Gunes Deniz, Karagoz Bunyamin
Department of Chemistry, Istanbul Technical University, Maslak, 34469 Istanbul, Turkey.
Denge Kimya ve Tekstil San. Tic. A.S, Velimese OSB Mah. 259. Sk. No:4/1, Ergene, 59880 Tekirdag, Turkey.
ACS Omega. 2022 Nov 23;7(48):43877-43882. doi: 10.1021/acsomega.2c05056. eCollection 2022 Dec 6.
Herein, new polyborosiloxanes (PBSs) were prepared using a straightforward synthetic approach to obtain a core-shell structure as a material with various features such as better adhesion ability to the applied surface and enhanced thermal properties. In this concept, in situ core-shell formation was allowed by sequential addition of ingredients with fixed conversions. First, pre-condensed polysiloxane was synthesized, with a 60% conversion, as a core by the reaction of phenyltriethoxysilane in the presence of water in an acidic condition. Subsequent addition of boric acid into the pre-condensate and a further condensation reaction resulted in the formation of the shell layer through the introduction of the -Si-O-B- bonds to the network of the PBS. The resulting resin was used as a binder for heat-resistant paint in combination with an aluminum pigment, and the paint applied on a metal plate was found to be resistant up to 600 °C in terms of adhesion strength. It was also demonstrated that the incorporation of boron in the core-shell structure showed better adhesion strength than the one-pot preparation of PBS. Using this method, not only the heat resistance requirement of the industrial coating was achieved but also the flame-retardant ability was introduced.
在此，通过一种直接的合成方法制备了新型聚硼硅氧烷（PBSs），以获得具有核壳结构的材料，该材料具有多种特性，如对应用表面具有更好的粘附能力和增强的热性能。在此概念中，通过顺序添加具有固定转化率的成分来实现原位核壳形成。首先，在酸性条件下，在水的存在下，通过苯基三乙氧基硅烷的反应合成了转化率为60%的预缩聚聚硅氧烷作为核。随后将硼酸添加到预缩聚物中并进行进一步的缩合反应，通过将-Si-O-B-键引入PBS网络中，形成了壳层。所得树脂与铝颜料结合用作耐热涂料的粘合剂，发现涂覆在金属板上的涂料在附着力方面在高达600℃时仍具有抗性。还表明，在核壳结构中引入硼比一锅法制备的PBS表现出更好的附着力。使用这种方法，不仅满足了工业涂料的耐热性要求，还引入了阻燃能力。
