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Combination of refractory bonded magnesia brick manufacturers have several types of storage bricks
(1) hydration - combining with the hydration reaction of the binder and water at normal temperature to produce hydration products. The heat storage brick (2) is chemically combined with the aid of binding agent and hardening agent, or chemical reaction between the binder and refractory at room temperature or chemical reaction when heating occurs, resulting in the formation of a binding agent. (3) polymerization - with the aid of catalyst or crosslinking agent, the bonding agent can be condensed to form a network structure and produce binding strength. (4) ceramic bonding means low temperature sintering, that is to say, adding auxiliary or metal powder that can reduce sintering temperature in bulk refractories, so as to greatly reduce liquid phase temperature and promote low temperature solid liquid reaction to produce low temperature sintering. (5) adhesive bonding is a combination of some of the following physical functions. 1) physical adsorption: binding interactions between molecules depend on - - Van Edward force; 2) diffusion in the material thermal motion of the molecules under the effect of binder and adhesive by molecular diffusion occurs, the formation of diffusion layer, thereby forming a strong bond; 3) electrostatic interaction: binder and the adhesive interface exists double layer by electrostatic force produced with electric double layer. (6) cohesive binding - the aggregation of particles (colloid particles) is formed by the addition of coagulants.
How to classify unshaped refractory materials with binder?
Organic and inorganic bonds are divided according to chemical properties.
Inorganic binder: (1) silicate - calcium silicate cement, water glass, clays and so on. (2) aluminate salts - ordinary calcium aluminate cement, pure calcium aluminate cement, barium aluminate cement and so on. (3) phosphate classes - phosphoric acid, aluminum phosphate two, sodium tripolyphosphate, sodium polyphosphate, and aluminum chromium phosphate. (4) sulfates - Magnesium Sulfate, aluminum sulfate, iron sulphate and so on. (5) chlorides - magnesium chloride, ferric chloride, polyaluminium chloride, etc. (6) sols - silica sol, aluminum sol, silica alumina sol and so on.
Organic binder: (1) natural organic matter - starch, dextrin, Arabia gum, pulp waste liquid, tar, bitumen, sodium sea bath, and so on. (2) the synthesis of organic compounds - epoxy resin, linear phenolic resin, first - order phenolic resin, polystyrene, ethyl silicate, polyamine resin and so on.
Classification according to bond hardening conditions: (1) water hard binder - Portland cement, aluminate cement and so on. (2) pneumatic binding properties - sodium silicate with sodium fluorosilicate, phosphoric acid or phosphoric acid, two aluminum hydroxide plus Magnesium Oxide, silicon oxide powder and calcium aluminate cement. (3) hot bonding agent - phosphoric acid, phosphoric acid, two aluminum hydrogen, and phenol formaldehyde resin.
A temporary and permanent bond is divided at different temperatures.
Temporary binding agents: (1) water-soluble binders, dextrin, powdered carboxymethyl cellulose, powdery and liquid lignosulfonic acid, polyethylene ethanol powder and so on. (2) non water soluble bond - hard bitumen, paraffin, polypropylene and so on.
Permanent bond: (1) carbon binder - tar pitch, phenolic resin and so on. (2) aluminate cement. (3) silicate bond - water glass, ethyl silicate and so on. (4) phosphoric acid and phosphate binder. (5) chloride and sulfate binder.