Polyurethane composite materials can significantly improve the energy-saving indicators of doors and windows

With the advancement of China's "dual carbon" goals, the door and window industry has put forward higher requirements for energy-saving design indicators, especially for applications in ultra-low energy buildings and near zero energy buildings. Therefore, fiberglass reinforced polyurethane profiles with the characteristics of thermal insulation, lightweight and high-strength, good fire resistance, and durability without deformation have received high attention in the door and window industry, and are known as revolutionary innovative materials in the door and window industry.

Fiberglass reinforced polyurethane material
       Fiberglass reinforced polyurethane material is a polyurethane composite material made by combining glass fiber and polyurethane resin, processed through advanced extrusion technology.
Fiberglass reinforced polyurethane composite materials (hereinafter referred to as polyurethane composite materials) were widely used in high-end manufacturing fields such as automotive lightweighting, high-speed rail sleepers, wind turbine blades, aerospace, etc. in the early days due to their high strength, good toughness, high impact strength, and good wear resistance. Now, when used for doors and windows, their overall performance can be greatly improved, significantly improving the energy-saving indicators of doors and windows, thereby meeting the requirements of building energy conservation.

Polyurethane low-carbon energy-saving door and window corners

Excellent performance of polyurethane composite materials
       Good insulation performance. Polyurethane composite profiles have a low thermal conductivity [0.34W/(m · K)], only about 1/700 of aluminum alloy, making them excellent insulation materials. The polyurethane composite 95 series doors and windows have a profile U-value of only 0.68, and there is no need to add a bridge breaking configuration. A three glass two cavity glass with a K value of 0.8W/(㎡· K) can achieve a heat transfer coefficient of 0.91W/(㎡· K) for the entire window.

       Good dimensional stability. The expansion coefficient of polyurethane composite material is 0.64 × 10-5K-1, with the closest coefficient of expansion to concrete, high stability and resistance to cement corrosion. The doors and windows made of polyurethane composite materials have experienced a temperature difference of several tens of degrees in winter and summer, and the deformation size difference between the window frame and the wall is extremely small. This can avoid gaps between the window frame and the wall due to thermal expansion and contraction differences, further improving the sealing and insulation performance of the doors and windows. Therefore, the polyurethane composite system has a good sound insulation effect on windows, with a sound insulation performance of ≥ 42dB.

       Good fire resistance. Fiberglass reinforced polyurethane doors and windows only require simple fire prevention measures and are equipped with fire-resistant glass, and the doors and windows produced can meet the fire resistance requirements. Compared to aluminum alloy and plastic steel doors and windows, the combustion characteristics of fiberglass reinforced polyurethane profiles endow fiberglass reinforced polyurethane doors and windows with excellent fire resistance. The polyurethane composite material is mainly composed of non combustible material fiberglass, with a melting point of over 1000 ℃. It has good fire resistance and does not require steel lining, which can meet the energy-saving design requirements and also meet the fire resistance integrity of the entire window for 0.5-1.5 hours.

        High strength. Polyurethane composite has a low density, 25% lighter than aluminum alloy, but its bending strength is 5 times that of aluminum alloy. Its ultra-high strength makes its profile section 10% smaller than that of aluminum alloy, making it suitable for high permeability doors and windows, greatly improving home visibility.

       Good aesthetics. The surface of polyurethane composite material adopts high-end environmentally friendly water-based polyurethane coating, which is widely used in the high-end automotive field, and has rich colors, excellent weather resistance performance, and impact resistance.

       Clean production has lower carbon emissions. In the manufacturing process of aluminum materials, electrolysis and multi-step melting are both highly energy consuming processes, while the glass fiber manufacturing of glass fiber reinforced polyurethane only goes through one high-energy melting process, and the series of chemical reaction processes also determine the low energy consumption characteristics of the polyurethane resin manufacturing process. In terms of mechanical properties, polyurethane replaces aluminum and has the advantage of ultra-high strength; In terms of manufacturing energy consumption, using polyurethane extruded profiles instead of aluminum can significantly reduce carbon emissions. According to carbon emissions calculations, the carbon emissions during the manufacturing process of fiberglass reinforced polyurethane profiles are only 1/8 of those of aluminum alloy profiles.

Polyurethane composite materials can be widely used in the field of doors and windows

Polyurethane composite materials can significantly improve the insulation and fire resistance performance of building curtain wall doors and windows, making the entire window highly efficient, energy-saving, good fire resistance, sound insulation and noise reduction, lightweight and high-strength, stable size, and resistant to chemical corrosion. It is a new generation of energy-saving curtain wall doors and windows products.

       Polyurethane composite frames, polyurethane composite insulation strips, polyurethane sealant for doors and windows, waterproof and breathable films, air barrier films, pre compressed expansion sealing belts, high-density polyurethane insulation pads and other products can be widely used in the field of doors and windows.

       In the future, polyurethane low-carbon energy-saving windows will become a hot topic of concern in the door and window industry. With the improvement of building quality in our country, ultra-low energy consumption buildings will also become a typical representative of high-quality residential buildings, and materials that have gone through the test of time are good materials. Fiberglass reinforced polyurethane profiles are very suitable for high-quality buildings and ultra-low energy consumption buildings, and will play a positive role in promoting the development of China's building door and window industry.

       This article was originally published in the 7th edition of China Building Materials News on December 25th, titled

"Polyurethane composite materials can significantly improve the energy-saving indicators of doors and windows"