Polyurethane can be found in many of the products that we use in daily life. Polyurethane is used in many important sectors and products, such as automotive, insulation, furniture, shoes, transport, cooling, textiles, food packaging, electronics, paint, industrial parts manufacturing and health (bio-compatible). The use of polyurethane in the construction sector has witnessed a recent rise, in line with increasing demand.
Polyurethane is acquired as a result of a chemical reaction between Methyl Diisocyanate and Poliol. Polyurethane was synthesized and produced for the first time in 1937 by German scientist Otto Bayer, and was first produced as a rigid foam in 1947 and as elastic foam in 1954.
Today, over 11,000 products are made from polyurethane, having gained popularity in the 1960s in the automotive sector, and entering into our lives at the beginning of the 1970s in household-type refrigerators.
RIGID POLYURETHANE FOAM AND THE CONSTRUCTION SECTOR
When the two chemical compounds of Poliol and MDI (Methyl Diisocyanate) come together, the mixed material dilates and forms rigid foam polyurethane after hardening.
Rigid polyurethane foam, which is produced in line with European EN 2653 standards, can take on a cellular structured, closed celled, low density insulation and construction material form with the addition of special accelerants and cell regulators in the production process, and also with the help of flame retardant agents and auxiliary materials. The material, which offers low thermal transmittance based on the properties introduced into the cell capsules by inflating agents, ensuring perfect thermal insulation.
The material can be applied through casting or spraying for cold storage insulation applications, and for the insulation of FLOORS, WALLS, TERRACES and ROOFS in buildings, and is gaining popularity in these applications every day. It is both light and durable, and is also is thinnest and most efficient insulation material.
In energy policies developed with a view to reducing global warming, the principle “all kinds of energy and natural resources should be most rationally preserved”, brings rigid polyurethane foam to the forefront as the “most perfect insulation material in the world”.
GENERAL PROPERTIES OF POLYURETHANE
- Polyurethane has a steady cell and foam structure, and 90–95% of its cells are enclosed, which is the reason for its perfect heat insulation properties. It is the best known insulator in the world.
- It is the foam with the lowest thermal transmittance ratio (λ = 0.0023 Watt / Kh).
- It can be produced with utilization densities of between 3,040kg/m³ and 1,200kg/m³.
- It ensures sound insulation of up to 50 decibels.
- It is a good humectant, and sticks to surfaces easily.
- The model alternatives are infinite, since it can act like a liquid and can take the form of the surface to which it is applied
- It can be raised from a B3 degree of incombustibility to B2 and B1.
- Polyurethanes have high dimensional stability
- It does not expand within a temperature range of -30 to +80°C, and does not come out of the surface it has stuck on.
- Polyurethanes are long lasting as insulation and decoration materials.
- Over the first 15 years, only a 10% depreciation can be seen in insulation values, and only 15% occurs in 30 years.
- Polyurethanes are hygienic and modern technological products that do not produce bacteria, and do not decay or give off odors. In this respect, they can be considered green products.