A kind of fiber-reinforced polyurethane hard foam synthetic board with high fiber content and its manufacturing method

Abstract

Provided are a high-fiber-content fiber-reinforced rigid polyurethane foam composite panel and method for manufacturing same; polyurethane resin is employed as a matrix material; comprised are a hybrid polyether polyol, a fire retardant, a hard-foam stabilizing agent, a coupling agent, a catalyst, a blowing agent, an antioxidant, an anti-UV agent, and isocyanate; fiber is employed as a reinforcing material and its content is greater than 60%. Using such technical means as a low-hydroxyl and low-functionality hybrid polyether polyol and a coupling agent solves the problem of insufficient impregnation of polyurethane resin with reinforcing fiber, thereby increasing the reinforcing-fiber content; it is thus possible to manufacture a fiber-reinforced rigid polyurethane foam material product having a density higher than 840 kg / m3 and a reinforcing-fiber content of more than 60%, compensating for the technical deficiency of fiber-reinforced polyurethane hard-foam composite panels, making their product specifications and performance more diverse, and satisfying different technical requirements.

Description

technical field [0001] The invention belongs to the technical field of polymer composite materials. The invention relates to a high-fiber-content fiber-reinforced polyurethane rigid foam composite sheet, in particular to a high-fiber-content fiber-reinforced polyurethane rigid foam sheet used in the fields of bridges, railways, light rails and subways. Foam synthetic boards and their manufacturing methods can also be extended to municipal construction, chemical industry, ships, armored vehicles, trucks and other fields as walkway boards, and can be used as composite sleepers in heavy-duty railways, ordinary railways, open bridges, turnouts, etc. use. Background technique [0002] At present, the boards used in bridges, railways, light rails and subways, such as sidewalk boards, cable trough covers, sleepers, etc., are mostly made of reinforced concrete or reactive powder concrete. The products are heavy and difficult to construct; Beautiful, after long-term use, the product...

AI Technical Summary

Problems solved by technology

Some are replaced by glass fiber reinforced plastic materials, but in the production of glass fiber reinforced plastic materials, a large amount of powder is added. After being exposed to the sun and rain, it is easy to appear pulverization, the quality is unstable, and the product has poor weather resistance and aging resistance. After use, there are potential safety hazards. At the same time, the weight of the product is heavy, and the construction is relatively difficult. If the FRP material is made into a hollow structure, its mechanical properties will be greatly reduced, especially the pull-out strength of the bolts is too low, and there are potential safety hazards. Generally, 5~ must be replaced in 10 years

Some fiber-reinforced polyurethane foam materials are used, but their fiber content is low and their strength is low. During the strength test of heavy-duty railway and ordinary railway sleepers, serious collapse occurred. It is not suitable for application in heavy-duty railways and ordinary railways. In light rail and subway railway lines at home and abroad

[0003] At present, the fiber-reinforced polyurethane foam materials researched at home and abroad are all made of polyether polyol and isocyanate. It can be cured in about 10 minutes, and the selected polyether polyol has high viscosity and poor fluidity. It is difficult to solve the problem of uniform impregnation of polyurethane and fiber before polyurethane curing. Therefore, fiber reinforced polyurethane foam products currently produced at home and abroad The content is low, and the impregnation of polyurethane and fiber is uneven, the local polyurethane content is high, the foam is large, the local fiber content is high, and dry yarn phenomenon occurs, resulting in low strength of the material, uneven strength and unstable quality

Moreover, due to its low fiber content and high resin content, during production, the resin foams and expands to produce a large amount of flash, which not only causes product waste, increases production costs, but also causes great damage to equipment and molds.

Not only that, but because it cannot solve the impregnation problem of polyurethane and fiber, it has not produced fiber-reinforced polyurethane foam products with higher glass fiber content, nor has it produced higher-density fiber-reinforced polyurethane with higher glass fiber content. Foam Products

At present, there is no report and there is no density higher than 840kg / m in the market 3 Fiber-reinforced polyurethane foam materials and products with a fiber content higher than 60%

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