| 摘要 |
<p>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-butyl aniline) (a4); and - optionally 1 to 5% by weight pigment (a5), the isocyanate component (B) comprising 24- and 4,4'- methylenediphenyldiisocyanate 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.</p> |
