Abstract:

To obtain a kind of nano-Fe₃O₄ with double linkage, nano-Fe₃O₄ particles were surface functionalized by a silane coupling agent KH-570. Then a series of waterborne acrylic magnetic pressure-sensitive adhesive (PSA) modified by nano-Fe₃O₄ and surface functionalized nano-Fe₃O₄ were prepared through in situ polymerization, respectively. The nanoparticles and PSA were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermalgravimetry analysis (TG), scanning electron microscopy (SEM) and vibrating sample magnetometer (VSM). The experimental results showed that the waterborne acrylic pressure sensitive adhesives with good magnetic properties were successfully prepared with the addition of nano-Fe₃O₄, The magnetic properties of PSA were improved with the increasing of nano-Fe₃O₄ content. When the content of KH570-Fe₃O₄ was about 4% (mass), the PSA had the perfect adhesive properties. The thermal stability and adhesion properties of acrylate PSA were obviously improved by the addition of nano-Fe₃O₄ particles, especially by surface functionalized Fe₃O₄ particles. Furthermore, Compared to the pure Fe₃O₄, the surface functionalized Fe₃O₄ was better dispersed in acrylate PSA while the value of saturation magnetization of PSA decreased slightly.

Key words: KH570, surface functionalized, nano-Fe₃O₄ particles, acrylic emulsions, magnetic

摘要：

利用硅烷偶联剂KH570对纳米Fe₃O₄进行修饰,得到了表面含有双键的改性Fe₃O₄。将纯纳米Fe₃O₄及修饰后的纳米Fe₃O₄分别和丙烯酸酯单体混合,采用原位聚合法制备一系列丙烯酸酯压敏胶(PSA)。通过红外光谱(FT-IR)、X射线衍射(XRD)、热重分析(TG)、扫描电镜(SEM)以及振动样品磁强计(VSM)对纳米Fe₃O₄和PSA进行表征。结果表明:加入纳米Fe₃O₄后成功制备了具有良好磁性能的水性丙烯酸酯PSA,且PSA的磁性能随纳米Fe₃O₄含量的增大而增强,纳米Fe₃O₄加入量为4%(质量分数)时,PSA的粘接性能最佳;纳米Fe₃O₄的加入能显著改善PSA的热稳定性,提高PSA的粘接性能;相对于纯纳米Fe₃O₄,经表面修饰后的Fe₃O₄对热稳定性的改善效果更好,与丙烯酸酯聚合物的相容性更好,在压敏胶中分布更均匀而不团聚,但饱和磁强度稍有减弱。

关键词: KH570, 表面功能化, 纳米Fe₃O₄粒子, 丙烯酸酯乳液, 磁性