Pugacheva Tatyana A, Malkov Georgiy V, Ilyin Alexander A, Indeikin Eugene A, Kurbatov Vladimir G
Institute for Problems of Chemical Physics of the Russian Academy of Sciences (IPCP RAS), Academician Semenov Avenue 1, 142432 Chernogolovka, Russia.
Department of Chemical Technology of Organic Coatings, Yaroslavl State Technical University, Moscow Avenue 88, 150023 Yaroslavl, Russia.
Polymers (Basel). 2022 May 13;14(10):2005. doi: 10.3390/polym14102005.
Core/shell pigments allow for the combination of the active anti-corrosion effect of the shell and the barrier effect of the core. This makes it possible to obtain anti-corrosion pigments, with a high-protective effect and low toxicity. Thus, the need for a comprehensive study of the properties of these pigments grows more urgent, before their application to paints and varnishes. The hiding power of core/shell pigments comes close to the one of pure polyaniline (PANi), when the PANi content in the pigment reaches 50 wt.%, with sulfuric and phosphoric acids used as dopants. This paper, also, shows that the blackness value of core/shell pigments with 10 wt.% PANi is around 35 and constant; for pure PANi, their blackness value is 40. When PANi content is 5 wt.%, kaolin-based pigment shows the lowest blackness, which happens due to a generally higher whiteness of kaolin. However, when the PANi content surpasses 10 wt.%, there seems to be no influence on the blackness of the core/shell pigments. The core/shell pigment with a 20 wt.% PANi is, optically, identical to a black-iron-oxide pigment. An increase in the PANi content of the core/shell pigment leads to an increase in the oil absorption of the samples. It was found that the dispersion process would be the most energy efficient for core/shell pigments, containing kaolin and talc as a core.
核/壳型颜料能够将壳层的活性防腐作用与核层的阻隔作用结合起来。这使得获得具有高防护效果和低毒性的防腐颜料成为可能。因此，在将这些颜料应用于油漆和清漆之前，对其性能进行全面研究的需求变得更加迫切。当颜料中聚苯胺（PANi）的含量达到50 wt.%，并使用硫酸和磷酸作为掺杂剂时，核/壳型颜料的遮盖力接近纯聚苯胺（PANi）的遮盖力。本文还表明，聚苯胺含量为10 wt.%的核/壳型颜料的黑度值约为35且恒定；对于纯聚苯胺，其黑度值为40。当聚苯胺含量为5 wt.%时，高岭土基颜料的黑度最低，这是由于高岭土通常具有较高的白度。然而，当聚苯胺含量超过10 wt.%时，似乎对核/壳型颜料的黑度没有影响。聚苯胺含量为20 wt.%的核/壳型颜料在光学上与黑色氧化铁颜料相同。核/壳型颜料中聚苯胺含量的增加会导致样品的吸油量增加。研究发现，对于以高岭土和滑石粉为核的核/壳型颜料，分散过程的能量效率最高。
