What is the nature of the waterproof emulsion?

Update:17-08-2018
Summary:

Silicone waterproofing agent has two properties: water- […]

Silicone waterproofing agent has two properties: water-based and oil-based. The water-based silicone water-repellent agent is colorless or light yellow. It is incorporated into cement mortar and can also act as a retarder, water reducer and enhancer. effect. Therefore, it is suitable for use in the construction industry, exterior wall finishes, underground works, antique buildings, pools, bricks, cement, gypsum products and insulation materials based on perlite and waterproofing of rural roofs, moisture and pollution prevention. . The oily silicone waterproofing agent is transparent, generally used for glazed surface, ceramic tile, floor tile, ceramic, etc., and can be diluted by a suitable solvent, and is convenient to use.
Water repellency principle

Water-repellent principle of silicone milk: When the silicone milk is heated above 140 °C, the polysiloxane is oriented on the fabric, the hydrophobic group-CH3 faces outward, the silicon atom of the silicone oil emulsion, the oxygen atom and the fiber Some atoms form a coordinate bond and a hydrogen bond, so that water vapor and air can pass through the fabric, but the water droplets are not transparent. The hydroxyl group at the top of the polysiloxane oil emulsion chain is grafted with hydrogen-containing silicone oil, that is, the Si.H bond in the hydrogen-containing silicone oil is hydrolyzed into Si.H, which is dehydrated and grafted with the terminal hydroxyl group of the silicone oil to form a long-chain molecule, and the molecule becomes larger and softer. Can increase water repellency. The silicone oil and the hydrogen-containing silicone oil are crosslinked at 150-180 ° C on the surface of the fabric to form a water- and solvent-insoluble polyorganosiloxane resin film. In the silane structure, the methyl group faces outward, causing water repellency, film discontinuity and gas permeability.
Scope of application

This product is widely used in the inner and outer walls of various buildings. It can especially solve the indoor mildew problem caused by the water leakage of the east wall and the north wall, which is common in civil houses. It can also be widely used for moisture and mildew treatment before interior decoration. Anti-pollution, anti-weathering, acid-proof and rain-proof treatment of internal and external walls of industrial plants, as well as waterproofing works for reservoirs, water towers, reservoirs, sewage treatment plants and agricultural irrigation and drainage channels; for ancient buildings, stone monuments, ceramic tiles, library archives, precision instruments Room and computer room, power distribution room, warehouse, etc. are also applicable