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An admixture commonly used in amorphous refractories

Words:[Big][Medium][Small] Mobile Page Two-Dimensional Code 2018-10-15     

In addition to refractory fine materials (granular and powdery), refractory clay and other plastic materials and binders, admixture is used to improve the properties of amorphous refractory materials in the preparation process.

The dosage of additives is not large, generally not more than 5% of the binder dosage.The common admixtures in amorphous refractoriness include water-reducing agent, coagulant regulating agent (coagulant promoting agent, early strength agent and retarding agent), aerating agent, expansion agent, corrosion inhibitor and so on.

1, water reducer: under the condition of not affecting the plasticity of amorphous refractories, water reducer can reduce the unit water consumption;Or under the condition of not changing unit water consumption, the plasticity of amorphous refractories can be improved, or both of the above two effects.Therefore, this kind of water reducer is often called plasticizer.

In amorphous refractories, water-reducing agent is mainly used as cement binding castable and hydraulic refractory mud admixture.There are lignin series and naphthalene series water reducing agents in common use for amorphous refractories.In addition, there are water-soluble resin (melamine resin) water-reducing agent and sugar close type water-reducing agent, humate water-reducing agent.

Setting agent: setting agent is an admixture used to regulate the setting and hardening speed of amorphous refractory materials.

   

(1) coagulant and hardening agent (early strength agent) : coagulant is able to accelerate the setting of the admixture, some also have hardening effect, that is, leading to the combination of early strength growth, but not necessarily a positive effect on the late strength, so coagulant is often called hardening agent (early strength agent).

   

(2) retarder: in order to facilitate construction and storage, a small amount of retarder should be added to appropriately extend the setting and hardening time of the binder.Generally speaking, although these additives can slow down the setting and hardening rate of the binder, they do not change the composition or properties of the product of the binder reaction.

3, corrosion inhibitor: corrosion inhibitor is to slow down the corrosion of metal additive.

4, other additives: expansion agent, flux agent, add air agent, foam agent and so on.

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