Construction of crystallization nucleation and network crosslinking structure in bamboo scrap/magnesium oxychloride composites via nano-SiO2

The problem of utilizing substantial bamboo residual waste while also improving the quality of building composites was addressed by preparing bamboo scrap/magnesium oxychloride composites using bamboo scraps as a reinforcing material and magnesium oxychloride as a matrix. However, problems remain, such as poor interface compatibility and poor water resistance, which limit its application range. Herein, nano-silica (nSiO2) was found to build a crystal nucleus and a network structure in the composites, such that the bamboo scrap/magnesium oxychloride composites had higher mechanical properties and water resistance. In addition, the nSiO2 crystal nucleus structure promoted the composites hydration process, promoted the growth of the 5-phase crystals and the close arrangement of the cross, thereby improved composites strength. The nSiO2 build a network structure at composites interface, which improved the compatibility of composites interfaces, thus improving water resistance. At the same time, nSiO2 and the crystal nuclei adsorbed a portion of CO2 and CO, which had a certain hindering effect on the release of toxic gases in fire, and provided new ideas for fire safety protection. These results expanded the scope of application of building composites, which can be used in the fields of fireproof materials and building decoration materials, and provided a good solution for bamboo processing waste, thus making a certain contribution to green environmental protection.