Solvent-containing emulsified alkyd resin coating compound for stain and varnish coatings

Abstract

A solvent-containing coating compound for stains and varnish coatings, in particular for house varnishes or components thereof, containing or consisting of at least one oxidatively drying organic binder, selected from the group consisting of at least one oxidatively drying middle oil and/or long oil alkyd resin, in particular an oxidatively drying long oil alkyd resin, at least one primary drier based on iron, in particular comprising or consisting of at least one organic salt of iron and/or a coordination complex of iron, in particular a complex salt of iron, at least one first secondary drier, in particular comprising or consisting of at least one organic and/or inorganic salt or a compound of zirconium, magnesium, calcium, strontium, barium, zinc, lithium or aluminium, solvent, water, at least one emulsifying agent, optionally, at least one conventional additive.

Claims

1. A solvent-containing coating compound for varnish coatings and stains for house varnishes or components thereof, containing or consisting of at least one oxidatively drying organic binder, selected from the group consisting of at least one oxidatively drying middle oil and/or a long oil alkyd resin; at least one primary drier based on iron, comprising or consisting of at least one organic salt of iron and/or a coordination complex of iron; at least one first secondary drier comprising or consisting of at least one organic and/or inorganic salt or a compound of zirconium, magnesium, calcium, strontium, barium, zinc, lithium or aluminium, solvent, water; and at least one emulsifying agent based on a film-forming polysaccharide resin in a quantity for use of 0.1-10% by weight.

2. A solvent-containing coating compound for varnish coatings and stains for house varnishes or components thereof, containing or consisting of at least one oxidatively drying organic binder, selected from the group consisting of at least one oxidatively drying middle oil and/or a long oil alkyd resin; at least one primary drier based on iron, comprising or consisting of at least one organic salt of iron and/or a coordination complex of iron; at least one first secondary drier comprising or consisting of at least one organic and/or inorganic salt or a compound of zirconium, magnesium, calcium, strontium, barium, zinc, lithium or aluminium, solvent, water; and at least one emulsifying agent, wherein the coating compound has a water content of 2-40% by weight.

3. The coating compound as claimed in claim 2, wherein the coating compound is substantially free from siccatives based on cobalt and manganese.

4. The coating compound as claimed in claim 2, wherein the oxidatively drying organic binder further comprises at least one oxidatively drying modified middle oil and/or a long oil alkyd resin selected from the group consisting of siliconized alkyd resins, acrylated alkyd resins, isocyanate-modified alkyd resins and any mixtures thereof.

5. The coating compound as claimed in claim 2, wherein the solvent comprises or consists of aromatics-free aliphatic hydrocarbons selected from the group consisting of dearomatized white spirit, n-paraffins, isoparaffins, cycloparaffins and any mixtures thereof, and contains methoxypropoxypropanol as a co-solvent.

6. The coating compound as claimed in claim 2, further comprising: an additive selected from the group consisting of defoaming agents, light stabilizers, radical scavengers, wetting agents, dispersing agents, silicone surface additives comprising polyether-modified polymethylalkylsiloxane and/or silicone polyether copolymers and/or surface active polyacrylates, waxes, and any mixtures of these compounds.

7. The coating compound as claimed in claim 2, characterized in that the coating compound is substantially free from amorphous silicon dioxide and SiO2 based compounds.

8. The coating compound as claimed in claim 2, wherein the fraction of the primary drier based on iron, with respect to its metallic fraction, is in the range of 0.0001 to 0.3 percent by weight with respect to the total weight of the coating compound, the fraction of the at least one first secondary drier comprising or consisting of at least one organic salt of zirconium, strontium, calcium, magnesium, barium, zinc, lithium and/or aluminium, with respect to its metallic fraction, is in the range of 0.005 to 1.5 percent by weight with respect to the total weight of oxidatively drying organic binder, and/or in that the fraction of the at least one second secondary drier comprising or consisting of at least one organic salt of calcium, lithium, zirconium and any mixture, with respect to its metallic fraction, is herein in the range of 0.005 to with respect to the total weight of oxidatively drying organic binders, and/or in that the fraction of solvent is in the range of 0.1 to 40 percent by weight with respect to the total weight of the coating compound.

9. The coating compound as claimed in claim 2, further comprising: at least one colorant, wherein the coating compound has with a pigment-volume concentration (PVC) according to EN ISO 4618-1 of 0 to 50%.

10. The coating compound as claimed in claim 2, wherein the at least one oxidatively drying organic binder comprises the long oil alkyd resin, and the long oil alkyd resin is an oxidatively drying long oil alkyd resin, and wherein the coordination complex of iron—is a complex salt of iron.

11. The coating compound as claimed in claim 2, further comprising: at least one conventional additive.

12. The coating compound as claimed in claim 2, further comprising at least one second secondary drier comprising or consisting of at least one organic salt of calcium, zirconium and any mixture thereof, wherein the first and the second secondary drier are different.

13. The coating compound as claimed in claim 12, wherein the organic salt of the first and/or second secondary driers comprises neodecanoates, oleates, stearates, palmitates, octoates and/or zirconium neodeconoate and/or strontium neodecanoate.

14. The coating compound as claimed in claim 2 wherein the long oil fraction of the oxidatively drying long oil alkyd resins is based on linoleic acid, linolenic acid, oleic acid and palmitic acid, and/or in that the middle oil fraction of the oxidatively drying middle oil alkyd resins is based on linoleic acid, linolenic acid and/or oleic acid.

15. The coating compound as claimed in claim 14 wherein the middle oil fraction of the oxidatively drying middle oil alkyd resins is further based on the addition of linoleic acid, linolenic acid, oleic acid and palmitic acid.

16. A coating on a substrate having a cover coating, primer, primer-/topcoat-1-pot coating or transparent or semi-transparent final coating, obtained or obtainable by application of, and physical or chemical drying of, the coating compound in accordance with claim 2.

17. The coating as claimed in claim 16, wherein the coating has an average, dry layer thickness determined in accordance with DIN EN ISO 2808-2 (May 2017), which is not over 100 μm.

Description

EXEMPLARY EMBODIMENT 1

(1) White Varnish, Satin Finish: In Accordance with the Invention

(2) TABLE-US-00001 Alkyd resin 20% by weight Thixotropic alkyd resin 2% by weight Water 8% by weight Emulsifying agent 1% by weight Fillers 16% by weight Pigments/colorants 32% by weight Additives: wetting agents/dispersing 4.8% by weight agents, deaerators, defoaming agents, slip additives/free flow additives, anti-skinning agents, light stabilizers, radical scavengers, etc. Matting agent (PE-wax) 3.0% by weight Solvent 12.8% by weight Iron primary drier 0.0003% by weight (with respect to the metallic fraction) Zirconium siccative (auxiliary drier) 0.2% by weight Calcium siccative (through drier) 0.2% by weight

(3) White Varnish, Satin Finish: Reference Example 1

(4) TABLE-US-00002 Alkyd resin 24% by weight Thixotropic alkyd resin 2% by weight Fillers 16% by weight Pigments/colorants 32% by weight Additives: wetting agents/dispersing agents, 4.8% by weight deaerators, defoaming agents, slip additives/free flow additives, anti-skinning agents, light stabilizers, radical scavengers, etc. Matting agent (amorphous silica) 3.0% by weight Solvent 17.8% by weight Iron primary drier 0.0003% by weight (with respect to the metallic fraction) Zirconium siccative (auxiliary drier) 0.2% by weight Calcium siccative (through drier) 0.2% by weight

(5) Reference Example 1 contained no water and therefore also contained no emulsifier. The matting agent polyethylene wax was exchanged for amorphous silica.

(6) In Reference Example 2, in the formulation in accordance with the invention for the satin finish white varnish, the polyethylene wax matting agent was exchanged for amorphous silica; in addition, instead of the iron primary drier, a conventional cobalt primary drier was employed in the usual quantity.

(7) The coating compounds (in accordance with the invention, Reference Example 1 and Reference Example 2) were applied with a 75 μm doctor blade and tested with a Drying Recorder.

(8) The coating composition in accordance with the invention was sufficiently dry after approximately 3.5 hours; that of Reference Example 2 after approximately 8 hours. In contrast, Reference Example 1 was still not dry after 24 hours, and so the test was stopped.

Exemplary Embodiment 2

(9) White Surface Varnish: In Accordance with the Invention

(10) TABLE-US-00003 Alkyd resin 28% by weight Thixotropic alkyd resin 12% by weight Water 14% by weight Emulsifying agent 2% by weight Pigments/colorants 8% by weight Additives: wetting/dispersing 3.6% by weight agents, deaerators, defoaming agents, slip additives/free flow additives, anti-skinning agents, light stabilizers, radical scavengers, etc. Matting agent 2.0% by weight Solvent 30% by weight Iron primary drier 0.0004% by weight (with respect to the metallic fraction) Zirconium siccative (auxiliary drier) 0.25% by weight Calcium siccative (through drier) 0.15% by weight

(11) The coatings obtained from the coating compounds in accordance with the invention did not display any tendencies to discolouration. It is also of practical relevance to obtain film hardnesses with the coating compounds in accordance with the invention, as usually obtained when employing conventional cobalt-based primary driers.

(12) A further advantage of the coating compounds in accordance with the invention is the reduction in the VOC content. Less solvent has to be used, because a portion thereof is substituted with water. As a matter of fact, for example, with the coating compounds in accordance with the invention for decorative applications, VOC values of less than 300 g/L were obtained. In order to determine the volatile organic compounds content (VOC content), DIN EN ISO standard 11890-1 (September 2007) may be employed.