ALKYD RESIN COMPOSITION COMPRISING SILICA

Abstract

Disclosed is an oxidatively drying alkyd resin composition and a method for preparing said composition. Said composition is obtained by admixing an aqueous silica sol into a substantially 100% alkyd resin being in a liquid state either at ambient temperature or at an elevated temperature. Said silica sol is added in an amount of 0.1-10% by weight calculated as 100% silica on 100% alkyd resin. The use of a said composition is in a further aspect disclosed.

Claims

1-11. (canceled)

12. A method of obtaining a composition comprising at least one oxidatively drying alkyd resin and at least one colloidal silica, wherein said method comprises addition under vigorous stirring and in an amount of 0.1-10% by weight calculated as 100% silica on 100% alkyd resin, of a colloidal silica to a 100% alkyd resin being in a liquid state at ambient or elevated temperature.

13. The method according to claim 12, wherein said alkyd resin is in a liquid state at a temperature of 30-140° C.

14. The method according to claim 12, wherein said silica is a sterically or electrostatically stabilized silica.

15. The method according to claim 12, wherein said silica is salt free and/or free of counter ions.

16. The method according to claim 12, wherein said silica is a silica sol.

17. The method according to claim 12, wherein said silica is a siloxane, silazane or silan modified or treated silica.

18. The composition according to claim 12, wherein said silica is present as silica nanoparticles.

19. The method according to claim 12, wherein said method further and after said silica addition comprises an evaporation.

20. The method according to claim 19, wherein said evaporation is performed under vacuum or reduced pressure

21. The method according to claim 19, wherein said evaporation is performed at a temperature of 40-120° C.

22. The method according to 12, wherein said method further comprises a neutralization of said alkyd resin before or after said silica addition.

23. The method according to claim 22, wherein said alkyd resin is at least partially neutralized.

24. The method according to claim 22, wherein said neutralization is performed using an inorganic base, ammonia and/or an amine.

25. The method according to claim 22, wherein said method further comprises addition of at least one surfactant or emulsifier.

26. The method according to claim 12, wherein said method further comprises (a) neutralization with at least one inorganic base, at least one amine or ammonia, (b) addition of at least one surfactant or emulsifier and (c) addition of water.

27. The method according to claim 26, wherein said method further comprises a phase inversion or homogenization yielding an alkyd emulsion.

28. The method according to claim 27, wherein said method further comprises addition of at least one pigment, filler, levelling additive, flow additive and/or antifoaming.

29. The method according to claim 28, wherein said method yields a decorative and/or protective coating.

30. The method according to claim 12, wherein said method further comprises dilution with at least one organic solvent.

31. The method according to claim 30, wherein said organic solvent is propanol, butanol, pentanol, hexanol and/or octanol.

32. The method according to claim 31, wherein said method further comprises addition of at least one pigment, filler, levelling additive, flow additive and/or antifoaming.

33. The method according to claim 32, wherein said method yields a decorative and/or protective coating.

Description

EXAMPLE 1

[0030] In the following Examples 1-14, two (2) different oxidatively drying alkyd resins were used and alkyd emulsions were, using conventional methods as previously disclosed, prepared by emulsifying 40 parts by weight of a composition yielded in Example 2-14, with an addition of 2% by weight of an anionic surfactant and 8% by weight of a non-ionic surfactant (said percentages being weight percentages calculated on 100% alkyd), in 60 parts by weight of water. All yielded emulsions were clear and stable.

[0031] Used alkyd resins exhibited following properties:

TABLE-US-00001 Alkyd Resin 1 Alkyd Resin 2 Oil length, % 72 65 Acid value, mg KOH/g 9 8 Hydroxyl value, mg KOH/g 50 43 Molecular weight, Mw, g/mol 55 000 85 000

EXAMPLE 2

[0032] 100 parts by weight of alkyd resin 1 was heated to 80° C. and 2.29 parts by weight of a 25% solution of NaOH were under stirring (210 rpm) added. The mixture was subsequently for 1 hour vigorously stirred (ca. 260 rpm). 6.67 parts by weight of an aqueous silica sol (Bindzil® PC300, Eka Nobel, Sweden) was now added and the resulting mixture was for 1 hour vigorously stirred (ca. 260 rpm) at 80° C. Yielded composition was finally submitted to vacuum at 80° C. during 2 hours to remove water and/or residual azeotropic solvent. Drying properties, at 40% non-volatile content, was recorded on a Beck-Koller Drying Recorder at a wet filmthickness of 75±5 μm. The result is given in Table 1.

EXAMPLE 3

[0033] 100 parts by weight of alkyd resin 1 was heated to 80° C. 6.67 parts by weight of an aqueous silica sol (Bindzil® PC300, Eka Nobel, Sweden) and 2 parts of butanol were added under vigorous stirring (ca. 260 rpm). Yielded composition was for 1 hour vigorously stirred (ca. 260 rpm) at 80° C. and yielded composition was finally submitted to vacuum at 80° C. during 2 hours to remove water. Drying properties, at 40% non-volatile content, was recorded on a Beck-Koller Drying Recorder at a wet filmthickness of 75±5 m. The result is given in Table 1.

EXAMPLE 4

[0034] 100 parts by weight of alkyd resin 1 heated to 80° C. and 2.29 parts by weight of a 25% solution of NaOH were under stirring (210 rpm) added. The mixture was subsequently vigorously stirred (ca. 260 rpm) for 1 hour. 6.67 parts by weight of a silica sol (Ludox® SM-30, Grace Davidson, USA) was then added and resulting mixture was for 1 hour vigorously (ca. 260 rpm) stirred at 80° C. Yielded composition was finally submitted to vacuum at 80° C. during 2 hours to remove water. Drying properties, at 40% non-volatile content, was recorded on a Beck-Koller Drying Recorder at a wet filmthickness of 75±5 μm. The result is given in Table 1.

EXAMPLE 5

[0035] 100 parts by weight of alkyd resin 1 was heated to 80° C. and 2.29 parts by weight of a 25% solution of NaOH were under stirring added. The mixture was subsequently for 1 hour vigorously stirred (ca. 260 rpm). 6.67 parts by weight of a silica sol (Bindzil® PC300, Eka Nobel, Sweden) was now added and the mixture was for a further hour vigorously stirred (ca. 260 rpm) followed by addition of 0.167 parts by weight of a solution of cobalt/zirconium drier (6% Co and 9% Zr) and the resulting mixture was for yet 1 hour vigorously stirred (ca. 260 rpm). Yielded composition was finally submitted to vacuum at 80° C. during 2 hours to remove water. Drying properties, at 40% non-volatile content, was recorded on a Beck-Koller Drying Recorder at a wet filmthickness of 75±5 μm. The result is given in Table 1.

EXAMPLE 6

[0036] 100 parts by weight of alkyd resin 2 was heated to 80° C. and 2.29 parts by weight of a 25% solution of NaOH were under stirring added. The mixture was subsequently for 1 hour vigorously stirred (ca. 260 rpm). 6.67 parts by weight of a silica sol (Bindzil® PC300, Eka Nobel, Sweden) was now added and the mixture was for a further hour vigorously stirred (ca. 260 rpm) followed by addition of 0.167 parts by weight of a solution of cobalt/zirconium drier (6% Co and 9% Zr) and the resulting mixture was for yet 1 hour vigorously stirred (ca. 260 rpm). Yielded composition was finally submitted to vacuum at 80° C. during 2 hours to remove water. Drying properties, at 40% non-volatile content, was recorded on a Beck-Koller Drying Recorder at a wet filmthickness of 75±5 μm. The result is given in Table 1.

EXAMPLE 7

[0037] 100 parts by weight of alkyd resin 1 was heated to 80° C. and 2.29 parts by weight of a 25% solution of NaOH were under stirring added. The mixture was subsequently for 1 hour vigorously stirred (ca. 260 rpm). 3.34 parts by weight of a silica sol (Bindzil® PC300, Eka Nobel, Sweden) was now added and the mixture was for a further hour vigorously stirred (ca. 260 rpm) followed by addition of 0.167 parts by weight of a solution of cobalt/zirconium drier (6% Co and 9% Zr) and the resulting mixture was for yet 1 hour vigorously stirred (ca. 260 rpm). Yielded composition was finally submitted to vacuum at 80° C. during 2 hours to remove water. Drying properties, at 40% non-volatile content, was recorded on a Beck-Koller Drying Recorder at a wet filmthickness of 75±5 μm. The result is given in Table 1.

EXAMPLE 8

[0038] 100 parts by weight of alkyd resin 1 was heated to 80° C. and 2.29 parts by weight of a 25% solution of NaOH were under stirring added. The mixture was subsequently for 1 hour vigorously stirred (ca. 260 rpm). 13.36 parts by weight of a silica sol (Bindzil® PC300, Eka Nobel, Sweden) was now added and the mixture was for a further hour vigorously stirred (ca. 260 rpm) followed by addition of 0.167 parts by weight of a solution of cobalt/zirconium drier (6% Co and 9% Zr) and the resulting mixture was for yet 1 hour vigorously stirred (ca. 260 rpm). Yielded composition was finally submitted to vacuum at 80° C. during 2 hours to remove water. Drying properties, at 40% non-volatile content, was recorded on a Beck-Koller Drying Recorder at a wet filmthickness of 75±5 μm. The result is given in Table 1.

EXAMPLE 9

[0039] 100 parts by weight of alkyd resin 1 heated to 80° C. and 2.29 parts by weight of a 25% solution of NaOH were under stirring (210 rpm) added. The mixture was subsequently vigorously stirred (ca. 260 rpm) for 1 hour. 5.38 parts by weight of a silica sol (Ludox® TMA, Grace Davidson, USA) was then added and resulting mixture was for 1 hour vigorously (ca. 260 rpm) stirred at 80° C. Yielded composition was finally submitted to vacuum at 80° C. during 2 hours to remove water. Drying properties, at 40% non-volatile content, was recorded on a Beck-Koller Drying Recorder at a wet filmthickness of 75±5 μm. The result is given in Table 1.

EXAMPLE 10

[0040] 100 parts by weight of alkyd resin 1 was heated to 80° C. and 2.29 parts by weight of a 25% solution of NaOH were under stirring (210 rpm) added. The mixture was for 1 hour vigorously stirred (ca. 260 rpm). 6.67 parts by weight of a silica sol (Bindzil® PC300, Eka Nobel, Sweden) and 2 parts of butanol were subsequently added under vigorous stirring. The mixture was yet 1 hour vigorously stirred (ca. 260 rpm). Yielded composition was finally submitted to vacuum at 80° C. during 2 hours to remove water. Drying properties, at 40% non-volatile content, was recorded on a Beck-Koller Drying Recorder at a wet filmthickness of 75±5 μm. The result is given in Table 1.

EXAMPLE 11

[0041] 100 parts by weight of alkyd resin 1 was heated to 80° C. and 2.29 parts by weight of a 25% solution of NaOH were under stirring (210 rpm) added. The mixture was for 1 hour vigorously stirred (ca. 260 rpm). 6.67 parts by weight of a silica sol (Bindzil® PC300, Eka Nobel, Sweden) and 2 parts of hexanol were subsequently added under vigorous stirring. The mixture was yet 1 hour vigorously stirred (ca. 260 rpm). Yielded composition was finally submitted to vacuum at 80° C. during 2 hours to remove water. Drying properties, at 40% non-volatile content, was recorded on a Beck-Koller Drying Recorder at a wet filmthickness of 75±5 μm. The result is given in Table 1.

EXAMPLE 12

[0042] 100 parts by weight of alkyd resin 1 was heated to 80° C. and 2.29 parts by weight of a 25% solution of NaOH were under stirring (210 rpm) added. The mixture was for 1 hour vigorously stirred (ca. 260 rpm). 6.67 parts by weight of a silica sol (Bindzil® PC300, Eka Nobel, Sweden) and 2 parts of pentanol were subsequently added under vigorous stirring. The mixture was yet 1 hour vigorously stirred (ca. 260 rpm). Yielded composition was finally submitted to vacuum at 80° C. during 2 hours to remove water. Drying properties, at 40% non-volatile content, was recorded on a Beck-Koller Drying Recorder at a wet filmthickness of 75±5 μm. The result is given in Table 1.

EXAMPLE 13 (COMPARATIVE)

[0043] 100 parts by weight of alkyd resin 1 was heated to 80° C. and 2.29 parts by weight of a 25% NaOH solution was under stirring (210 rpm) added. This mixture was for 1 hour vigorously stirred (ca. 260 rpm) at 80° C. Yielded composition was finally submitted to vacuum during 2 hours to remove water. Drying properties, at 40% non-volatile content, was recorded on a Beck-Koller Drying Recorder at a wet filmthickness of 75±5 μm. The result is given in Table 1.

EXAMPLE 14 (COMPARATIVE)

[0044] 100 parts by weight of alkyd resin 1 was heated to 80° C. and 2.29 parts by weight of a 25%/solution of NaOH were under stirring (210 rpm) added. The mixture was for 1 hour vigorously stirred (ca. 260 rpm) and 1 part by weight of a solution of cobalt/zirconium drier (6% Co and 9% Zr) was subsequently added. Resulting mixture was for yet 1 hour vigorously stirred (ca. 260 rpm) at 80° C. Yielded composition was finally submitted to vacuum at 80° C. during 2 hours to remove water. Drying properties, at 40% non-volatile content, was recorded on a Beck-Koller Drying Recorder at a wet filmthickness of 75±5 μm. The result is given in Table 1.

TABLE-US-00002 TABLE 1 Dust Free Tack Free Through Dry Hard hrs. hrs. hrs. hrs. Example 2 2 14 32 41 Example 3 8 27 48 48 Example 4 1 2.5 32.5 40 Example 5 0.5 1.5 2.5 4 Example 6 2 3 6 11 Example 7 0.5 1.5 2.5 4.5 Example 8 0.5 1 3 5.5 Example 9 8.5 13.5 28.5 42 Example 10 1 5 28 41 Example 11 5.5 11.5 18 40.5 Example 12 1.5 13 22.5 41 Example 13 (comparative) 10 19 45 47.5 Example 14 (comparative) 0.5 1 2.5 6.5