CN110528788A - 一种防水卷材用pvdf复合tpo耐晒抗老化复合膜及制备方法 - Google Patents
一种防水卷材用pvdf复合tpo耐晒抗老化复合膜及制备方法 Download PDFInfo
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Abstract
本发明公开了一种防水卷材用PVDF复合TPO耐晒抗老化复合膜及制备方法,复合膜由依次设置的PVDF膜、胶水层、TPO层、粘合胶层和离型层构成,其中:所述PVDF膜的厚度为0.015~0.025mm,宽度为860mm~1920mm;所述胶水层的厚度为0.0003~0.0005mm,宽度为860mm~1920mm;所述TPO层的厚度为2~5mm,宽度为900mm~1100mm;所述粘合胶层的厚度为1~2mm,宽度为1060mm~2120mm;所述离型层的厚度为0.03~0.04mm,宽度为1060mm~2120mm。能直接用于单层屋面方面和金属屋面外露抗紫外耐晒,克服热塑性聚烯烃弹性体(TPO)片材外露抗晒寿命只有5~10年左右,使用寿命延长到25年,满足新的“市政和建筑防水通用规范”要求,维护成本大大降低。
Description
技术领域
本发明涉及建筑防水材料领域,特别涉及一种防水卷材用PVDF复合TPO耐晒抗老化复合膜及制备方法。
背景技术
在防水行业,热塑性聚烯烃类(TPO)防水卷材是一种以聚乙烯树脂为基料,采用先进聚合技术和特定配方制成的片状热塑性橡胶类弹性防水材料,配料中不含增塑剂,不存在增塑剂迁移而变脆,具有拉伸强度大、耐穿性好,易加工,可焊接、施工方便,完全回收,绿色环保。
TPO材料热塑性弹性体,聚合物一部分分子链段发生结晶,另一部分链段保持柔顺性,使得材料同时具有刚性和弹性的链段,具有热塑性弹性体的物理交联结构。分子主链为C~C键,侧基C~H键,C~H键能保护C~C主链能力有限。
TPO的基材为PE,而紫外光是引起PE老化的主要因素,其所具有的能量在攻击高分子化学结构导致断键、断链等“光致化学降解”作用上最有威力。据光量子理论,在290~400nm范围的紫外光所具有的能量高于TPO链上各种化学键断裂所需要的能量,且远紫外光(波长200~00nm)的存在还会使材料的光氧老化变得更为明显。所以,TPO虽然有一定的抗紫外能力,抗紫外老化能力有限,即使增加抗紫外助剂,外露耐候一般在5~10年左右,根据新的“市政和建筑防水通用规范”要求:屋面防水年限超过25年,显然作为外露抗晒材料,TPO是不能达到外露超过25年要求的。
发明内容
为了克服上述现有技术的不足,本发明提供了一种防水卷材用PVDF复合TPO耐晒抗老化复合膜及制备方法。
为达到上述目的,本发明解决其技术问题所采用的技术方案是:一种防水卷材用PVDF复合TPO耐晒抗老化复合膜,由依次设置的PVDF膜、胶水层、TPO层、粘合胶层和离型层构成,其中:
所述PVDF膜的厚度为0.015~0.025mm,宽度为860mm~1920mm;
所述胶水层的厚度为0.0003~0.0005mm,宽度为860mm~1920mm;
所述TPO层的厚度为2~5mm,宽度为900mm~1100mm;
所述粘合胶层的厚度为1~2mm,宽度为1060mm~2120mm;
所述离型层的厚度为0.03~0.04mm,宽度为1060mm~2120mm。
作为优选,所述PVDF膜由重量比PVDF:LDPE:EGMA-g-PMMA:色母为100:20~40:5~6:3~5的组分制成。
作为优选,所述胶水层为分子链中含有氨酯基和异氰酸酯基的聚氨酯胶水。
作为优选,所述粘合胶层为改性丁基橡胶。
作为优选,所述离型层是PET离型膜或PE离型膜。
一种防水卷材用PVDF复合TPO耐晒抗老化复合膜的制备方法,所述PVDF膜原料由将原料PVDF、LDPE、EGMA-g-PMMA和色母放入直径长径比为40:1的平行双螺杆造粒机制备。
作为优选,所述EGMA-g-PMMA的制备步骤如下:
以PMMA为单体、4,4’-偶氮(4-氰基戊酸)为引发剂,巯基乙酸为链转移剂,通过自由基调聚反应合成出了PMMA-COOH低聚物,将所述PMMA-COOH低聚物作为组装单元,使其与线形聚合物EGMA(乙烯-甲基丙烯酸缩水甘油酯共聚物)主链上的环氧基团在PVDF与LDPE界面上发生开环反应,原位生成EGMA-g-PMMA接枝聚合物。
由于上述技术方案的运用,本发明与现有技术相比具有下列有益效果:
1.将高强度、柔顺的热塑性聚烯烃弹性体(TPO)片材和抗紫外老化的聚偏氟乙烯(PVDF)的膜通过复合机复合,能直接用于单层屋面方面和金属屋面外露抗紫外耐晒,克服热塑性聚烯烃弹性体(TPO)片材外露抗晒寿命只有5~10年左右,使用寿命延长到25年,满足新的“市政和建筑防水通用规范”要求,维护成本大大降低;
2.聚偏氟乙烯(PVDF)复合热塑性聚烯烃弹性体(TPO)片材制成的抗紫外耐晒膜做成的片材,因其聚偏氟乙烯(PVDF)有其反射其太阳光作用,有效的降低室内温度,起到节能环保作用,是绿色环保产品;
3.聚偏氟乙烯(PVDF)复合热塑性聚烯烃弹性体(TPO)片材制成的抗紫外耐晒膜做成的片材表面自洁性好,不粘灰层,外观美观。符合城市干净美观要求;
4.本发明的创新点在于制造聚偏氟乙烯(PVDF)的膜采用多层吹膜的方式,因吹涨和拉伸,具有双向拉伸的作用,各向同性增强,产品力学性能增加,克服流延挤出法无拉伸,产品的力学性能差的特点;
5.本发明的创新点在于制造聚偏氟乙烯(PVDF)的膜的原料采用共混改性的方法,按材料寿命年限要求,可调节PVDF中氟含量;
6.本发明的创新点在于粘合偏氟乙烯(PVDF)膜和热塑性聚烯烃弹性体(TPO)片材的胶水采用耐老化韧性聚氨酯胶水,其胶水不含双键,耐老化性能好,改性后胶水韧性增加;
7.本发明采用特殊的搭接方式,有效解决了的PVDF因不能热熔而不能搭接边难题;
8.通过复合,将热塑性聚烯烃弹性体(TPO)片材的高强度和聚偏氟乙烯(PVDF)的抗晒耐老化有效的结合,两种材料性能相互补充,扩展了两种材料的使用场景;
9.聚偏氟乙烯(PVDF)复合热塑性聚烯烃弹性体(TPO)片材具有高强度,纵、横向拉伸强度≧70Mpa。
附图说明
图1是本实施例的结构示意图;
图中:1、PVDF膜;2、胶水层;3、TPO层;4、粘合胶层;5、离型层。
具体实施方式
下面结合具体实施例,对本发明的内容做进一步的详细说明:
本发明一实施例提供一种聚偏氟乙烯(PVDF)膜复合热塑性聚烯烃弹性体(TPO)片材制成的抗紫外耐晒防水片材为五层结构:
第一层为PVDF膜1,厚度为0.015~0.025mm,宽度860mm~1920mm,宽度比TPO短200mm。宽度短是PVDF材料本身无法热熔焊接,两边予留100mm搭接边宽度,用TPO材料相互热熔所以PVDF的宽度要小于TPO宽度200mm,用宽度100mm的外层为PVDF,内层TPO复合膜做搭接边。PVDF厚度在0.015~0.020mm,TPO厚度在2~5mm;
第二层为胶水层2,厚度为0.005~0.010mm,宽度860mm~1920mm,同样因为保留搭接边,宽度比TPO短200mm;
第三层为热塑性聚烯烃弹性体(TPO)片材,厚度为2~5mm,宽度1060mm~2120mm;
第四层为粘合胶层4,粘合胶层4可以是改性丁基橡胶等具有粘合性能的胶状材料,厚度为1~2mm,宽度1060mm~2120mm;
第五层为离型层5,离型层5的材料可以是PET离型膜或PE离型膜,主要起隔离作用,厚度为0.035~0.04mm,宽度1060mm~2120mm。
本发明第一层PVDF膜1,用平行双螺杆造粒机改性造粒,以甲基丙烯酸甲酯(PMMA)为单体、4,4’-偶氮(4-氰基戊酸)(ACVA)为引发剂,巯基乙酸(TGA)为链转移剂,通过自由基调聚反应合成出了PMMA-COOH低聚物,并通过调节单体、引发剂与链转移剂三者的投料比,制备得到了分子量可控,分子量分布较窄的分子量2000~8000的PMMA-COOH低聚物;
再将PMMA-COOH低聚物作为组装单元,使其与线形聚合物EGMA(乙烯-甲基丙烯酸缩水甘油酯共聚物)主链上的环氧基团在PVDF与LDPE界面上发生开环反应,原位生成EGMA-g-PMMA接枝聚合物。EGMA-g-PMMA作为PVDF和LDPE相容剂,能有效改善PVDF与LDPE之间的相容性,减小共混组分之间的界面张力,增强界面之间的粘结性,极大地提高PVDF/LDPE共混物的力学性能。
按重量比聚偏氟乙烯(PVDF):低密度聚乙烯(LDPE):增容剂EGMA-g-PMMA:色母=100:20~40:5~6:3~5,用直径长径比(L/D)=40:1的平行双螺杆造粒机,改性造粒,制成能吹膜的PVDF改性料。
PVDF(聚偏氟乙烯),分子式-(CH2-CF2)n-,因C-F键能489KJ/mol,结构决定性能,PVDF氟元素由于具有电负性最大、原子半径很小且形成的C-F键长短、键能大、F原子和含氟基团对主链起保护作用等结构特点,紫外光能量很难打断主链,而形成了抗紫外辐照、耐气候,耐辐照,抗化学腐蚀、耐沾污、防水等性能特点。作为热塑性聚烯烃类(TPO)防水卷材的保护材料,PVDF(聚偏氟乙烯)外层保护能使热塑性聚烯烃类(TPO)防水卷材外露抗晒使用,能延长屋面防水年限超过25年。
用三层上吹膜机吹制成单色或双色PVDF膜1,双色PVDF膜1,如白膜,黑膜,黑白膜,蓝黑膜,绿白膜等,用调整LDPE含量,来调整PVDF含氟量,从而作到不同年限的抗晒膜。
本发明第二层为胶水层2,采用聚氨酯胶水,因分子链中含有氨酯基和异氰酸酯基的胶水,由于含有强极性的异氰酸酯和氨基甲酸酯基,具有很高的反应性,能够室温固化。聚氨酯的主链柔性很好,其最大特点是耐受冲击震动和弯曲疲劳,剥离强度很高,特别是耐低温性能极其优异,其胶水不含双键,耐老化性能好,改性后胶水韧性增加。
本发明第三层为TPO层3,热塑性聚烯烃弹性体(TPO)片材总厚度2mm~5mm,以聚合型TPO树脂为基础原料,通过添加阻燃剂、润滑剂和其它助剂等制备TPO防水卷材专用料。
本发明的第四层为粘合胶层4,粘合胶层4可以是改性丁基橡胶等具有粘合性能的胶状材料。
第五层为离型层5,离型层5材料可以是PET离型膜或PE离型膜,主要起隔离作用。
现有技术相比,本实施例具有以下有益效果:
1.将高强度、柔顺的热塑性聚烯烃弹性体(TPO)片材和抗紫外老化的聚偏氟乙烯(PVDF)的膜通过复合机复合,能直接用于单层屋面方面和金属屋面外露抗紫外耐晒,克服热塑性聚烯烃弹性体(TPO)片材外露抗晒寿命只有5~10年左右,使用寿命延长到25年,满足新的“市政和建筑防水通用规范”要求,维护成本大大降低;
2.聚偏氟乙烯(PVDF)复合热塑性聚烯烃弹性体(TPO)片材制成的抗紫外耐晒膜做成的片材,因其聚偏氟乙烯(PVDF)有其反射其太阳光作用,有效的降低室内温度,起到节能环保作用,是绿色环保产品;
3.聚偏氟乙烯(PVDF)复合热塑性聚烯烃弹性体(TPO)片材制成的抗紫外耐晒膜做成的片材表面自洁性好,不粘灰层,外观美观。符合城市干净美观要求;
4.本发明的创新点在于制造聚偏氟乙烯(PVDF)的膜采用多层吹膜的方式,因吹涨和拉伸,具有双向拉伸的作用,各向同性增强,产品力学性能增加,克服流延挤出法无拉伸,产品的力学性能差的特点;
5.本发明的创新点在于制造聚偏氟乙烯(PVDF)的膜的原料采用共混改性的方法,按材料寿命年限要求,可调节PVDF中氟含量;
6.本发明的创新点在于粘合偏氟乙烯(PVDF)膜和热塑性聚烯烃弹性体(TPO)片材的胶水采用耐老化韧性聚氨酯胶水,其胶水不含双键,耐老化性能好,改性后胶水韧性增加;
7.本发明采用特殊的搭接方式,有效解决了的PVDF因不能热熔而不能搭接边难题;
8.通过复合,将热塑性聚烯烃弹性体(TPO)片材的高强度和聚偏氟乙烯(PVDF)的抗晒耐老化有效的结合,两种材料性能相互补充,扩展了两种材料的使用场景;
9.聚偏氟乙烯(PVDF)复合热塑性聚烯烃弹性体(TPO)片材具有高强度,纵、横向拉伸强度≧70Mpa。
上述实施例只为说明本发明的技术构思及特点,其目的在于让熟悉此项技术的人士能够了解本发明的内容并加以实施,并不能以此限制本发明的保护范围,凡根据本发明精神实质所作的等效变化或修饰,都应涵盖在本发明的保护范围内。
Claims (7)
1.一种防水卷材用PVDF复合TPO耐晒抗老化复合膜,其特征在于,由依次设置的PVDF膜、胶水层、TPO层、粘合胶层和离型层构成,其中:
所述PVDF膜的厚度为0.015~0.025mm,宽度为860mm~1920mm;
所述胶水层的厚度为0.0003~0.0005mm,宽度为860mm~1920mm;
所述TPO层的厚度为2~5mm,宽度为900mm~1100mm;
所述粘合胶层的厚度为1~2mm,宽度为1060mm~2120mm;
所述离型层的厚度为0.03~0.04mm,宽度为1060mm~2120mm。
2.根据权利要求1所述的一种防水卷材用PVDF复合TPO耐晒抗老化复合膜,其特征在于:所述PVDF膜由重量比PVDF:LDPE:EGMA-g-PMMA:色母为100:20~40:5~6:3~5的组分制成。
3.根据权利要求1所述的一种防水卷材用PVDF复合TPO耐晒抗老化复合膜,其特征在于:所述胶水层为分子链中含有氨酯基和异氰酸酯基的聚氨酯胶水。
4.根据权利要求1所述的一种防水卷材用PVDF复合TPO耐晒抗老化复合膜,其特征在于:所述粘合胶层为改性丁基橡胶。
5.根据权利要求1所述的一种防水卷材用PVDF复合TPO耐晒抗老化复合膜,其特征在于:所述离型层是PET离型膜或PE离型膜。
6.一种权利要求1~5任一项所述的防水卷材用PVDF复合TPO耐晒抗老化复合膜的制备方法,其特征在于:所述PVDF膜原料由将原料PVDF、LDPE、EGMA-g-PMMA和色母放入直径长径比为40:1的平行双螺杆造粒机制备。
7.根据权利要求6所述的一种防水卷材用PVDF复合TPO耐晒抗老化复合膜的制备方法,其特征在于:所述EGMA-g-PMMA的制备步骤如下:
以PMMA为单体、4,4’-偶氮(4-氰基戊酸)为引发剂,巯基乙酸为链转移剂,通过自由基调聚反应合成出了PMMA-COOH低聚物,将所述PMMA-COOH低聚物作为组装单元,使其与线形聚合物EGMA(乙烯-甲基丙烯酸缩水甘油酯共聚物)主链上的环氧基团在PVDF与LDPE界面上发生开环反应,原位生成EGMA-g-PMMA接枝聚合物。
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