| 摘要 |
<p>Spray foams formed from a non-aqueous foamable composition are provided. The foams are formed by destabilizing a colloidal dispersion of dry polymer or resin to allow the coagulatable polymer to form a film aided by a crosslinked structure formed by a crosslinking reactant system having first and second reactants with multiple functional groups that crosslink quickly at or about room temperature. An A-side contains includes a solid, colloid-forming polymer, a multifunctional acid, and a liquid blowing agent as the non aqueous serum phase; and a B-side contains a polyfunctional aziridine crosslinking agent a plasticizer having no acidic protons. The polyfunctional aziridine crosslinking agent may be diluted by a plasticizer, which reduces the viscosity of the B-side. A lack of water or small amount of water in the inventive foam composition permits the foam to be sprayed at temperatures below freezing and to a greater thickness compared to watercontaining compositions.</p> |
