Fluorosilane modified carbon fiber reinforced polyvinylidene fluoride material and preparation method
A technology of polyvinylidene fluoride and polyvinylidene fluoride resin, which is applied in the field of carbon fiber reinforced polyvinylidene fluoride material and its preparation, can solve the problems of unexplained properties of carbon fiber and resin, lack of test results, and insufficient reinforcement effect of carbon fiber on polyvinylidene fluoride Can give full play to other problems, achieve good mechanical properties, improve combination, and improve mechanical properties
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Embodiment 1
[0038] Carbon fiber modification method:
[0039] (1) Continuous carbon fiber (such as figure 1 Shown) (Toray T700) was cut into short fibers with a length of 10mm, and the fibers were refluxed in an acetone solution at 100°C for 24 hours to remove the sizing agent on the surface of the carbon fibers.
[0040] (2) Vacuum-drying the carbon fiber treated in step (1) for 12 hours, and then performing surface oxidation treatment with concentrated nitric acid as a liquid phase oxidant. The treatment condition of concentrated nitric acid is constant temperature at 80°C for 4 hours.
[0041] (3) Prepare a mixed solution of isopropanol and water according to the volume ratio of 9:1, and adjust the pH value to about 5 with dilute hydrochloric acid.
[0042] (4) Add fluorosilane to the mixed solution in step (3), the concentration of fluorosilane is 1wt.%, sonicate for 10 minutes to ensure that it is fully dissolved.
[0043] (5) Add the carbon fiber treated in step (2) into the fluo...
Embodiment 2
[0049] Carbon fiber modification method:
[0050] Change the temperature of the concentrated nitric acid treatment in step (2) of the carbon fiber modification method in Example 1 to 120° C., and the other steps are the same as in Example 1.
[0051] Composite preparation method:
[0052] The modified carbon fiber and thermoplastic resin polyvinylidene fluoride (Kynar720) were dried in an oven at 70°C for 12h. Take 8g of the modified carbon fiber and 72g of polyvinylidene fluoride resin for melt blending in a torque rheometer (HAKKE Polyab OS). The following steps are the same as in Example 1.
[0053] The 10wt% fluorosilane modified carbon fiber reinforced polyvinylidene fluoride composite material prepared in this example has a flexural strength of 58.2MPa and a flexural modulus of 4495MPa, compared with the 10wt.% original carbon fiber reinforced polyvinylidene fluoride composite in Comparative Example 2 material, its flexural strength increased by 21.41%, and its flexur...
Embodiment 3
[0055] Carbon fiber modification method:
[0056] In the step (3) of the carbon fiber modification method in Example 1, the pH adjusted with dilute hydrochloric acid was changed to 6, and the other steps were the same as in Example 1.
[0057] Composite preparation method:
[0058] The modified carbon fiber and thermoplastic resin polyvinylidene fluoride (Kynar720) were dried in an oven at 70°C for 12h. 16g of the modified carbon fiber and 64g of polyvinylidene fluoride resin were melt-blended in a torque rheometer (HAKKE Polyab OS). The following steps are the same as in Example 1.
[0059] attached Figure 4 It is the SEM figure of carbon fiber and resin matrix polyvinylidene fluoride under the conditions of this embodiment, with image 3 It is the SEM figure of the original carbon fiber and resin matrix polyvinylidene fluoride under the conditions of comparative example 3, which can be clearly seen, and image 3 compared to, Figure 4 The medium carbon fiber is more u...
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Abstract
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