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Silanes, Siloxanes & Silicates
Silanes act as molecular bridges between organic and inorganic materials and are used as adhesion promoters in a wide range of applications.
Silanes are the starting materials and the main ingredients in silicone production. WACKER was a pioneer in the manufacture of silicones and started producing silanes in 1950. WACKER manufactures silanes in its integrated production system by direct synthesis from silicon and methyl chloride (Müller-Rochow synthesis). Silicates are produced from tetrafunctional silanes.
Special silanes are used as synthetic building blocks in the chemical and pharmaceutical industries. WACKER offers a wide portfolio of organofunctional and non-functional silanes.
Organofunctional silanes are hybrid compounds that combine the functionality of a reactive organic group with the inorganic functionality of an alkyl silicate in a single molecule. As a result, organofunctional silanes can be used as molecular bridges between organic and inorganic materials. This bridging property is highly important in many applications and industries. Silanes are colorless, clear, volatile liquids that are soluble in organic solvents - including alcohol in some cases.
- GENIOSIL® XB
- SEMICOSIL® UV:
- SILRES® BS
- Adhesion promoter and coupling agent for better anchorage of coatings, adhesives and sealants to many different substrates
- Surface modifiers for optimizing compatibility and permitting the chemical bonding of inorganic fillers to organic polymers
- Curing agents for organic polymers, for example in moisture-curing adhesives and sealants, paints and coatings
- Water scavengers in moisture-curing polymers
- Crosslinkers for polyethylene in the production of heat-resistant pipes or insulating cable sheathing
- Water-repellent agents for protecting construction materials
- Silylating agent
- Dielectrics in semiconductor components
- Construction materials
- Pharmaceutical industry
- Semiconductor industry
WACKER’s portfolio includes various silane-based formulations for applications-specific solutions. A mixture of silanes and siloxanes can be used to achieve the desired balance between penetration behavior and surface effects.
- Hydrophobic agents for protecting masonry and construction materails
- Protecting the infrastructure against the ingress of harmful salts
- Protecting concrete against destructive chemical processes
- Admix applications in dry-mix mortars and concrete
- Damp-proofing against rising damp
- Construction chemicals
- Construction materials
Silanes with a creamy consistency can be easily applied to vertical surfaces in large amounts and feature a relatively long contact time between the silane and surface. This intensifies the penetration and therefore improves the overall performance.
Silane-based emulsions can be diluted with water or easily incorporated into water-based formulations without high-shear mixing.
Silane-based powders are ideal for adjusting the hydrophobic properties of dry-mix compositions to meet requirements.
Silane-siloxane-based concentrates can be diluted with organic solvents for use as highly effective water-repellent agents. Treated substrates are permanently protected.
Silane-siloxane-based silicone microemulsion concentrates, form dilute microemulsions in water. They feature excellent penetration behavior and have many potential applications.
Silicates are derived from oligosilicic acids and differ from silicones in their residual alcohol-group content. Further curing takes place by the addition of catalysts, such as sulfuric acid.
Silicates include all salts and esters of silicic acid. Organic silicates, such as esters of mono- and di-silicic acid can only be produced synthetically. With the exception of alkali silicates (water glass), the inorganic silicates form an important group of naturally occurring silicon-oxygen compounds (silicate materials).
- Stone conservation
- Binders for zinc-rich coatings
Potassium methyl siliconate is a highly alkaline aqueous solution. Diluted with water, it is used for in-plant water-repellent impregnation of heavy clay products such as roofing tiles, floor tiles and flowerpots. After the water has evaporated, the potassium methyl siliconate reacts with atmospheric carbon dioxide (CO2). This produces potassium carbonate (K 2 CO 3 ) and the water-repellent agent poly(methyl silicic acid).
- Hydrophobic agents for clay-based materials such as bricks and roofing tiles.
- Surface treatment of gypsum fiberboards
- Impregnation of insulating materials (perlite, expanded clay, etc.)
- pH adjustment in water-based coatings
- pH control in the production of polymer dispersions
- Construction materials
1,1,1,3,3,3-Hexamethyldisilazane is a colorless liquid with a purity of at least 97.0 percent, at least 98.0 percent or at least 99.0 percent It can be used as a universal silylating agent, for example, for the derivatization of alcohols, carboxylic acids, amines and amides.
- Universal silylating agent, for example for derivatization of alcohols, carboxylic acids, amines or amides