Aqueous polyamide as well as preparation method and application thereof
A technology of polyamide and copolymerized polyamide, which is applied in the field of polyamide resin, can solve the problems of poor compatibility between sizing agent and matrix resin, affecting the mechanical properties of composite materials, and destroying the interfacial phase of composite materials, so as to achieve low cost of raw materials and low cost of equipment. Low requirements, the effect of improving the interface bonding strength
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Embodiment 1
[0049] Put 20 g of malic acid, 80 g of adipic acid, and 62.7 g of decanediamine into a vacuum oven, and dry at 60° C. for 12 hours. Put the dried raw materials into a three-necked flask, add 150mL N,N-dimethylformamide and 50mL N-methylpyrrolidone into the flask as a solvent, prepolymerize at 80°C for 1 hour, raise the temperature to 110°C, add 12mL of triphenyl phosphite, then add 20g of ethylenediamine weighed into 30mL of pyridine, add the mixture dropwise into a three-necked flask, react for 0.5 hours, raise the temperature to 125°C, react for 2 hours, cool and filter , washed with methanol, filtered two to three times and dried.
[0050] Put the above product into a flask containing 800mL of N,N-dimethylformamide, add 7.3g of maleic anhydride and 3g of 4-dimethylaminopyridine, stir and heat to 60°C and react for 2 hours, then add precipitant butanone And filtered, washed several times to obtain carboxylated water-based polyamide resin.
[0051] 1. Dissolution performanc...
Embodiment 2
[0058] Put 50 g of malic acid, 50 g of terephthalic acid, and 39.6 g of hexamethylenediamine into a vacuum oven, and dry at 60° C. for 12 hours. Put the dried raw material into a three-necked flask, add 150mL N,N-dimethylformamide and 50mL N-methylpyrrolidone into the flask as a solvent, prepolymerize at 70°C for 2 hours, raise the temperature to 110°C, add 12mL of triphenyl phosphite, then add 20g of ethylenediamine weighed into 30mL of imidazole, drop the mixture into a three-necked flask, react for 0.5 hours, raise the temperature to 135°C, react for 2 hours, cool and filter , washed with methanol, filtered two to three times and dried.
[0059] Put the above product into a flask containing 600mL of N,N-dimethylformamide, add 22.1g of phthalic anhydride and 3g of pyridine, stir and heat to 60°C, react for 2 hours, add precipitant butanone and filter , Wash several times to obtain carboxylated water-based polyamide resin.
[0060] 1. Dissolution performance test:
[0061]...
Embodiment 3
[0067] Put 20 g of malic acid, 60 g of glutaric acid, and 39 g of 1,7-heptanediamine into a vacuum oven, and dry at 60° C. for 12 hours. Put the dried raw materials into a three-necked flask, add 150mL N,N-dimethylformamide and 50mL N-methylpyrrolidone into the flask as a solvent, prepolymerize at 80°C for 1 hour, raise the temperature to 110°C, add 12mL of phenylphosphinic acid, then add 31g of diethylenetriamine weighed into 30mL of pyridine, add the mixture dropwise into a three-necked flask, react for 0.5 hours, raise the temperature to 125°C, react for 2 hours, cool, Filter, wash with methanol, filter two or three times and dry.
[0068] Put the above product into a flask containing 800mL of N,N-dimethylformamide, add 8g of maleic anhydride and 3g of 4-dimethylaminopyridine, stir and heat to 60°C and react for 2 hours, add a precipitating agent butanone and Filter and wash several times to obtain carboxylated water-based polyamide resin.
[0069] 1. Dissolution performa...
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