Dispersing method of inorganic filler
An inorganic filler and dispersion technology, applied in the field of polyimide film, can solve the problems of easy clogging of matting powder and reduction of filter screen, and achieve the effects of good electrical strength, reduced dispersibility, and good matt degree.
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Embodiment 1
[0024] Embodiment 1: Preparation of inorganic filler dispersion slurry
[0025] 1) Take 0.54kg of matting powder (silicon dioxide, with an average particle size of 5μm) and place it in 2.55kg of aprotic polar solvent (DMAC), infiltrate it with ultrasound (10kHz) at room temperature for 1 hour, and control the water temperature of the ultrasound equipment at 20-30°C , the resulting mixed solution is placed in the first sand mill, add 0.1kg dispersant (hyperdispersant SUP1400), and then add zirconium beads with a particle size of 1mm, disperse at a speed of 500r / min for 0.5h, and then disperse at 300+ Disperse at a speed of 0r / min for 2h to obtain a matting powder slurry;
[0026]2) Take 0.54kg of carbon black (primary particle size is 20nm) and put it in 10.26kg of aprotic polar solvent (DMAC), and infiltrate it with ultrasonic (10kHz) at room temperature for 1h, and control the water temperature of the ultrasonic equipment at 20-30°C, the resulting mixture Place in the second...
Embodiment 2
[0039] Embodiment 2: Preparation of inorganic filler dispersion slurry
[0040] 1) Take 0.54kg of matting powder (silicon dioxide, with an average particle size of 3μm) and place it in 2.55kg of aprotic polar solvent (DMAC), soak it with ultrasound (10kHz) at room temperature for 3h, and control the water temperature of the ultrasound equipment at 20-30℃ , the resulting mixed solution is placed in the first sand mill, add 0.1kg dispersant (hyperdispersant SUP1400), then add zirconium beads with a particle diameter of 3mm, disperse for 0.5h at a speed of 500r / min, and then disperse at a speed of 4500r / min The rotation speed of min was dispersed for 2 hours to obtain the matting powder slurry;
[0041] 2) Take 0.54kg of carbon black (primary particle size is 15nm) and place it in 10.26kg of aprotic polar solvent (DMAC), soak it with ultrasonic (10kHz) at room temperature for 6h, control the water temperature of the ultrasonic equipment at 20-30°C, the resulting mixture Place in...
Embodiment 3
[0044] Embodiment 3: Preparation of inorganic filler dispersion slurry
[0045] 1) Take 0.54 kg of matting powder (titanium dioxide, with an average particle size of 7 μm) and place it in 2.55 kg of aprotic polar solvent (DMAC), soak it with ultrasonic (10 kHz) at room temperature for 5 hours, and control the water temperature of the ultrasonic equipment at 20-30 ° C, the obtained The mixed solution was placed in the first sand mill, and 0.1kg of dispersant (hyperdispersant SUP1400) was added, and then zirconium beads with a particle size of 5mm were added, dispersed at a speed of 500r / min for 0.5h, and then at a speed of 6000r / min Disperse at a rotating speed for 2 hours to obtain a matting powder slurry;
[0046] 2) Take 0.54kg of carbon black (primary particle size is 25nm) and place it in 10.26kg of aprotic polar solvent (DMAC), and infiltrate it with ultrasonic (10kHz) at room temperature for 5h, and control the water temperature of the ultrasonic equipment at 20-30°C, th...
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