UHMWPE纤维高强度绳索的研究

研究了纤维捻度、粘结剂对超高分子量聚乙烯(UHMWPE)纤维力学性能的影响及浸胶UHMWPE纤维表面的耐磨性能。UHMWPE纤维的断裂强力随着纤维捻度的增加而下降；纤维表面浸胶处理后断裂强力提高，当UH—MWPE纤维中改性氯丁胶或聚氨酯粘结剂的合量为6％时，其断裂强力增加17．2％或13．9％。经聚氨酯粘结剂处理的UHMWPE纤维表面的耐磨性能最好。     

加工工艺对芳纶帘线性能的影响

研究加捻工艺和浸胶工艺对芳纶帘线性能的影响。结果表明：在一定捻度范围内,芳纶帘线的断裂强力随捻度的增大而降低,断裂伸长率随捻度的增大而提高;浸胶张力和浸胶温度对浸胶芳纶帘线的断裂强力没有明显影响;适当降低浸胶温度可提高浸胶芳纶帘线的粘合强度。     

硅烷偶联剂表面改性UHMWPE纤维的工艺优化

以硅烷偶联剂KH-550在不同条件下处理超高相对分子质量聚乙烯(UHMWPE)纤维,采用正交实验方法,以硅烷偶联剂KH-550的浓度(A)、处理温度(B)、处理时间(C)为因素,以UHMWPE纤维的断裂强力、界面剪切强度(τ)为实验指标,研究了硅烷偶联剂KH-550处理UHMWPE纤维的最佳工艺条件。结果表明:UHMWPE纤维断裂强力的影响因素主次顺序为A,B,C,τ的影响因素主次顺序为B,A,C;硅烷偶联剂KH-550处理UHMWPE纤维的最优工艺为硅烷偶联剂KH-550质量分数17.5%,处理温度55℃,处理时间7 h,在此条件下得到的UHMWPE纤维的断裂强力为41.15 cN,断裂强力损失率为2.44%,τ为1.359MPa,τ的增加率为35.22%。     

高模低收缩涤纶浸胶帘子布的开发研究

本研究开发出具有国外90年代先进水平的高模低收缩涤纶工业丝 研究了捻度对帘线断裂强力、断裂伸长、定负荷仲长的影响,并探讨了浸胶工艺对高模低收缩涤纶浸胶帘子布性能的影响。     

干热处理对UHMWPE短纤维结构与性能的影响

采用电热恒温鼓风干燥箱对超高相对分子质量聚乙烯(UHMWPE)短纤维进行干热处理,研究了处理条件对纤维外观形态、分子结构、力学性能的变化及其影响规律。结果表明:UHMWPE纤维的熔融温度为147.7℃,随着热处理温度的升高,UHMWPE纤维的纵向表面裂纹逐渐增多,且温度越高表面裂纹越明显;纤维分子的扭曲变形和伸缩变形运动随处理温度的升高而变得较为剧烈;纤维的结晶结构随处理温度的升高较未处理纤维也发生了较小的变化;当温度高于100℃时,UHMWPE纤维的断裂强力随温度的升高有所下降,加热时间越长强力下降越多;而温度及时间对断裂伸长率的影响具有等效作用;干热处理UHMWPE纤维的温度宜控制在100℃以内,时间宜12 h以内。     

结构设计对传动带用浸胶芳纶线绳性能的影响

分别采用1670dtex和1100dtex芳纶丝,研究结构设计对传动带用浸胶芳纶线绳性能的影响。结果表明：当原丝总纤度相同时,随着初复捻捻度的增大,捻度系数增大,线绳的初始断裂强力呈减小趋势,疲劳后断裂强力保持率呈增大趋势;当捻度相同时,增大原丝纤度,可提高线绳的耐疲劳性能;当直径和捻度相同时,通过改变捻线结构,增大初捻捻度系数,保持复捻捻度系数不变,可使线绳的耐疲劳性能得到提高。     

对位芳纶骨架材料弯曲性能研究

本文介绍了对位芳纶长丝作为胶管骨架材料的特点。研究了捻度对芳纶长丝静态弯曲性能的影响。实验结果表明,随捻度的增加,拉伸强力呈现先增加后降低的趋势;钩接强力略微增加后降低,在低捻度及较高捻度下的钩接强力高于拉伸强力;打结强力基本不变,明显低于拉伸强力;拉伸断裂伸长率逐渐增加,钩接和打结断裂伸长率基本不变,均低于拉伸断裂伸长率。针对破坏机理进行探讨。     

高性能纤维作为橡胶骨架材料的应用研究

研究聚酰亚胺纤维、芳纶纤维、玄武岩纤维、聚萘二甲酸乙二醇酯(PEN)纤维和聚亚苯基苯并二噁唑(PBO)纤维的工业丝性能及浸胶帘线的力学性能和粘合性能。结果表明:聚酰亚胺纤维和PBO纤维具有较高的强力和模量;聚酰亚胺纤维通过参考芳纶纤维的浸胶液配方进行浸胶处理,帘线与橡胶粘合性能良好;PEN纤维可以直接使用聚对苯二甲酸乙二酯(PET)纤维的浸胶方法进行处理;玄武岩纤维采用优化浸胶液配方进行浸胶处理,完全可以实现帘线与橡胶的良好粘合;PBO纤维采用目前现有浸胶方法较难进行表面接枝处理,与橡胶粘合性能较差。     

空气冷等离子体处理对UHMWPE纤维性能与结构的影响

采用不同功率、压力和时间的空气冷等离子体对超高相对分子质量聚乙烯(UHMWPE)纤维进行处理,测试其力学性能和摩擦性能,并对处理前后纤维的形貌进行观察。结果表明,经空气冷等离子体处理后,纤维的断裂强力有所降低,静摩擦系数和动摩擦系数均得到大幅度提升,纤维表面出现横向均匀刻蚀层,粗糙度增加。     

超高分子量聚乙烯纤维拉伸性能测试方法的研究

研究了超高分子量聚乙烯(UHMWPE)纤维干纱和浸胶纱的拉伸性能测试方法。结果表明,干纱法和浸胶纱法测得的强度结果无显著差异,模量和断裂伸长率存在着显著差异。与浸胶纱法相比,干纱法的模量高、伸长率低。同时,文中不仅对测试机理进行了分析,还建议模量和伸长率的测试应视测试数据的用途选择不同的测试方法。     

镁合金化学镀Ni-Cu-P合金耐磨性研究

在AZ91D镁合金上直接化学镀Ni-Cu-P合金,得到了均匀、致密的镀层,有良好的结合力,其耐磨试验结果表明:Ni-Cu-P镀层的磨损量仅为基体的43%。X-射线衍射图表明热处理后,Ni-Cu-P合金镀层结构发生了变化,耐磨性有所提高,其磨损量仅为基体的15%。     

Enhanced wear resistance of ultra-high molecular weight polyethylene fibers by modified-graphite oxide

A simple and feasible method to enhance the wear resistance of ultra-high molecular weight polyethylene (UHMWPE) fibers was reported. The graphite oxide (GO) prepared using improved Hummer's method was surface modified with hexadecylamine to improve its compatibility with UHMWPE. Combined with well-dispersion of modified-GO (m-GO) in dichloromethane and the fact that the viscosity of UHMWPE suspension can be decreased by dichloromethane, the well dispersed m-GO/dichloromethane was added into UHMWPE suspension to improve m-GO dispersion in UHMWPE fibers. Finally, UHMWPE fibers with different m-GO concentration were prepared using gel spinning technology. The effect of m-GO concentration on the structure and properties of modified UHMWPE fibers were investigated. The results indicated that the melting temperature and crystallinity of m-GO modified UHMWPE fibers increased with increasing of m-GO concentration, while the fiber's crystal sizes and orientation increased, thus the tensile strength of m-GO modified UHMWPE fibers remained almost undamaged. The introduction of m-GO is beneficial to the formation of smooth transfer film on fiber's surface, which enhanced the self-lubrication of UHMWPE fibers. Compared with pure UHMWPE fiber, the UHMWPE fiber containing 1.5 wt% m-GO had enhanced wear resistance by 55.4% and still maintained high tensile strength of 29.98 cN dtex⁻¹.     

基于正交设计的UHMWPE砂浆磨损试验研究

采用改制的UHMWPE砂浆磨损试验机,通过正交试验,利用重复试验的方差分析对UHMWPE的砂浆磨损失效特性进行试验研究.结果显示:分子量是决定耐磨性的主要因素,并在电子显微镜(SEM)下对UHMWPE磨损表面形貌进行观察,显示了UHMWPE的砂浆磨损规律.     

超高分子量聚乙烯改性尼龙6复合材料的力学性能研究

通过挤出方法制备了尼龙6（PA6）／超高分子量聚乙烯（UHMWPE）复合材料,考察了复合材料摩擦学性能和力学性能。用光学显微镜观察分析了复合材料磨损表面形貌。结果表明：复合材料摩擦性能较纯尼龙有一定的提高,当UHMWPE含量为5％和10％时,复合材料耐磨减摩性较好。但随着UHM-WPE含量的增加,复合材料的硬度、拉伸强度、伸长率有所下降。     

超高分子量聚乙烯纤维性能及应用概述

超高分子量聚乙烯纤维有着高取向度,高结晶度,强力、模量高,抗冲击,耐腐蚀,耐光照,耐挠曲,耐磨损等优点。它的密度比水小,介电性能好。超高分子量聚乙烯纤维的缺点是使用温度不高,耐氧化性能差,抗蠕变性能差,表面加工困难。正是超高分子量聚乙烯纤维自身所具有的这些特点,它在抗冲击防护,低温,耐压,海洋工程,渔业等领域有着广泛地使用。     

Tribological performance of self-lubricating polyurethane elastomer compounding with the modified ultra-high molecular weight polyethylene

Ultra-high molecular weight polyethylene (UHMWPE) powder was modified by surface treatment technology, then its wettability, dispersibility, mechanical, and tribological properties in polyurethane elastomer were studied. The testing results showed that after surface treatment, UHMWPE powder could infiltrate and disperse evenly in polyurethane, and build micro cross-link with the contact surface of polymer substrate, which is conducive to enhancing the internal stress of polymer and improving the mechanical properties. With a small amount of modified UHMWPE being added into the casting polyurethane (CPU) elastomer, the right-angled tearing strength increases and the abrasion loss decreases. Moreover, the elastomer surface self-lubricating performance of CPU compounding with modified UHMWPE is enhanced: compared with the neat CPU sample, the average friction coefficient of the CPU samples with 5%, 10%, and 15% of modified UHMWPE is reduced by 46.3%, 41.5%, and 39.0%, respectively, and the surface wear resistance is improved; under the high-load working condition, the CPU elastomer with 5% of modified UHMWPE has the optimal tribological performance.     

Development of UHMWPE modified PP/PET blends and their mechanical and abrasive wear behavior

In this study, polypropylene and polyethylene terephthalate blend were modified by incorporating different percentages of ultrahigh molecular weight polyethylene (UHMWPE) ranging from 1 to 5 phr. Modified blends were prepared by melt mixing the PP/PET blend and UHMWPE. Ultimate tensile strength of UHMWPE filled blend was determined at 10, 20, 50, and 100 mm/min cross head speeds of testing. It was found that increase of cross head speed from 10 to 100 mm/min increases the tensile strength of PP/PET/UHMWPE blends. Maximum ultimate tensile strength is exhibited by the blend containing 2 phr UHMWPE. Breaking strain of the UHMWPE modified and unmodified PP/PET blend increased with the increase of cross head speed due to the highly entangled chain structure of UHMWPE. Shore A hardness of the filled blends also increased from 341 to 356, which is highest for 2 phr UHMWPE. High stress abrasive wear of UHMWPE modified blend was determined by using Suga abrasion tester, model NUS‐1 Japan. Wear rate of the PP/PET(90/10) blends having 1, 2, and 5 phr of UHMWPE was determined at different loads such as 1, 3, 5, and 7 N and sliding distances from 6.4 m to 25.6 m. Wear rate values show that UHMWPE has prominent effect on abrasive wear of PP/PET blends. Addition of 2 and 5 phr UHMWPE improved the wear resistance of PP/PET blends at different loads, which has been explained on the basis of improved bonding as compared with pure PP/PET blend and increased hardness. Maximum abrasive wear rate reduction was achieved by adding 2 phr UHMWPE in PP/PET(90/10) blend. POLYM. COMPOS. 28:267–272, 2007. © 2007 Society of Plastics Engineers     

低温等离子体处理UHMWPE纤维表面性能的多指标优化

利用正交表安排试验,对超高相对分子质量聚乙烯(UHMWPE)纤维进行空气低温等离子体处理,测试各处理条件下UHMWPE纤维的力学和表面摩擦性能;采用矩阵分析法对多指标正交试验结果进行优化分析,找出最优方案并进行黏着性试验验证。结果表明:经空气低温等离子体处理后,UHMWPE纤维的断裂强度有所减小,表面静、动摩擦因数有较大幅度的提高;处理纤维的最优方案为功率50 W、压强15 Pa、时间150 s,此时纤维的断裂强度损失率仅为2.53%,剥离功为未处理时的4.25倍,说明由矩阵分析法得出的最优方案在保证纤维断裂强度损失很小的情况下,黏着性得到了很大程度的改善。     

超高相对分子质量聚乙烯纤维的低温等离子体处理

利用低温等离子体技术对超高相对分子质量聚乙烯(UHMWPE)纤维进行表面改性,用单因素试验和正交试验对改性后的UHMWPE纤维的静摩擦因数和断裂强力进行测试与分析,最终确定最优的等离子体改性工艺为压强50 Pa、功率100 W、时间180 s。对处理前后的UHMWPE纤维的毛细效应、表面形貌、红外光谱进行了测试和对比,结果发现:改性后的UHMWPE纤维的吸水性能明显增强,纤维表面变得凹凸不平,粗糙度和比表面积增大,纤维表面起伏数量增多,幅度变大,且出现了新的含氧官能团,有利于提高UHMWPE纤维表面的黏结性。