Metal-polyurethane-metal sandwich plate material and its manufacturing method

Abstract

The present invention is one kind of metal-polyurethane-metal sandwich plate and its making process. The sandwich plate has one core layer of dense polyurethane elastomer, which is produced with polyol and isocyanate in the weight ratio of 100 to 50-90, and through mixing at 20-40 deg.c, pouring, and curing at room temperature. Two metal surface layers are then adhered firmly to the core layer to form the metal-polyurethane-metal sandwich plate. The technological process with room temperature curing may be completed in site, so that the present invention has wide application range in serving as structural material for ship, bridge, high rise building, etc.

Description

technical field [0001] The present invention relates to a composite structural material, and more particularly to a metal-polyurethane-metal sandwich plate that can be used as a structural material and a manufacturing method thereof. technical background [0002] The polyurethane-metal sandwich panel is a composite structure of metal, polyurethane elastomer and metal formed by injecting polyurethane elastomer between two metal plates, and firmly bonding the polyurethane elastomer core material and the inner surface of the metal. Compared with the steel plate, the sandwich plate has the advantages of simple structure, light weight, convenient processing, impact resistance, fatigue resistance, shock absorption, noise reduction, heat insulation, etc., and can be used as a structural component that can withstand large external forces, replacing steel components. It has a wide range of application prospects in the fields of ships, bridges, bridges, high-rise buildings, undergroun...

AI Technical Summary

Problems solved by technology

This technology still has the following deficiencies: (1) in order to achieve the flame retardant requirements of composite components, it is necessary to add 5 to 50% by weight of flame retardants

These added materials exist in the liquid polyol in solid form and are easy to settle, resulting in uneven polyol components and affecting the performance of the core material

It may even lead to blockage of pipelines and prevent normal construction; (2) In order to ensure that the polyurethane core material and the metal panel are firmly bonded, the metal plate needs to be sandblasted before use. This technology is limited by the size of the composite components and the construction form. Under the conditions of large component size and on-site construction, this process cannot be implemented normally; (3) In order to ensure the performance of the core material polyurethane, it needs to be reacted at 50-150°C

This reaction condition increases the difficulty of on-site construction. In actual operation, especially in the manufacture of large structural parts, this temperature condition is difficult to achieve. Even if it can be achieved, it will consume a lot of energy and require additional auxiliary equipment; (4) This technology adopts the same pouring speed in the pouring process. Since the pouring rate is usually about 200Kg / min, the pouring speed is relatively fast, which may easily cause air bubbles to be generated due to poor exhaust at the exhaust port. At the same time, due to the fast pouring speed, the pouring speed The impact between the material and the metal panel is also prone to air bubbles