A kind of preparation method of branched polyamide polyamine-acrylamide copolymer paper dry strength agent
A technology of acrylamide copolymer and polyamide polyamine, which is applied in the directions of paper, reinforcing agent addition, paper making, etc., can solve the problems of retention, influence on product application effect, influence enhancement, etc., and achieve strong bridging ability and excellent reinforcement effect. , the effect of high degree of branching
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Embodiment 1
[0026] (1) In the four-necked flask equipped with electric stirrer, thermometer, moisture separator and condenser, add 46.43g (0.45mol) diethylenetriamine, add 73.07g (0.5mol) adipic acid in several times under stirring , the temperature rise reaction, when the temperature rises to 130 ℃, the condenser has water to distill, continue to heat to 150 ℃ and keep the reaction at this temperature for 5 hours, cool, add a certain amount to the reactant when the temperature of the reaction solution drops to 100 ℃ and continue stirring until the reactants are homogeneous to obtain a yellow transparent viscous prepolymer polyamide polyamine (PPC) with a solid content of about 40%, and its viscosity measured by a Brookfield viscometer is 340 centipoise.
[0027] (2) To the above prepolymer solution, add 3.55g (0.023mol) N,N'-methylenebisacrylamide, and react at 30°C for 10 hours to obtain a modified polyamide polyamine prepolymer. The viscosity was measured to be 400 centipoise on a Broo...
Embodiment 2
[0030] (1) In a four-necked flask equipped with an electric stirrer, a thermometer, a moisture separator and a condenser, 56.74g (0.55mol) of diethylenetriamine was added, and 73.07g (0.5mol) of adipic acid was added several times under stirring , the temperature rise reaction, when the temperature rises to 130 ℃, the condenser has water to distill, continue to heat to 190 ℃ and keep the reaction at this temperature for 2 hours, cool, add a certain amount to the reactant when the temperature of the reaction solution drops to 100 ℃ and continue stirring until the reactants are homogeneous to obtain a yellow transparent viscous prepolymer polyamide polyamine (PPC) with a solid content of about 50%, and its viscosity measured by a Brookfield viscometer is 420 centipoise.
[0031] (2) To the above prepolymer solution, add 8.48g (0.055mol) N,N'-methylenebisacrylamide, and react at 70°C for 1 hour to obtain a modified polyamide polyamine prepolymer. The viscosity was measured to be ...
Embodiment 3
[0034] (1) In a four-necked flask equipped with an electric stirrer, a thermometer, a moisture separator and a condenser, add 77.50g (0.53mol) triethylenetetramine, and add 43.84g (0.3mol) adipic acid several times under stirring With 26.42 (0.2mol) glutaric acid, temperature rise reaction, when temperature rises to 130 ℃, condenser has water to distill out, continue to be heated to 170 ℃ and be incubated at this temperature and react for 4 hours, cooling, treat that the temperature of reaction solution is reduced to 100 Add a certain amount of hot water to the reactant at ℃, and continue to stir until the reactant is homogeneous to obtain a yellow transparent viscous prepolymer polyamide polyamine (PPC) with a solid content of about 55%, using a Brookfield viscometer Its viscosity was measured to be 560 centipoise.
[0035] (2) To the above prepolymer solution, add 6.48g (0.042mol) N,N'-methylenebisacrylamide, and react at 50°C for 5 hours to obtain a modified polyamide polya...
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