CN115676839A - Aerogel slurry and preparation process thereof - Google Patents
Aerogel slurry and preparation process thereof Download PDFInfo
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- CN115676839A CN115676839A CN202110872468.XA CN202110872468A CN115676839A CN 115676839 A CN115676839 A CN 115676839A CN 202110872468 A CN202110872468 A CN 202110872468A CN 115676839 A CN115676839 A CN 115676839A
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Abstract
The invention relates to a preparation process of aerogel slurry, and belongs to the technical field of aerogel slurry. The method comprises the following steps: 1) Sequentially adding 10-100 parts of water and 0.1-5 parts of nano stabilizer into a high-speed dispersion machine, and stirring at the normal temperature and the normal pressure at the speed of 300-1500r/min for 3-10 minutes to obtain a uniformly mixed solution; 2) Adding 1-20 parts of aerogel powder and 0.1-15 parts of nano modifier into the solution obtained in the step 1), stirring at normal temperature and normal pressure for 3-20 minutes at a speed of 500-5000r/min, and uniformly mixing to obtain aerogel slurry. The aerogel slurry disclosed by the invention does not settle, delaminate or dilute after standing for a long time, so that the structure and the performance of the aerogel are retained to the greatest extent, and the problem that hydrophobic aerogel powder is difficult to disperse in a water-based system in the using process is solved.
Description
Technical Field
The invention relates to a preparation process of aerogel slurry, and belongs to the technical field of aerogel slurry.
Background
The aerogel is a nano porous material and has the characteristics of low heat conductivity coefficient, strong hydrophobic capacity, small density, high porosity, large specific surface area and the like. When the composite material is compounded with other materials, due to the super-strong hydrophobic property and the extremely low density, the powder is fluffy and easy to float, so that the compatibility is poor when the composite material is compounded with other materials, and the composite material is difficult to be compatible when the composite material is mixed with water.
Therefore, for better application, a method for preparing aerogel slurry is urgently needed to be provided, which can not only furthest retain the structure and performance of aerogel, but also solve the problem that super-hydrophobic aerogel powder is difficult to disperse in a water-based system in the using process, and CN202011288296.3 discloses a method for preparing aerogel slurry, the aerogel slurry prepared by the method realizes compatible mixing of aerogel and water, but a layered dilute water phenomenon can be generated after long-time standing, the bottom is aqueous solution, the upper layer is aerogel dry slurry, re-dispersion stirring is needed during use, and the original intention of rapid application of the aerogel slurry is obviously deviated. And due to the high specific surface area of the aerogel, the solid content of the aerogel slurry can reach about 20% at most, but at the moment, the aerogel slurry can agglomerate to form a paste with extremely high viscosity, so further research and development are needed.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provide the aerogel slurry which does not settle, delaminate or dilute water after standing for a long time, so that the structure and the performance of aerogel are retained to the maximum extent, and the problem that hydrophobic aerogel powder is difficult to disperse in a water-based system in the using process is solved.
The preparation process of the aerogel slurry is characterized by comprising the following steps of:
1) Sequentially adding 10-100 parts of water and 0.1-5 parts of nano stabilizer into a high-speed dispersion machine, and stirring at the speed of 300-1500r/min for 3-10 minutes at normal temperature and normal pressure to obtain a uniformly mixed solution;
2) Adding 1-20 parts of aerogel powder and 0.1-15 parts of nano modifier into the solution obtained in the step 1), stirring for 3-20 minutes at normal temperature and normal pressure at 500-5000r/min, and uniformly mixing to obtain aerogel slurry;
the nano stabilizer is one or a mixture of any more of bentonite, montmorillonite, attapulgite, diatomite and kaolin;
the aerogel powder has a particle size of 15-1000 microns and a density of 60-80kg/m 3 Super-hydrophobic, the thermal conductivity coefficient is 0.018 w/m.k;
the aerogel is silicon dioxide aerogel.
The nano modifier is one or a mixture of any more of polyvinyl alcohol, dibutyl phthalate, a silane coupling agent kh550 and a silane coupling agent kh 602.
The aerogel slurry is obtained by adopting the preparation process of the aerogel slurry.
The invention compounds aerogel powder with nanometer stabilizer, nanometer modifier and water to form aerogel slurry: the nano stabilizer ensures that the aerogel slurry does not generate layering and water phenomena because the aerogel slurry is dispersed in the aqueous solution to play a thickening and enhancing effect, and avoids the floating layering phenomenon caused by the low density of aerogel powder; the nano modifier enables the hydrophobic aerogel powder to be compatible with water to form a whole body by changing the state of the aqueous solution. The aerogel slurry does not settle, delaminate or dilute after standing for a long time, and can recover the aerogel characteristics with low thermal conductivity and strong hydrophobic ability again after drying and dehydration, because the aerogel slurry does not destroy the internal structure and performance of the aerogel, and the problem that hydrophobic aerogel powder is difficult to disperse in a water-based system is solved, so that the aerogel powder material is convenient to carry, transport and rapidly applied. The content of inorganic matters in the aerogel slurry is more than 95 percent, the content of organic matters is less than 5 percent, and the characteristics of A-grade materials of the aerogel are maintained.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The preparation process of the aerogel slurry provided by the embodiment comprises the following steps in parts by weight:
1. adding 70 parts of water, 1 part of bentonite and 1 part of attapulgite into a container of a high-speed dispersion machine in sequence, and stirring at the normal temperature and the normal pressure at the speed of 1500r/min for 3 minutes to obtain a uniformly mixed solution;
2. adding 10 parts of aerogel (silicon dioxide aerogel) powder with the particle size of 15 microns, 0.5 part of nano modifier polyvinyl alcohol and 0.5 part of dibutyl phthalate into the solution obtained in the step 1, stirring for 10 minutes at 3000r/min at normal temperature and normal pressure, and uniformly mixing to obtain aerogel slurry;
3. drying the aerogel slurry obtained in the step 2 to obtain an aerogel slurry coating, wherein the thermal conductivity coefficient of the aerogel slurry coating is 0.019 w/(m.k), the hydrophobic rate of the aerogel slurry coating is 99%, and the A-grade non-combustible material is restored to an aerogel powder state after being crushed.
Example 2
The preparation process of the aerogel slurry in the embodiment includes the following steps:
1. sequentially adding 100 parts of water, 1 part of bentonite and 1 part of diatomite into a container of a high-speed dispersion machine, and stirring for 5 minutes at the normal temperature and the normal pressure at the speed of 1000r/min to obtain a uniformly mixed solution;
2. adding 15 parts of aerogel (silicon dioxide aerogel) powder with the particle size of 50 microns, 0.8 part of dibutyl phthalate serving as a nano modifier and 0.2 part of silane coupling agent kh602 into the solution obtained in the step 1, stirring for 10 minutes at the normal temperature and the normal pressure at 4000r/min, and uniformly mixing to obtain aerogel slurry;
3. drying the aerogel slurry obtained in the step 2 to obtain an aerogel slurry coating, wherein the thermal conductivity coefficient of the aerogel slurry coating is 0.019 w/(m.k), the hydrophobic rate of the aerogel slurry coating is 99%, and the A-grade non-combustible material is restored to an aerogel powder state after being crushed.
Example 3
The preparation process of the aerogel slurry in the embodiment includes the following steps:
1. sequentially adding 100 parts of water, 1 part of montmorillonite and 1 part of kaolin into a container of a high-speed dispersion machine, and then stirring for 10 minutes at the speed of 800r/min at normal temperature and normal pressure to obtain a uniformly mixed solution;
2. adding 20 parts of aerogel (silicon dioxide aerogel) powder with the particle size of 75 micrometers, 0.5 part of nano modifier silane coupling agent Kh550 and 0.5 part of polyvinyl alcohol into the solution obtained in the step (1), stirring for 15 minutes at normal temperature and normal pressure at 4500r/min, and uniformly mixing to obtain aerogel slurry;
3. drying the aerogel slurry obtained in the step 2 to obtain an aerogel slurry coating, wherein the thermal conductivity coefficient of the aerogel slurry coating is 0.019 w/(m.k), the hydrophobic rate of the aerogel slurry coating is 99%, and the A-grade non-combustible material is restored to an aerogel powder state after being crushed.
Table 1 is a table of the aerogel slurries obtained in examples 1 to 3 and the properties of the aerogel slurries after dehydration and drying
| Examples | Standing for 7 days | Standing for 15 days | Thermal conductivity after dehydration and drying |
| Example 1 | No stratification, sedimentation or xi water | No stratification, sedimentation or xi water | 0.019w/m·k |
| Example 2 | No stratification, precipitation, dilute water | No stratification, sedimentation or xi water | 0.019w/m·k |
| Example 3 | No stratification, precipitation, dilute water | No stratification, sedimentation or xi water | 0.019w/m·k |
According to the parameters, the gel slurry disclosed by the invention does not settle, delaminate or dilute water after being sealed and placed still for a long time, and can recover the aerogel characteristics with low thermal conductivity and strong hydrophobic ability after being dried and dehydrated, because the aerogel slurry does not damage the internal structure and performance of the aerogel, and the problem that hydrophobic aerogel powder is difficult to disperse in an aqueous system is solved, so that the aerogel powder material is convenient to carry, transport and rapidly apply.
Claims (6)
1. The preparation process of the aerogel slurry is characterized by comprising the following steps of:
1) Sequentially adding 10-100 parts of water and 0.1-5 parts of nano stabilizer into a high-speed dispersion machine, and stirring at the speed of 300-1500r/min for 3-10 minutes at normal temperature and normal pressure to obtain a uniformly mixed solution;
2) Adding 1-20 parts of aerogel powder and 0.1-15 parts of nano modifier into the solution obtained in the step 1), stirring for 3-20 minutes at normal temperature and normal pressure at 500-5000r/min, and uniformly mixing to obtain aerogel slurry.
2. A process for preparing an aerogel slurry according to claim 1, wherein said nano-stabilizer is one or a mixture of any more of bentonite, montmorillonite, attapulgite, diatomaceous earth and kaolin.
3. The process of claim 1, wherein the aerogel powder has a particle size of 15 to 1000 microns and a density of 60 to 80kg/m 3 Super-hydrophobic, and the thermal conductivity coefficient is 0.018 w/m.k.
4. The process for preparing an aerogel slurry according to claim 1, wherein said aerogel is a silica aerogel.
5. The process of claim 1, wherein the nano-modifier is one or a mixture of any more of polyvinyl alcohol, dibutyl phthalate, a silane coupling agent kh550 and a silane coupling agent kh 602.
6. Aerogel slurry obtained by the process for preparing an aerogel slurry according to any of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110872468.XA CN115676839A (en) | 2021-07-30 | 2021-07-30 | Aerogel slurry and preparation process thereof |
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| CN202110872468.XA CN115676839A (en) | 2021-07-30 | 2021-07-30 | Aerogel slurry and preparation process thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108624210A (en) * | 2018-05-29 | 2018-10-09 | 贵州盛卓科科技有限公司 | A kind of hydrophobic nano-silica aeroge aqueous slurry |
| CN109467360A (en) * | 2018-11-20 | 2019-03-15 | 广州大学 | A kind of submicro inorganic whisker reinforcement aerogel foam concrete and preparation method thereof |
| CN111548733A (en) * | 2020-03-31 | 2020-08-18 | 大禹伟业(北京)国际科技有限公司 | Preparation method of rubber asphalt material and rubber asphalt material |
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2021
- 2021-07-30 CN CN202110872468.XA patent/CN115676839A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108624210A (en) * | 2018-05-29 | 2018-10-09 | 贵州盛卓科科技有限公司 | A kind of hydrophobic nano-silica aeroge aqueous slurry |
| CN109467360A (en) * | 2018-11-20 | 2019-03-15 | 广州大学 | A kind of submicro inorganic whisker reinforcement aerogel foam concrete and preparation method thereof |
| CN111548733A (en) * | 2020-03-31 | 2020-08-18 | 大禹伟业(北京)国际科技有限公司 | Preparation method of rubber asphalt material and rubber asphalt material |
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