HDPE新牌号树脂的研究

根据扬子石化公司开发HDPE新牌号产品的生产经验,从分子量及分子量分布与树脂性能的关系、密度对HDPE性能的影响、HDPE的共聚改性、HDPE的共混改性、添加剂与HDPE改性等5个方面讨论了HDPE新牌号产品开发的方法。     

宁夏石化推出纤维级聚丙烯树脂新品

正2016年6月16日,宁夏石化新牌号聚丙烯产品NX40S试生产成功,共生产高熔体流动指数(熔指)聚丙烯树脂产品653 t,有力提升了聚丙烯产品市场竞争力,为开发更高熔指的高端聚丙烯产品积累生产经验。新牌号高熔指聚丙烯产品NX40S与旧牌号低熔指聚丙烯T30S相比有很多优势,可生产无纺布、丙纶制品,广泛应用于口罩、尿不湿、高级包装等生活用品。     

国内炼厂气制聚丙烯现状及发展探析

简要分析了中国炼厂气制聚丙烯生产规模、原料质量及产品性能等,并与乙烯裂解制聚丙烯和煤制聚丙烯进行了对比。进而对国内炼厂气制聚丙烯产品的主要应用现状、存在差距进行了分用途、分牌号的分析探讨。最后,针对炼厂气制聚丙烯的产品技术特点,在今后生产控制、产品开发、新用途开发、功能改性等方面提出了建议。     

聚丙烯装置开工前安全审查

一、装置简介 大连石化分公司20万t聚丙烯装置是大连石化分公司“十五”发展计划中的一个配套项目,设计能力20万t／a。该装置采用意大利Basell公司的Spheripol二代聚丙烯工艺技术,与Spheripol一代工艺相比较,有了较大的改进与提高。工艺技术采用第四代催化剂体系,通过应用双环管结构的聚合反应器,可生产一些新牌号的产品。预聚合和聚合反应器的设计压力等级提高,使新牌号的性能更好,老牌号的产品性能得以改进,也更利于对形态、等规度和分子量的控制。本装置由意大利TECNIMONT公司负责基础设计,     

透明聚丙烯专用料的结构与性能分析研究进展

近年来我国透明聚丙烯发展迅速，开发透明聚丙烯新牌号替代进口料、满足市场需求是当前急需解决的问题。调控聚丙烯的聚合原理、共聚单元种类及其含量、成核剂的使用以及共混等方法可以在一定程度上提高聚丙烯的光学性能。因此，研究透明聚丙烯微观结构，有助于深入理解聚丙烯宏观性能，从而建立微观结构与宏观性能之间的关系，对指导产品工艺控制、提升透明聚丙烯性能、开发高性能透明聚丙烯专用料具有重要意义。     

茂金属聚丙烯催化体系研究新进展

聚丙烯具有良好的耐热性能、力学性能和化学稳定性，广泛应用于医疗卫生、食品包装和汽车部件等领域。茂金属催化体系可以通过调节茂金属配体结构精确控制聚合物微观结构，推动了传统催化体系无法实现的独特窄相对分子质量分布、高规整度等规和间规聚丙烯等产品的发展。从催化剂结构调控聚丙烯性能的角度，综述了近年来等规、间规、无规、齐聚聚丙烯、二元催化体系及添加剂的影响等茂金属聚丙烯催化体系新进展，对国内茂金属聚丙烯产品的工业开发应用前景进行了展望。     

国外复合材料用高级增强纤维的发展现状

本文综述了国外碳纤维、陶瓷、聚芳酰胺、超高分子量聚乙烯、液晶聚合物纤维的发展现状,包括它们的生产能力、消费情况、性能特点,主要生产国和生产公司、产品牌号以及应用领域等,并指出了其生产进展和发展动向。     

大型聚丙烯生产装置牌号切换滚动时域控制

基于滚动时域优化控制策略,提出了一种大型双环管聚丙烯生产过程最优牌号切换控制方法。首先结合机理分析,以Hammerstein模型描述聚丙烯牌号切换过程中质量指标动态特性;其次,根据牌号切换的性能指标,滚动优化计算每个时刻各反应器中聚合温度、氢气与丙烯浓度比、共聚单体乙烯与丙烯浓度比等操作变量。进一步结合双层控制结构和状态观测器设计,实现聚丙烯产品牌号切换的滚动优化闭环控制,并预测聚合物产品各质量指标的动态轨迹。最后,通过给出多个牌号切换实例仿真验证本文结果的有效性和实用性。     

燕化开发新牌号共聚聚丙烯

由燕山石化公司承担的汽车用新牌号共聚聚丙烯项目目前通过鉴定.为了使国产汽车用聚丙烯专用料替代进口产品,该公司在开发专用料的过程中,解决了聚合、造粒、操作等诸多难题,生产出PP1340、PP1540和PP1740等3个牌号的产品,并形成规模化生产能力.     

气相丙烯聚合用BCZ型催化剂的性能及应用

研究了丙烯聚合用BCZ型Ziegler-Natta催化剂的3个产品——BCZ-108,BCZ-208,BCZ-308在气相Innovene工艺装置上生产和开发的各种聚丙烯牌号的性能。结果表明:颗粒状BCZ型催化剂综合性能优良,适于在无预聚合单元气相装置中使用,装置运行稳定,聚合物粉料颗粒形态保持良好,细粉少;BCZ-108适用于均聚、无规共聚以及抗冲共聚聚丙烯的生产;BCZ-208活性高,定向能力高,氢调敏感性好,生产的聚丙烯可溶物少,适用于高性能纤维专用树脂、高熔体流动速率无规共聚和均聚物的生产;BCZ-308氢调不敏感,生产的聚丙烯相对分子质量分布宽,加工性能好,适用于低熔体流动速率、宽相对分子质量分布聚丙烯的生产和开发。     

我国塑料助剂的现状及发展趋势

介绍了我国塑料助剂种类、行业现状及未来发展趋势，包括改性剂、加工助剂等，并对我国塑料助剂新产品的开发情况提出了一些设想和建议。     

有机硅下游产品技术发展趋势

有机硅下游产品的技术发展趋势是高性能、多功能和复合化,即通过改变交联方式,配合技术的进步和添加新的添加剂,通过共聚共混等改性技术实现有机聚合物与有机硅材料复合。     

正丁烯骨架异构化催化剂的研究

成功合成了YZ-2型正丁烯异构化催化剂。以醚后混合碳四为原料,无任何稀释气体,在固定床反应器装置上考察了催化剂对正丁烯异构化的催化性能,探讨了工艺条件对异构化产物分布的影响,考察了催化剂性能的稳定性。结果表明:YZ-2型催化剂在正丁烯骨架异构化上具有较好的催化性能和稳定性。     

我国聚烯烃牌号的开发

讨论了目前国内聚烯烃树脂牌号的现状以及独立自主开发新牌号的重要性。树脂牌号开发中２个关键问题是：（１）高分子分子结构的设计,（２）如何在工业装置上加以实现,并提出了牌号开发中应注意的专利侵权问题,对今后如何加强树牌号开发提出了建议。     

聚合物微米层共挤成型技术及其应用

介绍一种新的聚合物微米层共挤成型技术。首先介绍微米层共挤成型的概念、工艺过程及其工艺条件,并对微米层共挤制品的独特性能进行了详细描述,最后综述了近几年国内外对微米层共挤成型的研究和应用情况,并对其发展前号进行了展望。     

Thermal Stability of Polymer Additives: Comparison of Decomposition Models Including Oxidative Pyrolysis

The thermo‐oxidative stability of widely used polymer additives has been investigated. A comparative analytical approach with classic and innovative decomposition models for polymer additives was conducted and the results supported using quantum‐chemical calculations. Unique pyrolysis products of the analytes were compiled utilizing pyrolysis online coupled to gas chromatography followed by mass spectrometric detection (Pyr‐GC–MS). The pyrolysis was either performed under inert conditions or in an oxygen‐containing atmosphere. Squalane was applied as polymer‐mimicking liquid next to low density polyethylene (LDPE) and polyamide 6 (PA 6) as matrices for 10 selected additives. The additives included in this study range from antioxidants and plasticizers to processing aids. These were selected to address a range of application in consumer products and to cover different chemical classes. The toxicological relevance of additives and potential breakdown products was considered. Consequently, degradation of sterically hindered antioxidants, diarylamines, and a trimellitic acid derivative was investigated. The findings were used to predict the behavior of consumer products made of polymeric materials entailing additives. The level of Antioxidant 2246 [2‐tert‐butyl‐6‐[(3‐tert‐butyl‐2‐hydroxy‐5‐methylphenyl)methyl]‐4‐methylphenol] and one of its predicted decomposition products was determined in baby bottle nipples made of natural rubber [2‐tert‐butyl‐4‐methylphenol] utilizing the complementary technique of gas chromatography coupled to tandem mass spectrometry (GC–MS/MS). This study provides a comprehensive characterization of important polymer additives and enables the prioritization of degradation products for further risk assessment. J. VINYL ADDIT. TECHNOL., 25:E12–E27, 2019. © 2018 The Authors. Journal of Vinyl and Additive Technology published by Wiley Periodicals, Inc. on behalf of Society of Plastics Engineers     

世界导电塑料工业化进展

介绍了用于导电塑料制造的新型导电添加剂如导电炭黑、碳纳米管、导电钛酸钾晶须、纳米石墨微片等的工业化开发与应用。重点综述了具有高性能特殊用途的导电塑料品种、本征导电型及离子导电型塑料合金技术、母料技术等的工业化进展。列举出许多国际知名厂商的相关新产品牌号,为导电塑料新产品开发提供参考。     

Photosensitized degradation of polyolefins. II

The oxydative photodegradation of polyethylene sensitized by aromatically substituted dienes such as 1,6-diphenyl-1,3,5-hexatriene (DPH) and 1,4-diphenyl-1,3-butadiene (DPB) has been investigated. The rate of degradation has been monitored by following the change of the mechanical properties of the polymer during accelerated indoor aging tests. It was found that both additives are efficient sensitizers of the photodegradation of polyethylene. The mechanism of photo-oxidation has been investigated by ESR and IR spectroscopy and it has been interpreted on the basis of a complex mechanism which includes excited singlet oxygen (¹O₂) and the products of photodegradation of the additives. Singlet oxygen, produced by DPB and DPH and/or by impurities present in the polymer, reacts with the additives themselves and, directly, with polyethylene. In turn, the products of photodegradation of the additives react with the polymer via hydrogen atom abstraction, further promoting the photodegradation. Irradiation carried out in absence of air seems to rule out the possibility of direct hydrogen atom abstraction by DPB and DPH.     

Agilent provides fast identification of antioxidants in plastics

Agilent Technologies Inc has devised a method based on advanced chromatography that allows rapid identification of antioxidant additives and their degradation products in plastics formulations. The company believes this will aid in developing plastic products with better performance.This is a short news story only. Visit www.adcomp.com.com for the latest additives and compounding industry news.