A kind of preparation method of dope dyeing para-aramid filament and product thereof
A para-aramid fiber and dope coloring technology, which is applied in the direction of adding pigments to single-component polyamide artificial filaments and spinning solutions, can solve problems such as undesired color fastness, and achieve good physical and mechanical properties, good The effect of physical performance indicators
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Embodiment 1
[0027] Such as figure 1 Shown, a kind of preparation method of dope coloring para-aramid filament comprises the steps:
[0028] (1) After drying the carbon black to make the moisture content below 1%, add CaCl with a concentration of 6.0% 2 The N-methylpyrrolidone is ground and emulsified by a high-shear emulsifier, and the maximum diameter of the colorant after grinding and emulsification is ≤5um; the water content of the polymerization solvent is lower than 300ppm.
[0029] (2) Add p-phenylenediamine, lower the reaction system to -3°C, add 30% of the total mass of terephthaloyl chloride to carry out prepolymerization reaction, the reaction time is 20mins, then lower the reaction system to -3°C, and then Add 70% of the total mass of terephthaloyl chloride to carry out polycondensation reaction, and the reaction time is 20mins to obtain a black para-aramid polymer;
[0030] Wherein, the content of the carbon black in the polymer is 3.5%; the molar ratio of the p-phenylenedia...
Embodiment 2
[0034] Such as figure 1 Shown, a kind of preparation method of dope coloring para-aramid filament comprises the steps:
[0035] (1) After drying the carbon nanotubes to make the moisture content below 1%, add CaCl with a concentration of 4.0% 2 The N-methylpyrrolidone is ground and emulsified by a ball mill, and the maximum diameter of the colorant after grinding and emulsification is ≤5um; the water content of the polymerization solvent is lower than 300ppm.
[0036] (2) Add p-phenylenediamine, lower the reaction system to -4°C, add 30% of the total mass of terephthaloyl chloride to carry out prepolymerization reaction, the reaction time is 15mins, then lower the reaction system to -4°C, and then Add 70% of the total mass of terephthaloyl chloride to carry out polycondensation reaction, and the reaction time is 35mins to obtain a black para-aramid polymer;
[0037] Wherein, the content of the carbon nanotubes in the polymer is 2.5%; the molar ratio of the p-phenylenediamine...
Embodiment 3
[0041] Such as figure 1 Shown, a kind of preparation method of dope coloring para-aramid filament comprises the steps:
[0042] (1) After drying the carbon nanotubes to make the moisture content below 1%, add CaCl with a concentration of 5.5% 2 The N-methylpyrrolidone is ground and emulsified by a high-shear emulsifier, and the maximum diameter of the colorant after grinding and emulsification is ≤5um; the water content of the polymerization solvent is lower than 300ppm.
[0043](2) Add p-phenylenediamine, lower the reaction system to 0°C, add 30% of the total mass of terephthaloyl chloride to carry out prepolymerization reaction, the reaction time is 30mins, then lower the reaction system to 0°C, then add p 70% of the total mass of phthaloyl chloride is polycondensed, and the reaction time is 25mins to obtain a black para-aramid polymer;
[0044] Wherein, the content of the carbon nanotubes in the polymer is 2.0%; the molar ratio of the p-phenylenediamine to the total mass ...
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