| abstract |
The invention discloses a kind of material and its rigid foam preparation method for manufacturing rigid foam, it is characterized in that：Take 2.8~3.0, viscosity as 7000~10000 mPaS at 25 DEG C, the mgKOH/g of hydroxyl value 380~450, the PEPA that acid number is 0.1~2 mgKOH/g of high functionality, isocyanates, catalyst 1 # , catalyst 2 # Physical blowing agent, foam stabiliser, and crosslinking agent etc. is raw material, foam stabiliser is used to be compounded for two class organic silicon surfactants, efficient emulsification, two big key technologies of nucleation during rigid foam is processed combine, and prepare compressive strength and bending strength not less than 500KPa, size changing rate（80 DEG C, 48h）Rigid foam not higher than 0.4%.The rigid foam is widely used in the fields such as refrigerating plant and equipment such as building materials, communications and transportation, refrigerator, jelly storehouse. |