Nylon 6 and two-stage polymerization preparation method thereof
A technique of nylon and polymerization reaction, which is applied in the manufacture of rayon, single-component polyamide rayon, and fiber chemical characteristics. It can solve the problems of difficult product quality, operation economy, and complicated preparation process. The concentration of the catalyst can be achieved. Recycling, high reaction efficiency, good anti-aging performance
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Embodiment 1
[0021] Add 10mol caprolactam, 1mol iron oxide, 0.1mol N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,3-naphthalene dicarboxamide into the reactor, React at 121kPa, 260°C for 10h; then transfer the material to the second reactor, and then react at 101kPa, 180°C for 2h. After the reaction, nylon 6 with a relative viscosity of 4.2 is obtained.
[0022] Among them, the preparation method of N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,3-naphthalene dicarboxamide is as follows: 0.2mol 2,2,6, Add 6-tetramethyl-4-piperidone and 0.1mol 2,7-naphthalene dicarboxylic acid into 20mL of chloroform, then transfer to the reactor, heat and reflux at 61°C for 10h; after the heating and reflux reaction, add 20mL of toluene and 5g of sodium hydroxide were stirred evenly, the organic phase was separated, and after the organic phase was washed and filtered, the stabilizer was obtained, and its structural formula was as follows:
[0023]
Embodiment 2
[0025] Add 15mol caprolactam, 0.5mol iron oxide, 0.3mol N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,3-naphthalene dicarboxamide into the reactor , react at 121kPa, 260°C for 10h; then transfer the material to the second reactor, and then react at 101kPa, 180°C for 2h. After the reaction, nylon 6 with a relative viscosity of 4.4 is obtained.
[0026] Among them, the preparation method of N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,3-naphthalene dicarboxamide is as follows: 0.2mol 2,2,6, Add 6-tetramethyl-4-piperidone and 0.1mol 2,7-naphthalene dicarboxylic acid into 20mL of chloroform, then transfer to the reactor, heat and reflux at 61°C for 10h; after the heating and reflux reaction, add Stir 20mL of toluene and 5g of sodium hydroxide evenly, separate the organic phase, wash and filter the organic phase to obtain the stabilizer.
Embodiment 3
[0028] Add 20mol caprolactam, 0.7mol iron oxide, 0.2mol N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,3-naphthalene dicarboxamide into the reactor , react at 121kPa, 260°C for 10h; then transfer the material to the second reactor, then react at 101kPa, 180°C for 2h, after the reaction, nylon 6 with a relative viscosity of 4.5 is obtained.
[0029] Among them, the preparation method of N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,3-naphthalene dicarboxamide is as follows: 0.2mol 2,2,6, Add 6-tetramethyl-4-piperidone and 0.1mol 2,7-naphthalene dicarboxylic acid into 20mL of chloroform, then transfer to the reactor, heat and reflux at 61°C for 10h; after the heating and reflux reaction, add Stir 20mL of toluene and 5g of sodium hydroxide evenly, separate the organic phase, wash and filter the organic phase to obtain the stabilizer.
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