| 摘要 |
<p>Polyurethane modified polyurea foams having a finer cell structure and an increased volume of finished product are prepared by reacting crude organic di-or polyisocyanates with a mixture of polyether polyols and an alkylene or dialkyl carbonate in the presence of a tertiary amine catalyst, a silicone surfactant and a blowing agent selected from water, which reacts with the di-or polyisocyanate to generate CO<Sub>2</Sub>, fluorocarbons having a boiling point below 60°C and mixed with water and methylene chloride mixed with water.</p> |
