WO2022095309A1 - 一种复合材料熔焊管材 - Google Patents

一种复合材料熔焊管材 Download PDF

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WO2022095309A1
WO2022095309A1 PCT/CN2021/077758 CN2021077758W WO2022095309A1 WO 2022095309 A1 WO2022095309 A1 WO 2022095309A1 CN 2021077758 W CN2021077758 W CN 2021077758W WO 2022095309 A1 WO2022095309 A1 WO 2022095309A1
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pipe
present
fusion
type
pipes
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PCT/CN2021/077758
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French (fr)
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马修
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维华尼国际有限公司
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/08—Copolymers of ethene
    • C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
    • C08L23/0815—Copolymers of ethene with aliphatic 1-olefins
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/18—Applications used for pipes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure

Definitions

  • the invention belongs to the technical field of fusion-welded pipe material modification, and particularly relates to a fusion-welded pipe material of composite materials.
  • PE pipes polyethylene pipes
  • PPR pipes polypropylene pipes
  • PE pipes have disadvantages such as poor heat resistance and low compressive strength, so they can only be used for low-pressure and small-diameter pipes.
  • PE plastics are very sensitive to environmental stress (chemical and mechanical effects) and are prone to stress cracking;
  • PPR pipe has shortcomings such as insufficient rigidity at high temperature, brittleness at low temperature, low environmental resistance, low continuous use temperature, large creep performance, and inability to withstand long-term load, which are embodied in:
  • the thermal expansion coefficient is large at high temperature, and the pipe is deformed and bent;
  • the remedy is to wrap a layer of sunscreen on the white PPR tube body to protect against strong ultraviolet rays.
  • the present invention provides a composite fusion-welded pipe with low cost, high environmental resistance and high compressive strength.
  • the utility model relates to a fusion welded pipe material of composite material, which is formed by composite co-extrusion of type II PE-RT and LLDPE materials, and its mass percentage is 56-98% of type II PE-RT and 2-44% of LLDPE.
  • the type II PE-RT material is a bimodal molecular weight distribution structure with low sag characteristics.
  • type II PE-RT is formed by copolymerizing polyethylene, ethylene and butene.
  • LLDPE is formed by copolymerizing ethylene and a-olefin under low temperature and pressure conditions.
  • the ⁇ -olefin is one of butene, hexene or octene.
  • the maximum diameter of the pipe is 500 mm.
  • the composite fusion-welded pipe of the present invention has good flexibility, making it convenient and economical to lay, and the produced pipe can be coiled and bent during construction to reduce the usage of pipe fittings and reduce construction costs.
  • the composite material fusion-welded pipe of the present invention has excellent low temperature resistance performance, so it can be constructed even in the case of low temperature in winter, and the pipe does not need to be preheated during bending.
  • the composite material fusion-welded pipe of the present invention has good chemical corrosion resistance and long service life.
  • the composite material fusion-welded pipe of the present invention has good environmental adaptability, light weight, good flexibility, and can be supplied in coils.
  • the composite material fusion-welded pipe of the present invention can be used safely for more than 50 years under the conditions of a working temperature of 70° C. and a pressure of 0.4 MPa.
  • the inner wall is smooth, non-scaling, and does not breed bacteria, which can be safely used in drinking water transportation and other fields.
  • This embodiment discloses a composite material fusion-welded pipe, which is formed by composite co-extrusion of type II PE-RT and LLDPE materials, and its mass percentage is: 56-98% type II PE-RT, 2-44% LLDPE , wherein the compounding method of type II PE-RT and LLDPE materials can be any type of mixing machine or manual compounding method, which can achieve the technical effect of the present invention.
  • the type II PE-RT material has a bimodal molecular weight distribution structure with low sag, and is currently the only raw material for large-diameter plastic pipes that can be extruded for hot water transportation.
  • the raw material has the processing characteristics of low sag, and the maximum diameter of the pipe can be produced to 500mm, which fully meets the requirements of large flow in heat transportation.
  • Type II PE-RT is copolymerized by polyethylene, ethylene and butene.
  • LLDPE is formed by copolymerizing ethylene and a-olefin under low temperature and pressure conditions, wherein the a-olefin is one of butene, hexene or octene.
  • the pipe of the present invention exhibits higher compression resistance and higher impact resistance under the same wall thickness and diameter under the same pressure and temperature conditions (cold weather of -20°C). In the middle), it can solve the problem of pipeline cracks caused by impact, and at the same time, the pipe of the present invention has high flexibility and can be supplied in coils, because the length of coils can reduce the reason for using joint fittings, and there is no need to use the middle of the installation. Fittings are used to connect pipes, making installation faster and reducing the risk of leakage.
  • the pipes of the present invention can replace PPR pipes, PE pipes and PE-RT pipes, while improving the weak points of these pipes.
  • the pipe in this example is produced in the following way: adding type II PE-RT and LLDPE materials into an internal mixer according to mass percentage and mixing evenly, then extruding through an extruder, and then shaping by a shaping machine, wherein the extrusion
  • the extrusion process temperature of the machine is carried out under the condition of 170-190 °C, and the setting machine is water-cooled. (The corresponding production process parameters can be modified according to the actual production situation here)
  • the pipe material of the present invention After the pipe material of the present invention is modified, all properties are optimized and improved, so that the pipe material can use a pipe material with a smaller diameter and wall thickness under the same use requirements, so as to achieve the effect of saving materials and costs, and at the same time
  • the weight of the pipe becomes lighter, and combined with the delivery method of the coil, the pipe of the present invention is easy to transport and install; at the same time, the pipe of the present invention has excellent flexibility, so that the pipe can be coiled and bent, thereby reducing the use of connecting fittings , reducing installation costs.
  • the pipe of the present invention Since the pipe of the present invention is flexible and easy to shape, it has the property of memory to keep straight, unlike PE pipe, PPR pipe or PE-RT pipe which are prone to curl, which makes the pipe of the present invention easier to install.
  • the pipe material of the present invention has very high resistance to stress and cracking.
  • the thermal expansion coefficient of the pipe material of the present invention is 0.2 mm/mK, and the elastic modulus is 550 mm 2 /N. Therefore, when the pipe is bent, the stress of the bending part will be released rapidly, With the support of this performance, the pipe of the present invention can be quickly laid on a large-area site, and the installation is simple even when the temperature is below zero.
  • the pipe of the present invention has a low brittle fracture temperature, it has a wider working temperature range and can work normally within the range of -40°C to 95°C.
  • the pipe of the present invention is still flexible under the environment of lower than -40°C.
  • the pipe material of the present invention has good chemical corrosion resistance and long service life, and under normal conditions, the pipe can be used safely for 50 years; the pipe material of the present invention is not easy to be broken, and through tests, the pipe material of the present invention is at -30 °C, its The notched impact strength reaches 13KJ/m 2 , which can still be protected from impact and maintain normal working condition at a low temperature of -40°C, while the PPR pipe will be damaged at a low temperature below -20°C.
  • the pipe of the present invention has the same socket welding capability as PPR, and the performance is as reliable as PPR, while the socket welding performance of PE-RT is unreliable.
  • the present invention uses the coil supply method and can be flexibly bent, and the corners do not need to use elbows. Use many joints to effectively reduce installation costs. Since much less elbows are used, a smaller diameter can be used for most pipes, such as the original 25mm pipe, which can be replaced by 20mm in the present invention. Because elbows create flow resistance, reducing flow, and reducing the use of elbows means increased flow.
  • the present invention reduces the material cost.
  • the material cost can be reduced by 15% because the present invention requires less accessories.
  • the present invention reduces the labor cost.
  • the present invention saves the installation of a lot of joint fittings during the installation process, simplifies the installation process, and greatly improves the efficiency of the pipe installation. Therefore, the present invention can reduce the labor cost of installation. 35%.
  • the product of the invention has good flexibility and can be connected in various connection modes, so that the product is more convenient and time-saving in construction.
  • PPR pipes are usually shipped in units of 4 meters.
  • the pipes of the present invention are supplied in coils, usually in the form of a 20mm diameter roll of 100 meters, a 25mm diameter roll of 80 meters, and a 32mm diameter roll of 60 meters long, which is more convenient for transportation and loading and saves space. During installation, there is less chance of pipeline leakage due to fewer joints.
  • the composite material fusion welded pipe material of the present invention can be applied in the following aspects:
  • Heating systems in buildings including floors, siding and radiant heating systems
  • Industrial pipeline systems such as transporting or discharging chemical media.
  • the temperature of the industrial transport medium in the industrial transport system for industrial pipes is relatively high and generally corrosive.
  • the transport pipeline system is required to have good high temperature resistance and corrosion resistance.
  • Pipeline system is required to have good high temperature resistance and corrosion resistance.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

本发明公开了一种复合材料熔焊管材，由Ⅱ型PE-RT和LLDPE材料复合共挤而成，其质量百分比为：56～98％的Ⅱ型PE-RT，2～44％的LLDPE，本发明的复合材料熔焊管材具有良好的柔韧性，使其铺设时方便经济，生产的管材在施工时可以通过盘卷和弯曲等方法减少管件的使用量，降低施工成本，此外还具有优越的耐低温性能，因此在冬季低温的情况下也可以施工，并且在弯曲时管道无需预热。

Description

一种复合材料熔焊管材 技术领域
本发明属于熔焊管材改性技术领域，具体涉及一种复合材料熔焊管材。
背景技术
管材在我们日常生活、工程建设以及工业输送等领域中均有广泛的应用，其中常见的管材包括有PE管(聚乙烯管)和PPR管(聚丙烯管)两种，在实际使用中，发现PE管存在耐热性差，抗压耐压强度较低等缺点，所以只能用于低压力小直径的管材，PE塑料对于环境应力(化学与机械作用)是很敏感的，易应力开裂；而PPR管则存在高温刚性不足，而低温发脆，耐环境能力低，连续使用温度低，蠕变性能大，不耐长期载荷等缺点，具体体现在：
1、耐压性差，在遇到相同的压力时，金属质地管材会体现出更大的韧性，而PPR管材可能会出现破损的现象，导致无法正常使用；
2、耐热性弱，通常PPR管材的长期工作温度是不能超过70℃的，否则会降低PPR管材的使用寿命；
3、高温时热膨胀系数较大，管材变形弯曲；
4、低温冲击性能差，达不到实际使用要求；
5、配件价格高，每段PPR管材的长度都有一定的限制，在施工距离较长的情况下需要大量的接头将PPR管材接驳起来，但是，相比于PPR管材的价廉，PPR管材施工中经常用到的接头却是价格 较高的产品；
6、不抗冻，安装了PPR管材，在中国南方或许还不用防冻，但在冬季温度动不动-10℃以下的北方地区，就需要对PPR管材做好防冻保护措施，在水管外包裹保温棉；
7、不耐晒，尤其在太阳光强烈的夏季，经过一两个夏天的暴晒，白色的PPR管材就会发黄，甚至内壁结水垢，污染水质。补救措施就是，在白色PPR管管身，包裹一层防晒层，抵御强烈的紫外线。
因此需要研发一种复合材料熔焊管材来同时解决以上问题。
发明内容
为了克服现有技术的不足，本发明提供一种低成本、耐环境能力高、抗压耐压强度高的复合材料熔焊管材。
本发明解决其技术问题所采用的技术方案是：
一种复合材料熔焊管材，由Ⅱ型PE-RT和LLDPE材料复合共挤而成，其质量百分比为：56～98％的Ⅱ型PE-RT，2～44％的LLDPE。
在本发明中，所述Ⅱ型PE-RT材料为具有低熔垂特性的双峰分子量分布结构。
在本发明中，Ⅱ型PE-RT由聚乙烯、乙烯和丁烯共聚而成。
在本发明中，LLDPE由乙烯和a-烯烃在低温和压力条件下共聚而成。
在本发明中，所述a-烯烃为丁烯、己烯或辛烯中的其中一种。
在本发明中，管材最大口径为500mm。
本发明的有益效果是：
1、本发明的复合材料熔焊管材具有良好的柔韧性，使其铺设时方便经济，生产的管材在施工时可以通过盘卷和弯曲等方法减少管件的使用量，降低施工成本。
2、本发明的复合材料熔焊管材具有优越的耐低温性能，因此在冬季低温的情况下也可以施工，并且在弯曲时管道无需预热。
3、本发明的复合材料熔焊管材具有良好的抗化学腐蚀性能，使用寿命长。
4、本发明的复合材料熔焊管材具有良好的环境适应性，重量轻，柔韧性好，可盘管供货。
5、本发明的复合材料熔焊管材在工作温度为70℃，压力为0.4MPa条件下，可安全使用50年以上。
6、管材在生产过程中不添加任何有毒助剂。内壁光滑，不结垢，不滋生细菌，可以安全应用在饮用水输送等领域。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述。
实施例：
本实施例公开了一种复合材料熔焊管材，由Ⅱ型PE-RT和LLDPE材料复合共挤而成，其质量百分比为：56～98％的Ⅱ型PE-RT，2～44％的LLDPE，其中Ⅱ型PE-RT和LLDPE材料的复合方法可以是任何类型的混合机器或手动的复合方法，均可以达到本 发明的技术效果。所述Ⅱ型PE-RT材料为具有低熔垂特性的双峰分子量分布结构，是目前唯一可以挤出生产用于热水输送的大口径塑料管道原料。原材料具有低熔垂的加工特性，管材最大口径可生产至500mm，完全满足热力输送中大流量的要求。Ⅱ型PE-RT由聚乙烯、乙烯和丁烯共聚而成。LLDPE由乙烯和a-烯烃在低温和压力条件下共聚而成，其中所述a-烯烃为丁烯、己烯或辛烯中的其中一种。本发明通过将Ⅱ型PE-RT和LLDPE材料进行共混改性，所制得的共混改性材料兼具两者的特有性能，大大提高管材的柔韧性与耐环境能力，抗压耐压强度，扩大应用范围，加强与其它熔焊管材如PE管，PPR管，PE-RT管等的市场竞争，并降低产品的生产与安装成本。经检测，本发明的管材在具有相同的壁厚和直径的情况下；呈现出更高的抗压性及呈现更高的抗冲击性，在相同的压力和温度条件(-20℃的寒冷天气中)下，能解决因冲击而导致的管道裂缝问题，同时本发明的管材柔韧性较高，可以盘卷供货，因为盘卷米数长可以减少使用接头配件的原因，安装时中间无需使用接头配件进行管材连接，安装更快捷，也减少泄漏风险，。本发明的管材可取代PPR管、PE管及PE-RT管，同时改善这些管的弱点。
本实施例的管材采用以下方式生产：将Ⅱ型PE-RT和LLDPE材料按质量百分比添加到密炼机中混炼均匀，然后通过挤出机挤出成型，再经过定型机定型，其中挤出机的挤出工艺温度为170～190℃的条件下进行，定型机为水冷定型。(此处可以按照实际生产情况进行对应生产工艺参数的修改)
本发明的管材通过改性后，各项性能均得到优化提升，从而使管材在相同的使用要求的条件下，可以使用更小管径和壁厚的管材，达到节约材料和成本的效果，同时管材的重量变轻，结合盘卷交货的方式，使本发明的管材易于运输和安装；同时本发明的管材具有出色的柔韧性，使管材能够盘卷和弯曲，从而减少了连接配件的使用，降低了安装成本。由于本发明的管材是灵活和容易塑造的，有记忆保持直线的性能，而不像PE管、PPR管或PE-RT管这些管材容易卷曲，这使得本发明的管材更容易安装。此外本发明管材具有非常高的抗应力与抗开裂能力，本发明管材的热膨胀系数为0.2mm/mK，弹性模量为550mm 2/N，因此当管道弯曲时，弯曲部分的应力会迅速释放，在此性能的支持下，本发明管材进行大面积场地的快速铺设，即使在低于零下温度时，安装也简单。
因为本发明的管材具有低脆性破裂温度，因此具有更广的工作温度范围，可以在-40℃～95℃范围内正常工作。当PPR管在0℃左右变脆时，本发明管材在低于-40℃环境下，仍然是柔韧的。本发明的管材具有良好的耐化学腐蚀性，使用寿命长，在正常条件下，管道可安全使用50年；本发明的管道不容易破碎，通过测试，本发明的管材在-30℃时，其缺口冲击强度达到13KJ/m 2，在-40℃低温下依然可以实现免受冲击保持正常工作状态，而PPR管道在低于-20℃的低温下就会损坏。
本发明的管材具有和PPR一样能插座焊接，性能和PPR一样可靠，而PE-RT的插座焊接性能不可靠，另外本发明使用盘卷供应方 式并且可灵活弯曲，转角无需使用弯头，不需要使用很多接头，有效降低安装成本。由于使用的弯头少得多，因此大多数管道可使用较小的管径，如原来25mm管道，本发明可使用20mm代替。因为弯头会产生流阻，降低流量，而减少使用弯头意味着流量增加。
本发明与PPR管安装相比，降低了材料成本，本发明管材安装中，因为本发明对配件的需要较少，材料成本可以降低15％。
本发明与PPR管安装相比，降低了人工成本，本发明在安装过程中节省了很多接头配件的安装，简化了安装工序，大大提高了管道安装的效率，因此本发明安装的人工成本可以降低35％。
本发明的产品柔韧性较好，可进行多种连接方式连接，使产品在施工更方便、省时。
PPR管道通常以4米为单位发货。而本发明的管材以盘卷供货，通常以直径20mm的一卷100米、直径25mm的一卷80米和直径32mm的一卷60米长度的形式发货，运输装载更方便，节约空间。安装时，由于接头减少，管道泄漏几率也小。
本发明的复合材料熔焊管材可应用在以下方面：
1、建筑物的冷热水系统，包括集中供热系统；
2、建筑物内的采暖系统、包括地板、壁板及辐射采暖系统；
3、可直接饮用的纯净水供水系统；
4、中央(集中)空调系统，通风设备及太阳能热水系统；
5、输送或排放化学介质等工业用管道系统.工业用管工业输送系统工业输送介质温度相对较高，且一般腐蚀性较强，要求其输送 管道系统具有较好的耐高温、耐腐蚀性能的管道系统。
以上所述仅为本发明的优选实施方式，只要以基本相同手段实现本发明目的的技术方案都属于本发明的保护范围之内。

Claims (6)

  1. 一种复合材料熔焊管材，其特征在于：由Ⅱ型PE-RT和LLDPE材料复合共挤而成，其质量百分比为：56～98％的Ⅱ型PE-RT，2～44％的LLDPE。
  2. 根据权利要求1所述的一种复合材料熔焊管材，其特征在于：所述Ⅱ型PE-RT材料为具有低熔垂特性的双峰分子量分布结构。
  3. 根据权利要求1所述的一种复合材料熔焊管材，其特征在于：Ⅱ型PE-RT由聚乙烯、乙烯和丁烯共聚而成。
  4. 根据权利要求1所述的一种复合材料熔焊管材，其特征在于：LLDPE由乙烯和a-烯烃在低温和压力条件下共聚而成。
  5. 根据权利要求4所述的一种复合材料熔焊管材，其特征在于：所述a-烯烃为丁烯、己烯或辛烯中的其中一种。
  6. 根据权利要求1所述的一种复合材料熔焊管材，其特征在于：管材最大口径为500mm。
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