Fine metallic oxide powder with high dispersancy and toning agent combination containing same
An oxide, fine powder technology, applied in the field of high dispersity metal oxide fine powder, electrostatic charge control, and toner complexes containing said powder, can solve the problem of fine particle size, high energy cost, dust and Deal with existing problems and other problems to achieve the effects of low crushing cost, stable electrostatic charge and good fluidity
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Embodiment 1
[0038] 100 parts by weight of fumed silica (made by NIPPON AEROSIL Co., LTD, whose specific surface area is 400m 2 / g, the average diameter of the primary particles is about 7nm) placed in a mixer, while stirring under a nitrogen atmosphere, 35 parts by weight of organopolysiloxane and 65 parts by weight of n-hexane were added dropwise to the mixed powder and Heat at 250°C for 1 hour. After removal of the solvent, the mixture was crushed and fractionated to cool. The particle size distribution of the fine powder obtained by laser diffraction had a peak at 0.25 μm and included 70% aggregated particles within the range of 0.1-10 μm in the entire volume. In addition, in the obtained fine powder, the hydrophobicity measured by the transparent method was 96%, and the specific surface area measured by the BET method was 150 m 2 / g, the pH value is 5.7, and the bulk density is 30g / l. This fine powder was mixed into a negatively charged toner having an average particle diameter of ...
Embodiment 2
[0042] With 100 parts by weight of ultrafine titanium dioxide powder (manufactured by NIPPON AEROSIL Co., LTD, titanium dioxide TN20, wherein the specific surface area is 20m 2 / g) is placed in a mixer, and while stirring under a nitrogen atmosphere, 4 parts by weight of octyltrimethoxysilane (prepared by SINETSU KAGAKU CO., LTD, KBM3083) and 16 parts by weight of methanol are added dropwise to the mixture in powder. After heating and stirring at 150° C. for 1 hour, the solvent was removed, and the mixture was pulverized and classified by using a pin mill and an air classifier, to be cooled. The particle size distribution of the fine powder obtained by laser diffraction has a distribution peak of aggregated particles at 3.5 μm. In addition, in the obtained fine powder, the hydrophobicity measured by the transparent method was 92.2%, and the specific surface area was 13 m 2 / g, the pH value is 4.3, and the bulk density is 45g / l. This fine powder was mixed into a negatively c...
Embodiment 3
[0046] 100 parts by weight of ultrafine alumina powder (manufactured by DEGUSAHYUELUS Company, having a specific surface area of 100m 2 / g of A1203-C) was placed in a mixer, and while stirring under a nitrogen atmosphere, 20 parts by weight of organopolysiloxane and 40 parts by weight of n-hexane were added dropwise to the mixed powder. After stirring at 250° C. for 1 hour, the solvent was removed, the stirred mass was pulverized by a ball mill and classified by jet sieving, and cooled. The particle size distribution of the fine powder obtained by laser diffraction has a distribution peak of aggregated particles at 3.0 μm. In addition, in the obtained powder, the hydrophobicity measured by the transparent method was 63%, and the specific surface area measured by the BET method was 62 m 2 / g, the pH value is 5.4, and the bulk density is 130g / l. This fine powder was mixed into a negatively charged toner having an average particle diameter of 7 μm to prepare a toner composite...
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