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荧光增白剂可吸收不可见的紫外光,并且将紫外光转变为可见的蓝色或蓝紫色光发射出来;由于蓝色和黄色互为补色,消除了物质中的黄色部分,从而达到了增白效果。因此,采用荧光增白剂合成的水性聚氨酯(WPU)增白材料,用于涂料和织物上,可初步解决芳香族WPU的耐黄变问题。研究了乳液pH值、荧光增白剂的用量及其添加方式对WPU增白效果的影响,并通过透射电镜(TEM)观察增白剂在WPU中的分散情况。实验结果表明,WPU乳液及其胶膜的蓝光效果随着荧光增白剂用量的增加呈先增后降的趋势,当w(荧光增白剂)=0.008%时为最佳;当pH=7～9时,荧光增白剂在WPU中的分散稳定性和增白效果都较好;荧光增白剂的两种添加方式对其在WPU乳液及其胶膜中的分散稳定性和增白效果的影响不明显。
Fluorescent whitening agents absorb invisible UV light and emit ultraviolet light into visible blue or blue-violet light; as blue and yellow complement each other, the yellow portion of the material is eliminated, increasing White effect. Therefore, the use of optical brighteners synthetic water-based polyurethane (WPU) whitening materials used in coatings and fabrics, the initial solution to the problem of yellowing aromatic WPU. The effects of pH value of emulsions, dosage of fluorescent whitening agents and their adding methods on the whitening effect of WPU were studied. The distribution of whitening agents in WPU was observed by transmission electron microscopy (TEM). The experimental results showed that the blue light effect of WPU emulsion and its film increased firstly and then decreased with the increase of the amount of fluorescent whitening agent, and was best when w (fluorescent whitening agent) = 0.008% ~ 9, the optical brightener dispersion stability and whitening effect in WPU are better; two kinds of optical brightener added WPU emulsion and its film in the dispersion stability and whitening effect The effect is not obvious.