汽车用聚丙烯专用料的研究进展

综述了近年来我国汽车用聚丙烯专用料的研究进展,重点介绍了我国汽车用聚丙烯保险杠专用料、汽车仪表板专用料的最新研究现状,最后指出了我国汽车用聚丙烯专用料的发展方向。     

中国石油化工股份有限公司北京燕山分公司1C7A-1产品介绍

中国石油化工股份有限公司北京燕山分公司(简称燕化公司)现有3套聚乙烯装置,聚乙烯总产能600 kt/a,EVA总产能60 kt/a。各装置生产工艺独特,产品特色鲜明,能生产涂层专用料、农膜专用料、电缆专用料、管材专用料、中空容器专用料、EVA等18个种类136个牌号的产品。     

中国石油化工股份有限公司北京燕山分公司1C7A-1产品介绍

中国石油化工股份有限公司北京燕山分公司(简称燕化公司)现有3套聚乙烯装置,聚乙烯总产能600 kt/a, EVA总产能60 kt/a。各装置生产工艺独特,产品特色鲜明,能生产涂层专用料、农膜专用料、电缆专用料、管材专用料、中空容器专用料、EVA等18个种类136个牌号的产品。     

聚乙烯滚塑专用料的现状及发展

介绍了国内外滚塑成型工艺特点、滚塑专用料的性能特点以及聚乙烯滚塑专用料的研究开发进展,并分析了聚乙烯滚塑专用料市场的现状及需求,针对中国滚塑业存在的问题和发展趋势提出专用料的开发建议.     

聚乙烯树脂专用料的需求量和构成及新产品开发

目前国内市场ＰＥ专用料的产品主要有８ 种,年需求量１２０ 万ｔ,占ＰＥ表观需求量的３０％ ,预计到２０００ 年约需１７８万ｔ。国外开发的ＰＥ专用料新产品主要是具有特种性能的ＶＬＤＰＥ、双峰级分子量ＨＤＰＥ、α－烯烃共聚的ＬＬＤＰＥ树脂以及树脂改性和塑料合金等;国内主要ＰＥ 专用料有棚膜专用料１８Ｂ、中空容器专用料３２００Ｂ、电缆专用料ＳＹ－５３１１、涂层料１８Ｇ 和１Ｃ７Ａ等。     

国内外聚乙烯管材专用料的生产技术

详细论述了国内外聚乙烯管材专用料的生产技术,并介绍了国内外聚乙烯管材专用料前沿技术及产品,对今后我国聚乙烯管材专用料的开发方向提出了建议。     

β-PP管材专用料的研究进展

综述了近年来国内外聚丙烯(PP)管材专用料的发展现状,重点介绍了有关β晶型聚丙烯(β-PP)管材专用料的制备方法,并对β-PP管材专用料——尤其是β晶型无规共聚聚丙烯(β-PPR)管材专用料的发展前景进行了展望。     

中国石油化工股份有限公司北京燕山分公司三元共聚聚丙烯产品介绍

中国石油化工股份有限公司北京燕山分公司(简称燕山石化公司)化工二厂现有3套聚丙烯生产装置,聚丙烯总产能达450kt/a以上。各装置的生产工艺先进,产品特色鲜明,能够生产管材专用料、洗衣机专用料、汽车专用料、医用料、薄膜料等,     

汽车耐磨球座聚酯弹性体专用料的结构及性能

本文对用于制作汽车耐靡球座聚酯弹性体专用料进行了研制,并用红外光谱、X—光宽角衍射、GPC、DSC等分析手段对所合成专用料进行了结构表征,测定了专用料的耐磨性能和主要力学性能,确定了专用料的注射成型工艺条件     

中国石油化工股份有限公司北京燕山分公司1C7A-1产品介绍

中国石油化工股份有限公司北京燕山分公司(简称燕化公司)现有3套聚乙烯装置,聚乙烯总产能600 kt/a,EVA总产能60 kt/a。各装置生产工艺独特,产品特色鲜明,能生产涂层专用料、农膜专用料、电缆专用料、管材专用料、中空容器专用料、EVA等18个种类136个牌号的产品。1C7A-1为180 kt/a高压釜式法装置生产的低密度聚乙烯液体无菌包装专用料,具有熔体流     

Mechanical properties of maleic anhydride treated jute fibre/polypropylene composites

Abstract

The effect of maleic anhydride (MA) modification of jute fibre on the mechanical properties of jute/polypropylene (PP) composites was studied. Jute fibre, an environmental friendly, low-density renewable material was chemically modified with MA before the incorporation with PP to improve interfacial adhesion between them. Fourier transform infrared (FTIR) study showed that the C=C groups of MA attached to jute cellulose reacted with the PP matrix. Jute fibre/PP composite treated with MA displayed higher Young's modulus and dynamic storage modulus owing to the enhanced interfacial adhesion between the fibre and PP matrix. A scanning electron microscopy (SEM) study showed evidence of the enhanced adhesion and bridging in the interfacial region of the composite as the result of MA modification of jute fibre.     

Influence of surface characteristics on the adhesion of Alcaligenes denitrificans to polymeric substrates

The adhesion of Alcaligenes denitrificans to several polymeric materials was investigated. As the nature of the surfaces of the micro-organisms and the substrate materials is an important factor in the adhesion process, characteristics such as the electrokinetic potential and hydrophobicity were also determined and correlated with the capacity of bacterial cells to adhere to solid surfaces. The substrates used were high-density polyethylene (HDPE), polypropylene (PP), poly(vinyl chloride) (PVC), and poly(methyl methacrylate) (PMMA). The electrokinetic potential of the cells and the substrates was determined by measurements of electrophoretic mobility and the hydrophobicity was determined by contact angle measurements. All the substrates studied as well as the bacterial strain have a negative zeta potential, which means that adhesion is not mediated by electrostatic interactions. As far as hydrophobicity is concerned, PP is the most hydrophobic material, PMMA is the least hydrophobic, whereas HDPE and PVC present an intermediate behavior. As bacteria cells are hydrophilic, adhesion is favored to PP; therefore, this substrate material seems to be the one that promotes a stronger adhesion and the development of the most stable biofilm for use as a biomass carrier in denitrifying inverse fluidized bed reactors. This was confirmed by the results of adhesion tests. In this way, adhesion seems to be dominated by hydrophobic interactions.     

氯化聚丙烯多元共聚物的制备及粘结作用

采用溶液法以多元单体接枝共聚氯化聚丙烯（CPP）,制得氯化聚丙烯的多元共聚物。在不同的施工条件下,研究讨论了该多元共聚物对不锈钢（SUS）／聚丙烯（PP）复合结构材料的粘结作用。结果表明：该多元共聚物对SUS／PP复合结构材料具有良好的粘结作用,其最大剥离强度可达11．98N／mm;该多元共聚物对SUS／PP的粘结作用具有良好的耐候性及耐水性,经冷热循环试验及50℃水浸泡60h,未见粘结强度明显下降。     

Evaluation of pressure-sensitive tape adhesion and backing directionality by excimer laser methods

The effects of 248 nm KrF excimer laser irradiation on a pressure-sensitive adhesive tape bonded to a glass substrate were investigated as a possible method to evaluate the quality of adhesion, as well as the directionality induced during manufacture. The model pressure-sensitive tape consisted of biaxially-oriented polypropylene (PP) tape coated with a hot-melt rubber resin. Analysis of the front-shot experiments, which were performed by irradiation through the PP backing, allowed correlation between the excimer laser irradiation-induced detachment and the peel adhesion strength. For this purpose, peel tests were performed before and after laser shots. The directionality induced during manufacture resulted in a more ablated area in the strength direction than in the transverse direction when the bonded tapes were irradiated with an elliptically-shaped laser beam above the ablation threshold. A correlation was found between the detachment bubbles created by irradiation below the ablation threshold and their respective peel adhesion values, which allows us to evaluate the quality of adhesion for pressure-sensitive tapes. Thus, a method to evaluate the quality of adhesion using an excimer laser is proposed based on the findings of this work.     

Phenol‐modified polypropylenes as adhesion promoters in glass fiber–reinforced polypropylene composites

This publication is based on research work done on functional phenol‐modified polypropylenes (PPs) as adhesion promoters in glass fiber–reinforced PP composites. The glass fiber roving was first impregnated with different combinations of functional polymers and polypropylene in a melt impregnation die attached to an extruder to obtain prepreg. The prepreg was then tested in many ways both macro‐ and micromechanically. The tests included notched tensile tests, optical and electron microscopy, and DMTA (dynamic mechanical thermal analyzer) and DSC (differential scanning calorimetry) analyses as well as determination of the glass content. The tests were run on prepregs containing pure PP, PP with a commercial adhesion promoter, and PP with a number of functional, mostly phenol‐based, polymers. Also, single‐fiber tests were performed on individual glass fibers to test the level of adhesion with the above‐mentioned material combinations. With these tests it could be seen that some of the phenol‐based functional polymers provided the prepreg with better adhesion between the fibers and the matrix than did the commercial adhesion promoter. Optical and electron microscopy also were used in determining the level of adhesion as well as the deformation and fracture mechanisms of the prepreg. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 1203–1213, 2002; DOI 10.1002/app.10441     

细旦丙纶专用聚丙烯生产工艺的优化

通过对国内目前所需细旦丙纶原料(聚丙烯)的质量指标进行调研,制定出相应的质量指标体系。分析对比了化学降解法和氢调法生产细旦丙纶原料的优缺点,介绍了氢调法生产的工艺流程。通过对生产中的各种工艺参数进行控制和调优,开发并优化了生产细旦丙纶原料的工艺条件。实践证明:通过控制好聚合加氢量、聚合反应的工艺条件,加强丙烯精制,提高主催化剂活性,控制助催化剂的加入量,就可生产出质量可靠、纺丝性能优良的细旦丙纶专用料。     

Improved melting strength of polypropylene by reactive compounding with ultrafine full‐vulcanized polybutadiene rubber (UFBR) particles

Ultrafine full‐vulcanized polybutadiene rubber (UFBR) in particle sizes of ca. 50–100 nm has been used for modifying mechanical and processing performances of polypropylene (PP), and PP‐g‐maleic anhydride (PP‐MA) has been used as a compatibilizer for enhancing the interfacial adhesion between the two components. The results show that PP/UFBR possesses rheological behaviors such as highly branched PP when UFBR content in blends reaches 10 wt%, while in contrast, the much low content of UFBR combining small amount of PP‐MA endows the material with rheological characteristics of high melt strength materials like highly branched PP. The mechanism accounting for the rheological behaviors of binary blends and effectiveness of PP‐MA on PP/UFBR blends has been proposed. POLYM. ENG. SCI., 2009. © 2009 Society of Plastics Engineers     

小本体聚丙烯粉料改性成纺粘非织造布专用料的制法

采用添加分子量调节剂的方法控制聚丙烯流变性,将小本体聚丙烯粉料改性成纺粘非织造布专用料。分别对原料和助剂进行了筛选,经过小试及工业化生产,取得满意结果。     

Unidirectional hemp and flax EP‐ and PP‐composites: Influence of defined fiber treatments

In some technical areas, mainly in the automotive industry, glass fiber reinforced polymers are intended to be replaced by natural fiber reinforced polymer systems. Therefore, higher requirements will be imposed to the physical fiber properties, fiber‐matrix adhesion, and the quality assurance. To improve the properties of epoxy resins (EP) and polypropylene (PP) composites, flax and hemp fibers were modified by mercerization and MAH‐PP coupling agent was used for preparing the PP composites. The effects of different mercerization parameters such as concentration of alkali (NaOH), temperature, and duration time along with tensile stress applied to the fibers on the structure and properties of hemp fibers were studied and judged via the cellulose I–II lattice conversion. It was observed that the mechanical properties of the fibers can be controlled in a broad range by using appropriate mercerization parameters. Unidirectional EP composites were manufactured by the filament winding technique; at the PP matrix material, a combination with a film‐stacking technique was used. The influence of mercerization parameters on the properties of EP composites was studied with hemp yarn as an example. Different macromechanical effects are shown at hemp‐ and flax‐PP model composites with mercerized, MAH‐PP‐treated, or MAH‐PP‐treated mercerized yarns. The composites' properties were verified by tensile and flexural tests. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 2150–2156, 2004     

杂环硅烷自组装膜改性的聚丙烯表面镀铜研究

通过在电晕放电处理的聚丙烯(PP)表面自组装6-(3-三乙氧基硅基丙基氨)-1,3,5-三嗪-2,4-二硫醇单钠盐(TES)纳米膜后,进行了化学镀铜研究。考察了施镀温度、镀液pH值对镀速的影响,施镀时间对镀层厚度的影响,确定了最优工艺参数。在优化的工艺条件下制备镀层,用扫描电镜对镀层的形貌进行分析,并做了粘接性能测试。结果表明:最佳工艺为施镀温度为50℃,pH为13,施镀时间为50 min。采用此优化工艺条件制备的镀层,表观光亮,均匀致密,与基体结合力良好。