Cold flexible polyurethane formulation

Patent metadata

Field	Value
Publication number	US-11091652-B2
Application number	US-201816480373-A
Country	US
Kind code	B2
Filing date	Jan 22, 2018
Priority date	Jan 25, 2017
Publication date	Aug 17, 2021
Grant date	Aug 17, 2021

Abstract

Described herein are processes for producing cold-flexible polyurethane insulation, in which (a) polyisocyanates are mixed with (b) compounds having groups which are reactive to isocyanates, (c) blowing agents, (d) catalysts, (e) plasticizers and optionally (f) further additives to give a reaction mixture and the mixture is applied to a surface and cured to form insulation. Also described herein is a polyurethane insulation obtainable by a process described herein.

First claim

The invention claimed is:

1. A process for producing cold-flexible polyurethane insulation, in which
a) polyisocyanates are mixed with
b) compounds having groups which are reactive toward isocyanates,
c) blowing agents,
d) catalysts,
e) plasticizers and optionally
f) further additives
to give a reaction mixture and the mixture is applied to a surface and cured to form insulation, wherein
polyisocyanates (a), compounds (b) having groups which are reactive toward isocyanates, blowing agents (c), catalysts (d), plasticizers (e) and optionally further additives (f) are reacted in such amounts that the isocyanate index is in a range from 100-200,
the compounds (b) having groups which are reactive toward isocyanates comprise at least one polyetherol (b1) having a nominal functionality of 4 or more, alkylene oxide having a proportion of propylene oxide, based on the total weight of alkylene oxide present in the at least one polyetherol (b1), of more than 60% by weight and an OH number of at least 300 mg KOH/g, at least one polyetherol (b2) having a nominal functionality of 3.5 or less, OH groups having a proportion of primary OH groups, based on the total number of OH groups present in the at least one polyetherol (b2), of more than 50% and an OH number of less than 300 mg KOH/g, at least one polyesterol (b3) and chain extenders and/or crosslinkers (b4),
the polyetherol (b2) comprises at least one polyetherol (b2a) having a nominal functionality of 3.5 or less, alkylene oxide having a proportion of ethylene oxide, based on the total weight of alkylene oxide present in the at least one polyetherol (b2a) of at least 80% by weight, OH groups having a proportion of primary OH groups, based on the total number of OH groups present in the at least one polyetherol (b2a), of more than 80% and an OH number of from more than 100 mg KOH/g to less than 300 mg KOH/g and at least one polyetherol (b2b) having a nominal functionality of 3.5 or less, OH groups having a proportion of primary OH groups, based on the total number of OH groups present in the at least one polyetherol (b2b), of more than 60% and an OH number of from more than 20 mg KOH/g to less than 80 mg KOH/g,
and wherein a water content in the reaction mixture, based on a total weight of the components (b) to (e), is less than 0.5% by weight.

2. The process according to claim 1 , wherein ethylenediamine is used as a starter molecule in a preparation of the polyetherol (b1).

3. The process according to claim 1 , wherein the at least one polyesterol (b3) has a nominal functionality of from 2 to 2.5 and a hydroxyl number of from 100 to 400 mg KOH/g.

4. The process according to claim 1 , wherein the at least one polyesterol (b3) is obtained by condensation of a diacid component with a diol component, wherein the diacid component comprises an aromatic diacid and the diol component comprises diethylene glycol.

5. The process according to claim 1 , wherein at least one compound of the chain extenders and/or crosslinkers (b4) has amine end groups.

6. The process according to claim 1 , wherein the proportion of (b1) is from 15 to 35% by weight, that of (b2) is from 15 to 35% by weight, that of (b3) is from 20 to 35% by weight and that of (b4) is from 10 to 35% by weight, in each case based on a total weight of the compounds (b).

7. The process according to claim 1 , wherein the compounds b comprise less than 20% by weight of further compounds having groups which are reactive toward isocyanates in addition to (b1) to (b4).

8. The process according to claim 1 , wherein mixtures of monomeric diphenylmethane diisocyanate (MMDI) and multiring condensation products of diphenylmethane diisocyanate are used as polyisocyanates (a).

9. The process according to claim 1 , wherein the further additives comprise from 5 to 25% by weight of flame retardants.

10. The process according to claim 9 , wherein the flame retardants comprise triethyl phosphate.

11. The process according to claim 1 , wherein the reaction mixture is applied to the surface by spraying.

12. The process according to claim 1 , wherein a density of the polyurethane insulation is from 30 to 80 g/l and physical blowing agents are used as blowing agents.

13. A polyurethane insulation obtainable by a process according to claim 1 .

14. A polyurethane insulation according to claim 13 , wherein a CTSR (cryogenic thermal stress resistance) factor is greater than 1.5.

15. A method for insulating a liquefied natural gas tank on board a ship, the method comprising insulating the liquefied natural gas tank using the polyurethane insulation according to claim 13 .

Assignees

• Basf Se

Inventors

• Mohmeyer Nils
• Graalmann Onno
• Grieser-Schmitz Christof
• Eisenhardt Andrea
• Eslava Josep-Daniel

Classifications

• C08G18/4833

  Polyethers containing oxyethylene units · CPC title

• C08G18/24

  of tin · CPC title

• C08J2375/04

  Polyurethanes · CPC title

• C08G18/6685

  with compounds of group C08G18/3225 or polyamines of C08G18/38 · CPC title

• C08G18/5021

  having nitrogen · CPC title