WO2022047814A1 - 一种过氧化物交联聚乙烯PEX-a管道 - Google Patents

一种过氧化物交联聚乙烯PEX-a管道 Download PDF

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Publication number
WO2022047814A1
WO2022047814A1 PCT/CN2020/114110 CN2020114110W WO2022047814A1 WO 2022047814 A1 WO2022047814 A1 WO 2022047814A1 CN 2020114110 W CN2020114110 W CN 2020114110W WO 2022047814 A1 WO2022047814 A1 WO 2022047814A1
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pex
layer
pipeline
antibacterial
peroxide
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PCT/CN2020/114110
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English (en)
French (fr)
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汪磊
许国智
郑志强
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日丰企业集团有限公司
日丰企业（佛山）有限公司
日丰科技有限公司
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Publication of WO2022047814A1 publication Critical patent/WO2022047814A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/12—Rigid pipes of plastics with or without reinforcement
    • F16L9/121—Rigid pipes of plastics with or without reinforcement with three layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B32B1/08—Tubular products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/26—Layered products comprising a layer of synthetic resin characterised by the use of special additives using curing agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F10/00—Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • C08F10/02—Ethene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/03—3 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B32B2250/242—All polymers belonging to those covered by group B32B27/32
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/71—Resistive to light or to UV
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2597/00—Tubular articles, e.g. hoses, pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L2201/00—Special arrangements for pipe couplings
    • F16L2201/40—Special arrangements for pipe couplings for special environments
    • F16L2201/44—Special arrangements for pipe couplings for special environments sterile
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/20—Controlling water pollution; Waste water treatment

Definitions

  • the utility model relates to the technical field of pipes, in particular to a peroxide cross-linked polyethylene PEX-a pipe.
  • PEX is formed by cross-linking of polyethylene (PE).
  • PEX-a is formed by cross-linking PE by peroxide method.
  • the cross-linking process increases a large number of chemical bonds between PE molecules, so the relative displacement freedom of the molecules is greatly reduced.
  • the high temperature resistance, low temperature impact strength, wear resistance, environmental stress crack resistance, chemical corrosion resistance and tensile strength of PEX are greatly improved.
  • PEX pipes have a series of excellent properties, in practical applications, residual chlorine in water, outdoor light, oxygen infiltration, etc. will greatly shorten the service life of PEX pipes. How to ensure the long-term service life of pipes in these special application environments is the focus of plastic pipe enterprises. In addition, plastic pipes have weaker antibacterial ability than metal pipes, which are easy to breed bacteria and affect water quality. Therefore, the utility model aims to invent a new type of peroxide cross-linked polyethylene PEX-a pipeline, which can enhance the anti-aging performance of the PEX-a pipeline, prolong its service life, inhibit the growth and reproduction of bacteria in the water in the pipeline, and improve the drinking water quality.
  • the purpose of the utility model is to overcome the shortcomings of the prior art and provide a peroxide cross-linked polyethylene PEX-a pipeline, the PEX-a pipeline has long-term reliable pressure resistance, anti-aging performance and antibacterial performance.
  • a peroxide cross-linked polyethylene PEX-a pipe is sequentially bonded with a PEX-a antibacterial layer, a PEX-a main body layer and an anti-UV layer from the inside to the outside.
  • the outer layer of the PEX-a pipeline is an anti-UV layer, which is beneficial to enhance the weather resistance of the pipeline, enhance the anti-aging performance of the pipeline, and prolong the service life;
  • the inner layer of the pipeline is set as a PEX-a antibacterial layer, which can inhibit the bacteria in the water in the pipeline. grow and reproduce, and improve drinking water quality.
  • the wall thickness ratio of the PEX-a antibacterial layer, the PEX-a main layer and the anti-UV layer is (1-3): (9-11): (0.5-1), by controlling the ratio of each layer of the pipe , which can ensure that the PEX-a pipeline has a longer and reliable pressure resistance and anti-aging performance, and can also ensure that the inner layer in contact with water has better antibacterial performance, improving drinking water quality.
  • the material of the PEX-a antibacterial layer is PEX-a and an antibacterial agent.
  • the antibacterial agent can be selected from conventional antibacterial agents, such as inorganic antibacterial agents, organic antibacterial agents and the like.
  • the material of the PEX-a main layer is PEX-a.
  • the materials of the anti-UV layer are PE, anti-UV auxiliary agent and antioxidant.
  • the antioxidant of the present invention can be selected from hindered phenol antioxidants, phosphite antioxidants, thioether antioxidants and the like.
  • the peroxide cross-linked polyethylene PEX-a pipeline of the present invention is sequentially bonded with a PEX-a antibacterial layer, a PEX-a main body layer and an anti-UV layer from the inside to the outside, wherein the anti-UV layer can enhance the weather resistance of the pipeline.
  • the anti-aging performance of the pipeline is enhanced and the service life is prolonged; the PEX-a antibacterial layer can inhibit the growth and reproduction of bacteria in the water in the pipeline, and improve the quality of drinking water.
  • Figure 1 is a schematic diagram of the structure of the peroxide cross-linked polyethylene PEX-a pipes of Examples 1-3 and Comparative Example 1, 1-PEX-a antibacterial layer, 2-PEX-a main layer and 3-Anti-UV layer.
  • Figure 2 is a schematic diagram of the structure of the peroxide cross-linked polyethylene PEX-a pipe of Comparative Example 2, 4-antibacterial layer and 5-protective layer.
  • the experimental methods used are conventional methods unless otherwise specified, and the materials, reagents, etc. used can be obtained from commercial sources unless otherwise specified.
  • the peroxide cross-linked polyethylene PEX-a pipe of this embodiment is sequentially bonded with a PEX-a antibacterial layer 1, a PEX-a main body layer 2 and an anti-UV layer 3 from the inside to the outside, and
  • the wall thickness ratio of the PEX-a antibacterial layer 1, the PEX-a main body layer 2 and the anti-UV layer 3 is 1:9:0.5.
  • the material of the PEX-a antibacterial layer 1 is PEX-a and antibacterial agent; the material of the PEX-a main layer 2 is PEX-a; the material of the anti-UV layer 3 is PE, anti-UV auxiliary agent and antioxidants.
  • the peroxide cross-linked polyethylene PEX-a pipe of this embodiment is sequentially bonded with a PEX-a antibacterial layer 1, a PEX-a main body layer 2 and an anti-UV layer 3 from the inside to the outside, and
  • the wall thickness ratio of the PEX-a antibacterial layer 1, the PEX-a main body layer 2 and the anti-UV layer 3 is 2:10:1.
  • the material of the PEX-a antibacterial layer 1 is PEX-a and antibacterial agent; the material of the PEX-a main layer 2 is PEX-a; the material of the anti-UV layer 3 is PE, anti-UV auxiliary agent and antioxidants.
  • the peroxide cross-linked polyethylene PEX-a pipe of this embodiment is sequentially bonded with a PEX-a antibacterial layer 1, a PEX-a main body layer 2 and an anti-UV layer 3 from the inside to the outside, and
  • the wall thickness ratio of the PEX-a antibacterial layer 1, the PEX-a main body layer 2 and the anti-UV layer 3 is 3:11:1.
  • the material of the PEX-a antibacterial layer 1 is PEX-a and antibacterial agent; the material of the PEX-a main layer 2 is PEX-a; the material of the anti-UV layer 3 is PE, anti-UV auxiliary agent and antioxidants.
  • the peroxide cross-linked polyethylene PEX-a pipe of this embodiment is sequentially bonded with a PEX-a antibacterial layer 1, a PEX-a main body layer 2 and an anti-UV layer 3 from the inside to the outside, and
  • the wall thickness ratio of the PEX-a antibacterial layer 1, the PEX-a main body layer 2 and the anti-UV layer 3 is 1:12:1.
  • the material of the PEX-a antibacterial layer 1 is PEX-a and antibacterial agent; the material of the PEX-a main layer 2 is PEX-a; the material of the anti-UV layer 3 is PE, anti-UV auxiliary agent and antioxidants.
  • the peroxide cross-linked polyethylene PEX-a pipeline of this embodiment includes an antibacterial layer 4 and a protective layer 5 in turn from the inside to the outside, and the antibacterial layer 4 and the protective layer 5 are bonded on the Together, the materials of the antibacterial layer 4 are PEX-a and antibacterial agents; the materials of the protective layer 5 are PEX-a and antioxidants, and the wall thickness ratio of the antibacterial layer 4 and the protective layer 5 is 1:9 .
  • the PEX-a antibacterial layer is added in the PEX-a main layer, and the anti-UV layer can enhance the weather resistance of the pipeline, enhance the anti-aging performance of the pipeline, and prolong the service life;
  • An anti-UV layer is added outside.
  • the anti-UV layer can enhance the weather resistance of the pipeline, enhance the anti-aging performance of the pipeline and prolong the service life.
  • the antibacterial performance and anti-aging performance of the pipe can be adjusted accordingly, especially when the PEX-a antibacterial layer, PEX-a
  • the wall thickness ratio of the main layer and the anti-UV layer is (1-3): (9-11): (0.5-1), which can ensure that the PEX-a pipeline has both better anti-aging performance and antibacterial performance.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Medicinal Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Laminated Bodies (AREA)
  • Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

本实用新型公开了一种过氧化物交联聚乙烯PEX-a管道。本实用新型的过氧化物交联聚乙烯PEX-a管道，由内到外依次粘结有PEX-a抗菌层、PEX-a主体层和抗UV层，通过在PEX-a主体层外设抗UV层，能够增强管道的耐候性，使管道抗老化性能增强，使用寿命延长；在PEX-a主体层内设PEX-a抗菌层，可以抑制管道中水中细菌的生长和繁殖，并提高饮用水水质。

Description

一种过氧化物交联聚乙烯PEX-a管道 技术领域
本实用新型涉及管材技术领域，具体涉及一种过氧化物交联聚乙烯PEX-a管道。
背景技术
PEX由聚乙烯(PE)交联形成，其中，PEX-a由PE采用过氧化物法交联形成得到，交联过程使PE分子间增加了大量的化学键，因而分子的相对位移自由度大大降低，PEX的耐高温能力、低温冲击强度、耐磨性、耐环境应力开裂性、耐化学腐蚀性以及拉伸强度等性能相较于PE均大幅提升。
虽然PEX管具有一系列优良性能，但在实际应用中，水中残余氯、户外光照、氧气渗入等均会大幅度缩短PEX管的使用寿命。如何在这些特殊应用环境下仍然保证管材长期使用寿命是塑料管道企业关注的热点。此外，塑料管道因其抗菌能力较金属管道弱，容易滋生细菌，影响水质。因此，本实用新型旨在发明一种新型过氧化物交联聚乙烯PEX-a管道，增强PEX-a管道的抗老化性能，延长其使用寿命，抑制管道中水中细菌的生长和繁殖，并提高饮用水水质。
实用新型内容
本实用新型的目的在于克服现有技术的不足之处而提供一种过氧化物交联聚乙烯PEX-a管道，该PEX-a管道具有长久可靠的耐压抗老化性能和抑菌性能。
为实现上述目的，本实用新型采取的技术方案如下：
一种过氧化物交联聚乙烯PEX-a管道，由内到外依次粘结有PEX-a抗菌层、PEX-a主体层和抗UV层。该PEX-a管道的外层为抗UV层，有利于增强管道的耐候性，使管道抗老化性能增强，使用寿命延长；管道的内层设为PEX-a抗菌层可以抑制管道中水中细菌的生长和繁殖，并提高饮用水水质。
进一步地，所述PEX-a抗菌层、PEX-a主体层和抗UV层的壁厚比为(1～3)：(9～11)：(0.5～1)，通过控制管材各层的比例，可保证该PEX-a管道具有更长久可靠的耐压抗老化性能，也可以保证其与水接触的内层具有更优良的抑菌性能，提高饮用水水质。
进一步地，所述PEX-a抗菌层的材料为PEX-a和抗菌剂。所述抗菌剂可选用常规的抗菌剂，如无机抗菌剂、有机抗菌剂等。
进一步地，所述PEX-a主体层的材料为PEX-a。
进一步地，所述抗UV层的材料为PE、抗UV助剂和抗氧剂。本实用新型的抗氧剂可选用受阻酚类抗氧剂、亚磷酸酯类抗氧剂、硫醚类抗氧剂等。
与现有技术相比，本实用新型的有益效果为：
本实用新型的过氧化物交联聚乙烯PEX-a管道，由内到外依次粘结有PEX-a抗菌层、PEX-a主体层和抗UV层，其中，抗UV层能够增强管道的耐候性，使管道抗老化性能增强，使用寿命延长；PEX-a抗菌层可以抑制管道中水中细菌的生长和繁殖，并提高饮用水水质。
附图说明
图1为实施例1-3和对比例1的过氧化物交联聚乙烯PEX-a管道的结构示意图，1-PEX-a抗菌层、2-PEX-a主体层和3-抗UV层。
图2为对比例2的过氧化物交联聚乙烯PEX-a管道的结构示意图，4-抗菌层和5-保护层。
具体实施方式
为更好地说明本实用新型的目的、技术方案和优点，下面将结合具体实施例对本实用新型进一步说明。本领域技术人员应当理解，此处所描述的具体实施例仅用以解释本实用新型，并不用于限定本实用新型。
实施例中，所使用的实验方法如无特殊说明，均为常规方法，所用的材料、试剂等，如无特殊说明，均可从商业途径得到。
实施例1
本实施例的过氧化物交联聚乙烯PEX-a管道，如图1所示，由内到外依次粘结有PEX-a抗菌层1、PEX-a主体层2和抗UV层3，且PEX-a抗菌层1、PEX-a主体层2和抗UV层3的壁厚比为1：9：0.5。
其中，所述PEX-a抗菌层1的材料为PEX-a和抗菌剂；所述PEX-a主体层2的材料为PEX-a；所述抗UV层3的材料为PE、抗UV助剂和抗氧剂。
实施例2
本实施例的过氧化物交联聚乙烯PEX-a管道，如图1所示，由内到外依次 粘结有PEX-a抗菌层1、PEX-a主体层2和抗UV层3，且PEX-a抗菌层1、PEX-a主体层2和抗UV层3的壁厚比为2：10：1。
其中，所述PEX-a抗菌层1的材料为PEX-a和抗菌剂；所述PEX-a主体层2的材料为PEX-a；所述抗UV层3的材料为PE、抗UV助剂和抗氧剂。
实施例3
本实施例的过氧化物交联聚乙烯PEX-a管道，如图1所示，由内到外依次粘结有PEX-a抗菌层1、PEX-a主体层2和抗UV层3，且PEX-a抗菌层1、PEX-a主体层2和抗UV层3的壁厚比为3：11：1。
其中，所述PEX-a抗菌层1的材料为PEX-a和抗菌剂；所述PEX-a主体层2的材料为PEX-a；所述抗UV层3的材料为PE、抗UV助剂和抗氧剂。
对比例1
本实施例的过氧化物交联聚乙烯PEX-a管道，如图1所示，由内到外依次粘结有PEX-a抗菌层1、PEX-a主体层2和抗UV层3，且PEX-a抗菌层1、PEX-a主体层2和抗UV层3的壁厚比为1：12：1。
其中，所述PEX-a抗菌层1的材料为PEX-a和抗菌剂；所述PEX-a主体层2的材料为PEX-a；所述抗UV层3的材料为PE、抗UV助剂和抗氧剂。
对比例2
本实施例的过氧化物交联聚乙烯PEX-a管道，如图2所示，由内到外依次包括抗菌层4和保护层5，抗菌层4和保护层5通过粘结剂粘结在一起，其中，所述抗菌层4的材料为PEX-a和抗菌剂；所述保护层5的材料为PEX-a和抗氧剂，抗菌层4和保护层5的壁厚比为1：9。
对以上实施例和对比例的管材进行抗菌性能与耐候性能测试，其中抗菌性能根据JC/T 939-2004进行实验得到样品对应的抗菌率；耐候性能是根据GB/T 16422.3进行暴露循环后，检测样品的断裂伸长率。具体检测结果如表1所示。
表1
组别 抗菌率 断裂伸长率
实施例1 99.99％ 395％
实施例2 99.99％ 529％
实施例3 99.99％ 476％
对比例1 99.0％ 466％
对比例2 99.9％ 320％
由上述结果可知，本实用新型通过在PEX-a主体层内增设PEX-a抗菌层，抗UV层能够增强管道的耐候性，使管道抗老化性能增强，使用寿命延长；在PEX-a主体层外增设抗UV层，抗UV层能够增强管道的耐候性，使管道抗老化性能增强，使用寿命延长。并且，本实用新型通过控制PEX-a抗菌层、PEX-a主体层和抗UV层的壁厚比，可相应调整管材的抗菌性能和抗老化性能，尤其当PEX-a抗菌层、PEX-a主体层和抗UV层的壁厚比为(1～3)：(9～11)：(0.5～1)，可保证该PEX-a管道兼具更好的抗老化性能和抑菌性能。
最后所应当说明的是，以上实施例仅用以说明本实用新型的技术方案而非对本实用新型保护范围的限制，尽管参照较佳实施例对本实用新型作了详细说明，本领域的普通技术人员应当理解，可以对本实用新型的技术方案进行修改或者等同替换，而不脱离本实用新型技术方案的实质和范围。

Claims (5)

  1. 一种过氧化物交联聚乙烯PEX-a管道，其特征在于，由内到外依次粘结有PEX-a抗菌层、PEX-a主体层和抗UV层。
  2. 根据权利要求1所述的过氧化物交联聚乙烯PEX-a管道，其特征在于，所述PEX-a抗菌层、PEX-a主体层和抗UV层的壁厚比为(1～3)：(9～11)：(0.5～1)。
  3. 根据权利要求1所述的过氧化物交联聚乙烯PEX-a管道，其特征在于，所述PEX-a抗菌层的材料为PEX-a和抗菌剂。
  4. 根据权利要求1所述的过氧化物交联聚乙烯PEX-a管道，其特征在于，所述PEX-a主体层的材料为PEX-a。
  5. 根据权利要求1-4任一项所述的过氧化物交联聚乙烯PEX-a管道，其特征在于，所述抗UV层的材料为PE、抗UV助剂和抗氧剂。
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