Thermoplastic magnetic composite material and preparation method thereof
A magnetic composite material and thermoplastic resin technology, applied in the direction of magnetic materials, magnetic objects, inductors/transformers/magnets, etc., can solve the problems of single molding size, difficulty in batch production, complex process, etc., achieve low cost, improve electromagnetic Good performance and anti-oxidation effect
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[0034] The preparation method provided by the invention coats carbonyl iron powder with silicon dioxide. Silica is a chemically inert material with good oxidation resistance and low cost. The surface of the carbonyl iron powder is coated with a silicon dioxide film to improve the carbonyl group. Antioxidant properties of iron powder. In addition, the dielectric constant and dielectric loss of the electromagnetic composite material prepared by using the coated silica carbonyl iron powder are reduced, so that the impedance matching of the composite material is better, and the electromagnetic performance is improved.
[0035] In some preferred embodiments, the first surface modifier and the second surface modifier are silane coupling agents, and the silane coupling agent is 3-(2,3-glycidoxy)propyl Trimethoxysilane, also known as KH560 or KH-560. The mass of the first surface modifier is preferably 3-4 wt% of the mass of the carbonyl iron powder, and can be any value within this ran...
Example Embodiment
[0055] Example 1
[0056] Carbonyl iron powder and thermoplastic resin are directly used to compound the carbonyl iron / resin composite material, and the carbonyl iron is not coated with silica.
[0057] The specific preparation method includes the following steps:
[0058] S1. Weigh 6.8kg carbonyl iron powder, 1.2kg LDPE (Low Density Polyethylene), 0.21kg KH560, 0.12kg triolein into the twin-screw extruder, and set the heating zone temperature to 105℃ respectively , 110°C, 120°C, 125°C, 130°C, 135°C, 140°C, 130°C, 130°C, 125°C, screw speed 300rpm, mixing and granulating three times to obtain carbonyl iron / resin masterbatch.
[0059] S2. Put the obtained carbonyl iron / resin masterbatch into the injection molding machine, the temperature of the screw is set to 130℃, 135℃, 140℃, 150℃, 155℃, 145℃, the injection pressure is 113MPa, and the mold temperature is 75℃. Finally, the carbonyl iron / LDPE composite is obtained by injection molding.
Example Embodiment
[0060] Example 2
[0061] In this embodiment, the carbonyl iron powder is first coated with silica, and then compounded with a thermoplastic resin to prepare a carbonyl iron / resin composite material.
[0062] The specific preparation method includes the following steps:
[0063] S1. Weigh 10kg of carbonyl iron powder, stir and mix with 300mL KH560, 1500mL ethanol, 400mL deionized water, and then add dropwise ammonia (commercially available 25% ammonia, NH 3 The content is 25-28wt%, the density is 0.90-0.91g / cm 3 ) 60mL, TEOS (Ethyl Orthosilicate) 120mL into the mixed solution, react for 6h, and finally wash with alcohol and dry to get coated SiO 2 Carbonyl iron powder.
[0064] S2, weigh 9.1kg coated SiO 2 Carbonyl iron powder, 1.0kg HDPE (High Density Polyethylene, high-density polyethylene), 0.27kg KH560, 0.15kg triolein were added to the twin-screw extruder, and the heating zone temperature was set to 160℃, 160℃, 165 ℃, 175℃, 185℃, 200℃, 205℃, 195℃, 195℃, 195℃, screw speed 350rpm, ...
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