A curing agent for reducing the volatile content of adhesives
A technology of curing agent and volatile matter, applied in the field of preparation of high tensile shear strength and low volatile content adhesive, can solve the problems of high volatile content, reducing volatile content of adhesive, low tensile shear strength of adhesive, etc. Low molecular weight, reduced viscosity, and simple and easy-to-operate reaction steps
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Embodiment 1
[0049] S1: Add 30.83 g of methylenebisacrylamide, 100 ml of N,N-dimethylformamide and 100 ml of water into the reaction flask, and stir evenly at room temperature. Bubble with nitrogen for 20 min, and then slowly drop 25.84 g of 1-(2-aminoethyl)piperazine into the above mixed system, raise the temperature to 60° C. and react for 5 d. After the reaction was completed, it was cooled, purified, and dried under vacuum at 30 °C for 48 h to obtain hyperbranched polyamidoamine. figure 1 Its infrared spectrum; attached figure 2 Its NMR spectrum; attached image 3 Its carbon NMR spectrum; attached Figure 4 its mass spectrum.
[0050] S2: add 3.0g of paraformaldehyde, 10.3g of diethylenetriamine, 0.2g of hyperbranched polyamidoamine successively in the reaction flask, heat up to 105°C and react for 1h with stirring, titrate 30.0g of cardanol, drop after about 30min, keep the temperature constant Continue to react for 1h and end, remove water by cooling, and place it in a closed en...
Embodiment 2
[0053] S1: Add 24.67 g of methylenebisacrylamide, 100 ml of N,N-dimethylformamide and 105 ml of water into the reaction flask, and stir evenly at room temperature. Bubbling with nitrogen for 30min, then slowly adding 25.84g 1-(2-aminoethyl)piperazine dropwise to the above mixed system, raising the temperature to 58°C and reacting for 6d. After the reaction was completed, it was cooled, purified, and dried under vacuum at 35° C. for 48 hours to obtain hyperbranched polyamidoamine.
[0054] S2: add 5.0g paraformaldehyde, 8g triethylenetetramine, 0.4g hyperbranched polyamidoamine successively in the reaction flask, heat up to 100 DEG C and after stirring and reacting for 1h, titrate 25.0g cardanol, drop about 30min, the constant temperature continues The reaction was completed after 1 h, cooled to remove water, and placed in a closed environment with constant temperature and humidity (temperature 27° C., humidity 43%) for standby use, that is, an amine curing agent modified by hy...
Embodiment 3
[0057] S1: Add 30.83 g of methylenebisacrylamide, 100 ml of N,N-dimethylformamide and 110 ml of water into the reaction flask, and stir evenly at room temperature. Bubble with nitrogen for 25 min, then slowly drop 20.67 g of 1-(2-aminoethyl)piperazine into the above mixed system, raise the temperature to 62° C. and react for 5 d. After the reaction, it was cooled, purified, and dried under vacuum at 30° C. for 48 hours to obtain hyperbranched polyamidoamine.
[0058] S2: add 2.0g of paraformaldehyde, 12g of diethylenetriamine, and 0.1g of hyperbranched polyamidoamine in sequence to the reaction flask, heat up to 110°C and react for 1.5h with stirring, titrate 32.0g of cardanol, drop after about 30min, and keep the temperature constant. Continue to react for 1 hour and finish, cool, remove water, and place in a closed environment with constant temperature and humidity (temperature 23° C., humidity 36%) for use, which is an amine curing agent modified by hyperbranched polyamidoa...
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