Polyurethane composite materials are constantly expanding their applications in various fields because of their excellent physical properties and chemical stability.：
1. Door and window system
One of the latest applications of polyurethane pultruded materials is door and window systems.This material can make larger, thinner and strong profiles for large window frames and even curtain walls.Compared with traditional aluminum, wood and plastic window frames, polyurethane window frames have good expansion and contraction properties and weather resistance, and their appearance can be painted to form a wooden appearance.
2. Railway sleeper
Polyurethane composite materials are also used in the manufacture of railway sleepers.Sekisui Chemical of Japan has successfully used it in railway construction, and the polyurethane resin used comes from Covestro.This kind of sleeper looks like wood, combining all the advantages of natural products and modern design, with a low coefficient of thermal expansion and thermal conductivity, as well as high compressive, tensile, and bending strength.In addition, it absorbs very little water in heavy rains, does not affect the electrical insulation properties, and its weight and on-site processing performance are better than concrete.
3. Winding and forming telegraph poles
In winding molding, the application of polyurethane composite materials has aroused great interest from suppliers.Assembled composite poles were manufactured using proprietary polyurethane resin and fiber winding patented technology. This is the first polyurethane composite pole.The inner layer of this kind of telegraph pole is made of aromatic polyurethane, and the outer two layers are made of aliphatic polyurethane. The strength and toughness of this resin system are higher, and the weight is reduced by 45%.
4. Automotive industry application
The application of polyurethane composite materials in the automotive industry is also increasing.For example, VFI (variable fiber injection molding) technology directly disperses the glass fiber untwisted roving into the mixing chamber, and then infuses it into the mold together with the polyurethane to cure and form.Compared with the S-RIM process, VFI high-density products have better performance.LFI (long fiber injection molding) technology is mainly used to produce interior parts of vehicles with low mechanical properties but more complex designs, such as dashboards, interior panels, and body panels.
5. Infrastructure construction
The growth of the infrastructure industry in the Asia-Pacific region, especially in the fields of social infrastructure and transportation infrastructure, is expected to drive the development of the polyurethane composite material market.Composite materials are increasingly used in civil infrastructure and building materials. For example, composite structural heat insulation panels used in temporary housing applications are designed and produced using vacuum-assisted resin transfer molding and low-density polyurethane foam.
These new applications demonstrate the versatility and adaptability of polyurethane composite materials, and herald their broad prospects in the future market.With the continuous progress and innovation of technology, the application field of polyurethane composite materials will be further expanded.