Composite electromagnetic shielding material and method for manufacturing same
A shielding material and composite electromagnetic technology, which is applied in the field of electromagnetic pollution prevention and microwave anechoic chambers, can solve the problems of difficult uniform dispersion, high cost and low output of carbon nanomaterials, and achieve the effects of easy dispersion, high production efficiency and large electrical loss.
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[0037] Example 1:
[0038] A composite electromagnetic shielding material, composed of carbonized bacterial cellulose and paraffin wax as a base material;
[0039] The preparation method of the composite electromagnetic shielding material includes the following steps:
[0040] a. Bacterial cellulose is obtained by static shallow dish culture, same as the prior art;
[0041] b. Carbonized bacterial cellulose: the process parameters are: the carbonization temperature of bacterial cellulose is 800~1600 ℃, the background vacuum pressure is 10 -2 ~10 4 Pa, holding time is 0.5 h~4 h;
[0042] c. Take paraffin with the same volume as carbonized bacterial cellulose;
[0043] d. Mix the carbonized bacterial cellulose and paraffin at a volume ratio of 1:1, heat the mixture to 90 ℃ ~ 92 ℃, mechanically stir for 30 ~ 50 minutes, and then mix ultrasonically for 20 ~ 50 minutes in a water bath at 85 ℃ ~ 90 ℃ After cooling.
Example Embodiment
[0044] Example 2:
[0045] A composite electromagnetic shielding material, composed of carbonized bacterial cellulose and epoxy resin as a matrix material;
[0046] The preparation method of the composite electromagnetic shielding material includes the following steps:
[0047] a. Bacterial cellulose is obtained by static shallow dish culture, same as the prior art;
[0048] b. Carbonized bacterial cellulose: the process parameters are: the carbonization temperature of bacterial cellulose is 800~1600 ℃, the background vacuum pressure is 10 -2 ~10 4 Pa, holding time is 0.5 h~4 h;
[0049] c. Take epoxy resin equal in volume to carbonized bacterial cellulose;
[0050] d. Mix the carbonized bacterial cellulose and epoxy resin in a volume ratio of 1:1, mechanically stir the mixture for 30-50 minutes, and then leave it for 1 day to solidify naturally.
Example Embodiment
[0051] Example 3:
[0052] A carbonized bacterial cellulose electromagnetic shielding material, composed of a carbonized bacterial cellulose and a matrix material of silicon dioxide;
[0053] The preparation method of the carbonized bacterial cellulose electromagnetic shielding material includes the following steps:
[0054] a. Bacterial cellulose is obtained by static shallow dish culture, same as the prior art;
[0055] b. Carbonized bacterial cellulose: the process parameters are: the carbonization temperature of bacterial cellulose is 800~1600 ℃, the background vacuum pressure is 10 -2 ~10 4 Pa, holding time is 0.5 h~4 h;
[0056] c. Take the same volume of silicon dioxide as the carbonized bacterial cellulose;
[0057] d. Mix carbonized bacterial cellulose and silicon dioxide in a volume ratio of 1:1, mechanically stir the mixture for 60 minutes and then solidify.
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