Preparation method of oiling agent emulsion for carbon fiber precursor

Abstract

The invention discloses a preparation method of an oiling agent emulsion for a carbon fiber precursor. The preparation method comprises the following steps of stirring a to-be-stirred component by using a stirring paddle for more than 1 minute at the linear speed of the tip of the paddle in the stirring process of 0.5-6.0 m / s to obtain an oiling agent mixed solution with the viscosity of 1.5 Pa.s to 500 Pa.s and an oiling agent emulsion with the particle size of 100-500 nm for the carbon fiber precursor. The method has the advantages that as long as common stirrers in such forms as a paddle type, a turbine type, an anchor type, a belt type, a push type and the like are used for stirring, the oil agent mixed solution with specific components in the method does not need high rotating speed and high shearing force, and emulsion with small particle size can be obtained under the action of low speed and low shearing force, so that the production cost is greatly reduced, and higher economic benefits are obtained.

Description

technical field [0001] The invention relates to a method for manufacturing carbon fibers, in particular to a method for manufacturing an oil emulsion for carbon fiber precursors. Background technique [0002] The current mainstream carbon fiber manufacturing method is to use PAN fiber as a precursor fiber, pre-oxidize it in an oxidative atmosphere at 200-400°C to obtain pre-oxidized fibers, and then carbonize it in an inert atmosphere above 1000°C to obtain carbon fiber. The carbon fiber bundle obtained by using this method has excellent mechanical properties and is widely used in various fields as a reinforcing material for advanced composite materials; During the process, the original filament monofilament is easy to soften and melt under the action of heat, so that it will stick to and merge with the adjacent monofilament. Such phenomena affect the stability of operation and the quality of products. In order to prevent the adhesion between monofilaments and filaments, t...

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Problems solved by technology

The carbon fiber bundle obtained by using this method has excellent mechanical properties and is widely used in various fields as a reinforcing material for advanced composite materials; During the process, the original filament monofilament is easy to soften and melt under the action of heat, so that it will stick to and merge with the adjacent monofilament. and other phenomena, which affect the stability of the operation and the quality of the product. In order to prevent the adhesion between the monofilaments and the filaments, the method of surface treatment of the raw silk fibers is usually carried out with an oil agent.

[0003] The usual carbon fiber raw silk oil treatment liquid is a water emulsion (O / W type emulsion) obtained by dispersing the oil composition of the oil phase in water. In order to make the oil uniformly adhere to the surface of the fiber, the oil in the emulsion must be The particle size of the droplet is small enough; Generally speaking, in the process of manufacturing carbon fiber raw silk oil emulsion, in order to obtain small particle size oil emulsion, generally need to use equipment such as homogenizer, high-pressure homogenizer, oil agent and The water mixture exerts high shear force and mechanical force to disperse the oil agent in water to obtain an emulsion (if only paddle or turbine stirring is used to disperse under low shear force, it is difficult to obtain small particles diameter stable emulsion), however, equipment such as homogenizers and high-pressure homogenizers have relatively high equipment costs. At the same time, in order to obtain small particle size emulsions, it is necessary to use high power to do work on the system, and the energy cost is also relatively high

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