Fuel loss? Insulation paint helps you "lock in" the heat!

With the development of society and the requirements of low-carbon environmental protection, energy conservation and consumption reduction have become a major problem in energy applications and scientific research. However, in high-temperature steam pipes, pipelines, high-temperature work parts, buildings and other occasions, the loss of high-temperature heat is often difficult to avoid, not only fuel waste, but also these lost heat is easy to burn people, affecting production.
clearly, allowing these energy losses is not a wise choice

. Therefore, if you want to prevent high-temperature hot objects from emitting more heat, you can apply "insulation coating" on the surface of high-temperature objects. After drying and curing, they form a thermal insulation coating with a certain strength and toughness, which can effectively suppress heat loss and require cheaper than ordinary insulation materials.
Insulation insulation coating classification
At present, insulation insulation coatings have the following categories, according to the differences between bone and filler, insulation insulation coatings are divided into: composite silicate insulation coatings, ceramic insulation coatings, hollow glass bead insulation coatings, metal bauxite insulation coatings. According to different processing processes can be divided into heating type, room temperature non-heating type and dry powder type. According to its insulation thermostat can be divided into: barrier-type thermal insulation coating, reflective insulation coating and radiation-type thermal insulation coating.
, by material classification
1. Composite silicate insulation coating
composite silicate insulation coating to sea bubble stone, expansion pearl rock and expansion zircon as the bone material, diatom soil, titanium dioxide, mica and other pigments, add reinforced fiber and appropriate amount of curing agent, made through a certain process. The adhesive used has also gradually changed from a single type of water glass adhesive to a composite adhesive such as water glass and silicone sol, cement and gypsum. Various additives can also be added according to performance requirements and application characteristics. After ball grinding, mechanical pulping, dispersion, stirring and other processes to develop insulation coating, the coating has a small weight, fire flame retardant, low thermal conductivity, drying time and drying shrinkage and so on. At present, composite silicate insulation coatings in petrochemical, construction facades, paper shipbuilding and electronic machinery and other industries have been widely used.
2. Ceramic insulation coatings
ceramic insulation coatings are prepared from substations, ceramic microbeads, curing agents and various additives. The biggest advantage of this coating is the high temperature resistance, as well as high thermal reflectivity and excellent radiation performance and thermal barrier performance, for high temperature equipment and pipe equipment can maintain most of the heat does not lose. And has excellent thermal insulation and high temperature chemical stability and corrosion resistance, especially economical energy saving. At present, ceramic insulation coatings are widely used in high-temperature equipment, building facades and marine paper and other industries.
ceramic hollow microbead SEM map
ceramic microbeads are the main components of SiO2 and Al2O3, after 1400 degrees C high temperature heating sub-selected, diameter between 5 to 1000 microns, the larger its diameter, the higher the hollow heart rate, the smaller. This hollow microbead is a loose, well-fluid powder material, the appearance of gray-white, with good flame retardant, electrical insulation, its density is small, low oil absorption rate, and high strength. Because of its stable performance, good weather resistance and low price, it has been widely used.
3. Hollow glass bead insulation coating
Hollow glass bead insulation coating is a hollow glass microbead for lightweight bone material prepared for insulation coating. Hollow glass microbead diameter is very small, with many other bone can not be exceeded excellent characteristics, such as high pressure and stretch strength, high temperature resistance, electrical insulation and good insulation, low thermal conductivity and small dry shrinkage, also known as the "space age materials." This coating has been widely used in petrochemical and construction industry, as a promising new variety of insulation coatings.
Hollow glass microbeadSEM diagram
In addition, hollow glass microbeads also have light quality, high dispersion, good mobility, both water resistance (low water absorption rate), corrosion resistance and other characteristics, so the introduction of hollow glass microbeads in the coating can not only improve the thermal insulation performance of the coating, but also make the coating with light characteristics.
4. Metal bauxite insulation coating
metal bauxite insulation coating is a bauxite for the development of insulation coating. It has high heat resistance, chemical stability, aging resistance and heat impact resistance, and is widely used in the production process of metal castings (cast iron, cast steel, etc.). Gao Ge and other successful preparation of a metal bauxite insulation coating, the coating can reduce the thermal impact on metal castings, extend the life of castings, but also improve the brightness and smoothness of the casting surface, play a beautiful role.
2, according to the principle of insulation classification
heat transfer is mainly through thermal conduction, convection and radiation three ways to achieve, thermal conductivity of insulation coatings is determined by the combined effects of these three ways, can be divided into barrier type, reflection type and radiation type three categories.
the heat transfer path of the
1. Barrier-type insulation
insulation coating is a passive coating with low thermal conductivity and high impedance. The insulation mechanism of this coating is relatively simple, mainly to choose a material with low thermal conductivity as a thermal insulation bone or in the coating film to introduce air (very low thermal conductivity), with small density, high pore rate characteristics of inorgeable minerals as functional fillers, and then choose good weather resistance, good film-forming base binder processed into a paste coating, applied to the surface of the equipment, solidified to form a certain thickness of thermal insulation to obtain good thermal insulation. The size of the thermal conductivity of the various parts in the coating plays a decisive role in the thermal insulation performance of the coating.
2. Reflective insulation coatings
the wavelengths of solar radiation energy radiated to the earth are mainly distributed in the 0.25 to 2.5 m band, in the visible and near-infrared light zones 0.4 to 2.5 m band has a high reflection ratio. In this wavelength range, the higher the reflectivity, the better the insulation effect. For long-term exposure to the sun on the surface of the object, can be reflected insulation for thermal insulation.
reflective insulation coating mainly with hollow microbeads, aluminum powder, titanium dioxide, ZnO and other reflective bone or filler as powder, through adhesive and tight bonding preparation into a coating film to achieve thermal insulation effect. With the closed pore structure inside these materials, secondary reflection and scattering of heat entering the inside of the coating is expected, and after repeated reflection and scattering, the vast majority of the heat is blocked from the coating. In reflective insulation coatings, the difference in the refractive index between the base material and the pigment has a direct effect on the insulation performance of the coating. At the same time, the particle size, size distribution, particle shape and dosing of pigments will have a greater impact on reflectivity.
reflective insulation coatings are commonly used in urban buildings
3. Radiation-type insulation coatings
material molecules absorb photons, energy conversion, to promote the vibration of molecules, rotational energy changes, so that the lattice, key group constantly vibration to produce collisions, so that the molecular energy state stage from high to low heat emission, which will absorb some of the energy in the form of infrared radiation to the outer space, thereby reducing the temperature inside the substance. Therefore, the radiation-type insulation coating is the process of converting the heat absorbed by the material into thermally reflected electromagnetic waves into the atmosphere. Barrier-type, reflective insulation coatings can only slow down the transfer of heat, while radiation-type insulation coatings can have absorbed heat in the form of electromagnetic waves emitted, not trapped in it. The pigments commonly used are metal oxides with high thermal emission rates, such as Fe2O3, CuO's sharpstone-type substances.
application of thermal insulation coatings
Insulation insulation coatings with high efficiency, insulation, energy saving and environmental protection, easy to use and good economic effects and so on, its functionality has crossed many fields. Such as in the petrochemical industry, it is used in storage tanks, oil tanks, oil depots, pipelines, cracking equipment, offshore drilling platforms, etc. , in the construction industry used in external wall insulation systems, interior wall decoration environmental protection systems, glass, etc. , in the automotive industry used in automotive body, internal components, window glass, exhaust pipes, engine components, etc. , in other industries, such as applications in heaters, steam pipes, boilers, heat exchangers, chimney flues and so on.
China's weapons industry 59 Research Institute in the thermal reflection insulation coating added color ceramic hollow microbeads, developed a variety of colors of high solar reflection ratio of the coating, this coating is particularly suitable for use on the exterior of the building, but also to meet the energy-saving needs of high-temperature industrial facilities, with a wide range of applications.
source:
research and development and application of thermal insulation coatings, Yao Mengjia, Li Chunfu, He Junbo, Luo Pingya, Hou Yu.
of insulation ceramic coatings on metal surfaces, Sun Yu.
the preparation and performance of thermal insulation coatings, Fang Qi.