Polyurethane material based on modified alumina filler and preparation method thereof

Abstract

The invention relates to a polyurethane material based on a modified alumina filler and a pouring method of the polyurethane material, and the polyurethane material comprises the following componentsin parts by weight: 30-50 parts of a polyurethane prepolymer, 10-40 parts of a filler, 3-5 parts of a curing agent and 5-15 parts of a plasticizer, wherein the filler is graphene modified nano aluminum oxide, and is prepared from acidified graphene and nano aluminum oxide through an esterification-like reaction. According to the preparation method provided by the invention, the graphene modified nano aluminum oxide is used as a filler to be added into the polyurethane, and the layered structure of the graphene enables the filler and the resin to be mixed more fully; the process provided by theinvention is simple in steps, stable in resin pouring performance in the preparation process, uniform in material and suitable for pouring operation; the prepared polyurethane casting material has high temperature resistance and excellent tensile strength.

Description

technical field [0001] The invention belongs to the technical field of casting resins, in particular to a polyurethane material based on modified alumina filler and a preparation method thereof. Background technique [0002] Epoxy-based castable resins have a longer pot life and are mostly used for weaving medium and large volume parts, while polyurethane-based cast resins have a shorter pot life, so these castable resins are used for small volume Molded parts, due to the large number of components, the existing castable materials are more brittle after curing, have lower impact resistance, and the electrical and thermal conductivity also need to be improved. Alumina (Al 2 o 3 ) is usually used as a filler in the resin pouring process, with a small amount of addition, low viscosity of the system, and easy defoaming and pouring. However, when conventional alumina is used directly as a filler, it may cause delamination with the resin, resulting in internal inhomogeneity, int...

AI Technical Summary

Problems solved by technology

Alumina (Al 2 o 3 ) is usually used as a filler in the resin pouring process, with a small amount of addition, low viscosity of the system, and easy defoaming and pouring. However, when conventional alumina is used directly as a filler, it may cause delamination with the resin, resulting in internal inhomogeneity, internal and surface voids etc.

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