偶联剂处理对碱式硫酸镁晶须填充UP树脂浇铸体力学性能的影响

EFFECTS OF TREATMENT WITH COUPLING AGENTS ON MECHANICAL PROPERTIES OF Mg_2(OH)_2SO_4 WHISKER FILLED UP RESIN CASTINGS

利用钛酸酯类偶联剂NDZ101、NDZ401和硅烷类偶联剂KH550、KH570对碱式硫酸镁晶须进行处理,研究了几种偶联剂及其加入比例对晶须填充不饱和聚酯树脂(UP)浇铸体力学性能的影响,并结合应力-应变曲线和SEM的图片,对试验结果进行了讨论。实验结果表明,采用偶联剂处理晶须可改善其填充UP树脂浇注体的拉伸强度、拉伸模量、弯曲模量和冲击强度。其中,采用2%KH570进行处理,拉伸强度改善幅度最高,可提高47.54%;采用3%NDZ101进行处理,拉伸模量和弯曲模量均获得最大幅度的提高,分别为65.99%和69.33%;而采用4%KH550进行处理,却可最大幅度地提高冲击强度,为29.21%。对弯曲强度而言,偶联剂处理总体上对其影响效果不如其它的力学性能那样明显。相对而言,硅烷类偶联剂的效果优于钛酸酯类的偶联剂。加入4%KH570和5%KH550时获得的弯曲强度最大,分别为54.43MPa和53.19MPa,较未处理的浇铸体弯曲强度分别提高了25.10%和22.25%,而采用NDZ101或NDZ401,弯曲强度值却基本上都下降。碱式硫酸镁晶须填充UP树脂浇铸体的断裂属于脆性断裂。

Four kinds of coupling agents NDZ101, NDZ401, KH550 and KH570 are used to treat Mg2 （OH） 2 SO4 whisker. Then, the effects of the treatment with coupling agents on the mechanical properties of Mg2 （OH） 2 SO4 whisker filled UP resin castings are studied and compared with those of pure UP resin castings. The typical stress-strain curves of the tests and SEM analysis of the impact fratured speciments are investigated. Results show that the mechanical properties including tensile strength, tensile modulus, flexural modulus and impact strength can be improved by treating the whisker with any kind of coupling agents. Among these properties the tensile strength can be increased by 47.54%, when the whisker is treated with KH570 by wt 2%. As for the tensile modulus, flexural modulus and impact strength, the best addition of NDZ101 is 3%, NDZ101 3% and KH550 4% respectively and properties can be accordingly increased by 65.99%, 69.33% and 29.21%. But treating with coupling agents are not so good for the improvement of flexural strength as for other properties. When KH570 and KH550 are used by 4% and 5%, the greatest values of flexural strength, i. e 54.43MPa and 53.19MPa, are obtained. However, the flexural strength will be decreased when NDZ101 or NDZ401 is used. The breaks of both the pure UP resin casting and the casting after treatment by coupling agent are fragile.