Two-component polyurethane compositions, in particular suitable for use as tough structural adhesives or as potting compounds

Patent metadata

Field	Value
Publication number	US-9587152-B2
Application number	US-201314428548-A
Country	US
Kind code	B2
Filing date	Sep 5, 2013
Priority date	Sep 14, 2012
Publication date	Mar 7, 2017
Grant date	Mar 7, 2017

Abstract

The invention concerns two-component polyurethane compositions of a polyol component and a polyisocyanate component, the polyol component including at least one reaction product of castor oil and ketone resins with an OH number of 110 to 200 mg KOH/g, and at least one aliphatic triol, and the polyisocyanate component including at least one aromatic polyisocyanate, the ratio in weight percent of being between 4 and 50 and the ratio of all NCO groups of the aromatic polyisocyanates to all the OH groups totaling (A1+A2)=1.15:1-85:1, the aliphatic triol being-1,2,3-propane triol and/or-1,1,1-trimethylol propane and/or polyether polyols based on 1,1,1-trimethylol propane with a molecular weight of 170-500 g/mol and an OH-number of 400-1100 mg KOH/g, and the total of all the OH groups of (A1+A2) being ≧90% of the total of all the OH groups of the two-component polyurethane composition.

First claim

The invention claimed is:

1. A two-component polyurethane composition consisting of a polyol component K1, a polyisocyanate component K2, and one or more member selected from the group consisting of fillers and drying agents; wherein
the polyol component K1 is
at least one reaction product of ricinus oil with ketone resins with an OH number of 110 to 200 mg KOH/g A1, and
at least one aliphatic triol A2;

the polyisocyanate component K2 is at least one aromatic polyisocyanate B1;
the weight percent ratio (A1/A2) is 20-50;
the ratio of all the NCO groups of the aromatic polyisocyanates B1 to all the OH groups in the sum of (A1+A2) =1.15:1-0.85:1;
the aliphatic triol A2 is
1,2,3-propanetriol and/or
1,1,1-trimethylolpropane and/or
polyether polyols based on 1,1,1-trimethylolpropane with a molecular weight of 170-500 g/mol and an OH number of 400-1100 mg KOH/g; and

the total of all the OH groups of (A1+A2) is ≧99.5% of the total of all the OH groups of the two-component polyurethane composition.

2. Two-component polyurethane composition according to claim 1 , wherein the aliphatic triol A2 is 1,2,3-propanetriol.

3. Two-component polyurethane composition according to claim 1 , wherein the aliphatic triol A2 is 1,1,1-trimethylolpropane.

4. Two-component polyurethane composition according to claim 1 , wherein the aliphatic triol A2 consists of polyether polyols based on 1,1,1-trimethylolpropane with a molecular weight of 170-500 g/mol and an OH number of 400-1100 mg KOH/g.

5. Two-component polyurethane composition according to claim 1 , wherein the weight percent ratio (A1/A2) is 35-50.

6. Two-component polyurethane composition according to claim 1 , wherein the aromatic polyisocyanate B1 consists of
MDI, comprising ≧40% by weight of monomeric MDI; and/or
TDI, comprising ≧40% by weight of monomeric TDI,
relative to the total weight of the MDI and/or TDI.

7. Two-component polyurethane composition according to claim 1 , wherein in the two-component polyurethane composition, the total of the OH groups that do not originate from (A1+A2) is ≦5%, relative to the total of all the OH groups of the two-component polyurethane composition.

8. Two-component polyurethane composition according to claim 1 , wherein in the two-component polyurethane composition, the total of the NCO groups that do not originate from B1 is ≦5%, relative to the total of all the NCO groups of the two-component polyurethane composition.

9. Two-component polyurethane composition according to claim 1 , wherein the proportion of the total of A1 and A2 is ≧90% by weight, relative to the total weight of the polyol component K1.

10. Two-component polyurethane composition according to claim 1 , wherein the proportion of the aromatic polyisocyanate B1 is ≧90% by weight, relative to the total weight of the polyisocyanate component K2.

11. Method for bonding, comprising the steps of
mixing the polyol component (K1and the polyisocyanate component (K2) of a two-component polyurethane composition according to claim 1 ,
applying the mixed polyurethane composition to at least one of the substrate surfaces to be bonded together,
joining within the open time,
curing the polyurethane composition.

12. Method for a non-positive filling in of joints and fissures in a substrate, comprising the steps of:
a) mixing the polyol component (K1) and the polyisocyanate component (K2) of a two-component polyurethane composition according to claim 1 ,
b) applying the mixed polyurethane composition in the joint to be bridged between two substrates or in the fissure to be filled in on the surface of a substrate,
c) curing the polyurethane composition in the joint or in the fissure.

13. A bonded article comprising two substrates bonded together, wherein the bonded article is made by the method according to claim 11 .

14. A composition-filled article, the composition-filled article comprising either
two substrates that are bridged by a joint, or
a substrate having a surface, the surface having a fissure that has been filled; wherein composition-filled article is made by the method according to claim 12 .

15. Two-component polyurethane composition according to claim 1 , wherein the polyether polyols based on 1,1,1-trimethylolpropane are selected from the group consisting of alkoxylated 1,1,1-trimethylolpropane, ethoxylated 1,1,1-trimethylolpropane, and propoxylated 1,1,1-trimethylolpropane.

16. Two-component polyurethane composition according to claim 1 , wherein the polyether polyols based on 1,1,1-trimethylolpropane are selected from the group consisting of ethoxylated 1,1,1-trimethylolpropane and propoxylated 1,1,1-trimethylolpropane.

17. Two-component polyurethane composition according to claim 1 , wherein the polyether polyols based on 1,1,1-trimethylolpropane comprise propoxylated 1,1,1-trimethylolpropane.

18. A two-component polyurethane composition consisting of a polyol component K1, a polyisocyanate component K2, and one or more member selected from the group consisting of fillers and drying agents; wherein
the polyol component K1 is
at least one reaction product of ricinus oil with ketone resins
with an OH number of 110 to 200 mg KOH/g A1, and
at least one aliphatic triol A2, the aliphatic triol A2 being a polyether polyol based on 1,1,1-trimethylolpropane with a molecular weight of 170-500 g/mol and an OH number of 400-1100 mg KOH/g;

the polyisocyanate component K2 is at least one aromatic polyisocyanate B1;
the weight percent ratio (A1/A2) is 10-50;
the ratio of all the NCO groups of the aromatic polyisocyanates B1 to all the OH groups in the sum of (A1+A2) =1.15:1-0.85:1; and
the total of all the OH groups of (A1+A2) is ≧90% of the total of all the OH groups of the two-component polyurethane composition.

Assignees

• Sika Tech Ag

Inventors

• Kelch Steffen
• DÜRNAY Wolfgang

Classifications

• C08G18/6644 Primary

  having at least three hydroxy groups · CPC title

• B32B37/12

  characterised by using adhesives · CPC title

• C09J175/06 Primary

  from polyesters · CPC title

• C08G18/686

  containing cycloaliphatic groups · CPC title

• C08G18/36

  Hydroxylated esters of higher fatty acids · CPC title