| 摘要 |
A method for preparing a composite material comprising: (i) applying a polyurea system comprising an amine component (A) and an isocyanate component (B) to at least part of a surface of a substrate to form a base coat layer on at least part of the surface of the substrate, the amine component (A) comprising: 5 to 20% by weight of polyetheramine with an average molecular weight of 4800 to 5200 (a1); 50 to 80% by weight of polyetheramine with an average molecular weight of 1900 to 2100 (a2); 2 to 10% by weight of diethylene toluene diamine (a3); 10 to 20% by weight of 4,4′methylene bis (n-sec-butylaniline) (a4); and optionally 1 to 5% by weight pigment (a5), the isocyanate component (B) comprising 2,4- and 4,4′-methylenediphenyl diisocyanate prepolymer; (ii) applying a fabric over at least part of the base coat layer and allowing the fabric to bond to the base coat layer; (iii) applying a polyurethane/polyurea spray foam over at least part of the fabric to form a foam layer; and (iv) optionally applying a polyurethane/polyurea spray elastomer over at least part of the foam layer to form an elastomer layer.
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