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Thermosensitive aerogel cement and preparation method thereof

An airgel and heat-sensitive technology, applied in the field of building materials, can solve problems such as lack of insulation performance, complex building details, unfavorable floor area, etc., achieve low mechanical strength, weak flexural and compressive resistance, and increase porosity Effect

Inactive Publication Date: 2020-07-03
长沙华脉新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above materials will have the negative effect of not having insulating properties because they absorb leaking water or steam through the airflow for a long time, are damaged by external impacts, or release toxic gases in a fire.
At the same time, traditional thermal insulation materials are used in thicker or multi-storey buildings, which leads to more complex building details, unfavorable floor area and heavier load-bearing performance of the entire building body

Method used

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  • Thermosensitive aerogel cement and preparation method thereof
  • Thermosensitive aerogel cement and preparation method thereof
  • Thermosensitive aerogel cement and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A heat-sensitive airgel cement provided in this embodiment comprises the following components in parts by weight:

[0033]

[0034]

[0035] The preparation method of the above-mentioned heat-sensitive airgel cement provided in this embodiment comprises the following steps:

[0036] 1) Mix 20 parts of aluminum sec-butoxide with distilled water so that the molar ratio of aluminum sec-butoxide to distilled water is 1:50, keep the temperature during the mixing process at 60°C to form an aluminum sec-butoxide solution, and set the concentration to 0.2 Add the nitric acid solution of M into the aluminum sec-butoxide solution, adjust the pH to 2, heat the solution to 80° C. and magnetically stir for 5 hours to form aluminum oxide nano-aqueous sol;

[0037]2) Add 10 parts of carboxymethylcellulose nanocellulose to the aluminum oxide nano-hydrosol obtained in step 1), use a freeze dryer to freeze-dry the wet glue at -60°C for 3 hours, and vacuum sublime for 3 hours to obt...

Embodiment 2

[0041] The difference between this embodiment and Example 1 is that the heat-sensitive polymer particles used are starch-grafted poly(N-isopropylacrylamide)-sodium polyacrylate, and its preparation method comprises the following steps:

[0042] 1) Weigh 3.0 g of starch and add it to 30 ml of bubble-free distilled water, and stir magnetically at 200 rpm for 10 min. During the stirring process, use a constant temperature water bath to heat and keep the temperature at 80° C. to obtain a pretreated starch solution;

[0043] 2) Add 2.0 g of acrylic acid, 4.0 g of poly(N-isopropylacrylamide) and 5 ml of 2% 4-dimethylaminopyridine to the pretreated starch solution obtained in step 1) completely neutralized by NaOH And 5ml mass fraction is 2% potassium citrate, continue to adopt water bath heating to keep temperature at 80 ℃, stir 60min with the rotating speed of 300rpm, obtain starch graft poly(N-isopropylacrylamide)-sodium polyacrylate copolymer body;

[0044] 3) The starch-grafted...

Embodiment 3

[0046] A heat-sensitive airgel cement provided in this embodiment comprises the following components in parts by weight:

[0047]

[0048] Wherein, the preparation method of starch-grafted poly-2-hydroxy ethyl acrylate-potassium polyacrylate copolymer particle comprises the following steps:

[0049] 1) Weigh 3.5g of starch and add it to 35ml of bubble-free distilled water, stir magnetically at 225rpm for 12min, heat with a constant temperature water bath to keep the temperature at 82.5°C during the stirring process, and obtain a pretreated starch solution;

[0050] 2) Add 2.5g of acrylic acid completely neutralized by KOH, 3.5g of poly 2-hydroxyethyl acrylate, 5ml of 2% 4-dimethylaminopyridine and 5ml of mass fraction into the pretreated starch solution obtained in step 1) Potassium citrate with a fraction of 2%, continued heating in a water bath to keep the temperature at 82.5°C, and stirred at a speed of 325rpm for 62min to obtain a starch-grafted poly-2-hydroxyethyl acry...

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Abstract

The invention provides a thermosensitive aerogel cement and a preparation method thereof. The thermosensitive aerogel cement comprises , by weight, 40-50 parts of thermosensitive high-molecular polymer particles, 20-25 parts of silicon dioxide nanometer aerogel, 20-30 parts of aluminum sec-butoxide, 10-15 parts of fly ash, 10-15 parts of nanocrystal, 3-5 parts of a cross-linking agent, 3-5 parts of a persulfate initiator, 0.5-1 part of a water reducing agent, and 0.2-0.5 part of a coagulation accelerator. In the preparation process, aluminum sec-butoxide is adopted as a raw material and catalyzed by nitric acid to prepare nano-reinforced aluminum oxide aerogel, and the nano-reinforced aluminum oxide aerogel is coupled with silicon dioxide aerogel to further improve the porosity of the cement; and the thermosensitive high-molecular polymer prepared by synthesis can effectively perform thermal response and is coupled with the silicon dioxide aerogel to perform volcanic ash reaction, so the influence of the thermosensitive high-molecular polymer on the mechanical degree is reduced, and the finished product has toughness and good mechanical properties and can respond to temperature change in time and cope with the influence of the temperature change.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a heat-sensitive airgel cement and a preparation method thereof. Background technique [0002] Due to the increase in population, the development and expansion of cities, and the maintenance of good indoor thermal comfort conditions, human demand for energy has been increasing in recent years. In addition, rising energy costs and the adverse environmental impact of energy production have fueled the need to find ways to significantly reduce energy consumption. The cooling or heating requirements of buildings during hot or cold seasons are a major contributor to world energy consumption. The building envelope is a structure that isolates the indoor environment from the changing outdoor environment and plays an important role in affecting the cooling and heating loads of the building. Therefore, isolating the indoor environment from the outdoor environment b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/28C08F285/00C08F222/38C08F228/02C08F216/14
CPCC04B26/28C04B2201/20C04B2201/32C04B2201/50C08F285/00C08F222/385C08F228/02C08F216/1458C04B14/064C04B24/40C04B18/08C04B22/14C04B2103/302C04B2103/12C04B24/383C04B24/38
Inventor 袁武
Owner 长沙华脉新材料有限公司
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