High-throughput die for polyamide strand synthesis
A polyamide, strand-based technology for high-volume die applications that can solve costly retooling, reassembly, alignment and adjustment issues
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preparation example Construction
[0055] The preparation of fiber-forming polyamides from diamine-dicarboxylates can be carried out in several ways. The salt can be heated to the reaction temperature (180°C-300°C) in the absence of solvent or diluent under conditions that allow the removal of water formed in the reaction.
[0056] The polyamide polymerization reaction may be subjected to a reduced pressure, eg, equal to 50 to 300 mm of mercury (67 to 400 mbar) absolute, to facilitate substantially complete polymerization. For example, the reaction vessel in which the polyamide is prepared can be evacuated, after which the polymer is allowed to cure.
[0057] In general, no catalyst needs to be added in the polyamide formation process described above. However, certain phosphorous-containing materials can perform a certain degree of catalytic function. Phosphorus-containing materials may include metal phosphonates. The use of additional catalysts can facilitate the production of high molecular weight material...
Embodiment 1a
[0070] Example 1a: Method using a capillary extrusion die with a capillary having a length of about 2.8 times the diameter and a diameter of 4.5 mm
[0071] Nylon 6,6 polymer was prepared and exited as a molten material at a rate of about 58 L / min from an extruder comprising a screw-type extruder that discharged the material into an extrusion chamber comprising a nylon strand A multiple capillary extrusion die through which the material is extruded. The extruder has 10 dies, each with 30 capillaries. Each capillary had a diameter of 4.5 mm, and a land length (ie, the length of the capillary) of 0.5 inches (1.27 cm). The die has a diameter of about 10 cm. Fibers exit each capillary at a rate of about 12 M / min. The fibers that emerged had a diameter of 4.5mm, a temperature of 270°C, and had a total weight percentage of about 0.1% water, which was mainly internal water. The strands were extruded at an angle of about 45° to horizontal and water was sprayed onto the strands as ...
Embodiment 1b
[0073] Example 1b: Method using a capillary extrusion die with a capillary length of about 2.8 times the diameter and a diameter of 6 mm
[0074] Nylon 6,6 polymer was prepared and exited as a molten material at a rate of about 58 L / min from an extruder comprising a screw-type extruder that discharged the material into an extrusion chamber comprising a nylon strand A multiple capillary extrusion die through which the material is extruded. The extruder has 10 dies, each with 30 capillaries. Each capillary has a diameter of 6 mm, and a length of the shaped section of 0.66 inches (1.68 cm). The die has a diameter of about 10 cm. Fibers exit each capillary at a rate of about 6.8 M / min. The fibers that emerged had a diameter of 6mm, a temperature of 270°C, and had a total weight percentage of about 0.1% water, which was mainly internal water. The strands were extruded at an angle of about 45° to horizontal and water was sprayed onto the strands as they came out of the die. The...
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Abstract
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