| Nano-ferrite was modified by the mixed acid of oleic acid and stearic acid, oleic acid, KH570 and SDS. The effects of different modifiers on hydrophobic stability of ferrite were studied. Groups on the surface of modified nano-ferrite were characterized by FTIR and thermal analysis. Measurement of transmission, magnetic response and active exponent indicated that hydrophobic stabilities of nano-ferrite were greatly improved by surface modification. The modification quality was the best when oleic acid and stearic acid were added together. The surface of nano-ferrite was modified with the mixed acid. The influences of several factors on the sulface modification of nano-ferrite were studied, including modifier content and temperature. According to these, the best technological conditions were described.UV curing coating was prepared by mixing nano-ferrite. SEM showed that nano-ferrite was well dispersed in coating.The content of nano-ferrite had influence on mechanical properties, electric properties, absorption properties and other properties of UV cured film. The results showed properties of the film with nano-ferrite were better than those of the film without nano-ferrite. For example, it showed that incorporation of nano-ferrite into coating could much enhance hardness and wear resistance of the film. But there was an optimum content of nano-ferrite, high or low which these mechanic performances would reduce. The effects of coating on wave absorption capacities were small when the content of nano-ferrite was 5%. Absorption capacities changed in different frequency ranges. The content of nano-ferrite was 20%, which high 5 times compared with the content of 5%.
|
PDF Full Text Request