摘要:
Disclosed herein is a process for producing rigid polyisocyanurate foams, where (a) aromatic polyisocyanate, (b) isocyanate-reactive compounds including at least one polyetherol (b1) and/or polyesterol (b2), wherein where the number-average content of isocyanate-reactive hydrogen atoms of components (b 1) and (b2) is at least 1.7, (c) catalyst, (d) blowing agents, (e) flame retardants, (f) optionally auxiliary and additive substances and (g) optionally compounds having aliphatic hydrophobic groups and not falling under the definition of compounds (a) to (f) are mixed to afford a reaction mixture and allowed to cure to afford a rigid polyisocyanurate foam. Further disclosed herein is a rigid polyisocyanurate foam obtainable by the process.
摘要:
A process for producing rigid polyurethane foams or rigid polyisocyanurate foams is provided. The process contains the reaction of polyisocyanate, fatty acid modified polyetherpolyol, polyetherpolyol, optionally flame retardant, blowing agent, catalyst, and optionally further auxiliary and/or admixture agent, wherein the polyetherpolyol is obtained by a process containing reacting orthotolylenediamine and optionally further co-starters with alkylene oxide containing ethylene oxide wherein the ethylene oxide content is more than 20 wt %, and then reacting the reaction product with alkylene oxide containing propylene oxide wherein the 1,2-propylene oxide content is more than 20 wt %, in the presence of a catalyst.
摘要:
Disclosed herein is a method for preparing rigid polyurethane foams, in which method (a) polyisocyanates are mixed with (b) compounds having at least two hydrogen atoms that are reactive with isocyanate groups, (c) optionally a flame retardant, (d) a blowing agent, (e) a catalyst, and (f) optionally auxiliary agents and additives, to form a reaction mixture and are cured to provide the rigid polyurethane foam. Further disclosed herein are a rigid polyurethane foam obtained by the method and a method of using the rigid polyurethane foam in the manufacture of sandwich elements.
摘要:
The present invention relates to a process for producing rigid polyisocyanurate foams, wherein (A) polyisocyanates are mixed with (B) compounds having isocyanate-reactive hydrogen atoms, (C) flame retardants, (D) blowing agents, (E) catalyst at an isocyanate index of at least 220 to afford a reaction mixture and cured to afford the rigid polyisocyanurate foam, wherein the component (B) comprises at least one aromatic polyester polyol (b1) and at least one polyether polyol (b2), the polyester polyol (b1) has an average total functionality of ≤3.0 and ≥1.7 and the polyether polyol (b2) has a hydroxyl number of 160-350 mg KOH/g and is produced by alkoxylation of a starter or starter mixture having an average total functionality ≤3.5 and ≥1.5, wherein as the alkylene oxide for producing polyether polyol (b2) at least 80%by weight of ethylene oxide is employed and comprises at least 90% primary hydroxyl end groups and wherein the mass ratio of the component (b1) to component (b2) is ≤3 and ≥1 and the blowing agent (D) comprises chemical and physical blowing agents, wherein the chemical blowing agent is selected from the group consisting of formic acid-water mixtures and formic acid. The present invention further relates to a rigid polyisocyanurate foam obtainable by the process according to the invention.
摘要:
The present invention relates to polyester polyols obtainable or obtained by esterification of 10 to 70 mol % of at least one compound from the group consisting of terephthalic acid (TPA), dimethyl terephthalate (DMT), polyethylene terephthalate (PET), phthalic anhydride (PA), phthalic acid and isophthalic acid, 0.1 to 30 mol % of one or more fatty acids and/or fatty acid derivatives, 10 to 70 mol % of one or more aliphatic or cycloaliphatic diols having 2 to 18 carbon atoms or alkoxylates thereof, 5 to 70 mol % of a polyether polyol prepared by alkoxylating an aromatic starter molecule having a functionality of not less than 2, and of 0 to 70 mol % of a tri- or polyol other than the polyether polyol, all based on the total amount of the components used, wherein the amounts used of the components add up to 100 mol %. The present invention further relates to a process for producing rigid polyurethane or polyisocyanurate foams which comprises reacting an isocyanate component with a polyol component (PK) comprising a polyester polyol of the present invention and further components, to the polyol component as such and also to the rigid polyurethane or polyisocyanurate foams obtainable or obtained by a process of the present invention. The present invention also relates to the method of using a polyester polyol (P1) of the present invention in the manufacture of rigid polyurethane foams or rigid polyisocyanurate foams.