Foamed magnesite cement is different from ordinary magnesite cement. The bulk density is generally controlled at 500kg/m. Below, some products such as fire door core panels require lower bulk density, generally controlled at 250~340kg/m; Therefore, the requirements for foaming agents for foamed magnesite cement are relatively high. There are many types of blowing agents on the market, and the quality is uneven, which leads producers to be overwhelmed by the choice of blowing agents. A brief description of the selection of blowing agents in foamed magnesite cement is now given.
Fully understand the type of foaming agent: different types of foaming agents have different foaming power, foam stability is not the same, so there are certain limitations in the use process. For example, the foam stability and foaming ratio of the rosin-based foaming agent are not so good, so it can only be used for foamed magnesite cement with a capacity greater than 600 kg/m; but not for 500 kg/m3; The following low-density foamed magnesite cement; anionic synthetic surfactant foaming agent has fast foaming and large foaming capacity, but poor foam stability, and low density (500kg/m or less) foamed magnesite products are difficult to produce. Protein foaming agent has relatively good foaming power and foam stability, but the viscosity of the foam is large, which is not conducive to mechanized production; composite foaming agent has good foaming power and foam stability, but foaming agent The specific technical indicators are also different.
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