High-hydrophilic and exothermal spinning solution for polyacrylonitrile-based carbon fibers and preparation method thereof

Abstract

The invention discloses high-hydrophilic and exothermal spinning solution for polyacrylonitrile-based carbon fibers and a preparation method thereof. The spinning solution consists of N,N-dimethyl formamide solution of monomer and co-monomer random copolymer. The preparation method for the spinning solution comprises the following steps of: adding azodiisobutyronitrile initiator, acrylonitrile main monomer, allylimidazolidone co-monomer and N,N-dimethyl formamide solvent into a reaction kettle with a condensation and mechanical stirring device, stirring and mixing the components at the room temperature, bubbling the mixture for 10 to 40 minutes by using nitrogen, then reacting the mixture for 6 to 36 hours at the constant temperature of between 50 and 70 DEG C under the protection of the nitrogen, and then removing residual monomers and bubbles to obtain the spinning solution with high hydrophilic property and good exothermal property, wherein the main monomer accounts for 94 to 98 percent of the total mass of the monomers, the co-monomer accounts for 2 to 6 percent of the total mass of the monomers, the azodiisobutyronitrile accounts for 0.2 to 1.0 percent of the total mass of the monomers, and the mass total concentration of the monomers is 15 to 35 percent. The weight-average molecular weight of the copolymer can be controlled to be between 0.1 and 0.35 million, the contact angle of the copolymer and the water is about 32.3 degrees, and the spinning solution has good hydrophilic property and low exothermal rate.

Description

technical field [0001] The invention relates to a spinning liquid and a preparation method thereof, a high-performance polyacrylonitrile-based carbon fiber spinning liquid with high hydrophilicity and excellent exothermic performance containing allyl imidazolidinone structural units and a preparation method thereof. Background technique [0002] Carbon fiber is a reinforced and functional new fiber material with high specific strength and high specific modulus. It is a high-tech product developed rapidly in the 1960s. It has a series of comprehensive functions such as low density, heat resistance, chemical corrosion resistance, friction resistance, thermal shock resistance, electrical conductivity, heat conduction, radiation resistance, good damping, shock absorption, and noise reduction. As a fiber, it also has softness and Weavable and weavable, especially its high specific strength and high specific modulus, make it widely used in cutting-edge fields such as aerospace, na...

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Problems solved by technology

However, vinyl imidazolium salt cannot improve the exothermic properties of polyacrylonitrile alone, and itaconic acid is still added to improve the exothermic properties of polyacrylonitrile

However, adding itaconic acid to polyacrylonitrile and adding vinylimidazolium salt is no different from adding more impurities to polyacrylonitrile, which will undoubtedly hinder the degree of graphitization of polyacrylonitrile-based carbon fiber precursors in the carbonization stage. , which in turn reduces the performance of the resulting carbon fiber

However, comonomers that can improve the exothermic properties of polyacrylonitrile and have good hydrophilicity have not been reported.

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