纳米硫酸钡增强增韧尼龙66

通过熔融共混法制备了纳米硫酸钡增强增韧尼龙66复合材料。研究了纳米硫酸钡含量对增强增韧尼龙66复合材料力学性能的影响。结果表明，纳米硫酸钡对尼龙66有显著的增强增韧作用。尼龙66的韧性、刚性和强度随着纳米硫酸钡含量的增加先增后减，在纳米硫酸钡质量分数为3％时，力学性能最优；对比空白样，缺口冲击强度提高了17．1％，弯曲强度和模量分别提高了5．74％和11．57％，拉伸强度和模量稍有提高。     

国外动态

尼龙纳米复合材料美国ＲＴＰ塑料配混公司已生产出据称是第一种尼龙纳米复合材料,其中通过一种特殊的混配法添加有３％～５％有机粘土混合体。这种尼龙／有机粘土纳米复合材料可用于生产轻质零部件,其冲击强度与纯尼龙－６相近,但热挠曲温度高５３％,拉伸强度高６３％。使用填充３０％矿物的尼龙混料也能达到这样高的热挠曲温度,但密度增加２０％,因此用以制成的零部件较重。在设计、研制这种新材料时,ＲＴＰ公司在尼龙－６中添加一种有机改性处理的云母状粘土,粘土分离成微细的薄片,均匀分散在整个尼龙树脂基质内。１ｇ分散的粘土…     

磨碎玻璃纤维在MC尼龙中的应用研究

考察磨碎玻璃纤维对铸型(MC)尼龙复合材料填料分布、物理力学性能的影响,以及增韧剂对MC尼龙复合材料韧性的影响。结果表明,磨碎玻璃纤维改性MC尼龙的物理力学性能优良,当加入10％的磨碎玻璃纤维时,制品收缩率降低,热变形温度提高20℃,制品具有填料分布均匀、外观光泽优良等优点;制品的拉伸强度比纯MC尼龙提高26％,弯曲强度提高13％,压缩强度提高36％。加入增韧剂六甲基磷酰三胺后,复合材料的韧性大幅度提高,添加量为5％-10％时,复合材料的综合力学性能最佳。     

己二酸市场前景及发展建议

己二酸是一种重要的有机化工原料,己二酸主要用途可按尼龙、非尼龙产品分类。目前世界上己二酸用于制造尼龙66约占总产能的73％,在非尼龙产品上的用途约占总产能的27％。己二酸在尼龙产品方面的用途主要是通过和己二胺的缩合反应生产尼龙66盐,尼龙66盐进一步缩聚反应可以生产尼龙66纤维和尼龙66树脂。     

尼龙6/MYC共混物的熔融纺丝性能研究

用NYC对尼龙6进行改性,通过双螺杆挤出机共混造粒后再熔融纺丝,研究了改性尼龙6的性能。结果表明随着NYC含量增加尼龙6的结晶温度增加,而熔融温度和熔体流动速率降低;尼龙6纤维的最大可延伸比和不同倍率时的比强度都呈现先增加后减小的趋势,分别在NYC含量为0．5％时达到其最高值。     

成核剂对尼龙结构与性能影响的研究进展

从成核剂的作用机理和尼龙加工条件出发，将尼龙用成核剂分为无机、有机和高分子三类，并分别介绍了其最佳用量、应用情况及对尼龙结构与性能的影响。尼龙用成核剂用量一般要低于5％。成核剂的添加可加快尼龙结晶速率，缩短注塑周期；使球晶颗粒更细微化；改变制品收缩；拉伸强度和弯曲弹性模量增加，耐热性提高，断裂伸长率和冲击强度降低。     

国外信息

<正> 汽车销售量暴跌使尼龙树酯增长衰落经历长达50年的持续增长之后,美国尼龙树脂市场像国内汽车市场一样进入一个疲软时期,汽车制造是尼龙6/6的最大用户,其销售量连续暴跌。在美国尼龙6/6树脂生产量的35％～40％直接销售给国内汽车业,因而在12月份汽车销售量落下28％自然引起关注,尼龙树脂市场将迅速变疲软的一个征兆是推销时间可能很长。依照一家尼龙生产厂商提供的数据,在过去20年中尼龙6/6市场的年平均增长率约为10％。1988年达空前未有的13％的增长率,那时汽车销售量增加,并且发现了该材料的新应用,因而需求增加。据一家生产厂商的估计,1989年的增长率可能只有5％,这一下滑是理所当然的,此时国民生产总值增长停滞,直接影响到该工业增长的逆转。生产厂商们现在认为,同一时期尼龙工业增长可超过国民生产总值增长2或3倍,整个塑料工业可在长时     

中国推动全球尼龙6需求增长

美国化学品市场协会（CMAI）：根据预测,中国对尼龙6的强劲需求正推动这一工程聚合物市场的日益增长,预计到2015年,全球的尼龙6需求年均增长速度将接近5％。     

我国已二酸产业面临发展中的挑战

己二酸最大的用途是制造尼龙66,它占世界总产能的73％。尼龙纤维占其总市场的47％．尼龙树脂占26％,非尼龙部门占27％,其中聚氨酯是最大的用途,其他用途为增塑剂、树脂、涂料和聚酰胺4,6。己二酸也用于生产湿式增强树脂,用于制取造纸化学品和合成润滑剂及润滑脂。     

世界尼龙工程塑料需求增长强劲

据英国PCI纤维和原料咨询公司预计,尼龙工程塑料将成为尼龙最大的最终应用市场。1990～2000年全球尼龙消费以年均2.7％速率递增,但2000～2005年平均增长速率将下降为1.2％。2003年世界尼龙工程塑料需求比上年增长4％,总量达190万t左右。按尼龙加工制品计,西欧是尼龙     

增强尼龙在离心泵密封环上的应用

选用具有良好力学性能及优异摩擦性能的增强尼龙作为离心泵密封环的材料,根据离心泵的结构,给出了密封环的密封结构形式及配合尺寸。试验表明,增强尼龙密封环的使用寿命达8000h以上,耐磨性、耐腐蚀性及抗汽蚀性良好．     

拉伸速率对尼龙6力学性能和颈缩区结晶度的影响

以己内酰胺为原料,通过开环聚合法制备了尼龙6材料。利用电子万能试验机对尼龙6材料进行了10,20,50 mm/min三种不同速率的拉伸实验,结果表明,随着拉伸速率的增加,尼龙6的屈服强度略有增加,而断裂伸长率和断裂能则大为减少。利用差示扫描量热仪对拉伸后试件的结晶度进行了测试,结果表明,在颈缩区有新的晶型生成;随着拉伸速率的增加,结晶度也随之增大,当拉伸速率为50 mm/min时,其颈缩区结晶度比初始结晶度提高了27.5%。     

旋动式人工流产器尼龙旋流环的研制

介绍旋动式人工流产器的工作原理、结构及组成，探讨旋流环的制备方法。通过对旋流环的模具设计、材料选择、工艺参数优化，研制出旋动式人工流产器尼龙旋流环。经检测，该旋流环的各项技术指标均达到设计要求，经临床初步试用证明，产品符合临床要求。     

铸型尼龙活塞环的研制

采用铸型(MC)尼龙活塞环代替玻纤增强聚四氟乙烯(PTFE/GF)活塞环用于空气分离器,活塞环的使用寿命为PTFE/GF活塞环的1.5倍。分析了MC尼龙活塞环优于PTFE/GF活塞环的原因。     

碱性电池密封圈欠注原因分析与对策

结合尼龙66(PA66)碱性电池密封圈尺寸小、精度要求高的特点,全面分析了预防电池密封圈欠注的设计及制造的关键技术.列出了碱性电池密封圈欠注的原因,系统阐述了电池密封圈注塑中欠注缺陷的解决方法.     

柴油机用GF/Nylon6冷却风扇破坏的原因及改进措施简

介绍了柴油机冷却风扇的结构,生产风扇的材料及大众公司尼龙6性能,分析了环形风扇发生疲劳破坏的原因及主要裂纹起源,提出了改进冷却风扇性能的措施.     

Reactive extrusion for the synthesis of nylon 12 and maleated low‐density polyethylene blends via the anionic ring‐opening polymerization of lauryllactam

Nylon 12 was successfully synthesized in a twin‐screw extruder via the anionic ring‐opening polymerization of lauryllactam (LL). Maleated low‐density polyethylene (LDPE–MAH) was added to improve the mechanical properties of nylon 12. The in situ blends of nylon 12 and LDPE–MAH were characterized by mechanical testing and scanning electron microscopy. With increasing LDPE–MAH content, the tensile strength and flexural strength decreased, whereas the blend had improved impact strength and achieved supertoughness when the content of LDPE–MAH was 30 wt %. In the in situ formed low‐density polyethylene‐g‐PA12 copolymer, the domain of the LDPE–MAH phase was finely dispersed in the nylon 12 matrix. The good interface between the two phases demonstrated that LDPE–MAH could be used as a macromolecular activator to induce the polymerization of LL. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

2-Pyrazoline Dyes for Wool and Nylon

A range of yellow fluorescent 2-pyrazoline acid dyes has been synthesized. Their spectral and dyeing properties (on wool and nylon) depend both on the nature of the substitution pattern of the dye and on the nature of the fibre substrate. Exhaustion and fastness to washing, which are better on nylon than on wool, are improved by substituents attached to the 2-pyrazoline ring. Fastness to light is independent of the fibre and is increased by substituents on the 4- and 5- positions of the 2-pyrazoline ring. The fastness properties of the pyrazoline dyes were compared with those of C.I. Acid Yellow 7.     

Oil‐impregnated monomer casting nylon composites reinforced by graphene oxide and Lanthanum(III) chloride

Oil‐impregnated monomer casting (OMC) nylon composites reinforced by graphene oxide and Lanthanum(III) chloride (LaCl₃) were prepared by anionic ring‐opening polymerization in the presence of sodium hydroxide catalyst and toluene‐2, 4‐diisocyanate cocatalyst. The cross‐linked GO was formed by the coordination and electrostatic interactions between La³⁺ and the carboxyl on the edge of GO, which resulted in an obvious reinforcement for the OMC nylon composites. The effects of different rare earth contents on mechanical and tribological properties of the composites were carried out. The results showed that the composites exhibited excellent comprehensive properties when 0.01 wt% GO and 0.007 wt% LaCl₃ were incorporated in OMC nylon. The elastic modulus, flexural strength, flexural modulus, compressive strength, notched impact strength, and elongation‐at‐break for the OMC nylon/GO/LaCl₃ composites increased by 6.1, 9.9, 18.2, 7.2, 40.8, and 24.4%, respectively, and the tensile strength was slightly improved. In addition, the abrasion quantity was reduced. POLYM. ENG. SCI., 59:982–988, 2019. © 2019 Society of Plastics Engineers     

The synthesis and application of some aziridinyl disperse dyes

The aziridinyl group has been introduced as a terminal substituent into a series of monoazo disperse dyes; the dyes absorb hypsochromically in comparison with their counterparts containing larger terminal ring systems. When applied from aqueous dyebaths the dyes exhibit higher wash fastness on nylon 6.6 and diacetate fibres than conventional dispersedyes of similar structure and relative molecular mass. On polyester and triacetate fibresthe aziridinyl dyes display similar wash fastness to conventional dyes. Dye polymerisation and/or covalent fixation may account for the observed high fastness of the dyes on diacetate and nylon fibres. With the exception of nylon 6.6, the aziridinyl dyes display lower light fastness than conventional disperse dyes on the fibres studied, this being attributable to the greater susceptibility of the aziridinyl dyes to oxidative rather than reductive photodegradation.