The invention provides a polyvinyl chloride building formwork, which is composed of three layers, including an upper and lower surface layer and an intermediate layer, extruded in one step by three-layer co-extrusion. The surface layer is made of the following raw materials: recycled polyvinyl chloride plastic powder, recycled rubber powder, HF-90A foaming regulator, HF-601 lubricant, AP lubricant, impact modifier, reinforcing agent, fly ash filler and stabilizer. The intermediate layer is made of the following raw materials: recycled polyvinyl chloride plastic powder, recycled rubber powder, HF-90A foaming regulator, HF-601 lubricant, AP lubricant, NC white foaming agent, AC yellow foaming agent, impact modifier, reinforcing agent, fly ash filler and stabilizer. The invention adopts a three-layer composite structure, in which the upper and lower surface layers form non-foamed polyvinyl chloride plastic, and the intermediate layer forms low-foamed polyvinyl chloride plastic. Based on the I-steel structure principle, the impact resistance of the formwork is greatly improved.

Area Code: CN

Application Number: CN201710281297.7