A kind of method for preparing adhesive with electromagnetic wave shielding performance
A technology of shielding performance and electromagnetic wave, applied in the field of preparing adhesives with electromagnetic wave shielding performance, can solve the problems of inability to absorb electromagnetic waves and high amount of phenol, and achieve the effects of good electromagnetic wave absorption strength, gentle and stable response, and easy operation.
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Embodiment 1
[0030] Embodiment 1 surface is rich in the Fe of amine group 3 o 4 Preparation of Magnetic Nanoparticles
[0031] (1) Weigh 6.1g FeCl 3 ·6H 2 O and 4.2 g FeSO 4 ·7H 2 O was dissolved in 100mL deionized water, transferred to a 250mL three-neck flask, heated to 85°C under the protection of argon, and the mechanical stirring speed was 300rpm. When the temperature was 70°C, 10mL ammonia water was added to obtain Fe 3 o 4 Keep the particles at 85°C for 1 hour. After the reaction, use an external magnetic field to separate the black precipitate from the reaction medium, and wash it ultrasonically for 3 times with deionized water until the pH is neutral to obtain Fe 3 o 4 Nanoparticles.
[0032] (2) the Fe obtained above 3 o 4 Nanoparticles were dissolved in 150mL ethanol / water (volume ratio 4:1) solution, ultrasonically dissolved and then transferred to a 250mL three-neck flask, 5mL tetraethyl orthosilicate (TEOS) was added, and the pH was adjusted to 9.0 with ammonia wate...
Embodiment 2
[0033] The preparation of embodiment 2 magnetic lignin
[0034] 1.37g, 2.74g, 5.48g and 8.22g of lignin were respectively dissolved in 20ml of ammonia solution, and ultrasonically dissolved to obtain a lignin solution. The lignin solution was added to the Fe which was rich in amine groups on the surface prepared in Example 1 respectively. 3 o4 Add 10 mL of formaldehyde to the solution of magnetic nanoparticles, and keep warm at 60° C. for 6 hours. After the reaction, wash with ethanol several times until neutral, and obtain Fe after freeze-drying. 3 o 4 @APTES-Lignin solid samples, samples obtained with different lignin dosages are named Fe 3 o 4 @lignin(1:0.5), Fe 3 o 4 @lignin(1:1), Fe 3 o 4 @lignin (1:2) and Fe 3 o 4 @lignin (1:3).
Embodiment 3
[0035] The preparation of embodiment 3 lignin phenolic resin adhesive
[0036] (1) accurately weigh 3g black liquor lignin and the magnetic lignin sample (Fe 3 o 4 @lignin(1:0.5), Fe 3 o 4 @lignin(1:1), Fe 3 o 4 @lignin(1:2), Fe 3 o 4 @lignin (1:3)), 27g phenol and 49.4mL formaldehyde solution were added to the three-necked flask and stirred evenly, then 4.6mL 40% NaOH solution was added, the temperature was raised to 85°C, and the temperature was kept for 3h.
[0037] (2) After the above solution is incubated, add 5.2mL of 40% NaOH solution and 10mL of distilled water at an appropriate speed, and continue to incubate at 85°C for 60min. After the reaction, the temperature was lowered to 40°C, and the prepared lignin phenolic resin adhesive and magnetic lignin phenolic resin adhesive were taken out for later use.
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