不同编织形式经编织物树脂渗透性及力学性能的研究

分析了衬纱角度不同和织物中添加玻璃纤维网格布的两种不同编织形式,对树脂在单轴向经编织物中流动速度的影响因素,同时对单轴向经编织物层压板的力学性能进行研究。利用真空辅助成型技术工艺(VARI),对单轴向经编织物进行树脂流动速度测试,通过树脂渗透的时间-距离曲线,来表征树脂在织物中流动的速度,从而分析影响树脂渗透性的因素;并选取其中三种单轴向经编织物的层压板测试拉伸和压缩性能,来分析编织形式对力学性能的影响。结果表明:衬纱角度不同和是否在织物中添加玻璃纤维网格布对树脂流动速度有明显的影响,衬纱角度为90°经编织物的树脂流动速度大于衬纱角度为±45°的经编织物,添加玻璃纤维网格布有利于树脂在单轴向经编织物中流动;衬纱角度为90°的单轴向经编织物拉伸性能最好,衬纱角度±45°的单轴向经编织物压缩性能最好;添加网格布对单轴向经编织物拉伸性能没有影响,不添加网格布的单轴向经编织物的压缩性能较好。     

建筑与土木工程领域新型经编针织物设计探讨

近十几年建筑与土木工程领域使用纺织材料进入高速发展时期,应用领域不断拓宽,经编织物及其增强复合材料逐渐成了建筑与土木工程领域纺织品的主力军。该文在双针床拉舍尔经编机上设计生产了建筑物外墙增强的三维经编织物、三维经编间隔织物以及经编轴向织物作为基布、经涂层的膜结构材料,以期帮助我国建筑与土木工程领域,经编材料产业向着健康、高效的方向发展。     

《GS0406》型双梭口刚性剑杆织机

目前,国外用于玻璃纤维厚重型织物织造的剑杆织机以西德道尼尔(Dornier)、法国阿尔萨斯(MAV-V)、西班牙依维(IW-ER)、英国温马克(onemack)等几种为主.多采用浸透性好的直接无捻粗纱织造方格布,织机已向宽幅发展,Dornier织机可生产3m宽的织物.     

经编多轴向织物

多轴向技术在国外是20世纪70年代后期发展起来的一种新型制造技术。由于现代纺织技术的发展和对纺织品要求的不断提高,90年代对多轴向技术得到广泛研究和推广应用。近年来,以碳纤维和玻璃纤维织物为增强结构的先进复合材料已广泛应用于航空航天等高科技领域。以往纺织复合材料增强体多采用机织方格布。由于传统机织物组织结构中的纱线处于弯曲状态,使得高性能纤维机织物中纤维性能不能充分发挥,影响复合材料的性能。然而,经编多轴向织物是由多层伸直且平行排列的纱线层(常加入短切毡)利用经编结构的组织绑缚在一起而形成的。这类织物经树脂…     

专利文摘

正用于电缆弓绞机的高强度复合线缆绞弓的制备方法本发明公开了用于电缆弓绞机的高强度复合线缆绞弓的制备方法,它包括:(1)材料选取:分别选取经过裁剪后形状和尺寸一致的东丽T700碳纤维单向布、K49芳纶单向布和东丽碳纤维方格布;(2)铺层赋型:将东丽T700碳纤维单向布和K49芳纶单向布交叉堆叠形成复合层,将2张东丽碳纤维方格布分别作为复合层最外层和最内层,复合层的相邻两层之间涂刷有灌注型环氧树脂,     

玻璃纤维织物的产品和应用

玻璃纤维布主要用作工业技术织物,只有某些有特殊要求的民用织物才采用玻璃纤维织造,如有阻燃或不燃要求的帷幔:窗帘、贴墙材料和地毯基布等.用作工业技术织物的玻璃纤维布在机械性能、物理性能方面比民用织物有更严格的要求,这些性能取决于纤维的性能和织物结构.织物中纱线的配置情况和彼此联结情况统称为"织物结构",     

蒙皮铺层形式对泡沫夹芯结构准静态压痕试验的影响

研究了准各向同性铺层泡沫夹芯结构蒙皮铺层形式对结构准静态压痕(QSI)试验的影响。通过对比结构吸能效率、失效机理以及底部面板失效挠度,发现方格布蒙皮试样失效主要以纤维断裂为主,含有单向布的试样失效主要以分层破坏为主,方格布与单向布混合铺层试样失效包含分层以及纤维断裂,具有较大的吸能效率。此外,底部蒙皮失效挠度与结构蒙皮以及夹芯结构性能相关,与吸能效率没有直接关系。     

橡胶制品基布的选择和性能

介绍了橡胶制品基布的基本性能和基本要求,从纤维材料的选择,机织物、取向经编织物、三维织物等织物结构的选择以及基布预处理方面述评了橡胶制品基布的选择和性能。     

经编轴向针织物线圈结构模型的研究

多轴向经编技术在国外已得到广泛推广和应用,在国内正处于起步阶段。多轴向经编针织物的线圈结构对复合材料的性能有很大的影响。本文介绍了经编针织物线圈结构模型的研究历史,并对经编轴向针织物线圈结构模型进行了详细的分析讨论,主要线圈结构模型包括以经平和编链为地组织的经编单轴向织物线圈结构模型、经编双轴向织物线圈结构模型以及经编多轴向织物线圈单胞分析模型和三维模型。     

橡胶制品基布及其预处理方法

介绍橡胶制品基布的纤维材料种类、织物结构和处理方法.聚酯以其较高的性价比成为橡胶增强材料的首选,天丝有望成为优良的橡胶制品基布材料.常见基布织物按结构分为机织物、取向经编织物和三维织物,三维织物是一种先进的结构材料.棉纤维通过干燥减少水分,合成纤维通过预处理解决潜在收缩和粘合问题。     

VISUALIZING THE ENTRAPMENT OF AIR POCKETS IN THE SHELL OF A HEMODIALYZER DURING WET-OUT

An experimental study of the wet-out of the shell-side of a commercial hollow fiber hemodialyzer is presented. Using X-ray Computed Tomography, we followed the movement of water into the shell of an initially dry unit. Local values of fiber packing fraction were also determined from the dry images. During wet-out, water moved preferentially through regions of lower fiber packing. Additionally, air pockets were observed in regions of higher fiber packing that were bordered by regions of lower fiber packing. Thus, hydraulic permeability differences, due to non-uniform fiber packing, provide one mechanism for air entrapment.     

双氨基硅烷偶联剂在无碱玻璃纤维布后处理中的应用研究

将双氨基硅烷偶联剂KH-843尝试使用到无碱玻璃纤维布后处理中进行试验,与常见单氨基硅烷偶联剂KH-550和环氧基硅烷偶联剂KH-560对比,对比它们配制成水解溶液的表面张力,对比使用它们处理后的玻璃纤维布的浸透性;将双氨基硅烷偶联剂处理的玻璃纤维布浸胶制成半固化胶片后,压制成层压板,测试主要的电学性能和力学性能指标,表明双氨基硅烷偶联剂应用于玻璃纤维布的后处理,可以有效提高玻璃纤维布的浸透性,能够满足复合材料行业的需求。     

短切原丝毡用乳液粘结剂专用乳液的合成

为了提高乳剂毡的粘结性,尤其是毡的浸透性、力学性能,研究了粘结剂配方中丙烯酸、丙烯酸丁酯、丙烯酸异辛酯、自制特殊单体以及乳化体系、单体配比等对粘结剂性能的影响。其主要是在合成过程中尽量调整最佳单体配比、乳化剂用量,尽量减小毡在苯乙烯中浸透速度、浸透终态的影响。     

Effect of screw design on fiber damage in extrusion compounding and composite properties

The mechanism of fiber length degradation during twin screw extrusion compounding and methods to reduce it through process and machine design are extremely important in discontinuous fiber reinforced composites. Fiber damage along the screw and the extruder die are determined for three screw designs with different mixing sections. The pellet quality, wet-out, and fiber dispersion in the extruded strands are compared. The fiber orientation distributions in the screw are determined to identify regions of higher fiber interaction. The fiber damage during subsequent injection molding has also been determined. The tensile, flexural, and impact properties of the tensile bars are compared. It is found that the residence time, fill-up, and the intesity of mixing during extrusion compounding have a predominant effect on fiber length degradation. The screw designs were seen to have a greater effect on the fiber damage in the 40 wt% glass-filled polymer than the 30 wt% glass-filled polymer. However, the mechanical properties of the 30 wt% glass-filled polymer showed an increasing trend compared to the 40 wt% glass filled polymer. A screw design that provides a balance of the fiber length, wet-out, and fiber dispersion was noted to give consistent mechanical properties.     

电子玻纤布生产过程中的开纤

对电子玻纤布开纤后能提高其与树脂的浸透性、PCB的耐热性、PCB的可靠性进行分析；总结了在电子玻纤布的生产过程中，如何进行电子玻纤布开纤的方法。     

氟碳表面活性剂在电子玻纤布表面处理中的应用

介绍了电子布的表面处理技术,用含/不含氟碳表面活性剂的偶联剂分别对电子玻纤布进行表面化学处理,对比了两种电子布的树脂浸透速度、半固化片的树脂含量和凝胶时间、半固化片层压工艺性能、制成的CCL的耐热可靠性。结果表明:用含氟碳表面活性剂的偶联剂处理后的电子玻纤布,应用性能得到显著提升。     

板材纱评价方法的建立

介绍了板材纱的评价方法研究过程;通过分析不同的树脂用量、固化剂与促进剂比例、固化时间和固化温度对板材纱的树脂浸透速度和终态玻璃钢片白丝情况的影响,总结出透明树脂与玻纤质量比为3：1,固化剂和促进剂各为1％,能较好地评价板材纱的性能。室温（25℃）情况下固化时间达到72h,树脂完全固化。     

氧化-还原低温引发短切毡用乳液粘结剂的研制

以过硫酸铵/硫代硫酸钠为氧化还原引发体系,在低温下研究制备出了短切毡用的醋酸乙烯酯与丙烯酸酯类共聚物粘结剂.结果表明:采用氧化还原引发体系可以使聚合反应低温快速进行;并从配方和工艺两方面调节制备出渗透快、内增塑、柔软性优良的玻璃纤维短切毡粘结剂.     

The effect of microwave resin preheating on the quality of laminates produced by resin transfer molding

Cycle times in resin transfer molding (RTM) of an unsaturated polyester have been reduced significantly using an in-line microwave resin preheating system. Microwave preheating lowers the resin viscosity during injection and modifies the thermal age of the resin, potentially influencing the quality of RTM laminates. The tensile properties of RTM laminates have been measured with regard to improved fiber wet-out by the lower viscosity resin. Degree of cure measurements have been included to establish the effect of microwave preheating on resin conversion within the laminate. Local pressure that develops within the mold during the cure phase can lead to mold deflections. Variations in the laminate thickness associated with these deflections are presented, and the use of microwave resin preheating to reduce these variations is discussed.     

Mechanical performance of various nylon 6 composites formed by in-situ polymerization of caprolactam

This paper describes the fabrication and mechanical characterization of composites made by incorporating various types of glass as bead or fiber into an activated caprolactam melt, which is then caused to anionically polymerize to a nylon 6 resin. Three types of composites are discussed and compared under separate headings: glass bead filled, sheet reinforced with a random fiberglass mat, and sheet reinforced with a unidirectional fiberglass mat that is studied under transverse loading to emphasize the role of the nylon 6 matrix resin. High molecular weight, better wet-out and adhesion to the reinforcement, and cold drawing of the polycaprolactam resin lead to homogeneous cavitation that increases composite toughness in comparison to epoxy or other nylon matrices of equivalent stiffness.