| 主权项 |
1. A method to insulate a surface or an enclosure by applying to the surface or enclosure a rigid polyurethane foam made from a reactive formulation comprising a mixture of:
(A) an A-side comprising
(i) an organic isocyanate comprising 2,4′-diphenylmethane diisocyanate (MDI), 2,2′-diphenylmethane diisocyanate, 4,4′-diphenylmethane diisocyanate, or mixtures thereof, (B) a B-side comprising:
(ii) an isocyanate-reactive component,(iii) a blowing agent,and(iv) one or more additional component selected from a catalyst, a nucleating agent, a surfactant, a crosslinker, a chain extender, a flame retardant, a filler, a colorant, a pigment, an antistatic agent, reinforcing fibers, an antioxidant, a preservative, an infrared blocking agent, or an acid scavenger, and (C) from 3 to 7 parts carbon black comprising
(v) from 50 to 100 percent by weight of a fluorinated carbon black having a fluorine to carbon (F/C) molar ratio of at least 10/90, wherein parts by weight are based on 100 parts by weight of the B-side component (B) and component (C) may be in either wholly in the A-side (A), wholly in the B-side (B) or a portion in the A-side and a portion in the B-side wherein said rigid polyurethane foam is greater than 90 percent closed-cell according to ASTM D2856-A. |
