Modified phenolic foam and preparation method thereof

Abstract

The invention discloses a modified phenolic foam and a preparation method thereof. The modified phenolic foam is prepared from the following components by weight: 100 parts of a resol resin, 3 to 15 parts of a toughening modifier, 5 to 15 parts of a foaming agent, 3 to 10 parts of a surfactant, 5 to 15 parts of a curing agent, 0.5 to 5 parts of a glass fiber and 0.2 to 3 parts of a lamellar compound which is preferably organically modified montmorillonite. According to the invention, a polyurethane performed polymer is used as the toughening modifier, the glass fiber and the lamellar compound are introduced for modification of phenolic foam, so toughness of the phenolic foam is improved, and the disadvantages of easy efflorescence and scaling-off, fragility, small strength, no ductility and high water absorption of the phenolic foam are overcome; thermal stability and flame retardation of the phenolic foam are improved; and thus, the modified phenolic foam is an upgrading product for external wall insulation materials. Moreover, toughening of the polyurethane performed polymer and phenolic foaming and curing are carried out at the same time, operation is simple and easily practicable, so the method is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the field of phenolic foam insulation materials, in particular to the preparation of polyurethane toughened, glass fiber and layered compound reinforced flame-retardant modified phenolic foam. Background technique [0002] Thermal insulation materials have been widely used in the fields of industry, petrochemical, national defense and construction because of their unique properties of heat preservation, heat insulation, fire prevention, water resistance and noise insulation. Phenolic foam has low density, light weight, low thermal conductivity, wide temperature range and good dimensional stability. Compared with PS foam, PE foam and PU foam, it has the advantages of excellent flame retardant, self-extinguishing, low smoke, flame penetration resistance, etc. However, the shortcomings of phenolic foam insulation materials, such as high brittleness, easy pulverization, low mechanical strength and high water absorption rate, will ...

AI Technical Summary

Problems solved by technology

The phenolic foam prepared by the above three methods all have the effect of no slag dropping and toughening, but it is difficult to maintain its excellent mechanical properties and flame retardant properties

In fact, pure phenolic foam is difficult to burn and has strong thermal stability. After polyurethane is toughened and modified, the introduced flexible segment itself has poor thermal stability, and the addition of polyurethane prepolymer also introduces polyurethane The flammability of the foam reduces the fire resistance of the modified phenolic foam, and the addition of flexible chains reduces its mechanical properties

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