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Nano silicon dioxide powder and its in-situ particle generation method
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A nano-silica and manufacturing method technology, applied in the field of nano-material manufacturing, can solve the problems of nano-silica particle size unevenness, large distribution range, and easy agglomeration of particles
Inactive Publication Date: 2005-06-29
孙晓珑 +2
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Problems solved by technology
[0013] The purpose of the present invention is to provide a manufacturing method of nano-silica powder and its in-situ particle generation, to solve the two major technologies of non-uniform particle size and large distribution range and easy agglomeration of particles in the preparation of nano-silica by existing methods question
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Embodiment 1
[0033] Dilute the commercially available silica sol with a solid content of 30% to 10% with water, add 25ml / L of 95% alcohol, stir evenly, add 0.1 g / L of the dissolved ionic surfactant sodium dodecylbenzenesulfonate, Stir evenly, then add non-ionic surfactant OP-10 in an amount of 25ml / L, stir evenly at high speed, adjust the pH to 9, add an appropriate amount of additives, and then dry with a high-speed centrifugal spray dryer. The operating conditions are:
[0037] The scanning electron microscope picture of the product is as follows figure 1 , it can be seen that despite the occurrence of agglomeration, the distribution of the obtained powder particles is very uniform, with a size of 20±5nm.
Embodiment 2
[0039] Dilute the commercially available silica sol with a solid content of 30% to 20% with water, add ethylene glycol 50ml / L, stir well, add the dissolved ionic surfactant sodium dodecylbenzenesulfonate 0.5 g / L, Stir evenly, then add non-ionic surfactant Pingpingjia, the addition amount is 20ml / L, then add an appropriate amount of additives, stir evenly, and then use high-speed centrifugal spray dryer to dry, the operating conditions are:
[0043] The silicon dioxide technical index of gained is as follows:
[0044] Silica content >99%
[0045] Particle size 15-25nm
[0046] Tap density 0.20g / cm 3
Embodiment 3
[0048] Dilute the commercially available silica sol with a solid content of 30% to 5% with water, add 0.1 g / L of the dissolved ionic surfactant fatty alcoholpolyoxyethylene ethersulfate, stir evenly, and then add the nonionic surfactant Pingpingjia, the addition amount is 50ml / L, then add an appropriate amount of additives, stir evenly, and then use a high-speed centrifugal spray dryer to dry, the operating conditions are:
[0052] Amorphous spherical nano silicon dioxide powder is produced by this method, and the average particle size of the powder is 10-15nm.
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Abstract
the invention objective is to provide a nanometer silicon dioxide powder and the produce method of its original particle. The raw material merchandise-grade siliconsol acted by ionic and non-ionic surface activator and other additions in the solution of adjusted pH value breaks up its agglomerated particles into nanometer particles. The nanometer micro drops blew out by the ultracentrifugal outlet nozzle meets the heat air arising in the dry tower while falling down. The invention mainly resolves two technique problems of that the nanometer siliconpowder produced by existing method is of nonuniform particle diameter which is widely distributed, and particle is easy to agglomerate. The features of the invention are simple operation, lesser device investment, the addition adopted is cheap and abundant, short production cycle, low cost. The invention is adapted to mass production.
Description
Technical field: [0001] The invention belongs to the technical field of nanomaterial manufacturing, in particular to a nano silicon dioxide powder and a manufacturing method for in-situ particle generation thereof. Background technique: [0002] Nano silicon dioxide powder specifically refers to silicon dioxide having an amorphous structure with a particle diameter between 1 and 100 nm. This silicon dioxide is a low specific gravity, fluffy powder formed by irregularly stacking tetrahedrons with silicon atoms as the center and oxygen atoms as the vertices. nano-SiO 2 It is an amorphous white powder, a non-toxic, odorless, non-polluting inorganic non-metallic material. It is a quasi-granular structure of flocculent and reticular, spherical shape. single nano-SiO 2 Due to the strong surface interaction energy, the particles contact each other and agglomerate to form a secondary structure. This aggregation structure may have hard agglomeration and soft agglomeration. The so...
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