A kind of preparation method of hollow porous microsphere
A porous microsphere, hollow technology, applied in the field of materials, can solve the problems of difficult separation and purification of products, high time cost, long time, etc.
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[0021] The invention provides a method for preparing hollow porous microspheres, which specifically includes the following steps: using sulfonic acid type polystyrene cation exchange resin particles as raw materials, cracking them at a temperature of 350-550°C in a nitrogen or nitrogen-oxygen atmosphere 1-60min to obtain hollow porous microspheres. It should be pointed out that the reactor for pyrolysis of resin particles is a common electric heating device, which can be a muffle furnace or a tube furnace.
[0022] During the cracking process of the sulfonic acid polystyrene series cation exchange resin particles, the temperature difference between the inside and the outside surface of the particles is 1-200°C. Under this temperature difference, the sulfonic acid group is removed inside the resin particle to form sulfur dioxide, and the exposed polystyrene-divinyl phenyl body is cracked to form holes; The matrix is cross-linked to form a stable structure.
[0023] The sulf...
Embodiment 1
[0037] A preparation method of hollow porous microspheres, the specific steps are as follows: using Amberlite IRN-97H sulfonic acid type cation exchange resin with a cross-linking degree of 8% and an average particle diameter of 0.5 mm as a raw material, vacuum drying at 105°C for 4 hours. The dried resin particles were put into a tube furnace for pyrolysis, the pyrolysis temperature was 450°C, the pyrolysis time was 20min, and the pyrolysis atmosphere was a nitrogen-oxygen mixture with an oxygen concentration of 3vt%. Under this condition, the temperature difference between the inside and outside surface of the resin particle was 110°C. After the reaction is over, the product is cooled naturally to obtain hollow porous microspheres.
[0038] The product was sliced, and the structure of the cut surface of the product was observed with a scanning electron microscope, such as figure 1 shown. The outer shell of the prepared product remains in a complete spherical shape, and the...
Embodiment 2
[0040] A preparation method of hollow porous microspheres, the specific steps are as follows: using Amberlite IRN-97H sulfonic acid type cation exchange resin with a cross-linking degree of 8% and an average particle diameter of 0.5 mm as a raw material, vacuum drying at 105°C for 4 hours. The dried resin particles were put into a tube furnace for pyrolysis, the pyrolysis temperature was 450°C, the pyrolysis time was 30min, and the pyrolysis atmosphere was a nitrogen-oxygen mixture with an oxygen concentration of 5vt%. Under this condition, the temperature difference between the inside and outside surface of the resin particle is 80°C. After the reaction is over, the product is cooled naturally to obtain hollow porous microspheres.
[0041] The product was sliced, and the structure of the cut surface of the product was observed with a scanning electron microscope, such as figure 2 shown. The outer shell of the prepared product remains in a complete spherical shape, the inte...
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