Hydrophobic Fumed Silica for Adhesives and Sealants

• Customization: Available
• Grade Standard: Food Grade
• Quality: First Class
• Model NO.: BY-612
• Transport Package: Bags
• Specification: 10KG/Bag
• Trademark: czhontech
• Origin: China
• HS Code: 2811229000
• Production Capacity: 60000 Ton/Year
• Package Size: 25.00cm * 50.00cm * 25.00cm
• Package Gross Weight: 10.000kg

Product Description

Hydrophobic fumed silica
 

Product Parameters

 

Item No	characteristics	properties	Properties	Unit	Typical Value	Applications
BY-612	BY-612 is hydrophobic fumed silica which produced by hydrophilic fumed silica with specific surface area of 150m2/g after chemical post-treatment with HMDS (Hexamethyldisilazane)	Thixotropy and reinforcement in RTV silicone sealants, the hydrophobic feature enables RTV silicone sealants a long guarantee time	Specific surface area, BET	m2/g	140±20	Toner & Coatings
			pH value in 4% dispersion (H2O:Ethanol=1:1)	/	5.5~7.5	Anti-corrosive Coatings
		Rheological control of RTV silicone rubber	Loss on drying @ 105ºC×2h	wt.%	≤0.7	Grinding of Copper Products Water-based inks & water-based paints
		Anti-settling,anti-sagging and thixotropy agent Free flow aid and anti-caking aid for powders	Loss on ignition @ 1000ºC×2h	wt.%	≤2.0
			SiO2   Content, based on ignited material	wt.%	≥99.8
			Tamped Density(Based on material dried at 105ºC for 2 hours)	g/dm³	40~60

 

Application

Fumed silica is the material of choice for adhesive and sealant modification. The addition of fumed silica to silicone sealants and adhesives significantly increases bond strength and ensures free flow, prevents caking and sags during cure, slumps, sags, maintains clarity, reinforcement, shear resistance Cut etc. Its mechanism of action is that when it is dispersed in sealants and adhesives, hydrogen bonds are formed between different particles through the silanol groups on their surfaces to form a silica aggregate network, which limits the fluidity of the system and increases the viscosity. To thickening effect; under the action of shear force, the silica network is destroyed, resulting in a decrease in the viscosity of the system and a thixotropic effect, which is convenient for construction. Once the shear force is removed, this network structure can be re-formed, effectively preventing the compound from sagging during curing.

Adding a small amount of fumed silica to the unsaturated resin can give the resin excellent transparency and excellent physical properties, and improve the quality of downstream products.
In the gel coat resin, the addition of fumed silica can improve its thixotropy, so that the resin has good tensile strength, bending resistance, water resistance, heat resistance and other properties, thereby prolonging the service life; in thixotropic resin, gas phase The addition of silica can give it excellent thixotropic properties and reduce the flow and dripping during use; in the putty, fumed silica can be used as an anti-settling agent, with excellent anti-settling effect and excellent performance. Thixotropic properties.
Fumed silica is the material of choice for adhesive and sealant modification. The addition of fumed silica to silicone sealants and adhesives significantly increases bond strength and ensures free flow, prevents caking and sags during cure, slumps, sags, maintains clarity, reinforcement, shear resistance Cut etc. Its mechanism of action is that when it is dispersed in sealants and adhesives, hydrogen bonds are formed between different particles through the silanol groups on their surfaces to form a silica aggregate network, which limits the fluidity of the system and increases the viscosity. To thickening effect; under the action of shear force, the silica network is destroyed, resulting in a decrease in the viscosity of the system and a thixotropic effect, which is convenient for construction. Once the shear force is removed, this network structure can be re-formed, effectively preventing the compound from sagging during curing.
In heat-set offset printing inks, the use of hydrophilic fumed silica can speed up the drying speed of the ink and reduce the phenomenon of smudging and blurring of the ink; in offset printing inks, the use of hydrophobic fumed silica , can reduce the water absorption of the ink, eliminate foam, improve the depth of the ink without affecting its surface gloss; in gravure printing, flexographic printing and silk printing, the use of fumed silica can adjust the viscosity and prevent pigment sedimentation; fumed dioxide Silicon can also be used to control the flow of printer ink, control the fluidity of ink to obtain clear printing; it can be used as a dispersant and flow control agent in the toning of ink cartridges in copiers and laser printers.

Our advantage

Customer Complaint	0%
In-time shipment rate	98%
Recipe customization	Support
After-sales service	Support

 

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