丙纶纺粘非织布的喷气拉伸法生产技术

<正> 一 前 言 纺粘非织布的生产是一项世界新兴的工业技术,它是以聚丙烯切片或其他热塑性高聚物切片为原料,经熔融、纺丝、拉伸、铺网和热压等连续一步法纺丝成布。本厂引进西德莱芬豪斯(Reifenhauser)公司,1985年设计的最新工艺和设备,采用喷气拉伸法生产丙纶纺粘非织布,填补了我国纺粘非织布生产技术的空白。该技术与其他种类的非织布生产工艺相比,具有工艺流程短、设备紧凑、生产连续自控、生产成本低及其效率高等先进性,介绍如下。     

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。     

中厚型PET纺粘非织造布的工艺探讨

根据中厚型PET纺粘法非织造布的结构特点,对其生产工艺过程进行系统的分析研究,特别是对切片干燥、纺丝组件、拉伸气流、成网和热轧工艺等方面进行了探讨,取得了良好的纺丝效果和优良产品。     

中空桔瓣型双组分纺粘复合纤维原料流变性能研究

对中空桔瓣型双组分纺粘复合纤维的生产原料进行了流变性能研究,研究表明:PET切片熔体对温度变化较为敏感,PA6则反之;日本三菱PA6切片不适合于本文的温度差异法纺丝;290℃测试条件下PET切片熔体与280℃测试条件下浙江龙诚PA6切片熔体有着相似的流动性能,有利于双组分复合纺丝过程。     

丙纶纺粘法非织造布物理性能影响因素的探讨

分析了各种对丙纶纺粘非织造布物理性能的影响因素。结果表明，丙纶纺粘非织造布的单丝纤度、断裂强力、断裂伸长等物理指标随切片指标、纺丝温度、冷却条件、牵伸条件及热轧温度和压力的变化而变化；合理调节各因素的关系，可以得到品质良好的产品。     

提高涤纶纺粘非织造布均匀度的方法

针对涤纶纺粘非织造布生产过程中遇到的产品均匀度问题,从切片含水率、生产速度、侧吹风冷却、牵伸速率、丝束密度、成网工艺等方面进行初步的工艺探讨,并针对性地提出了相应的解决方案.     

辽化聚酯切片的可纺性研究

通过对辽化PET切片与国内外3种PET切片的分子量分布和常规指数的横向比较,阐明PET切片的分子量分布与PET纤维的抗张强度、拉伸倍数和熔体粘度之间的关系,并通过对辽化PET切片在辽化纤维三厂高速纺丝过程中反映出的问题进行了分析研究。     

10 g/m2超薄型涤纶纺粘非织造布生产工艺

从干切片含水率、纺丝温度、熔体过滤、牵伸工艺、生产速度、侧吹风冷却、成网排风吸附调整、热轧机温度、压力等工艺参数,探讨了在国产管式气流牵伸涤纶纺粘非织造布生产线上生产10 gm2超薄型涤纶纺粘非织造布过程中遇到的一系列问题,并针对性地提出相应的工艺调整措施,最终生产出合格的产品.     

高熔体指数PP专用料研制

简要介绍了以分子量较高的聚丙烯为基础树脂,采用化学降解一步法制得纤维级聚丙烯树脂的过程。该树脂等规指数高、分子量分布窄、熔体指数在20～80g/10min内可调,是高、中速纺丝及熔喷法、纺粘法无纺布的理想原料。     

控制聚酰胺6切片分子量的增值

切片分子量的增值对丝的质量影响很大。本文通过对原料ＣＰＬ、聚合、萃取、干燥等各个生产环节诸多因素的分析，得出了慎重选择原料，合理安排聚合反应温程、萃取设备进行技术改造，减少和杜绝复烘切片，是有效控制切片分子量增值的重要措施。     

超高相对分子质量PPTA树脂及其高模量芳纶的研究

对高相对分子质量聚对苯二甲酰对苯二胺(PPTA)树脂进行了表征,开展了添加超高相对分子质量PPTA树脂与普通相对分子质量PPTA树脂共混进行液晶纺丝得到高强度和高模量芳纶的结构表征与性能试验,同时对芳纶的力学性能与其PPTA树脂相对分子质量的关系进行了研究。结果表明,芳纶的力学性能与其PPTA聚合体的相对分子质量紧密相关,如果PPTA树脂的相对分子质量不够高,加上液晶纺丝和高模量热处理过程分子链的进一步降解,高模量芳纶的制备就无法实现。在系统研究PPTA聚合反应规律,特别是聚合诱导相互转变规律及其影响因素研究基础上,通过调控连续聚合的反应条件,在1 000 t/a连续聚合生产线上制备出比浓对数粘度高达9.2 dl/g的超高相对分子质量PPTA树脂;用超高相对分子质量PPTA树脂与通用级PPTA树脂(比浓对数粘度6.8 dl/g)混合进行纺丝,制备出高强度的芳纶,并进一步热处理得到高强度和高模量的芳纶。     

聚丙烯纺粘非织造布手感性能初探

随着非织造布生产技术的发展,研究测试和综合评价服用非织造布的手感性能显得日趋重要。借助传统织物的手感性能测试方法和仪器,可以对薄型聚丙烯纺粘非织造布的手感性能进行测试和评价。压缩性能、刚柔性能和折皱弹性等手感性能基本可以反映薄型纺粘织物的手感性能。测试结果表明,粘合区域的粘合性能是影响织物手感性能的决定性因素。     

二步法合成EP01441—310环氧树脂的研究

低分子量液态双酚Ａ型环氧树脂是一种热固性高分子材料，低分子量环氧树脂的生产工艺是通过分二次加碱进行开环反应，回收过量环氧氯丙烷后，再进行二次加碱后进行缩合反应来完成的。传统工艺中存在着产品的低质量，高消耗等缺点。     

高相对分子质量双峰HDPE及其应用

综述了高相对分子质量高密度聚乙烯树脂的性能、生产技术、应用领域及发展趋势．指出双峰聚乙烯中高相对分子质量段赋予良好的强度、低相对分子质量段使树脂具有良好的加工性．是日前用途广泛、市场极有前景的一种通用树脂。同时,介绍了台湾塑胶工业股份有限公司在薄膜级及管材级双峰聚乙烯、中空吹塑级宽峰聚乙烯产品上的生产工艺及生产现状。     

高挺度BOPP专用料F280M的生产开发

文章阐述了高挺度BOPP料F280M的开发和生产过程,并讨论该牌号重要的工艺参数和产品性能以及后加工情况。F280M产品物性主要通过聚合反应器中的分子量调节剂（H2）和给电子体的加入量（DONOR-D）进行控制,树脂的分子量、分予量分布和等规度分布决定产品的物理性能。加工应用表明：F280M具有高挺度,高模量,高透骥,好的成羰性,是较好的BOPP专用树脂。     

Correlation analysis of epoxy/amine resin cure,structure and chemorheological behavior in RTM processes

At the reactive mould‐filling stage in resin transfer moulding (RTM) processes, the correlation analysis of epoxy/amine resin cure, structure and chemorheological behavior plays a key role in the optimum control of RTM processes. A new methodology used to simulate the reactive resin flow in RTM processes with edge effect is presented in this article. The recursive approach and the branching theory are used to describe the evolution of molecular structure and resin viscosity, respectively. And then the resin flow process is simulated by means of a semi‐implicit iterative calculation method and the finite volume method. The results reveal the proposed resin cure‐structure‐viscosity model provides excellent agreement with the experimental viscosity data during the RTM filling process. It is also observed that the curing reaction causes the inhomogeneous distribution of resin conversion and resin molecular weight in the mould cavity, which will result in the spatially structural and performance inhomogeneities in the finished products. With the injection temperature or the edge width increasing, the discrepancy of resin conversion and resin molecular weight in the mould cavity is more evident. This study is helpful for understanding the complicated relationship among the processing variables, resin structures, and properties. POLYM. COMPOS., 2011. © 2011 Society of Plastics Engineers     

Conversion of Recycled Polymers/Fibers Into Melt-Blown Nonwovens

Being a simple one-step process for converting polymer directly into a nonwoven fabric, melt blowing is ideally suited for processing of several recycled plastics. The process uses hot air to draw the fibers and does not require precise, individual control of each filament as in the conventional fiber-spinning processes. Recycled polypropylenes (PPs) from several sources were investigated as candidates for melt blowing. Waste from spun-bond line and spun-bond-melt-blown-spun-bond (SMS) fabrics were pelletized and then melt blown at our facility. The feasibility of using a melt-blowing line with an extruder gear pump unit to remelt the waste fibers/web and feed it with the molten virgin polymer stream coming from the main extruder was explored. A 1000 MFR virgin PP resin and fabrics produced from that polymer were used for this investigation. Fabrics were characterized in all the cases for their performance properties. Some of the relevant data are reported here. It was observed that in most of the cases, fabrics with good properties could be produced at high throughputs, thus demonstrating that most of the plant waste can be reused.     

Effect of solid-state curing on the viscoelastic properties of poly(phenylene sulfide)

PPS is a thermosetting/thermoplastic resin. The resin, upon exiting the polymerization process, is generally a low viscosity, low molecular weight material. The thermosetting character is therefore exploited in a solid state cure process in the presence of air at elevated temperatures. This produces a resin with a more desirable property profile. Melt state dynamic mechanical measurements have been made on a series of cured PPS resins to elucidate structural changes that occur on the molecular level during the cure process. Increases in viscosity, non-Newtonian behavior, and relative elastic response were observed with increasing cure time and have been attributed to an increasing molecular weight and broadening molecular weight distribution achieved through branching/crosslinking. The effects of various environments on curing have also been investigated. © 1993 John Wiley & Sons, Inc.     

BOPP烟用包装膜专用树脂结构性能研究

对气相法聚丙烯生产的双向拉伸聚丙烯(BOPP)烟用包装膜专用树脂F 1002进行了结构性能研究。研究结果表明，烟用包装膜专用树脂具有特征性分子量及其分布，即既含有较高的分子量组分，又含有适量低分子量组分，从而保证其在双向拉伸成型工艺中具有较高的熔体强度及熔体流动稳定性，使得制品厚度均匀性优异。同时，适宜的等规指数(96．5％～97．5％)及其等规序列分布特性，使采用均聚型烟用包装膜专用树脂加工成型的BOPP薄膜具有挺度高，满足烟用包装膜的特性要求。     

中分子质量环氧树脂合成新工艺

采用了双酚A与环氧氯丙烷醚化生成氯醇醚,再与双酚A反应并经过闭环反应合成中分子质量环氧树脂新工艺,可较大幅度提高环氧树脂的质量。