CN103709481B - 矿用钢塑复合管道聚乙烯层组合物母料及其制备方法 - Google Patents

矿用钢塑复合管道聚乙烯层组合物母料及其制备方法 Download PDF

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CN103709481B
CN103709481B CN201310723830.2A CN201310723830A CN103709481B CN 103709481 B CN103709481 B CN 103709481B CN 201310723830 A CN201310723830 A CN 201310723830A CN 103709481 B CN103709481 B CN 103709481B
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崔全延
金海木
李木亮
杨丽芳
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QINGDAO RICH PLASTIC NEW MATERIAL CO Ltd
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Abstract

本发明涉及煤矿井下用钢塑复合管材领域，具体涉及一种矿用钢塑复合管道聚乙烯层组合物母料及其制备方法，所述聚乙烯层组合物母料按照以下重量百分比组成：聚乙烯20〜50%、乙烯‑辛烯共聚物2〜20%、导电炭黑15~45%、阻燃剂10~25%、分散剂1〜20%、稳定剂0.1~2%；所述聚乙烯为低密度聚乙烯、线性低密度聚乙烯及乙烯‑醋酸乙烯共聚物的一种或几种。矿用钢塑复合管道使用本发明提供的聚乙烯层，克服了钢管本身存在的易生锈、腐蚀、高污染及塑料管强度低、易变形的缺陷，整合了钢管和塑料产品的共同优点；可根据不同口径管道的聚乙烯层壁厚不同，调整聚乙烯层组合物母料的比例，满足阻燃、导电性能要求；而且，成本低，易得，性能持续稳定。

Description

矿用钢塑复合管道聚乙烯层组合物母料及其制备方法
技术领域
本发明涉及煤矿井下用钢塑复合管材领域，具体涉及一种矿用钢塑复合管道聚乙烯层组合物母料及其制备方法。
背景技术
矿用钢塑复合管是在普通钢管喷砂、除锈处理的基础上，根据工作环境、使用压力、输送介质等条件，采用高分子矿用聚乙烯改性料，通过特定的挤出设备将其均匀地挤出涂敷于钢管表面，形成一层均匀的塑料层，成为一种新型的钢塑复合管。矿用钢塑复合管集钢材的机械性能与塑料层的耐化学腐蚀性能于一体，非常适合大口径矿井抽放瓦斯管路。
煤矿井下用抽放瓦斯用到各种类型管道。一般分为钢管、聚乙烯管、聚氯乙烯管和玻璃钢管及钢塑复合管。其中螺旋钢带增强复合聚乙烯塑料管既具有钢管的承压优势又兼备塑料管的耐腐蚀、重量轻等特点，作为一种新型复合管在煤矿抽放瓦斯、排风等领域应用越来越广泛。煤矿井下用塑料管材，必须符合煤炭部MT181-1988的安全方面要求，具有抗静电、耐腐蚀、管壁光滑、机械强度高、连接方便、使用寿命长、有效增强安全性等性能要求。
但是，目前的普通钢塑复合管不能同时满足煤矿井下用管的阻燃、导电性能要求。市面上出现的矿用聚乙烯专用料不能满足小壁厚和大壁厚制品的成本平衡问题，通用性不强。
发明内容
本发明针对现有技术中的不足，旨在解决钢塑复合管聚乙烯层的阻燃、导电问题和通用性问题，提供一种具有阻燃导电作用矿用钢塑复合管道聚乙烯层组合物母料及其制备方法。
本发明的技术方案是：
一种矿用钢塑复合管道聚乙烯层组合物母料，所述聚乙烯层组合物按照以下重量百分比组成：聚乙烯20～50%、乙烯-辛烯共聚物2～20%、导电炭黑15～45%、阻燃剂10～25%、分散剂1～15%、稳定剂0.1～2%；所述聚乙烯为低密度聚乙烯、线性低密度聚乙烯及乙烯-醋酸乙烯共聚物的一种或几种。
本发明中，选取低密度聚乙烯、线性低密度聚乙烯和乙烯醋酸乙烯共聚物为基料。低密度聚乙烯对助剂的包容性好；线性低密度耐应力开裂性和强度优于低密度聚乙烯；乙烯醋酸乙烯共聚物柔韧、耐冲击好，耐环境应力开裂性优良。因此，我们将以上三种物料根据不同使用要求，进行搭配组合。
本发明中包含的乙烯-辛烯共聚物，为增韧剂，提高制品的冲击性能、改善耐环境应力开裂性能。
本发明中选用的导电剂是导电炭黑，同普通导电剂相比，具有材料价格低廉易得、更优异的导电性能和永久性的导电性能，不随工作环境湿度的变化产生导电波动；
在以上方案的基础上，所述的阻燃剂为磷系阻燃剂。同时使用表面活性剂对阻燃剂进行处理。与常用的溴系阻燃剂相比，具有添加量低，比重小，对制品力学性能影响小的特点，并在燃烧过程不会产生对人体环境有害的二噁英。
在以上方案的基础上，所述的分散剂为硬脂酸、硬脂酸盐、聚乙烯蜡中的一种或几种。
在以上方案的基础上，所述的稳定剂为二巯基乙酸异辛酯二正辛基锡或一苯基二异辛基亚磷酸酯、含羟基芳基亚磷酸酯中的一种或多种。
本发明还公开了一种上述矿用钢塑复合管道聚乙烯层组合物母料的制备方法，将上述组分按顺序放入搅拌机中混合均匀，再用双螺杆挤出机挤出造粒或采用加压式密炼机密炼，螺杆挤出机挤出造粒成型。
本发明的有益效果是：
1）矿用钢带螺旋管管道复合涂覆本发明提供的聚乙烯组合料层，克服了钢管本身存在的易生锈、腐蚀、高污染及塑料管强度低、易变形的缺陷，整合了钢管和塑料产品的共同优点，同时满足阻燃、导电性能要求，而且，成本低，易得，性能持续稳定；
2）将线性低密度聚乙烯、乙烯-醋酸乙烯共聚物和乙烯-辛烯共聚物复合使用，提高了制品的耐冲击性、韧性，同时，耐环境应力性能有所提高；
3）本发明产品的阻燃剂选取为磷系阻燃剂，具有添加量低，比重小且不产生对人体有害的二噁英，对制品力学性能影响小。
4）采用浓缩母料方法，将阻燃、抗静电以及增韧的有效成分浓缩制成母料。通过调整母料与聚乙烯原料的配比，解决了聚乙烯层不同壁厚对制品阻燃、导电性的影响；并降低成本。
具体实施方式
本发明的具体实施方式如下：
实施例1
一种矿用钢塑复合管道聚乙烯层组合物母料，所述聚乙烯层组合物母料按照以下重量百分比组成：聚乙烯43%、乙烯-辛烯共聚物10%、导电炭黑20%、阻燃剂25%、分散剂1%、稳定剂1%；所述聚乙烯为低密度聚乙烯、线性低密度聚乙烯及乙烯-醋酸乙烯共聚物的一种或几种。
其中，所述的分散剂为硬脂酸、硬脂酸盐的混合物。所述的稳定剂为二巯基乙酸异辛酯二正辛基锡、一苯基二异辛基亚磷酸酯的混合物。
将上述组分按顺序放入搅拌机中混合均匀，再用双螺杆挤出机挤出造粒或采用加压式密炼机密炼，螺杆挤出机挤出造粒成型。
实施例2：
一种矿用钢塑复合管道聚乙烯层组合物母料，所述聚乙烯层组合物母料按照以下重量百分比组成：聚乙烯20%、乙烯-辛烯共聚物14.8%、导电炭黑45%、阻燃剂10%、分散剂10%、稳定剂0.2%；所述的聚乙烯为低密度聚乙烯：乙烯-醋酸乙烯共聚物的混合物，所述的低密度聚乙烯：乙烯-醋酸乙烯共聚物质量配比为2:1。
其中，所述的分散剂为硬脂酸、硬脂酸盐的混合物。所述的稳定剂为二巯基乙酸异辛酯二正辛基锡、一苯基二异辛基亚磷酸酯的混合物。
将上述组分按顺序放入搅拌机中混合均匀，再用双螺杆挤出机挤出造粒或采用加压式密炼机密炼，螺杆挤出机挤出造粒成型。
实施例3：
一种矿用钢塑复合管道聚乙烯层组合物母料，所述聚乙烯层组合物母料按照以下重量百分比组成：聚乙烯31%、乙烯-辛烯共聚物2%、导电炭黑30%、磷系阻燃剂18%、分散剂17.5%、稳定剂1.5%；所述的聚乙烯为低密度聚乙烯：线性低密度聚乙烯的混合物，所述的低密度聚乙烯：线性低密度聚乙烯质量配比为2:1。
其中，所述的分散剂为硬脂酸、硬脂酸盐、聚乙烯蜡中的混合物，所述的稳定剂为二巯基乙酸异辛酯二正辛基锡或一苯基二异辛基亚磷酸酯、含羟基芳基亚磷酸酯中的混合物。
将上述组分按顺序放入搅拌机中混合均匀，再用双螺杆挤出机挤出造粒或采用加压式密炼机密炼，螺杆挤出机挤出造粒成型。
实施例4：
一种矿用钢塑复合管道聚乙烯层组合物母料，所述聚乙烯层组合物母料按照以下重量百分比组成：聚乙烯50%、乙烯-辛烯共聚物5%、导电炭黑20%、磷系阻燃剂10%、分散剂14.2%、稳定剂0.8%；所述的聚乙烯为低密度聚乙烯：乙烯-醋酸乙烯共聚物的混合物，所述的低密度聚乙烯：乙烯-醋酸乙烯共聚物质量配比为3:1。
其中，所述的分散剂为硬脂酸盐、聚乙烯蜡的混合。所述的稳定剂为二巯基乙酸异辛酯二正辛基锡、含羟基芳基亚磷酸酯的混合物。
将上述组分按顺序放入搅拌机中混合均匀，再用双螺杆挤出机挤出造粒或采用加压式密炼机密炼，螺杆挤出机挤出造粒成型。
实验例1：
本发明实施例1所得的母粒与聚乙烯比例（重量％）：
高密度聚乙烯2480 50
本发明实施例1所得的母粒 50
将原料放入搅拌机中混合均匀，上料烘干，干燥温度为90°C；再用单螺杆挤出机挤出造粒。
实验例2:
本发明实施例2所得的母粒与聚乙烯比例（重量％）：
线性低密度聚乙烯 20
高密度聚乙烯2480 30
本发明实施例1所得的母粒 50
将原料放入搅拌机中混合均匀，上料烘干，干燥温度为90°C；再用单螺杆挤出机挤出造粒。
将实验例挤出造粒物料干燥后，制备国标样条，测试性能如下表1：
表1 测试性能
实验例1 实验例2
拉伸强度，MPa 19.42 15.94
断裂伸长率，% 406 463
表面电阻，Ω 2×104 3×104
有焰燃烧单根最大值，s 2.1 1.5
有焰燃烧6根总和，s 6.7 6.3
无焰燃烧单根最大值，s 3 2.2
无焰燃烧6根总和，s 10.5 9.4
简支梁冲击强度，KJ/m2 19.45 22.3
悬臂梁冲击强度，KJ/m2 22.1 23.42
比重 1.037 1.094
从上表可以看出，本发明制备的矿用钢塑复合管道聚乙烯层组合物母料拉伸强度、断裂伸长率高，导电、阻燃性能达或到超过MT181标准要求，冲击强度好。

Claims (5)

1.一种矿用钢塑复合管道聚乙烯层组合物母料，其特征在于，所述聚乙烯层组合物母料按照以下重量百分比组成：聚乙烯20～50％、乙烯-辛烯共聚物2～20％、导电炭黑15～45％、阻燃剂10～25％、分散剂1～20％、稳定剂0.1～2％；所述聚乙烯为低密度聚乙烯与乙烯-醋酸乙烯共聚物的混合物或者低密度聚乙烯与线性低密度聚乙烯的混合物，其中低密度聚乙烯与乙烯-醋酸乙烯共聚物的质量比为2:1-3:1，低密度聚乙烯与线性低密度聚乙烯的质量比为2:1-3:1。
2.根据权利要求1所述的矿用钢塑复合管道聚乙烯层组合物母料，其特征在于，所述的阻燃剂为磷系阻燃剂。
3.根据权利要求1所述的矿用钢塑复合管道聚乙烯层组合物母料，其特征在于，所述的分散剂为硬脂酸、硬脂酸盐、聚乙烯蜡中的一种或几种。
4.根据权利要求1所述的矿用钢塑复合管道聚乙烯层组合物母料，其特征在于，所述的稳定剂为二巯基乙酸异辛酯二正辛基锡或一苯基二异辛基亚磷酸酯、含羟基芳基亚磷酸酯中的一种或多种。
5.一种根据权利要求1所述矿用钢塑复合管道聚乙烯层组合物母料的制备方法，其特征在于，将上述组分按顺序放入搅拌机中混合均匀，再用双螺杆挤出机挤出造粒或采用加压式密炼机密炼，螺杆挤出机挤出造粒成型。
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