Polyurea-based fabric glue
The present invention relates to a polyurea system, the use of such a polyurea system for sealing, linking, gluing, or covering of cellular tissue, and a dosing system having two chambers for a polyurea system such as this. The polyurea system comprises as components: A) an isocyanate-functioning prepolymer, which can be derived by reacting aliphatic isocyanates with polyoles, and B) an amino-functioning ester of aspartic acid. According to the invention, water and/or tertiary amine is added to the system, in order to increase the reacting speed of the prepolymer with the amino-functioning ester of aspartic acid while decreasing the setting time at the same time.
1. A polyurea system comprising
A) isocyanate-functional prepolymers obtained by reacting
aliphatic isocyanates A1) with
polyols A2) which have a number-average molecular weight of ≧400 g/mol and an average OH functionality of 2 to 6,
B) amino-functional aspartic esters of formula (I)
wherein
X is an organic radical containing no Zerewitinoff-active hydrogen,
R 1 and R 2
are identical or different organic radicals containing no Zerewitinoff-active hydrogen, and
n is an integer of at least 2,
and/or
optionally C) organic fillers and
optionally D) reaction products of the isocyanate-functional prepolymers of A) with aspartic esters B) and/or organic fillers C),
wherein said system comprises water and tertiary amine as E), wherein the tertiary amine is selected from the group consisting of N,N-dimethyl-2-(4-methylpiperazin-1-yl)ethanamine, 2-[{2-(dimethylamino)ethyl](methyl)amino}ethanol, and 3,3′,3″-(1,3,5-triazinane-1,3,5-triyl)tris(N,N-dimethylpropan-1-amine).
2. The polyurea system of claim 1 , wherein said polyurea system contains 0.2% to 2.0% by weight of water and/or 0.1% to 1.0% by weight of tertiary amine.
3. The polyurea system of claim 1 , wherein X is an optionally branched or linear organic radical having 1 to 20 carbon atoms which optionally contains heteroatoms.
4. The polyurea system of claim 1 , wherein the polyols A2) comprise polyester polyols and/or polyester-polyether polyols and/or polyether polyols.
5. The polyurea system of claim 4 , wherein the polyols used for preparing component A) have a number-average molecular weight of 4000 to 8500 g/mol.
6. The polyurea system of claim 1 , wherein the organic fillers of component C) are hydroxyl-functional compounds.
7. The polyurea system of claim 6 , wherein the fillers of component C) have an average OH functionality of 1.5 to 3.
8. The polyurea system of claim 6 , wherein the fillers of component C) have repeating ethylene oxide units.
9. The polyurea system of claim 1 for sealing, connecting, bonding or covering cellular tissue, more particularly for staunching the egress of blood or tissue fluids or for sealing leaks in cellular tissue.
10. The polyurea system of claim 9 for use for sealing, connecting, bonding or covering human or animal cellular tissue.
11. A composition for sealing, connecting, bonding, or covering cellular tissue comprising the polyurea system of claim 1 .
12. The composition of claim 11 , wherein said composition is used for sealing, connecting, bonding or covering human or animal cellular tissue.
13. A metering system having two chambers for a polyurea system as claimed in claim 1 , wherein one chamber contains component A) and the other chamber contains components B) and E) or B), D)+E), and, optionally, components C) and D) of the polyurea system.