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Comparative Study On Properties Of Large Tow Carbon Fiber And Small Tow Carbon Fiber


The number of single fibers contained in each bundle of carbon fibers is an important indicator of carbon fibers. Large tow carbon fibers usually refer to fiber bundles with more than 48,000 carbon fibers , including 50,000 , 60,000 , 120,000 , 360,000 , etc., while small tow carbon fibers refer to carbon fiber bundles with a number of fibers less than 48k, such as 1000 , 3000 , 12000 , 24000 , etc. In this article, the editor will talk about the research on the properties of large and small tow carbon fibers.
 
1. The sizing rate of large and small tow carbon fibers was tested. It was found that the sizing rate of domestic carbon fibers was generally higher than that of foreign carbon fibers. For 12K carbon fibers, the sizing rate of domestic carbon fibers was higher than 1%, while the sizing rate of foreign carbon fibers was generally low. For carbon fibers with different tow sizes, the surface sizing rate of 3K carbon fiber is the lowest, the surface sizing rate of 50K carbon fiber is the highest, and the sizing rate of other carbon fibers is similar.
2. The single fiber strength test of carbon fiber was carried out. It was found that for 12k carbon fibers produced by different domestic and foreign manufacturers, the shape parameters of foreign carbon fiber single fiber strength were generally higher than those of domestic carbon fiber, indicating that the discreteness of foreign carbon fiber single fiber strength was smaller than that of domestic carbon fiber. Carbon fiber, that is, the stability is higher than that of domestic carbon fiber. The scale parameters of foreign carbon fibers are generally higher than those of domestic carbon fibers, indicating that the strength of foreign carbon fibers is higher than that of domestic carbon fibers. For carbon fibers with different tow sizes, the shape parameters of large tow carbon fibers fluctuate greatly, while the shape parameters of small tow carbon fibers fluctuate very little, indicating that the stability of large tow carbon fibers is not as good as that of small tow carbon fibers.
3. The research on the interfacial shear properties of carbon fiber resins found that the interfacial shear properties of carbon fibers produced by the dry-jet wet spinning process were better than those produced by the wet spinning process; the interfacial shear properties of carbon fibers/resins in China were generally lower than Foreign carbon fiber; large tow carbon fiber has a fine resin boundary and the shear strength is lower than that of small tow carbon fiber.
As far as the current market is concerned, the usage of small tow carbon fibers is greater than that of large tow carbon fibers, and the quality of foreign carbon fibers is higher than that of domestic carbon fibers. The Japanese Toray T300 and T700 high-performance carbon fiber raw materials introduced by China Be-cu Prototype Material Technology Co., Ltd. can meet the application and manufacture of high-end parts and components in the fields of rail transit, automobiles, and automobiles. Through the modification of the R&D team, it has passed UL94V-0, German DIN5510, British Japanese S6853, European Union EN45545 rail vehicle material fire test standards, reaching the advanced flame retardant level in the domestic industry, and related fiber composite materials have been exported to Europe and the United States for a long time.

 

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