CPP膜专用树脂的开发

结合聚丙烯生产装置和市场的特点,有针对性地提出流延聚丙烯膜专用树脂YPF 3008的开发目标,控制熔体流动速率、树脂产品的均匀性、等规指数及灰分等,成功生产了YPF 3008。经加工厂家应用表明,该树脂能满足进口流延膜生产线的高速加工。     

分散聚四氟乙烯树脂加工为短纤维的影响因素

介绍了分散聚四氟乙烯(PTFE)树脂加工为短纤维的影响因素。能够满足短纤维加工需求的树脂要求原始粒子形态为球状、分子量分布均匀、标准相对密度为2.16~2.185。短纤维专用分散PTFE树脂在加工应用过程中,表现出良好的吸油性和成纤性能,能够获得拉伸强度高、线密度分布集中的短纤维。     

聚苯乙烯光纤专用树脂的工业开发

根据光纤专用树脂的要求,确定产品的技术指标及生产工艺,开发出聚苯乙烯光纤专用树脂PS 670。与国内光纤专用树脂相对比,PS 670具有优良的加工性能和导光性。加工应用实验表明,PS 670导光性能满足国内光纤生产厂家的质量标准要求,可以进行批量的工业化生产。     

旋转成型专用树脂MLPE-8050的开发

通过研究抗氧剂和光稳定剂的协同作用,提出了合理的添加剂配方,并将该配方应用到中密度聚乙烯旋转成型专用树脂MLPE-8050的生产中。采用该专用树脂制备的制品能够达到长期使用的特殊要求,其氧化诱导期可达142.0 min,光老化时间大于2 000 h。     

BOPP烟用包装膜专用树脂结构性能研究

对气相法聚丙烯生产的双向拉伸聚丙烯(BOPP)烟用包装膜专用树脂F 1002进行了结构性能研究。研究结果表明，烟用包装膜专用树脂具有特征性分子量及其分布，即既含有较高的分子量组分，又含有适量低分子量组分，从而保证其在双向拉伸成型工艺中具有较高的熔体强度及熔体流动稳定性，使得制品厚度均匀性优异。同时，适宜的等规指数(96．5％～97．5％)及其等规序列分布特性，使采用均聚型烟用包装膜专用树脂加工成型的BOPP薄膜具有挺度高，满足烟用包装膜的特性要求。     

全密度装置高强度聚乙烯薄膜专用树脂的生产与应用

在大庆石化公司全密度聚乙烯(FDPE)装置上采用Unipol气相法工艺、丁烯-1为共聚单体生产高强度聚乙烯薄膜专用树脂,牌号为DGDB 6097。DGDB 6097的熔体流动速率(I2 1.6)为7~13 g/(10 min),密度为0.945~0.951 g/c m3,拉伸屈服应力大于或等于19 MPa,拉伸断裂应力大于或等于23 MPa,断裂标称应变大于或等于500%。与相同工艺的通用薄膜专用树脂DFDA 7042相比,DGDB 6097树脂的密度高、拉伸强度大,强度优势明显;与同类产品高强度薄膜专用树脂DGDA 6098相比,力学性能、结晶性能、分子质量、分子质量分布及薄膜各项性能等均相当。DGDB 6097产品在大庆龙阳塑料制品有限公司吹塑生产手提袋等高强度薄膜,加工应用表明该树脂的加工性能和薄膜力学性能均满足用户和国家标准(GB 12025)要求。     

PE100级管材专用树脂的结构和性能

对两种采用不同工艺生产的PE100级管材专用树脂(分别记作树脂A和树脂B)进行了结构剖析和管材加工性能评价。结果表明:与树脂A相比,树脂B的共聚单体含量少,重均分子量大,相对分子质量分布略窄,结晶度高,零剪切黏度高,熔体强度大;相同加工温度条件下,树脂A的加工流动性好,树脂B的抗熔垂性好;两种树脂所制管材的静液压强度、耐慢速裂纹增长性能与耐快速裂纹扩展性能均满足国家标准要求。     

镀铝级PP流延膜专用树脂的开发

在对市场调研的基础上,针对聚丙烯(PP)流延膜加工厂家的要求和PP生产装置的特点,确定了镀铝级PP流延膜专用树脂CP38F的技术指标(如熔体流动速率为6.0～9.0 g/10 min,等规指数为96.0%等)和生产工艺条件,并进行了试生产和产品的加工应用试验.经加工厂家应用表明,该树脂能满足镀铝级流延膜的加工要求.     

S-1000A新型PVC专用树脂通过鉴定

2005年5月,中国石化齐鲁石化股份有限公司树脂研究所开发的PVC树脂S-1000A通过中国石油化工集团公司鉴定。专家认为．该专用树脂性能达到国外同类产品的先进水平．在型材和管材应用中有明显的优势,能满足高速型材、管材加工设备的技术要求．生产的型材和管材完全满足相关国家标准的要求。     

S-1000A新型PVC专用树脂

齐鲁石化股份有限公司树脂研究所开发的PVC树脂S-1000A新产品通过集团公司鉴定。该专用树脂具有适宜的聚合度和良好的颗粒形态，塑化时间短，流动性能好，加工性能优良，达到国外同类产品的先进水平。通过工艺稳定性调整，跟踪检测数据显示，性能完全达到预期要求。该专用树脂在型材和管材应用中有明显的优势，很好地满足了引进高速型材、管材加工设备的技术要求，生产的型材和管材完全满足相关国家标准的指标要求。     

茂金属线型低密度聚乙烯的结构与性能

利用傅里叶变换红外光谱、凝胶渗透色谱、差式扫描量热法和力学性能测量等手段表征了茂金属线型低密度聚乙烯(mLLDPE)和传统线型低密度聚乙烯(LLDPE)的结构及性能,用热分级法表征了LLDPE的片晶厚度多散性,测试了mLDPE薄膜的相关性能。结果发现,mLLDPE的片晶厚度分布指数为1.1347,小于传统LLDPE,表明其具有更好的支化均匀性,但其相对分子质量分布窄;mLLDPE薄膜具有较高的落镖冲击强度、撕裂强度、热封强度和突出的光学性能。     

薄膜用高性能LLDPE树脂的开发

采用气相流化床工艺,使用钛系催化剂,以1-己烯作共聚单体,采用连续不停车切换生产薄膜用高性能线型低密度聚乙烯树脂。测试结果表明:树脂的各项性能良好,薄膜的落镖冲击破损质量达92 g;拉伸断裂应力达31.7 MPa;拉伸断裂应变达1 183%。     

钢/塑复合管用热熔胶的制备与性能研究

以PE(聚乙烯)接枝母料、线性低密度聚乙烯(LLDPE)为主要原料,石油树脂为增黏树脂,苯乙烯-乙烯-丁二烯-苯乙烯嵌段共聚物(SEBS)为改性剂,采用单因素试验法优选出制备钢/塑复合管用HMA(热熔胶)的最佳配方。结果表明:增黏树脂的引入能明显提高HMA的剥离强度和熔体指数,并且胶接层的破坏形式为内聚破坏;SEBS类弹性体的引入能显著提高HMA的剥离强度,但熔体指数明显降低,而且胶接层的破坏形式是黏附破坏;当m(PE接枝母料)∶m(LLDPE)∶m(石油树脂)∶m(SEBS)=30∶45∶15∶10时,HMA的综合性能相对最好,其剥离强度为397 N/cm、熔体指数为2.3 g/10 min且胶接层的破坏形式是内聚破坏。     

硅烷交联聚乙烯电力电缆绝缘料的研制

采用两步法制备了硅烷交联聚乙烯（PE）电力电缆绝缘料。以双螺杆挤出机为反应器,以低密度聚乙烯（LDPE）和线型低密度聚乙烯（LLDPE）为基础树脂,考察了影响PE接枝交联的主要因素（如基础树脂的配比,交联剂的用量及种类,引发剂、抗氧剂的用量等）,得出了具有良好性能的硅烷交联PE电力电缆绝缘料的配方（质量份数）：LDPE为85．00phr,LLDPE为15．0H0phr,硅烷W为0．60phr,硅烷Q为1．40phr,引发剂为0．12phr,抗氧剂为0．20phr。     

Thermal properties and degradation characteristics of polylactide,linear low density polyethylene,and their blends

Melt blending of linear low density polyethylene (LLDPE) and polylactide (PLLA) was performed in an extrusion mixer with post extrusion blown film attachment with and without compatibilizer-grafted low density polyethylene maleic anhydride. The blend compositions were optimized for tensile properties as per ASTM D 882-91. Based on this, LLDPE 80 (80 wt% LLDPE & 20 wt% PLLA) and M-g-L 80/4 (80 wt% LLDPE, 20 wt% PLLA and 4 parts compatibilizer per hundred parts of resin) were found to be an optimum composition. FTIR reveals that the presence of compatibilizer shifts carbonyl peak hence some increase in interaction between LLDPE and PLLA. Morphological characteristics of the fracture surface of with and without compatibilizer blends were examined by scanning electron microscopy. It shows that use of compatibilizer enhances the dispersions of PLLA in LLDPE matrix. Thermogravimetric (TG) analysis of blends shows the M-g-L 80/4 blend has higher thermal stability among studied blends. The degradation study under different pH of soil compost gives that in alkaline condition and the presence of compatibilizer was favorable for degradation. This blend may be used for packaging application.     

Elongation properties of polyethylene melts

The extensional rheological properties of three grades of polyethylene melts, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), and high density polyethylene (HDPE) were measured using a melt spinning technique under the test conditions with temperature ranging from 150 to 210°C and extrusion rate varying from 11.25 to 22.50 mm s^?1. The results showed that the melt strength decreased with a rise of temperature while increased with an increase of extensional rate. With the rise of extensional strain rate and temperature, the melt extensional viscosity decreased. The extensional stress and viscosity reduced with increasing extrusion velocity when the temperature and extensional rate were constant. Moreover, the melt strength and extensional viscosity of the LDPE resin was the highest and the LLDPE was the lowest under the same experimental conditions. POLYM. ENG. SCI., 2011. © 2011 Society of Plastics Engineers     

Tensile property and interfacial dewetting in the calcite filled HDPE, LDPE, and LLDPE composites

Mechanical properties and complex melt viscosity of unfilled and the calcite (calcium carbonate: CaCO₃) filled high density polyethylene (HDPE), low density polyethylene (LDPE), and linear low density polyethylene (LLDPE) composites using dumbbell bar and film specimens are studied. In addition, the formation of air holes between calcium carbonate and the resin matrix was investigated from the phase morphology and interfacial behavior between the above constituents upon stretching using scanning electron microscopy. The tensile stress and the complex melt viscosity of the calcite filled (50%) polyethylene composites were higher than that of unfilled ones, implying that the reinforcing effect of calcium carbonate. The crack was initiated up to first 50% elongation along the transverse direction and the formation of air holes was originated by dewetting occurring through machine direction in the interface between calcium carbonate surface and HDPE. The propagation mechanism of the air hole formation was proposed to firstly originate by dewetting up to 300% elongation, and enlarged not only by breaking of a superimposed fibril structure, but also by merging effect air holes between fibrous resin matrix. However, the crack propagation was not observed at the very beginning elongation for the calcite filled LDPE and LLDPE systems. Less fibril structure was observed in LLDPE, then LDPE composites. The observed shape and the average size of the air holes were different from system to system. This sort of different interfacial behavior and mechanical properties may arise from different configuration of polyethylene.     

LLDPE电缆料TJDL-9270的开发

介绍了线型低密度聚乙烯(LLDPE)电缆料TJDL-9270的性能特点和开发过程。根据电线电缆应用对树脂加工和机械性能的要求,确定了产品指标和生产技术路线及反应条件。分析了F催化剂产品的生产难点。提出了产品切换过程的关键控制要素。研制的TJDL-9270相对分子质量分布宽,易于加工,产品质量稳定,表面光洁度高,并具有优异的机械性能和耐环境应力开裂性能,完全适应高速电缆料的挤出应用。     

PP-硅橡胶-LLDPE三元共聚物的合成及性能研究

以聚丙烯(PP)为基体树脂,硅橡胶为增韧剂,线性低密度聚乙烯( LLDPE)为辅增韧剂,制备了一系列的PP/硅橡胶LLDPE的三元共聚物,考察了PP填充不同配比的硅橡胶共混物的力学性能.结果表明,随着硅胶含量不断的增加,样条的断裂伸长率,弹性模量,冲击强度逐渐增加,样条的拉伸强度随着硅胶的增加而逐渐减少;LLDPE的加入量为15％时,PP/硅橡胶/LLDPE的三元共混体系力学性能最佳;硅橡胶的加入量为20％时,PP/硅橡胶/LLDPE的三元共混体系具有良好的拉伸性能和冲击强度.