Silica for Adhesives and Sealants

When fumed silica is added and dispersed in adhesives and sealants, a silica agglomerates network is formed, agglomerates react with SI-OH and result in hydrogen bonds, thus flowing property is restricted and viscosity increased, thickening property promoted; but,when shear thinning is applied, hydrogen bonds and silica network breaks,viscosity decreases, this allows adhesives and sealants to be applied smoothly; when shear thinning is removed, network restored,viscosity increases, this prevents adhesives and sealants from sagging during curing process.

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Silica for Adhesives and Sealants

◆Description of products

Reinforcing filler in elastomers,Rheology and thixotropy control in liquid systems
Anti-settling, thickening and anti-sagging agent,Free flow aid and anti-caking aid for powders

Hydrophobic fumed silica is made by hydrolyzing exertion chloroethane in oxy-hydrogen flame. From 2008 year till now, we began to produce fumed silica; the annual sales reached 1500 tons. Main used in paint and coating, as additive agent used to prevent subside, thickening, thixotropic agent and prevent sagging in liquid system. There is an effective changing in the aspect of liquid viscosity.

◆Application Scopes

HTV and RTV Silicone rubber
Adhesives and Sealants
Coatings and Paintings

◆The specification, feature and application

Properties (GS-150)

Unit

Typical Value

Testing Method

Specific Surface Area(BET)

m2/g

150±15

GB/T 20020

PH value in 4% dispersion

3.9~4.5

GB/T 20020

Loss on drying(2 hours at 105℃)

wt%

≤1.5

GB/T 20020

Loss on ignition(2 hours at 1000℃ based on material dried for 2 hours at 105℃)

wt%

≤2.0

GB/T 20020

Sieve Residue(45μm)

wt%

≤0.04

GB/T 20020

Silica Content(Based on ignited material)

wt%

≥99.8

GB/T 20020

Tamped Density(Based on material dried at 105℃ for 2 hours)

g/L

40~60

GB/T 20020