Heat-insulating concrete containing aerogel grains and preparation method thereof

A technology of aerogel particles and gel particles, applied in the field of building materials, can solve the problems of low aerogel density, poor self-strength, poor compressive strength, etc., and achieves broad market application space, good thermal insulation effect, crack resistance, etc. high degree of effect

Inactive Publication Date: 2017-12-08
优澎(嘉兴)新材料科技有限公司
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AI-Extracted Technical Summary

Problems solved by technology

The density of airgel is very low, and the bonding force between the elements that make up the gel skeleton is weak, so its own strength is poor
Therefore, the thermal insu...
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Method used

[0056] According to the above examples, it can be seen that due to the use of reinforced airgel particles, ...
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Abstract

The invention discloses heat-insulating concrete containing aerogel grains and a preparation method thereof. The heat-insulating concrete containing the aerogel grains is characterized by being prepared from the following components in parts by weight: 10 to 50 parts of portland cement, 0.1 to 5 parts of the aerogel grains, 0 to 50 parts of vitrified micro-beads, 0 to 40 parts of fly ash, 0.5 to 10 parts of a dispersion auxiliary agent, 1 to 10 parts of redisperable adhesive powder, 1 to 10 parts of cellulose ether, 0 to 10 parts of anti-cracking fibers and 40 to 100 parts of water, wherein the aerogel grains are strengthened aerogel grains. According to the heat-insulating concrete disclosed by the invention, a preparation process is relatively simple and a heat insulation effect of an aerogel material is kept to the greatest extent; after cement is cured and dried, the concrete has waterproof performance. Furthermore, the strengthened aerogel grains have relatively high strength and are not easily broken; a cement product which takes the strengthened aerogel grains as heat-insulating filling has higher compression-resisting and anti-cracking degrees.

Technology Topic

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  • Heat-insulating concrete containing aerogel grains and preparation method thereof

Examples

  • Experimental program(3)

Example Embodiment

[0029] Example 1
[0030] Weigh the raw materials according to the following ratio:
[0031] 32.5#Portland cement (Conch brand) 100 parts, fly ash (Shanghai Shidongkou Power Plant) 30 parts, reinforced aerogel particles (homemade) 25 parts, hydroxypropyl methylcellulose (Xi'an Ruitai Cellulose) Co., Ltd.) 0.5 parts, polyethylene glycol (Dow Chemical) 0.5 parts, redispersible latex powder (Germany Wacker) 1 part, anti-cracking fiber (Jining Huakai Resin Co., Ltd.) 1 part.
[0032] Among them, the preparation method of reinforced aerogel particles is: 1 part by weight of aerogel particles (Shanghai Yapeng New Material Technology Co., Ltd.) is crushed to 120 mesh with a crusher, and 8 parts by weight of polyvinyl alcohol (Anhui Wanwei The aqueous solution of High-tech Materials Co., Ltd. is used as a binder, and particles with an average particle size of 2 mm are made by a fluidized bed granulation method.
[0033] Thereafter, the above-mentioned weighed raw materials are mixed uniformly.
[0034] Finally, add 100 parts by weight of water and mix evenly to obtain heat-insulating concrete containing reinforced aerogel particles.
[0035] figure 1 Shows the photo of the thermal insulation concrete obtained in Example 1 after coating
[0036] Experimental data:
[0037] The prepared thermal insulation concrete was smeared on a metal plate with a coating thickness of 10mm, and the test was performed 72 hours later. The contact angle is measured to be 125°, the thermal conductivity (average temperature is 25°C) is 0.066W/(m·K); after immersed in water for 72 hours and the surface is dried, the contact angle is measured to be 107°, and the thermal conductivity (average temperature is 25 ℃) is 0.074W/(m·K). The flexural strength of the sample measured by the universal tester is 27.01MPa, and the vertical tensile strength is 0.15MPa.

Example Embodiment

[0038] Example 2
[0039] Weigh the raw materials according to the following ratio:
[0040] 42.5# Portland cement (Conch brand) 100 parts by weight, reinforced aerogel particles (homemade) 10 parts by weight, hydroxymethyl cellulose (Shijiazhuang Hengli Cellulose Co., Ltd.) 1 part by weight, polyvinyl alcohol (Anhui Wanwei High-tech Materials Co., Ltd.) 1 part by weight, redispersible latex powder (WACKER, Germany) 1 part by weight, wood anti-cracking fiber (Shanghai Yingjia Industrial Development Co., Ltd.) 1 part by weight
[0041] Among them, the preparation method of the reinforced aerogel particles is: mixing 1 part by weight of aerogel particles (Shanghai Yapeng New Material Technology Co., Ltd.) and 5 parts by weight of styrene-acrylic emulsion (Shanghai Shenze Chemical Technology Co., Ltd.), using high speed The agitator was stirred for 5 minutes and dried to obtain aerogel agglomerates. The aerogel agglomerates were broken into 35 mesh particles with a crusher.
[0042] Thereafter, the above-mentioned weighed raw materials are mixed uniformly.
[0043] Finally, add 100 parts by weight of water and mix evenly to obtain heat-insulating concrete containing reinforced aerogel particles.
[0044] Experimental data:
[0045] The prepared thermal insulation concrete was smeared on a metal plate with a coating thickness of 10mm, and the test was performed 72 hours later. The contact angle is measured to be 118°, the thermal conductivity (average temperature 25°C) is 0.065W/(m·K); after immersed in water for 72 hours and the surface is dried, the contact angle is measured to be 109°, and the thermal conductivity coefficient (average temperature 25 ℃) is 0.069W/(m·K). The flexural strength of the sample measured by the universal tester is 32.21MPa, and the vertical tensile strength is 0.16MPa.

Example Embodiment

[0046] Example 3
[0047] Weigh the raw materials according to the following ratio:
[0048] 42.5# Portland cement (Conch brand) 100 parts by weight, reinforced aerogel particles (homemade) 20 parts by weight, hydroxypropyl methylcellulose (Xi'an Ruitai Cellulose Co., Ltd.) 0.5 parts by weight, polyacrylamide ( Shanghai Jinjinle Chemical Plant) 1 part by weight, redispersible latex powder (WACKER, Germany) 1 part by weight, polypropylene crack-resistant fiber (Jining Huakai Resin Co., Ltd.) 0.5 parts by weight, wood crack-resistant fiber (Shanghai Yingjia Industrial Development Co., Ltd.) 0.5 parts by weight.
[0049] Among them, the preparation method of the reinforced aerogel particles is: adding the bacterial cellulose skeleton during the production of the aerogel, so that the gel grows in the cellulose network, and the formed aerogel is bound in the cellulose network , To form reinforced aerogel particles.
[0050] Among them, the preparation method of the bacterial cellulose skeleton is: soaking 200 g of food-grade coconut (Hainan Canon Food Factory) with 500 mL of deionized water, changing the water once per hour for a total of 4 hours. The coconut fruit was immersed in 500 mL of 4% NaOH solution at 90°C for 6 hours, then taken out and immersed in deionized water until white, to obtain a cellulose hydrogel. 200g of cellulose hydrogel is soaked in 500mL of tert-butanol for 24h for solvent replacement, then frozen at -18°C and dried in a vacuum freeze dryer to obtain a bacterial cellulose skeleton.
[0051] Among them, the preparation method of strengthened aerogel particles is: mixing ethanol, ethyl orthosilicate, deionized water and 1% hydrochloric acid in a volume ratio of 3:1:0.5:0.03, heating to 60℃ for 1h, and cooling to room temperature to form hydrolysis 1 mL of 0.1 mol/L ammonia water was added to 15 mL of hydrolyzed solution to form a silica sol solution, and the bacterial cellulose skeleton was soaked in the silica sol solution to make the bacterial cellulose skeleton fully absorb the sol solution. After silicon dioxide forms a gel in the bacterial cellulose skeleton, heat at 50°C for 3 hours to age the gel, and then use a solution with a volume ratio of trimethylchlorosilane: triethylamine: dichloromethane=1:1.32:12 Soak in the water for 4h for hydrophobic modification. After the hydrophobized modified composite gel is dried at 110°C, aerogel particles reinforced with bacterial cellulose are obtained.
[0052] Thereafter, the above-mentioned weighed raw materials are mixed uniformly.
[0053] Finally, add 100 parts by weight of water and mix evenly to obtain heat-insulating concrete containing reinforced aerogel particles.
[0054] Experimental data:
[0055] The prepared thermal insulation concrete was smeared on a metal plate with a coating thickness of 10mm, and the test was performed 72 hours later. The contact angle is measured to be 125°, the thermal conductivity (average temperature is 25°C) is 0.050W/(m·K); after immersed in water for 72 hours and the surface is dried, the contact angle is measured to be 110°, and the thermal conductivity (average temperature is 25°C) ℃) is 0.059W/(m·K). The flexural strength of the sample measured by the universal tester is 41.45MPa, and the vertical tensile strength is 0.16MPa.
[0056] According to the above-mentioned embodiments, it can be known that due to the use of reinforced aerogel particles, the prepared thermal insulation concrete has good thermal insulation effect, waterproof effect, and high strength.
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PUM

PropertyMeasurementUnit
The average particle size2.0mm
Thermal conductivity0.066W/k/m
Thermal conductivity0.074W/k/m
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

  • Good insulation effect
  • High strength
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