High-temperature acid-resistant corrosion-resistant intermediate coating for inner wall of chimney

Abstract

The invention discloses a high-temperature acid-resistant corrosion-resistant intermediate coating for the inner wall of a chimney. The high-temperature acid-resistant corrosion-resistant intermediate coating for the inner wall of the chimney comprises the following components in percentage by weight: 30 to 40 percent of organic silicon-phenolic aldehyde-epoxy resin polymer, 8 to 14 percent of alicyclic amine-aromatic amine epoxy hardening agent, 22 to 25 percent of flaky graphite powder, 18.5 to 3.2 percent of barium sulfate, 5 to 3 percent of glass flake, 0.5 to 0.8 percent of defoaming agent, 11 to 12 percent of dimethylbenzene, 3 to 1 percent of cyclohexanone and 2 to 1 percent of butanol. The organic silicon-phenolic aldehyde-epoxy resin polymer is adopted, so the coating has excellent high temperature resistance, corrosion resistance and sulfur dioxide and sulfuric acid impermeability. Compared with the prior art, the coating obviously improves corrosion resistance of concrete and refractory bricks, is convenient to construct and operate, has wide and readily available material sources, can be applied to resisting corrosion on the inner surfaces of various steel structures and concrete chimneys, and obviously improves economic and social efficiency of desulfurization environment-friendly equipment in the environment-friendly aspect.

Description

[0001] technical field [0002] The invention relates to a coating, in particular to a high-temperature, acid-resistant and anti-corrosion intermediate paint used on the inner wall of a chimney. The intermediate paint is suitable for the inner surface of concrete, refractory bricks and steel structure chimneys with wet and dry desulfurization, and has the function of resisting sulfur corrosion. Background technique [0003] At present, the "chimney concrete acid-resistant anti-corrosion coating" used on the inner surface of concrete, refractory bricks and steel structure chimneys in the field of desulfurization, although its heat resistance can reach 250 ° C × 1h, the bonding strength between the coating and concrete is only 1MPa, and The bond strength of the steel structure is only 2MPa. In the actual construction process, it is often necessary to construct when there is still water vapor on the concrete surface. Because the permeability of the existing "chimney concrete ac...

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Problems solved by technology

Moreover, the existing "chimney concrete acid-resistant and anti-corrosion coating" has poor surface hardness and poor wear resistance. After 1000 tests of reciprocating wiping with a weight of 450g, it was found that it could not effectively withstand the wear of smoke and dust.