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Preparation method of mesophase pitch continuous filaments

A technology of mesophase pitch and filament, which is applied in the field of preparation of mesophase pitch continuous filaments, can solve the problems of high fiber brittleness, large fiber bundle damage, slow spinning speed, etc. Effect

Inactive Publication Date: 2015-12-23
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method for preparing mesophase pitch continuous filaments, which solves the technical problems of high brittleness of mesophase pitch fibers, slow spinning speed and great damage to fiber bundles in the prior art

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0030] A method for preparing continuous filaments of mesophase pitch, adding a small amount of incompatible isotropic naphthalene pitch close to the softening point in the mesophase component of 95 wt% mesophase naphthalene pitch, that is, the isotropic naphthalene pitch The content is 10wt% of the sum of mesophase naphthalene pitch and isotropic naphthalene pitch, the ash content in isotropic naphthalene pitch is 5wt%, and the softening point close means that the softening points of mesophase naphthalene pitch and isotropic naphthalene pitch are different 10°C, heated by twin-screw to 40°C above the softening point of mesophase pitch, melted and blended, and then passed through the SV static mixer, the heating temperature is 40°C above the softening point of mesophase pitch ( figure 2 It is a polarized light micrograph of the blended raw materials blended by a twin-screw-static mixer. A large number of wedge-shaped dislocation structures appear in the intermediate domain str...

Embodiment 2

[0032] A method for preparing continuous filaments of mesophase pitch, adding a small amount of incompatible isotropic methylnaphthalene pitch close to the softening point in the mesophase component of 96wt% mesophase methylnaphthalene pitch, that is, isotropic The content of isotropic methyl naphthalene pitch is 9wt% of the sum of mesophase methyl naphthalene pitch and isotropic methyl naphthalene pitch, and the ash content in isotropic methyl naphthalene pitch is 4wt%. The softening point difference between base naphthalene pitch and isotropic methyl naphthalene pitch is 18°C. After being heated by twin-screws to 30°C above the softening point of mesophase pitch, it is melted and blended, and then passed through a SK static mixer. The heating temperature is mesophase Methyl naphthalene pitch is 50°C above the softening point of the pitch, and then spun after metering. The spinning process is as follows: the spinning temperature is 50°C above the softening point of the mesopha...

Embodiment 3

[0034] A method for preparing continuous filaments of mesophase pitch, adding a small amount of incompatible isotropic coal tar pitch with a close softening point to mesophase coal tar pitch with a mesophase component of 97 wt%, that is, isotropic coal tar pitch The content of tar pitch is 8wt% of the sum of mesophase coal tar pitch and isotropic coal tar pitch, the ash content in isotropic coal tar pitch is 3wt%, and the softening point close means that mesophase coal tar pitch and isotropic The softening point of coal tar pitch differs by 16°C. After being heated by twin-screws to 20°C above the softening point of mesophase coal tar pitch, it is melted and blended, and then passed through an SX static mixer, and the heating temperature is above the softening point of mesophase coal tar pitch. 40°C, and then spinning after metering. The spinning process is: the spinning temperature is 50°C above the softening point of the mesophase pitch, the spinning pressure is 1.5MPa, the d...

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Abstract

The invention relates to a preparation method of mesophase pitch continuous filaments. A small amount of incompatible isotropic pitch with similar softening points is added to mesophase pitch, and after the isotropic pitch is subjected to melt blending through twin screws, the isotropic pitch passes a static mixer, and is metered, spun and wound to obtain the mesophase pitch continuous filaments. The obtained mesophase pitch continuous filaments are large in elongation at break, low in brittleness and good in operability, and particularly meet the requirements of high-speed spinning, and an oiling process and a filament collecting process are greatly simplified.

Description

technical field [0001] The invention belongs to the technical field of carbon fiber precursor preparation and relates to a preparation method of mesophase pitch continuous filament. Background technique [0002] As the most important reinforcement of advanced composite materials, carbon fiber is a typical representative of new industrial materials in the high-tech field. After decades of development, high-strength carbon fibers mainly based on polyacrylonitrile carbon fibers and high-modulus carbon fibers based on mesophase pitch have gradually formed. Because the graphite crystal structure is highly oriented along the fiber axis, the mesophase pitch-based carbon fiber has the characteristics of high modulus and high thermal conductivity, and it has a negative thermal expansion coefficient, making it particularly suitable for the preparation of high thermal conductivity and high precision for dimensional stability. Composite materials are used in satellites, missiles and en...

Claims

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Application Information

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IPC IPC(8): D01F9/145D01F9/32
Inventor 姚艳波余木火
Owner DONGHUA UNIV
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