Resin-bonded tundish lightweight coating and preparation method thereof

Abstract

The invention discloses a resin-combined tundish light coating and a preparation method thereof. The tundish light coating is composed of the following components in parts by weight: 85-95 parts of magnesia and / or forsterite with the particle size being larger than 0mm and less than or equal to 0.5mm, 0.3-6.0 parts of resin powder, 0.01-2.5 parts of organic acid, 0.1-3 parts of hollow organic fiber, 0.5-3 parts of paper fiber, 0.1-0.3 parts of magnesian sintering aid and 0.01-0.2 part of sodium salt dispersant. The preparation method comprises steps of preparing raw materials, mixing and stirring the raw materials in sequence, adding water and stirring. The tundish light coating is small in volume density, high in strength, good in liquidity, high in hardening rate, uniform in coating structure and the like.

Description

technical field [0001] The invention relates to the technical field of monolithic refractories, in particular to a resin-bonded tundish lightweight coating and a preparation method thereof. Background technique [0002] Tundish coatings are mainly made of magnesia and / or forsterite, which are disposable products with a very large annual consumption. With the depletion of refractory resources such as magnesia and the urgent need of the national energy conservation and environmental protection strategy, tundish coatings have gradually changed from heavy (1.8 to 2.4g / cm 3 ) to lightweight (1.2~1.8 / cm 3 ) direction of development, its porosity is high, the pore size is large, and the thermal insulation effect is excellent. However, the lightweight coatings currently on the market generally use one or more of silica powder, clay, cement, water glass, polyphosphate, etc. as a binder or hardener. In order to increase the adhesion, plasticity and strength of the coating etc., the...

AI Technical Summary

Problems solved by technology

This kind of coating interacts with the infiltrating slag at high temperature to produce a large amount of liquid phase. On the one hand, the refractoriness is greatly reduced, and the erosion resistance is deteriorated; labor intensity

[0003] In addition, in terms of light weight, traditional tundish coatings widely use lignosulfonate, alkylsulfonate or sulfate as air-entraining agents, which have the advantage of significantly reducing the bulk density of the coating and have better However, there are still some problems in the following aspects: (1) The coating is greatly affected by the stirring time, water addition and storage time, and the number and size of air bubbles are difficult to control, resulting in poor density stability and poor coating structure. (2) A large number of fine air bubbles increase the viscosity of the coating and increase the adhesion resistance of the material in the pipeline, making it impossible to use the most conventional domestic piston pump sprayer for construction operations; (3) Lignosulfonate, alkyl Sulfonate or sulfate has a strong retarding effect while entraining air. After the coating is applied, it hardens slowly and is easy to collapse, which directly affects the construction progress.