Continuous glass fiber reinforced polyurethane microporous foaming profile pultrusion process and product and pultrusion system thereof

Abstract

The invention discloses a continuous glass fiber reinforced polyurethane microporous foaming profile pultrusion process and a product and a pultrusion system thereof. The continuous glass fiber reinforced polyurethane microporous foaming profile comprises the following components of, in parts by mass, 70-80 parts of polyether polyol, 15-20 parts of polyester polyol, 1-3 parts of crosslinking agent, 0.5-1.5 parts of catalyst, 1-3 parts of surfactant, 1-4 parts of microcrystalline cellulose, 0.2-3 parts guanidine oligomer and 95-105 parts of isocyanate; and the reinforcing material adopts continuous glass fiber after surface activation pretreatment. According to the continuous glass fiber reinforced polyurethane microporous foaming profile pultrusion process and the product and the pultrusion system thereof, the problem of high-speed curing polyurethane glue dipping is solved, the polyurethane is fully foamed under the pressure-free state to obtain the microporous foaming polyurethane profile which is light, high in strength, high in toughness, high in holding nail force and capable of be permanently flame-retardant, antibacterial, mildew-proof and corrosion-proof, the profile can beused for high-speed railway sleepers, and the process is the only technology capable of realizing continuous fiber reinforced polyurethane pultrusion microporous foaming.

Description

technical field [0001] The invention relates to the technical field of polyurethane composite material preparation, in particular to a continuous glass fiber reinforced polyurethane microcellular foaming profile pultrusion process and product and a pultrusion system. Background technique [0002] Polyurethane (PU) foam materials have been widely used in all aspects of daily life, such as refrigerator insulation, shoe soles, building wall panels, mattresses, automotive interior parts, etc. According to different formulas and processes, it can usually be divided into soft foam, semi-rigid foam, and hard foam PU materials. Among them, hard foam PU has high strength, good toughness, and compact structure. By introducing reinforced modified materials, such as glass fiber and carbon fiber, Its strength can be greatly improved, and it can be made into a structural material with high stress resistance, light weight and high strength. [0003] At present, although there is also a pu...

AI Technical Summary

Problems solved by technology

However, due to the limitations of the process conditions, the polyurethane raw material is forced to be squeezed between the reinforcing fibers by high pressure, forcing the air that cannot be discharged to be squeezed between the reinforcing fibers and the resin, forming a poor interface bond. This process not only leads to The mechanical properties of the finally obtained reinforced polyurethane profiles are poor, and polyurethane cannot be foamed at all under high pressure, so reinforced polyurethane microcellular foamed profiles cannot be obtained

The obtained material not only has a high density, but also seriously lacks toughness, does not have the feeling of super strong wood at all, and has a single performance, and does not have good flame retardancy, mildew resistance, and corrosion resistance, which further limits its application.

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