超高分子量聚乙烯纤维级专用料的开发

超高分子量聚乙烯(UHMWPE)纤维具有许多卓越的性能,被广泛应用于工业及一些特殊领域.本文对国内UHMWPE纤维用原料的性能以及纤维的性能进行对比分析,包括原料的分子量、颗粒形态、热性能以及纤维的力学性能,为开发UHMWPE纤维级专用料提供参考,以提高国产UHMWPE纤维的性能.     

通信电缆用聚乙烯绝缘料流变性能分析

分别采用转矩流变仪和毛细管流变仪,在相同的试验条件下,测定日本UBEC180、国产CQS911及兰化D1.3通信电缆用聚乙烯绝缘料在高剪切速卑下和低剪切速率下的流变行为,对比分析了进口和国产聚乙烯绝缘料的流动性和流动时发生形变的特性,以揭示进口料和国产料的加工性能,为国产料的适用性提供理论依据。     

聚乙烯管材专用料的结构与性能

利用凝胶渗透色谱(GPC)、差示扫描量热法(DSC)、J积分法和动态力学分析(DMA)等研究了聚乙烯管材专用料的分子量分布和共聚单体对其结晶行为、断裂韧性和耐蠕变性能的影响。结果表明,相对于单峰分子量分布的共聚聚乙烯而言,双峰分子量分布的均聚聚乙烯结晶度从54.5%增加到60.9%,断裂韧性从5.85 kJ/m2提高到6.67 kJ/m2。此外,拉伸性能和耐蠕变性能也得到提高。     

纸型低密度PE通过鉴定

天津石化乙烯自主研发的微膜级纸型低密度聚乙烯专用树脂DFDA-9020及大棚专用料纸型低密度聚乙烯DFDA-9085两项新产品,日前通过技术鉴定.产品均达到同类国际先进水平.新产品DFDA-9020微膜专用料树脂的大规模工业化投产,填补了国内线型低密度聚乙烯产品的空白,基本替代了进口树脂原料.DFDA-9085大棚膜     

中密度聚乙烯材料的焊接性能研究

本文讨论了两种不同流动性能的中密度聚乙烯输气管材专用料的焊接性能,试验考察了焊接参数对焊接接头拉伸力学强度的影响,确定了适用于这类材料的最佳焊接工艺参数及其变化范围。对于这两种材料的相互焊接性能也进行了试验分析,提出了一条在一定条件下熔融指数乘以热透时间应成为不变量的普适性准则。     

国内聚乙烯市场变化

据业内专家预测，未来国内聚乙烯市场将会发生如下的变化：国内产能将快速增长，到2010年将达到1700万吨左右，市场竞争将更加激烈，进口依赖将会降低，国产料出口量将会增加；国内需求仍将保持较快的增长速度，预计未来5～10年内增长率将保持在6％～8％；产品结构将发生变化，国产专用料比例将进一步提高；塑料加工企业及制品将升级换代，优胜劣汰，专料专用，同时制品质量和出口将得到稳步提高。     

流延聚乙烯专用料ZF4533H和ZF4527C的研究与应用

介绍了中国石化镇海炼化流延聚乙烯专用料ZF4533H和ZF4527C的研究,分析对比了市场常用的线性聚乙烯树脂与ZF4533H和ZF4527C在流延聚乙烯薄膜制造过程中应用效果。结果表明:使用ZF4533和ZF4527C专用料,流延聚乙烯薄膜膜面不会氧化变色、小分子迁移析出少、外观瑕疵点少,气味低,薄膜纵横向拉伸强度一致、厚薄度偏差小、透明度高、雾度低。     

高温拉伸制备交联聚乙烯微孔膜的探索研究

采用热拉伸-高温退火-冷拉的拉伸工艺制备了交联聚乙烯微孔膜,考察了交联聚乙烯的交联度、拉伸温度、退火温度和冷拉等工艺条件对交联聚乙烯微孔膜成孔性能的影响,并对成孔过程和机理进行了探讨.交联聚乙烯的交联度显著影响成孔性能,随着交联度的增加,成孔性增加.拉伸温度在90～120℃时,膜片基本由纤维状晶构成.拉伸温度升至130℃,并在此温度进行高温退火处理,膜片开始出现细缝状微孔.施加冷拉可以调控细缝状微孔形态演变,进一步被拉伸成圆形或椭圆洞状微孔.本文所用拉伸工艺为制备高性能聚乙烯微孔膜提供了一种新的思路,有助于开发自主知识产权的聚乙烯微孔膜技术,突破锂离子电池隔膜等高端聚乙烯微孔膜的国外技术垄断.     

拉伸薄膜与拉伸包装工艺

<正> 拉伸薄膜拉伸薄膜(也叫缠绕膜)在包装过程中,不需要进行热收缩处理,适用于某些不能受热的产品的包装,有利于节省能源,便于集装运输,降低运输费用。(1)拉伸包装的性能指标用于拉伸的塑料薄膜必须具有一定的自黏性、韧性、拉伸率、应力滞留和需用拉伸范围以及光学性能和热封性能等。     

2003年12月份部分其他化工新材料市场参考价格

产品名称规格型号产地价格 (元 /吨 )高氯化聚乙烯特种防腐磁漆国产 2 2 80 0高氯化聚乙烯特种防腐阻燃漆国产 2 4 0 0 0高氯化聚乙烯特种防锈底漆国产 1 4 0 0 0环氧系导电聚苯胺防腐涂料国产 1 1 80 0 0降解母料(吹膜专用)UMC1 8常温降解国产 1 30 0 0降解母料(吹膜专用)光照     

LDPE/LLDPE/分子筛保鲜包装膜的力学性能和摩擦性能研究

以低密度聚乙烯(LDPE)和线性低密度聚乙烯(LLDPE)(质量比为80∶20)作为基础物质,添加不同比例的分子筛,吹制保鲜膜,研究了保鲜膜的力学性能和摩擦性能。研究表明:随着分子筛含量的增加,薄膜的拉伸强度、伸长率、耐戳穿强度和撕裂强度均出现一定程度的下降;加入分子筛之后,保鲜膜的摩擦系数上升。     

LDPE / LLDPE / EVA 三元共混膜的力学性能和摩擦性能研究

以低密度聚乙烯(LDPE)和线性低密度聚乙烯(LLDPE)作为基础物质,添加乙烯-醋酸乙烯酯共聚物(EVA),吹制保鲜膜,研究了保鲜膜的力学性能和摩擦性能。研究表明,复合膜的拉伸强度、伸长率、耐戳穿强度和撕裂强度随着EVA含量的增加,总体呈下降趋势,摩擦系数则逐渐上升。     

基于环境绩效的烟草商业物流可降解薄膜包装优化研究

目的 在兼顾环境影响和经济效益的基础上,运用科学的分析手段为烟草商业物流可降解薄膜优选及包装工艺升级提供决策参考。方法 本文从可降解薄膜的力学性能及其包装方式入手,以生命周期评价法所确定的可降解薄膜环境影响潜值和相关经济指标作为基础数据,运用基于松弛测度的非径向、非角度的数据包络分析模型(SBM-DEA)开展烟草商业物流可降解薄膜包装的环境绩效评价及冗余度分析。结果 根据8种可降解薄膜的力学性能确定了3种包装方式,不同包装薄膜的生命周期环境影响潜能总值从大到小依次为C、D、E、LDPE、A、B、G、F、H。根据环境绩效测算所确定的可降解薄膜包装优选方案为A+缠绕包装I和G+缠绕包装I。结论 生命周期环境影响评价有助于全面分析可降解薄膜的环境友好性,可降解薄膜的缠绕包装具有突出的环境绩效优势,工艺升级和包装效率改进是提升烟草商业物流可降解薄膜包装环境绩效的入手点。     

聚酰亚胺的侧链功能化

侧链功能化的聚酰亚胺是一类特殊的高性能聚合物,可用来制备非线性光学材料,绝缘薄膜,耐高温气液分离膜,射线屏蔽膜,柔性印刷电路板基膜和宇来得及航材料等,用于航天航空。国防军工,电子,电机电器,核动力学各个工业领域。本文就近１０年来国内外对聚酰亚胺侧链功能化的研究现状和应用前景进行了综述。     

Enhancing the supercapacitor performance of graphene/MnO2 nanostructured electrodes by conductive wrapping

MnO2 is considered one of the most promising pseudocapactive materials for high-performance supercapacitors given its high theoretical specific capacitance, low-cost, environmental benignity, and natural abundance. However, MnO2 electrodes often suffer from poor electronic and ionic conductivities, resulting in their limited performance in power density and cycling. Here we developed a "conductive wrapping" method to greatly improve the supercapacitor performance of graphene/MnO2-based nanostructured electrodes. By three-dimensional (3D) conductive wrapping of graphene/MnO2 nanostructures with carbon nanotubes or conducting polymer, specific capacitance of the electrodes (considering total mass of active materials) has substantially increased by ～20% and ～45%, respectively, with values as high as ～380 F/g achieved. Moreover, these ternary composite electrodes have also exhibited excellent cycling performance with >95% capacitance retention over 3000 cycles. This 3D conductive wrapping approach represents an exciting direction for enhancing the device performance of metal oxide-based electrochemical supercapacitors and can be generalized for designing next-generation high-performance energy storage devices.     

Epitaxial and graphoepitaxial growth of materials on highly orientated PTFE substrates

The mechanism by which friction-deposited, highly orientated poly(tetrafluoroethylene) (PTFE) films promote orientated growth of materials was investigated. For this purpose, transmission electron microscopy was used to determine the orientation of polyethylene and 1,4-bis-2-(5-phenyloxazolyl)benzene (POPOP) crystals grown from the vapour phase onto the single crystal like PTFE films. Electron diffraction patterns revealed that the polyethylene crystals adopted an orientation that minimized the lattice mismatch at the interface between this material and the PTFE substrate. On the other hand, the POPOP crystals aligned in a fibre pattern, implying that orientated growth occurred because of the grating-shaped surface topography of the PTFE films. Evidently, the latter films were capable of promoting orientated growth of materials by a graphoepitaxial mechanism or conventional epitaxy, depending on the material used.     

Morphology of polyethylene nanolayers: a study by evanescent light microscopy

Thin films morphology investigation of polyethylene by the differential evanescent light intensity (DELI) imaging method has been performed. The films of nanometer thickness were obtained by the matrix-assisted pulsed laser evaporation (MAPLE) technique. MAPLE was demonstrated to be suitable for the synthesis of organic materials in form of nanostructures. To prepare targets, 3% polyethylene powder was dissolved in toluene and frozen at liquid nitrogen temperature. In MAPLE, the organic material is protected by the frozen solvent against the direct laser and plasma action. Polyethylene thin films of various thicknesses, below 200 nm, were thus fabricated by varying the deposition conditions. We applied the DELI microscopy technique for fast and low cost morphology investigation of large polyethylene nanolayer zones. A phenomenological model for the interaction between the evanescent waves and the deposited material is presented.     

惰性气体带水法合成甲基丙烯酸聚乙二醇单甲醚(1200)酯的研究

采用惰性气体带水法,以对甲苯磺酸为催化剂,对苯二酚为阻聚剂,以甲基丙烯酸(MAA)和聚乙二醇单甲醚(MPEG)为原料直接酯化合成了甲基丙烯酸聚乙二醇单甲醚酯(MPEGMAA).考察了单体摩尔比、阻聚剂用量、催化剂用量以及反应时间等条件对酯化率的影响,并通过红外光谱分析表征了酯化产物的结构.研究结果表明:当n(MAA)∶...     

TMP/蔗糖改性鞋用水性聚氨酯胶粘剂的合成及性能表征

以聚乙二醇(PEG)、异佛尔酮二异氰酸酯(IPDI)为基料.三羟甲基丙烷(TMP)、蔗糖为交联剂改性制备水性聚氨酯胶粘剂.通过差示扫描量热(DSC)、凝胶渗透色谱(GPC)和激光粒度仪等考察了TMP含量对水性聚氨酯乳液和胶膜性能的影响,确定TMP在蔗糖体系中的最佳含量,并将制备的胶粘剂用于不同鞋材的粘接.结果表明,随着...     

Deformation capacity of RC piers wrapped by new fiber-reinforced polymer with large fracture strain

One of the major drawbacks of structure strengthening by fiber reinforced polymer wrapping using materials such as CFRP and AFRP, whose strength and stiffness are high, is the brittle nature of failure mode, which is caused by fracture of the fiber due to low fracturing strain. A series of experiments were conducted to investigate the efficiency of using two new types of fibers, polyethylene naphthalate (PEN) and polyethylene terephthalate (PET) fiber, for seismic strengthening of RC piers. These fibers have the properties of low stiffness and high fracturing strain. Specimens strengthened by PET and PEN fiber sheets wrapping showed considerable improvement in shear capacity and ductility compared to the control specimen. Both PET and PEN showed no tendency to fiber breakage before the pre-defined ultimate deformation. Pier behaviors such as shear deformation and strain development in both fiber and steel shear reinforcement, and the piers, ultimate failure modes, were carefully examined. Shear deformation increases rather rapidly after peak load and concrete shear capacity decreases with the increase in shear deformation. Stiffness of fiber affects the development of shear deformation and the descending branch of the load–deformation curve after the peak load. A simple model to predict the piers deformation capacity, based on the experimental results, was proposed.