| 摘要 |
<p>The specification describes and claims substantially odourless compositions having a pot life after mixing acceptable for use in manufacture and repair of aircraft and which cure at room temperature to provide a mass of heat and aircraft fuel resistant elastomeric material. The compositions comprise components which are at least substantially free of thiol and comprise a fluorocarbon copolymer, organic solvent, metallic oxide, epoxy compound and as crosslinking agent a diamino silane according to the general formula (i) namely
<CHEM>
<??>Examples disclose compositions formed from admixture of two components comprising Viton A, methyl ethyl ketone, magnesium oxide, Epikote 828 and N-beta(aminoethyl) gamma-aminopropyl-trimethoxysilane. The compositions are suitable for forming coatings, adhesive bonds and seals, to metal parts of titanium and aluminium alloys which have resistance to aviation fuels and high temperatures. A primer composition for promoting adhesion especially to titanium alloys is described and comprises organic material having isocyanate and hydrolysable silane groups available for reaction e.g. a mixture of polyfunctional isocyanate and a hydrolysable silane of the general formula (ii) namely
<CHEM>
A preferred example primer comprises liquid MDI and gamma-glycidoxy propyl-trimethoxy-silane. </p> |
