CN103910936B - 一种聚丙烯/三元乙丙橡胶复合材料及其制备方法 - Google Patents
一种聚丙烯/三元乙丙橡胶复合材料及其制备方法 Download PDFInfo
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Abstract
本发明涉及一种聚丙烯/三元乙丙橡胶复合材料及其制备方法,由聚丙烯(PP)50‑80份、三元乙丙橡胶(EPDM)50‑80份、乙烯辛烯嵌段共聚物(OBC)5份‑15份、抗氧剂0.1‑0.5份经过混合、挤出造粒、水冷、切粒及干燥等步骤制备而成。PP和EPDM共混物是一种在工业上广泛应用的热塑性弹性体。尽管在两者的重复单元中,有部分结构相似,但PP和EPDM并不相容。为了增强两组分的相容性,本发明加入的OBC作为PP/EPDM两相体系聚合物的表面活性剂,增强两相界面间作用力,并可以增加PP的晶核密度及结晶速率,提高材料的力学性能。
Description
技术领域
本发明涉及热塑性弹性体的高分子材料技术领域,尤其涉及一种聚丙烯/三元乙丙橡胶复合材料及其制备方法。
背景技术
为了增强聚丙烯(PP)的韧性,最简单有效的也是广泛被使用的方法就是将PP和其它弹性体共混进行改性。这种弹性体包含乙丙橡胶(EPR),三元乙丙橡胶(EPDM)及苯乙烯—乙烯—苯乙烯嵌段共聚物(SEBS)。
近年来, PP和EPDM物理共混制备的热塑性弹性体在工业上得到广泛的应用,但是PP和EPDM之间的界面结合力和相容性均较差,这极大的影响了改性PP材料的性质,并限制了其应用。
乙烯辛烯嵌段共聚物(OBC)是陶氏化学公司研究开发的一种新颖的乙烯辛烯嵌段共聚物,由于OBC的硬段乙烯含量高,可以结晶,并具有更高的熔融温度;而软段中辛烯含量高,不具备结晶能力,却具有较低的玻璃化转变温度。
发明内容
本发明的目的在于提供了一种聚丙烯/三元乙丙橡胶复合材料及其制备方法,该复合材料的制备方法简单易行,且使得制得的复合材料具有良好的力学性能。
本发明的目的可以通过以下技术方案来实现:
一种聚丙烯/三元乙丙橡胶复合材料,其特征在于:由下述组分按重量份制备而成:
聚丙烯(PP) 50份-80份
三元乙丙橡胶(EPDM) 50份-80份
乙烯辛烯嵌段共聚物(OBC) 5份-15份
抗氧剂 0.1份-0.5份。
所述的三元乙丙橡胶中乙烯含量为70%。
所述的抗氧剂为四[β-(3,5-二叔丁基-4-羟基苯基)丙酸]季戊四醇酯与三(2,4-二叔丁基苯基)亚磷酸酯按质量比为1:1混合而成。
本发明的另一个目的是提供一种上述聚丙烯/三元乙丙橡胶复合材料的制备方法,包括以下步骤:
(1)将聚丙烯、三元乙丙橡胶及乙烯辛烯嵌段共聚物分别在80~120℃下干燥烘干8~12小时;
(2)将干燥处理后的聚丙烯、三元乙丙橡胶、乙烯辛烯嵌段共聚物及抗氧剂一起通过高速混合机搅拌10~12分钟,形成混合物料;
(3)将混合好的混合物料投入到双螺杆挤出机的料斗中,经熔融、挤出造粒、水冷、切粒及干燥既得产品。
所述的双螺杆挤出机包含六个区,其中各区温度及螺杆转速分别为:
一区温度70~100℃,二区温度180~220℃,三区温度180~230℃,四区温度180~230℃,五区温度180~230℃,六区温度180~230℃,机头温度180~230℃;螺杆转速180~300r/min。
本发明的有益效果:
1.本发明加入的OBC是作为PP/EPDM两相体系聚合物的表面活性剂,其与PP及EPDM都有很好的相容性,从而增强PP及EPDM两相界面间作用力。
2. 由于OBC的硬段乙烯含量高,可以结晶,并具有更高的熔融温度;而软段中辛烯含量高,不具备结晶能力,却具有较低的玻璃化转变温度。所以OBC的加入还可以增加PP的晶核密度及结晶速率;并且OBC的软段同PP具有更好的相容性,提高PP改性材料的力学性能。
具体实施方式
下面结合具体的实施例对本发明做一详细的阐述。
实施例1
(1)将聚丙烯、三元乙丙橡胶及乙烯辛烯嵌段共聚物分别在80℃下干燥烘干8小时;
(2)将干燥处理后的聚丙烯50份、三元乙丙橡胶50份、乙烯辛烯嵌段共聚物5份及四[β-(3,5-二叔丁基-4-羟基苯基)丙酸]季戊四醇酯0.05份、三(2,4-二叔丁基苯基)亚磷酸酯0.05份一起通过高速混合机搅拌10分钟,形成混合物料;
(3)将混合好的混合物料投入到双螺杆挤出机的料斗中,经熔融、挤出造粒、水冷、切粒及干燥既得产品。
其中挤出机各区温度及螺杆转速分别为:一区温度70,二区温度180℃,三区温度180℃,四区温度180℃,五区温度180℃,六区温度180℃,机头温度180℃;螺杆转速180r/min。
实施例2
(1)将聚丙烯、三元乙丙橡胶及乙烯辛烯嵌段共聚物分别在120℃下干燥烘干12小时;
(2)将干燥处理后的聚丙烯80份、三元乙丙橡胶80份、乙烯辛烯嵌段共聚物15份及四[β-(3,5-二叔丁基-4-羟基苯基)丙酸]季戊四醇酯0.25份、三(2,4-二叔丁基苯基)亚磷酸酯0.25份一起通过高速混合机搅拌12分钟,形成混合物料;
(3)将混合好的混合物料投入到双螺杆挤出机的料斗中,经熔融、挤出造粒、水冷、切粒及干燥既得产品。
其中挤出机各区温度及螺杆转速分别为:一区温度80,二区温度200℃,三区温度200℃,四区温度200℃,五区温度200℃,六区温度200℃,机头温度200℃;螺杆转速200r/min。
实施例3
(1)将聚丙烯、三元乙丙橡胶及乙烯辛烯嵌段共聚物分别在100℃下干燥烘干10小时;
(2)将干燥处理后的聚丙烯65份、三元乙丙橡胶65份、乙烯辛烯嵌段共聚物10份及四[β-(3,5-二叔丁基-4-羟基苯基)丙酸]季戊四醇酯0.15份、三(2,4-二叔丁基苯基)亚磷酸酯0.15份一起通过高速混合机搅拌11分钟,形成混合物料;
(3)将混合好的混合物料投入到双螺杆挤出机的料斗中,经熔融、挤出造粒、水冷、切粒及干燥既得产品。
其中挤出机各区温度及螺杆转速分别为:一区温度100,二区温度220℃,三区温度230℃,四区温度230℃,五区温度230℃,六区温度230℃,机头温度230℃;螺杆转速300r/min。
实施例4
(1)将聚丙烯、三元乙丙橡胶及乙烯辛烯嵌段共聚物分别在110℃下干燥烘干11小时;
(2)将干燥处理后的聚丙烯70份、三元乙丙橡胶70份、乙烯辛烯嵌段共聚物13份及四[β-(3,5-二叔丁基-4-羟基苯基)丙酸]季戊四醇酯0.2份、三(2,4-二叔丁基苯基)亚磷酸酯0.2份一起通过高速混合机搅拌10分钟,形成混合物料;
(3)将混合好的混合物料投入到双螺杆挤出机的料斗中,经熔融、挤出造粒、水冷、切粒及干燥既得产品。
其中。挤出机各区温度及螺杆转速分别为:一区温度95,二区温度215℃,三区温度215℃,四区温度215℃,五区温度215℃,六区温度215℃,机头温度225℃;螺杆转速280r/min。
对比例
取聚丙烯(PP)50份、三元乙丙橡胶(EPDM)50份、四[β-(3,5-二叔丁基-4-羟基苯基)丙酸]季戊四醇酯0.2份、三(2,4-二叔丁基苯基)亚磷酸酯0.2份。将称好的PP、EPDM在90℃下干燥烘干8小时;将干燥处理后的PP、EPDM及抗氧剂,通过高速混合机搅拌10分钟,形成混合物料;将混合好的混合物料投入到双螺杆挤出机的料斗中,经熔融反应,挤出造粒、水冷、切粒及干燥等步骤。挤出机各区温度及螺杆转速分别为:一区温度95,二区温度215℃,三区温度215℃,四区温度215℃,五区温度215℃,六区温度215℃,机头温度225℃;螺杆转速290r/min。
将实施例1-5与对比例制备的聚丙烯/三元乙丙橡胶复合材料分别制成样条进行对比,根据标准ASTMD790、ASTMD882和ASTMD790分别对其进行拉伸强度、断链伸长率、弯曲模量测试,测试数据如下表:
表1 各实施例产品性能测试
测试项目 | 测试标准 | 单位 | 实施例1 | 实施例2 | 实施例3 | 实施例4 | 对比例 |
拉伸强度 | ASTMD790 | MPa | 35.4 | 38.1 | 40 | 37.7 | 20 |
断链伸长率 | ASTMD882 | % | 970 | 950 | 1010 | 1025 | 450 |
弯曲模量 | ASTMD790 | MPa | 340 | 330 | 350 | 370 | 290 |
通过上表可以发现OBC的加入增强了PP/EPDM两相界面间作用力,增加PP的晶核密度及结晶速率,提高了材料的力学性能;实施例1与对比例相比,其拉伸强度、断链伸长率、弯曲模量分别增加15.4 MPa、520%、50 MPa。从而提高了聚丙烯/三元乙丙橡胶复合材料的性能,并大大扩展了聚丙烯三元乙丙橡胶复合材料的应用领域,具有非常重要的现实意义。
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,任何本领域的技术人员能思之的变化,都应落在本申请的保护范围内。
Claims (5)
1.一种聚丙烯/三元乙丙橡胶复合材料,其特征在于:由下述组分按重量份制备而成:
聚丙烯 50份-80份
三元乙丙橡胶 50份-80份
乙烯辛烯嵌段共聚物 5份-15份
抗氧剂 0.1份-0.5份。
2.根据权利要求1所述的一种聚丙烯/三元乙丙橡胶复合材料,其特征在于:所述的三元乙丙橡胶中乙烯含量为70%。
3.根据权利要求1所述的一种聚丙烯/三元乙丙橡胶复合材料,其特征在于:所述的抗氧剂为四[β-(3,5-二叔丁基-4-羟基苯基)丙酸]季戊四醇酯与三(2,4-二叔丁基苯基)亚磷酸酯按质量比为1:1混合而成。
4.一种如权利要求1所述的聚丙烯/三元乙丙橡胶复合材料的制备方法,其特征在于:包括以下步骤:
(1)将聚丙烯、三元乙丙橡胶及乙烯辛烯嵌段共聚物分别在80~120℃下干燥烘干8~12小时;
(2)将干燥处理后的聚丙烯、三元乙丙橡胶、乙烯辛烯嵌段共聚物及抗氧剂一起通过高速混合机搅拌10~12分钟,形成混合物料;
(3)将混合好的混合物料投入到双螺杆挤出机的料斗中,经熔融、挤出造粒、水冷、切粒及干燥既得产品。
5.根据权利要求4所述的制备方法,其特征在于:所述的双螺杆挤出机包含六个区,其中各区温度及螺杆转速分别为:
一区温度70~100℃,二区温度180~220℃,三区温度180~230℃,四区温度180~230℃,五区温度180~230℃,六区温度180~230℃,机头温度180~230℃;螺杆转速180~300r/min。
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