Silica-sand-based breathable composite material and preparation method thereof

Abstract

The invention belongs to the technical field of casting materials, and in particular relates to a silica sand-based breathable composite material and a preparation method thereof. The breathable composite material is composed of the following raw materials in parts by weight: 50–70 parts of active silica sand, 75 parts of a ZnO suspension, 8–25 parts of an AgNO3 solution, 10–18 parts of WBPU, and 6–10 parts of a breathability regulator. By means of a synergistic strategy involving surface modification of silica sand particles, in-situ loading of Ag2ZnO, and construction of a WBPU bonding network, the breathable composite material can effectively improve casting forming quality and load-bearing performance. Moreover, the material can be converted for use as a horticultural permeable planting medium, in which water-permeable channels are coupled with a nutrient slow-release network, thereby promoting healthy growth of plant root systems. The material simultaneously exhibits high air permeability, strong antibacterial performance, and excellent mechanical strength.