玻璃纤维连续原丝毡在南京投产

玻璃纤维连续原丝毡在南京投产由南京玻璃纤维研究设计院承担的国家“八五”科技攻关项目“连续毡生产技术研究”取得成功，一条年产２００吨连续毡生产线近日在南京华光玻璃制品实业公司投产。连续毡是机械化成型玻璃钢制品的重要增强基村，是拉挤、ＲＴＭ成型工艺不可缺...     

连续毡成型工艺关键部件--气流抛丝嘴

在玻璃纤维连续原丝毡的’二步法”成型工艺中，气流抛丝嘴是铺毡工艺中的核心部件之一，其性能优劣严重影响连续毡的均匀性、产量和能耗的高低。它具有以下三方面的：以一定的吸力牵引抛丝对辊送下的原丝，减少缠辊现象；将分好束的原丝以尽可能宽的尺寸均匀分散开，提高成毡均匀性；提供原丝成圈的脉冲动力。连续毡中的丝圈相当重要，可增加连续毡的强度、膨胀性及“流动性”、延伸性。经过多次反复的研究，我们先后研制出了几种抛丝嘴，并用于生产。     

风机叶片用玻璃纤维连续毡对比分析

针对兆瓦风机叶片用玻璃纤维连续毡,将国产连续毡与进口连续毡进行了同等实验条件下的对比分析,分别考察了两种玻璃纤维连续毡的均匀性、导流性能、力学性能以及对玻璃纤维复合材料性能的影响等。结果表明,国产连续毡力学性能和对玻璃纤维复合材料力学性能影响均相当于进口连续毡,可以适用于制造兆瓦级风机叶片,但是需要在成型的稳定性上做进一步改进。     

玻璃纤维连续原丝毡

玻璃纤维连续原丝毡是一种增强用无纺材料。它有两大类,一类是卷曲连续原丝毡,一类是连续原丝针刺毡。通常人们所说的连续毡即指卷曲连续原丝毡,本文所叙述的也是这种毡。连续毡由分束原丝卷曲交缠、并以液态或粉末粘结剂粘合而成。     

欧文思科宁公司增加连续原丝毡产量

拉挤和树脂迁移模型（ＲＴＭ）等领域对于连续原丝毡（ＣＦＭ）的需求量日益增长，促使欧文思科宁公司进一步扩大生产能力。今年四季度，该公司将把宾州Ｈｕｎｔｉｎｇｔｏｎ市的连续原丝毡生产线的生产能力再增加１５００吨。这是该公司今年内第二次增加连续原丝毡的生产...     

用于生产具有热塑性基材的复合材料的纤维增强材料的可变形毡

本发明涉及可变形毡，它由至少一个网构成，该网包含至少一种增强材料和至少一种热塑性材料，这些材料呈切断丝或连续丝状，并且这些丝彼此粘结在一起，以便这种毡在任何方向上的断裂伸长率为至少50％，优选地100％～150％。本发明还涉及可变形毡的生产方法，该方法在于形成一种所述丝的网，在能使这些丝适当粘结的条件下处理这个网以及收集所得到的毡。     

玻璃纤维连续原丝毡粘结机理初探

玻璃纤维连续原丝毡粘结机理初探南京玻璃纤维研究设计院邓洪赵东波陆景文梁素兰１概述玻璃纤维连续原丝毡的粘结工艺比玻璃纤维短切原丝毡难度大，尤其我们所采用的“二步法”成形工艺，其粘结难度更大于国外的“一步法”成形工艺。其原因是国外的原丝为新生态，直接拉丝...     

玻璃纤维连续毡用粉末粘结剂的研发

针对玻璃纤维连续毡湿态强度要求高的特点,创造性地提出了聚酯-环氧树脂型粉末粘结剂的设计思路。通过基体树脂设计、选择,配比研究、制备工艺选择等各项试验,制得的聚酯-环氧粉末粘结剂能满足玻璃纤维连续毡的各项性能要求。同时,以粉末粘结剂配方4制得的连续毡与进口连续毡进行应用性导流试验对比,证明其具有良好的湿态强度。     

玻璃纤维连续原丝毡的开发及应用

1 概述玻璃纤维连续原丝毡是一种新型的无纺增强基材,在国外已有近三十年的研究开发历史.连续毡主要用于各种玻璃钢机械成型,如拉挤成型、树脂传递模塑(RTM)、缠绕成型、高性能SMC成型等.连续毡具有各向同性、抗移性好、耐树脂冲剂、树脂浸透性好、机械强度高等综合应用特性,其它类型的毡片难以替代.连续毡可广     

RTM工艺中玻纤增强材料渗透率的测量与分析

通过对树脂传递模塑成型工艺中广泛使用的纤维增强材料——玻纤连续毡渗透率的测量和分析，建立了该增强材料在模具中的纤维体积含量与渗透率之间的关系，考察了纤维增强材料的渗透率与注模时间的关系，分析对比了纤维增强材料的结构型式对注模时间和纤维浸透性的影响。结果表明；随着纤维体积含量的增大，渗透率迅速下降，对于玻纤连续毡，其渗透率ｋ与纤维体积含量ｖｆ的关系可以表示为一个多项式；在恒定的压力下，渗透率大，注模需要的时间越短，体积含量相同的玻纤连续毡和玻纤方格布比较，玻纤连续毡的渗透率约大一倍，而所需注模时间约为玻纤方格布的１／２；玻纤方格布中存在渗透率相差特别大的两大区域是造成其浸透性差的主要原因。     

苎麻落麻无纺毡复合材料的研制

用无纺针刺法制备了苎麻落麻纤维毡，测量了毡的面密度及其分布，并用这种无纺毡制备了增强环氧、不饱和聚酯等树脂基复合材料，测试和讨论了其力学性能，用扫描电镜观察了复合材料的拉伸断面形貌，探讨了苎麻落麻纤维无纺毡复合材料的应用。所制得的苎麻落麻纤维无纺毡既可作为复合材料的表面毡使用，又可作为复合材料增强毡使用。     

床层不均匀对散羊毛干燥过程的影响

在均匀床层模型的基础上,用数值方法分析了羊毛床层不均匀对抽气转鼓干燥机性能的影响。提出了描述床层厚度分布的数学模型式。研究结果表明,进料不均匀分布导致产品平均湿含量增大和干燥机生产能力下降,因此进行干燥机设计时,可以在物料均匀分布模型设计的基础上,生产能力适当留有余地。     

Impregnation of thermoplastic resin in jute fiber mat

Impregnation rate of thermoplastic resin (polypropylene) in jute fiber mat and influence of relative factors on impregnation were studied, aiming to develop the continuous melt impregnation technique and to investigate the effect of impregnation rate and temperature on processing conditions and mechanical properties of natural fiber mat-reinforced thermoplastics. Influence of pressure on porosity of fiber mat and effect of melt viscosity on impregnation rate were also investigated. The modified capillary rheometer was used as apparatus and experimental data were analyzed based on the one-dimension Darcy’s law. Results showed that at a given pressure, the impregnation rate is inversely proportional to melt viscosity and jute fiber mat has higher porosity than glass fiber mat. The architecture, compressibility, permeability and fiber diameter of jute fiber mat were compared with those of glass fiber mat and their effects on impregnation were discussed further. It could be seen that the average diameter of jute fiber is much bigger; the porosity of jute fiber mat is significantly higher and inner bundle impregnation does not exist in jute fiber mat. Therefore, it is not difficult to understand why the impregnation rate in jute fiber mat is 3.5 times higher and permeability is 14 times greater. Kozeny constants of jute and glass fiber mats calculated based on the capillary model are 2950 and 442, respectively.     

浸润剂对玻璃纤维湿法毡工艺及性能的影响

考察了浸润剂对玻璃纤维拉丝工艺、玻璃纤维湿法毡工艺及力学性能的影响。研究结果表明：使用浸润剂后玻璃纤维拉丝工艺得到改善;湿法毡力学性能提高,其中使用偶联剂（A-174）处理的湿法毡拉伸强度为213,N/5cm、撕裂强度为2.1,N。经甲酸萃取湿法毡剩余玻璃纤维IR分析可知,使用偶联剂后,玻璃纤维与粘结剂有良好的作用,从微观上解释了湿法毡使用浸润剂后力学性能提高的原因。     

热塑性树脂浸渍黄麻纤维毡的研究

研究了热塑性树脂PP(聚丙烯)浸渍黄麻纤维毡的速率及相关因素,以解决天然纤维毡增强热塑性复合材料中连续熔融浸渍,考察了浸渍速率、温度等参数对其加工成型及力学性能的影响.用改装的毛细管流变仪作为实验装置,以一维Darcy定律处理实验数据,研究了压力对毡体空隙率以及熔体粘度对浸渍速率的影响.结果显示,相同的压力下,浸渍速率和熔体粘度成反比,麻纤维毡的压缩空隙率都要高于玻璃纤维毡.通过对纤维毡体结构、可压缩性、纤维直径以及毡体渗透率进行对比,进一步讨论了纤维毡浸渍速率的影响因素.表明麻纤维平均直径远大于玻璃纤维,纤维堆叠产生的空隙明显大于玻璃纤维且在麻纤维毡中不存在玻璃纤维毡中的束内浸渍,麻毡的浸渍速率约为玻纤毡的3.5倍,平均渗透率K约为玻纤毡的14倍.运用毛细管模型计算了两种毡体的Kozeny常数,其值分别为2950和442.     

Analysis of resin injection molding in molds with preplaced fiber mats. I: Permeability and compressibility measurements

This work presents the characterization of fibrous reinforcement mats in resin injection molding. The fiber mat characterization involved determining the mat permeability and compressibility. Mold filling experiments were conducted using two or more different fiber types in the mat stack, which created transverse porosity, permeability, and compressibility variations. The effect of these variations was studied by taking flow pressure measurements and observing the progress of the flow front of a non-reactive fluid filling a clear acrylic mold that contained the reinforcement mat stack.     

Impregnation of thermoplastic resin in jute fiber mat

Impregnation rate of thermoplastic resin (polypropylene) in jute fiber mat and influence of relative factors on impregnation were studied, aiming to develop the continuous melt impregnation technique and to investigate the effect of impregnation rate and temperature on processing conditions and mechanical properties of natural fiber mat-reinforced thermoplastics. Influence of pressure on porosity of fiber mat and effect of melt viscosity on impregnation rate were also investigated. The modified capillary rheometer was used as apparatus and experimental data were analyzed based on the one-dimension Darcy’s law. Results showed that at a given pressure, the impregnation rate is inversely proportional to melt viscosity and jute fiber mat has higher porosity than glass fiber mat. The architecture, compressibility, permeability and fiber diameter of jute fiber mat were compared with those of glass fiber mat and their effects on impregnation were discussed further. It could be seen that the average diameter of jute fiber is much bigger; the porosity of jute fiber mat is significantly higher and inner bundle impregnation does not exist in jute fiber mat. Therefore, it is not difficult to understand why the impregnation rate in jute fiber mat is 3.5 times higher and permeability is 14 times greater. Kozeny constants of jute and glass fiber mats calculated based on the capillary model are 2950 and 442, respectively. __________ Translated from Journal of Chemical Engineering of Chinese Universities, 2007, 21(4): 586–591 [译自: 高校化学工程学报]     

Fiber mat deformation in liquid composite molding. I: Experimental analysis

When a resin in injected into the mold in liquid composite molding, the preplaced fiber mat may deform near the inlet gate because of the high momentum carried by the injected fluid. A fiber free region near the gate followed by the fiber mat deformation may emerge. This phenomenon is most likely to occur when the stacked fiber mats have low permeability and the resin has high viscosity. A set of mold filling experiments were carried out using an instrumented metal mold and a small transparent mold to investigate the fiber mat deformation during mold filling. Experimental results showed that the fiber mat deformation was limited to a small region near the gate and that deformation greatly reduced the molding pressure. A forced fiber mat deformation employing a modified gate design was proposed to facilitate mold filling in liquid composite molding.     

短切原丝毡用玻璃纤维增强型浸润剂的研究

本文主要叙述了短切原丝毡 (简称短切毡 )用玻璃纤维增强型浸润剂的试验研究过程 ,重点讲述了短切毡用原丝必须具备的性能 ,通过实验最终得出了同时满足拉丝工艺、烘干工艺和短切毡成毡工艺的玻纤增强型浸润剂。该浸润剂赋予原丝良好的集束性、切割性、分散性和快速的浸透性 ,并提出满足这些性能原丝的硬挺度必须适中 ,这样的原丝才能生产出优质的短切毡     

麻纤维/玻璃纤维混杂增强聚丙烯复合材料的性能研究

采用新的混杂复合工艺,将不同形式的玻璃纤维、剑麻纤维、玻璃纤维毡与黄麻纤维毡用不同的混杂方式（Ⅰ层内,Ⅱ夹芯）混杂增强聚丙烯.研究结果表明,在强度和刚性得到明显改善的同时,冲击韧性得到了大幅度的提升,而且短纤维层内混杂和连续纤维夹芯混杂呈现出不同的特点,不同的铺层设计导致力学性能有明显差异.通过对材料断面的电镜分析看出,用短玻璃纤维和麻纤维毡混杂增强聚丙烯时,冲击破坏过程以界面脱黏为主,而用玻璃纤维毡和麻纤维毡混杂增强时,破坏断面中玻璃纤维存在大量的拔出现象.利用混杂效应理论公式计算了混杂效应系数,并和实测值进行了比较.