Acrylic fiber treatment agent and its application

Abstract

The purpose of the present invention is to provide a bundle of fibrous bundles in carbon fiber manufacturing, prevent melting and stable and stable operating acrylic fibrose treatment agent between fibers.The acrylic fibrous treatment agent of the present invention contains a polyetherized compound (B) with a compound (A) and a weight of 8000 to 25,000 in the following (1) compounds (1) shown in the following formula (1).) The total weight ratio is 50 to 99 % %.(In the formula (1), R1 and R2 are independent of hydrogen atoms or alkyl groups. AO is the oxidine group of 2 to 4 of carbon numbers. M and N are independent to be more than 1 or above, respectively.)

Description

technical field [0001] The invention relates to an acrylic fiber treatment agent and its application. More specifically, it relates to a treatment agent used for producing acrylic fibers, an acrylic fiber for carbon fiber production using the treatment agent (hereinafter sometimes referred to as a precursor), and a method for producing carbon fibers using the treatment agent. Background technique [0002] Carbon fibers are widely used in aerospace applications, sports applications, general industrial applications, and the like as reinforcing fibers for composite materials with plastics called matrix resins, taking advantage of their excellent mechanical properties. [0003] As a method for producing carbon fibers, the general method is to convert the precursor into refractory fibers in an oxidizing atmosphere at 200-300°C, and then perform carbonization in an inert atmosphere at 300-2000°C. During firing at these high temperatures, fusion of monofilaments occurs, resulting ...

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Problems solved by technology

[0005] However, on the other hand, the silicone-based treatment agent that has undergone the adhesion treatment will fall off from the fiber and become a sticky substance, which accumulates on the drying roll or guide member in the precursor manufacturing process, which may cause the fiber to be entangled or Problems such as wire breakage that cause a decrease in operability

In addition, in the oxidizing atmosphere of the refractorization process, silicon oxide is partially formed, and when nitrogen gas is used as the inert gas in the inert atmosphere of the carbonization process, silicon nitride is formed, and these scales are deposited. , there may be a problem that the operability or runnability may be reduced, or the firing furnace may be damaged.

[0006] In addition, the silicone-based treatment agent has excellent detachability based on fiber-to-fiber smoothness, which is effective in preventing fusion between single fibers, but on the other hand, when a large number of fiber bundles run in parallel In the sintering process, the width of each fiber bundle becomes wider due to the smoothness of the silicone-based treatment agent, and the distance between adjacent fiber bundles becomes narrower, and fluff may be generated due to interference in some cases.

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