Spirocyclic alkoxysilane synthesized from rice straw ash for preparation of eco-friendly hydrophobic silicone coatings

Abstract

The purpose of this study was to use biomass silicon resources in rice straw to synthesize high value-added organosilicon products to solve the problem of low utilization of rice straw and high pollution and energy consumption in the silicon chemical industry. In this work, spirocyclic alkoxysilane was successfully synthesized by an environmentally friendly method from rice straw ash for the first time. The spirocyclic alkoxysilane yield per gram of rice straw ash can reach up to 1.9 g. Spirocyclic alkoxysilane was used to modify silicone resin coating. This coating can withstand 150 applications of friction and still maintain good hydrophobic effect. The maximum water contact angle after friction can reach 104°. This study broadens the application of rice straw. Furthermore, this research lays the foundation for the improvement of energy-saving and emission reduction process of silicon chemical industry.

Fluorine-free and durable hydrophobic coating made with corn straw-derived silane modified epoxy resin

“…The main reason for the above fact is that too much spirocyclic alkoxysilane was agglomerated in the epoxy resin film layer, which led to more defects and degraded the adhesion of the film. But the adhesion of the spirocyclic alkoxysilane modified epoxy resin film was significantly better than that of the resin film previously reported in the literature (Liu et al 2022).…”

“…When the doping ratio of spirocyclic alkoxysilane was 30%, the WCA of the modified epoxy resin reaches its maximum value. This value was higher than the WCA of resin film previously reported in the literature (Liu et al 2022). The possible reasons why the WCA of the modified epoxy resin was noticeably higher are as follows: Firstly, spirocyclic alkoxysilane contains 6 methyl groups per molecule.…”

“…8, it can be seen that the WCA of epoxy resin modified by 20% and 30% doping of spirocyclic alkoxysilane decreased remarkably less than other groups; those specimens were able to withstand more than 1600 applications of friction. This value is significantly better than the applications of friction of resin coating previously reported in the literature (Liu et al 2022). Furthermore, the epoxy resin modified by 30% doping of spirocyclic alkoxysilane was able to reach the maximum WCA at more than 110° after 1200 applications of friction.…”

“…Hydrophobic materials have become a popular research topic in recent years because of their promising applications in self-cleaning (Ganesh et al 2011), anti-fogging (Lai et al 2012), hydrophobic (Liu et al 2022), and anti-fingerprint (An et al 2018) applications. The static water contact angle (WCA) of hydrophobic surfaces is greater than 90°.…”

Preparation and performance of self‐healing nanocomposite coating with hydrophobic self‐cleaning ability

“…[18][19][20] The application of self-healing on hydrophobic coatings responds to the national requirement of energy saving and emission reduction, promotes the development of the industry, and also promotes the use of resources and reduces waste. 21 However, most of the hydrophobic self-healing coatings prepared so far are externally supported self-healing materials, which have shortcomings such as low healing times, high healing condition requirements, complex manufacturing processes, and environmental pollution. [22][23][24][25] Therefore, a simple method to prepare environmentally friendly self-healing materials that can heal infinitely and under easy-to-achieve healing conditions can further investigate the healing mechanism of coatings and provide a theoretical basis for technological innovation of coatings.…”