丙烯酸接枝改性对锦纶66染色性能的影响

以丙烯酸接枝改性锦纶66为主要研究对象,用阳离子红5BL在95℃下对其进行染色,研究改性锦纶66与阳离子染料在弱酸性染浴中的染色性能,探讨丙烯酸接枝改性率对改性锦纶66与阳离子染料的染色动力学影响.结果表明:阳离子染料上染改性锦纶66符合Langmuir吸附方式,与普通锦纶66阳离子染料染色相比,阳离子染料在改性锦纶66上的染色速率增加,半染时间缩短,扩散系数增大,染色亲和力增加,水洗牢度提高0.5至1级.     

66 kV联络线备用电源自动切换装置功能的改进

为防止一次变全停、保证对用户连续可靠供电,针对66 kV系统双母线单主变压器运行的一次变和有小电源的末端变电所配有备用电源自动切换装置(简称备自投)的2种情况,通过系统故障后电流、电压的变化及继电保护装置动作情况对备自投装置动作影响的分析,提出备自投功能改进方案.即采取改变母差保护闭锁备自投方式及线路跳闸联跳主变一、二次断路器等改进措施,启动备自投,防止上述2种损失负荷情况的发生.     

尼龙66原丝物理性能指标测试方法的改进

简述了目前中国神马集团尼龙 6 6浸胶帘子布生产过程中原丝纤度及原丝沸水收缩率指标的测试方法及存在的弊端 .通过对国内外同行业浸胶帘子布生产过程中原丝物理性能测试方法的比较及我公司对比测试 ,对原始数据统计分析后 ,提出了可行的改进意见     

MPPO/PA66合金体系流变性能的研究

研究了MPPO／PA66组成、相容剂用量、加工温度等因素对MPPO／PA66合金体系流变性能的影响。结果表明相容剂用量的增加、加工温度的升高等都能降低体系的粘度，改善其加工流动性。     

锦纶66浸胶帘子布生产中的张力与控制

分析了帘子布生产中张力的作用及各区段的张力情况。张力应根据生产品种及浸胶帘子布的内在质量要求来选择，一般张力设定依据为拉伸区张力是干燥区张力的１倍，定型区张力是拉伸区张力的０．６５倍。同时应控制好各区段的温度，降低拉伸应力使锦纶６６帘子布拉伸均匀，提高帘子布的物理性能。     

Crystallization of polyamide 56/polyamide 66 blends: Non‐isothermal crystallization kinetics

The non‐isothermal crystallization behaviors of PA56, PA66, and PA56/PA66 blends were studied by differential scanning calorimetry. The Jeziorny and Mo's methods were used to analyze their non‐isothermal crystallization kinetics. The results indicated that Mo's method was better to describe the experimental data in this work. The crystallization rate of PA56 was much slower than that of PA66. The crystallization rate of PA56/PA66 blend was speeded up significantly with the increasing PA66 content when the PA66 content was less than 30 wt %. Further increase in the PA66 content only leads to relatively less increase of the crystallization rate in the PA56/PA66 blends. Activation energies have been determined with Friedman method. The activation energy of PA56/PA66 blends is decreased and lower than that of PA56. PA66 may play a role of nucleating agent toward PA56 to make it crystallize more easily in PA56/PA66 blends. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135, 46409.     

成核剂和乙烯马来酸酐共聚物混杂改性玻璃纤维增强聚酰胺复合材料

利用静电吸附方法制备了成核剂(P22)和乙烯马来酸酐共聚物(EMA)混杂改性的玻璃纤维(GF)增强体,并通过挤出成型制备了聚酰胺66(PA66)/改性GF增强体复合材料。采用扫描电子显微镜观察复合材料断面和刻蚀后断面。结果表明,P22吸附在GF表面可以诱导PA66在GF表面结晶,而EMA分子中的酸酐基团则可以与PA66分子链末端的氨基发生反应,使PA66附着在GF表面,改善了GF与基体的界面结合;良好的界面结合使PA66/GF-P22 、PA66/GF-EMA、PA66/GF-EMA-P22复合材料的层间剪切强度和动态储能模量(室温25 ℃)分别提高了18.3 %、25.4 %、32.4 %和15.4 %、24.1 %、35.9 %。     

Novel composite nanofibers based on polyamide 66/graphene oxide- grafted aliphatic- aromatic polyamide: preparation and characterization

New polyamide 66/graphene oxide (GO)-grafted aliphatic-aromatic polyamide (polyamide-imide) (PAI) (PA66/GOF) composites nanofibers were successfully prepared via electrospinning method for the first time. An polyamide imide (PAI) was synthesized using polycondensation reaction from a dicarboxylic acid and a diamine based on 4,4′-(4,4′-isopropylidenediphenyl-1,1′-diyldioxy) dianiline, and characterized by ¹HNMR and FTIR. Morphological, structural, thermal and mechanical characteristics of the nanocomposite fibers were investigated by means of SEM, TEM, WAXD, DMTA and TGA techniques. Composites nanofibers of PA66/GO, PA66/PAI and PA66/GOF with smooth surface, uniform structure as well as with diameter ranging from 195 to 784 nm were obtained. The GO incorporation caused a reduction in the nanofibers diameters. The TEM images showed that the GO was well dispersed in the PA66 nanofibers without significant aggregation. An approximately 10 °C temperature increase in the glass transition temperature of PA66 was achieved by addition of 0.5 wt% of PAI, resulting from aliphatic-aromatic structure of PAI. By the TGA results, an increase about 40 °C was observed in the thermal stability of PA66/PAI composite nanofibers in comparison with that of pure PA66 nanofibers.     

脱模剂对尼龙66结构与性能的影响

筛选了4种尼龙(PA)66用内脱模剂,研究了脱模剂与PA66的粘附作用,以及对PA66脱模性、力学性能、流变性能和结晶性的影响。结果表明,脱模剂使PA66注射成型制品的最佳成型周期缩短、成品率提高、表面光洁,并且提高了PA66的流动性和力学性能。其中脱模剂S101还兼有成核剂的作用,使PA66的结晶速率加快。     

Influence of thermal processing on the perfection of crystals in polyamide 66 and polyamide 66/clay nanocomposites

A study of the changes in crystal perfection of polyamide 66 (PA66) and polyamide 66/clay nanocomposites (PA66CN) due to different thermal processing was carried out. We designed three series of thermal processing including melt-quench (MQ), post-annealing MQ sample (MQA), and melt–slow cooling–annealing (MSA). The annealing temperature was set as 180 or 210 °C, which is within Brill temperature range of PA66. Fourier transform infrared (FT-IR) spectroscopy and wide angle X-ray diffraction (WAXD) were employed to characterize the perfection in short-range order and long-range order structures, respectively. The results showed that the crystal perfection of PA66 and PA66CN with different thermal processing is quite different, and the changing fashions with thermal processing for different ordered structures are not similar. In this work, MSA is optimal thermal processing for high crystallinity and crystal perfection. Exfoliated nanoclay layers exert considerable impact on the perfection of long-range ordered structures, but little on that of short-range ordered ones.