The application of heat insulation and high temperature resistant coating in the field of heat supply and other pipe parts

With the development of high temperature resistant coatings in urban district heating engineering, especially the rapid development of heat and power co-supply industry, the construction of high temperature pipeline engineering has entered a new stage of development and is facing a period of new technological transformation.In order to achieve the goal of energy conservation and emission reduction, the thermal insulation project of high temperature pipeline will be advanced towards the goal of reducing cost, prolonging life and improving energy conservation, and the thermal insulation application technology should be developed towards the direction of high efficiency, thin layer, heat insulation and waterproof external protection integration.

The traditional thermal insulation measures of high temperature pipelines have some shortcomings, such as too thick thermal insulation layer, too many joints, heavy load, poor adhesion and poor water resistance.At present, the market launched a space energy saving heat insulation and high temperature resistant coating, excellent performance.This type of inorganic binder as the base material, the use of heat resistant hollow ceramic beads and metal aluminum powder as the leading filler, add heat reflection material processing from, at high temperature, normal temperature without odor and harmful substances.Applied to all kinds of industrial heat pipe surface, high temperature resistant heat insulation coating in high temperature environment, by a lightweight, hollow, porous ceramic beads multi-stage combination form inorganic coating and metal aluminum, using its very low thermal conductivity of the porous layer air and reflector to cut off heat transfer, effectively restrain radiation heat transfer and convection heat transfer, so as to achieve the aim of reducing coating surface thermal equilibrium temperature, heat preservation effect is remarkable.

According to the relevant national test standards on the basic performance of thermal insulation coating testing can be known that the performance indicators of the coating have been greatly improved.Inorganic coatings generally show the film brittle cracking, water resistance is not good, poor flexibility and other shortcomings, through the comprehensive modification of the base material and the introduction of high temperature resistant organic resin composite application, not only to ensure the outstanding characteristics of high temperature resistance is excellent, but also improve the coating adhesion, water resistance, flexibility and other comprehensive properties.This is because the high temperature resistant organic resin and sodium silicate inorganic base material composite use, organic resin can be filled in the - Si - O - Si - network structure gap, that can shield the remaining hydroxyl, reduce the sensitivity of the film to water;It can also make up for the lack of toughness of silicon - oxygen bond with good elasticity of organic matter and improve the anti - dry cracking performance of the film.High temperature insulation insulation coating and silicon and oxygen bond in the organic polymer to form a high hardness of the network structure, which increases the strength and temperature resistance of the organic film, the two complement each other, the formation of excellent performance of composite film.

As we all know, there are three main forms of heat transfer: conduction heat transfer, heat transfer and radiation heat transfer. Especially at high temperatures, with the increase of the heated molecules, the ability to radiate energy around in the form of electromagnetic waves is enhanced, and the higher the temperature cutoff, the stronger the radiation ability is.Due to the selection of hollow ceramic beads and metal aluminum powder matching application in the heat insulation coating, fine aluminum powder in the coating to form a metal reflective layer, improve the thermal reflectivity of the coating;The static air layer with low thermal conductivity is formed by multi-stage combination of hollow ceramic microbeads.The reflective layer of the coating can reflect the heat radiation and the static air layer can effectively inhibit the radiation and convective heat transfer.The vast majority of radiant heat energy is blocked by reflection, which effectively improves the total thermal resistance of the coating under high temperature conditions, and the thermal insulation and insulation effect of the coating is more excellent.

Thus, high temperature insulation insulation coating as a high temperature pipeline energy saving material, excellent performance, significant effect, at 600℃ temperature work without bubbling, no cracking, strong adhesion, high hardness, good water resistance, heat insulation performance is strong.Widely used in petroleum, chemical, metallurgy, electric power, mining, military and other industries of high temperature places, such as chimney, pipeline, furnace, oil cracking device, weapons and equipment, has a great market development potential.