三元共聚聚丙烯的开发及发展前景

介绍了三元共聚聚丙烯的性能和应用领域,展望了三元共聚聚丙烯的发展前景.根据市场调研的结果,列举了部分三元共聚产品牌号,分析了国内企业没有生产三元共聚产品的主要原因,针对三元共聚聚丙烯的市场现状,建议国内聚丙烯生产企业加快开发步伐.     

独山子聚丙烯新产品试产成功

正据报道,以三元共聚聚丙烯产品列为新产品开发重点项目独山子石化公司聚丙烯新产品TF1005和TF1007于近日试产成功。为加快新产品的开发和产业化,优化产品结构,提高经济效益和市场竞争力,独山子石化公司将三元共聚聚丙烯产品列为新产品开发重点项目,2015年大修在新区聚丙烯装置实施丁烯-1加注系统改造,装置具备生产三元共聚聚丙烯产品的条     

兰州石化推出三元共聚聚丙烯

正日前,兰州石化乙烯厂聚丙烯装置顺利完成三元共聚产品EPB08F的生产任务,共生产聚丙烯树脂2137t。该产品属于集团公司聚烯烃重大科技专项主要牌号之一,经检测产品各项性能指标均达到行业标准。三元无规共聚聚丙烯产品是聚丙烯高端产品之一,国内市场此类产品绝大部分依赖进口,处于供不应求的状态。EPB08F牌号产品是一种三元共聚聚丙烯树脂,由丙烯、乙烯、丁烯三种烯     

独山子石化公司聚丙烯新产品试产成功

正以三元共聚聚丙烯产品列为新产品开发重点项目的独山子石化公司聚丙烯新产品TF1005和TF1007试产成功。为加快新产品的开发和产业化,优化产品结构,提高经济效益和市场竞争力,独山子石化公司将三元共聚聚丙烯产品列为新产品开发重点项目,2015年大修在新区的聚丙烯装置,实施丁烯-1加注系统改造,装置具备生产三元共聚聚丙     

塑料市场

正独山子聚丙烯新产品试产成功据报道,以三元共聚聚丙烯产品列为新产品开发重点项目独山子石化公司聚丙烯新产品TF1005和TF1007试产成功。为加快新产品的开发和产业化,优化产品结构,提高经济效益和市场竞争力,独山子石化公司将三元共聚聚丙烯产品列为新产品开发重点项目,2015年大修在新区聚丙烯装置实施丁烯-1加注系统改造,装置具备生产三元共聚聚丙     

兰州石化生产出三元无规共聚聚丙烯

正新近,兰州石化乙烯厂聚丙烯装置生产出三元共聚产品EPB08F。该产品是一种三元共聚聚丙烯树脂,由丙烯、乙烯、丁烯三种烯烃单体,在反应器内经过一次共聚而生产的无规共聚聚丙烯产品。通过改变分子链的有序性和结晶性,特殊的分子链结构赋予了其较低的热封温度,产品广泛应用于热密封、电容器薄膜、金属复合膜、食品包装膜等行业,具有较高的经济附加值。     

燕山石化公司两课题通过中石化鉴定

2011年3月,中国石油化工股份有限公司(简称中石化)北京燕山分公司(简称燕山石化公司)的三元共聚聚丙烯成套技术开发、氢调法高流动聚丙烯成套技术开发两课题通过中石化的鉴定。三元共聚聚丙烯成套技术开发课题组在对产品市场调研的基础上,制定了三元共聚聚丙烯     

可控流变技术在Hypol聚丙烯工艺上的应用

介绍了降解剂的作用原理、广州石化两套聚丙烯装置根据Hypol工艺特点和两套装置全面开发生产的均聚、抗冲共聚、无规共聚可控流变聚丙烯（CRPP）系列产品。采用可控流变技术制成的聚丙烯产品流动性好,适合注塑成型和纤维生产,还可提高抗冲共聚产品的抗冲击性能和生产负荷。最后提出了CRPP产品会造成刚性下降及带来气味等。     

长岭炼化丙丁共聚装置建成投产

正2018年10月15日,长岭炼化丙丁共聚装置顺利投产,生产出PPR-MT20-S、PPR-M17等聚丙烯共聚产品。丙丁共聚装置从3月开始施工,历经几个月攻坚克难,生产出了加工流动性和光学性能好的聚丙烯共聚产品,实现由原来的单一均聚产品到共聚产品的重要突破。丙丁共聚产品     

国内煤制聚丙烯市场现状及应用研究

文章详细论述了国内煤（甲醇）制聚丙烯生产现状及未来几年国内煤（甲醇）制聚丙烯装置扩能情况.同时,文章在概述国内现有煤制聚丙烯装置生产牌号的基础上,重点分析了神华宁夏煤业集团生产的低融指均聚聚丙烯、低融指抗冲共聚聚丙烯、中融指均聚聚丙烯产品的市场应用情况及产品特点并对神华宁煤集团煤基聚丙烯产品未来发展趋势进行了展望.     

Reactions of cyclohexane in a microwave discharge reactor

A study has been made of the reactions of cyclohexane in a continuous-flow microwave discharge reactor. Butene-1 and propylene were the major reaction products; ethylene and hydrogen were produced in smaller amounts. The distribution of reaction products was found to depend on the reactor pressure and flow-rate. The results show that the fragmentation of cyclohexane is not the sole source of butene-1. The insertion of nickel wire into the reactor enhanced the production of ethylene and propylene; yields of butene-1 were diminished. In the presence of nickel the production of ethylene and propylene became independent of pressure. When carbon dioxide was added to the cyclohexane feed the major reaction product was acetylene. The carbon dioxide did not react chemically. The yields of acetylene per unit energy input were found to be fairly high.     

乙烯-丙烯-1-丁烯三元共聚合

采用自制的ziegler-Natta催化剂催化乙烯-丙烯-1-丁烯三元共聚合.考察了1-丁烯/丙烯、铝钛比、反应温度和压力等对三元共聚合的影响.结果表明.三元共聚物中支化度约为26门000 C,其中乙基支链为18/1 000 C、丙基支链为8/1 000 C.在聚合温度为60℃、压力为0.8 MPa、乙烯分压百分数为70%、1-丁烯分压百分数为5.7%和丙烯分压百分数为24.3%时,催化活性最高,为10.5 kg/g.当n(Al)/n(Ti)大于100时,催化活性增加趋势变缓.聚合压力超过0.8 MPa时,催化活性变化不大.聚合平行实验结果表明,上述条件稳定,所得三元共聚物的表观密度为0.32g/cm3,拉伸强度为11～12 MPa、断裂伸长率为540%～560%.     

Thermal and X-ray investigations of ethylene–α-olefin copolymers obtained with highly active supported Ti–Mg and V–Mg catalysts

Copolymers of ethylene with propylene, butene-1 and hexene-1 were prepared using a titanium–magnesium (TMC) or a vanadium–magnesium catalyst (VMC). The copolymers were examined for thermal stability by TGA, melting and crystallization behaviour by DSC and crystallinity by XRD. Fractionated samples of ethylene–hexene-1 copolymers were also similarly characterized. Results indicate that VMC produces copolymers with a higher degree of crystallinity and greater compositional homogeneity than TMC.     

丙烯/1-丁烯无规共聚物与丙烯/乙烯抗冲共聚物的对比研究

对丙烯/1-丁烯无规共聚物(PPB)与丙烯/乙烯抗冲共聚物(PPE)的结晶行为进行对比,在等温结晶时,通过相对结晶度随时间的变化关系、等温结晶曲线等研究,表明丙烯/1-丁烯无规共聚物结晶速率明显低于丙烯/乙烯抗冲共聚物,同时丙烯/乙烯抗冲共聚物的等温结晶速率随乙烯单元含量增加没有明显降低。根据Avrami方程计算了共聚物的结晶活化能,证明丙烯/1-丁烯无规共聚物的结晶能力较丙烯/乙烯抗冲共聚物低。扫描电镜分析丙烯/1-丁烯无规共聚物在丁烯单元摩尔分数2.39%时没有韧性拉伸,而丙烯/乙烯抗冲共聚物在乙烯单元摩尔分数3%时出现韧性拉伸。     

Alternating copolymerization of carbon monoxide and α-olefins

Summary Pd⁺⁺ catalysts with bis(diphenylphosphino)alkane ligand and methanol as coinitiator were found to be very active for the alternating copolymerization of carbon monoxide with propylene, butene-1 and hexene-1. The catalysts with bis(diphenylphosphino) propane and butane have the highest polymerization activities but only modest regiospecificity. The chiral (-)-2, 3-0-isopropylidene-2,3-dihydroxy-1,4-bis(diphenylphosphino)butane-Pd catalyst has good activity as well as regioselectivity to produce semi-crystalline CO/propylene alternating copolymer.     

Telomeric plasticizers: Cotelomers based on vinylchloride and carbontetrachloride

Cotelomers of vinylchloride and other monomers (acrylate esters, diethyl maleate, diethyl fumarate, ethylene, propylene, and butene-1) have been prepared in order to evaluate their properties as plasticizers for poly(vinyl chloride). With the electron-acceptor ester-monomers, cotelomers with carbon tetrachloride of an average molecular weight of 500–900 were obtained, using iron chloride as the catalyst. Ethylene, propylene, and butene-1 gave lower molecular weights and a considerable amount of distillable telomers. Ethylene, vinyl chloride, and carbon tetrachloride gave cotelomers with a molecular weight in the range 400–750, when the telomerization was initiated by ethanolamine or by azobisisobutyronitrile. These initiation systems gave a much reduced volatile fraction.     

Effect of thermal treatment on solution grown crystals of isotactic propylene/butene-1 copolymers

The annealing behaviour of solution grown crystals of isotactic propylene butene-1 copolymers is studied in detail. Modifications in both position and number of the d.s.c. peaks in the thermograms of single crystal aggregates as a function of the annealing temperature, are observed and correlated with the presence of different crystalline phases. For all samples a maximum is observed when the overall apparent enthalpy of fusion is reported against the annealing temperature. The annealing temperature corresponding to the maximum is a function of the copolymer composition. The diagram is characterized by a minimum corresponding to a percentage of about 43% by wt in butene-1. The long spacing of crystal aggregates is a function of the annealing temperature. For some samples the long spacing has been correlated with the melting temperature of the crystalline phases and the equilibrium melting point calculated. For copolymer samples at high propylene content the examination of the wide-angle X-ray diffraction patterns leads to the conclusion that a certain number of butene-1 units, incorporated during the crystallization, as defects in the crystalline lattice of polypropylene, following the annealing process, are ejected in the amorphous phase.     

影响超净电缆料用LDPE性能的因素分析

用乙烯为反应单体、过氧化物为引发剂、丙烯(或丙醛、乙烷、丁烯-1)为调节剂制备超净电缆料用低密度聚乙烯(LDPE),对生产过程中影响LDPE的介电性能、加工流变性能以及降低杂质含量等因素进行了分析,提出了改进措施,满足超净电缆料用LDPE的要求.     

Influence of copolymerization conditions on the structure and properties of polyethylene/polypropylene/poly(ethylene‐co‐propylene) in‐reactor alloys synthesized in gas‐phase with spherical ziegler‐natta catalyst

A spherical TiCl₄/MgCl₂‐based catalyst was used in the synthesis of polyethylene/polypropylene/poly (ethylene‐co‐propylene) in‐reactor alloys by sequential homopolymerization of ethylene, homopolymerization of propylene, and copolymerization of ethylene and propylene in gas‐phase. Different conditions in the third stage, such as the pressure of ethylene–propylene mixture and the feed ratio of ethylene, were investigated, and their influences on the compositions, structural distribution and properties of the in‐reactor alloys were studied. Increasing the feed ratio of ethylene is favorable for forming random ethylene–propylene copolymer and segmented ethylene–propylene copolymer, however, slightly influences the formation of ethylene‐b‐propylene block copolymer and homopolyethylene. Raising the pressure of ethylene–propylene mixture results in the increment of segmented ethylene–propylene copolymer, ethylene‐b‐propylene block copolymer, and PE fractions, but exerts a slight influence on both the random copolymer and PP fractions. The impact strength of PE/PP/EPR in‐reactor alloys can be markedly improved by increasing the feed ratio of ethylene in the ethylene–propylene mixture or increasing the pressure of ethylene–propylene mixture. However, the flexural modulus decreases as the feed ratio of ethylene in the ethylene–propylene mixture or the pressure of ethylene–propylene mixture increases. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 2481–2487, 2006     

Influence of the longest ethylene and isotactic propylene sequences on crystallization elution fractionation of ethylene/propylene copolymers

Crystallization elution fractionation (CEF) is the newest crystallization-based technique for estimating the chemical composition distribution of ethylene/1-olefin copolymers. Understanding the separation mechanism of CEF for ethylene/propylene copolymers over their full compositional range is challenging because the crystallizabilities of the copolymer chains depend on the longest ethylene sequence and on longest isotactic propylene sequence. We developed a mathematical model to describe the CEF mechanism for ethylene/propylene copolymers over the entire compositional range using population balances for the crystallization and dissolution stages. The joint distribution of longest ethylene and isotactic propylene sequences determines how the copolymer populations crystallize and dissolve. The model was validated with experimental CEF profiles of ethylene/propylene copolymers varying from pure ethylene to propylene homopolymers.