Sizing agent applied to constant SiC (Silicon Carbide) fiber and preparation method and application thereof

Abstract

The invention discloses a sizing agent applied to a constant SiC (Silicon Carbide) fiber, and a preparation method and an application of the sizing agent. The sizing agent applied to the constant SiC fiber comprises the following raw materials in parts by weight: 0.15-0.6 part of polyvinyl alcohol, 0.1-1 part of modified organic silicon oil, 0.8-3.0 parts of polyoxyethylene nonyl phenol ether, 0.1-0.8 part of potassium peroxodisulfate and 100 parts of distilled water. The invention further discloses the preparation method of the sizing agent applied to the constant SiC fiber. By utilizing the sizing agent disclosed by the invention to carry out sizing treatment on the constant SiC fiber, the beam tension strength of the SiC fiber can be effectively improved, the broken filaments and the broken heads of the fiber can be effectively wrapped, and the softness of the fiber is improved, so that the stitchability of the fiber is greatly improved; the raw materials are easily accessed; and the sizing agent is simple to prepare, low in cost, stable in property and simple in use, equipment and process, and is easy to implement on a practical constant SiC fiber production line.

Description

technical field [0001] The invention relates to a sizing agent and its preparation method and application, in particular to a sizing agent for continuous SiC fibers and its preparation method and application. Background technique [0002] Silicon carbide fibers have important application values ​​in high-tech fields such as aviation, aerospace, nuclear industry, and weaponry because of their high strength, high modulus, high temperature resistance, oxidation resistance, and corrosion resistance. At present, the industrial production of continuous SiC fibers has been realized by the conversion method of organosilicon polymer-polycarbosilane (PCS) precursor. Its typical preparation process is as follows: Polycarbosilane (PCS) obtained by high-temperature cracking, rearrangement and polycondensation of organosilicon polymers is used as a precursor to obtain continuous PCS fibers through melt spinning, and the continuous PCS fibers are placed in Carry out oxidation reaction in ...

AI Technical Summary

Problems solved by technology

However, there is still a big gap between my country and Japan in terms of the industrial production and practical level of SiC fibers.

[0004] At present, the main problems in the mass production and practical application of SiC fibers in my country are: (1) The bundles are relatively loose during the preparation process, and there are many hairs and broken filaments, which seriously affect the continuous production of fibers; (2) The strength of the bundle is low, and with the increase of the length of the bundle, the strength decreases significantly; (3) There are many defects on the surface of the fiber, which is easy to cause serious fiber damage in the actual application process of weaving and forming composite materials

Due to technical confidentiality and other reasons, there is no public report on SiC fiber sizing agents, and the influence of sizing agents on the structure and properties of SiC fiber reinforced composite materials is lack of systematic research.

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