One-step continuous forming and flexible deformation preparation process and equipment of polyamide 56 filament
A molding process, polyamide technology, applied in the direction of single-component polyamide artificial filament, filament/thread forming, sustainable manufacturing/processing, etc., can solve the problem of high polymerization and spinning stability requirements and cumbersome process steps , poor spinning stability and other issues, to achieve the effect of low cost, low energy consumption and excellent quality
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Embodiment 1
[0060] Pentamethylene diamine and adipic acid are neutralized and salt-formed in water according to the ratio of 1.01:1, the reaction temperature is 40° C., the reaction time is 50 min, and the solution is stirred until completely dissolved to obtain a polyamide 56 salt solution. Under nitrogen protection, the polyamide 56 salt solution was added to the salt solution preparation tank, 0.5% of the auxiliary pentamethylene diamine was added to the salt solution preparation tank, the pH value of the salt solution was adjusted to 7.73, and the mixed salt solution was concentrated;
[0061] The concentrated salt solution was injected into the U-shaped reactor to start the prepolymerization reaction. The temperature was 210°C and the pressure was 1.70MPa for 120 minutes to carry out the prepolymerization reaction. After the prepolymerization reaction, the pressure was quickly decompressed in the flasher. And heat up to 280 ℃, enter the front polymerizer, the temperature is 280 ℃, las...
Embodiment 2
[0066]Pentamethylene diamine and adipic acid are neutralized and salt-formed in water according to the ratio of 1.02:1, the reaction temperature is 50° C., the reaction time is 40 min, and the solution is stirred until completely dissolved to obtain a polyamide 56 salt solution. Under nitrogen protection, the polyamide 56 salt solution was added to the salt solution preparation tank, 2.5% of the matting agent titanium dioxide was added to the salt solution preparation tank, the pH value of the salt solution was adjusted to 7.86, and the mixed salt solution was concentrated;
[0067] The concentrated salt solution was injected into the U-shaped reactor to start the prepolymerization reaction. The temperature was 218°C and the pressure was 1.73MPa for 100 minutes to carry out the prepolymerization reaction. And heat up to 278°C, enter the front polymerizer, the temperature is 278°C, and last for 60min. At this time, the degree of polymerization is close to the finished product, a...
Embodiment 3
[0072] Pentamethylenediamine and adipic acid are neutralized and salt-formed in water according to the ratio of 1.05:1, the reaction temperature is 60° C., the reaction time is 30 min, and the solution is stirred until completely dissolved to obtain an aqueous polyamide 56 salt solution. Under nitrogen protection, the polyamide 56 salt solution was added to the salt solution preparation tank, 6% of the flame retardant TL was added to the salt solution preparation tank, the pH value of the salt solution was adjusted to 7.81, and the mixed salt solution was concentrated;
[0073] The concentrated salt solution was injected into the U-shaped reactor to start the prepolymerization reaction. The temperature was 228°C and the pressure was 1.75MPa for 90min and the prepolymerization reaction was carried out. After the prepolymerization reaction, the pressure was quickly decompressed in the flash vessel. And the temperature is raised to 283°C, and it enters the front polymerizer, the t...
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