Forming agent for composite air duct surface material and preparation process thereof

The invention discloses a forming agent for a composite air duct surface material, which is prepared by the following raw materials according to mass ratios: magnesium chloride solution : magnesium oxide : heavy calcium carbonate (purchased from Jiande Oude Calcium Industry Co., Ltd.) : phosphoric acid : foaming agent solution = (100-120) : (90-110) : (45-55) : (0.1-0.2) : (0.2-0.3). The invention also discloses a preparation process of the forming agent. The forming agent has the advantages of lower production cost, less process pollution, anti-rusting, corrosion resistance, anti-aging, light weight, little noise pollution, long service life of above 20 years, and remarkable social benefit.