Light epoxy foam-based sandwich plate and preparation method thereof

Abstract

The invention relates to a light epoxy foam-based sandwich plate. The plate comprises an exterior panel, an epoxy foam core and an inner skin from outside to inside in sequence, and the epoxy foam core is formed by foaming an epoxy foam-based composite material which is prepared from a two-component system with a component A and a component B at the weight ratio being 100:(30-80), wherein the component A is prepared from 100 parts of epoxy resin, 5-20 parts of flame retardant, 1-10 parts of foaming agent and 0.5-1.5 parts of coupling agent, and the component B is prepared from 1-100 parts of curing agent, 1-10 parts of foaming agent, 0.5-5 parts of flame retardant and 1-10 parts of curing accelerator. Accordingly, the plate is prepared through a secondary on-site foaming process method, byconducting foaming after placing is conducted for 4-24 h at room temperature, reacting is conducted for 1-3 h at 110-140 DEG C, and secondary foaming and curing molding are conducted. Accordingly, integrated completion of filling, encapsulation and bonding can be achieved, the epoxy foam-based sandwich plate is easy to mold and is not limited by the sandwich plate shape and type, the thermal insulation, sound insulation and flame retardant properties are achieved while weight lightening is achieved, no toxic gas is generated in the case of fire, the good environmental-friendly performance isachieved, and the plate can be used for densely populated places.

Description

Technical field [0001] The invention relates to a sandwich panel and a preparation method thereof, specifically a lightweight epoxy foam-based sandwich panel and a preparation method thereof. Background technique [0002] The sandwich panel is composed of a sandwich layer and inner and outer skins. The inner and outer skins are bonded to both sides of the sandwich layer through adhesive respectively; the sandwich layer is a honeycomb core layer or a foam core layer, and the honeycomb core The layer is paper honeycomb core, aluminum honeycomb core or plastic honeycomb core, the foam core layer is polyurethane (PU) foam, phenolic foam and polystyrene foam (EPS) and other foam materials; the sandwich layer is a honeycomb core layer called honeycomb sandwich board, such as figure 1 As shown in the figure, the sandwich layer is a foam core layer and is called a foam sandwich panel. [0003] Honeycomb sandwich panels have the characteristics of good rigidity, high load ratio and...

AI Technical Summary

Problems solved by technology

[0003] The honeycomb sandwich panel has the characteristics of good rigidity, high load ratio and the most economical use of materials. However, due to the convection and heat radiation of the air in the honeycomb cell between the inner and outer skins, the thermal insulation of the honeycomb sandwich panel is not good. Good, with poor thermal insulation performance

[0004] Chinese patent CN103291035A discloses a honeycomb sandwich panel. In this patent, honeycomb aluminum and glass fiber cloth are bonded together to form a honeycomb sandwich panel. The upper and lower skins are bonded and fixed by the adhesive layer and the honeycomb core. The sandwich panel provided by this patent is prone to peeling between the core material and the panel, which affects the mechanical properties

[0005] Chinese patent CN201510108674 discloses a honeycomb aluminum-epoxy resin composite sandwich panel and its preparation method. The sandwich panel is a sandwich panel with a five-layer structure, (1) pure epoxy resin protective surface layer, (2) ring Oxygen resin / honeycomb aluminum composite layer, (3) honeycomb aluminum core layer, (4) epoxy resin / honeycomb aluminum composite layer, (5) pure epoxy resin protective surface layer; the sandwich panel provided by this patent has better rigidity , but the sandwich panel structure has many layers, the manufacturing process is complicated, and the cycle is also very long, and the bonding method between the skin and the sandwich layer is not explained

[0006] Chinese patent CN102198744A discloses a manufacturing method of a phenolic foam-filled honeycomb core reinforced advanced composite material, which is characterized in that the honeycomb impregnated with open-cell phenolic formaldehyde is used as the base material, and the opening position of the base material is filled with foamed phenolic resin and foamed to form phenolic formaldehyde Foam-filled honeycomb core material, and then compound the core material with phenolic fiber reinforced surface material to make phenolic foam-filled honeycomb core-reinforced advanced composite material. , can be widely used in the fields of aviation, ships, and rail transit facilities; The strength of the honeycomb core

However, the manufacturing process of the sandwich composite material is complicated, and the density of the epoxy foam is relatively high, which may easily cause the product to be heavy, and the light weight is insufficient, and the flame retardant performance is not specified.

[0008] Polyurethane insulation materials generally use polyether polyols with high functionality and high hydroxyl value to react with polyisocyanates to form polymers with a cross-linked structure. Polyurethane insulation materials have good dimensional stability, light weight, and thermal conductivity. Low, closed cell rate above 95%, good anti-corrosion and wear resistance, etc.; but in polyurethane rigid foam, the commonly used foaming agent is chlorofluorocarbon (CFC) foaming agent, and chlorofluorocarbon (CFC) foaming agent is harmful to the atmosphere. The ozone layer has a destructive effect; secondly, a large amount of organic solvents and various additives are required in the process of preparing polyurethane foam. As time goes on, the volatile organic small molecule substances (such as: benzene, toluene, etc.) in the foam will continue to volatilize , will cause serious damage to the environment and the human body; in addition, when encountering a fire, the polyurethane rigid foam with a porous structure is easy to ignite, and releases a large amount of toxic gases such as hydrogen cyanide, CO, and NO during the combustion process. When it reaches 400ppm, it can poison people to death, causing great potential harm

Images