| 摘要 |
<p>A two part polyurethane adhesive system and method of using the adhesive to bond polyurethane foams, polystyrene foams, and other substrates. The first part of the adhesive system is a hydrophilic polyurethane prepolymer prepared by reacting a high molecular weight, multi-functional polyol which has been copolymerized randomly from propylene oxide and ethylene oxide, with a diisocyanate or polyisocyanate. This reaction mixture is then diluted with either a flame retardant, a plasticizer, a solvent which is not considered a low flash point volatile organic compound, or a combination of these chemicals. The second part of the adhesive system is an aqueous phase curing agent. In addition to water, the components of the aqueous phase may include a tackifying agent or a catalyst or both. The method of bonding using the adhesive essentially comprises applying the polyurethane prepolymer to one of the substrates which is to be bonded, applying the aqueous phase curing agent to the polyurethane prepolymer, and placing the second substrate in contact with the prepolymer. The prepolymer and the aqueous phase curing agent may be applied sequentially or simultaneously.</p> |
