As China proposes to achieve carbon peak in 2030 and carbon neutrality in 2060, it is a once-in-a-lifetime opportunity for the door and window industry to put forward higher requirements for energy-saving design indicators of doors and Windows, ultra-low energy buildings and near-zero energy buildings will also have more applications to promote the innovation and development of doors and Windows enterprises and make the industry achieve healthy development. Therefore, glass fiber reinforced polyurethane profiles with thermal insulation, light weight, high strength, good fire resistance and durable and non-deformation characteristics have been highly concerned in the door and window industry, known as the revolutionary material innovation of the door and window industry.

First, what is glass fiber reinforced polyurethane material
It is a polyurethane composite made of glass fiber and polyurethane resin by advanced pultrusion process. Glass fiber reinforced polyurethane composite material (hereinafter referred to as polyurethane composite) early because of high strength, good toughness, good impact strength, good wear resistance, widely used in automotive lightweight, high-speed rail sleeper, wind power blades, aerospace and other high-end manufacturing, now used in doors and Windows to greatly improve the overall performance, to provide a better material choice for energy-saving doors and Windows. It can significantly improve the energy-saving index of doors and Windows and meet the requirements of building energy conservation.

Second, the specific performance of the excellent performance of polyurethane composites

1, polyurethane composite insulation performance is good
Polyurethane composite profiles have a very low thermal conductivity (0.34W /m•k), only about 1/700 of aluminum alloy, is an excellent insulation material. Polyurethane composite 95 series doors and Windows, the profile U value is only 0.68, there is no need to add the broken bridge configuration, the K value is 0.8 of the three glass two cavity glass, the whole window heat transfer coefficient K value can reach 0.91 W/㎡· K.

2, polyurethane composite dimensional stability is good
The expansion coefficient of the polyurethane composite is 0.64 (10-5K-1), which is the closest to the expansion coefficient of concrete, with high stability and cement corrosion resistance. The doors and Windows made after tens of degrees of temperature difference in winter and summer, the deformation size difference between the form and the wall is very small, to avoid the gap between the window frame and the wall due to the difference in thermal expansion and contraction, and further improve the sealing and thermal insulation and sound insulation performance of the doors and Windows. Therefore, the polyurethane composite system window is super soundproof, and the sound insulation performance is ≥42dB.

3, polyurethane composite has good fire resistance
Glass fiber reinforced polyurethane doors and Windows only need simple fire prevention measures and equipped with refractory glass, the doors and Windows can meet the fire resistance requirements, compared with aluminum alloy and plastic steel doors and Windows, glass fiber reinforced polyurethane profiles when burning characteristics give glass fiber reinforced polyurethane doors and Windows congenital excellent fire resistance. With non-combustible material glass fiber as the main component, polyurethane composite melting point up to 1000℃ above, itself good fire resistance, no steel lining, both to meet the energy-saving design needs, but also to meet the whole window fire integrity of 0.5-1.5 hours.

4, polyurethane composite strength is high
The density of polyurethane composite is small, 25% lighter than aluminum alloy, but the bending strength is 5 times that of aluminum alloy, and the ultra-high strength makes its profile section 10% smaller than aluminum alloy, which can do high permeability doors and Windows, greatly improving the home vision.

5. Good appearance of polyurethane composite
Polyurethane composite surface with high-end environmental protection waterborne polyurethane coating, widely used in high-end cars, rich color, excellent weather performance, impact resistance.

6. Cleaner production has lower carbon emissions
In the aluminum manufacturing process, electrolysis and multi-step melting process are extremely energy consuming processes, while the glass fiber manufacturing of glass fiber reinforced polyurethane only goes through a high-energy melting process, and the serialized chemical reaction process also determines the low energy consumption of the polyurethane resin manufacturing process. In terms of mechanical properties, the use of polyurethane instead of aluminum has the performance advantage of ultra-high strength, and in manufacturing energy consumption, the use of polyurethane pultrusion profiles instead of aluminum can produce significant carbon emission reduction. Measured carbon emissions: the carbon emissions in the manufacturing process of glass fiber reinforced polyurethane profiles are only 1/8 of that of aluminum profiles.

Material innovation has greatly improved the thermal insulation and fire resistance of building curtain wall doors and Windows. The whole window has the comprehensive characteristics of high efficiency and energy saving, good fire resistance, sound insulation and noise reduction, light weight and high strength, stable size, chemical corrosion resistance, etc. It is a new generation of energy-saving curtain wall doors and Windows products.

Polyurethane composite curtain wall keel is also the best profile choice for energy-saving curtain wall, the upgraded second-generation curtain wall system has good thermal insulation, good economy, better appearance, and more convenient installation.

Third, a variety of polyurethane materials in the field of doors and Windows
Diversified applications of polyurethane materials in the field of doors and Windows: polyurethane composite frame, polyurethane composite heat insulation strip, polyurethane doors and Windows perfusion glue, waterproof breathable film gas insulation film, pre-compressed expansion sealing belt, high-density polyurethane heat insulation pad and other products.

Iv. Future Outlook
In the future, polyurethane low-carbon energy-saving Windows will become the focus of attention in the door and window industry. With the accelerated improvement of China's building quality, ultra-low energy consumption buildings will also become a typical representative of high-quality residential buildings, and materials that have passed the test of time are good materials. Glass fiber reinforced polyurethane profiles are very suitable for high-quality buildings and ultra-low energy consumption buildings. It will play a positive role in promoting the development of China's building doors and Windows industry.