aerogel-w
TRANSCRIPT
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TEC Corporation
▣ AEROGEL PRODUCTS
① Aerogel Powder ② Aerogel Bead
③ Water Base Aerogel Paste
General Data
Viscosity 30,000~40,000 cp
Heat resistance 200~250℃
Freezing stability Stable at -3℃
Surface Chemistry Hydrophobic after cured
Thermal Conductivity 0.015~0.02 W/m.K at 25℃, dry
Solid Content 12~30%, adjustable
Thermal Stability Stable at 80℃
Applying Method Brush, roller or spray gun
Surface Area
Particle Size Range
Pore Diameter
Bulk Density
Surface Chemistry
Thermal Conductivity
10~100μm
70~150kg/m3
20~50nm
Porosity 90~99%
Hydrophobic
300~350 m2/g
0.018~0.02 W/m K at 25°C
Product Feature
Pore Volume 2.2~2.5 cm³/g
Surface Area
Particle Size Range
Pore Diameter
Bulk Density
Surface Chemistry
Thermal Conductivity
1~6mm
150~210kg/m3
20~50nm
Light Transmission
Porosity
30~40%/bead
90~99%
Hydrophobic
300~350 m2/g
0.016~0.019 W/m K at 25°C
Product Feature
Pore Volume 2.2~2.5 cm³/g
• Silica aerogel powder dispersed in water to form paste like form to avoid dust generation during application of aerogel in various composites. The paste retains its
hydrophobic and thermal insulation performance after dries out.
• Due to this characteristics, water based aerogel paste has varieties of application in developing various aerogel composites products like aerogel-pulp, aerogel-ce-
ment, aerogel-fiber, aerogel-paints and coatings for thermal insulation
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TEC Corporation
◈Background
Silica Aerogel can be used in coatings to improve thermal insulation and hydrophobic performance of the coatings and cement composites. But it is very important to select right form of aerogel to achieve target performances.
Following points should be taken into consideration while selecting the right form of silica aerogel.
>> Cement and paint
1. The mixing ability of the silica aerogel with cement and concrete.
2. The mechanical strength of the cement and con-crete after mixing aerogel.
3. The setting time of the cement and concrete com-posites after mixing aerogel.
>> Coating
1. The binder in which the coating is based.2. The adhesion strength of the coatings3. The viscosity of the coatings.4. The curing nature of the coatings.
◈Obstacles in application of Silica Aerogel in Coatings/Paints/Cement.
1. Silica Aerogel has hydrophobic property. The strong water repellant property of silica aerogel limits its wide applications. Due to hydrophobic nature of silica aerogel, it is not easy to mix aerogel in water based binders/ coatings.
2. On the other hand, the nano-pores present in the silica aerogel absorbs solvent based binder/coating into its pores. This causes increase in viscosity, decrease in thermal insulation performance, weak adhesion, elon-gated curing time and difficulty in application.
3. It is chemically difficult to combine cement & paint and aerogel using other forms of binders. This will bring changes in the performance of cement and paint composites like mechanical strength an setting time.
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TEC Corporation
AEROGEL-W
To meet the obstacles in applying silica aerogel powder and bead in specialized coatings, we have devel-oped paste type aerogel product by dispersing hydrophobic aerogel powder in water. The following features makes it applicable in coatings.
Benefits
※ Please refer to the TDS.
▣ Water Based Silica Aerogel Paste: Highly recommended for applying in Coating/Cement/Paint
Water based
Retains Hydrophobic property after dried/cured.
98.% silica aerogel content after dried/cured
Easily mixable in water based binders/coatings.
Easily mixable in solvent based binders/coatings.
Non-dusty and easy to handle
Comparatively lower absorption of solvent than aerogel powder and
bead.
Mixable with organic/inorganic resins(silicones/phenol) without
harm to bonding strength of the resins.
Remarkable upgrade in thermal insulation performance of the coat-
ings.
Remarkable upgrade in thermal insulation performance of the
paints.
Controllable water content and aerogel content.
Controllable viscosity.
Decrease in density of cement and paint composites.
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TEC Corporation
◈Formulations
Coatings
Water based silica aerogel paste can be mixed directly with the
binders/coatings by agitator or stirring.
Depending upon the solvent percentage and bonding strength of
the coatings, water based silica aerogel paste can be used up to
maximum 60% by weight.
Paints & Cement
Water based silica aerogel paste can be mixed directly with the
cement and paints by mixing or stirring.
Water based silica aerogel paste can be mixed up to maximum
50% by weight
Water based silica aerogel contains 70~90% water. This amount of
water should be taken into consideration while mixing with cement
and paints.
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TEC Corporation
Silica Aerogel Cement Composites
Cement composite formed using water based silica aerogel paste.
Benefits of using water based silica aerogel paste with cement or mortars:
Formulation of water based silica aerogel and ce-ment composites :
1. Easy formulation with cement and mortars 2. No dust formation during mixing 3. Solution for the difficulty of mixing hydrophobic aero-
gel powder with cement and mortars due to strong hydrophobic property of silica aerogel
4. Retains hydrophobic property after curing 5. Light weight, lower sp. gravity, hydrophobic property
and lower thermal conductivity compared to the only cement and mortar composites.
1. Add cement or mortars in silica aerogel paste by weight percentage
2. Mix it homogeneously for proper mixing of aerogel paste and cement or mortars
3. By weight percentage 5~20% of silica aerogel paste is recommended. Consider the amount of water present in the silica aerogel paste. It is 80% by weight.
Hydrophobic property of the aerogel –cement com-posite
Aerogel-cement composite floating in water. The sp. grav-ity is lower than 1.
Silica Aerogel Cement Composites Applicable for hydrophobic and light weight cement and concretes
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TEC Corporation
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Conclusion
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