Anti-ultraviolet and anti-aging PE (polyethylene) water pipe and preparation process thereof
By incorporating a carbon black-containing ultraviolet shielding layer, insulation layer, and heat storage layer into the PE water pipe, the aging problem caused by ultraviolet rays and high temperatures is solved, achieving an effective anti-aging effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ANHUI HUAYUAN PLASTICS TECH CO LTD
- Filing Date
- 2026-01-30
- Publication Date
- 2026-05-15
AI Technical Summary
Existing PE water pipes are prone to aging under ultraviolet light and high temperatures. Traditional methods of adding ultraviolet absorbers have failed to effectively reduce the damage to water pipes caused by temperature changes, resulting in a shortened service life.
It adopts an inside-out structural design, including a polyethylene layer, a heat insulation layer, a heat storage layer, a spiral heat conduction layer, and a UV shielding layer. By setting a UV shielding layer with carbon black to block ultraviolet rays, the heat insulation layer reduces temperature transfer, the heat storage layer absorbs and slows down heat transfer, and the spiral heat conduction layer conducts heat evenly and delays aging.
It effectively blocks ultraviolet rays, reduces the rate of temperature transfer, slows down the aging process, and extends the service life.
Smart Images
Figure CN122034426A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of PE water pipe technology, specifically to an anti-ultraviolet and anti-aging PE water pipe and its manufacturing process. Background Technology
[0002] PE water pipes, or polyethylene water pipes, are made of high-density polyethylene, which is often used as a material for water pipes due to its excellent properties. Polyethylene water pipes have excellent resistance to environmental stress cracking and impact, can withstand low-temperature environments, and have excellent corrosion resistance due to their good chemical stability. However, when used outdoors, polyethylene water pipes are easily affected by ultraviolet rays and high temperatures, which can cause them to age rapidly and shorten their service life. Some products have a protective layer wrapped around the polyethylene, but the material of this protective layer is different from that of the inner polyethylene pipe. This protective layer will frequently expand and contract under frequent temperature changes, causing it to age faster due to frequent deformation.
[0003] The existing defects of PE water pipes are: Existing technology CN116239835B discloses a high-strength polyethylene water supply pipe and its preparation method, including the following process: taking high-density polyethylene, zinc oxide, and processing aids as inner layer raw materials, and modified polyethylene, modified calcium sulfate whiskers, and processing aids as outer layer raw materials, and performing double-layer co-extrusion to form an inner layer and an outer layer, thereby obtaining a polyethylene water supply pipe; the high-density polyethylene in the outer layer raw material is cross-linked with an epoxy resin having unsaturated double bonds under the action of a peroxide cross-linking agent, and the calcium sulfate whiskers are modified by an amino coupling agent. This invention uses high-strength high-density polyethylene as the main resin component of the water supply pipe, and adds nano-zinc oxide and calcium sulfate whiskers as reinforcing agents to the inner and outer layer raw materials of the polyethylene water supply pipe, respectively, to exert their physical cross-linking and heterogeneous nucleation effects, thereby improving the mechanical properties of the manufactured polyethylene water supply pipe.
[0004] The aforementioned technologies do not take into account the effects of ultraviolet radiation and temperature on polyethylene water pipes. Polyethylene water pipes are prone to generating free radicals under ultraviolet radiation or high temperatures, which accelerates the aging of polyethylene water pipes and shortens their service life. Although the traditional method of adding ultraviolet absorbers to water pipes can reduce some of the damage caused by ultraviolet radiation, the increase in light and temperature will also accelerate the aging of polyethylene water pipes. Therefore, a UV-resistant and anti-aging PE water pipe that can reduce the damage of external temperature to polyethylene water pipes and slow down the temperature change rate of the outer protective layer of polyethylene is needed to solve this problem. Summary of the Invention
[0005] One objective of this application is to provide an anti-ultraviolet and anti-aging PE water pipe and its manufacturing process, which can solve the technical problems raised in the prior art.
[0006] To achieve the above objectives, the present invention provides the following technical solution: an anti-ultraviolet and anti-aging PE water pipe, wherein the anti-ultraviolet and anti-aging PE water pipe comprises, from the inside out, a polyethylene layer, a heat insulation layer, a heat storage layer, a spiral heat conduction layer, and an ultraviolet shielding layer, wherein the heat insulation layer is disposed on the outside of the polyethylene layer, the heat storage layer is disposed on the outside of the heat insulation layer, the spiral heat conduction layer is disposed on the outside of the heat insulation layer in a spiral winding manner, and the spiral heat conduction layer is immersed in the interior of the heat storage layer, and the ultraviolet shielding layer is disposed on the outside of the heat storage layer.
[0007] Preferably, the polyethylene layer comprises, by weight, 90-100 parts high-density polyethylene, 5-10 parts antioxidant, 5-10 parts ultraviolet absorber and 5-10 parts toughening agent.
[0008] Preferably, the antioxidant is one of 3,5-di-tert-butyl-4-hydroxybenzyl phosphate diethyl ester, 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanurate and pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].
[0009] Preferably, the ultraviolet absorber is one of 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-di-tert-pentylphenyl)benzotriazole, and 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole.
[0010] Preferably, the toughening agent is one of maleic anhydride-grafted EPDM rubber and ethylene-octene copolymer.
[0011] Preferably, the heat insulation layer comprises 40-50 parts by weight of plastic and 4-8 parts by weight of foaming agent, wherein the plastic is one of polyethylene plastic and polyvinyl chloride plastic, and the foaming agent is one of sodium bicarbonate and ammonium bicarbonate.
[0012] Preferably, the heat storage layer is made of paraffin wax, and the spiral heat-conducting tape is made of thermally conductive silicone.
[0013] Preferably, the ultraviolet shielding layer comprises 40-60 parts by weight of carbon black particles and 50-70 parts by weight of polyethylene.
[0014] Preferably, the manufacturing process of the UV-resistant and anti-aging PE water pipe includes the following steps: S1. High-density polyethylene, antioxidant, ultraviolet absorber and toughening agent are added to an extruder and melted at a melting temperature of 190°C. Then, the polyethylene layer is formed by extrusion through the extruder. S2. Next, the plastic and foaming agent are added to the extruder for melting, and then extruded through the extruder to form a heat insulation layer on the outside of the polyethylene layer; S3. Then, the thermally conductive silicone tape is wound around the outside of the insulation layer in a spiral shape with a certain spiral gap to form a spiral thermal conductive tape. Subsequently, solid paraffin is coated on the outside of the insulation layer to form a heat storage layer, and the solid paraffin is distributed inside the spiral gap of the spiral thermal conductive tape.
[0015] Preferably, step S3 further includes the following steps: S31. Carbon black granules and polyethylene are added to an extruder and heated to melt at a melting temperature of 160°C. The mixture is then extruded through the extruder onto the outside of the heat storage layer to form an ultraviolet shielding layer.
[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention effectively blocks ultraviolet rays by setting an ultraviolet shielding layer with carbon black. The carbon black can absorb ultraviolet rays, thereby reducing the damage of external ultraviolet rays to the internal polyethylene layer, slowing down the aging rate of the polyethylene layer, and extending the service life of the polyethylene layer.
[0017] 2. The present invention can effectively reduce the transfer of external temperature to the internal polyethylene layer through the heat insulation layer, thereby reducing the transfer of external light temperature to the polyethylene layer and slowing down the aging rate of the polyethylene layer due to temperature rise.
[0018] 3. This invention, by setting a heat storage layer, can absorb part of the heat from the ultraviolet shielding layer. Furthermore, the paraffin heat storage can reduce the rate of heat transfer to the inner polyethylene layer, thereby reducing the rate of temperature rise of the polyethylene layer. In addition, the heat storage layer absorbs the heat from the ultraviolet shielding layer, thereby reducing the rate of temperature rise of the ultraviolet shielding layer, thus reducing the rate of deformation of the ultraviolet shielding layer due to thermal expansion and contraction, reducing fatigue caused by excessive thermal expansion and contraction of the ultraviolet shielding layer, and reducing the aging rate of the ultraviolet shielding layer.
[0019] 4. By setting a spiral heat-conducting tape, the present invention can quickly guide the heat from one side of the ultraviolet shielding layer to the other side of the ultraviolet shielding layer. At the same time, it can quickly transfer the heat of the local ultraviolet shielding layer to other parts on the axis of the ultraviolet shielding layer that are not exposed to sunlight, thereby further reducing the heating rate of the ultraviolet shielding layer and reducing the thermal aging rate of the ultraviolet shielding layer. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a flowchart of the preparation process of the present invention.
[0021] In the diagram: 1. Polyethylene layer; 2. Insulation layer; 3. Heat storage layer; 4. Spiral heat conduction tape; 5. Ultraviolet shielding layer. Detailed Implementation
[0022] 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.
[0023] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0025] Please see Figure 1 and Figure 2 An anti-ultraviolet and anti-aging PE water pipe is provided. The anti-ultraviolet and anti-aging PE water pipe includes, from the inside out, a polyethylene layer 1, a heat insulation layer 2, a heat storage layer 3, a spiral heat conduction layer 4, and an ultraviolet shielding layer 5. The heat insulation layer 2 is disposed on the outside of the polyethylene layer 1, the heat storage layer 3 is disposed on the outside of the heat insulation layer 2, the spiral heat conduction layer 4 is disposed on the outside of the heat insulation layer 2 in a spiral winding manner, and the spiral heat conduction layer 4 is immersed in the interior of the heat storage layer 3. The ultraviolet shielding layer 5 is disposed on the outside of the heat storage layer 3.
[0026] The polyethylene layer 1 comprises, by weight, 90-100 parts high-density polyethylene, 5-10 parts antioxidant, 5-10 parts ultraviolet absorber and 5-10 parts toughening agent.
[0027] The antioxidant is one of 3,5-di-tert-butyl-4-hydroxybenzyl phosphate diethyl ester, 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanurate and pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]. The antioxidant can combine with free radicals in polyethylene layer 1, thereby terminating the oxidation in polyethylene layer 1 and reducing the aging rate of polyethylene layer 1.
[0028] The ultraviolet absorber is one of 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-di-tert-pentylphenyl)benzotriazole, and 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole. The ultraviolet absorber is used to absorb ultraviolet rays that are irradiated onto the polyethylene layer 1 from the outside, thereby reducing the aging rate of the polyethylene layer 1 caused by ultraviolet irradiation.
[0029] The toughening agent is one of maleic anhydride-grafted EPDM rubber and ethylene-octene copolymer. The toughening agent is used to increase the toughness of polyethylene layer 1.
[0030] The insulation layer 2 comprises 40-50 parts plastic and 4-8 parts foaming agent by weight. The plastic is either polyethylene or polyvinyl chloride, and the foaming agent is either sodium bicarbonate or ammonium bicarbonate. The insulation layer 2 is used to reduce the transfer of external temperature to the polyethylene layer 1, thereby reducing the thermal oxidation of the polyethylene layer 1 and slowing down the aging rate of the polyethylene layer 1.
[0031] The heat storage layer 3 is made of paraffin wax, and the spiral heat-conducting tape 4 is made of thermally conductive silicone. The heat storage layer 3 can absorb some of the heat from the ultraviolet shielding layer 5, and the paraffin wax heat storage can reduce the rate of heat transfer to the inner polyethylene layer 1, thereby reducing the rate of temperature rise of the polyethylene layer 1. The heat storage layer 3 absorbs the heat from the ultraviolet shielding layer 5, thereby reducing the rate of temperature rise of the ultraviolet shielding layer 5, thus reducing the rate of deformation of the ultraviolet shielding layer 5 due to thermal expansion and contraction, reducing fatigue caused by excessive thermal expansion and contraction of the ultraviolet shielding layer 5, and reducing the aging rate of the ultraviolet shielding layer. The spiral heat-conducting tape 4 can quickly transfer the heat from one side of the ultraviolet shielding layer 5 to the other side of the ultraviolet shielding layer 5, and at the same time, can quickly transfer the heat from the local ultraviolet shielding layer 5 to other parts of the ultraviolet shielding layer 5 that are not exposed to sunlight, thereby further reducing the rate of temperature rise of the ultraviolet shielding layer 5 and reducing the rate of thermal aging of the ultraviolet shielding layer 5.
[0032] The ultraviolet shielding layer 5 comprises, by weight, 40-60 parts carbon black particles and 50-70 parts polyethylene.
[0033] The manufacturing process of UV-resistant and anti-aging PE water pipes includes the following steps: S1. High-density polyethylene, antioxidant, ultraviolet absorber and toughening agent are added to an extruder and melted at a melting temperature of 190°C. Then, the polyethylene layer 1 is formed by extrusion through the extruder. S2. Next, the plastic and foaming agent are added to the extruder for melting, and then extruded through the extruder to form the heat insulation layer 2 on the outside of the polyethylene layer 1. S3. Then, the thermally conductive silicone tape is wound around the outside of the insulation layer 2 in a spiral shape with a certain spiral gap to form a spiral conductive tape 4. Subsequently, solid paraffin is coated on the outside of the insulation layer 2 to form a heat storage layer 3, and the solid paraffin is distributed inside the spiral gap of the spiral conductive tape 4.
[0034] S3 also includes the following steps: S31. Carbon black granules and polyethylene are added to an extruder and heated to melt at a melting temperature of 160°C. The mixture is then extruded through the extruder onto the outside of the heat storage layer 3 to form an ultraviolet shielding layer 5.
[0035] Please see Figure 1 and Figure 2 An example of a UV-resistant and anti-aging PE water pipe: 1. 100 parts of high-density polyethylene, 6 parts of antioxidant 3,5-di-tert-butyl-4-hydroxybenzyl phosphate diethyl ester, 6 parts of ultraviolet absorber 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole and 6 parts of toughening agent maleic anhydride-grafted EPDM rubber are added to an extruder for melting at a melting temperature of 190°C, and then extruded through an extruder to form polyethylene layer 1; 2. Next, 45 parts of polyvinyl chloride plastic and 6 parts of foaming agent sodium bicarbonate are added to the extruder for melting, and then extruded through the extruder to form the heat insulation layer 2 on the outside of the polyethylene layer 1. Third, the thermally conductive silicone tape is then wound around the outside of the insulation layer 2 in a spiral form with a certain spiral gap to form a spiral heat conduction tape 4. Subsequently, solid paraffin is coated on the outside of the insulation layer 2 to form a heat storage layer 3, and the solid paraffin is distributed inside the spiral gap of the spiral heat conduction tape 4. 4. Add 50 parts of carbon black granules and 60 parts of polyethylene to an extruder and heat and melt them at a melting temperature of 160°C. Then, extrude them through the extruder to form an ultraviolet shielding layer 5 on the outside of the heat storage layer 3.
[0036] Please see Figure 1 and Figure 2 Example 2: A UV-resistant and anti-aging PE water pipe 1. 100 parts of high-density polyethylene, 6 parts of antioxidant 3,5-di-tert-butyl-4-hydroxybenzyl phosphate diethyl ester, 6 parts of ultraviolet absorber 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole and 6 parts of toughening agent maleic anhydride-grafted EPDM rubber are added to an extruder for melting at a melting temperature of 190°C, and then extruded through an extruder to form polyethylene layer 1; 2. Next, 45 parts of polyvinyl chloride plastic are added to the extruder for melting, and then extruded through the extruder to form a polyvinyl chloride layer on the outside of the polyethylene layer 1; Third, the thermally conductive silicone tape is then wound around the outside of the polyvinyl chloride layer in a spiral form with a certain spiral gap to form a spiral thermal conductive tape 4. Subsequently, solid paraffin is coated on the outside of the polyvinyl chloride layer to form a heat storage layer 3, and the solid paraffin is distributed inside the spiral gap of the spiral thermal conductive tape 4. 4. Add 50 parts of carbon black granules and 60 parts of polyethylene to an extruder and heat and melt them at a melting temperature of 160°C. Then, extrude them through the extruder to form an ultraviolet shielding layer 5 on the outside of the heat storage layer 3.
[0037] Please see Figure 1 and Figure 2 An example of a UV-resistant and anti-aging PE water pipe, Example 3: 1. 100 parts of high-density polyethylene, 6 parts of antioxidant 3,5-di-tert-butyl-4-hydroxybenzyl phosphate diethyl ester, 6 parts of ultraviolet absorber 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole and 6 parts of toughening agent maleic anhydride-grafted EPDM rubber are added to an extruder for melting at a melting temperature of 190°C, and then extruded through an extruder to form polyethylene layer 1; 2. Next, 45 parts of polyvinyl chloride plastic and 6 parts of foaming agent sodium bicarbonate are added to the extruder for melting, and then extruded through the extruder to form the heat insulation layer 2 on the outside of the polyethylene layer 1. Third, the thermally conductive silicone tape is then wound around the outside of the insulation layer 2 in a spiral pattern with a certain spiral gap to form a spiral thermally conductive tape 4; 4. Add 50 parts of carbon black granules and 60 parts of polyethylene to an extruder and heat and melt them at a melting temperature of 160°C. Then, extrude them through the extruder onto the outside of the spiral heat conduction tape 4 to form an ultraviolet shielding layer 5.
[0038] Please see Figure 1 and Figure 2 An example of a UV-resistant and anti-aging PE water pipe, Example 4: 1. 100 parts of high-density polyethylene, 6 parts of antioxidant 3,5-di-tert-butyl-4-hydroxybenzyl phosphate diethyl ester, 6 parts of ultraviolet absorber 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole and 6 parts of toughening agent maleic anhydride-grafted EPDM rubber are added to an extruder for melting at a melting temperature of 190°C, and then extruded through an extruder to form polyethylene layer 1; 2. Next, 45 parts of polyvinyl chloride plastic and 6 parts of foaming agent sodium bicarbonate are added to the extruder for melting, and then extruded through the extruder to form the heat insulation layer 2 on the outside of the polyethylene layer 1. Third, solid paraffin is then coated on the outside of the insulation layer 2 to form the heat storage layer 3; 4. Add 50 parts of carbon black granules and 60 parts of polyethylene to an extruder and heat and melt them at a melting temperature of 160°C. Then, extrude them through the extruder to form an ultraviolet shielding layer 5 on the outside of the heat storage layer 3.
[0039] Please see Figure 1 and Figure 2 An example of a UV-resistant and anti-aging PE water pipe, Example 5: 1. 100 parts of high-density polyethylene, 6 parts of antioxidant 3,5-di-tert-butyl-4-hydroxybenzyl phosphate diethyl ester, 6 parts of ultraviolet absorber 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole and 6 parts of toughening agent maleic anhydride-grafted EPDM rubber are added to an extruder for melting at a melting temperature of 190°C, and then extruded through an extruder to form polyethylene layer 1; 2. Next, 45 parts of polyvinyl chloride plastic and 6 parts of foaming agent sodium bicarbonate are added to the extruder for melting, and then extruded through the extruder to form the heat insulation layer 2 on the outside of the polyethylene layer 1. Third, the thermally conductive silicone tape is then wound around the outside of the insulation layer 2 in a spiral form with a certain spiral gap to form a spiral heat conduction tape 4. Subsequently, solid paraffin is coated on the outside of the insulation layer 2 to form a heat storage layer 3, and the solid paraffin is distributed inside the spiral gap of the spiral heat conduction tape 4. 4. Add 60 parts of polyethylene to an extruder and heat and melt it at a melting temperature of 160°C. Then, extrude it through the extruder to form an ultraviolet shielding layer 5 on the outside of the heat storage layer 3.
[0040] Please see Figure 1 and Figure 2 An example of a UV-resistant and anti-aging PE water pipe, Example 6: 1. 100 parts of high-density polyethylene, 6 parts of antioxidant 3,5-di-tert-butyl-4-hydroxybenzyl phosphate diethyl ester, 6 parts of ultraviolet absorber 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole and 6 parts of toughening agent maleic anhydride-grafted EPDM rubber are added to an extruder for melting at a melting temperature of 190°C, and then extruded through an extruder to form polyethylene layer 1; 2. Next, 45 parts of polyvinyl chloride plastic and 6 parts of foaming agent sodium bicarbonate are added to the extruder for melting, and then extruded through the extruder to form the heat insulation layer 2 on the outside of the polyethylene layer 1. 3. Add 50 parts of carbon black granules and 60 parts of polyethylene to an extruder and heat and melt them at a melting temperature of 160°C. Then, extrude them through the extruder to form an ultraviolet shielding layer 5 on the outside of the heat storage layer 3.
[0041] Please see Figure 1 and Figure 2 An anti-UV and anti-aging PE water pipe, Example 7: 1. 100 parts of high-density polyethylene, 6 parts of antioxidant 3,5-di-tert-butyl-4-hydroxybenzyl phosphate diethyl ester, 6 parts of ultraviolet absorber 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole and 6 parts of toughening agent maleic anhydride-grafted EPDM rubber are added to an extruder for melting at a melting temperature of 190°C, and then extruded through an extruder to form polyethylene layer 1; 2. Next, 45 parts of polyvinyl chloride plastic are added to the extruder for melting, and then extruded through the extruder to form a polyvinyl chloride layer on the outside of the polyethylene layer 1; 4. Add 50 parts of carbon black granules and 60 parts of polyethylene to an extruder and heat and melt them at a melting temperature of 160°C. Then, extrude them through the extruder to form an ultraviolet shielding layer 5 on the outside of the polyvinyl chloride layer.
[0042] Performance testing: 1. Temperature detection: The products of each embodiment are placed on the same substrate at the same time, and then baked at the same time by a baking lamp. After 30 minutes, the temperature of the internal polyethylene layer 1 of each embodiment is detected. 2. Ultraviolet penetration detection: The products of each embodiment are placed on the same substrate at the same time, and then the products of each embodiment are irradiated simultaneously with ultraviolet lamps. Then, the ultraviolet irradiance value inside the polyethylene layer 1 of each embodiment product is detected by using an ultraviolet spectroradiometer.
[0043] Test data of each embodiment under the same test conditions ; Experimental data shows that setting a carbon black-containing ultraviolet shielding layer 5 effectively blocks ultraviolet rays, thereby reducing the damage of external ultraviolet rays to the inner polyethylene layer 1 and slowing down the aging rate of the polyethylene layer 1. The heat insulation layer 2 effectively reduces the transfer of external temperature to the inner polyethylene layer 1, thus reducing the transfer of external light and heat to the polyethylene layer 1 and slowing down the aging rate of the polyethylene layer 1 due to temperature increases. The heat storage layer 3 absorbs some of the heat from the ultraviolet shielding layer 5, and the paraffin heat storage further reduces the rate of heat transfer to the inner polyethylene layer 1, thereby slowing down the rate of temperature increase in the polyethylene layer 1. Furthermore, the heat storage layer 3 absorbs… The heat from the ultraviolet shielding layer 5 can reduce the rate at which the ultraviolet shielding layer 5 heats up, thereby reducing the rate at which the ultraviolet shielding layer 5 deforms due to thermal expansion and contraction, reducing fatigue caused by excessive thermal expansion and contraction, and slowing down the aging rate of the ultraviolet shielding layer 5. By setting the spiral heat conduction tape 4, heat from one side of the ultraviolet shielding layer 5 can be quickly directed to the other side of the ultraviolet shielding layer 5. At the same time, heat from the local ultraviolet shielding layer 5 can be quickly transferred to other parts of the ultraviolet shielding layer 5 that are not exposed to sunlight, thereby further reducing the rate at which the ultraviolet shielding layer 5 heats up and slowing down the rate at which the ultraviolet shielding layer 5 ages.
[0044] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the rights involved.
Claims
1. A UV-resistant and anti-aging PE water pipe, characterized in that: The UV-resistant and anti-aging PE water pipe comprises, from the inside out, a polyethylene layer (1), a heat insulation layer (2), a heat storage layer (3), a spiral heat conduction layer (4), and a UV shielding layer (5). The heat insulation layer (2) is located on the outside of the polyethylene layer (1), the heat storage layer (3) is located on the outside of the heat insulation layer (2), the spiral heat conduction layer (4) is located on the outside of the heat insulation layer (2) in a spiral winding manner, and the spiral heat conduction layer (4) is immersed in the interior of the heat storage layer (3). The UV shielding layer (5) is located on the outside of the heat storage layer (3).
2. The UV-resistant and anti-aging PE water pipe according to claim 1, characterized in that: The polyethylene layer (1) comprises, by weight, 90-100 parts high-density polyethylene, 5-10 parts antioxidant, 5-10 parts ultraviolet absorber and 5-10 parts toughening agent.
3. The UV-resistant and anti-aging PE water pipe according to claim 2, characterized in that: The antioxidant is one of 3,5-di-tert-butyl-4-hydroxybenzyl phosphate diethyl ester, 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanurate and pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].
4. The UV-resistant and anti-aging PE water pipe according to claim 2, characterized in that: The ultraviolet absorber is one of 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-di-tert-pentylphenyl)benzotriazole, and 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole.
5. The UV-resistant and anti-aging PE water pipe according to claim 2, characterized in that: The toughening agent is one of maleic anhydride-grafted EPDM rubber and ethylene-octene copolymer.
6. The UV-resistant and anti-aging PE water pipe according to claim 1, characterized in that: The heat insulation layer (2) comprises 40-50 parts plastic and 4-8 parts foaming agent by weight. The plastic is either polyethylene or polyvinyl chloride, and the foaming agent is either sodium bicarbonate or ammonium bicarbonate.
7. The UV-resistant and anti-aging PE water pipe according to claim 1, characterized in that: The heat storage layer (3) is made of paraffin wax, and the spiral heat conduction tape (4) is made of thermally conductive silicone.
8. The UV-resistant and anti-aging PE water pipe according to claim 1, characterized in that: The ultraviolet shielding layer (5) comprises 40-60 parts by weight of carbon black particles and 50-70 parts by weight of polyethylene.
9. The manufacturing process of an anti-ultraviolet and anti-aging PE water pipe according to any one of claims 1-8, characterized in that: The manufacturing process of the UV-resistant and anti-aging PE water pipe includes the following steps: S1. High-density polyethylene, antioxidant, ultraviolet absorber and toughening agent are added to an extruder for melting at a melting temperature of 190°C, and then extruded through the extruder to form a polyethylene layer (1). S2. Next, the plastic and foaming agent are added to the extruder for melting, and then extruded through the extruder to form a heat insulation layer (2) on the outside of the polyethylene layer (1). S3. Then, the thermal conductive silicone tape is wound around the outside of the insulation layer (2) in a spiral form with a certain spiral gap to form a spiral conductive tape (4). Subsequently, solid paraffin is coated on the outside of the insulation layer (2) to form a heat storage layer (3), and the solid paraffin is distributed inside the spiral gap of the spiral conductive tape (4).
10. The manufacturing process of an anti-ultraviolet and anti-aging PE water pipe according to claim 9, characterized in that: The S3 further includes the following steps: S31. Carbon black particles and polyethylene are added to an extruder and heated to melt at a melting temperature of 160°C. Then, they are extruded through the extruder to form an ultraviolet shielding layer (5) on the outside of the heat storage layer (3).