CN104530589A - 一种纤维增强高抗冲pvc-u管材及其制备方法 - Google Patents
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Abstract
本发明公开了一种纤维增强高抗冲PVC-U管材及其制备方法。首先按照以下比例称料:PVC树脂50份,钙锌稳定剂1~2份,轻质碳酸钙5~20份,硬脂酸0.2~0.6份,PE蜡0.4~1.2份,ACR抗冲剂0.5~1.5份,氯化聚乙烯0.4~1份,经偶联剂改性的短切纤维10~25份,将上述原料混合均匀后在双辊塑炼机上制得纤维增强PVC母料。将该母料添加到PVC-U管材配方中,按照通用方法制备PVC-U管材。按照本发明公布方法生产的管材产品抗冲强度及静液压强度等性能显著提高,且短切纤维价格低于PVC树脂价格,短切纤维的加入,可适当降低PVC树脂的含量,即降低管材的原料成本,提升产品的市场竞争力。
Description
技术领域
本发明属于PVC-U管材生产领域,尤其涉及一种由纤维增强的高抗冲PVC-U管材及其制备方法。
背景技术
硬质聚氯乙烯PVC管材(PVC-U管材)即为常用的输水管材,其主要成份为聚氯乙烯,另外加入增塑剂、抗老化剂等辅料来增加其耐热性、韧性、延展性、静液压强度等性能,由于它的拉伸强度、压缩强度、弯曲强度、隔热等性能均较好,且价格也较低廉,还具有质轻、光洁、美观、水阻小、组配灵活、安装省时省力、耐酸、耐碱、耐腐蚀性、强度高等优点,受到了广大用户的青睐。
但是,在实际使用过程中,硬质PVC管材常常会出现静液压试验和落锤冲击试验不能同时达标的现象。大多数企业生产的PVC管材或者是承压合格而落锤冲击性能不合格,或者是落锤冲击性能合格而承压性能不合格。由于硬质PVC管材的这两项指标不合格引起了许多节水工程中使用的PVC管材出现了“爆管”现象。PVC管材的落锤冲击不合格必然导致管材在搬运的过程中或安装的过程中由于受到石子砂粒的刮磨而出现破裂,静液压性能不合格导致PVC管材在通水时因无法满足水压而破裂。
发明内容
本发明所要解决的技术问题是提供一种由纤维增强的高抗冲PVC管材,产品的静液压试验和落锤冲击试验可同时达标,且具有低廉的成本。
本发明所要解决的另一个技术问题是提供该PVC管材的制备方法。
为了实现上述技术目的,本发明提供了如下的技术方案:
首先制备纤维增强PVC母料,其特征在于:它由下述重量份的原料制成:PVC树脂50份,钙锌稳定剂1~2份,轻质碳酸钙5~20份,硬脂酸0.2~0.6份,PE蜡0.4~1.2份,ACR抗冲剂0.5~1.5份,氯化聚乙烯0.4~1份,经偶联剂改性的短切纤维10~25份。
所述PVC树脂为SG-5型。
所述钙锌稳定剂为水滑石体系或沸石体系的固体钙锌稳定剂。
所述轻质碳酸钙的细度要求大于400目。
所述偶联剂为甲氧基型硅烷偶联剂,使用时将其与甲醇配制1:5~20的溶液后对短切纤维进行表面改性。
所述短切纤维长度为5~20mm的玻璃纤维或植物纤维。
如上所述纤维增强PVC母料的制备方法,包括如下步骤:
(1)为了使纤维与树脂基体具有良好的相容性,需对短切纤维进行改性。首先将甲氧基型硅烷偶联剂与甲醇按照一定比例配制成溶液置于喷壶中,称取一定量的短切纤维,硅烷偶联剂溶液从喷壶中以雾状喷出,均匀喷至短切纤维表面,保证短切纤维充分浸润,最后将浸润纤维置于烘箱中烘干即得偶联剂改性短切玻纤,烘箱要求具有排气装置,纤维烘干气体需及时排出;
(2)按照比例称量各种原料;
(3)将各组分投入混料机中以30~80转/分钟的速率搅拌均匀,得到絮状的混合料,将混合料在双辊塑炼机上塑炼,双辊塑炼机前辊的温度设定为150~200℃,后辊的温度设定为120~180℃,通过调整双辊间距及转速,得到不连续的薄片状纤维增强PVC母料,母料的具体要求为:树脂初步塑化,纤维在母料中均匀分散、无明显团聚。
纤维增强高抗冲PVC-U管材,其组成原料的重量份为:PVC树脂100份、短切纤维增强PVC母料25~35份,钙锌稳定剂1~3份,轻质碳酸钙10~40份,硬脂酸0.5~1份,PE蜡1~2份,以上各组分特征与上述短切纤维增强PVC母料中组分特征相同。
上述纤维增强PVC-U管材的制备方法,包括如下步骤:
(1)按按配比称量各种原料;
(2)将各组分投入高速混合机中以100~120转/分钟的速率搅拌均匀,得到混合料;设定机筒加热温度并开始加热,当所述混合料温度达到85~95℃时,放入低速冷混搅拌机中以20~40转/分钟的速率冷混搅拌,当混合料的温度达到35~45℃时,卸料,并投入螺旋杆挤出机中,在机筒加热温度为150~200℃、口模温度为150~200℃、螺杆转速为5~30转/分钟、加料转速为5~50转/分钟的条件下,按常规方法依次进行挤出加工成型、真空定形、冷却、牵引、最后进一步冷却至室温后根据所需的长度切断并进行管材扩口即得。
本发明具有以下有益效果:
(1)本发明将短切纤维制成纤维增强PVC母料加入到PVC管材中,明显增强的管材的抗冲强度及静液压强度,提高了管材的综合性能。
(2)短切纤维价格低于PVC树脂价格,短切纤维的加入,可适当降低PVC树脂的含量,即降低管材的原料成本,提升产品的市场竞争力。
具体实施方式
结合实施例对本发明做进一步详述:
首先按照以下步骤制备纤维增强PVC母料:
(1)将200克KH-550型硅烷偶联剂与甲醇按照1:12的比例配制成溶液,置于喷壶中,称取30千克长度为5~8mm的短切竹纤维,配制好的2600克硅烷偶联剂溶液从喷壶中以雾状喷出,均匀喷至短切纤维表面,保证短切纤维充分浸润,最后将浸润纤维置于烘箱中烘干即得偶联剂改性短切玻纤;
(2)称取SG-5型PVC树脂50千克,水滑石体系钙锌稳定剂1.5千克,500目轻质碳酸钙15千克,硬脂酸0.5千克,PE蜡0.6千克,ACR抗冲剂1千克,氯化聚乙烯0.5千克,经偶联剂改性的短切纤维22千克。
(3)将各组分投入混料机中以50转/分钟的速率搅拌均匀,得到絮状的混合料,将混合料在双辊塑炼机上塑炼,双辊塑炼机前辊的温度设定为180℃,后辊的温度设定为160℃,通过调整双辊间距及转速,得到不连续的薄片状纤维增强PVC母料。
下面采用上述纤维纤维增强PVC母料作为原料生产纤维增强高抗冲PVC-U管材。
实施例一
(1)称取SG-5型PVC树脂100千克、短切纤维增强PVC母料30千克,水滑石体系钙锌稳定剂2千克,500目轻质碳酸钙20份,硬脂酸0.5千克,PE蜡1千克。
(2)将各组分投入高速混合机中以120转/分钟的速率搅拌均匀,得到混合料;设定机筒加热温度并开始加热,当所述混合料温度达到90℃时,放入低速冷混搅拌机中以40转/分钟的速率冷混搅拌,当混合料的温度达到35℃时,卸料,并投入螺旋杆挤出机中,在机筒加热温度为175℃、口模温度为165℃、螺杆转速为15转/分钟、加料转速为30转/分钟的条件下,按常规方法依次进行挤出加工成型、真空定形、冷却、牵引、最后进一步冷却至室温后根据所需的长度切断并进行管材扩口即得。
(3)采用本例的配方及工艺制备外径110mm、壁厚4.2mm、公称压力PN1.0的管材,根据《GB/T 10002.1—2006给水用硬聚氯乙烯(PVC—U)管材》和《GB/T 6111—2003流体输送用热塑性塑料管材耐内压试验方法》在20℃恒温、恒湿、3335KPa的恒压条件下检测其耐内压性能,根据《GB/T 10002.1—2006给水用硬聚氯乙烯(PVC—U)管材》和《GB/T14152-2001热塑性塑料管材耐外冲击性能试验方法时针旋转法》,在环境温度为(20±5)℃条件下进行落锤试验检测其抗冲击性能,记录测试结果。
实施例二
(1)称取SG-5型PVC树脂100千克、短切纤维增强PVC母料20千克,水滑石体系钙锌稳定剂2.5千克,500目轻质碳酸钙35份,硬脂酸1千克,PE蜡2千克。
(2)将各组分投入高速混合机中以120转/分钟的速率搅拌均匀,得到混合料;设定机筒加热温度并开始加热,当所述混合料温度达到90℃时,放入低速冷混搅拌机中以40转/分钟的速率冷混搅拌,当混合料的温度达到35℃时,卸料,并投入螺旋杆挤出机中,在机筒加热温度为170℃、口模温度为160℃、螺杆转速为12转/分钟、加料转速为20转/分钟的条件下,按常规方法依次进行挤出加工成型、真空定形、冷却、牵引、最后进一步冷却至室温后根据所需的长度切断并进行管材扩口即得。
(3)采用本例的配方及工艺制备外径110mm、壁厚4.2mm、公称压力PN1.0的管材,根据《GB/T 10002.1—2006给水用硬聚氯乙烯(PVC—U)管材》和《GB/T 6111—2003流体输送用热塑性塑料管材耐内压试验方法》在20℃恒温、恒湿、3335KPa的恒压条件下检测其耐内压性能,根据《GB/T 10002.1—2006给水用硬聚氯乙烯(PVC—U)管材》和《GB/T14152-2001热塑性塑料管材耐外冲击性能试验方法时针旋转法》,在环境温度为(20±5)℃条件下进行落锤试验检测其抗冲击性能,记录测试结果。
表1.试验结果
静液压强度(MPa) | 拉伸强度(MPa) | 断裂伸长率(%) | 冲击强度(KJ/m2) | |
普通管材 | 3.5 | 41.3 | 118.6 | 58.55 |
实例一 | 4.1 | 54.2 | 143.5 | 79.23 |
实例二 | 3.9 | 50.8 | 138.9 | 76.31 |
通过上述表格数据可知,添加纤维增强PVC树脂母料的PVC-U管材静液压强度、拉伸强度、断裂伸长率和冲击强度等性能较普通市售管材得到全面提升,且纤维增强母料添加量越高,性能提升越明显。
以上公开的仅为本申请的几个具体实施例,但本申请并非局限于此,任何无实质创新的变化,都应落在本申请的保护范围内。
Claims (6)
1.本发明公开了一种纤维增强高抗冲PVC-U管材的制备方法,其特征在于制备短切纤维增强PVC母料添加到PVC-U管材中,制备的PVC-U管材具有较高的静液压强度和抗冲击强度。
2.根据权利要求1所述的短切纤维增强PVC母料,其特征在于,它由下述重量份的原料制成:PVC树脂50份,钙锌稳定剂1~2份,轻质碳酸钙5~20份,硬脂酸0.2~0.6份,PE蜡0.4~1.2份,ACR抗冲剂0.5~1.5份,氯化聚乙烯0.4~1份,经偶联剂改性的短切纤维10~25份;
所述PVC树脂为SG-5型;
所述钙锌稳定剂为水滑石体系或沸石体系的固体钙锌稳定剂;
所述轻质碳酸钙的细度要求大于400目;
所述偶联剂为甲氧基型硅烷偶联剂,使用时将其与甲醇配制1:5~20的溶液后对短切纤维进行表面改性;
所述短切纤维长度为5~20mm的玻璃纤维或植物纤维。
3.根据权利要求1所述的短切纤维增强PVC母料的制备方法,包括如下步骤:
(1)首先将甲氧基型硅烷偶联剂与甲醇按照一定比例配制成溶液置于喷壶中,称取一定量的短切纤维,硅烷偶联剂溶液从喷壶中以雾状喷出,均匀喷至短切纤维表面,保证短切纤维充分浸润,最后将浸润纤维置于烘箱中烘干即得偶联剂改性短切玻纤;
(2)按照比例称量各种原料;
(3)将各组分投入混料机中以30~80转/分钟的速率搅拌均匀,得到絮状的混合料,将混合料在双辊塑炼机上塑炼,双辊塑炼机前辊的温度设定为150~200℃,后辊的温度设定为120~180℃,通过调整双辊间距及转速,得到不连续的薄片状纤维增强PVC母料。
4.根据权利要求1所述的纤维增强高抗冲PVC-U管材,其特征在于,组成原料的重量份为:PVC树脂100份、短切纤维增强PVC母料25~35份,钙锌稳定剂1~3份,轻质碳酸钙10~40份,硬脂酸0.5~1份,PE蜡1~2份;
所述PVC树脂为SG-5型;
所述钙锌稳定剂为水滑石体系或沸石体系的固体钙锌稳定剂;
所述轻质碳酸钙的细度要求大于400目。
5.如权利要求1所述的一种纤维增强高抗冲PVC-U管材的制备方法,包括以下步骤:
(1)按按配比称量各种原料;
(2)将各组分投入高速混合机中以100~120转/分钟的速率搅拌均匀,得到混合料;设 定机筒加热温度并开始加热,当所述混合料温度达到85~95℃时,放入低速冷混搅拌机中以20~40转/分钟的速率冷混搅拌,当混合料的温度达到35~45℃时,卸料,并投入螺旋杆挤出机中,在机筒加热温度为150~200℃、口模温度为150~200℃、螺杆转速为5~30转/分钟、加料转速为5~50转/分钟的条件下,按常规方法依次进行挤出加工成型、真空定形、冷却、牵引、最后进一步冷却至室温后根据所需的长度切断并进行管材扩口即得。
6.根据权利要求2-4中任意一项所述的方法制备的纤维增强高抗冲PVC-U管材。
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