Silicate-modified high-toughness and low-heat polymer grouting material for reinforcement

A method for synthesizing a silicate-modified polymer grouting material for reinforcement, comprising steps of:

• (1) sending 2-carboxyethylphenyl hypophosphorous acid and ethylene glycol into a reaction kettle according to a molar ratio of 1:1, performing esterification under catalysis of sulfuric acid or organotin at a temperature in a range of 105-110° C., distilling off water generated from a column overhead, and obtaining 2-carboxyethylphenyl ethylene glycol hypophosphite;
• wherein a reaction equation is as follows:
• (2) heating the 2-carboxyethylphenyl ethylene glycol hypophosphite to a temperature in a range between 10° and 110° C. in a reactor, adopting potassium hydroxide as a catalyst, adding propylene oxide in a molar ratio of 1:1;
• wherein reaction pressure gradually rises in the reactor, but a maximum pressure is kept below a pressure of 2.5 kg, keeping a temperature in the kettle between a range of 100-115° C., is maintaining the pressure for 4 hours after feeding is completed, keeping the temperature in the reactor at about 100° C., processing vacuum pumping to remove un-reacted molecules, and obtaining a phosphorus-containing dihydric alcohol intermediate;
• wherein a reaction equation is as follows:
• (3) heating the reactor to 48° C.-52° C., firstly adding all of TDI (toluene diisocyanate) according to a molar ratio of phosphorus-containing dihydric alcohol intermediate:
• TDI=1:(3-4), and then adding all of the phosphorus-containing dihydric alcohol intermediate at a uniform speed;
• (4) heating the reactor to a temperature in a range of 78° C.-82° C., and then reacting for 1.9 h-2.2 h;
• wherein a reaction equation is as follows:
• (5) removing TDI which is not reacted by a thin film evaporator;
• (6) cooling the reactor to a temperature in a range of 48° C.-52° C., taking out from the reactor and obtaining modified isocyanate containing 4.4 wt. % of P (phosphorus);
• 7.9 wt. % of N (nitrogen and 11.9 wt. % of NCO % (isocyanate) after packaging;
• wherein a structural formula of the modified isocyanate is as follows:
• (7) mixing the modified isocyanate and a silicate-modified aqueous solution according to a mass ratio in a range of 1:(1.25-1.3) to obtain the silicate modified high-toughness and low-heat polymer grouting material for reinforcement;
• wherein components of the silicate-modified aqueous solution comprises:
• liquid sodium silicate, water, and a catalyst;
• wherein the liquid sodium silicate accounts for 90-95% by weight of the silicate-modified aqueous solution;
• the water accounts for 5-8% by weight of the silicate-modified aqueous solution;
• and the catalyst accounts for 0.5-1.5% by weight of the silicate-modified aqueous solution.