Novel heat-conducting nylon composite material and preparation method thereof
A technology of nylon composite materials and thermally conductive fillers, which is applied in the field of materials, can solve the problems of affecting the thermal conductivity of materials, low thermal conductivity of glass fibers, and unsatisfactory physical properties, and achieve enhanced interface bonding, low reaction conditions and equipment requirements. The effect of improving competitiveness
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Embodiment 1
[0025] Preparation of Modified Glass Fiber
[0026] (1) Select alkali-free glass fibers with a diameter between 12 μm and 23 μm, burn the glass fibers at 600° C. for 1 hour, wash them with deionized water three times, and dry them for later use.
[0027] (2) Add dopamine to deionized water to prepare a 2 g / L dopamine aqueous solution, and adjust the pH to 8.5 with Tris-HCl.
[0028] (3) Add the pretreated glass fiber into the dopamine aqueous solution and perform magnetic stirring for 24 hours, then filter the glass fiber and wash it with deionized water, and dry it at 60° C. to obtain the dopamine-modified glass fiber.
[0029] (4) Add aluminum nitride powder with an average particle size of 1.50 μm into ethanol solvent and add stearic acid with 10% mass of aluminum nitride powder, stir evenly and let stand for 2 hours, then add 3% mass of aluminum nitride powder Tween 80, stirred at 60°C for 4 hours, and finally the filtered aluminum nitride powder was washed 3 times with e...
Embodiment 2
[0032] Apply the modified glass fiber prepared in Example 1 to the preparation of heat-conducting nylon, the formula: 50 parts of nylon-6, 70 parts of boron nitride, 20 parts of modified glass fiber, 10 parts of antimony trioxide, KH-570 0.2 Parts, antioxidant 1010 0.15 parts.
[0033] When preparing, put other raw materials except modified glass fiber into the mixer and mix them for 20 minutes to make them fully mixed, then put the mixture into the twin-screw extruder granulator for melting, the processing temperature is 250°C, the screw speed 350r / min, the modified glass fiber is fed into the side inlet, extruded and pelletized by a twin-screw extrusion pelletizer to make uniform pellets.
[0034] The thermal conductivity was tested with a DRE-2C thermal conductivity tester, and the result was 5.216W / (m·K).
Embodiment 3
[0036]The modified glass fiber prepared in Example 1 is applied to the preparation of thermally conductive nylon. In the formula: 70 parts of nylon-6, 70 parts of boron nitride, 30 parts of modified glass fiber, 10 parts of nano-melamine cyanuric acid, KH-570 0.2 Parts, antioxidant 1010 0.2 parts.
[0037] When preparing, put other raw materials except modified glass fiber into the mixer and mix them for 20 minutes to make them fully mixed, then put the mixture into the twin-screw extruder granulator for melting, the processing temperature is 220°C, the screw speed 350r / min, the modified glass fiber is fed into the side inlet, extruded and pelletized by a twin-screw extrusion pelletizer to make uniform pellets.
[0038] The thermal conductivity was tested with a DRE-2C thermal conductivity tester, and the result was 4.108W / (m·K).
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