Freeze vacuum drying method of micronano powder slurry
A freeze-vacuum drying, micro-nano technology, applied in the direction of drying solid materials, method combination to dry solid materials, drying, etc., can solve the problem of unfavorable product application, too wide, ranging from a few nanometers to a few tens of micrometers or even several tens of micrometers. Hundred microns and other issues
Active Publication Date: 2016-03-02
江西竹生富纳米科技有限公司
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Problems solved by technology
However, the use of this drying method is prone to agglomeration, causing the particle size distribution of the dried product to be too wide, ranging from a few nanometers to tens of microns or even hundreds of microns, making it unfavorable for the application of subsequent products
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[0028] The structure and effect of the present invention will be described in detail by citing the following embodiments in conjunction with the accompanying drawings. However, it should be understood that the present invention is not limited to the content described below, and all modifications and changes made without violating the spirit or scope of the present invention belong to the scope of the present invention.
[0029] The freeze-vacuum drying method of the micro-nano powder slurry provided by the present invention mainly includes the following steps, wherein the micro-nano powder can be but not limited to bamboo charcoal powder, activated carbon powder, coffee charcoal powder or coconut charcoal powder:
[0030] The first cooling step: put a tray containing a micro-nano powder slurry with a solid content of 20wt% to 30wt% into a closed cavity, and cool the micro-nano powder slurry to -11°C to - At 13°C, the micro-nano powder slurry contains a dispersant and a wetting...
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Abstract
The invention relates to a method for freezing and vacuum-drying micro-nanopowder slurry. The method for freezing and vacuum-drying the micro-nanopowder slurry comprises the steps of primary cooling, wherein the slurry is placed in a cavity and is cooled; secondary cooling, wherein the cavity is vacuumized to enable the slurry to be cooled again; low temperature and constant temperature maintaining, wherein the slurry is maintained at a low temperature; primary warming, wherein the slurry is warmed stage by stage; secondary warming, wherein the slurry is warmed stage by stage again; high temperature and constant temperature maintaining, wherein the slurry is maintained at a high temperature; material taking, wherein micro-nanopowder is taken out of the cavity. According to the method for freezing and vacuum-drying the micro-nanopowder slurry, the phenomenon of agglomeration of dried micro-nanopowder can be avoided, and compared with a learning method, the particle size distribution range of the dried powder is narrowed.
Description
technical field [0001] The invention relates to a drying method, in particular to a method for freezing and vacuum-drying micronano powder slurry. Background technique [0002] Bamboo charcoal or activated carbon is widely used in air purification, sewage treatment, textile and other fields because of its excellent adsorption, decolorization, and deodorization effects, especially in the textile field. In order to make bamboo charcoal or activated carbon evenly mixed into textiles In the plastic masterbatch of fiber, bamboo charcoal or activated carbon needs to be made into micron or nanometer powder, and then mixed with plastic raw materials to form masterbatch. Taking bamboo charcoal as an example, the traditional method is to grind bamboo charcoal into granules by wet physical ball milling method. For powders with a diameter of about 10nm to 1000nm (that is, micronano), since the product of the wet ball milling method is a slurry containing powder and liquid, it needs to b...
Claims
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IPC IPC(8): F26B7/00
Inventor 王贵王万贤王万杰
Owner 江西竹生富纳米科技有限公司