CN114801342A - 一种超高分子量聚乙烯增强改性聚丙烯直壁管材 - Google Patents
一种超高分子量聚乙烯增强改性聚丙烯直壁管材 Download PDFInfo
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Abstract
本发明涉及高分子复合材料领域,具体为一种超高分子量聚乙烯增强改性聚丙烯直壁管材,由内层和外层经热熔复合构成,外层波纹呈多边“∩”型波形结构,外层和内层均采用超高分子量聚乙烯增强改性聚丙烯复合材料制成;超高分子量聚乙烯增强改性聚丙烯复合材料包括如下原料:PPR,PPB,超高分子量聚乙烯,线性聚乙烯LLDPE,相容增韧剂,β成核剂,熔脂调节剂,纳米级滑石粉,1250目滑石粉,白碳黑,扩散油,硅烷偶联剂,光稳定剂,抗氧剂1010,抗氧剂168。本发明提高了环刚度、环柔度、抗冲击性能、高低温性能。
Description
技术领域
本发明涉及高分子复合材料领域,特别是涉及一种超高分子量聚乙烯增强改性聚丙烯直壁管材。
背景技术
当前,我国用于双壁波纹结构管生产的原料主要有聚氯乙烯(PVC)、聚乙烯(PE)和聚丙烯(PP)。聚氯乙烯双壁波纹管的优点在于聚氯乙烯材料的刚性高,其材料的弹性模量大于聚乙烯材料。因此达到同等的环刚度可以用较小的惯性矩,如果采用同样的波形设计可以用较小的壁厚。所以在一定范围内聚氯乙烯双壁波纹管在经济性上占优势,但由于聚氯乙烯材料的流动性和热稳定性比较差,生产大口径双壁波纹管有困难,以及聚乙烯材料的良好柔韧性,可以在低温环境下施工,聚乙烯管材具有可以熔接,比重轻等优点。
国内的一些普通管材料在生产大口径双壁波纹管时会出现熔体强度不够、产品环刚度达不到要求等问题。环刚度和环柔度是管材最重要的性能指标,因为在埋地排水管的应用中,管材不承受内压或压力很低,而只承受外压负载。如果管材的环刚度太小,管材将发生大的变形破坏,这样就不能保证管材的安全使用;若环柔度过低,管材在使用过程中易破坏漏水等。添加入无机填料,如:短切玻璃纤维、碳酸钙、滑石粉、高岭土、硅灰石等,以降低材料成本、提高材料性能的刚性,然而,在塑料材料中加入无机填充材料后一般都会使材料性能变脆,缺口冲击韧性下降,材料的使用性能因此受到明显影响。增加塑料的韧性时,早期通常采用橡胶类弹性体进行,例如:ABS(聚丙烯腈_丁二烯_苯乙烯),HIPS(耐冲击性聚苯乙烯)和EPDM[聚丙烯/三元乙丙橡胶(含双环戊二烯)]等增韧体系,橡胶增韧聚合物可使冲击韧性成倍增长,但由于其模量和玻璃化温度低,给增韧塑料带来固有的缺陷,如材料的刚度、强度、热变形温度大幅度降低,成本提高等。聚乙烯复合材料所表现的强度增加或韧性提高总是以牺牲其它性能为代价的,所以如何保持超高分子量聚乙烯增强改性聚丙烯复合材料强度和韧性的平衡和耐高低温性能是制备埋地排污超高分子量聚乙烯增强改性聚丙烯(PP-UHM)直壁管材的关键问题。
聚丙烯(PP)是一种通用合成树脂,由于其具有耐化学腐蚀、耐热、无毒、易加工等优异的综合性能,在器械制造业、汽车工业、模具、家用电器等领域得到了广泛应用。但聚丙烯也存在一些缺陷,例如:韧性差、低温脆性、不耐老化性、冲击强度低、收缩率大等,限制了其作为工程受力材料等方面的应用。因此,对PP进行耐老化、增韧增强等改性处理,拓宽其应用范围。而超高分子量聚乙烯(UHMWPE)是一种具有线型结构、综合性能优异的新型热塑性工程塑料,具有其他工程塑料无可比拟的耐磨性、耐腐蚀性、抗冲击性、自润滑性等性能,被认为是可以代替钢铁广泛应用于各个领域的理想型高性能塑料。因此,选用UHMWPE作为增强改性材料,与聚丙烯混合,制备复合材料,期望达到改善聚丙烯力学性能的目。
现有聚乙烯埋地排污管环刚度不够、环柔度过低、低温脆性、冲击强度差。
发明内容
本发明目的是针对背景技术中存在的问题,提出一种超高分子量聚乙烯增强改性聚丙烯直壁管材,提高了环刚度、环柔度、抗冲击性能、高低温性能,能满足埋地排污管特殊环境性能要求。
本发明的技术方案,一种超高分子量聚乙烯增强改性聚丙烯直壁管材,由内层和外层经热熔复合构成,外层波纹呈多边“∩”型波形结构,外层和内层均采用超高分子量聚乙烯增强改性聚丙烯复合材料制成。
超高分子量聚乙烯增强改性聚丙烯复合材料包括如下按重量份计的原料:25-30份PPR,25-30份PPB,8-10份超高分子量聚乙烯,8-10份线性聚乙烯LLDPE,3-5份相容增韧剂(用弹性体POE接枝做相容增韧剂,增韧的同时,提高了复合材料体系的相容性),0.3-0.5份β成核剂,0.2-0.4份熔脂调节剂,15-20份纳米级滑石粉,5-10份1250目滑石粉,1-3份白碳黑,0.3-0.6份扩散油,1-2份硅烷偶联剂,0.3-0.6份光稳定剂,0.3-0.6份抗氧剂1010,0.3-0.6份抗氧剂168。
优选的,按以下重量份配置原料:25-30份PPR,25-30份PPB,8-10份超高分子量聚乙烯,8-10份线性聚乙烯LLDPE,3-5份相容增韧剂,0.3-0.5份β成核剂,0.2-0.4份熔脂调节剂,将以上材料加入高速混合机中混合5-10分钟,制得物料A;
按以下重量份配置原料:15-20份纳米级滑石粉,5-10份1250目滑石粉,1-3份白碳黑,0.3-0.6份扩散油,1-2份硅烷偶联剂,0.3-0.6份光稳定剂,0.3-0.6份抗氧剂1010,0.3-0.6份抗氧剂168,将以上材料加入高速混合机中混合5-10分钟,制得物料B。
优选的,将物料A和物料B利用高速混合机组进行混合、改性、预塑化,再通过双阶挤出机组进行熔融、塑化、混炼、挤出、造粒,最后冷却切粒,得到具有超高分子量聚乙烯增强改性聚丙烯复合材料,料筒温度分别为:190℃,210℃,220℃,220℃,220℃,口模温度为:220℃。
优选的,将物料A和物料B利用密炼机进行混合、改性、熔融、塑化、混炼,再通过挤出机组进行挤出、造粒,最后冷却切粒,得到超高分子量聚乙烯增强改性聚丙烯复合材料。
优选的,在制备管材时,将内层材料和外层材料分别加入两台挤出机中挤出,物料通过挤出机单螺杆加热熔融塑化输送至机头口模,管材内层通过内定径套抽真空再冷却定型,管材外层在内部空气压力和外部真空吸力的共同作用下和模块紧密接触成型,管材内、外层均匀地熔合在一起,内层挤出各段温度:190℃,210℃,220℃,225℃,225℃,外层挤出各段温度:195℃,215℃,225℃,225℃,225℃。
与现有技术相比,本发明具有如下有益的技术效果:
本发明采用超高分子量聚乙烯材和纳米粒子的增强增韧形成多元与复合材料,采用该复合材料制备超高分子量聚乙烯增强改性聚丙烯(PP-UHM)直壁管材,所制备的超高分子量聚乙烯增强改性聚丙烯(PP-UHM)直壁管材的环刚度、环柔度、抗冲击性能、高低温性能等都明显提高,能满足埋地排污管特殊环境性能要求。
附图说明
图1为波纹管及可视套筒接头组装状态下的结构示意图;
图2为图1的结构剖视图;
图3为图2中A处的结构放大图;
图4为可视套筒接头的结构剖视图;
图5为图4中B处的结构放大图;
图6为图4中卡扣的结构示意图。
附图标记:1、套筒;11、操作孔;12、扣板部;121、连接板部;1211、凹槽;122、限位台部;2、挡台;3、卡扣;31、安装台部;32、插台部;4、波纹管主体;5、密封圈。
具体实施方式
本发明提出的一种超高分子量聚乙烯增强改性聚丙烯直壁管材,由内层和外层经热熔复合构成,外层波纹呈多边“∩”型波形结构,外层和内层均采用超高分子量聚乙烯增强改性聚丙烯复合材料制成。
超高分子量聚乙烯增强改性聚丙烯直壁管材及连接结构包括套筒1、挡台2、卡扣3、波纹管主体4和密封圈5。
如图1-5所示,波纹管主体4外周面具有多个沿轴向并排设置的波谷。密封圈5同轴套设在波纹管主体4的波谷处。套筒1具有可视孔,以及具有操作孔11以形成卡扣在波纹管主体4波谷处的扣板部12,操作孔11为U形孔,便于扣板部12发生变形。波纹管主体4外壁至套筒1内壁沿径向的距离为2mm-6mm。挡台2设置在套筒1内壁上,挡台2绕套筒1均匀设置多个,挡台2供波纹管主体4端部抵接,实现了对波纹管主体4安装位置的定位。卡扣3扣接在可视孔处。通过多种连接方式提高连接牢靠性和密封性。对于波纹管与可视套筒接头的密封连接,通过密封圈5来实现。对于波纹管与可视套筒接头在密封连接后的限位方面,通过挡台2对波纹管的安装位置进行定位,并通过扣板部12和卡扣3实现对波纹管主体4的限位,限位方式多样,限位效果好。
如图3所示,密封圈5包括安装环部、密封环部a、密封环部b和密封环部c;密封环部a、密封环部b和密封环部c的内径相同,外径逐渐增大,且密封环部a、密封环部b和密封环部c依次同轴设置在安装环部外周面上,密封圈5具有外径逐渐增大的密封环部a、密封环部b和密封环部c,提高了密封连接时的牢靠性,能实现多重密封效果。密封环部a沿径向的外端面直径沿远离密封环部b方向逐渐增大,密封环部b沿径向的外端面直径沿远离密封环部c方向逐渐增大,密封环部c沿径向的外端面直径沿远离密封环部b方向逐渐减小,则密封环部c、密封环部b和密封环部a外端面能起到导向作用,密封环部c、密封环部b和密封环部a能更顺畅的沿由密封环部c至密封环部a方向发生变形。在将波纹管插到套筒1内侧时,密封圈5会发生弹性变形,密封环部c、密封环部b和密封环部a依次发生弹性变形,变形方向如图3中箭头所示,密封环部c紧贴在套筒1内壁上,且向密封环部b发生变形,将密封环部b压变形,然后,密封环部b将密封环部a压变形,有效提高了密封圈5与套筒1的连接牢靠性,从而保证了密封连接效果。
如图6所示,卡扣3包括安装台部31和插台部32,安装台部31为弧形结构,且贴合设置在套筒1外壁上,插台部32在安装台部31上均匀设置有多个,插台部32卡嵌设置在可视孔处和波纹管主体4的波谷处。在安装卡扣3时,按压卡扣3两端,使卡扣3发生变形,然后将卡扣3的插台部32穿过可视孔,使插台部32卡在波谷处,实现了对套筒1和波纹管主体4的限位,安装台部31贴合在套筒1外壁上,安装结构整洁。另外,通过可视孔便于对密封圈5的变形密封情况进行查看,可视孔设有多组;多组可视孔以套筒1的中轴线为中心呈圆周均匀分布,每组可视孔至少设有两个,多组可视孔位于多个扣板部12与多个挡台2之间。
如图5所示,扣板部12包括连接板部121和连接在连接板部121内侧的限位台部122,限位台部122为弧形结构,限位台部122端部轮廓为三角形或矩形或梯形,限位台部122能卡在波纹管主体4的波谷处,实现对波纹管安装后的限位。连接板部121外侧面上沿套筒1轴向并排设置有多个凹槽1211,便于扣板部12发生弹性变形。进一步的,扣板部12设有多组;多组扣板部12呈圆周均匀分布;每组扣板部12的数量至少为两个。连接板部121外侧面上沿套筒1轴向并排设置有多个加强筋,从而有效提高了扣板部12的结构强度。
实施例一
超高分子量聚乙烯增强改性聚丙烯(PP-UHM)直壁管材复合材料的配方如下:
按以下重量份配置原料:25份PPR,25份PPB,8份超高分子量聚乙烯,8份线性聚乙烯LLDPE,3份相容增韧剂,0.3份β成核剂,0.2份熔脂调节剂,将以上材料加入高速混合机中混合5-10分钟,制得物料A;
按以下重量份配置原料:20份纳米级滑石粉,10份1250目滑石粉,3份白碳黑,0.6份扩散油,2份硅烷偶联剂,0.6份光稳定剂,0.6份抗氧剂1010,0.6份抗氧剂168,将以上材料加入高速混合机中混合5-10分钟,制得物料B。
为了改善无机填充的增强增韧功能,采用不同粒径不同目数的纳米级无机粉体材料以立体网格结构形态分布其中,并通过高分散高粘的硅性扩散油,对无机粉体进行分散。
超高分子量聚乙烯增强改性聚丙烯复合材料的制备方法包括如下两种方式:
第一种制备方法:将物料A和物料B利用高速混合机组进行混合、改性、预塑化,再通过双阶挤出机组进行熔融、塑化、混炼、挤出、造粒,最后冷却切粒,得到具有超高分子量聚乙烯增强改性聚丙烯复合材料,料筒温度分别为:190℃,210℃,220℃,220℃,220℃,口模温度为:220℃。
第二种制备方法:将物料A和物料B利用密炼机进行混合、改性、熔融、塑化、混炼,再通过挤出机组进行挤出、造粒,最后冷却切粒,得到超高分子量聚乙烯增强改性聚丙烯复合材料。
在制备管材时,将内层材料和外层材料分别加入两台挤出机中挤出,物料通过挤出机单螺杆加热熔融塑化输送至机头口模,管材内层通过内定径套抽真空再冷却定型,管材外层在内部空气压力和外部真空吸力的共同作用下和模块紧密接触成型,管材内、外层均匀地熔合在一起,内层挤出各段温度:190℃,210℃,220℃,225℃,225℃,外层挤出各段温度:195℃,215℃,225℃,225℃,225℃。
表1:实施例一制备的超高分子量聚乙烯增强改性聚丙烯(PP-UHM)直壁管材的物理力学性能
实施例二
超高分子量聚乙烯增强改性聚丙烯(PP-UHM)直壁管材复合材料,本实施例与实施例一的区别在于,本实施例中:
按以下重量份配置原料:30份PPR,30份PPB,10份超高分子量聚乙烯,10份线性聚乙烯LLDPE,5份相容增韧剂,0.5份β成核剂,0.4份熔脂调节剂,将以上材料加入高速混合机中混合5-10分钟,制得物料A;
按以下重量份配置原料:15份纳米级滑石粉,5份1250目滑石粉,1份白碳黑,0.3份扩散油,1份硅烷偶联剂,0.3份光稳定剂,0.3份抗氧剂1010,0.3份抗氧剂168,将以上材料加入高速混合机中混合5-10分钟,制得物料B。
表2:实施例二制备的超高分子量聚乙烯增强改性聚丙烯(PP-UHM)直壁管材的物理力学性能
本发明采用超高分子量聚乙烯材和纳米粒子的增强增韧形成多元与复合材料,采用该复合材料制备超高分子量聚乙烯增强改性聚丙烯(PP-UHM)直壁管材,所制备的超高分子量聚乙烯增强改性聚丙烯(PP-UHM)直壁管材的环刚度、环柔度、抗冲击性能、高低温性能等都明显提高,能满足埋地排污管特殊环境性能要求。
上面结合附图对本发明的实施方式作了详细说明,但是本发明并不限于此,在所属技术领域的技术人员所具备的知识范围内,在不脱离本发明宗旨的前提下还可以作出各种变化。
Claims (5)
1.一种超高分子量聚乙烯增强改性聚丙烯直壁管材,其特征在于,由内层和外层经热熔复合构成,外层波纹呈多边“∩”型波形结构,外层和内层均采用超高分子量聚乙烯增强改性聚丙烯复合材料制成;
超高分子量聚乙烯增强改性聚丙烯复合材料包括如下按重量份计的原料:25-30份PPR,25-30份PPB,8-10份超高分子量聚乙烯,8-10份线性聚乙烯LLDPE,3-5份相容增韧剂,0.3-0.5份β成核剂,0.2-0.4份熔脂调节剂,15-20份纳米级滑石粉,5-10份1250目滑石粉,1-3份白碳黑,0.3-0.6份扩散油,1-2份硅烷偶联剂,0.3-0.6份光稳定剂,0.3-0.6份抗氧剂1010,0.3-0.6份抗氧剂168。
2.根据权利要求1所述的一种超高分子量聚乙烯增强改性聚丙烯直壁管材,其特征在于,按以下重量份配置原料:25-30份PPR,25-30份PPB,8-10份超高分子量聚乙烯,8-10份线性聚乙烯LLDPE,3-5份相容增韧剂,0.3-0.5份β成核剂,0.2-0.4份熔脂调节剂,将以上材料加入高速混合机中混合5-10分钟,制得物料A;
按以下重量份配置原料:15-20份纳米级滑石粉,5-10份1250目滑石粉,1-3份白碳黑,0.3-0.6份扩散油,1-2份硅烷偶联剂,0.3-0.6份光稳定剂,0.3-0.6份抗氧剂1010,0.3-0.6份抗氧剂168,将以上材料加入高速混合机中混合5-10分钟,制得物料B。
3.根据权利要求2所述的一种超高分子量聚乙烯增强改性聚丙烯直壁管材,其特征在于,将物料A和物料B利用高速混合机组进行混合、改性、预塑化,再通过双阶挤出机组进行熔融、塑化、混炼、挤出、造粒,最后冷却切粒,得到具有超高分子量聚乙烯增强改性聚丙烯复合材料,料筒温度分别为:190℃,210℃,220℃,220℃,220℃,口模温度为:220℃。
4.根据权利要求2所述的一种超高分子量聚乙烯增强改性聚丙烯直壁管材,其特征在于,将物料A和物料B利用密炼机进行混合、改性、熔融、塑化、混炼,再通过挤出机组进行挤出、造粒,最后冷却切粒,得到超高分子量聚乙烯增强改性聚丙烯复合材料。
5.根据权利要求1所述的一种超高分子量聚乙烯增强改性聚丙烯直壁管材,其特征在于,在制备管材时,将内层材料和外层材料分别加入两台挤出机中挤出,物料通过挤出机单螺杆加热熔融塑化输送至机头口模,管材内层通过内定径套抽真空再冷却定型,管材外层在内部空气压力和外部真空吸力的共同作用下和模块紧密接触成型,管材内、外层均匀地熔合在一起,内层挤出各段温度:190℃,210℃,220℃,225℃,225℃,外层挤出各段温度:195℃,215℃,225℃,225℃,225℃。
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