Water glass introduction
Introduction to Water Glass: Water glass, also known as sodium silicate, is a water-soluble silicate compound. Its aqueous solution is commonly referred to as water glass, with the general chemical formula R₂O·nSiO₂, where R₂O represents an alkali metal oxide such as sodium or potassium. The ratio n, known as the modulus, indicates the proportion of silica to the alkali metal oxide. In construction, the most commonly used form is sodium silicate (Na₂O·nSiO₂), which is widely applied due to its unique properties. Key Properties of Water Glass: Water glass exhibits strong adhesion, high mechanical strength, and excellent resistance to acids and heat. However, it has limited resistance to both alkalis and water, making it unsuitable for certain environments. It is typically available in the form of a clear, orthorhombic bipyramidal crystal or a white to off-white powder. It can be easily weathered, and when heated to 100°C, it loses up to six molecules of crystalline water. It dissolves in water and dilute sodium hydroxide but remains insoluble in ethanol and acids. Its melting point ranges from 40 to 48°C, and it is considered low in toxicity, with a median lethal dose of 1280 mg/kg in rats when ingested orally. Storage Recommendations: Store water glass in a sealed container in a cool and dry place to maintain its stability and prevent degradation. Applications of Water Glass: 1. Surface Treatment: Applying water glass to the surface of materials like clay bricks, concrete, and stone improves their durability, compactness, and resistance to water and frost.
2. Soil Stabilization: When alternately injected into soil along with calcium chloride, water glass forms a silicic acid gel that hardens and stabilizes the soil structure.
3. Quick-Setting Waterproofing Agent: It is used to create fast-setting waterproof coatings.
4. Crack Repair: A mixture of water glass, slag powder, sand, and sodium fluorosilicate can be pressed directly into cracks in brick walls to strengthen and seal them.
5. Acid-Resistant Materials: It is used in the formulation of acid-resistant gels, mortars, and concretes.
6. Heat-Resistant Materials: It helps in producing heat-resistant products.
7. Corrosion Protection: Used in anti-corrosion applications.
8. Casting Bonding Agent: It serves as a binder in foundry processes. Production Methods: There are two main methods for producing sodium silicate: the dry method and the wet method.
1. Dry Method: Quartz sand and soda ash are mixed in specific proportions and heated to around 1400°C in a reverberatory furnace to produce molten sodium silicate.
2. Wet Method: This involves reacting quartz rock powder with caustic soda under high pressure (0.6–1.0 MPa) in a steam chamber to directly produce liquid water glass. Microsilica can be used instead of quartz to achieve a higher modulus of 4. Summary of Key Features: Water glass is valued for its strong bonding ability, high strength, acid resistance, and heat resistance. However, it is not ideal for alkaline or highly moist environments. Its versatility makes it a valuable material in construction, engineering, and industrial applications. Usb Wireless Doorbell,Digital Remote Wireless Doorbell,Wireless Usb Doorbell,Mini Usb Wireless Doorbell Foshan Shunde Advante Electron Ltd. , https://www.china-advante.com