Abstract:

In order to improve the compatibility of iron oxide yellow ZnFe2O4 with ultra-high molecular weight polyethylene during the melt spinning process, iron oxide yellow ZnFe2O4 was modified with silane coupling agent KH570.  The influences of dosage of coupling agent, reactive time and reactive temperature were characterized by the 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 1：1：1.5, the optimal modification process is coupling agent accounting for 25% of pigments, and ultrasonic 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 varied from hydrophilic to lipophilicity. The SEM and torque of blend melt results show the compatibility of the modified ZnFe2O4 pigments in UHMWPE blend system are significant improved.

Key words: silane coupling agent, iron oxide yellow pigment, ltra-high molecular weight polyethylene, surface modification, compatibility