CN103087385B - 一种高密度高温型热缩压敏带及其制备方法 - Google Patents
一种高密度高温型热缩压敏带及其制备方法 Download PDFInfo
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Abstract
本发明提供一种高密度高温型热缩压敏带及其制备方法，按重量百分比，包括：丁基橡胶6-12%，高分子量聚异丁烯8-15%；中分子量聚异丁烯14-19%；低分子量聚异丁烯8-12%；增粘树脂9-15%；无机增强粉料30-45%；抗氧剂0.5-1%,防老剂0.5-1%；黑色母0.5-1%。本发明中的热缩压敏胶带是一种管道补口新型材料，是一种高性能丁基橡胶改性压敏胶，将其涂覆在辐射交联聚乙烯基材上形成的热缩压敏补口材料，可以同时解决在役管线补口大修及新建管线的补口防腐问题。
Description
技术领域
本发明涉及一种高密度高温型热缩压敏带及其制备方法。
背景技术
目前，国内生产的热缩压敏胶带选用的是与传统热缩带一样的辐射交联聚乙烯作为基材，这种辐射交联聚乙烯基材多为中低密度聚乙烯。这种基材在常温下的屈服强度很高，但高温屈服强度很小。这种基材与热熔胶搭配使用时，由于热熔胶的高温剪切比较大，同时传统热缩带用于新建管线补口，回填后一般都比较夯实，所以基材在受土壤应力挤压时不会出现基材变形；当与压敏胶搭配使用时，由于压敏胶的高温剪切强度小于热熔胶，同时热缩压敏带用于老管线修复，土壤回填一般会比较松散，在高温运行下，会受土壤应力挤压而导致基材容易产生塑性形变，从而影响热缩压敏带防腐效果或出现失效。
发明内容
为了解决以上技术问题，本发明提供一种高密度高温型热缩压敏带的基材材料，按重量百分比，包括：高密度聚乙烯65-75%；中密度聚乙烯10-15%；线性低密度聚乙烯10-20%；主抗氧剂0.5-1%；辅抗氧剂0.5-1%；黑色母2-3%。
所述主抗氧剂采用抗氧剂1010、抗氧剂1076和抗氧剂SKY-1035中的一种。
所述辅抗氧剂采用抗氧剂DSTP、抗氧剂DLTP和抗氧剂PKY-168中的一种。
本发明还提供了一种高密度高温型热缩压敏带的胶带，按重量百分比，包括：丁基橡胶6-12%，高分子量聚异丁烯8-15%；中分子量聚异丁烯14-19%；低分子量聚异丁烯8-12%；增粘树脂9-15%；无机增强粉料30-45%；抗氧剂0.5-1%,防老剂0.5-1%；黑色母0.5-1%。
所述无机增强粉料采用滑石粉、轻钙、硫酸钡和高岭土中的一种
所述增粘树脂采用C5加氢石油树脂、萜烯T-100、C5/C9共聚石油树脂。
所述抗氧剂采用抗氧剂1010、抗氧剂1076和抗氧剂SKY-1035中的一种。
所述防老剂采用防老剂264、防老剂2246和防老剂DOD中的一种。
本发明还提供了一种制造高密度高温型热缩压敏带的基材材料的方法，包括以下几个步骤：
步骤A：按照所述配方按质量比称量，均匀混合后通过双螺杆挤出机，挤出造粒料；
步骤B:将均匀混合的基材原料加入双螺杆挤出机的下料口，挤出造粒得到基材造粒料：
步骤C：将步骤B得到的高密度聚乙烯基材造粒料经烘干后输送到单螺杆挤出机下料口，按下列工艺挤出、裁切成半成品：
步骤D：挤出后的片材经电子加速器辐射交联后待用。
辐射交联工艺，使挤出后的片材匀速通过电子加速器电子出口的正下方，使带有特定能量为9MeV的加速电子穿透基材，使聚乙烯分子链内部及分子链之间产生交联，其中，加速电子的特定能量。
优选的，所述步骤D中挤出的片材的厚度为1.2mm。
优选的，所述步骤D所得到的基材的密度大于0.94g/cm3，小于0.94g/cm3
优选的，所述挤出机的机筒自进料口至模头顺序设置七段加热区，各区温度依次为：120±20℃、160±20℃、170±20℃、180±20℃、185±20℃、185±20℃、185±20℃；所述挤出机的模头自一侧至另一侧依序设置有五个加热区，各区温度依次为190±25℃、190±25℃、190±25℃、190±25℃、190±25℃。
本发明还提供了一种制造高密度高温型热缩压敏带胶带的方法，包括以下几个步骤：
步骤E：按照所述配方按质量比称量通过捏合机，混合制成胶泥：
步骤F：将混合均匀胶泥通过齿轮泵输送到挤出机下料口，挤出、涂敷在基材上，再压制成品。
优选的，所述捏合机混合温度140±15℃。
优选的，所述捏合时间1.5-2小时。
优选的，所述捏合机的机筒自进料口至模头依序设置有六段加热区，各区温度依次为：120±10℃、130±10℃、135±10℃、140±10℃、140±10℃、140±10℃。
优选的，所述步骤B中所述成品的胶层厚度为1.3mm。
本发明中的高温型热缩压敏带基材采用经辐射交联的高密度聚乙烯基材，基材厚度1.2mm，胶层厚度1.3mm。
本发明中的热缩压敏胶带是一种管道补口新型材料，是一种高性能丁基橡胶改性压敏胶，将其涂覆在辐射交联聚乙烯基材上形成的热缩压敏补口材料，可以同时解决在役管线补口大修及新建管线的补口防腐问题。这种补口材料安装过程简单，防腐效果可靠；不需对焊口、主防腐层搭接部位加热；裸铁处不需喷砂只需手工去除表面浮锈和污物；手工烘烤只需基材收缩到位即可，使补口安装工效大大提高。
该补口材料基材为辐射交联聚乙烯片材，胶层为高性能丁基橡胶改性压敏胶，其通过手工火把烘烤附着于管道补口处，是一种新型高效的补口材料，提高3PE管线防腐补口的整体质量。
具体实施方式
下面对本发明的较优的实施例作进一步的详细说明：
实施例1
按重量百分比，该配方为：高密度聚乙烯（5000s）72.0%；中密度聚乙烯（m3410）9.5%；线性低密度聚乙烯（FB3003）15.5%；主抗氧剂（1010）0.6%；辅抗氧剂（DSTP）0.4%：黑色母，2.0%。
1.按照所述配方按质量比称量，均匀混合后通过双螺杆挤出机，挤出造粒料；
2.将均匀混合的基材原料加入双螺杆挤出机的下料口，挤出造粒得到基材造粒料：
3.将得到的高密度聚乙烯基材造粒料经烘干后输送到单螺杆挤出机下料口，再挤出、裁切成半成品；
4.挤出后的片材经电子加速器辐射交联后待用。
实施例2
按重量百分比，该配方为：高密度聚乙烯65%；中密度聚乙烯12%；线性低密度聚乙烯20%；主抗氧剂10760.5%；辅抗氧剂DLTP0.5%；黑色母2%。
1.按照所述配方按质量比称量，均匀混合后通过双螺杆挤出机，挤出造粒料；
2.将均匀混合的基材原料加入双螺杆挤出机的下料口，挤出造粒得到基材造粒料：
3.将得到的高密度聚乙烯基材造粒料经烘干后输送到单螺杆挤出机下料口，再挤出、裁切成半成品；
4.挤出后的片材经电子加速器辐射交联后待用。
实施例1和2所得到的压敏带基材，进行性能测试，测试结果如表1所示。
由表1可知，本压敏带基材具有高的拉伸强度和断裂伸长率、耐热、耐化学介质腐蚀能力强。本发明中的辐射交联高密度聚乙烯基材是一种具有很高的高温屈服强度、很好的耐环境应力开裂性能和较好的低温柔性，是一种区别于传统热缩带所用的中低密度聚乙烯基材的材料。
实施例3
按重量百分比，该配方为：丁基橡胶（IIR268）7%，高分子量聚异丁烯（PIB100）13.5%；中分子量聚异丁烯（PIB50）15%；低分子量聚异丁烯（PIB6240）10%；增粘树脂（萜烯T-100）12.5%；硫酸钡，40%；抗氧剂(1010)1%；防老剂（268）0.5%；黑色母0.5%混合均匀。通过捏合机，混合制成胶泥；再将混合均匀胶泥通过齿轮泵输送到挤出机下料口，挤出涂敷在实施例1所得到的基材上、压制成品。其中，基材厚度1.2mm，胶层厚度1.3mm。
实施例4
按重量百分比，该配方为：丁基橡胶（IIR268）12%，高分子量聚异丁烯（PIB100）8%；中分子量聚异丁烯（PIB50）19%；低分子量聚异丁烯（PIB6240）10%；增粘树脂（萜烯T-100）9%；滑石粉39%；抗氧剂(1010)1%；防老剂（268）1%；黑色母1%混合均匀。通过捏合机，混合制成胶泥；再将混合均匀胶泥通过齿轮泵输送到挤出机下料口，挤出涂敷在实施例2所得到的基材上、压制成品。其中，基材厚度1.2mm，胶层厚度1.3mm。
将实施例3和4所得到的压敏带胶层，进行性能测试，测试结果如表2和3所示，可知，本发明中的压敏带胶层具有优良的抗热性，且拉伸强度和断裂伸长率高，是一种新型高效的补口材料，提高3PE管线防腐补口的整体质量。
本发明高密度高温型热缩压敏胶带是一种用于管道补口修复和新建管线补口防腐的新型材料，能够承受高温运行管道不出现基材受土壤应力挤压作用而产生塑性形变，从而有效避免防腐失效。
产品在使用时，直接应用于钢、PE、PP、FBE等表面，无须涂刷底漆，完全兼容其它涂层（3层PE、环氧、沥青等等）；耐化学性和密封性好，可彻底阻断水分和氧气，杜绝水分侵入和微生物腐蚀；轻微缺陷可自我修复；管体表面处理要求低，现场操作性好；使用温度范围大，可在-30℃-60℃的高寒高温环境中施工，我国东北漠河以北冬季气温接近-30℃，产品可用于这些高寒地区的施工，该温度下的剥离强度＞200N/cm；现场施工质量容易控制，受环境、人员技术水平影响较小；产品可长期存放，无保质期限制，并且材料完全环保，可广泛应用于石油天然气管道防腐层的补口及修复。
表2高温型压敏胶性能指标
表3高密度高温型热缩压敏带安装系统的性能指标
以上内容是结合具体的优选实施方式对本发明所作的进一步详细说明，不能认定本发明的具体实施只局限于这些说明。对于本发明所属技术领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干简单推演或替换，都应当视为属于本发明的保护范围。
Claims (5)
1.一种高密度高温型热缩压敏带的胶带，其特征在于，按重量百分比，包括：丁基橡胶6-12%，高分子量聚异丁烯8-15%；中分子量聚异丁烯14-19%；低分子量聚异丁烯8-12%；增粘树脂 9-15%；无机增强粉料 30-45%；抗氧剂0.5-1%,防老剂 0.5-1%；黑色母 0.5-1%；
所述增粘树脂采用C5加氢石油树脂、萜烯T-100和C5/C9共聚石油树脂中的一种；
所述抗氧剂采用抗氧剂1010、抗氧剂1076和抗氧剂SKY-1035中的一种；
所述防老剂采用防老剂264、防老剂2246和防老剂DOD中的一种。
2.一种制造高密度高温型热缩压敏带胶带的方法，其特征在于，包括以下几个步骤：
步骤E：按照如权利要求1所述的配方按质量比称量通过捏合机，混合制成胶泥：
步骤F：将混合均匀胶泥通过齿轮泵输送到挤出机下料口，挤出涂敷在基材上，并压制成品。
3.如权利要求2所述的方法，其特征在于，所述捏合机的捏合时间为1.5-2小时，混合温度为140+15℃。
4.如权利要求2所述的方法，其特征在于，所述捏合机的机筒自进料口至模头依序设置有六段加热区，各区温度依次为：120+10℃、130+10℃、135+10℃、140+10℃、140+10℃、140+10℃。
5.如权利要求2所述的方法，其特征在于，所述步骤F中所述成品的胶层厚度为1.3mm。
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