Preparation method of polycarbosilane non-melting fiber
A technology of polycarbosilane fiber and polycarbosilane, which is applied in the field of polycarbosilane, can solve the problem of high oxygen content in silicon carbide fiber, achieve the effects of less environmental pollution, avoid high oxygen content in insoluble air, and have good application prospects
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Embodiment 1
[0026] 100g of polycarbosilane with a softening point of 187°C and an oxygen content of 0.62wt% was dissolved in toluene with 10g of 1,3,5-trivinyl-1,3,5-trimethylcyclotrisilazane, React at 200°C for 3 hours, and distill off the solvent to obtain polycarbosilane for spinning; put polycarbosilane for spinning into the spinning barrel, melt spinning at 328°C, and introduce the concentration through the atomization spraying device after the fibers are bundled. Obtain polycarbosilane fiber for the ethanol solution of 20wt% azobisisobutyronitrile and Irgacure 1800, wherein the introduction amount of azobisisobutyronitrile and Irgacure 1800 is 1.0wt% (relative to polycarbosilane fiber); Carbosilane fibers are placed in ultraviolet light with a wavelength of 200-280nm, and the intensity of ultraviolet light is 2mW / cm 2 10cm under the ultraviolet light generator, under the condition of ultraviolet light, according to the temperature rise rate of 60 ℃ / hour to 60 ℃, after holding for ...
Embodiment 2
[0028] 100g of polycarbosilane with a softening point of 165°C and an oxygen content of 0.3wt% and 15g of tetramethyldivinyldisilazane dissolved in xylene were mixed, reacted at 250°C for 5 hours, and the solvent was distilled off to obtain spinning Use polycarbosilane; put polycarbosilane for spinning into the spinning barrel, melt spinning at 400°C, and introduce dicumyl peroxide with a concentration of 50wt% and ultraviolet light through an atomizing spraying device after the fibers are bundled. The acetone solution of agent 907 obtains polycarbosilane fiber, wherein the introduction amount of initiator is 0.1wt% (relative to polycarbosilane fiber); Polycarbosilane fiber is placed in ultraviolet light wavelength and is 200-280nm, and ultraviolet light power is 10mW / cm 2Under the ultraviolet light generator at 5cm, under the condition of ultraviolet light, the temperature was raised to 100°C at a rate of 1°C / hour, and the polycarbosilane pre-cured fiber was obtained after h...
Embodiment 3
[0030] 100g of polycarbosilane with a softening point of 214°C and an oxygen content of 0.4wt% and 30g of tetramethyldivinyldisilazane dissolved in phenyl-n-hexane were mixed, reacted at 150°C for 1 hour, and the solvent was distilled off to obtain spinning Polycarbosilane for silk; put polycarbosilane for spinning into the spinning cylinder, melt spinning at 325°C, and after the fibers are bundled, introduce a benzoyl peroxide ether solution with a concentration of 1wt% through an atomizing spraying device to obtain Polycarbosilane fiber, wherein the introduction amount of initiator is 2.3wt% (relative to polycarbosilane fiber); Polycarbosilane fiber is placed in ultraviolet light wavelength and is 320-400nm, and ultraviolet light power is 0.1mW / cm 2 50cm under the ultraviolet light generator, under the condition of ultraviolet light, the temperature was raised to 100°C at a rate of 20°C / hour, and the polycarbosilane pre-cured fiber was obtained after 3 hours of heat preservat...
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