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65DEVELOPMENT OF THERMAL INSULATION MATERIALS WITH LOW THERMAL CONDUCTIVITY ON THE BASIS OF LOCAL RAW MATERIALS
Boburjon Tolibjonovich Tojiboyev
Assistant at Ferghana polytechnic institute
ABSTRACT
The article describes the results of experimental studies on the analysis and improvement of existing methods for determining the thermal conductivity of liquid composite heat-insulating coatings.
Key words and phrases: energy efficiency, thermal insulation material, thermal conductivity, microsphere, thermal insulation paint, stationary method, non-stationary method, thermocouple sensors.
Today, the rational use of heat by reducing energy consumption is one of the most pressing issues in the world. In particular, the efficient use of thermal energy in buildings and structures, heat pipes, energy networks and other areas is important. This is due to the limited availability of energy sources, the high cost of energy and the negative impact it has on the environment as a result of its production.
The use of modern heat-insulating materials, including liquid energy-saving heat-resistant coatings, is an important study in the current era of rising prices and a shortage of traditional energy carriers. In recent years, thermal insulation paints based on hollow ceramics, glass and polymer microspheres have attracted a lot of attention.
At the "Youth Center for Innovative Technologies" of the Fergana Polytechnic Institute, research is being conducted to improve the method of determining the thermal conductivity of ultra-thin thermal insulation coatings.
The coating is designed for thermal insulation, waterproofing, protection against corrosion of thermal and engineering networks, process pipes, thermal energy and capacity equipment, and for thermal insulation and protection of facades and interiors of building structures, residential and industrial buildings.
The coating composition is prepared on the basis of all fillers and other components in the form of acrylic binders and hollow microspheres.
The mechanism of operation of thermal insulators with hollow microspheres, which are part of the composition, is radically different from the mechanism of operation of "classic" heaters. Due to its unique properties, the material has a significant energy-saving effect even at a thickness of 1 mm.
In addition to thermal insulation properties, the coating, which contains waterproof and anti-corrosion additives, also has waterproofing (anti-corrosion) abrasion properties.
The components included make the coating waterproof, flexible and at the same time resistant to ultraviolet, temperature drops, moisture and external factors. Field of application:
- Thermal insulation of external pipes of heating networks, boilers and other equipment;
- Coating of pipes for cold water supply of refrigeration units operating in rooms with poor air temperature to prevent condensation and corrosion;
- for thermal insulation and protection of facades and interiors of residential and industrial buildings;
After drying, the liquid composition turns into a durable, polymer coating, which provides excellent thermal insulation properties that reduce heat loss. The drying layer of one coating layer forms a film with a thickness of 0.1 to 0.5 mm.
The coating is flexible and has high viscosity at low and high temperatures. There is no residue from the base material in the coating and it does not crack during long service life (up to 15 years).
Fig. 1 Results from the experiment
The coating has a high adhesion (adheres to cement-sand plaster, concrete, brick, metal, plastic, wood and other materials), prevents corrosion and condensation on cold surfaces, does not require additional protection from mechanical and atmospheric influences. Vacuum ceramic or silicone balls inside. They are a suspended component in liquid synthetic rubber, acrylic polymers and inorganic pigments.
It resembles a light gray suspension, forming an elastic ultra-thin coating after drying. The combination of such components has allowed to create a unique material with flexibility, lightness, elasticity and the ability to perfectly adhere to surfaces of any shape and almost any chemical composition. Advantages:
- Surkash is easy (can be done by spraying with a brush, roller and compressor);
- Conciseness is reflected;
- Not harmful to nature;
- Does not contain harmful substances;
- Good resistance to both alkalis and acids;
- Does not support combustion;
Areas of application
- Residential and industrial buildings (external and internal insulation);
- Easy-to-install structures;
- Metal structures (garages, containers,);
- Heating mains, pipes, ventilation ducts;
- Shut-off valves (valves and valves);
- Industrial containers;
- Motor showrooms;
- Water transport.
Non-combustible fire-resistant material. There are two other types of resistance that are specific to liquid insulation: temperature and humidity and resistance to ultraviolet radiation. The composition of liquid thermal insulation includes only environmentally friendly components, which allows it to be used indoors and outdoors, in children's institutions, public catering establishments, etc. without restrictions on their functionality.
It is very easy to apply even in places with limited access. There are several ways to apply liquid thermal insulation to the surface you choose. You just have to choose the one that suits you best. You can use a variety of tools: brushes, rollers, and so on. If your surface is concrete, use a brush to clean it of dust, mold, and oil;
- Metal surfaces should also be cleaned and degreased. If there are rust stains on the metal, it is recommended to treat them with a phosphating compound.
- Before applying the insulation, the wood should be primed with primer and biocides.
t^-sirt temperaturasi Fig. 2 Thermal conductivity
- If you are reworking a brick surface, you should first prime it and then plaster it.
Thermal insulation coating is applied to metal, concrete, brick, wood, plastic and many other surfaces. The surface is pre-cleaned, primed when necessary, diluted with water of the same composition (not more than 5%) or any acrylic paint as a primer, liquid glass mixture can be used as a primer.
Do not push the mixture on a damp, icy surface. The mixture is laid in several layers. The number of layers is determined by the tasks, depending on the objectives. Layers can be applied several times with drying intervals. The final thickness of the finished coating is selected depending on the heat carrier temperature and the desired surface temperature.
The coating is easily (laid) on the surface of any geometric shape using a brush, spatula, roller or sprayer. The coating does not emit harmful compounds into the atmosphere. It is recommended to use a normal respirator when working indoors without ventilation, a respirator is not required if outdoors or in a ventilated room. Average consumption to obtain a dry coating layer with a thickness of 1 mm: 750-1000 g / m2.
The inspection was outdoors. The coating is laid in 3 layers. The final thickness was 3 mm. Total coating consumption was 0.9 liters.
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