| 摘要 |
PURPOSE:To obtain a foamed heat-insulation material while reducing the amount of a fluorocarbon blowing agent used by mixing under agitation a specified premix component containing a fluorocarbon blowing agent with a isocyanate component comprising hydrophobic zeolite and an organic polyisocyanate. CONSTITUTION:A foamed heat-insulation material is produced by mixing a premix component comprising a polyether, a foam stabilizer, a catalyst, water and a fluorocarbon blowing agent under agitation with an isocyanate component comprising zeolite rendered hydrophobic by surface treatment with a silicone. According to the above process, the amount of the fluorocarbon blowing agent used can be reduced by effectively utilizing carbon dioxide produced by the reaction of water with the organic polyisocyanate as a blowing gas, and the carbon dioxide remaining in cells can be removed by the gradual adsorption by the hydrophobic zeolite. Therefore, the thermal conductivity of the gas in cells can be decreased to improve the thermal conductivity of the obtained foamed heat-insulation material, so that a foamed heat-insulation material having excellent heat insulating performances can be provided. Therefore, it can contribute to the solution of a fluorocarbon pollution problem and also to the energy saving. |
