PA6-56 copolymerized material and preparation method thereof
A technology of copolymerization and caprolactam, which is applied in the field of PA6-56 copolymerization materials and its preparation, can solve the problems of poor wear resistance and acid and alkali resistance, and achieve better performance, rich colors, and strong chemical bonds.
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Embodiment 1
[0028] Liquid caprolactam is mixed with an aqueous solution of 80% pentamethylenediamine adipate by mass fraction, the molar ratio of caprolactam to pentamethylenediamine adipate is 9:1, in the reactor under the condition of 240-250℃ and nitrogen protection After 1 hour of reaction, turn on the vacuum pump to remove the excess water vapor escaping from the reactants, keep the pressure of the reactor system constant at slight negative pressure or normal pressure, generally -0.1MPa-0.1MPa is appropriate, and continue the reaction After 10 hours, a PA6-56 copolymer was obtained. After testing, its relative viscosity is 2.37, and its equilibrium moisture absorption rate is 5.1%.
Embodiment 2
[0030] Mix liquid caprolactam with 80% aqueous solution of adipate pentamethylenediamine salt in a closed reactor, the molar ratio is 8:2, in the closed reactor under the condition of 245-260°C and nitrogen protection Stir continuously, turn on the vacuum pump to remove the water vapor in the reactor after 2 hours of reaction, keep the pressure of -0.1MPa-0.1MPa in the reactor, and obtain a PA6-56 copolymer after 12 hours of reaction, and cool the copolymer by extrusion , granulation, hot water extraction and hot nitrogen drying to obtain PA6-56 copolymer slices, the relative viscosity of this copolymer is 2.4-2.7, and the equilibrium moisture absorption rate is 5.3%.
Embodiment 3
[0032] Mix liquid caprolactam with 80% aqueous solution of pentamethylenediamine adipate in a closed reactor, the molar ratio is 8:2, and the total mass ratio of caprolactam and pentamethylene adipate at the same time is 0.3 % of terephthalic acid, kept stirring in a closed reactor at 245-260°C under the protection of nitrogen, after 2 hours of reaction, turn on the vacuum pump to remove the water vapor in the reactor, and keep the reactor at -0.1MPa-0.1 The pressure of MPa, after reacting for 12 hours, the PA6-56 copolymer was obtained. After the copolymer was extruded and cooled, pelletized, hot water extracted and dried with hot nitrogen, the PA6-56 copolymer chip was obtained. The relative viscosity of the copolymer was 2.4-2.7, the equilibrium moisture absorption rate is 5.3%.
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