纳米铁氧体UV固化涂料的研究
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摘要
本文选用了油酸和硬脂酸的复合酸,油酸,KH570,十二烷基硫酸钠对纳米铁氧体进行表面改性,研究不同改性剂对铁氧体亲油性的影响,用热分析、红外光谱分析了改性铁氧体的表面基团,并用透过率、磁响应和活化指数比较改性效果。结果表明纳米铁氧体经表面改性后亲油性明显提高,其中油酸和硬脂酸的复合酸改性效果优于其它改性剂。以此复合酸为改性剂,研究了不同工艺条件(改性剂用量、改性温度)对表面改性的影响,确定纳米铁氧体改性的最佳工艺条件。
把经过改性的纳米铁氧体粒子添加到UV固化涂料中,通过扫描电镜观察涂料固化后的行貌,发现经过改性的铁氧体纳米粒子在涂料中分散均匀。
同时研究了纳米铁氧体含量对UV固化涂膜的机械性能,电学性能,吸波性能等其它各项性能的影响。结果表明,合成的纳米复合涂膜性能明显优于未加纳米的涂膜性能,如硬度、耐磨性等涂膜的机械性能均随纳米粒子含量的增加而提高,但纳米粒子含量有一个最佳值,超过或低于这个值,性能都会有不同程度的降低。铁氧体质量分数是5%时涂膜对电磁波吸收强度很少,当质量分数是20%,在某些频率段,涂膜最大吸收峰对应的吸收强度是-14.2dB,提高5倍左右。
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%.
把经过改性的纳米铁氧体粒子添加到UV固化涂料中,通过扫描电镜观察涂料固化后的行貌,发现经过改性的铁氧体纳米粒子在涂料中分散均匀。
同时研究了纳米铁氧体含量对UV固化涂膜的机械性能,电学性能,吸波性能等其它各项性能的影响。结果表明,合成的纳米复合涂膜性能明显优于未加纳米的涂膜性能,如硬度、耐磨性等涂膜的机械性能均随纳米粒子含量的增加而提高,但纳米粒子含量有一个最佳值,超过或低于这个值,性能都会有不同程度的降低。铁氧体质量分数是5%时涂膜对电磁波吸收强度很少,当质量分数是20%,在某些频率段,涂膜最大吸收峰对应的吸收强度是-14.2dB,提高5倍左右。
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%.
引文
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