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A kind of silicon dioxide airgel microspheres encapsulating/releasing oily substances and preparation method thereof

A technology of silica and oily substances, which is applied in the field of silica airgel microspheres and its preparation, can solve problems such as difficult to realize, and achieve the effects of strong barrier performance, low density and high porosity

Active Publication Date: 2022-03-04
宁波特粒科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, using high-porosity silica aerogels for the encapsulation and release of functional substances is difficult to achieve at the current technical level.

Method used

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  • A kind of silicon dioxide airgel microspheres encapsulating/releasing oily substances and preparation method thereof
  • A kind of silicon dioxide airgel microspheres encapsulating/releasing oily substances and preparation method thereof
  • A kind of silicon dioxide airgel microspheres encapsulating/releasing oily substances and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] 1) Mix 208 grams of tetraethyl orthosilicate, 50 grams of ethanol, and 10 grams of polyethylene glycol (average molecular weight 500) until transparent, then add 7.5 grams of concentrated hydrochloric acid (37% by mass) and 5 grams of Mix the ionic water evenly, after stirring for 5 minutes, raise the temperature to 70°C to continue the reaction for 4 hours, and quickly remove the solvent in the system by distillation under reduced pressure to obtain a flowable and transparent polyalkoxysiloxane prepolymer with a certain viscosity . 2) Add 50 grams of polyalkoxysiloxane prepolymer and 25 grams of hexane into 200 grams of deionized water, stir quickly to obtain a uniform white emulsion, then add 25 grams of ammonia water (mass concentration 25%), and Continue to stir for 5 hours to obtain a milky white dispersion of silica airgel microspheres wrapped in hexane; 3) Centrifuge the dispersion of airgel microspheres to remove the supernatant, wash the lower white solid with ...

Embodiment 2

[0051] The difference between Example 2 and Example 1 is that polyethylene glycol (average molecular weight 500) in step 1) is replaced by polyvinyl alcohol (average molecular weight 750), and the amounts of concentrated hydrochloric acid and deionized water are increased to 15 grams and 10 grams, replace the hexane in step 2) with octyl acetate, and replace the centrifugation-water washing operation in step 3) with funnel filtration.

[0052] The scanning electron micrograph of the silica airgel microsphere of gained octyl acetate wrapping is as follows Figure 6 As shown, its size is in the range of 1-4 microns, the size distribution is relatively uniform, the spherical structure is complete, and the surface is airtight. Its transmission electron microscope pictures are as Figure 7 As shown, the silica framework (dark part) and the porous structure inside the microspheres (light part) can be clearly observed, and the porosity is very high, with a bulk density of 0.06 g / cm ...

Embodiment 3

[0054]The difference between embodiment 3 and embodiment 1 is that in step 1), 208 grams of tetraethyl orthosilicate is replaced by 152 grams of tetramethyl orthosilicate, ethanol is replaced by isopropanol, and polyethylene glycol is replaced by Polyethylene glycol monomethyl ether (molecular weight 500), replace 7.5 grams of concentrated hydrochloric acid (mass fraction 37%) with 7 grams of concentrated nitric acid (mass fraction 68%), replace 25 grams of hexane in step 2) with 35 grams of toluene, Replace 25 g of ammonia with 25 g of aqueous sodium hydroxide (0.1 M).

[0055] The scanning electron micrograph of the silica airgel microsphere of gained wrapping toluene is as follows Figure 11 As shown, the spherical structure of the microsphere is complete, and the size of the microsphere is about 10 microns. Bulk density 0.065 g / cm 3 , with a specific surface area of ​​480 m 2 / g, the pore size distribution is in the range of 2-100 nanometers, concentrated in 10 nanomete...

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Abstract

The invention discloses a silica airgel microsphere that encapsulates / releases oily substances and a preparation method thereof. The airgel is spherical and has a unique composite structure: the spherical shell is denser, the interior is porous, and the barrier performance exceeds that of the core. Shell structure microcapsules. It can wrap oily substances, and under external stimuli, oily substances can be released through the micropores and mesopores on the spherical shell. The preparation method comprises: 1 synthesizing a polyalkoxysiloxane prepolymer; 2 mixing the prepolymer, oily substance and water evenly, adding alkali to obtain a white emulsion; 3 separating, washing and concentrating the white emulsion Or dry to obtain airgel microsphere dispersion or airgel microsphere powder. The preparation of airgel and the wrapping of oily substances are completed simultaneously, which is simple, efficient, and low in cost. The wrapping efficiency is close to 100%, and the wrapping volume can reach 95%. Airgel microspheres have strong mechanical properties and adjustable hydrophilicity and hydrophobicity on the surface and interior. The airgel microsphere can be widely used in construction, textile, cosmetics, biomedicine and other industries.

Description

technical field [0001] The present invention relates to a silica airgel microsphere that encapsulates / releases an oily substance and a preparation method thereof, in particular to a silica airgel microsphere prepared without using a stabilizer or a surfactant, supercritical drying or solvent replacement. Airgel microspheres with high porosity and encapsulating oily substances and their preparation methods and applications. Background technique [0002] Airgel because of its ultra-low density (0.003-0.6 g / cm 3 ), ultra-high specific surface area (400-1500 m 2 / g), ultra-high porosity (80-99.8%) and ultra-low thermal conductivity (0.013-0.038 W / mK), it has become the lightest solid material with the best thermal insulation performance known so far. The pore size of airgel is generally less than 50 nanometers, which is lower than the mean free path (70 nanometers) of air molecules at normal temperature and pressure, which reduces the probability of collisions between air mole...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/14C01B33/158C01B33/157B01J13/00A61K47/04A61K9/50A61K8/25A61K8/11A61Q19/00
CPCC01B33/14C01B33/1585C01B33/157B01J13/0091A61K9/501A61K8/25A61K8/11A61Q19/00A61K2800/10C01P2006/16C01P2004/62C01P2004/61C01P2004/03C01P2004/04C01P2002/88C01P2006/17C01P2006/10C01P2006/12
Inventor 赵永亮朱晓敏
Owner 宁波特粒科技有限公司
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