IES84204Y1 - A coating composition - Google Patents
A coating composition Download PDFInfo
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- IES84204Y1 IES84204Y1 IE2005/0698A IE20050698A IES84204Y1 IE S84204 Y1 IES84204 Y1 IE S84204Y1 IE 2005/0698 A IE2005/0698 A IE 2005/0698A IE 20050698 A IE20050698 A IE 20050698A IE S84204 Y1 IES84204 Y1 IE S84204Y1
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- 239000008199 coating composition Substances 0.000 title claims abstract description 27
- 239000011230 binding agent Substances 0.000 claims abstract description 32
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 32
- 229960003563 Calcium Carbonate Drugs 0.000 claims abstract description 16
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 16
- 239000002562 thickening agent Substances 0.000 claims abstract description 16
- 239000011248 coating agent Substances 0.000 claims abstract description 15
- 238000000576 coating method Methods 0.000 claims abstract description 15
- 239000006254 rheological additive Substances 0.000 claims abstract description 13
- XTXRWKRVRITETP-UHFFFAOYSA-N vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229940117958 vinyl acetate Drugs 0.000 claims abstract description 11
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000011065 in-situ storage Methods 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims description 58
- 229940094522 laponite Drugs 0.000 claims description 11
- 229920002678 cellulose Polymers 0.000 claims description 7
- 239000001913 cellulose Substances 0.000 claims description 7
- 239000004927 clay Substances 0.000 claims description 4
- 229910052570 clay Inorganic materials 0.000 claims description 4
- BPQQTUXANYXVAA-UHFFFAOYSA-N silicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 3
- -1 laponite Chemical compound 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 3
- 239000003973 paint Substances 0.000 abstract description 3
- 238000009472 formulation Methods 0.000 description 21
- XLOMVQKBTHCTTD-UHFFFAOYSA-N zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 14
- 239000000839 emulsion Substances 0.000 description 12
- DAFHKNAQFPVRKR-UHFFFAOYSA-N (3-hydroxy-2,2,4-trimethylpentyl) 2-methylpropanoate Chemical compound CC(C)C(O)C(C)(C)COC(=O)C(C)C DAFHKNAQFPVRKR-UHFFFAOYSA-N 0.000 description 9
- 239000011505 plaster Substances 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000001993 wax Substances 0.000 description 7
- 239000011787 zinc oxide Substances 0.000 description 7
- 239000000049 pigment Substances 0.000 description 6
- 229920001296 polysiloxane Polymers 0.000 description 6
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 description 4
- 230000003115 biocidal Effects 0.000 description 4
- 239000003139 biocide Substances 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000000945 filler Substances 0.000 description 4
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- 229920001577 copolymer Polymers 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 239000004615 ingredient Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 230000002087 whitening Effects 0.000 description 3
- TZCXTZWJZNENPQ-UHFFFAOYSA-L Barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 239000005977 Ethylene Substances 0.000 description 2
- 240000002989 Euphorbia neriifolia Species 0.000 description 2
- 239000004606 Fillers/Extenders Substances 0.000 description 2
- 210000001503 Joints Anatomy 0.000 description 2
- 229920004482 WACKER® Polymers 0.000 description 2
- 230000003466 anti-cipated Effects 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- KAKZBPTYRLMSJV-UHFFFAOYSA-N butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 2
- GLVVKKSPKXTQRB-UHFFFAOYSA-N ethenyl dodecanoate Chemical compound CCCCCCCCCCCC(=O)OC=C GLVVKKSPKXTQRB-UHFFFAOYSA-N 0.000 description 2
- 230000002538 fungal Effects 0.000 description 2
- 230000000855 fungicidal Effects 0.000 description 2
- 239000000417 fungicide Substances 0.000 description 2
- 231100000053 low toxicity Toxicity 0.000 description 2
- 230000002906 microbiologic Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000003014 reinforcing Effects 0.000 description 2
- 229920001909 styrene-acrylic polymer Polymers 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- 239000012463 white pigment Substances 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- WSLDOOZREJYCGB-UHFFFAOYSA-N 1,2-dichloroethane Chemical compound ClCCCl WSLDOOZREJYCGB-UHFFFAOYSA-N 0.000 description 1
- OVSKIKFHRZPJSS-UHFFFAOYSA-N 2,4-Dichlorophenoxyacetic acid Chemical compound OC(=O)COC1=CC=C(Cl)C=C1Cl OVSKIKFHRZPJSS-UHFFFAOYSA-N 0.000 description 1
- VVQNEPGJFQJSBK-UHFFFAOYSA-N 2-methyl-2-propenoic acid methyl ester Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- WAYFJTUZNWOHQH-UHFFFAOYSA-M 2-propylideneoctanoate Chemical compound CCCCCCC(C([O-])=O)=CCC WAYFJTUZNWOHQH-UHFFFAOYSA-M 0.000 description 1
- CWSZBVAUYPTXTG-UHFFFAOYSA-N 5-[6-[[3,4-dihydroxy-6-(hydroxymethyl)-5-methoxyoxan-2-yl]oxymethyl]-3,4-dihydroxy-5-[4-hydroxy-3-(2-hydroxyethoxy)-6-(hydroxymethyl)-5-methoxyoxan-2-yl]oxyoxan-2-yl]oxy-6-(hydroxymethyl)-2-methyloxane-3,4-diol Chemical compound O1C(CO)C(OC)C(O)C(O)C1OCC1C(OC2C(C(O)C(OC)C(CO)O2)OCCO)C(O)C(O)C(OC2C(OC(C)C(O)C2O)CO)O1 CWSZBVAUYPTXTG-UHFFFAOYSA-N 0.000 description 1
- FEIQOMCWGDNMHM-UHFFFAOYSA-M 5-phenylpenta-2,4-dienoate Chemical compound [O-]C(=O)C=CC=CC1=CC=CC=C1 FEIQOMCWGDNMHM-UHFFFAOYSA-M 0.000 description 1
- 239000005995 Aluminium silicate Substances 0.000 description 1
- PZZYQPZGQPZBDN-UHFFFAOYSA-N Aluminium silicate Chemical compound O=[Al]O[Si](=O)O[Al]=O PZZYQPZGQPZBDN-UHFFFAOYSA-N 0.000 description 1
- 229920003043 Cellulose fiber Polymers 0.000 description 1
- 241000233866 Fungi Species 0.000 description 1
- 241000871495 Heeria argentea Species 0.000 description 1
- 239000004354 Hydroxyethyl cellulose Substances 0.000 description 1
- 210000003491 Skin Anatomy 0.000 description 1
- FKHIFSZMMVMEQY-UHFFFAOYSA-N Talc Chemical compound [Mg+2].[O-][Si]([O-])=O FKHIFSZMMVMEQY-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 125000005396 acrylic acid ester group Chemical group 0.000 description 1
- 229920005822 acrylic binder Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- WPKYZIPODULRBM-UHFFFAOYSA-N azane;prop-2-enoic acid Chemical compound N.OC(=O)C=C WPKYZIPODULRBM-UHFFFAOYSA-N 0.000 description 1
- 230000001580 bacterial Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- HHSPVTKDOHQBKF-UHFFFAOYSA-J calcium;magnesium;dicarbonate Chemical compound [Mg+2].[Ca+2].[O-]C([O-])=O.[O-]C([O-])=O HHSPVTKDOHQBKF-UHFFFAOYSA-J 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 239000000789 fastener Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 125000003827 glycol group Chemical group 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 230000005661 hydrophobic surface Effects 0.000 description 1
- 239000000391 magnesium silicate Substances 0.000 description 1
- 229910052919 magnesium silicate Inorganic materials 0.000 description 1
- 235000019792 magnesium silicate Nutrition 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 229920001897 terpolymer Polymers 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
Abstract
ABSTRACT A coating composition for in-situ coating of a surface comprises calcium carbonate, an acrylic or Vinylacetate—based binder, a thickening agent, and a rheology modifier, the weight ratio of the calcium carbonate to acrylic-based binder being from 5:1 to 15:1. The coating may be applied directly to a plasterboard wall or ceiling using a roller technique and provides a high quality surface finish to which a paint may be applied directly.
Description
“A COATING COMPOSITION”
Introduction
The invention relates to a coating composition for in situ coating a surface, especially
a wall formed by plasterboard wall panels to provide a high quality surface finish.
Plasterboard which is referred to in some countries as wallboard, gypsum wallboard,
or drywall is widely used to provide internal walls and/or ceilings in building
constructions. The plasterboard is cut to a desired size from large panels and the cut
lengths are attached to fixtures such as wall bates. The joints between adjacent boards
are filled and the surface of the wall is skimmed with a plaster compound by manual
towelling. This is extremely time consuming, labour intensive, and requires
Considerable skill. In addition, even with such skilled finishing techniques joints and
fixing points are often clearly visible through the skin. This is a particular problem
when the wall is painted as the painting tends to highlight rather than hide such
imperfections.
There is therefore a need for a coating system for coating a surface, especially an
erected plasterboard wall or ceiling which will eliminate or at least substantially
reduce the problems with known systems.
Statements of Invention
According to the invention there is provided a coating composition for in~situ coating
of a surface comprising calcium carbonate, an acrylic or vinylacetate-based binder, a
thickening agent, and a rheology modifier, the weight ratio of the calcium carbonate to
binder being from 5:1 to 15:]
In one embodiment the weight ratio of calcium carbonate to binder is from 7:1 to 14:1.
The weight ratio of the calcium carbonate to binder may be approximately 10:1.
In one embodiment the calcium carbonate is present in an amount of from 65 to 80%
by weight of the composition. The calcium carbonate may be present in an amount of
approximately 70% by weight of the composition.
In one embodiment the binder is present in an amount of from 5 to 10% by weight of
the composition. The binder may be present in an amount of approximately 6.5% by
weight of the composition.
In one embodiment the binder is a styrene acrylic binder or an acrylic binder.
In one embodiment the thickening agent comprises a cellulose thickener. The
cellulose thickener may be present in any amount of from 0.1% to 0.5% by weight of
the composition. The cellulose thickener may be present in an amount of from 0.2%
to 0.4% by weight of the composition. More particularly, the cellulose thickener may
be present in an amount of from 0.25% to 0.35% by weight of the composition.
In one embodiment of the invention the rheology modifier comprises a synthetic clay.
The rheology modifier may comprise a synthetic silicate. More particularly the
rheology modifier is laponite.
In one embodiment the rheology modifier is present in an amount of from 0.05 to
0.2% by weight of the composition. The rheology modifier may be present in an
amount of from 0.1% to 0.15% by weight of the composition. The rheology modifier
may be present in an amount of approximately 0.12% by weight of composition.
In one embodiment the composition comprises a high boiling point solvent. The
solvent may be present in an amount of from 10% to 20% based on the binder resin
weight.
The coating composition may comprise a biocide. The coating composition may
comprise a fungicide. The coating composition may comprise a pigment dispersing
agent.
In one embodiment the coating composition comprises a whitening agent. The
whitening agent may comprise zinc oxide. The zinc oxide may be present in an
amount of from 0.5% to 5.0% on total formulation weight. The zinc oxide may be
present in an amount of from about 2.0% on total formulation weight.
In one embodiment the coating composition comprises a wax emulsion. The wax
emulsion may be present in an amount of from 0.25% to 1.5% on total formulation
weight. The wax formulation may be present in an amount of about 0.625% on total
formulation weight.
In another embodiment the coating composition comprises an hydraulic binder. The
binder may be present in an amount of from 1.0% to 5.0% on total formulation weight.
The binder may be present in an amount of about 2.0% on total formulation weight.
In one embodiment the composition comprises a silicone emulsion. The silicone
emulsion may be present in an amount of from 1.0% to 10.0% on total formulation
weight. The silicone emulsion may be present in an amount of about 5% on total
formulation weight.
The coating composition may comprise a de-foaming agent.
In one embodiment the coating composition comprises a fibre reinforcing media. The
fibres may be present in an amount of from 0.25% to 5.0% on total formulation
weight. The fibres may be present in an amount of about 0.5% on total formulation
weight.
The invention also provides a method of coating a surface comprising applying a
coating composition of the invention. In one embodiment the coating composition is
applied by a roller technique.
Detailed Description
The invention will be more clearly understood from the following description thereof
given by way of example only.
Example 1
A rollable coating composition for in situ coating a wall is prepared from the
following ingredients:
Component — - i
Water 21.65
1. Laponite B 0.12
2. Cellosize H 15,000 ypz 0.32
3. Nipacide CFB 0.22
4. Nipacide DFF 0.08
. Pigment Disperser A 0.87
6. Revacryl 248 6.5
7. Omycarb 5ML 69.29
8. Tioxide TR92 0.87
9. Rhodoline DF668I 0.08
]. This is a synthetic layered silicate. It imparts shear and sensitive rheology and
improves stability and syneresis control — from Rockwood Additives Limited.
2. This is a medium weight cellulosic polymer thickening agent — from Dow
Chemical Company.
. This is a low toxicity biocide for microbiological protection against bacterial
and fungal spoilage in the wet state. It is a water based liquid ~ from Clairant
UK Limited.
. This is a low toxicity biocide for microbiological protection against algal and
fungal spoilage in the dry state. It is a glycol based solution — from Clairant
UK Limited.
. This is a solution of ammonium polyacrylate available from BASF.
6. This is a surfactant stabilised styrene acrylic ester copolymer dispersion.
7. This is calcium carbonate from OMYA of New Zealand with a particle size
range of less than 25 microns.
. This is a multipurpose rutile pigment/whitening agent from Huntsman Tioxide.
9. This is a high performance deafoamer from Rhodia.
To prepare the coating composition, water is first added to a mixing vessel followed
by the thickening agents. The mixture is agitated for about 5 minutes after which the
biocide is added to the mixture, followed by the fungicide. The mixture is again
agitated for about 2 minutes. The pigment dispenser is then added and the vessel
contents are agitated for a further minute. The polymeric binder is added and the
mixture is agitated for about a further 5 minutes. The calcium carbonate and whitener
pigment are then added and the vessel contents are mixed until there is a substantially
uniform dispersion. Finally the defoaming agent is added and the vessel contents are
mixed for a further two minutes.
The mixture thus formed is filled into containers ofa suitable size such as 5, 10 or 20
litres and sealed with an airtight lid.
In use, the coating composition can be applied directly using a roller. The coating is
applied by a roller to a thickness of about l to 2 mm without sagging.
The liquid may be applied directly to a wall. The liquid coating composition thus
formed may then be applied to a plasterboard wall using a conventional roller. The
surface is coated with an even and consistent film which on drying, provides a “white-
out” surface.
It has been found that the coating achieves a very high quality surface finish to which
gloss or matt paint may be applied directly without joint photographing or show-
through of fasteners.
Example 2
Another rollable coating composition for in—situ coating a wall is prepared from the
following ingredients:
Component fégm
Water 21.17
1 Laponite B 0.10
2 Natrosol 250HBR 0.36
3 Acticide MBO 0.22
4 Acticide OTW8 0.08
DispexA40/Decal 204] 0.87
6 Revaeryl 248 6.50
7 Omyacarb 5ML 69.72
8 Tiona TC90 0.46
9 Dispelair CF525 0.30
Texanol 0.42
The composition is prepared as outlined in Example 1 above.
Natrosol 250HBR is a water soluble hydroxyethycellulose (from Hercules) and
functionally equivalent to the Cellosize of Example 1. Acticide MBO (from Thor) is
equivalent to Nipacide CFB. Acticide OTW8 (from Thor) is functionally equivalent
to Nipacide DEF. DispexA40 (from Ciba) and Decal 2041 (from Devine Chemicals)
are equivalent to Pigment Dispenser A. Tiona TC9O (from Millenium Chemicals) is
equivalent to Tioxide TR 92. Dispelair CF525 (from Blackburn Chemicals) is
equivalent to Rhodoline DF66812.
Texanol is a high boiling point solvent from Eastman. Its function is as a coalescent to
prevent cracking. The amount of Texanol may be increased in the above formulation
such that the Texanol is added in an amount of about 16% on resin weight. The
Texanol may be present in an amount of 1 .O3kg in a 100kg batch.
White spirit may be used in combination with Texanol as a coalescing agent. The
white spirit may be present in an amount of about 25% on resin weight. White spirit
can be used as a replacement for Texanol where faster film formation with lower
residual odour is required. Texanol and white spirit can be used together for film
development properties.
Example 3
A coating composition for in-situ coating using a trowel is prepared from the
following ingredients:
Component %w/w
Water 21 .1 l
Laponite B 0.10
Natrosol 250HBR 0.74
Acticide MBO 0.22
Acticide OTW8 0.08
DispexA40/Decal 204] 0.87
Revacryl 248 6.44
Omyacarb SML 69.39
Tiona TC90 0.47
Dispelair CF525 0.08
Texanol 0.50
The difference between the roller applied product and trowel applied product is
viscosity. The trowel formulation contains 105.6% more hydroxyethylcellulose which
makes the fonnulation thicker (assists in reducing sag in thick films and gives better
film build) and gives better controlled drying in thick films (due to good water
retention).
Laponite RD may be used as an alternative to Laponite B in an exact weight for
weight switch in the above formulations. Laponite RD may be preferred in view of
superior anti-sedimentation properties.
The composition of the invention comprises a rheology modifier, especially a
synthetic clay such as laponite and a thickener, especially a cellulose based thickener.
We have found that this combination is important in achieving desired rheological
properties. The combination of an acrylic-based binder and the calcium carbonate
filler is also important in achieving the rollable composition of the invention. The
thickener and rheology modifier combined with the selection of the filler provides the
rheological properties of the roller and trowel applied products of the invention. The
combination of hyroxyethylcellulose and Laponite gives excellent filler suspension
and syneresis control. The gradual film build imported by the Laponite gives
excellent flow and leveling. The selection of Omyacarb 5 as the filler with a fine
particle size and low oil absorption gives a system with good flow and ease of
application which is especially desirable for a DIY (do-it-yourself) product.
It will be appreciated that it may be possible to use a range of acrylic and/or
vinylacetate binders in the composition of the invention. The binder is preferably an
acrylic-based binder, especially a copolymer of styrene / butyl acrylate. It may also be
acrylic comprising the comonomers of ethylhexylacrylate and/or methylmethacrylate
and/or butylacrylate. lt may also be possible to use a vinylacetate binder such as
polyvinylacetate, vinylaeetate/ethylene, vinylacetate/ethylene/acrylic acid ester,
vinylacetate/ethylene/vinylchloride.
Zinc oxide may be utilised as a white pigment component in an amount of from 0.5%
to 5%, preferably about 2.0% on total formulation weight. In addition to acting as a
white pigment the zinc oxide would also impart a degree of mildew and fungi
protection on the dry plaster film. The zinc oxide will also increase the opacity of the
plaster film. Such zinc oxide may be AZO-ZZZ-l l l-American Zinc Sales Company
or EP-AAA—427W—Eagle Pitcher lndustries Inc XXNew Jersey Zinc Company.
The formulation. may also comprise an hydraulic binder to improve the abrasion
resistance of the dry plaster film. It is anticipated that such an hydraulic binder would
improve flexural strength and adhesion. The hydraulic binder can be either a
copolymer of vinyl acetate and ethylene or preferably a terpolymer of vinyl
acetate/vinyl versatate/vinyl laurate. The hydraulic binder may be present in an
amount of from 1.0% to 5.0%, preferably about 2.0% on total formulation weight.
Such a binder may be Vinnapas RE 545Z vinyl acetate/ethylene redispersible powder
from Wacker Chemie, Germany or (preferred) Vinnapas RI 538Z a vinyl acetate/vinyl
versatate/vinyl laurate redispersible powder also from Wacker Chemie, Germany.
The formulation may comprise a wax emulsion to increase the water repellant
properties of the plaster in the initial stages of drying. It is anticipated that such a wax
emulsion will assist in preventing shrinkage cracks after the plaster has dried through.
One such wax emulsion is Basophob WDS, an aqueous paraffin wax dispersion as
manufactured by BASF, Germany. The wax emulsion may be present in an amount of
from 0.25% to 1.5%, preferably about 0.625% on total formulation weight.
The formulation may also comprise a silicone emulsion as a co-binder resin for use
with the acrylic-based binder (in the examples above Revacryl 248) to provide a very
hydrophobic surface after the plaster has dried through. Such a co—binder may be
especially useful in situations where the plaster will not be over-coated with paint or
wallpaper. One such silicone emulsion is Tegophobe 1000, a polymethyl phenyl
silicone resin as manufactured by Tego Chemie Service GmbH. The silicone
emulsion may be present in an amount of from 1.0% to 10.0%, preferably about 5.0%
on total formulation weight.
Fibre reinforcing media may be used to improve the flexural strength of the
fonnulation to assist in crack resistance and flexibility. The fibre may, for example be
one of more of cellulose fibres available from Excel Industries Limited or polyester
fibres Type PE1 (lmm) available from F.H. Wrigley Ltd. UK or Dralon fibres
(3.33mm) available from Schwarzwaelder Textile Works GmbH. The fibres may be
typically from 0.5mm to 5.0mm, preferably about 1mm to 3.5mm. They may be
present in an amount of from 0.25% to 5.0%, preferably about 0.5% on total
formulation weight.
It may be possible to substitute fillers / extenders for some of the calcium carbonate.
Such fillers/extenders include barium sulphate, china clay (aluminium silicate),
dolomite (calcium magnesium carbonate), talc (magnesium silicate) or blends thereof.
It will be appreciated that while the invention has been described as a coating for
application to plasterboard panels the coating composition may be applied to other
surfaces for example as a primer for a wallpaper, or tiling.
-1]-
The invention is not limited to the embodiments hereinbefore described which may be
varied in detail.
Claims (1)
- CLAIMS A coating composition for in—situ coating of a surface comprising calcium carbonate, an acrylic or vinylacetate-based binder, a thickening agent. and a rheology modifier, the weight ratio of the calcium carbonate to binder being from 5:1 to l5:l A coating composition as claimed in claim 1 wherein the weight ratio of calcium carbonate to binder is from 7:1 to 14:1, preferably approximately l0:l, and wherein the calcium carbonate is present in an amount of from 65 to 80% by weight of the composition, preferably approximately 70% by weight of the composition, and wherein the binder is present in an amount of from 5 to 10% by weight of the composition, preferably approximately 6.5% by weight of the composition. A coating composition as claimed in claim 1 or 2 wherein the thickening agent comprises a cellulose thickener and wherein the cellulose thickener is present in any amount of from 0.1% to 0.5% by weight of the composition, preferably in an amount of from 0.2% to 0.4% by weight of the composition, preferably in an amount of from 0.25% to 0.35% by weight ofthe composition. A coating composition as claimed in any of claims 1 to 3 wherein the rheology modifier comprises a synthetic clay, preferably a synthetic silicate such as laponite, preferably the rheology modifier is present in an amount of from 0.05 to 0.2% by weight of the composition, preferably from 0.1% to 0.15% by weight of the composition, preferably approximately 0.12% by weight of composition. A method of coating a surface comprising applying a coating composition as claimed in any of claims 1 to 4.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IEIRELAND18/10/20042004/0699 |
Publications (2)
Publication Number | Publication Date |
---|---|
IE20050698U1 IE20050698U1 (en) | 2006-05-03 |
IES84204Y1 true IES84204Y1 (en) | 2006-05-03 |
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