碱式硫酸镁晶须/橡胶复合材料的制备

将超声分散后的硅烷偶联剂3-氨丙基三乙氧基硅烷改性碱式硫酸镁晶须（KH550-MgOS_W）分散液加入天然胶乳（NR）中，对其进行补强，制得绿色环保高性能的KH550-MgOS_W/NR复合材料。系统研究了KH550-MgOS_W/NR复合材料的力学性能、阻燃性能及热稳定性能。结果表明，用KH550改性后的MgOS_W与橡胶基体具有很好的相容性。KH550-MgOS_W/NR复合材料的力学性能、阻燃性能及热稳定性能均比纯胶有所提高。当KH550-MgOS_W与NR质量比为4%时，KH550-MgOS_W/NR复合材料的各项性能均达到最佳，300%定伸应力、拉伸强度、撕裂强度、断裂伸长率、交联密度比纯胶胶膜分别提高了25.0%、36.8%、37.3%、11.4%、44.2%，垂直燃烧等级由FV-1提高到了FV-0级，比纯胶的起始热降解温度（T₀）、最大热降解温度（T_p）和终止热降解温度（T_f）分别提高了6.2℃、5.2℃和4.1℃。

Preparation and characterization of magnesium oxysulfate whiskers/natural rubber composites

The magnesium oxysulfate whiskers (MgOS_W) were modified by silane coupling agent 3-triethoxysilylpropylamine(KH550), and the modified whiskers dispersion liquid was prepared by ultrasonic technology. MgOS_W/natural rubber (NR) composites were developed by the blending modified whiskers dispersion liquid with the NR latex. The morphology, mechanical properties, flammability properties and thermalstability properties of the KH550-MgOS_W/NR composites were investigated. The results show that modified MgOS_W have good compatibility with NR latex matrix. The properties of KH550-MgOS_W/NR composites are improved by the incorporation of modified MgOS_W into NR matrix.When modified whiskers mass ratio to NR is 4%, the performances of KH550-MgOS_W/NR composites achieve optimum results. Compared with pure NR, the modulus at 300%, tensile strength, tear strength, elongation at break and crosslink density of KH550-MgOS_W/NR composites are increased by 25.0%, 36.8%, 37.3%, 11.4%, 44.2%, respectively. The flame retardant grade of composites increases from FV-1 to FV-0. The initial thermal degradation temperature (T₀), maximum thermal degradation temperature (T_p), and termination of thermal degradation temperature (TT_f) of KH550-MgOS_W/NR composites markedly increase 6.2℃, 5.2℃ and 4.1℃, respectively, compared to NR.