Method for preparing ultra-fine and uniform acrylamide-based polymer hydrogel filament and use thereof

A method for preparing an acrylamide-based polymer hydrogel filament, comprising:

• preparing a reaction solution of an acrylamide-based polymer under an ice bath condition, and pumping the reaction solution into a polymerization reaction tube by a syringe, wherein the acrylamide-based polymer comprises an acrylic acid-acrylamide copolymer or an acrylamide homopolymer, the reaction solution of the acrylic acid-acrylamide copolymer comprises 0.03 g/mL to 0.05 g/mL of sodium hydroxide, 0.07 g/mL to 0.14 g/mL of acrylic acid, 1.07 g/mL to 2.13 g/mL of acrylamide, 0.0005 g/mL to 0.001 g/mL of an amine crosslinking agent and 0.0009 g/mL to 0.0025 g/mL of an initiator, and the reaction solution of the acrylamide homopolymer comprises 0.03 g/mL to 0.05 g/mL of sodium hydroxide, 1.07 g/mL to 2.13 g/mL of acrylamide, 0.0005 g/mL to 0.001 g/mL of an amine crosslinking agent and 0.0009 g/mL to 0.0025 g/mL of an initiator, wherein the polymerization reaction tube has a length of 50 cm to 100 cm;
• parabolically bending the polymerization reaction tube with two ends upward;
• suspending the parabolically bent polymerization reaction tube in a constant-temperature drying oven at a temperature of 40° C. to 60° C. for 2 h to 8 h for baking reaction so that components in the reaction solution are fully cross-linked to obtain an acrylic acid-acrylamide copolymer hydrogel or an acrylamide homopolymer hydrogel;
• vacuum drying the polymerization reaction tube containing the acrylic acid-acrylamide copolymer hydrogel or the acrylamide homopolymer hydrogel in a vacuum drying oven at a temperature of 40° C. to 60° C. for 4 h to 8 h so that water in the acrylic acid-acrylamide copolymer hydrogel or the acrylamide homopolymer hydrogel sublimes to obtain a dry filament of the acrylic acid-acrylamide copolymer or a dry filament of the acrylamide homopolymer;
• cutting the polymerization reaction tube containing the dry filament of the acrylic acid-acrylamide copolymer or the dry filament of the acrylamide homopolymer into a plurality of short polymerization reaction tubes having a preset length and containing the dry filament of the acrylic acid-acrylamide copolymer or the dry filament of the acrylamide
• homopolymer, wherein the preset length is within a range of 5 cm to 15 cm;
• pushing the dry filament of the acrylic acid-acrylamide copolymer or the dry filament of the acrylamide homopolymer out of the short polymerization reaction tubes by a stainless steel wire matching the short polymerization reaction tubes in terms of inner diameter;
• purifying the dry filament of the acrylic acid-acrylamide copolymer or the dry filament of the acrylamide homopolymer with a soaking solution at a preset ratio for 24 h to 36 h to obtain an expanded filament of the acrylic acid-acrylamide copolymer or an expanded filament of the acrylamide homopolymer;
• and
• fixing two ends of the expanded filament of the acrylic acid-acrylamide copolymer or the expanded filament of the acrylamide homopolymer and naturally drying the expanded filament of the acrylic acid-acrylamide copolymer or the expanded filament of the acrylamide homopolymer to obtain an acrylic acid-acrylamide copolymer hydrogel filament or acrylamide homopolymer hydrogel filament having a preset outer diameter.