Inner and outer layer heat medium cyclic heating spinning component for preparing mesophase pitch based carbon fibers

Abstract

The invention discloses an inner and outer layer heat medium cyclic heating spinning component for preparing mesophase pitch based carbon fibers. A feed inlet plate is fixed to an upper inner cavity of a heat medium cyclic heating cavity through a screw thread; a mixed perforated plate is arranged at the top of a lower inner cavity of the heat medium cyclic heating cavity; a first edge filter screen is arranged between the mixed perforated plate and the heat medium cyclic heating cavity; a spinneret plate is arranged on the lower side of the mixed perforated plate; a second edge wrapping filter screen is arranged between the mixed perforated plate and the spinneret plate; an inner layer fixing sleeve and an outer layer fixing sleeve are arranged on the lower side of the spinneret plate; the inner layer fixing sleeve is fixed to the outer wall of the inner cavity of the heat medium cyclic heating cavity through the screw thread; and the outer layer fixing sleeve is fixed to the inner wall of an outer cavity of the heat medium cyclic heating cavity through the screw thread. The spinning component is reasonable and simple in structure and convenient to mount and dismount, the temperature uniformity of the asphalt melt in the spinning component is improved, meanwhile, the temperature control response of the spinning component is fast, the temperature control precision is high, andthe spinning property of the pitch melt and the product quality of the carbon fibers are improved.

Description

technical field [0001] The invention belongs to the field of preparation of mesophase pitch-based carbon fibers, and in particular relates to an inner and outer heat medium circulation heating spinning assembly for preparing mesophase pitch-based carbon fibers. Background technique [0002] Mesophase pitch-based carbon fiber is a kind of high-performance carbon fiber. Due to its highly oriented molecular structure, it shows superiority in modulus and performance. Mesophase pitch-based carbon fiber is generally made of coal tar pitch, petroleum pitch or other pitches. An optically anisotropic intermediate pitch was prepared. [0003] In the melt spinning stage of mesophase pitch, mesophase macromolecules form a highly oriented structure. The main factors affecting the spinning process are spinning equipment, spinneret holes, and spinning temperature. Only by strictly controlling these melt-spinning conditions can carbon fibers with excellent properties be prepared. [0004]...

AI Technical Summary

Problems solved by technology

Therefore, controlling the uniformity and consistency of the spinneret temperature is the prerequisite for the production of high-performance mesophase pitch-based carbon fibers. Currently, the spinning components used in melt spinning all use external heat sources to heat the spinneret. The radial direction of the spinneret is heated from the outside to the inside. When the spinneret reaches the thermal field balance, the temperature of the spinneret holes in the outer ring must be high, and the temperature of the spinneret holes in the inner ring is low, resulting in carbon fiber due to the temperature difference between the inner and outer spinneret holes. The performance of the final carbon fiber is inconsistent, and there are defects such as a decrease in the overall performance of the carbon fiber bundle, a discrete increase in the diameter of the carbon fiber, and an increase in the broken wire rate.

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