CN107020782B - 一种化学发泡法制备的糙面hdpe土工膜及其生产工艺 - Google Patents
一种化学发泡法制备的糙面hdpe土工膜及其生产工艺 Download PDFInfo
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- CN107020782B CN107020782B CN201710116643.6A CN201710116643A CN107020782B CN 107020782 B CN107020782 B CN 107020782B CN 201710116643 A CN201710116643 A CN 201710116643A CN 107020782 B CN107020782 B CN 107020782B
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Abstract
本发明涉及一种化学发泡法制备的糙面HDPE土工膜及其生产工艺。该化学发泡法制备的糙面HDPE土工膜,膜体的表面呈粗糙状,起糙层由高密度聚乙烯、线性低密度聚乙烯、乙丙共聚物、碳酸氢钠、硬脂酸钙、滑石粉、分散剂、炭黑色母粒和抗氧剂制成;非起糙层由高密度聚乙烯、线性低密度聚乙烯和氢化苯乙烯‑丁二烯‑苯乙烯共聚物制成。该化学发泡法制备的糙面HDPE土工膜,发泡组合物以无机发泡剂为主,成本低廉,起泡效果显著,起糙层中添加的乙丙共聚物使得起糙层树脂的熔体强度降低,能产生较高的糙面高度而提高该糙面HDPE土工膜的摩擦系数。此外,该糙面HDPE土工膜的耐环境应力开裂性能好,能及时恢复由于环境影响产生的形变。
Description
技术领域
本发明涉及一种化学发泡法制备的糙面HDPE土工膜及其生产工艺。
背景技术
HDPE土工膜具有较低的渗透系数,已成为防渗工程的主体材料,广泛应用于水利建设、地铁、隧道建设、垃圾填埋场防渗、尾矿库防渗、煤化工蒸发塘等领域。HDPE土工膜分为光面土工膜和糙面土工膜,光面土工膜表面比较平整,匀整度比较好,主要应用在地势平坦、坡度比较小的防渗场地。糙面土工膜的一侧或两侧的表面比较粗糙,具有一定的摩擦系数,主要应用在坡度比较大的防渗场地,像防渗工程的陡边坡等地方。
HDPE糙面土工膜的制备工艺分为一次成型和二次成型。二次成型工艺主要包括轧花成糙法和喷丝成糙法。轧花成糙法是将HDPE光面土工膜经过预热后通过轧花辊轧花,冷却后形成糙面土工膜的方法。喷丝成糙法是将HDPE光面土工膜预热,使所需加糙土工膜面层达到热变形温度以上,通过特殊的喷塑设备喷丝,将熔融状塑料丝喷涂在所需加糙的土工膜表面,经过冷却制得粗糙面层的方法。喷丝工艺难度大,糙面质量不稳定。一次成型工艺包括物理法成糙工艺和化学法成糙工艺。物理法成糙工艺常用的气源是氮气或水分,具体的是将氮气或水分直接与起糙层原料共混,共混后与非起糙层原料一起进入多层共挤模头的不同流道,共同挤出成型。化学发泡成糙法是采用化学发泡剂成泡,使土工膜表面形成一定粗糙度的方法。在需加糙的土工膜原料中添加化学发泡剂,发泡物质与起糙层原料以及非起糙层原料一起进入多层共挤模头的不同流道,实现同时挤出,在挤出过程中,起糙层含有发泡物质分解生成气体形成的气泡,熔体在出模口的瞬间因压力差导致气泡破裂,形成一定的不均匀度,从而形成糙面。
二次成型工艺对土工膜的力学性能影响小,但轧花成糙工艺设备投资大,调整糙面的形状或高度都需要更换轧花辊,得到的土工膜糙面均一且表面易脱落;而现有技术中,一次成型法形成的糙面虽然稳定性好,不易脱落,但在糙面的生产过程中,气泡向非起糙层的挤压,造成力学性能的下降,尤其是断裂伸长率下降明显,会影响到糙面土工膜在使用过程中的耐环境应力开裂性能。
发明内容
本发明为了弥补现有技术的不足,提供了一种糙面稳定且不易脱落、力学性能优良、断裂伸长率高、耐环境应力开裂强的化学发泡法制备的糙面HDPE土工膜及其生产工艺。
本发明是通过如下技术方案实现的:
一种化学发泡法制备的糙面HDPE土工膜,膜体的表面呈粗糙状,起糙层由以下重量份数的原料制成:高密度聚乙烯92-108份、线性低密度聚乙烯12-13份、乙丙共聚物15-24份、碳酸氢钠0.4-0.8份、硬脂酸钙0.05-0.1份、滑石粉0.05-0.1份、分散剂0.09-0.5份、炭黑色母粒5.8-6.3份、抗氧剂1010为0.2-1.2份;非起糙层由以下重量份数的原料制成:高密度聚乙烯92-108份、线性低密度聚乙烯14-16份、氢化苯乙烯-丁二烯-苯乙烯共聚物0.36-0.45份;所述乙丙共聚物中乙烯和丙烯的共聚比例为70:30。
起糙层由以下重量份数的原料制成:高密度聚乙烯100份、线性低密度聚乙烯12.5份、乙丙共聚物19份、碳酸氢钠0.6份、硬脂酸钙0.07份、滑石粉0.07份、分散剂0.5份、炭黑色母粒6.0份、抗氧剂1010为0.2份;非起糙层由以下重量份数的原料制成:高密度聚乙烯100份、线性低密度聚乙烯15份、氢化苯乙烯-丁二烯-苯乙烯共聚物0.4份。
所述高密度聚乙烯的熔融指数为0.1g/10min;所述线性低密度聚乙烯的熔融指数为1.0g/10min;所述乙丙共聚物的熔融指数为3.1g/10min;所述碳酸氢钠为工业级,粒径为200-250目;所述硬脂酸钙为工业级,粒径为200-250目;所述滑石粉为工业级,粒径为1250-1500目;所述分散剂为石蜡油,粘度为20℃下150mPa·s;所述炭黑色母粒的炭黑含量为45%;所述氢化苯乙烯-丁二烯-苯乙烯共聚物的硬度为邵氏硬度70A。
所述化学发泡法制备的糙面HDPE土工膜的生产工艺,采用如下步骤:
(1)称取上述重量份数的碳酸氢钠、硬脂酸钙和滑石粉,置于高速混合机中,在1000r/min转速下混合均匀,混合时间为8-10分钟,得发泡起糙混合物;
(2)称取上述重量份数的高密度聚乙烯、线性低密度聚乙烯和乙丙共聚物、氢化苯乙烯-丁二烯-苯乙烯共聚物、炭黑色母粒和抗氧剂1010,混合均匀,得基础层土工膜混合物;
(3)将步骤(2)所得基础层土工膜混合物置于三层共挤吹塑机中层螺杆中,同时在三层共挤吹塑机的内层螺杆和外层螺杆内分别加入步骤(1)所得发泡起糙混合物和分散剂,挤出成型,即得糙面HDPE土工膜。
所述高密度聚乙烯的熔融指数为0.1g/10min;所述线性低密度聚乙烯的熔融指数为1.0g/10min;所述乙丙共聚物的熔融指数为3.1g/10min;所述碳酸氢钠为工业级,粒径为200-250目;所述硬脂酸钙为工业级,粒径为200-250目;所述滑石粉为工业级,粒径为1250-1500目;所述分散剂为石蜡油,粘度为20℃下150mPa·s;所述炭黑色母粒的炭黑含量为45%;所述氢化苯乙烯-丁二烯-苯乙烯共聚物的硬度为邵氏硬度70A。
本发明所用的各原料的性能如下:
高密度聚乙烯:高密度聚乙烯简称为HDPE,又称低压聚乙烯,是一种结晶度高、非极性的热塑性树脂,为白色粉末颗粒状。具有良好的耐热性和耐寒性,化学稳定性好,还具有较高的刚性和韧性,机械强度好,介电性能好,耐环境应力开裂性亦较好。
线性低密度聚乙烯:线性低密度聚乙烯简称为LLDPE,为无毒无味无臭的乳白色颗粒,与LDPE相比,具有较高的软化温度和熔融温度,有强度大、韧性好、刚性大、耐热、耐寒性好等优点,还具有良好的耐环境应力开裂性,耐冲击强度、耐撕裂强度等性能,并可耐酸、碱、有机溶剂等,广泛用于工业、农业、医药、卫生和日常生活用品等领域。本发明所使用的线性低密度聚乙烯的生产方法为:以乙烯为主要原料,以少量α-烯烃(如丁烯-1、辛烯-1等),在催化剂作用下经高压或低压进行气相流化床聚合,反应出来的物料经造粒、干燥、包装而成。
乙丙共聚物:乙丙共聚物简称OCP,为乙烯、丙烯的共聚物,是一种润滑油粘度指数改进剂。聚乙烯树脂的熔体强度高,气泡容易向非起糙层挤压,聚丙烯树脂的熔体强度低,气泡容易形成糙面,乙丙共聚物同时包含乙烯结构单元和丙烯结构单元,具有良好的热稳定性和化学稳定性,增粘能力和剪切稳定性较好,能有效改进油品粘度指数,对润滑油降凝剂感受性良好。
氢化苯乙烯-丁二烯-苯乙烯共聚物:氢化苯乙烯-丁二烯-苯乙烯共聚物简称SEBS,是热塑性苯乙烯-丁二烯-苯乙烯共聚物(SBS)分子中橡胶段聚丁二烯不饱和双键经过选择加氢而制得的新型改性热塑性弹性体。SEBS不含不饱和双键,具有良好的稳定性和耐老化性。SEBS为热塑性弹性体,具有较好的弹性,同时能够热塑性加工,在高低温差存在时,能够及时恢复由于环境影响产生的形变,具有较好的耐高低温性能。在本发明中按一定比例添加到非起糙层HDPE树脂中,可增韧HDPE树脂,能够改善其耐环境应力开裂性能。
碳酸氢钠:碳酸氢钠俗称小苏打,为白色细小晶体,固体50℃以上开始逐渐分解生成碳酸钠、二氧化碳和水,270℃时完全分解。碳酸氢钠常用作分析试剂、无机合成、制药工业、治疗酸血症以及食品工业的发酵剂、汽水和冷饮中二氧化碳的发生剂、黄油的保存剂。
硬脂酸钙:硬脂酸钙为白色粉末,由氯化钙与硬脂酸和棕榈酸钠盐的混合物反应,用水洗涤去除氯化钠得到。不溶于水,冷的乙醇和乙醚,溶于热苯、苯和松节油等有机溶剂,微溶于热的乙醇和乙醚。有吸湿性,常用作稳定剂、润滑剂、油漆平光剂、铅笔芯的润滑剂、塑料脱模剂、建筑防水剂、润滑油的增稠剂、聚丙烯和聚乙烯的卤素吸收剂。
滑石粉:滑石粉为白色或类白色、微细、无砂性的粉末,手摸有油腻感。主要成分为含水硅酸镁,经粉碎后,用盐酸处理,水洗,干燥而成,在水、稀矿酸或稀氢氧化碱溶液中均不溶解。用于橡胶、塑料、油漆、等化工行业作为强化改质填充剂。能够增加产品形状的稳定,增加张力强度、剪切强度、挠曲强度、压力强度,降低变形、伸张率、热膨胀系数,白度高、粒度均匀、分散性强。
分散剂:分散剂是一种在分子内同时具有亲油性和亲水性两种相反性质的界面活性剂。可均一分散那些难于溶解于液体的无机,有机颜料的固体及液体颗粒,同时也能防止颗粒的沉降和凝聚,形成安定悬浮液所需的两亲性试剂。本发明中使用的分散剂为石蜡油,是从原油分馏中所得到的无色无味的混合物。
炭黑色母粒:炭黑色母粒是由炭黑、载体和助剂注塑等工序环节中所生产的色母原料,适用于大部分热性树脂注塑、抽粒、压板、吹膜、线材、管材等工艺。炭黑色母粒环保无烟、无毒无味,产品表面光滑亮泽和实色颜色稳定,韧性好,不会出现色点和色纹等现象,既降低成本,又减少厂房场地污染。
抗氧剂:抗氧剂是一类化学物质,当其在聚合物体系中仅少量存在时就可延缓或抑制聚合物氧化过程的进行,从而阻止聚合物的老化并延长其使用寿命。在本发明中抗氧剂可以防止某些聚合物加工过程中的热氧化降解,使其成型加工能顺利进行。
本发明一种化学发泡法制备的糙面HDPE土工膜的诸原料的作用机理
本发明的起糙层选取高密度聚乙烯和线性低密度聚乙烯的混合物为起糙层混合树脂,发泡组合物选用碳酸氢钠、硬脂酸钙、滑石粉和分散剂,其中碳酸氢钠为气源产生物质,碳酸氢钠为发泡活性剂,滑石粉为气泡成核助剂,碳酸氢钠在受热分解时会产生二氧化碳气体和气态的水分(水分在加工温度下也是气态),硬脂酸钙能够促进碳酸氢钠的分解,碳酸氢钠产生的气体在气泡成核助剂滑石粉的作用下,形成一个个气泡而包裹在起糙层混合树脂的熔体内。而且起糙层树脂的熔体强度对糙面层的形成有很大的影响,熔体强度太大时气泡会向中间的非起糙层挤压而破坏非起糙层的力学性能,熔体强度太小时起糙层树脂的熔体包裹不住气泡而不利于气泡的长大,使得形成的起糙层的糙面高度不够。为了获得强度适中的熔体强度,本发明在起糙层混合树脂中添加了一定量的乙丙共聚物作为起糙层混合树脂的熔体强度调节剂,乙丙共聚物熔体强度低,同时包含乙烯结构单元和丙烯结构单元,在施工焊接时能够和聚乙烯结构的基材有较好的焊接性,这样既能调节起糙层的熔体强度,使得起糙层能够形成较好的糙面,又能保证后期施工时起糙层与非起糙层的有效焊接。制备物中添加了炭黑色母粒和抗氧剂1010,能够延缓材料的老化,保证工程的使用寿命。
非起糙层选取高密度聚乙烯和线性低密度聚乙烯的混合物为非起糙层混合树脂,为了增加该糙面HDPE土工膜的力学性能和耐环境应力开裂性能,选取了热塑性弹性体—氢化苯乙烯-丁二烯-苯乙烯共聚物对该非起糙层进行有效改性,氢化苯乙烯-丁二烯-苯乙烯共聚物不含不饱和双键,具有良好的稳定性、耐老化性和较好的弹性,同时具有较好的耐高低温性能,在高低温差存在时,能够及时恢复由于环境影响产生的形变。本发明中将氢化苯乙烯-丁二烯-苯乙烯共聚物按一定比例添加到非起糙层混合树脂中,能够有效改善该糙面HDPE土工膜的耐环境应力开裂性能。
本发明化学发泡法制备的糙面HDPE土工膜的有益效果:该化学发泡法制备的糙面HDPE土工膜,发泡组合物以无机发泡剂为主,以碳酸氢钠为气源产生物质,以硬脂酸钙为发泡活性剂,以滑石粉为气泡成核助剂,成本低廉,起泡效果显著,其中碳酸氢钠发泡剂发气量大,且硬脂酸钙能够促进碳酸氢钠的分解,产生的气体在滑石粉的作用下利于起泡长大。起糙层中添加的乙丙共聚物使得起糙层树脂的熔体强度降低,在起糙层和非起糙层的模口处由于压强差的作用,气泡容易发生破裂,形成粗糙面层;同时起泡不会向非起糙层挤压,对非起糙层力学性能的影响减少,同时可产生较高的糙面高度,提高了该糙面HDPE土工膜的摩擦系数。在非起糙层树脂中添加了氢化苯乙烯-丁二烯-苯乙烯共聚物作为耐环境应力开裂改性剂,使得该糙面HDPE土工膜在高低温差存在时能够及时恢复由于环境影响产生的形变,具有较好的耐高低温性能,有利于非起糙层树脂耐环境应力开裂性能的改善。
具体实施方式
实施例1:一种化学发泡法制备的糙面HDPE土工膜,取下述重量份数的原料制备而成(每份取35kg):起糙层由以下重量份数的原料制成:高密度聚乙烯92份、线性低密度聚乙烯12份、乙丙共聚物15份、碳酸氢钠0.4份、硬脂酸钙0.05份、滑石粉0.05份、分散剂0.09份、炭黑色母粒5.8份、抗氧剂1010为0.2份;非起糙层由以下重量份数的原料制成:高密度聚乙烯92份、线性低密度聚乙烯14份、氢化苯乙烯-丁二烯-苯乙烯共聚物0.36份。
上述化学发泡法制备的糙面HDPE土工膜的生产工艺,步骤如下:
(1)称取上述重量份数的碳酸氢钠、硬脂酸钙和滑石粉,置于高速混合机中,在1000r/min转速下混合均匀,混合时间为8-10分钟,得发泡起糙混合物;
(2)称取上述重量份数的高密度聚乙烯、线性低密度聚乙烯和乙丙共聚物、氢化苯乙烯-丁二烯-苯乙烯共聚物、炭黑色母粒和抗氧剂1010,混合均匀,得基础层土工膜混合物;
(3)将步骤(2)所得基础层土工膜混合物置于三层共挤吹塑机中,同时在三层共挤吹塑机的内层螺杆和外层螺杆内分别加入步骤(1)所得发泡起糙混合物和分散剂,通过螺杆熔融后在口膜处挤出形成筒膜、通过侧吹风形成吹胀比、通过牵引装置形成牵引、风环冷却定型、卷绕后成卷;所述螺杆温度为155℃-185℃,七个加热区逐渐升温,连接管温度为187℃,机头温度为148-158℃,二十五个加热区逐渐升温;内层螺杆主机频率为7.66r/min、中层螺杆主机频率为40.23r/min、外层螺杆主机频率为7.66r/min;进风频率为16HZ,进风转速为970rpm,出风频率为29HZ,出风转速为1700rpm;上牵引频率为3.64r/min,二道牵引频率为3.74r/min,三道牵引频率为6.78r/min,卷绕频率为6.78r/min。
实施例2:一种化学发泡法制备的糙面HDPE土工膜,取下述重量份数的原料制备而成(每份取20kg):起糙层由以下重量份数的原料制成:高密度聚乙烯108份、线性低密度聚乙烯13份、乙丙共聚物24份、碳酸氢钠0.8份、硬脂酸钙0.1份、滑石粉0.1份、分散剂0.5份、炭黑色母粒6.3份、抗氧剂1010为1.2份;非起糙层由以下重量份数的原料制成:高密度聚乙烯108份、线性低密度聚乙烯16份、氢化苯乙烯-丁二烯-苯乙烯共聚物0.45份。
上述化学发泡法制备的糙面HDPE土工膜的生产工艺,步骤如下:
(1)称取上述重量份数的碳酸氢钠、硬脂酸钙和滑石粉,置于高速混合机中,在1000r/min转速下混合均匀,混合时间为8-10分钟,得发泡起糙混合物;
(2)称取上述重量份数的高密度聚乙烯、线性低密度聚乙烯和乙丙共聚物、氢化苯乙烯-丁二烯-苯乙烯共聚物、炭黑色母粒和抗氧剂1010,混合均匀,得基础层土工膜混合物;
(3)将步骤(2)所得基础层土工膜混合物置于三层共挤吹塑机中,同时在三层共挤吹塑机的内层螺杆和外层螺杆内分别加入步骤(1)所得发泡起糙混合物和分散剂,通过螺杆熔融后在口膜处挤出形成筒膜、通过侧吹风形成吹胀比、通过牵引装置形成牵引、风环冷却定型、卷绕后成卷;所述螺杆温度为155℃-185℃,七个加热区逐渐升温,连接管温度为187℃,机头温度为148-158℃,二十五个加热区逐渐升温;内层螺杆主机频率为7.66r/min、中层螺杆主机频率为40.23r/min、外层螺杆主机频率为7.66r/min;进风频率为16HZ,进风转速为970rpm,出风频率为29HZ,出风转速为1700rpm;上牵引频率为3.64r/min,二道牵引频率为3.74r/min,三道牵引频率为6.78r/min,卷绕频率为6.78r/min。
实施例3:一种化学发泡法制备的糙面HDPE土工膜,取下述重量份数的原料制备而成(每份取28kg):起糙层由以下重量份数的原料制成:高密度聚乙烯96份、线性低密度聚乙烯12.3份、乙丙共聚物17份、碳酸氢钠0.5份、硬脂酸钙0.06份、滑石粉0.06份、分散剂0.2份、炭黑色母粒5.9份、抗氧剂1010为0.5份;非起糙层由以下重量份数的原料制成:高密度聚乙烯96份、线性低密度聚乙烯14.5份、氢化苯乙烯-丁二烯-苯乙烯共聚物0.39份。
上述化学发泡法制备的糙面HDPE土工膜的生产工艺,步骤如下:
(1)称取上述重量份数的碳酸氢钠、硬脂酸钙和滑石粉,置于高速混合机中,在1000r/min转速下混合均匀,混合时间为8-10分钟,得发泡起糙混合物;
(2)称取上述重量份数的高密度聚乙烯、线性低密度聚乙烯和乙丙共聚物、氢化苯乙烯-丁二烯-苯乙烯共聚物、炭黑色母粒和抗氧剂1010,混合均匀,得基础层土工膜混合物;
(3)将步骤(2)所得基础层土工膜混合物置于三层共挤吹塑机中,同时在三层共挤吹塑机的内层螺杆和外层螺杆内分别加入步骤(1)所得发泡起糙混合物和分散剂,通过螺杆熔融后在口膜处挤出形成筒膜、通过侧吹风形成吹胀比、通过牵引装置形成牵引、风环冷却定型、卷绕后成卷;所述螺杆温度为155℃-185℃,七个加热区逐渐升温,连接管温度为187℃,机头温度为148-158℃,二十五个加热区逐渐升温;内层螺杆主机频率为7.66r/min、中层螺杆主机频率为40.23r/min、外层螺杆主机频率为7.66r/min;进风频率为16HZ,进风转速为970rpm,出风频率为29HZ,出风转速为1700rpm;上牵引频率为3.64r/min,二道牵引频率为3.74r/min,三道牵引频率为6.78r/min,卷绕频率为6.78r/min。
实施例4:一种化学发泡法制备的糙面HDPE土工膜,取下述重量份数的原料制备而成(每份取15kg):起糙层由以下重量份数的原料制成:高密度聚乙烯105份、线性低密度聚乙烯12.7份、乙丙共聚物22份、碳酸氢钠0.7份、硬脂酸钙0.09份、滑石粉0.09份、分散剂0.4份、炭黑色母粒6.1份、抗氧剂1010为0.9份;非起糙层由以下重量份数的原料制成:高密度聚乙烯105份、线性低密度聚乙烯15.5份、氢化苯乙烯-丁二烯-苯乙烯共聚物0.43份。
制备方法同实施例3。
实施例5:一种化学发泡法制备的糙面HDPE土工膜,取下述重量份数的原料制备而成(每份取30kg):起糙层由以下重量份数的原料制成:高密度聚乙烯100份、线性低密度聚乙烯12.5份、乙丙共聚物19份、碳酸氢钠0.6份、硬脂酸钙0.07份、滑石粉0.07份、分散剂0.5份、炭黑色母粒6.0份、抗氧剂1010为0.2份;非起糙层由以下重量份数的原料制成:高密度聚乙烯100份、线性低密度聚乙烯15份、氢化苯乙烯-丁二烯-苯乙烯共聚物0.4份。
制备方法同实施例3。
试验例
针对本发明所得化学发泡法制备的糙面HDPE土工膜,发明人做了技术性能指标测定的对比试验。
对比试验分为实验组和对照组,实验组的测定对象为本发明所得化学发泡法制备的糙面HDPE土工膜,从本发明所得化学发泡法制备的糙面HDPE土工膜(实施例1-5)中随机抽取作为试样,进行技术性能指标的测定;对照组的测定对象为现有技术中的糙面HDPE土工膜(由约97.5%高品质聚乙烯、2.5%的炭黑、微量的抗氧化和热稳定剂制成的厚度为1.5mm的糙面HDPE土工膜,购自仪征市东利建筑材料有限公司),随机抽取作为试样,同等条件下也进行技术性能指标的测定。
根据中华人民共和国国家标准GB/T 17643-2011“土工合成材料聚乙烯土工膜”的相关规定,关于厚度为1.5mm的糙面高密度聚乙烯土工膜的技术性能指标的要求为:毛糙高度≥0.25mm,纵/横向拉伸屈服强度≥22N/mm,纵/横向拉伸断裂强度≥16N/mm,纵/横向屈服伸长率≥12%,纵/横向断裂伸长率≥100%,拉伸负荷应力开裂(切口横载拉伸法)≥300h。
毛糙高度按照GB/T 17643-2011附录B中规定的方法进行;纵/横向拉伸屈服强度按照GB/T1040.3规定进行,试验速度为50mm/min±5mm/min;纵/横向拉伸断裂强度按照GB/T1040.3规定进行,试验速度为50mm/min±5mm/min;纵/横向屈服伸长率按照GB/T1040.3规定进行,试验速度为50mm/min±5mm/min;纵/横向断裂伸长率按照GB/T1040.3规定进行,试验速度为50mm/min±5mm/min;拉伸负荷应力开裂(切口横载拉伸法)按照GB/T 17643-2011附录D中规定的方法进行。每种指标的测定实验分别进行4次,并分别求平均值,具体情况如表1所示
表1具体技术性能指标情况
由表1并结合相关国家标准GB/T 17643-2011的规定可以看出,本发明所得化学发泡法制备的糙面HDPE土工膜的毛糙高度、纵/横向拉伸屈服强度、纵/横向拉伸断裂强度、纵/横向屈服伸长率、纵/横向断裂伸长率、拉伸负荷应力开裂(切口横载拉伸法)均比国家标准GB/T17643-2011中的固定值有明显提高,比如实施例1所得化学发泡法制备的糙面HDPE土工膜的毛糙高度为0.50mm、纵/横向拉伸屈服强度分别为27.93N/mm和27.02N/mm、纵/横向拉伸断裂强度分别为35.52N/mm和26.36N/mm、纵/横向屈服伸长率分别为12.1%和12.0%、纵/横向断裂伸长率分别为755%和651%、拉伸负荷应力开裂(切口横载拉伸法)为805h,远比国家标准规定的标准高。
由表1可以看出,本发明所得化学发泡法制备的糙面HDPE土工膜的毛糙高度、纵/横向拉伸屈服强度、纵/横向拉伸断裂强度、纵/横向屈服伸长率、纵/横向断裂伸长率、拉伸负荷应力开裂(切口横载拉伸法)均比现有技术中的糙面HDPE土工膜的毛糙高度、纵/横向拉伸屈服强度、纵/横向拉伸断裂强度、纵/横向屈服伸长率、纵/横向断裂伸长率、拉伸负荷应力开裂(切口横载拉伸法)高。具体的,以实施例5所得化学发泡法制备的糙面HDPE土工膜与对照组的糙面HDPE土工膜相比较,实施例5所得糙面HDPE土工膜的毛糙高度为1.12mm、纵/横向拉伸屈服强度分别为27.96N/mm和27.05N/mm、纵/横向拉伸断裂强度分别为29.87N/mm和25.03N/mm、纵/横向屈服伸长率分别为12.3%和12.2%、纵/横向断裂伸长率分别为680%和567%、拉伸负荷应力开裂(切口横载拉伸法)为689h,而对照组的糙面HDPE土工膜的毛糙高度为0.46mm、纵/横向拉伸屈服强度分别为22.12N/mm和21.92N/mm、纵/横向拉伸断裂强度分别为18.68N/mm和17.21N/mm、纵/横向屈服伸长率分别为11.2%和11.4%、纵/横向断裂伸长率分别为279%和265%、拉伸负荷应力开裂(切口横载拉伸法)为450h。
综上可知,本发明所得化学发泡法制备的糙面HDPE土工膜不但能够满足国家标准的相关要求,而且比现有技术中的糙面HDPE土工膜的性能更加优良,市场应用前景广阔。
最后应说明的是,实施例只是本发明最优的具体实施方式而已,并不用于限制本发明,尽管参照前述实施例对本发明进行了详细的说明,对于本领域的技术人员来说,其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分技术特征进行等同替换。凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。
Claims (3)
1.一种化学发泡法制备的糙面HDPE土工膜,膜体的表面呈粗糙状,其特征是:起糙层由以下重量份数的原料制成:高密度聚乙烯92-108份、线性低密度聚乙烯12-13份、乙丙共聚物15-24份、碳酸氢钠0.4-0.8份、硬脂酸钙0.05-0.1份、滑石粉0.05-0.1份、分散剂0.09-0.5份、炭黑色母粒5.8-6.3份、抗氧剂1010为0.2-1.2份;非起糙层由以下重量份数的原料制成:高密度聚乙烯92-108份、线性低密度聚乙烯14-16份、氢化苯乙烯-丁二烯-苯乙烯共聚物0.36-0.45份;所述乙丙共聚物中乙烯和丙烯的共聚比例为70:30。
2.根据权利要求1所述的化学发泡法制备的糙面HDPE土工膜,其特征是:起糙层由以下重量份数的原料制成:高密度聚乙烯100份、线性低密度聚乙烯12.5份、乙丙共聚物19份、碳酸氢钠0.6份、硬脂酸钙0.07份、滑石粉0.07份、分散剂0.5份、炭黑色母粒6.0份、抗氧剂1010为0.2份;非起糙层由以下重量份数的原料制成:高密度聚乙烯100份、线性低密度聚乙烯15份、氢化苯乙烯-丁二烯-苯乙烯共聚物0.4份。
3.根据权利要求1-2任一所述的化学发泡法制备的糙面HDPE土工膜,其特征是:所述高密度聚乙烯的熔融指数为0.1g/10min;所述线性低密度聚乙烯的熔融指数为1.0g/10min;所述乙丙共聚物的熔融指数为3.1g/10min;所述碳酸氢钠为工业级,粒径为200-250目;所述硬脂酸钙为工业级,粒径为200-250目;所述滑石粉为工业级,粒径为1250-1500目;所述分散剂为石蜡油,粘度为20℃下150mPa·s;所述炭黑色母粒的炭黑含量为45%;所述氢化苯乙烯-丁二烯-苯乙烯共聚物的硬度为邵氏硬度70A。
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