Silicate modified polymer foam material for filling and sealing

A method of preparing a silicate modified polymer foam material for filling and sealing, the method comprising steps of:

• (a) preparing 2-carboxyethylphenyl ethylene glycol hypophosphite, which comprises putting 2-carboxyethylphenyl hypophosphorous acid and ethylene glycol with a molar ratio of 1:1 into a reactor, performing an esterification reaction at 105-110° C. under catalysis of sulfuric acid or organotin, and distilling water produced by the esterification reaction from a top of the reactor, so that the 2-carboxyethylphenyl ethylene glycol hypophosphite is obtained;
• (b) obtaining a phosphorus-containing diol intermediate, which comprises heating the 2-carboxyethylphenyl ethylene glycol hypophosphite to 100-110° C. in the reactor, slowly adding propylene oxide into the reactor under a premise of using potassium hydroxide as a catalyst, wherein a molar ratio of the 2-carboxyethylphenyl ethylene glycol hypophosphite to the propylene oxide is 1:1, gradually increasing a pressure in the reactor, wherein a maximum pressure in the reactor is 2.5 kgf/cm2, keeping a temperature in the reactor at 100-115° C., keeping the pressure for 4 h after completing the addition of propylene oxide, keeping the temperature in the reactor at 100° C., and removing unreacted small molecules in vacuum, so that the phosphorus-containing diol intermediate is obtained;
• (c) heating another reactor to 48-52° C., firstly adding toluene diisocyanate (TDI) into the another reactor, and then adding the phosphorus-containing diol intermediate into the another reactor at a constant rate, wherein a molar ratio of the phosphorus-containing diol intermediate to the TDI is in a range of 1:(3-4);
• (d) heating the another reactor to 78-82° C. and reacting for 1.9-2.2 h;
• (e) removing unreacted TDI with a thin film evaporator;
• (f) obtaining prepolymerized isocyanate after cooling the another reactor to 48-52° C., wherein in the prepolymerized isocyanate, a mass percentage of P is 4.4%, a mass percentage of N is 7.9% and a mass percentage of —NCO is 11.9%;
• and
• (g) mixing the prepolymerized isocyanate with a silicate modified aqueous solution according to a mass ratio in a range of 1:(1.2-1.4), thereby obtaining the silicate modified polymer foam material for filling and sealing.