▎ 摘　　要

NOVELTY - Manufacturing self-regulating heating cable comprises: sequentially adding 10,000 pts. wt. ion-exchanged water and a water-soluble initiator or organic peroxide, 160-220 pts. wt. initiator including carbonate-based initiators and 120-160 pts. wt. buffering agent into a batch mixer and stirring for 30-120 minutes to obtain initiator dispersion; continuously supplying a purge gas at a rate of 1-10 l/hour into a flow reactor, administering distilled water and emulsifier, raising the temperature of the reactor to 80-120° C by stirring for 20-120 minutes, adding 6,000-10,000 pts. wt. monomers and 100-200 pts. wt. chain-transfer agent into the reactor and reacting at 70-120° C with a pressure of 30-60 atm, adding initiator dispersion into the reactor at a rate of 0.5-14 kg/hour, adding monomer at a rate of 10-20 kg/hour, and adding comonomer at a rate of 0.1-5 kg/hour, continuing the reaction for 10-60 minutes, cooling, washing and drying to obtain a fluororesin copolymer. USE - The method is useful for manufacturing self-regulating heating cable. ADVANTAGE - The self-regulating heating cable: has high heat-resistant flexibility and positive temperature coefficient; minimizes the risk of fire and improves the lifespan of the final product by maximizing the dispersion characteristics of the electrically conductive filler; and has heat resistance, flexibility, electrical, mechanical, chemical properties, high workability and productivity. DETAILED DESCRIPTION - Manufacturing self-regulating heating cable comprises: (i) sequentially adding 10,000 pts. wt. ion-exchanged water and a water-soluble initiator or organic peroxide, 160-220 pts. wt. initiator including carbonate-based initiators and 120-160 pts. wt. buffering agent into a batch mixer and stirring at 50-1,000 revolutions/minute for 30-120 minutes to obtain initiator dispersion; (ii) continuously supplying a purge gas including nitrogen, neon, argon and hydrogen at a rate of 1-10 l/hour into a flow reactor equipped with an agitator and a temperature controller, administering 100,000 pts. wt. distilled water and 70-110 pts. wt. emulsifier, raising the temperature of the reactor to 80-120° C by stirring at a speed of 50-500 revolutions/minute for 20-120 minutes, adding 6,000-10,000 pts. wt. monomers and 100-200 pts. wt. chain-transfer agent into the reactor and reacting at 70-120° C with a pressure of 30-60 atm, adding initiator dispersion into the reactor at a rate of 0.5-14 kg/hour, adding monomer at a rate of 10-20 kg/hour, and adding comonomer at a rate of 0.1-5 kg/hour, maintaining reactor pressure to 30-60 atm, stopping the supply of initiator dispersion after reacting for 2-10 hours, continuing the reaction for 10-60 minutes, cooling the reaction solution, filtering and washing at 80-120° C to obtain a copolymer, then drying in an oven for 12-24 hours to obtain a fluororesin copolymer; (iii) sequentially adding 10,000 pts. wt. fluororesin copolymer, 500-2,000 pts. wt. electrically conductive filler, 50-100 pts. wt. irradiation crosslinking agent, 40-80 pts. wt. antioxidant and 25-40 pts. wt. lubricant, which are used alone or in combination with phosphite-based compound into a mixing mixer e.g. kneader, Henschel or Banbury, kneading at 150-350° C for 10-60 minutes, transferring the dough into a single screw or twin screw extruder and extruding to obtain highly heat-resistant flexible positive temperature coefficient pellets with a surface resistance of 101-105 Ω and a size of 3-5 mm; (iv) adding 95,000 pts. wt. alcohol, 5,000 pts. wt. distilled water, 10,000-50,000 pts. wt. silane including vinyl silane and fluorosilane and 500-2,000 pts. wt. acid catalyst into the reactor equipped with a stirrer, stirring at 50-300 revolutions/minute for 20-60 minutes by maintaining pH of 3-5, adding 35,000-55,000 pts. wt. flame retardant including metal hydrates having an average particle size of 0.01-20 μ m, stirring at 50-300 revolutions for 20-60 minutes while maintaining pH of 3-5, stirring at 50-300 revolutions/minute for 20-120 minutes, filtering and then drying at 60-120° C to obtain a silane-surface-treated flame retardant, (v) sequentially adding 100,000 pts. wt. polymer resin pellets, 40,000-100,000 pts. wt. silane surface-treated flame retardant, 50-200 pts. wt. antioxidant and 100-1,000 pts. wt. lubricant into a mixer, kneading the dough for 5-60 minutes at 100-350° C, transferring the dough into a single screw or twin screw extruder to produce 3-5 mm size insulation coating composition pellets through extrusion molding, adding 1,000-20,000 pts. wt. insulation coating composition pellets and irradiation crosslinking agent or crosslinking agent into a separate mixer and mixing at 60-100° C for 10-60 minutes to obtain crosslinked insulation coating composition pellets, and (vi) passing 2-4 conductors through a gas torch or gas oven and heating at 400-1000° C to remove impurities attached to the conductor surface to obtain a heat-treated conductor. DESCRIPTION OF DRAWING(S) - The drawing shows a flowchart illustrating the method for manufacturing self-regulating heating cable (Drawing includes non-English language text).