铝塑复合管用热熔胶粘剂的研究简报

针对铝塑复合管用热熔胶粘剂的特点，确定了以α-烯酸接枝聚乙烯的接枝物作为铝塑复合管粘接用胶。详细研究了接枝剂和引发剂用量、反应温度等因素对接枝聚合物主要性能的影响。     

给水用钢丝增强聚乙烯复合管道粘接树脂的研究

利用反应性接枝和物理共混两种技术,制备了一种适合于粘接聚烯烃树脂和金属铜的粘接树脂。主要研究了反应性接枝配方和物理共混配方对树脂粘接性能的影响。采用接触角、扫描电子显微镜、能谱等表征和测试手段,对最终的接枝树脂和粘接树脂的极性、粘接性能进行了研究。结果表明,聚乙烯接枝马来酸酐(PE-g-MAH)的最佳配方为:线型低密度聚乙烯90份,高密度聚乙烯10份,马来酸酐1.5份,过氧化二异丙苯0.08份,抗氧剂1010和抗氧剂168分别为0.2份。最高接枝温度为180℃。粘接树脂的最佳配方为:PE-g-MAH 100份,增粘树脂6份,调节剂15份。研制的粘接树脂具有和聚烯烃一样的加工性能和条件,同时表现出极佳的粘接性能,主要用于给水用钢丝增强聚乙烯复合管道。     

铝塑复合板用热熔胶的制备及性能研究

以过氧化二异丙苯(DCP)为引发剂、马来酸酐(MAH)为接枝改性单体和聚乙烯(PE)为主要原料,采用熔融挤出法制备了铝塑复合板用PE-g-MAH(聚乙烯接枝马来酸酐)基HMA(热熔胶),并着重探讨了DCP和MAH含量对PE-g-MAH的接枝效率和粘接性能等影响。结果表明:在试验范围内,PE-g-MAH的接枝效率(y)与DCP含量(x1)或MAH含量(x2)之间的关系符合y=28.03x1+1.49或y=0.73x2+10.65的线性关系;当w(DCP)=0.44%、w(MAH)=2%时,PE-g-MAH基HMA的粘接性能相对最好,其剪切强度(6.10 MPa)高于杜邦HMA(4.26 MPa),并且其接枝效率为12.91%。     

热熔胶用马来酸酐接枝聚乙烯研究进展

通过双螺杆挤出机将马来酸酐熔融接枝聚乙烯,制备的聚乙烯热熔胶具有粘接性能强、价格低等优点,广泛地应用于钢塑复合管。本文根据近年来聚乙烯热熔胶的研究方向,综述了新型引发剂及引发方式对接枝反应的影响;比较了不同种类聚乙烯接枝效果的差异;总结了改性单体对热熔胶性能的改善以及温度、挤出机螺杆结构和转速等工艺条件对聚乙烯热熔胶的影响。分别总结了化学滴定法和红外光谱法对接枝率的表征;简述了材料表面处理和涂胶工艺对剥离强度的影响。分析了热熔胶剥离强度传统制样方法的不足,并总结了能得到稳定真实剥离强度的制样方案。展望了低马来酸酐含量、高粘接强度的绿色环保型聚乙烯热熔胶的研究前景。     

聚烯烃粘接树脂配方研究

不同的聚烯烃树脂接枝不同的极性单体的表面张力不同,直接影响了粘接树脂与金属的润湿能力进而影响了粘接性能。马来酸酐(MAH)、降冰片烯二酸酐(XMNA)与聚烯烃接枝可以与金属实现良好粘接,而环氧丙烯酸酯(AA)、环氧基硅烷偶联剂(Silane)、甲基丙烯酸缩水甘油酯(GMA)则对聚烯烃接枝改性后粘接性能没有改善。不同基体树脂接枝马来酸酐(MAH)对粘接强度的影响也不同,高密度聚乙烯(HDPE)0658、HDPE 60550A和HDPE 8008接枝马来酸酐得到的粘接树脂强度较好,HDPE 5000S次之。     

铝塑复合带用树脂的研制

研究了以高度聚乙烯（ＨＤＰＥ）接枝马来酸酐（ＭＡＨ）为原料，制备铝塑复合带用树脂的技术。探讨了引发剂及接枝单体用量对熔体流动速率、接枝率、剥离强度的影响。结果表明：ＨＤＰＥ经过接枝马来酸酐并混配其它树脂可制得与ＥＡＡ（乙烯－丙烯酸共聚物）相媲美的铝塑复合带用树脂。     

CPP/MAH接枝共聚物合成及粘接性能研究

用马来酸酐 (MAH)对氯化聚丙烯 (CPP)进行接枝共聚 ,通过 1R分析证明马来酸酐与氯化聚丙烯发生了接枝共聚反应 ,考察了不同条件下制得的CPP/MAH接枝共聚物胶粘剂对聚烯烃材料的粘接性能 ,结果表明CPP/MAH共聚物胶粘剂对聚烯烃材料具有较好的粘接性能。     

PP-R塑铝稳态复合管用热熔胶对铝粘接性能的研究

研究了无规共聚聚丙烯(PP-R)塑铝稳态复合管用热熔胶的主要成分对热熔胶和铝的粘接性能的影响.结果发现,当基材采用丙烯-乙烯-丁烯三元共聚物,且丙烯-乙烯-丁烯三元共聚物、马来酸酐接枝聚丙烯、乙烯类弹性体、石油树脂质量配比为60:25:10:5时,制备的PP-R塑铝稳态复合管用热熔胶对铝的粘接性能最好,剥离强度达到5....     

PE钢塑复合管热溶胶的制备

PE/不锈钢复合管专用热溶胶是生产高质量钢塑复合管的重要影响因素之一.通过采用接枝共混反应工艺,以马来酸酐为功能基团并辅以合适的增牯树脂制得的热溶胶,它对不锈钢和塑料具有良好的粘接性.     

PE-g-MAH粘接剂的制备及其在阻隔膜中的粘接性能研究

采用双螺杆熔融挤出法制备了马来酸酐接枝聚乙烯(PE-g-MAH)。探讨了在以基体树脂为线型低密度聚乙烯(LLDPE)的基础上,添加不同种类引发剂含量、不同接枝单体马来酸酐(MAH)含量对制备出PE-g-MAH的性能的影响。同时也探究了不同接枝率、熔融指数以及晶点个数的PE-g-MAH粘接剂在乙烯-乙烯醇共聚物(EVOH)阻隔膜上粘接性能的影响。通过傅里叶变换红外光谱对接枝产物进行定性表征并分析接枝物接枝率,通过熔体流动速率测试分析其流动性,通过180°剥离强度测试分析粘接剂的性能。研究结果表明：当引发剂为过氧化二异丙苯(DCP)且添加0.05份,MAH添加1份时,PE-g-MAH接枝率为0.68%,熔融指数为0.94 g·(10 min)^-1,晶点个数为12,此时材料粘接性能最佳;选择EVOH作为阻隔层粘接,当接枝率为0.68%时,PE-g-MAH的剥离强度达到最大值为69.0 N/cm,PE-g-MAH粘接剂的粘接性能达到相对最佳。     

MAH-g-LLDPE增容改性rPET/mLLDPE合金材料的研究

以马来酸酐接枝线性低密度聚乙烯(MAH-g-LLDPE)为相容剂,回收聚对苯二甲酸乙二醇酯(rPET)为基体材料,茂金属线性低密度聚乙烯(mLLDPE)为增韧材料,制备rPET/mLLDPE塑料合金材料。采用DSC、SEM分析MAH-g-LLDPE对rPET/mLLDPE结晶性能及断面相结构的影响,测试了rPET/mLLDPE材料的流变性能及力学性能。结果表明,mLLDPE的加入使得rPET/mLLDPE熔体结晶峰向右移动,结晶温度提高;MAH-g-LLDPE的加入,共混体系中rPET的玻璃化转变温度(tg)朝低温方向移动,rPET与mLLDPE相容性增强,相界面模糊,界面黏结力强,熔融塑化过程扭矩值增大。含5%MAH-g-LLDPE的rPET/mLLDPE材料,与纯rPET相比,其结晶温度(tc)提高24.73℃,断裂伸长率提高113.6%,缺口冲击强度提高66.48%,柔韧性和抗冲击性能较大幅度提高。     

Synergistic compatibilization and reinforcement of HDPE/wood flour composites

Multi‐monomer grafted copolymers, high‐density polyethylene‐grafted‐maleic anhydride‐styrene (HDPE‐g‐(MAH‐St)) and polyethylene wax‐grafted‐ maleic anhydride ((PE wax)‐g‐MAH), were synthesized and applied to prepare high‐performance high‐density polyethylene (HDPE)/wood flour (WF) composites. Interfacial synergistic compatibilization was studied via the coordinated blending of high‐density polyethylene‐grafted‐maleic anhydride (MPE‐St) and polyethylene wax‐grafted‐ maleic anhydride (MPW) in the high‐density polyethylene (HDPE)/wood flour (WF) composites. Scanning electron microscopy (SEM) morphology and three‐dimensional WF sketch presented that strong interactive interface between HDPE and WF, formed by MPE‐St with high graft degree of maleic anhydride (MAH) together with the permeating effect of MPW with a low molecular weight. Experimental results demonstrated that HDPE/WF composites compatibilized by MPE‐St/MPW compounds showed significant improvement in mechanical properties, rheological properties, and water resistance than those compatibilized by MPE, MPE‐St or MPW separately and the uncompatibilized composites. The mass ratio of MPE‐St/MPW for optimizing the HDPE/WF composites was 5:1. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 42958.     

回收PET瓶片/接枝PE反应共混物的形态及性能

利用有反应活性的各种接枝聚乙烯(PE)作为回收聚对苯二甲酸乙二酯(PET)瓶片的改性剂,使接枝PE上的活性酐基与PET的端羟基在不同的挤出设备中熔融反应,制备相分散均匀、力学性能较好的PET基工程塑料.结果表明,挤出设备的选择对混合效果影响较大,缩聚型反应挤出机和双螺杆挤出机比普通单螺杆挤出机具有更优良的混合效果;各种接枝PE的改性效果优劣次序是:马来酸酐接枝线型低密度聚乙烯,马来酸酐接枝低密度聚乙烯,马来酸酐接枝高密度聚乙烯;接枝PE添加质量分数为20%时,可大幅度提高反应共混物的冲击性能.     

HDPE-g-MAH和POE-g-MAH对HDPE/PA6共混物性能的影响

分别以高密度聚乙烯接枝马来酸酐（HDPE-g-MAH）和乙烯-辛烯共聚物接枝马来酸酐（POE-g-MAH）作为相容剂,通过熔融挤出法对PE100/PA6共混物进行共混改性。研究了两种相容剂的用量对共混物力学性能、热性能和微观结构的影响。结果表明：HDPE-g-MAH与POE-g-MAH相比,都使体系发生反应性增容的同时,对共混物的结晶性更为有利,使得PE100/PA6/HDPE-g-MAH的综合性能更好,更适合作为PE100耐热改性时的增容剂。     

高密度聚乙烯／蒙脱土纳米复合材料的制备与性能研究

采用马来酸酐接枝乙烯醋酸乙烯酯（EVA-g-MAH）和马来酸酐接枝低密度聚乙烯（PE-LD-g-MAH）为相容剂，制备了高密度聚乙烯傣脱土（PE-HD／MMT）纳米复合材料。用X射线衍射和扫描电镜对有机蒙脱土和PE-HD／MMT复合材料的结构进行了表征，研究了蒙脱土和相容剂含量对制备的纳米复合材料力学性能及热性能的影响。结果表明，相容剂的加入有利于插层。MMT在复合材料中呈纳米级分散。其层间距可由2．10nm增大至3．85nm。MMT含量为3％（质量分数，下同）、EVA-g-MAH含量为15％时，复合材料的综合力学性能最好，冲击强度和拉伸强度分别较PE-HD提高43．7％和5.8％。     

Enhancement of wood/polyethylene composites via compatibilization and incorporation of organoclay particles

Despite many advantages of wood–polyethylene composites, the shortcomings of this kind of composite include relatively low modulus, low notched impact resistance, relatively large thermal expansion, as well as substantial creep. In this article, in addition to using maleic anhydride grafted polyethylene as compatibilizer, organoclay was introduced into the polyethylene matrix so as to further enhance the thermal and mechanical performance. First, the influence of maleic anhydride grafted polyethylene type and loading on the morphology and properties of wood/HDPE composites was studied. Then, the effects of organoclay loading and of the compounding procedure on the wood/HDPE composites were investigated. The compatibilization was found to result in better polymer impregnation on the wood, reduced linear thermal expansion coefficients, and significantly improved mechanical properties. Incorporation of organoclay further reduced the thermal expansion and elevated the heat deflection temperature. More compatibilizer is needed to maintain the mechanical properties with the presence of clay. POLYM. ENG. SCI., 47:797–803, 2007. © 2007 Society of Plastics Engineers     

PS/PE-g-MAH及PS/PE相容性评价的分子动力学模拟

采用分子动力学(MD)模拟方法对比研究了聚乙烯(PE)与聚苯乙烯(PS)共混体系和力化学反应法马来酸酐接枝聚乙烯(PE-g-MAH)与PS共混体系的相容性。通过对MD模拟得到的溶解度参数、玻璃化转变温度、径向分布函数和均方末端距的分析,对两种共混物的相容情况进行评价。研究表明,PS/PE体系的共混相容情况不好,而PS/PE-g-MAH体系相对于PS/PE体系,相容性得到明显改善。模拟结论与实验结果相一致。     

Compatibilization of a polyolefin blend through covalent and ionic coupling of grafted polypropylene and polyethylene. I. Rheological,thermal, and mechanical properties

A polypropylene/high‐density polyethylene blend containing 70 wt % polypropylene was prepared and compatibilized via the addition of maleic anhydride grafted polypropylene and polyethylene. The functionalized polymer chains were coupled with two types of coupling agents. Dodecane diamine formed covalent bonds with the maleic anhydride, whereas two metallic salts, zinc acetate and sodium hydrogenocarbonate, formed ionic interactions with the carboxylic functions produced by the hydration of the anhydride cycle. The coupling of the grafted polyolefin chains was successfully realized by a single operation in a twin‐screw extruder. The coupling agents were efficient in improving the elongation at break and impact properties of the studied blends. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 95: 312–320, 2005     

控制聚乙烯熔融接枝马来酸酐副反应的研究进展

介绍了聚乙烯熔融接枝马来酸酐的反应机理,引发剂用量、单体用量、螺杆转速、反应温度等对反应的影响。综述了熔融接枝过程中控制副反应发生的方法,包括加入给电子体、共聚单体、新型引发剂或复配引发剂以及加入其他有机物添加剂,同时比较了加入这些物质的有效性。展望了聚乙烯熔融接枝马来酸酐的发展趋势。     

Synthesis and characterization of high‐density polypropylene‐grafted polyethylene via a macromolecular reaction and its rheological behavior

High‐density polyethylene grafted isotactic polypropylene (PP‐g‐HDPE) was prepared by the imidization reaction between maleic anhydride grafted polyethylene and amine‐grafted polypropylene in a xylene solution. The branch density was adjusted by changes in the molar ratio between maleic anhydride and primary amine groups. Dynamic rheology tests were conducted to compare the rheological properties of linear polyolefins and long‐chain‐branched polyolefins. The effects of the density of long‐chain branches on the rheological properties were also investigated. It was found that long‐chain‐branched hybrid polyolefins had a higher storage modulus at a low frequency, a higher zero shear viscosity, a reduced phase angle, enhanced shear sensitivities, and a longer relaxation time. As the branch density was increased, the characteristics of the long‐chain‐branched structure became profounder. The flow activation energy of PP‐g‐HDPE was lower than that of neat maleic anhydride grafted polypropylene (PP‐g‐MAH) because of the lower flow activation energy of maleic anhydride grafted high‐density polyethylene (HDPE‐g‐MAH). However, the flow activation energy of PP‐g‐HDPE was higher than that of PP‐g‐MAH/HDPE‐g‐MAH blends because of the presence of long‐chain branches. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009