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Preparation method of high-dispersity nano silicon dioxide

A nano-silica, high-dispersibility technology, applied in dyeing polymer organic compound treatment, fibrous fillers, etc., can solve the problems of large particle size distribution range, poor dispersion, etc., to improve dispersion performance, reduce surface energy, The effect of broad application prospects

Pending Publication Date: 2019-11-26
王志胜
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem mainly solved by the present invention is to aim at the relatively large number of hydroxyl groups existing on the surface of nano-silica at present, so that the surface energy is relatively large, so that nano-silica always tends to agglomerate, the particle size distribution range is large, and the dispersibility Poor defects, providing a preparation method of highly dispersed nano-silica

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation of mixed silicon powder:

[0030] Take peat and use 15% sodium hydroxide solution to adjust the pH to 10, place it in a high-pressure steam boiler for 30 minutes, control the temperature of the high-pressure steam boiler to 120 ° C, and the pressure to 4 MPa. After naturally cooling to room temperature, pour it into In a high-speed centrifuge, centrifuge at a speed of 4000r / min for 5 minutes, remove the precipitate, collect the supernatant, adjust the pH of the supernatant to 4 with a sulfuric acid solution with a mass fraction of 40%, let it settle for 12 hours, and collect the supernatant again to obtain peat lysate;

[0031] Use hydrochloric acid with a mass fraction of 10% to adjust the pH of the peat lysate to 2, let it stand for 10 hours, place it in a high-speed refrigerated centrifuge, and centrifuge it at a speed of 3000r / min for 8 minutes, collect the lower layer of solids, and wash the solids with water After 3 times, put it in a freeze dryer, fr...

Embodiment 2

[0038] Preparation of mixed silicon powder:

[0039] Take peat and use 15% sodium hydroxide solution to adjust the pH to 10, place it in a high-pressure steam pot for 32 minutes, control the temperature of the high-pressure steam pot to 122 ° C, and the pressure to 4 MPa. After naturally cooling to room temperature, pour it into In a high-speed centrifuge, centrifuge at 4500r / min for 7 minutes, remove the precipitate, collect the supernatant, adjust the pH of the supernatant to 4 with a sulfuric acid solution with a mass fraction of 40%, let it settle for 16 hours, and collect the supernatant again to obtain peat lysate;

[0040] Use hydrochloric acid with a mass fraction of 10% to adjust the pH of the above peat lysate to 2, let it stand for 12 hours, place it in a high-speed refrigerated centrifuge, and centrifuge it at a speed of 3500r / min for 9 minutes, collect the lower layer of solids, and wash the solids with water After 4 times, put it in a freeze dryer, freeze-dry at...

Embodiment 3

[0047] Preparation of mixed silicon powder:

[0048] Take peat and use 15% sodium hydroxide solution to adjust the pH to 11, place it in a high-pressure steam pot for 35 minutes, control the temperature of the high-pressure steam pot to 125 ° C, and the pressure to 5 MPa. After naturally cooling to room temperature, pour it into In a high-speed centrifuge, centrifuge at a speed of 5000r / min for 8 minutes, remove the precipitate, collect the supernatant, adjust the pH of the supernatant to 5 with a sulfuric acid solution with a mass fraction of 40%, let it settle for 18 hours, and collect the supernatant again to obtain peat lysate;

[0049] Use hydrochloric acid with a mass fraction of 10% to adjust the pH of the peat lysate to 3, let it stand for 15 hours, place it in a high-speed refrigerated centrifuge, and centrifuge it at a speed of 4000r / min for 10 minutes, collect the lower layer of solids, and wash the solids with water After 5 times, place in a freeze dryer, freeze-d...

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Abstract

The invention discloses a preparation method of high-dispersity nano silicon dioxide, and belongs to the technical field of nano material preparation. According to the preparation method, peat is usedas a raw material to carry out cracking and repeated solventing-out; humic acid extracted from the peat is mixed with common nano-silica; and then alkali dissolution is carried out, so that dispersion performance of nano-silica particles is improved, and caking is avoided. According to the method, mixed silicon powder is alkalized and purified by sodium hydroxide to obtain modified silicon powder; a graft copolymerization reaction is carried out on the modified silicon powder with a mixed carboxylic acid monomer; and under the action of an initiator, double bond parts of the mixed carboxylicacid monomer are polymerized with semi-quinonyl groups in the humic acid structure to generate ether bonds, so that a polycarboxylic acid dispersing agent is formed. The polycarboxylic acid group is extremely strong in hydrophilicity and has a relatively large space structure, and relatively large steric hindrance can be generated in a water-based system, so that dispersion performance of the nanosilicon dioxide in the water-based system is improved.

Description

technical field [0001] The invention discloses a preparation method of highly dispersed nano silicon dioxide, which belongs to the technical field of nano material preparation. Background technique [0002] Basic properties of nano silicon dioxide: SiO 2 , white fluffy powder, porous, non-toxic, tasteless and pollution-free, high temperature resistant. At the same time, its chemical inertness and special thixotropic properties can significantly improve the tensile strength, tear resistance and wear resistance of rubber products, and the strength of rubber can be improved by dozens of times. Rheological and thixotropic control of liquid systems, adhesives, polymers, etc., used as anti-settling, thickening, anti-sagging additives, reinforcement of HCR and RTV-2K silicone rubber, can be used to adjust free flow And as an anti-caking agent to improve powder properties, etc. [0003] Production method: gas phase method, also known as pyrolysis method, dry method or combustion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C08F220/06C08F222/06C09C1/28C09C3/10
CPCC01P2004/51C01P2004/64C01P2006/22C08F292/00C09C1/28C09C3/10C08F220/06C08F222/06
Inventor 王志胜
Owner 王志胜
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