In recent years, polyurethane resins have made their composites stand out due to their good toughness, fast curing, and no styrene fumes. With people’s mastery of polyurethane molding technology and progress in controlling its reactivity to extend its pot life, polyurethane has entered the field of composite materials dominated by unsaturated polyester and vinyl ester resins for a long time.
In the past, polyurethane composites were mainly automotive interior parts and exterior parts molded by the structural reaction injection method (SRIM), such as pickup truck boxes, floor panels, luggage racks, inner door panels, etc. (polyurethane is foamed). However, in recent years, polyurethane composite materials have developed technologies such as pultrusion, winding, vacuum infusion, and long-fiber injection. Non-foamed polyurethane composite materials are mainly used to make window frames, bathtubs, light poles, trucks, and off-road vehicles. Large parts etc.
Polyurethane pultrusion: Polyurethane pultrusion generally has low viscosity, moderate to high reactivity, good impact strength and toughness, and short beam shear properties.
Compared with other materials, the use of polyurethane pultrusion can produce many benefits. It can increase the content of glass fiber in the product and greatly increase the strength of the product. For example, using glass fiber and polyurethane resin to pultrude the window frame, the strength of the resulting window frame is 8 times higher than that of the PVC window frame, and its conductivity is 40 times lower than that of aluminum, so the insulation performance is much better. At the same time, because polyurethane pultruded window frames are less brittle, they will not crack and are durable.
High-performance polyurethane/glass fiber composite material is a kind of high-strength, high-modulus, lightweight polymer composite material produced by continuous pultrusion process with high-hardness polyurethane elastomer as the matrix material, glass fiber as the reinforcing material .
Polyurethane pultrusion technology products not only have higher strength and better thermal insulation effect than traditional materials, but also are lighter and more environmentally friendly. Its application fields are very wide. From the original gorgeous bathtub, to surfing and snowboarding, to today’s innovative applications such as window frames and container floors, polyurethane composite materials have been integrated into all aspects of our daily lives.
According to reports, in the past few years, China’s demand for composite materials has shown a gradual increase. Composite material is a high-tech material that integrates the characteristics of several materials into an all-round solution with outstanding new performance. It is precisely because of the unique properties of the material, such as light weight, high strength and rigidity, and the ability to help achieve higher cost efficiency and ecological responsibility, so polyurethane composite materials have attracted the attention of various industries. Especially in the construction and transportation industries, innovative technologies and applications have attracted much attention.