphenylene sulfide (PPS) resin, 5-10% of nano silicate, 5-10% of carbon fibers, 0.5-2% of graphene, 0.5-2% of an antioxidant and 0.5-2% of an ultraviolet stabilizer. The high-density polyethylene resin is used as a main body material of the pipeline and provides basic physical and mechanical properties; polyphenylene sulfide (PPS) resin is used for improving the high temperature resistance of a base material, and it is ensured that the pipeline can be used for a long time at the high temperature; by adding the polyphenylene sulfide (PPS) resin, the high temperature resistance of the pipeline is remarkably improved, and the PPS resin has a high melting point, so that a final pipeline product can be used for a long time at the temperature of 150-200 DEG C, and the use temperature far exceeds the use temperature upper limit of a traditional polyethylene pipeline; and by adding the nano silicate, the chemical stability of the pipeline is improved, and the pipeline can resist erosion of various chemical substances.

Description

Technical Field

[0001] The invention relates to the technical field of polyethylene pipes, in particular to high-temperature resistant polyethylene pipes. Background Art

[0002] Polyethylene pipe is a plastic pipe made of polyethylene as raw material. It is widely used in water supply and gas transportation and many other fields. Polyethylene pipe occupies an important position among various pipes due to its excellent chemical corrosion resistance, good hygiene performance, long service life and other characteristics. Polyethylene pipe is widely used in urban tap water network systems, urban and rural drinking water pipelines, chemical, chemical fiber, food, forestry, printing and dyeing, pharmaceutical and other industrial liquid transportation pipelines and agricultural irrigation pipelines. Due to its easy transportation, simple construction, low comprehensive project cost and significant economic benefits, polyethylene pipe has a longer service life and lower maintenance cost than steel pipes and other traditional materials.

[0003] Traditional polyethylene pipes have been widely used in water supply, drainage, chemical fluid transportation and other fields due to their excellent chemical stability, wear resistance and processing performance. However, traditional polyethylene pipes have some obvious limitations, especially the insufficient performance in high-temperature application environments. First, polyethylene materials have poor heat resistance and can usually only be used in environments below their melting point (generally between 80°C and 100°C), which limits their application in high-temperature industrial fields. Secondly, the mechanical strength and pressure resistance of traditional polyethylene pipes will decrease significantly under high temperature conditions, causing the pipes to be easily deformed or damaged, which in turn affects the reliability and service life of the pipeline system. In addition, with the development of industry and the improvement of environmental protection requirements, higher requirements are also placed on the corrosion resistance and environmental adaptability of pipeline materials. Traditional polyethylene pipes need to be further optimized in terms of corrosion resistance and environmental adaptability. Summary of the invention

[0004] In view of the obvious limitations of conventional polyethylene pipes in the prior art, especially the problem of insufficient performance in high-temperature application environments, a high-temperature resistant polyethylene pipe is proposed.

[0005] The present application provides a high-temperature resistant polyethylene pipe, the purpose of which is to significantly improve the high-temperature resistance, mechanical strength, and chemical and dimensional stability of the pipe by introducing high-temperature resistant materials and modifiers, such as polyphenylene sulfide resin, nanosilicate, carbon fiber, and graphene. At the same time, by adding antioxidants and UV stabilizers, the aging resistance and UV radiation resistance of the pipe are enhanced, thereby extending the service life of the pipe. In addition, by adding lubricants and colorants, the surface quality and appearance characteristics of the pipe are improved, making it more suitable for modern industrial and civil needs.

[0006] The technical solution of the present invention is: a high temperature resistant polyethylene pipe, comprising the following components in weight percentage: 40-60% of high density polyethylene resin, 10-20% of polyphenylene sulfide resin, 5-10% of nano silicate, 5-10% of carbon fiber, 0.5-2% of graphene, 0.5-2% of antioxidant and 0.5-2% of ultraviolet stabilizer; The high-density polyethylene resin is used as the main material of the pipe and provides basic physical and mechanical properties; The polyphenylene sulfide resin is used to improve the high temperature resistance of the base material, ensuring that the pipeline can be used for a long time at a higher temperature; The nano-silicate is used to enhance the dimensional stability and chemical corrosion resistance of the pipeline, while improving the mechanical rigidity of the pipeline; The carbon fiber is used to significantly enhance the mechanical strength of the pipeline and improve its performance retention in a high temperature environment; The graphene is used as a two-dimensional reinforcing filler to improve thermal conductivity and electrical conductivity; The antioxidant is used to prevent the pipeline material from oxidative degradation under high temperature conditions and extend the service life of the pipeline; The ultraviolet stabilizer is used to protect the pipeline from damage by ultraviolet radiation during use and maintain the stability of physical properties.

[0007] Furthermore, the density of the high-density polyethylene resin is in the range of 0.940-0.960 g / cm³ to ensure that the pipeline has good mechanical strength and pressure resistance.

[0008] Furthermore, the molecular weight of the polyphenylene sulfide resin is between 15,000 and 30,000 g / mol to ensure the thermal stability and chemical stability of the resin at high temperatures.

[0009] Furthermore, the average particle size of the nano-silicate is less than 100 nm, so as to enhance the dimensional stability and chemical corrosion resistance of the pipeline.

[0010] Furthermore, the carbon fiber has a length of 0.1-10 mm and a diameter of 5-10 μm, which is used to significantly improve the mechanical strength and heat resistance of the pipeline.

[0011] Furthermore, the graphene sheet size is between 0.1-10 μm, which is used to make the pipeline have excellent thermal conductivity and electrical conductivity.

[0012] Furthermore, the invention further comprises 0.1-0.5% of a lubricant, wherein the lubricant is any one of fatty acid amide, silicone oil or a combination thereof, so as to improve the surface smoothness of the pipeline material.

[0013] Furthermore, the invention further comprises 0.05-0.2% of a colorant, wherein the colorant is any one of an inorganic pigment or an organic pigment, and is used to provide the required color and appearance characteristics of the pipeline.

[0014] Furthermore, the graphene contains functional groups such as hydroxyl, carboxyl or amine to enhance its interfacial interaction with high-density polyethylene resin, thereby more effectively improving the thermal conductivity and electrical conductivity of the pipeline.

[0015] Furthermore, the glass transition temperature of the polyphenylene sulfide resin is 150-200° C., thereby ensuring the stability and durability of the pipeline in a high temperature environment.

[0016] Furthermore, the present invention also provides a method for preparing a high temperature resistant polyethylene pipe, and the method steps are as follows: S1: Accurately weigh the various raw materials used to prepare the high temperature resistant polyethylene pipe according to the formula; S2: Evenly mix the prepared raw materials for making high temperature resistant polyethylene pipes; S3: Melting and kneading the mixed raw materials; S4: Extruding the molten raw material; S5: Cooling and shaping the extruded pipe; S6: Pulling and cutting the pipe after cooling and shaping to prepare a high temperature resistant polyethylene pipe.

[0017] In S1, 40-60% of high-density polyethylene resin, 10-20% of polyphenylene sulfide resin, 5-10% of nano-silicate, 5-10% of carbon fiber, 0.5-2% of graphene, 0.5-2% of antioxidant and 0.5-2% of ultraviolet stabilizer are accurately weighed according to the formula ratio.

[0018] In S2, the solid powder and granular raw materials in S1 are placed in a high-speed mixer for dry mixing to ensure that each component is evenly dispersed. The mixing time is 10-15 minutes.

[0019] In S3, the mixed raw materials are added to a twin-screw extruder, and the temperature of each section of the twin-screw extruder is controlled between 200-240°C. The specific temperature settings are as follows: 200°C for the feed section, 220°C for the middle section, and 240°C for the discharge section. The polymer material for preparing the high-temperature resistant polyethylene pipe is well mixed and plasticized at high temperature through the twin-screw extruder.

[0020] In S4, the molten composite material is extruded through a specific die. The die is designed according to the diameter, wall thickness and tolerance requirements of the pipe, so as to ensure the dimensional accuracy and surface quality of the pipe.

[0021] In S5, the extruded pipe is cooled and shaped by a cooling water tank, the temperature of which is controlled at 15-25°C and the flow rate is 0.5-1.5 m³ / h, thereby ensuring that the pipe is cooled quickly and evenly to prevent shape deformation and stress concentration.

[0022] In S6, the pipe after cooling and shaping is guided forward by the traction device and cut into a specified length by the cutting machine as required, and finally the required high temperature resistant polyethylene pipe is obtained.

[0023] Beneficial effects of the present invention: 1. The present invention significantly improves the high temperature resistance of the pipeline by adding polyphenylene sulfide (PPS) resin. Polyphenylene sulfide (PPS) resin has a high melting point, so that the final pipeline product can be used for a long time at a temperature as high as 150°C to 200°C, which far exceeds the upper temperature limit of traditional polyethylene pipes.

[0024] 2. The introduction of carbon fiber and nanosilicate not only enhances the mechanical strength of the pipeline, but also improves its wear resistance and pressure resistance, making the pipeline more able to withstand physical shocks and pressure fluctuations in rough environments, reducing the frequency of maintenance and replacement due to mechanical damage.

[0025] 3. The addition of nano-silicate improves the chemical stability of the pipeline, making it resistant to corrosion by a variety of chemical substances. It is particularly suitable for industrial applications that require corrosion resistance, such as chemical and wastewater treatment.

[0026] 4. By using highly thermally stable materials such as polyphenylene sulfide resin and nano-silicate, the pipe can maintain dimensional stability in high temperature environments, reducing pipe shape changes and expansion or contraction problems caused by temperature differences.

[0027] 5. By adding graphene, the pipeline has excellent electrical and thermal conductivity. This property can expand the application range of the pipeline, making it a heat transfer medium in systems that require geothermal heating or electric heating.

[0028] 6. Through the protection of antioxidants and UV stabilizers, the pipeline can resist aging and performance degradation caused by long-term UV exposure, extending the service life of the pipeline.

[0029] 7. The use of lubricants reduces the friction between materials during the production process, which not only increases the extrusion speed and reduces energy consumption, but also makes the surface of the final product smoother and reduces the need for subsequent processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The figure is a schematic diagram of the steps of the method for preparing the high temperature resistant polyethylene pipe of the present invention. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0032] Example, see Figure 1 , a high temperature resistant polyethylene pipe is provided, comprising the following components in percentage by weight: High-density polyethylene resin 40-60%, high-density polyethylene resin is the main material of the pipe, providing basic physical and mechanical properties; polyphenylene sulfide (PPS) resin 10-20%, polyphenylene sulfide (PPS) resin is used to improve the high temperature resistance of the base material to ensure that the pipe can be used for a long time at a higher temperature; nano-silicate 5-10%, nano-silicate is used to enhance the dimensional stability and chemical corrosion resistance of the pipe, while improving the mechanical rigidity of the pipe; carbon fiber 5-10%, carbon fiber is used to significantly enhance the mechanical strength of the pipe, and at the same time to improve its performance retention in a high temperature environment; graphite Graphene 0.5-2%, graphene is used as a two-dimensional reinforcing filler to improve thermal conductivity and electrical conductivity, making the pipeline have potential application value in the fields of sensing and heating; antioxidant 0.5-2%, antioxidant uses any one of aromatic amines, phenolic compounds or a combination thereof, which is used to prevent oxidative degradation of pipeline materials under high temperature conditions and extend the service life of the pipeline; UV stabilizer 0.5-2%, UV stabilizer uses any one of hindered amine light stabilizer (HALS), UV absorber or a combination thereof, which is used to protect the pipeline from damage by ultraviolet radiation during use and maintain the stability of physical properties.

[0033] The invention further comprises 0.1-0.5% of a lubricant, wherein the lubricant is any one of fatty acid amide, silicone oil or a combination thereof, so as to improve the surface smoothness of the pipeline material.

[0034] The invention further comprises 0.05-0.2% of a colorant, wherein the colorant is any one of an inorganic pigment or an organic pigment, and is used to provide the pipeline with the required color and appearance characteristics.

[0035] The density of high-density polyethylene resin ranges from 0.940-0.960 g / cm³ to ensure that the pipe has good mechanical strength and pressure resistance.

[0036] The molecular weight of the polyphenylene sulfide resin is between 15,000 and 30,000 g / mol to ensure the thermal stability and chemical stability of the resin at high temperatures.

[0037] The average particle size of nanosilicate is less than 100nm to enhance the dimensional stability and chemical corrosion resistance of the pipeline.

[0038] The carbon fibers have a length of 0.1-10 mm and a diameter of 5-10 ‌μm and are used to significantly improve the mechanical strength and heat resistance of the pipes.

[0039] Graphene sheets range in size from 0.1 to 10 μm and are used to give pipes excellent thermal and electrical conductivity.

[0040] Graphene contains functional groups such as hydroxyl, carboxyl or amine groups to enhance its interfacial interaction with high-density polyethylene resin, thereby more effectively improving the thermal conductivity and electrical conductivity of the pipe.

[0041] The glass transition temperature of polyphenylene sulfide resin is 150-200°C, which ensures the stability and durability of the pipeline in high temperature environments.

[0042] The preparation method of high temperature resistant polyethylene pipe is as follows: S1: Accurately weigh the various raw materials used to prepare high-temperature resistant polyethylene pipes according to the formula; accurately weigh 40-60% high-density polyethylene resin, 10-20% polyphenylene sulfide (PPS) resin, 5-10% nano-silicate, 5-10% carbon fiber, 0.5-2% graphene, 0.5-2% antioxidant and 0.5-2% UV stabilizer according to the formula ratio.

[0043] S2: Evenly mix the prepared raw materials for making high temperature resistant polyethylene pipes; put the solid powder and granular raw materials in S1 into a high-speed mixer for dry mixing to ensure that each component is evenly dispersed, and the mixing time is 10-15 minutes.

[0044] S3: Melt-mixing the mixed raw materials; adding the mixed raw materials into a twin-screw extruder, controlling the temperature of each section of the twin-screw extruder between 200-240°C, and the specific temperature settings are as follows: 200°C for the feed section, 220°C for the middle section, and 240°C for the discharge section. The polymer material used to prepare the high-temperature resistant polyethylene pipe is well mixed and plasticized at high temperature through the twin-screw extruder.

[0045] S4: Extrusion molding of the molten raw materials; the molten composite material is extruded through a specific die, and the die is designed according to the diameter of the pipe (such as from 1 inch to 12 inches), wall thickness (such as from 0.5mm to 5mm) and its tolerance requirements, so as to ensure the dimensional accuracy and surface quality of the pipe.

[0046] S5: Cooling and shaping the extruded pipe; The extruded pipe is cooled and shaped through a cooling water tank. The temperature of the cooling water tank is controlled at 15-25°C and the flow rate is 0.5-1.5 m³ / h, so as to ensure that the pipe is cooled quickly and evenly to prevent shape deformation and stress concentration.

[0047] S6: The pipe after cooling and shaping is pulled and cut to prepare a high-temperature resistant polyethylene pipe; the pipe after cooling and shaping is guided forward by the pulling equipment and cut into a specified length (such as 6 meters or 12 meters) by the cutting machine as required. The pulling speed needs to match the extrusion speed to maintain the size consistency of the pipe, and finally the required high-temperature resistant polyethylene pipe is obtained.

[0048] Embodiment 1: A high temperature resistant polyethylene pipe is prepared, the composition of which is as follows: High density polyethylene resin: 50% Polyphenylene sulfide (PPS) resin: 15% Nano silicate: 7% Carbon Fiber: 7% Graphene: 1% Antioxidant: 1% UV stabilizer: 1% The components are mixed according to the above proportions, and the required high-temperature resistant polyethylene pipe is prepared through an extrusion molding process. The specific process includes: after the raw materials are dry-mixed in proportion, they are added into a twin-screw extruder, melt-kneaded at a temperature of 200-240°C, and then extruded through a mold, and cooled and formed, and finally rolled and cut. The prepared pipe has excellent high-temperature resistance and can be used in an environment with a continuous temperature of up to 150°C. After testing, its tensile strength is increased by 30% and its pressure resistance is increased by 25%.

[0049] Embodiment 2: In this example, the proportions of some components were adjusted to optimize performance: High-density polyethylene resin: 45% Polyphenylene sulfide (PPS) resin: 18% Nano silicate: 8% Carbon Fiber: 8% Graphene: 1.5% Antioxidants: 1.5% UV stabilizer: 1.5% The pipe is prepared by an extrusion molding process, and the specific process includes: after the raw materials are dry-mixed in proportion, they are added into a twin-screw extruder, melt-kneaded at a temperature of 220-260°C, and then extruded through a specially designed mold, and water-cooled and shaped, and finally rolled and cut. The obtained pipe can remain stable in a high temperature environment of 180°C, and the tensile strength and pressure resistance are respectively improved by 15% and 10% compared with Example 1.

[0050] Embodiment 3: Further adjust the formula to add lubricants and colorants: High density polyethylene resin: 55% Polyphenylene sulfide (PPS) resin: 12% Nano silicate: 6% Carbon Fiber: 6% Graphene: 1.5% Antioxidant: 1% UV stabilizer: 1% Lubricant: 0.3% Colorant: 0.2% The same extrusion molding process is adopted for preparation, and the specific process includes: after the raw materials are dry-mixed in proportion, they are added into a twin-screw extruder, melt-kneaded at a temperature of 230-250°C, and then extruded through a mold, and cooled and shaped, and finally rolled and cut. After adding a lubricant and a colorant, the appearance and surface smoothness of the pipeline are improved, which is beneficial to the installation and maintenance of the pipeline. The durability of the pipeline in this embodiment in a high temperature environment is further improved, and it can withstand a temperature of up to 200°C for a long time, and its tensile strength and pressure resistance are improved by 10% compared with Example 2.

[0051] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. High temperature resistant polyethylene pipe, characterized by: The invention comprises the following components in weight percentage: 40-60% of high-density polyethylene resin, 10-20% of polyphenylene sulfide resin, 5-10% of nano silicate, 5-10% of carbon fiber, 0.5-2% of graphene, 0.5-2% of antioxidant and 0.5-2% of ultraviolet stabilizer; The high-density polyethylene resin is used as the main material of the pipe and provides basic physical and mechanical properties; The polyphenylene sulfide resin is used to improve the high temperature resistance of the base material, ensuring that the pipeline can be used for a long time at a higher temperature; The nano-silicate is used to enhance the dimensional stability and chemical corrosion resistance of the pipeline, while improving the mechanical rigidity of the pipeline; The carbon fiber is used to significantly enhance the mechanical strength of the pipeline and improve its performance retention in a high temperature environment; The graphene is used as a two-dimensional reinforcing filler to improve thermal conductivity and electrical conductivity; The antioxidant is used to prevent the pipeline material from oxidative degradation under high temperature conditions and extend the service life of the pipeline; The ultraviolet stabilizer is used to protect the pipeline from damage by ultraviolet radiation during use and maintain the stability of physical properties.

2. The high temperature resistant polyethylene pipe according to claim 1, characterized in that: The density of the high-density polyethylene resin is in the range of 0.940-0.960 g / cm³ to ensure that the pipeline has good mechanical strength and pressure resistance.

3. The high temperature resistant polyethylene pipe according to claim 1, characterized in that: The molecular weight of the polyphenylene sulfide resin is between 15,000 and 30,000 g / mol to ensure the thermal stability and chemical stability of the resin at high temperatures.

4. The high temperature resistant polyethylene pipe according to claim 1, characterized in that: The average particle size of the nano-silicate is less than 100 nm, so as to enhance the dimensional stability and chemical corrosion resistance of the pipeline.

5. The high temperature resistant polyethylene pipe according to claim 1, characterized in that: The carbon fiber has a length of 0.1-10 mm and a diameter of 5-10 μm, and is used to significantly improve the mechanical strength and heat resistance of the pipeline.

6. The high temperature resistant polyethylene pipe according to claim 1, characterized in that: The graphene sheet size is between 0.1-10 μm, and is used to make the pipeline have excellent thermal conductivity and electrical conductivity.

7. The high temperature resistant polyethylene pipe according to claim 1, characterized in that: The invention further comprises 0.1-0.5% of a lubricant, wherein the lubricant is any one of fatty acid amide, silicone oil or a combination thereof, so as to improve the surface smoothness of the pipeline material.

8. The high temperature resistant polyethylene pipe according to claim 1, characterized in that: The invention further comprises 0.05-0.2% of a colorant, wherein the colorant is any one of an inorganic pigment or an organic pigment, and is used to provide the pipeline with the required color and appearance characteristics.

9. The high temperature resistant polyethylene pipe according to claim 1, characterized in that: The graphene contains functional groups such as hydroxyl, carboxyl or amine to enhance the interface interaction between the graphene and the high-density polyethylene resin, thereby more effectively improving the thermal conductivity and electrical conductivity of the pipeline.

10. The high temperature resistant polyethylene pipe according to claim 1, characterized in that: The glass transition temperature of the polyphenylene sulfide resin is 150-200° C., thereby ensuring the stability and durability of the pipeline in a high temperature environment.

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