A spinneret and method for preparing mesophase pitch-based carbon fiber precursors

Abstract

The invention provides a spinneret plate and a method for preparing mesophase pitch base carbon fiber protofilaments. The spinneret plate is of modular design, a hollow runner is arranged, heat conduction media is introduced into the hollow runner to enable the temperature of the center of the spinneret plate to be the same with the temperature of the outer side of the spinneret plate, a temperature difference is lowered, and the integral temperature of the spinneret plate is controlled within an optimal spinning temperature range. The spinneret plate comprises a spinneret plate body, whereinthe spinneret plate body is annularly provided with a plurality of spinning hole units arranged at intervals; snake-shaped heat conduction media runners are arranged between the spinning hole units inthe spinneret plate body at intervals; two ends of each heat conduction media runner are respectively a heat conduction media inlet and a heat conduction media outlet; each spinning hole unit comprises a plurality of spinning holes. The heated heat conduction media passes through the heat conduction media runners, so that the temperature of each spinning hole unit achieves a spinning temperatureand is kept constant; during spinning, fused mesophase pitch is subjected to distribution, pressure equalization and filtering, then, the fused mesophase pitch is sprayed into the spinneret plate, theprotofilaments are sprayed through the spinning holes, and therefore, the protofilaments are prepared into the mesophase pitch base carbon fiber protofilaments.

Description

technical field [0001] The invention belongs to the field of mesophase pitch-based carbon fiber spinning equipment, and relates to a spinneret for spinning mesophase pitch-based carbon fiber precursors, in particular to a spinneret and method for preparing mesophase pitch-based carbon fiber precursors . Background technique [0002] Carbon fiber has excellent properties such as light weight, high strength, and good heat resistance, which is of special significance to the aerospace field, and mesophase pitch-based carbon fiber is particularly suitable for it due to its high modulus, high thermal conductivity and negative thermal expansion coefficient. It is used to prepare composite materials with high thermal conductivity and high dimensional stability requirements, and is used in satellites, missiles and environments with large temperature differences in space. [0003] The difficulty in the preparation of mesophase pitch-based carbon fibers lies mainly in the spinning of ...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the present invention provides a spinneret and method for preparing mesophase pitch-based carbon fiber precursors. The spinneret has a spinning module design, and a hollow flow channel is designed in the spinneret. By introducing a heat-conducting medium into the hollow flow channel, the temperature of each spinning module is consistent, the temperature difference is reduced, and the problem of uneven temperature at each part of the spinneret when preparing mesophase pitch-based carbon fiber precursors is solved, so that the spinning The overall temperature of the board is controlled within the optimum spinning temperature range of mesophase pitch

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