铸片及纵向拉伸工艺对PET薄膜透明度的影响

分析了铸片工艺及纵向拉伸工艺对PET薄膜透明度的影响。通过实验可知PET薄膜的透明度随着急冷辊温度的升高逐渐降低,铸片温度在20℃时所生产的薄膜透明度最高(99.5%),当急冷辊的温度低于20℃或高于40℃时都会造成不正常生产。拉伸温度对PET薄膜透明度影响不大,但拉伸比越大,冷却温度越低,其产品的透明度越高。     

UHMWPE/矿物油体系热致相分离过程的研究

采用POM观察超高摩尔质量聚乙烯(UHMWPE)/矿物油体系的热致相分离过程,结合SEM观察流延铸片断面的形貌结构,构建了UHMWPE/矿物油体系的蜂窝状结构模型.研究了不同冷却速率影响相分离程度而得到的流延铸片的结构形态,对比了不同冷却条件下流延铸片经过双向拉伸之后的薄膜的微观结构.     

塑料挤出拉伸薄膜铸片系统温控风刀装置的研究设计

塑料挤出拉伸薄膜铸片过程中,温控风刀装置的运用,在保证传统正压风刀原有功能作用的基础上,可更加有效的控制辅助附片过程膜片的冷却速度及温度,根据铸片成型及后续拉伸工艺,更加有效控制铸片结晶度、晶粒结构及分布、晶粒尺寸等性能参数,为后续挤出拉伸薄膜性能的提升研究创造了有利条件。     

双向拉伸聚酯薄膜铸膜工艺研究

提出双向拉伸聚酯薄膜铸膜过程的模头拉伸比计算方法;研究了模头拉伸比与模唇开度和铸膜厚片的关系,模唇开度的确定程序,铸膜厚片颈缩的影响因素,薄膜边膜厚度梯度要求及控制措施;探讨了熔体膜厚度方向在冷鼓上的冷却固化温度分布、静电附片方式以及制约铸膜速度的因素。     

吹塑工艺对双峰HDPE薄膜落镖冲击性能的影响

通过对相对分子质量分布曲线呈双峰(简称双峰)的薄膜专用高密度聚乙烯(HDPE)MH602进行吹塑薄膜,研究了熔体温度、吹胀比、冷却线高度、环境温度等工艺条件对薄膜落镖冲击破损质量的影响。用双峰HDPE MH602吹塑薄膜的最佳工艺条件为:熔体温度220℃,吹胀比4.0∶1.0,环境温度20~25℃;采用进口催化剂生产的MH602吹塑薄膜时,冷却线高度最佳为1 800 mm;采用国产催化剂生产的MH602吹塑薄膜时,冷却线高度最佳为1 200 mm。     

铸片系统对BOPP薄膜的影响研究

介绍了双向拉伸聚丙烯（BOPP）薄膜铸片系统的设备结构和工作原理，详细地论述了铸片系统中模头、气刀、压边嘴、激冷辊以及水槽对BOPP薄膜的生产过程和性能的影响，并提出了一些注意事项和解决方法，对生产实践有相当的参考价值。     

巴斯夫启动路港聚酰胺共挤生产线

2013年11月,巴斯夫在路德维希港生产基地启动了一条为包装和工业用薄膜量身定制的聚酰胺共挤生产线。该生产线将用于与薄膜行业合作伙伴共同开发的Ultramid聚酰月安产品的新应用,以及Ultramid薄膜产品的研发和材料测试。该生产线可生产多达7层的流延薄膜和吹塑薄膜,能以最快50m／min的速度挤出厚20～250um、幅750mm的对称或非对称结构薄膜。吹塑薄膜可风冷,或在必要时使用水冷;流延薄膜可在冷却辊上冷却,温度在20～130℃可调整。     

水溶性底胶在PVDC涂敷薄膜生产中的应用

介绍了水溶性底胶的定义、性能,采用水溶性底胶生产PVDC涂敷薄膜时烘干和冷却步骤的注意事项,国内外水溶性底胶性能现状;比较了采用水溶性底胶或溶剂性底胶生产的PVDC涂敷薄膜的性能;展望了水溶性底胶在PVDC涂敷薄膜生产中的应用前景。     

双向拉伸聚丙烯薄膜的生产工艺研究

介绍了双向拉伸聚丙烯(BOPP)薄膜的生产方法及工艺流程,分析了原材料、纵横拉伸比、温度等因素对BOPP薄膜物理、力学性能的影响,并且对生产中常见的问题进行了分析,提出了解决铸片常见缺陷及拉伸破膜的方法。     

风环初探

比较了不同结构风环的冷却效率和生产的薄膜质量,指出选用风环应综合考虑挤出机生产能力,风环的冷却效率和产品质量。     

Structure and Material Design of High Performance Functional Refractories for High-speed Continuous Casting

Functional refractories,including submerged entry nozzle ( SEN) ,ladle shroud and monolithic stopper, are the key refractories for continuous casting. Driven by the demand of high-speed continuous casting,traditional functional refractories fail to meet the needs of long span life,and high performance functional refractories for continuous casting are increasingly required. Through structure and material design,the performance of functional refractories is significantly improved. In this paper,some research advances on functional refractories for continuous casting were mentioned. Through numerical modeling and hot simulation,the service life of non-preheating ladle shroud was increased from 8 h to more than 12 h. Through the water modeling,the flow patterns in the mold were significantly improved and through hot simulation and material design,the service life and reliability of SEN were also significantly improved.     

A light-scattering and membrane formation study on concentrated cellulose acetate solutions

An improved explanation of the mechanism of the porous membrane formation with asymmetric structure has been proposed. It emerged from the correlation of the results obtained by the light-scattering measurements of the ternary membrane casting solutions and by the reverse osmosis and ultrafiltration testing of the asymmetric membranes prepared from these solutions. The results of anisotropic light-scattering measurements indicated the extent of supermolecular structurization of the casting solution which affected the porous structure formation in the membrane surface region. The variation of the casting solution composition and, particularly, the role of the CA/F ratio, the formamide content, and their influence on the asymmetric membrane properties were investigated and explained using the improved concept of the membrane-making mechanism.     

热处理条件对聚丙烯流延基膜取向片晶结构及拉伸成孔性的影响

摘要：为了优化挤出流延单向拉伸法制备聚丙烯微孔膜的工艺,以温度、时间和基膜受到的张应力做为热处理条件变量,通过DSC、FTIR、SEM、电子材料试验机和透气率测试仪等方法表征流延基膜的取向片晶结构参数和微孔膜的孔结构,考察热处理条件对聚丙烯流延基膜取向片晶结构和拉伸成孔性的影响。研究表明,随热处理温度从120℃提高到145℃,基膜的取向片晶结构得到改善,硬弹性增强,拉伸成孔性能变好;随热处理时间延长,基膜的结晶度、片晶厚度及取向程度不断提高,取向片晶结构趋于完善,当热处理时间达到30min后,取向片晶结构的完善程度接近稳定;在热处理过程中对基膜施加适当张应力可以提高基膜的片晶取向程度和硬弹性,改善其拉伸成孔性。     

A study on formation of regular honeycomb pattern in polysulfone film

Regular polysulfone (PSF) honeycomb film with micron-sized cells was prepared by casting the solution in an atmosphere with high humidity. Water droplets acted as the template around which the PSF in the solution assemble. In this paper, the effects of atmosphere humidity, solution concentration, and the PSF molecular weight on pore size were discussed; the influence of storage time of casting solution on the pattern regularity was presented; the mechanism of pattern formation was proposed.     

Morphology control of a poly(styrene-b-butadiene-b-4-vinylpyridine) ABC three-block polymer by binary solvent casting

Casting of a poly(styrene-b-butadiene-b-4-vinylpyridine) ABC three-block polymer from binary solvent systems was carried out to control the microphase-separated structure. Various morphologies including a ball-in-a-box structure and a lamellar structure were observed. On the basis of the change in solvent composition during the casting process, we deduced that the former structure was formed where the selective solvent for poly(4-vinylpyridine) in the binary mixture was lost by vaporization in an early stage of casting. On the contrary, the latter structure was formed under a casting condition when solvents were equally distributed into the three phases and/or the distribution and the composition of solvents had not varied significantly during the casting process. If casting proceeds from an opaque solution in which some aggregates already exist, or if the selective solvent for one or two of the three block segments vaporizes faster than other solvent in an early stage of casting, the morphology becomes a random and indefinite structure.     

基于TRIZ的真空注型机改进设计

应用发明问题解决理论(TRIZ理论)的物质-场模型及冲突矩阵方法,分析制模硅胶脱气和树脂真空注型工艺过程,提出真空注型机关键工艺功能改进设计方案;开发了硅胶脱气自动除泡装置和真空注型多工位浇注系统。样机验证结果表明,改进设计的真空注型机功能设计合理有效,劳动强度明显降低,工作效率显著提高。     

含硅聚氨酯弹性体的合成初探

从酸化的水玻璃中提取活性硅醇 ,然后与聚醚二醇混合 ,再与异氰酸酯反应 ,制得含硅的聚氨酯弹性体。并用固体核磁共振仪和热重分析仪对硅醇与多元醇的混合物的结构进行了分析。结果表明 :当硅醇添加量在一定范围内 ,弹性体的力学性能有所提高 ;在多元醇和硅醇之间没有产生明显的化学结合     

北16井区改善注水开发效果研究

针对北16井区构造复杂,储层非均质性强的特点。在油藏注水开发中,部分水井欠注,注采压差大,渗流阻力大等问题。采取了高压注水,分注,调剖等措施,以调整注采结构,完善注采系统。该措施实施后有效控制了含水上升速度,提高了注水波及系数,使得该区块注水开发效果得到改善。     

淀粉基全生物降解膜的制备工艺研究

通过流延法制备了一系列的淀粉基全生物降解膜。膜的物理性能研究表明,制备膜的最佳料液浓度为8%,膜的物理性能随着搅拌速度和搅拌时间的增加而增强;红外光谱表征和力学性能测试表明,随着干燥温度的升高,膜的结晶结构和拉伸强度增加,但是断裂伸长率显著下降。     

提高震动器铸件质量的全立式压铸工艺研究

基于震动器铸件的产品质量问题,分析了铸件的特点,针对震动器铸件在试生产中出现的缩松、缩孔及裂纹等缺陷,改进了压铸模设计,采取了增设补缩通道,优化镶嵌件预热温度,调整压射参数,延长保压时间等措施,运用磁铁的吸力解决了镶嵌件的悬挂问题。结果表明,该工艺措施有益于产品质量的提高,铸件的合格率可以达到90%。