Floor coating compositions
The invention relates to the use of Real Michael Addition (RMA) crosslinkable composition for the preparation of a floor coating, to special RMA crosslinkable compositions with long working time and very short service time and low VOC and to specific floor compositions, in particular for use in high build floor coating applications.
1. A process for the application of a floor coating comprising mixing a floor coating composition with a base catalyst C and applying the obtained ready to use floor coating composition to a surface of a floor,
wherein the floor coating composition is a Real Michael Addition (RMA) crosslinkable composition comprising at least one crosslinkable component comprising reactive components A and B each comprising at least 2 reactive groups wherein the at least 2 reactive groups of reactive component A are acidic protons (C—H) in activated methylene or methine groups, and the at least 2 reactive groups of reactive component B are activated unsaturated groups (C═C) which reactive groups react to achieve crosslinking by RMA reaction between said at least one crosslinkable components in the presence of the base catalyst (C),
wherein the crosslinkable component comprising reactive component A is a polymer that is modified with fatty acids and is modified with reactive components A in the main chain, pendant, terminal or combinations thereof,
wherein the viscosity of the crosslinkable polymer comprising reactive component A as measured at 23° C. according to DIN EN ISO 3219/A.3, is from 15,000 to 200 mPa·s and
wherein the crosslinkable component comprising reactive component A has a weight average molecular weight Mw between 500 and 10000 g/mol.
2. The process according to claim 1 wherein applying the floor coating composition to a surface of a floor comprises direct coating the composition on a concrete floor without an underlying sealing layer.
3. The process according to claim 1 wherein applying the floor coating composition to a surface of a floor comprises coating the composition on a floor surface in an out-door application when temperatures are lower than 15° C. or the relative humidity higher than 85% RV or when the floor surface is moist.
4. The process according to claim 1 wherein the RMA crosslinkable composition comprises an amount of volatile solvent is between 0 and 20 wt. % relative to the total of the crosslinkable components A and B.
5. The process of claim 4 wherein the RMA crosslinkable composition comprises one or more reactive solvents selected from the group of monomeric or dimeric components A having only 1 reactive acidic protons (C—H) in activated methylene or methine groups.
6. The process of claim 4 wherein the RMA crosslinkable composition comprises a total amount of volatile organic solvent plus reactive solvents between 0 and 30 wt % and the volatile organic solvent is less than 5 wt % to the total weight of the RMA crosslinkable composition.
7. The process of claim 1 wherein RMA crosslinkable composition comprises one or more crosslinkable components chosen from the group of polyesters, alkyds, polyurethanes, polyacrylates, epoxy resins, polyamides and polyvinyl resins which contains component A in the main chain, pendant, terminal or combinations thereof.
8. The process of claim 1 wherein the reactive component A is malonate or acetoacetate and reactive component B is acryloyl.
9. The process of claim 1 wherein more than 50, % of the C—H reactive groups in crosslinkable component comprising reactive component A are from malonate or acetoacetate.
10. The process of claim 1 wherein the RMA crosslinkable composition further comprises floor coating additives.
11. The process of claim 1 wherein catalyst C is a quaternary alkyl ammonium bi- or alkylcarbonate for use in coating layers with a thickness up to 500, 400, 300, 200 or 150 micrometer.
12. The process of claim 1 wherein the RMA crosslinkable composition further comprises a reactivity moderator D comprising an X—H group that is also a Michael addition donor reactable with component B under the action of catalyst C, wherein X is C, N, P, O or S, wherein the X—H group in component D has a pKa (defined in aqueous environment) of at least one unit less than that of the C—H groups in the reactive component A.
13. The process of claim 1 including the step of application of a top-coating over a conventional sealer layer which is based on one or more resins including epoxy, phenolic, silane, acrylics, polyurethane, polyurea, polyaspartic resins and their hybrids.
14. The process according to claim 1 wherein applying the floor coating composition to a surface of a floor comprises coating the composition on a wood floor, vinyl floor, terrazo floor, cork floor, phenolic floor or metal floor.
15. The process of claim 1 wherein the crosslinkable composition comprises one or more reactive solvents selected from the group of monomeric or dimeric components B, having only 1 reactive unsaturated group (C═C).
16. The process of claim 1 wherein RMA crosslinkable composition comprises one or more crosslinkable components chosen from the group of alkyds with a weight average molecular weight Mw between 500 and 10000 g/mol.
17. The process of claim 1 wherein more than 50% of the C—H reactive groups in crosslinkable component comprising reactive component A are from malonate and the remainder of the C—H reactive groups in crosslinkable component A comprising reactive component A are from acetoacetate or acetylacetone.
18. The process of claim 12 wherein the X—H group in component D is an N—H group containing component.
19. The process of claim 1 wherein the floor coating composition comprising the RMA crosslinkable composition is applied to the floor surface via spray, roller, squeegee, trowel, draw down bar, wire rod or by casting.
20. The process according to claim 1 including the step of coating surfaces in out-door applications when temperatures are lower than 15° C. or the relative humidity higher than 85% RV.