VK管泡罩塔排水的回收利用

ＶＫ管泡罩塔排水的回收利用李凤春，王旭东，李红尽，丁敏（扬州有机化工厂锦纶二分厂，２２５００３）扬州有机化工厂锦纶二分厂自１９９２年开车以来，由于φ８００ｍｉｎ聚合管泡罩塔设计问题（因楼层限制，泡罩塔容积较小），泡罩排水含单体浓度一直较高（含单３５％...     

提高聚氯乙烯树脂白度的调研报告及有效措施

通过对我国目前ＰＶＣ生产中提高了ＰＶＣ树脂热稳定性（白度）所采用的各种方法，从反应机理上进行了分析，指出了各种添加助剂的不足之处，并提出了有效措施。聚合后加入抗热阻聚液（ＫＺ），可使树脂白度提高１０￣２０％。并可相应提高汽提温度和时间，降低ＶＣＭ残留量。     

萃取水中己内酰胺单体回收工艺的调整与探析

萃取水中己内酰胺单体回收工艺的调整与探析张胜一（山东青岛中达化纤有限公司，２６６５５５）１单体回收方法简述在ＰＡ６切片生产过程中，由于己内酰胺开环聚合是一个可逆平衡反应，因此ＶＫ管反应最终聚合物仍含有７％～８％的单体和１．５％左右的低聚物。这些物质的...     

提高蒸馏残渣中己内酰胺的回收率

提高蒸馏残渣中己内酰胺的回收率毛新华，李卓志（新会美达锦纶股份有限公司，广东，５２９１００）１单体回收几种方法在ＰＡ６切片生产过程中，由于己内酰胺的开环聚合是一个复杂的可逆过程，使ＶＫ管反应平衡后的熔体中含有一定量的单体（７％～８％）和低聚物（１．５...     

国产牵伸机性能比较

介绍了ＶＣ４４３Ａ型，ＫＪＫＶ５１８－ＳＭ型，ＣＤＷ１３６型３种国产牵伸机的生产工艺及特点，并对它们的加工性能、产品质量进行了分析比较，由于ＣＤＷ１３６型机性能较好，建议以该机为基础进一步进行改进，以提高牵伸机的产品开发能力。     

PA6减压后聚合生产工艺

分析探讨了采用减压后聚合工艺生产ＰＡ６ 的可行性及实施效果。ＰＡ６ 生产中实施减压后聚合工艺能够提高反应后期的排水率、降低中心熔体温度、降低产物的低聚物含量、提高ＶＫ 管生产能力及切片的内在质量。还讨论了真空度的大小对ＰＡ６ 生产的影响。生产中真空度取－ ０．００５～－ ０．０３ Ｍ Ｐａ较为适宜。     

μXL在PVC糊树脂工程中的应用

彬州电化厂１０Ｋｔ／ａＰＶＣ糊树的聚合工程，采用μＸＬ系统作为主控系统，重要工位以ＹＳ－８０仪表作为下位。控制系统主要包括；化学品配置及加料系统，聚合控制系统、回收系统、干燥包装系统。本对化学品配置及加料系统，聚合控制系统的控制方案为主要对象进行论述。     

PA6聚合生产技术

综述了国外ＰＡ６聚合生产工艺与设备，介绍了几种常用的聚合方法及特点，并进行了对比。德国Ｚｉｍｍｅｒ公司、ＫａｒｌＦｉｓｃｈｅｒ公司；瑞士Ｉｎｖｅｎｔａ公司；意大利ＮＯＹ公司等的工艺技术设计合理，所生产的产品质量较好，分子量分布均匀。其设备特点是在聚合管内广泛采用静态混合器或整流器，萃取塔采用狭缝式结构，干燥塔内采用热氮气干燥，聚合过程采用ＤＣＳ集散系统控制，生产过程全部连续化。建议各地在引进新装置时，应围绕技术经济性、产品用途作全面评价，根据具体情况，选择最佳方案。     

抗热阻聚（KZ）液在PVC生产中的应用

在ＶＣ聚合中采用抗热阻聚（ＫＺ）液，取代有机锡和Ｃ７－９酸锌，不但降低生产成本，使ＰＶＣ树脂的热老化白度合格率由原来的５％提高到９０．６％，且对树脂的其它质量性能无不良影响。     

挂衣巾和RPVC椭圆管生产技术

利用ＫＭＤ－６ＫＫ锥形双螺杆挤出机和ＲＰＶＣ管材挤出口芯模生产ＲＰＶＣ椭圆管时,必须在定径套与口芯模之间套接一个至关重要的过渡装置,否则难以挤出成型。本文主要介绍该过渡装置及定径套的设计、ＲＰＶＣ椭圆管的配方选择及成型工艺控制。     

国内外直型 VK 管的差距

对国内外一部分尼龙6厂家使用的直型 VK 管进行了实地考察和对比,认为国产直型 VK 管处于落后状态:设备结构过于简单,生产能力小,所生产的产品质量较差。爱姆斯—伊文达公司设计的直型 VK 管比较先进,设计合理,在技术上处于领先地位。针对国产直型 VK 管存在的缺陷,建议有关研究设计院研制具有中国特色的直型 VK 管,以利于发展我国的尼龙生产。     

Polyamide-6 polymerization and its melt flow in the VK tube reactor with optimized baffle structure

The flow mechanism of Polyamide-6 (PA6) melt over conical perforated baffles in the VK tube is elucidated by computerized analysis based on a rational assumption of Stokes' flow. The governing equations for a two-dimensional flow are solved by the finite difference method to generate the stream function profile, velocity field and residence time distribution. Optimization of the geometries of the baffle structure brings about a uniform residence time distribution, so as to ensure a homogeneous extent of reaction for the final product. The complete mathematical model for PA6 polymerization while flowing through the VK tube was established according to PA6 hydrolytic polymerization kinetics. The optimized baffle structure was shown to be compatible with the desired polymerization variables.     

PA6水解聚合反应数学模型及其实验验证

建立了PA6熔体在VK管中边流动边聚合的聚合反应数学模型,采用流态显示技术和文献报道的测定数据验证了数学模型的可靠性,还研究了熔体在具有优化科挡板内部结构的VK管中流过10块交替排列的挡板过程中停留时间分布、单体的转化率、产物的聚合度的变化规律,并从聚合指标反证了挡板结构的合理性。     

优质28dtex/24f涤纶超细型高弹力丝的生产工艺

在涤纶POY-DTY设备上,为了得到替代尼龙高弹丝的涤纶超细型POY束丝,从卷绕速度(纺丝速度)、固化成形、喷丝孔的直径与长径比、组件内部压力、熔体温度等进行工艺条件的试验与分析;在停止使用定型热箱的前提条件下,从DTY机的加工速度、拉伸变形温度、全陶瓷假捻器摩擦因数、组合方式、间距和喂丝角度等进行工艺条件的试验与分析,开发与生产了优质的28dtex/24f涤纶超细型高弹力丝。     

Nanocomposite matrix for increased fibre composite strength

A new type of three-phase thermoplastic composite has been made, consisting of a main reinforcing phase of woven glass or carbon fibres and a PA6 nanocomposite matrix. Nanocomposites have the potential to improve the matrix dominated flexural and compressive strength by increasing the matrix modulus. Good quality fibre composites have been made with several types of PA6 nanocomposite and unfilled PA6 in combination with glass and carbon fibre reinforcement. Flexural tests on commercial PA6 fibre composites have shown the decrease of the flexural strength upon increasing temperature and this has been compared with the decrease of the matrix modulus. The nanocomposites used in this research have moduli that are much higher than unfilled PA6, also above T_g and in moisture conditioned samples. The strength of glass fibre composites can be increased by more than 40% at elevated temperatures and the temperature range at which a certain minimum strength is present can be increased by 40-50 °C. Carbon fibre composites also show significant improvements at elevated temperatures, although not at room temperature. The advantage of the use of nanocomposites instead of other polymers to improve the fibre composite properties is that the properties can be improved without any change in the processing conditions.     

PA6／POE超韧合金的形态和性能

介绍了尼龙６（ＰＡ６）和乙烯－辛烯共聚物热塑性体（ＰＯＥ）共混制得的ＰＡ６／ＰＯＥ超韧合 形态和性能,并与国外某些超韧ＰＡ６产品性能进行了比较。     

Microstructures and mechanical properties of polypropylene/polyamide 6/polyethelene-octene elastomer blends

A series of polymer blends were designed and manufactured. They are composed of three phases: polypropylene (PP), polyamide-6 (PA6) and polyethylene-octene elastomer (POE) grafted with maleic anhydride. The weight fraction of PA6 was adjusted from 0 to 40% by increments of 10%, and the weight fraction of POE was systematically half that of PA6. The morphology, essentially made of PA6 particles dispersed in the PP matrix, was characterised by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). In the extruded plates prepared with the blends, the shape of the dispersed PA6 particles showed an elongated ellipsoidal shape, whose aspect ratio increased somehow with alloying content. The POE modifier was observed both as a thin interlayer (less than 100 nm thickness) at the PP/PA6 interface, and as a few isolated particles. The elastic modulus and yield stress in tension are nearly constant for PP and blends. By contrast, the notched Izod impact strength increases very much with alloying content. This remarkable effect is interpreted in terms of POE interphase cavitation, enhanced plastic shear deformation and resistance of PA6 particles to crack propagation.     

Correlation of morphology,rheology, and performance improvement in gasoline tubes based on PA‐6 nanocomposites

PA‐6/organo‐modified layered silicate nanocompounds were prepared by the melt mixing of PA‐6 with different nanoclay loadings in a corotating twin‐screw extruder. Gasoline tubes based on these nanocompounds were produced at different silicate loadings. Thermal, mechanical, rheological, and barrier properties of the different samples were investigated and correlated to their morphology. Transmission electron microscopy, wide angle X‐ray scattering, and linear melt state viscoelastic measurements were used to characterize the different aspects of nanoclay dispersion in the nanocomposite samples. While tensile modulus, softening point, heat distortion temperature, and gasoline barrier properties of the prepared tubes were improved considerably by increasing the clay content, performance improvement with respect to clay content (after a certain value) decreased with increasing clay loading. It could be attributed to the re‐agglomeration of tactoids at higher concentrations. These findings were correlated with the rheological and morphological observations. J. VINYL ADDIT. TECHNOL., 2010. © 2010 Society of Plastics Engineers     

零触发调功控制在VK管加热控制中的应用

本文针对国内目前VK管采用的二位或调节温控方式进行了分析,指出其温控方面的不足之处,为了进一步提高产品质量把二位式调节温控方式改进为零触发调功控制。通过一年多的实践证明,改进后的VK管各段温度传热均匀,温控精度高,对提高VK管生产的产品质量起到了很大的作用。