Intermediate phase asphalt raw material for low-temperature spinning as well as preparation method and application of intermediate phase asphalt raw material
A mesophase pitch and mesophase technology, applied in textiles and papermaking, fiber chemical characteristics, etc., can solve the problems of difficult recovery and recycling of catalysts, decreased fiber strength, and increased carbon fiber manufacturing costs, and achieve long-term stable operation. Narrow distribution, the effect of reducing production costs
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Embodiment 1
[0035] Methylnaphthalene, hydrogen fluoride and boron trifluoride were added to the reactor at a molar ratio of 1:1.2:0.2. After reacting at 270°C for 120 minutes, nitrogen was continuously fed to remove low-boiling products, and the temperature was lowered to obtain product pitch P1. The reaction yield was 78 wt%. The mesophase content of the product pitch P1 was measured to be 100% by polarizing microscopy.
[0036] The product P1 was dissolved in quinoline with a solubility parameter of 10.7 for 30 minutes, and the insoluble components were separated by filtration to obtain the product pitch P2. The mesophase content of the product pitch P2 was measured to be 60% by polarizing microscopy.
[0037] The product P2 was centrifuged at 320°C for 30 minutes under the protection of nitrogen, and the components with low density in the upper layer were removed after separation to obtain the lower layer product pitch P3. The mesophase content of the product pitch P3 was measured to...
Embodiment 2
[0040] Methylnaphthalene, hydrogen fluoride and boron trifluoride were added to the reactor at a molar ratio of 1:1.2:0.2. After reacting at 270°C for 240 minutes, nitrogen was continuously fed to remove low-boiling products, and the temperature was lowered to obtain the product pitch P1. The reaction yield was 81 wt%. The mesophase content of the product pitch P1 was measured to be 100% by polarizing microscopy.
[0041] The product P1 was treated under the same conditions as in Example 1 to obtain the product pitch P2; the mesophase content of the product pitch P2 was measured to be 60% by polarizing microscopy.
[0042] Then P2 was centrifuged under the same conditions as in Example 1 to obtain product pitch P3. The mesophase content of the product pitch P3 was measured to be 100% by polarizing microscopy. The softening point measured by capillary rheometer is 228°C, the melt viscosity at 270°C measured by rotational rheometer is 48.3Pa·S, and the average molecular weight...
Embodiment 3
[0045] Methylnaphthalene, hydrogen fluoride and boron trifluoride were added to the reactor in a molar ratio of 1:3.0:0.4. After reacting at 270°C for 120 minutes, nitrogen was continuously fed to remove low-boiling products, and the temperature was lowered to obtain the product pitch P1. The reaction yield was 74 wt%. The mesophase content of the product pitch P1 was measured to be 100% by polarizing microscopy.
[0046] The product P1 was treated under the same conditions as in Example 1 to obtain the product pitch P2; the mesophase content of the product pitch P2 was measured to be 60% by polarizing microscopy.
[0047] Then P2 was centrifuged under the same conditions as in Example 1 to obtain product pitch P3. The mesophase content of the product pitch P3 was measured to be 100% by polarizing microscopy. The softening point measured by capillary rheometer is 214°C, the melt viscosity at 270°C measured by rotational rheometer is 40.7 Pa·S, and the average molecular weigh...
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Abstract
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