铁黄颜料的表面改性及其在超高分子量聚乙烯中的应用

Surface modification of iron oxide yellow and its application in ultra-high molecular weight polyethylene

为提高铁黄颜料(ZnFe_2O_4)在熔纺过程中与超高分子量聚乙烯(UHMWPE)的相容性,采用硅烷偶联剂KH-570对ZnFe_2O_4铁黄颜料进行表面改性,通过亲油化度、Zeta电位、红外光谱和接触角等表征手段考察了偶联剂用量、超声反应温度和反应时间对改性效果的影响,并研究了硅烷偶联剂改性对ZnFe_2O_4铁黄颜料与UHMWPE共混体系之间的相容性影响。结果表明:在偶联剂、去离子水与无水乙醇体积比为1∶1∶1.5条件下,优化工艺为偶联剂用量占颜料质量的25%,65℃下超声反应2.5 h;所得改性ZnFe_2O_4铁黄颜料的亲油化度值为49.85%,Zeta电位为41.40 mV;接触角为154.5°,表面由亲水性转为亲油性。扫描电镜和熔体力矩测试结果表明,ZnFe_2O_4铁黄颜料在UHMWPE共混体系中的相容性得到明显改善。

In order to improve the compatibility of iron oxide yellow ZnFe204 with ultra-high molecular weight polyethylene during the melt spinning process, iron oxide yellow ZnF%O4 was modified with silane coupling agent KH-570. The influences of the dosage of coupling agent, reactive time and reactive temperature were characterized by oil-absorbed value, Zeta potential, Fourier transform infrared spectrocopy（FT-IR） , scanning electron microscopecom and contact angle, etc. The results show when the volume ratio of coupling agent to deionized water to anhydrous ethanol is I： l： 1.5, the optimal modification process is coupling agent accounting for 25% of pigments, and ultrasonic reacting at 65 ℃ for 2.5 h. The modified pigment has the oil-absorbed value of 49. 85% , Zeta potential of 41.40 mV and contact angle of 154.5°. The surface property of iron oxide yellow ZnFe2O4 varies from hydrophilicity to lipophilicity. The SEM and torque of blend melt results show the compatibility of the modified ZnFe2O4 pigment in UHMWPE blend system are significantly improved.