Paper wet strength raising composition containing water soluble capped carbamate prepolymer
A technology of urethane and blocked isocyanate, which is applied in the direction of reinforcing agent addition, papermaking, paper, etc.
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example 1
[0034] 300 parts of polyether polyol with an average molecular weight of 3000 and 50.4 parts of hexamethylene diisocyanate (HMDI) were prepared by randomly adding 70:30 ethylene oxide (EO) and propylene oxide (PO) to glycerin Reaction at 100° C. for 150 minutes yielded a urethane prepolymer with a free isocyanate content of 4%. The reaction product was cooled to 70°C, and 8.9 parts of N,N-dimethylethanolamine was added thereto. The mixture was kept under stirring at 70° C. for 100 minutes, whereupon the free isocyanate content fell to 2.5%. The reaction product was further cooled to 50°C, and 29.5 parts of p-hydroxybenzoic acid were added thereto. After the addition, the mixture was reacted at an internal temperature of 70° C. for 120 minutes.
[0035] After confirming that there is no free isocyanate, the reaction product was quaternized with 12.6 parts of dimethylsulfate at 55°C for 30 minutes, then mixed with 12.6 parts of dodecyltriethylammonium ethoxysulfate, followed b...
example 2
[0036] 300 parts of a polyether polyol having an average molecular weight of 3000, prepared by adding 70:30 reactive EO and PO to glycerin, and 100 parts of hydroxyl terminated polyhexene adipate (MW=1000) were mixed. This mixture was reacted with 67.2 parts of HMDI at 100°C for 2 hours to yield a urethane prepolymer with a free isocyanate content of 3%. The reaction product was cooled to 70°C, and 8.9 parts of N,N-dimethylethanolamine was added. The mixture was stirred at 70°C for 100 minutes, and the free isocyanate content dropped to 1.8%. The reaction mixture was further cooled to 50°C and 41.5 parts of butylparaben were added. Then, the mixture was reacted at an internal temperature of 70° C. for 120 minutes.
[0037] After confirming the absence of free isocyanate, the reaction product was quaternized with 15.4 parts of diethylsulfate at 55°C for 30 minutes, then mixed with 43 parts of dodecyltriethylammonium ethoxysulfate, and then mixed with 1690 parts of Dilute wit...
example 3
[0038] 300 parts of a polyether polyol (MW=3000) prepared by adding reactive EO and PO in trimethylolpropane in a ratio of 10:90 (MW=3000), and 50.4 parts of HMDI were reacted at 100°C for 2 hours to produce a free isocyanate content 4% urethane prepolymer. The reaction product was cooled to 70°C, and 8.9 parts of N,N-dimethylethanolamine was added. The mixture was reacted with stirring at 70° C. for 100 minutes, whereupon the free isocyanate content fell to 1.2%. The reaction mixture was further cooled to 50°C, and 15 parts of p-hydroxybenzoic acid were added. The internal temperature rose to 70°C and the reaction was continued for 120 minutes. After confirming the absence of free isocyanate, the reaction product was reacted with 15.4 parts of diethylsulfate at 55° C. for 30 minutes, and then mixed with 39 parts of dicyanodiamide-divinyltriamine-formaldehyde polycondensate (MW=5000) , and then diluted with 1520 parts of water. A clear, viscous, 20% solids solution of the ...
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