Process for producing water-soluble closed isocyanic ester monomer
A technology of blocking isocyanate and isocyanate, which is applied in the field of isocyanate monomer, can solve the problems of moisture sensitivity and high reactivity, and achieve the effect of prolonging the service life, prolonging the storage period and improving the bonding effect
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Embodiment 1
[0018] 18g sodium bisulfite is dissolved in 54g water and obtains the sodium bisulfite solution that mass fraction is 25%, and this sodium bisulfite aqueous solution mixes with 3g isopropanol to obtain blocking agent aqueous solution; 13.7g toluene diisocyanate (TDI) dissolves in A homogeneous solution with a mass fraction of TDI of 77.4% was obtained in 4 g of ethyl acetate. Under the condition of stirring at 5°C, this homogeneous solution was added dropwise to the mixture obtained by mixing sodium bisulfite aqueous solution and isopropanol according to the molar ratio of isocyanate group and blocking agent sodium bisulfite at a ratio of 1:1.1. React in the blocking agent aqueous solution for 2 hours to obtain the water-soluble blocked isocyanate monomer.
Embodiment 2
[0020] Dissolve 19g of sodium bisulfite in 50g of water to obtain a sodium bisulfite solution with a mass fraction of 27.5%. This aqueous solution of sodium bisulfite is mixed with 4g of ethanol to obtain an aqueous solution of capping agent; 19g of diphenylmethane-4,4'-bis Isocyanate (MDI) was dissolved in 4 g of butanone solvent to obtain a homogeneous solution with a mass fraction of MDI of 82.6%. Under the condition of stirring at 20°C, this homogeneous solution was added dropwise to the capping solution obtained by mixing the sodium bisulfite aqueous solution and ethanol according to the molar ratio of the isocyanate group and the capping agent sodium bisulfite as 1:1.2. Reaction in aqueous solution for 2 hours to obtain water-soluble blocked isocyanate monomer.
Embodiment 3
[0022] 20g sodium bisulfite was dissolved in 46.7g water to obtain a mass fraction of 30% sodium bisulfite solution, and this sodium bisulfite aqueous solution was mixed with 5g ethanol to obtain an aqueous blocking agent solution; 17.8g isophorone diisocyanate (IPDI) Dissolved in 5 g butanone solvent to obtain a homogeneous solution with a mass fraction of IPDI of 78.1%. Under the condition of stirring at 10°C, this homogeneous solution was added dropwise to the capping solution obtained by mixing the sodium bisulfite aqueous solution and ethanol according to the ratio of the molar ratio of the isocyanate group to the capping agent sodium bisulfite being 1:1.2. Reaction in aqueous solution for 2 hours to obtain water-soluble blocked isocyanate monomer.
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