2024-06-17 09:57:05
Unshaped refractory material binder refers to a substance used to bond dispersed refractory materials composed of refractory coarse particles and powder together, also known as "binder" or "binder". This type of binder plays a crucial role in amorphous refractory materials, ensuring that the material has high strength and stability at both room and high temperatures.
Binders for amorphous refractory materials can be divided into hydration bonding, chemical bonding, ceramic bonding, adhesive bonding, and coagulation bonding according to their bonding methods.
The binder for amorphous refractory materials should have properties such as being able to harden at room temperature, having small volume changes during hardening, having strength even at high temperatures, not reducing fire resistance, having no impact on human health and the environment, low cost, and stable supply.
The following are some common binders for amorphous refractory materials:
Portland cement: Portland cement is one of the commonly used inorganic binders in amorphous refractory materials. It has advantages such as fast hardening, high strength, and low cost, but its high-temperature resistance is relatively poor, and it is usually used for medium and low temperature refractory materials.
Aluminate cement: Aluminate cement has high fire resistance and strength, fast hardening and high strength, and resistance to sulfate attack. It is widely used as a binder for high-temperature refractory materials such as refractory spray coatings and refractory castables.
Water glass: Water glass (sodium silicate aqueous solution) is also a commonly used inorganic binder. It has good adhesion and high temperature resistance, and can be used to prepare refractory plastics, refractory castables, etc.
Phosphoric acid and phosphate: Phosphoric acid and phosphate binders have good adhesion and strength at high temperatures, making them suitable for the preparation of high-temperature refractory materials. They can react with metal oxides in refractory materials to generate phosphate compounds, thereby improving the material's fire resistance and strength
Clay: Clay is an inorganic binder with good plasticity and bonding properties. It is commonly used in the preparation of refractory plastics and refractory bricks.
Organic resins: organic resin binders such as phenolic resins, epoxy resins, etc., have excellent adhesion and temperature resistance. They are mainly used for preparing high-temperature refractory coatings, refractory fiber products, etc.
Ultra fine powder: When ultra fine powder (such as silica powder, alumina powder, etc.) is used as a binder, the density and strength of the material can be improved by filling the gaps between refractory material particles.
Chemical bonding agent: Certain chemical substances such as magnesium oxide, magnesium chloride, etc. can react with the components in refractory materials under certain conditions to generate new compounds, thereby improving the strength and fire resistance of the material.
Different binders have different advantages, disadvantages, and applicable ranges, so it is necessary to choose according to specific situations.
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