| 摘要 |
The method of the present invention can continuously provide rigid synthetic resin foam boards and rigid synthetic resin foam siding materials comprising rigid synthetic resin foams having good dimension stability. The polyol composition of the present invention shows good dispersion stability and has an effect that it can be used without any trouble even after a long time of standing. The present invention provides a method of producing a heat insulating board comprising two facings and a core made of a rigid synthetic resin foam, which comprises spraying or injecting a foam mix for the rigid synthetic resin foam into the space between the opposed facings and expanding and curing the foam mix, wherein the foam mix comprises the following polyol (V), a polyisocyanate, a foam stabilizer, a catalyst and a blowing agent: polyol (V): a polyol containing the following polyether polyol (X), the following amine-type polyol (Y) and at least 0.01 wt%, based on the total weight of the polyol (V), of fine polymer particles stably dispersed in the polyol (V); polyether polyol (X): a polyether polyol having a hydroxyl value of at most 84 mgKOH/g and an oxyethylene group content of at least 40 wt%; and amine-type polyol (Y): a polyether polyol which is obtained by adding a cyclic ether to an amine compound and has a hydroxyl value of from 250 to 900 mgKOH/g. |
