薄膜级EVA树脂的结构与性能

研究了两种薄膜级乙烯-乙酸乙烯共聚物(EVA)GN1和GN2的结构与性能,并在农膜生产厂进行了薄膜加工试验。结果表明:GN1和GN2均具有较高的相对分子质量,重均分子量分别比进口树脂高18%,15%;相对分子质量分布相对较宽,力学性能好,加工性能、耐老化性能优良;与功能母粒及其他树脂的相容性较好,综合性能与同类进口树脂相当。用GN2加工薄膜的过程中,温度对薄膜性能影响较小;随吹胀比增大,薄膜的横向拉伸断裂应力提高,纵向拉伸断裂应力降低。     

两种共聚聚丙烯PPH–M12N流变性能的对比

应用旋转流变仪、转矩流变仪、螺纹圈、熔体流动速率(MFR)仪等测试手段,研究了两种管材用新型聚丙烯(PP)(丙烯与1–辛烯分段共聚物,PPH–M12N–1与PPH–M12N–2)与一种对比牌号PP的MFR、转矩流变性能、损耗模量与储能模量、复数黏度等性能。研究结果表明,三种PP的分子链结构及流变性能均有所差异,PPH–M12N–1(丙烯∶1–辛烯=4∶1)比PPH–M12N–2(丙烯∶1–辛烯=3∶2)具有更高的熔体质量流动速率和加工流动性(PPH–M12N–1的MFR为3.34 g/10 min,PPH–M12N–2的MFR为1.24 g/10 min),尤其是PPH–M12N–1的零剪切黏度(PPH–M12N–1零剪切黏度为2 087 Pa·s,PPH–M12N–2的零剪切黏度为3 478 Pa·s)更低,适合复杂条件下的成型加工,PPH–M12N–2的成型加工性能与对比牌号聚丙烯相近。     

管材专用无规共聚聚丙烯YPR4502的生产与应用

在200 kt/a气相聚丙烯工艺装置上,采用专用主催化剂和优化的生产工艺条件,开发出管材专用无规共聚聚丙烯(PPR)YPR4502。采用差示扫描量热仪、核磁共振波谱仪、凝胶渗透色谱仪等研究了YPR4502的结构与性能,并与国内外同类产品进行了对比。结果表明:YPR4502的熔点和流变性能与国内专用树脂相当;拉伸屈服应力和冲击强度接近国外专用树脂PPR-2,高于国内专用树脂;相对分子质量分布介于两者之间。经下游用户试用,YPR4502的各项性能指标均满足行业标准和用户要求。     

BOPP烟膜专用树脂的工业化生产

工业化生产了双向拉伸聚丙烯烟膜专用树脂F280T,采用凝胶渗透色谱仪和差示扫描量热仪等研究了产品的相对分子质量及其分布、熔点及物理和光学性能,并与国内外同类树脂进行了对比。结果表明:F280T的物性指标接近或优于对比试样;相对分子质量分布介于2个对比样之间,与进口试样更接近;熔点与进口试样相当,均为无规共聚产品;光学性能与进口试样相近。     

发泡聚丙烯板材专用料的研制报告

主要介绍了发泡聚丙烯板材专用料的研制及性能．     

紫外光吸收剂对不同结构聚丙烯光降解影响

主要研究紫外光吸收剂对均聚聚丙烯(PPH)、嵌段共聚聚丙烯(PPB)和无规共聚聚丙烯(PPR)3种不同结构聚丙烯(PP)紫外光降解性能的影响,通过色差仪、体视显微照片、傅立叶红外光谱等对不同结构PP/紫外光吸收剂体系结构与性能进行表征。结果表明,紫外光吸收剂UV531对于PP的耐紫外光性能较UV326好;不同结构的PP与紫外光吸收剂的复配体系中,PPB与紫外光吸收剂复配体系的耐紫外光性能较好。     

青岛炼化携手美利肯开发薄壁注塑专用聚丙烯树脂

<正>近年来,消费者对价格实惠、成分安全、透明度高的包装产品的需求显著上升,中国石化青岛炼油化工有限责任公司(简称"青岛炼化")推出的使用美利肯化工Hyperform?HPN20E成核剂的薄壁注塑专用聚丙烯树脂PPH–MM45,PPH–MM50,PPH–MM60系列产品,正是顺应了这种趋势。聚丙烯树脂是一种极为适宜制造一次性食品包装的塑料,完全可回收,能够减少碳足迹,质量也远较许多其它塑     

聚丙烯厚板材专用树脂B200通过技术评定

2005年11月22日,中国石油化工股份有限公司北京燕山分公司(简称燕山石化)召开了“聚丙烯(PP)厚板材专用树脂B 200开发和生产”评定会。与会专家们认为,PP厚板材专用树脂B 200     

聚丙烯耐醋酸、硫酸腐蚀的试验

聚丙烯是在六十年代发展起来的新颖热塑性塑料。它的比重小,耐热性能好,使用温度可达100℃。据资料介绍,对许多化工介质具有良好的耐腐蚀性能。国外近几年来聚丙烯发展较快,已有一些在化工生产中应用较好的实例报道,应用范围越来越广。兰州化工厂、上海高桥化工厂均已生产聚丙烯树脂。随着我国化学工业的迅速发展,许多生产聚丙烯树脂的工厂在筹建。1971年我所在天津塑料膜板厂,已初步试制出3毫米、10毫米、1毫米和2毫米厚的聚丙烯板材。为了使聚丙烯在化工生产中合理的应用,     

注塑成型工艺对管材专用PPH刚韧性能的影响

考察了熔体温度、注射压力和保压时间等注塑成型工艺参数对管材专用均聚聚丙烯(PPH)刚韧性能的影响。结果表明:熔体温度是影响PPH刚韧性能的主要因素,随着熔体温度的升高,材料的弯曲模量和负荷变形温度呈下降趋势,简支梁缺口冲击强度先增加后降低。熔体温度为210℃时,PPH的弯曲模量,负荷变形温度分别为1 780 MPa,109.3℃;当熔体温度升至290℃时,材料的弯曲模量,负荷变形温度分别降至1 388 MPa,100.8℃。熔体温度为250℃时,PPH的简支梁缺口冲击强度最大,为114.95 kJ/m2。注射压力过高会降低PPH的冲击强度,当压力从4 MPa提高到5 MPa时,材料的冲击强度从114.95 kJ/m2迅速降至107.81 kJ/m2。保压时间低于30 s时, PPH的刚韧性能均下降。     

高熔体流动速率薄壁注塑聚丙烯专用料的结构与性能分析

采用多种分析测试方法，对3类高熔体流动速率薄壁注塑聚丙烯（PP）专用料的熔融结晶性能、光学性能、分子量分布、力学性能、毛细管流变性能、热收缩性能进行了分析研究。结果表明，K1860与2种市售主流PP1、PP2各项性能相当，其中K1860分子量分布相对PP1、PP2较窄，弯曲性能、拉伸性能更优，可满足大型薄壁注塑制品的生产要求。     

UHMWPE改性PP共混物的力学性能

研究了UHMWPE型号及UHMWPE的用量对PP材料力学性能的影响。结果表明:在PPH/PPR/PPB为60/20/20时分别加入UHMWPE2401和UHMWPE2402,可起到增强增韧的效果,在开炼机上制试样UHMWPE2402的效果要好于UHMWPE2401,注射制样为UHMWPE2401好于UHMWPE2402;随UHMWPE含量的增加,PPH/PPR/PPB共混物的缺口冲击强度大体呈直线上升趋势,在UHMWPE2401为20份时,达到29 4kJ/m2。     

不同受阻胺光稳定剂改性聚丙烯耐光老化性能研究

分析了4种受阻胺光稳定剂在聚丙烯(PP)加工过程中的热稳定性,并研究其单一和复合使用对PP其光稳定性能和力学性能的影响。以失重率为10%时的热分解温度衡量受阻胺光稳定剂的热稳定性,结果表明,受阻胺光稳定剂的加入,使PP的光稳定性能增强;高低分子量受阻胺复合使用,可降低PP的黄变因数和羰基指数,增加其拉伸强度及冲击强度保持率;GW622、GW944和Tinuvin144复合使用效果最佳。     

Natural rubber–isotactic polypropylene thermoplastic blends

Thermoplastic elastomers, prepared by melt blending of natural rubber (NR) and isotactic polypropylene (PP) through a dynamic vulcanization technique, were developed during the later 1970s. However, they have certain drawbacks due to thermal degradation and higher molecular weight of NR. In the study reported here, NR was masticated to different levels prior its addition to isotactic polypropylene to improve the flow properties and to reduce the incompatibility resulting from molecular weight mismatch of NR/PP thermoplastic blends. Mixing energy curves of uncrosslinked blends and those of dynamically vulcanized blends crosslinked using different cure systems were compared. The mixing energy curves of blends containing NR of different molecular weight (M _n) and two grades of PP (injection and film grades) were also compared. Technological and processing properties of the dynamically vulcanized (sulphur and peroxide cure systems) and unvulcanized blends were compared with those of the samples containing unmasticated NR. The results indicated that a number average molecular weight in the range 4 × 10⁵ for NR increased the procoessability without significantly affecting the technological properties of NR/PP thermoplastic blends. Among the three cure systems studied Luperox 101 and dicumyl peroxide gave better technological properties than the sulphur‐cured samples. Two antioxidants, viz. quinoline (TDQ) and imidazole (MBI) type, were tried in NR/PP blends. It was found that TDQ imparts better aging resistance compared to MBI. The improvement in processability due to the reduction in molecular weight of natural rubber by mastication is more noticeable in the case of peroxide vulcanized blends compared to sulphur vulcanized samples. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 2063–2068, 2004     

耐刮擦、高流动PP/SEBS热塑性弹性体的研制

采用熔融共混法制备了聚丙烯(PP)/氢化苯乙烯–丁二烯–苯乙烯嵌段共聚物(SEBS)热塑性弹性体,研究了乙烯丙烯酸酯共聚物润滑偶联改性剂(YY–503和YY–5031)、芥酸酰胺和高分子量硅酮(E525)4种改性剂对PP/SEBS弹性体的加工性能、力学性能和耐刮擦性能的影响。结果表明,4种改性剂的加入能显著提高弹性体的熔体流动速率(MFR),添加YY–503和E525的弹性体MFR提升更为显著,分别为12.6 g/10 min和13.5 g/10 min,比未添加时提高了2 471.4%和2 655.1%;添加芥酸酰胺的弹性体拉伸强度和断裂伸长率最低,比未添加改性剂时分别下降了58.5%和63.2%,添加YY–503和YY–5031的弹性体拉伸强度分别为10.6 MPa和9.8 MPa,比未添加改性剂时分别提高23.2%和19.5%;未添加改性剂弹性体的色差值(ΔL)为18.5,而添加YY–503和YY–5031的弹性体ΔL仅为1.3和1.5;扫描电子显微镜测试发现,添加YY–503和YY–5031的弹性体中没有出现明显孔洞,碳酸钙良好分散,与基体结合力良好。添加质量分数为2%的YY–503可获得力学性能、加工性能和耐刮擦性能优异的PP/SEBS弹性体。     

聚丙烯/超高摩尔质量聚乙烯共混物的结构与性能研究

研究了不同物料比和加工工艺对聚丙烯（PP）／超高摩尔质量聚乙烯（UHMWPE）共混体系性能的影响。结果表明，PP／UHMWPE共混体系具有比音一组分更高的冲击性能，当体系中UHMWPE的质量分数为60％时，共混物的冲击强度高达101kJ/m^2，分别是PP的1．8倍和UHMWPE的1．3倍，将UHMWPE加入PP中可明显降低PP的摩擦系数，提高其耐磨性，而适量UHMWPE加入PP中，对UHMWPE的耐磨性能无不良影响，对以PP为连续相的共混体系，混炼方式对共混物的性能影响大，偏光显微镜分析表明，当PP／UHMWPE共混体系中UHMWPE的质量分数大于40％时，就很难观察到明显的PP大球晶结构，DSC分析显示，PP／UHMWPE共混物出现了两纯组分熔点的结晶熔融峰，PP／UHMWPE为热力学不相容体系。     

Influence of polyamide 6 as a charring agent on the flame retardancy,thermal, and mechanical properties of polypropylene composites

In this work, polyamide 6 (PA6) as a charring agent has been used in combination with thermoplastic polyurethane (TPU)‐microencapsulated ammonium polyphosphate (MTAPP) forming intumescent flame retardants (IFRs) which applies in polypropylene (PP). The effects of the IFRs on the flame retardancy, morphology of char layers, water resistance, thermal properties and mechanical properties of flame‐retardant PP composites are investigated by limiting oxygen index (LOI), UL‐94 test, scanning electron microscopy (SEM), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and mechanical properties test. The results show that the PP/MTAPP/PA6 composites exhibit much better flame‐retardant performances than the PP/MTAPP composites. The higher LOI values and UL‐94 V‐2 of the PP/MTAPP composites with suitable amount of PA6 are obtained, which is attributed to the thick and compact char layer structure evidenced by SEM. The results from TGA and DSC demonstrate that the introduction of PA6 into PP/MTAPP composites has a great effect on the thermal stability and crystallization behaviors of the composites. Furthermore, the mechanical properties of PP/MTAPP/PA6 composites are also improved greatly due to the presence of PA6 as a charring agent. POLYM. ENG. SCI., 55:1355–1360, 2015. © 2015 Society of Plastics Engineers     

高速BOPP专用料的开发

利用4个反应器串联的Hypol工艺进行高速BOPP专用料的研制开发，通过聚合工艺参数的调整，生产高速BOPP专用料YF3003；从常规物性、热行为、核磁共振谱、相对分子质量及其分布、加工性能等几方面对YF3003试验料和进口高速BOPP料A，B进行分析表征。结果表明．YF3003的物理性能及加工性能与进口料相当，同时，YF3003的加工应用试验也证明它能满足高速BOPP薄膜的生产，且薄膜的热收缩性能特别优异。     

Solid-State Photolysis of Azobis-3-Phenyl-3-Pentane. Crystal-Lattice Control of the Stereochemistry of Radical Disproportionation

The 3-phenyl-3-pentyl radicals from photolysis of azobis-3-phenyl-3-pentane (APP) in solution give 3,4-diethyl-3,4-diphenylhexane and a photolabile product assumed to arise by para coupling. Photolysis of APP as a crystalline solid at ?78° gives the disproportionation products 3-phenylpentane (PPH) and 3-phenyl-2-pentene (PP) as a 3:1 mixture of the E and Z isomers. This stereoisomeric ratio is surprising in terms of the solid-state molecular conformations, for which a topochemical scheme predicts predominance of the Z isomer. Isotopic distributions in PPH, Z-PP and E-PP from photolysis of solid APP which was 82% deuterated in its methylene groups shows: (1) that Z-PP is formed under strong lattice control; (2) that E-PP is formed in a process with greater, but not complete, molecular freedom; and (3) that there is often a dynamic competition for hydrogen-atom donation between the two radicals involved in disproportionation.