Method for preparing melt spun chlorine-resistance high resilient polyurethane fiber

Abstract

The invention discloses a method for preparing melt spun chlorine-resistance high resilient polyurethane fiber, comprising the following steps: 1) a thermoplastic polyurethane slice is prepared by a one-step method; 2) the slice is uniformly mixed with chlorine-resistance cross-linking agent; 3) melt extrusion is carried out; 4) spinning moulding is carried out; and 5) post curing is carried out. By utilizing the invention, the requirement on higher chlorine resistance and resilience in special fields is met, combination of the chlorine-resistance cross-linking agent and polyurethane fiber is good, and the physical performance of fiber can be effectively maintained when being used in a chlorine-containing environment; and besides, diamine is adopted as chain extension agent, the hard section of the formed polyurethane urea has higher cohesive energy, three-dimensional hydrogen bonds can be formed, and the microphase separation degree is improved, thus improving the resilience of fiber.

Description

technical field

[0001] The invention relates to a modified manufacturing technology of melt-spun spandex fibers, which belongs to the field of chemical fiber modification, and specifically relates to a method for preparing melt-spun chlorine-resistant high-resilience spandex fibers. Background technique

[0002] Melt-spun spandex technology has the advantages of simple process flow, low equipment investment, high production efficiency, and environmental protection. In recent years, there has been a boom in investment worldwide. Melt-spun spandex fibers are made by fully mixing thermoplastic polyurethane chips, additives, and cross-linking agents, and extruding them through a screw machine.

[0003] The spandex fiber prepared by the above method has a low differentiation rate, especially poor in chlorine resistance and resilience, and cannot meet the needs of some fields with high chlorine resistance and resilience. Therefore, it is necessary to develop a new type of melt-sp...

Examples

Embodiment 1

[0022] Heat 4000 g of polycaprolactone diol to 85 °C to melt it, under the protection of nitrogen, add the melted polycaprolactone diol to the reaction kettle, turn off the nitrogen, vacuumize to -0.09 MPa, and keep at 85 °C, Degassing for 2 hours; heat 240 g of MDI to 50 °C to melt it, under the protection of nitrogen, add the melted MDI to the reactor, turn off the nitrogen, vacuumize to -0.09 MPa, keep at 50 °C, and defoam for 2 hours; Under the protection of nitrogen, the pretreated polycaprolactone diol and MDI were pre-reacted at 120 °C for 30 seconds, and then 40 g of ethylenediamine, 8 g of antioxidant Tinuvin622 and 20 g of Talc powder, control the reaction temperature at 170 °C to prepare thermoplastic polyurethane slices, and then mix it evenly with 280 g of chlorine-resistant crosslinking agent, then melt spinning, place the silk cake in an oven at 80 °C, and mature for 72 hours Get the product.

Embodiment 2

[0024] Heat 4000 g of polycaprolactone diol to 80 °C to melt it. Under the protection of helium, add the melted polycaprolactone diol to the reaction kettle, turn off the helium, vacuumize to -0.09 MPa, and keep at 80 ℃, degassing for 3 hours; heat 320 g MDI to 50 ℃ to make it melt, under the protection of helium, put the melted MDI into the reaction kettle, turn off the helium, evacuate to -0.09 MPa, keep at 50 ℃, degas Soak for 3 hours; under the protection of helium, pre-react the pretreated polycaprolactone diol with MDI at 130 ° C for 30 seconds, and then add 30 g of ethylenediamine and 10 g of propylene glycol to the middle of the twin-screw extruder at the same time Amine, 12 g of antioxidant Tinuvin622 and 20 g of titanium dioxide were controlled at a reaction temperature of 180 °C to prepare thermoplastic polyurethane slices, which were uniformly mixed with 320 g of chlorine-resistant cross-linking agent, and the silk cake was placed in the The temperature is in an ov...

Embodiment 3

[0026] Heat 4000 g of polycaprolactone diol to 90 °C to melt it. Under the protection of argon, add the melted polycaprolactone diol to the reaction kettle, close the argon, vacuumize to -0.09 MPa, and keep 90 ℃, degassing for 3 hours; heat 280 g MDI to 45 ℃ to melt, under the protection of argon, put the melted MDI into the reaction kettle, turn off the argon, evacuate to -0.09 MPa, keep at 45 ℃, degas Soak for 3 hours; under argon protection, pre-react the pretreated polycaprolactone diol with MDI at 135 °C for 35 seconds, then add 30 g of propylenediamine and 30 g of pentadiene to the middle of the twin-screw extruder at the same time Amine, 7 g of antioxidant Tinuvin622 and 24 g of titanium dioxide were controlled at a reaction temperature of 185 °C to prepare thermoplastic polyurethane slices, which were uniformly mixed with 300 g of chlorine-resistant cross-linking agent, and the silk cake was placed in the The temperature is 100 ℃ in the oven, aging for 60 hours to obta...

technical field

[0001] The invention relates to a modified manufacturing technology of melt-spun spandex fibers, which belongs to the field of chemical fiber modification, and specifically relates to a method for preparing melt-spun chlorine-resistant high-resilience spandex fibers. Background technique

[0002] Melt-spun spandex technology has the advantages of simple process flow, low equipment investment, high production efficiency, and environmental protection. In recent years, there has been a boom in investment worldwide. Melt-spun spandex fibers are made by fully mixing thermoplastic polyurethane chips, additives, and cross-linking agents, and extruding them through a screw machine.

[0003] The spandex fiber prepared by the above method has a low differentiation rate, especially poor in chlorine resistance and resilience, and cannot meet the needs of some fields with high chlorine resistance and resilience. Therefore, it is necessary to develop a new type of melt-sp...

Examples

Embodiment 1

[0022] Heat 4000 g of polycaprolactone diol to 85 °C to melt it, under the protection of nitrogen, add the melted polycaprolactone diol to the reaction kettle, turn off the nitrogen, vacuumize to -0.09 MPa, and keep at 85 °C, Degassing for 2 hours; heat 240 g of MDI to 50 °C to melt it, under the protection of nitrogen, add the melted MDI to the reactor, turn off the nitrogen, vacuumize to -0.09 MPa, keep at 50 °C, and defoam for 2 hours; Under the protection of nitrogen, the pretreated polycaprolactone diol and MDI were pre-reacted at 120 °C for 30 seconds, and then 40 g of ethylenediamine, 8 g of antioxidant Tinuvin622 and 20 g of Talc powder, control the reaction temperature at 170 °C to prepare thermoplastic polyurethane slices, and then mix it evenly with 280 g of chlorine-resistant crosslinking agent, then melt spinning, place the silk cake in an oven at 80 °C, and mature for 72 hours Get the product.

Embodiment 2

[0024] Heat 4000 g of polycaprolactone diol to 80 °C to melt it. Under the protection of helium, add the melted polycaprolactone diol to the reaction kettle, turn off the helium, vacuumize to -0.09 MPa, and keep at 80 ℃, degassing for 3 hours; heat 320 g MDI to 50 ℃ to make it melt, under the protection of helium, put the melted MDI into the reaction kettle, turn off the helium, evacuate to -0.09 MPa, keep at 50 ℃, degas Soak for 3 hours; under the protection of helium, pre-react the pretreated polycaprolactone diol with MDI at 130 ° C for 30 seconds, and then add 30 g of ethylenediamine and 10 g of propylene glycol to the middle of the twin-screw extruder at the same time Amine, 12 g of antioxidant Tinuvin622 and 20 g of titanium dioxide were controlled at a reaction temperature of 180 °C to prepare thermoplastic polyurethane slices, which were uniformly mixed with 320 g of chlorine-resistant cross-linking agent, and the silk cake was placed in the The temperature is in an ov...

Embodiment 3

[0026] Heat 4000 g of polycaprolactone diol to 90 °C to melt it. Under the protection of argon, add the melted polycaprolactone diol to the reaction kettle, close the argon, vacuumize to -0.09 MPa, and keep 90 ℃, degassing for 3 hours; heat 280 g MDI to 45 ℃ to melt, under the protection of argon, put the melted MDI into the reaction kettle, turn off the argon, evacuate to -0.09 MPa, keep at 45 ℃, degas Soak for 3 hours; under argon protection, pre-react the pretreated polycaprolactone diol with MDI at 135 °C for 35 seconds, then add 30 g of propylenediamine and 30 g of pentadiene to the middle of the twin-screw extruder at the same time Amine, 7 g of antioxidant Tinuvin622 and 24 g of titanium dioxide were controlled at a reaction temperature of 185 °C to prepare thermoplastic polyurethane slices, which were uniformly mixed with 300 g of chlorine-resistant cross-linking agent, and the silk cake was placed in the The temperature is 100 ℃ in the oven, aging for 60 hours to obta...