WO2024038383A1 - A water based paint stripper composition, and method of manufacturing the composition - Google Patents
A water based paint stripper composition, and method of manufacturing the composition Download PDFInfo
- Publication number
- WO2024038383A1 WO2024038383A1 PCT/IB2023/058210 IB2023058210W WO2024038383A1 WO 2024038383 A1 WO2024038383 A1 WO 2024038383A1 IB 2023058210 W IB2023058210 W IB 2023058210W WO 2024038383 A1 WO2024038383 A1 WO 2024038383A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- composition
- mixture
- water
- sodium carbonate
- calcium hydroxide
- Prior art date
Links
- 239000000203 mixture Substances 0.000 title claims abstract description 171
- 239000003973 paint Substances 0.000 title claims abstract description 52
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 229910001868 water Inorganic materials 0.000 title claims abstract description 42
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 89
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 62
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 34
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 34
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 34
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 30
- 229920002472 Starch Polymers 0.000 claims abstract description 22
- 235000019698 starch Nutrition 0.000 claims abstract description 22
- 239000008107 starch Substances 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 21
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 54
- 238000000576 coating method Methods 0.000 claims description 26
- 238000002156 mixing Methods 0.000 claims description 21
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 claims description 13
- 229910000165 zinc phosphate Inorganic materials 0.000 claims description 13
- 229920002261 Corn starch Polymers 0.000 claims description 12
- 239000008120 corn starch Substances 0.000 claims description 12
- 229920001684 low density polyethylene Polymers 0.000 claims description 6
- 239000004702 low-density polyethylene Substances 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 5
- 238000007790 scraping Methods 0.000 claims description 4
- JYYOBHFYCIDXHH-UHFFFAOYSA-N carbonic acid;hydrate Chemical compound O.OC(O)=O JYYOBHFYCIDXHH-UHFFFAOYSA-N 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000003599 detergent Substances 0.000 claims description 3
- 235000011116 calcium hydroxide Nutrition 0.000 description 24
- 235000011121 sodium hydroxide Nutrition 0.000 description 22
- 235000017550 sodium carbonate Nutrition 0.000 description 20
- 229910052751 metal Inorganic materials 0.000 description 13
- 239000002184 metal Substances 0.000 description 13
- 239000011248 coating agent Substances 0.000 description 4
- 239000011449 brick Substances 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 239000005997 Calcium carbide Substances 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 description 2
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 241000940835 Pales Species 0.000 description 1
- 206010033546 Pallor Diseases 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 244000007853 Sarothamnus scoparius Species 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- -1 chalk Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- DIOQZVSQGTUSAI-UHFFFAOYSA-N decane Chemical compound CCCCCCCCCC DIOQZVSQGTUSAI-UHFFFAOYSA-N 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
- 239000000052 vinegar Substances 0.000 description 1
- 235000021419 vinegar Nutrition 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D9/00—Chemical paint or ink removers
Definitions
- This invention relates to a water-based paint stripper.
- the invention relates to a water-based roof paint stripper (WBRPS) composition, a method of applying the composition to a metal roof; method of manufacturing the composition, and kit thereof.
- WBRPS water-based roof paint stripper
- this patent relates to a composition for removing paint coatings.
- the composition includes sodium hydroxide, quicklime, chalk, water, soda ash and polyethylene oxide.
- US1 ,589,219 relates to a paint and varnish removing compound consisting of a non-inflammable paste containing lye, sal soda, hydrated magnesium sulphate, corn starch, and calcium carbide. Calcium carbide is added to the solution just prior to application thereby liberating acetylene gas and producing hydrated lime.
- compositions are not available for removing paint from a metal roof.
- an aqueous composition for stripping paint from a surface wherein the composition includes:
- composition has a viscosity of about 30 000 to 40 000 centipoise (cPs).
- the starch is corn starch.
- the composition may comprise: about 3% w/w sodium carbonate; about 7% w/w calcium hydroxide; about 2% w/w starch; and about 12% w/w sodium hydroxide, about 76% w/w water; wherein the composition has a viscosity of about 33 000 to 36 000 cPs.
- the composition comprises about 6 kg sodium carbonate; about 14 kg calcium hydroxide; about 5 kg starch; about 25 kg sodium hydroxide; and about 160 I of water, wherein the composition has a viscosity of about 33 000 to 36 000 cPs.
- the composition may include a retardant, preferably the retardant is raw glycerol.
- the composition may comprise: about 3% w/w sodium carbonate; about 7% w/w calcium hydroxide; about 2% w/w starch; about 12% w/w sodium hydroxide; about 1% w/w raw glycerol; and about 75% w/w water; wherein the composition has a viscosity of about 34 600 cPs.
- the composition comprises: about 6 kg sodium carbonate; about 14 kg calcium hydroxide; about 5 kg starch; about 25 kg sodium hydroxide; about 2.5 kg raw glycerol; and about 160 I water; wherein the composition has a viscosity of about 34 600 cPs.
- the composition may include zinc phosphate.
- the composition may comprise: about 3% w/w sodium carbonate; about 7% w/w calcium hydroxide; about 2% w/w starch; about 12% w/w sodium hydroxide; about 1% w/w raw glycerol; about 1% w/w zinc phosphate about 74% w/w water; wherein the composition has a viscosity of about 34 600 cPs.
- the composition comprises: about 6 kg sodium carbonate; about 14 kg calcium hydroxide; about 5 kg starch; about 25 kg sodium hydroxide; about 2.5 kg raw glycerol; about 1 .8 kg w/w zinc phosphate; about 160 I water; wherein the composition has a viscosity of about 34 600 cPs.
- step (b) blending the mixture of step (a) to produce a blended mixture
- step (c) adding calcium hydroxide to the blended mixture of step (b), and blending the mixture to produce a blended mixture of water, sodium carbonate and calcium hydroxide;
- step (d) optionally adding a retardant and/or zinc phosphate to the blended mixture of step (c), and blending the mixture further;
- step (e) adding starch to the blended mixture of step (c) or (d), and blending the mixture even further;
- step (f) leaving the blended mixture of step (e) open to allow the mixture to settle;
- step (g) breaking the mixture of step (f), and re-blending the mixture to produce a smooth, consistent composition.
- steps (b) to (d) further include blending the mixtures using an electric mixer at a speed of about 700 revolutions per minute (rpm) for about to 5 minutes.
- step (e) further includes blending the mixture using an electric mixer at a speed of about 700 rpm for about 10 minutes.
- the blended mixture of step (f) is left open for about 48 to 72 hours depending on ambient temperature to allow the mixture to settle.
- a kit including:
- the cover is a low density polyethylene sheet.
- step (b) applying the composition of step (a) to the surface;
- step (e) repeating step (d) until the entire covered surface is uncovered, and paint coatings are scraped off from the whole surface;
- step (f) washing the paint coatings of step (d) or (e) with water and/or with a cleaning apparatus and detergent.
- the composition is applied in 1 ,5-meter strips at a time and covered at once.
- the surface is a metal roof.
- Figure 1 shows a method of covering a surface containing a paint stripper composition in accordance with the invention
- Figure 2 shows a method of removing the cover and scraping the surface of Figure 1 in accordance with another embodiment of the invention
- Figure 3 shows a method of washing the scraped surface of Figure 2 in accordance with another embodiment of the invention.
- FIG 4 shows personal protective equipment (PPE) required when applying the methods of Figure 1 to 3.
- PPE personal protective equipment
- This invention relates to a composition for stripping or removing paint/paint coatings from a surface.
- the composition includes:
- composition may include about 0% to 2% w/w retardant, preferably about 1 % retardant.
- the retardant is raw glycerol.
- the composition may comprise: about 3% w/w sodium carbonate; about 7% w/w calcium hydroxide; about 2% w/w starch; about 12% w/w sodium hydroxide; and about 76% w/w water; wherein the composition has a viscosity of about 33 000 to 36 000 cPs.
- the composition comprises: about 6 kg sodium carbonate; about 14 kg calcium hydroxide; about 5 kg starch; about 25 kg sodium hydroxide; and about 160 I of water, wherein the composition has a viscosity of about 33 000 to 36 000 cPs.
- the composition may comprise: about 3% w/w sodium carbonate; about 7% w/w calcium hydroxide; about 2% w/w starch; about 12% w/w sodium hydroxide; about 1% w/w raw glycerol; and about 75% w/w water; wherein the composition has a viscosity of about 34 600 cPs.
- the composition comprises: about 6 kg sodium carbonate; about 14 kg calcium hydroxide; about 5 kg starch; about 25 kg sodium hydroxide; about 2.5 kg raw glycerol; and about 160 I water; wherein the composition has a viscosity of about 34 600 cPs.
- the composition may include about 0% to 1% w/w zinc phosphate.
- the composition may comprise: about 3% w/w sodium carbonate; about 7% w/w calcium hydroxide; about 2% w/w starch; about 12% w/w sodium hydroxide; about 1% w/w raw glycerol; about 1% w/w zinc phosphate about 74% w/w water; and wherein the composition has a viscosity of about 34 600 cPs.
- the composition comprises about 6 kg sodium carbonate; about 14 kg calcium hydroxide; about 5 kg starch; about 25 kg sodium hydroxide; about 2.5 kg raw glycerol; about 1 .8 kg w/w zinc phosphate; about 160 I water; and wherein the composition has a viscosity of about 34 600 cPs.
- a retardant such as raw glycerol during the manufacturing of the composition reduces the time it takes the composition to dry once it is applied to a surface.
- the surface can be any surface for which paint/paint coating has previously been applied, including a metal, wood, concrete, and asbestos.
- the surface is a metal roof.
- the calcium hydroxide used is preferably brown/white hydrated lime.
- the starch is preferably, corn starch (food grade), and sodium hydroxide is caustic soda (NaOH 99%).
- composition for stripping paint from a surface is manufactured using the following steps:
- step (b) blending the mixture of step (a) to produce a blended mixture
- step (c) adding calcium hydroxide to the blended mixture of step (b), and blending the mixture to produce a blended mixture of water, sodium carbonate and calcium hydroxide;
- step (d) optionally adding a retardant and/or zinc phosphate to the blended mixture of step (c), and blending the mixture further;
- step (e) adding starch to the blended mixture of step (c) or (d), and blending the mixture even further;
- step (f) leaving the blended mixture of step (e) open to allow the mixture to settle;
- step (g) breaking the mixture of step (f), and re-blending the mixture to produce a smooth, consistent composition.
- Steps (b) to (d) further include blending the mixtures using an electric mixer at a speed of about 700 rpm for about 5 minutes.
- step (e) the mixture is blended using an electric mixer at a speed of about 700 rpm for about 10 minutes.
- the blended mixture of step (f) is left open for about 48 to 72 hours depending on ambient temperature to allow the mixture to settle. After 48 or 72 hours depending on ambient temperature, break the settled product and mix the product again using an electric mixer on medium speed to produce a smooth consistent composition.
- composition for stripping paint from a metal roof may also be supplied as a kit, comprising of the said composition, and a cover.
- the cover is a low density polyethylene sheet.
- the low density polyethylene sheet may be washed and re-used.
- the paint stripper composition is applied to a surface using the following steps:
- step (b) applying the composition of step (a) to the surface;
- step (e) repeating step (d) until the entire covered surface is uncovered, and paint coatings are scraped off from the whole surface;
- step (f) washing the paint coatings of step (d) or (e) with water and/or with a cleaning apparatus and detergent (as shown in Figure 3).
- the composition is applied in 1 ,5-meter strips at a time, and covered at once.
- Example 1 Manufacturing method for a paint stripper composition
- Pre-cut cover sheets (LDPE Low density polyethylene 60 microns) to correct size in order to cover the WB Roof Paint Stripper.
- the entire WB Roof Paint Stripper system saves time, labour and is in the long run more cost effective. • For example, a 500m 2 roof will take approximately five (5) days to apply the complete WB Roof Paint Stripper process to get old flacking paint back to bare metal. Where normally it would take 1 .5 to 2 weeks to mechanically sand, grind and scrap any old paint coatings off surfaces. This older method leaves ⁇ 70% of the old coatings stay and the paint coatings that have been left behind has been weakened by friction in this process.
- Anti-corrosive primers have been designed to apply to metal and for corrosion but not designed to apply on old flaking roof coatings.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Paints Or Removers (AREA)
Abstract
This invention relates to an aqueous composition for stripping paint from a surface, method of manufacturing the composition as well as a method of applying the composition to the surface. The composition includes sodium carbonate about 2% to 4% w/w; calcium hydroxide about 5% to 9% w/w; starch about 1% to 3% w/w; sodium hydroxide about 10% to 14% w/w, and the balance is water. The composition has a viscosity of about 30 000 to 40 000 centipoise (cPs).
Description
A WATER BASED PAINT STRIPPER COMPOSITION, AND METHOD OF MANUFACTURING THE COMPOSITION
INTRODUCTION
This invention relates to a water-based paint stripper. In particular, but not exclusively, the invention relates to a water-based roof paint stripper (WBRPS) composition, a method of applying the composition to a metal roof; method of manufacturing the composition, and kit thereof.
BACKGROUND TO THE INVENTION
According to a machine translation of RU2204577C2, this patent relates to a composition for removing paint coatings. The composition
includes sodium hydroxide, quicklime, chalk, water, soda ash and polyethylene oxide.
US1 ,589,219 relates to a paint and varnish removing compound consisting of a non-inflammable paste containing lye, sal soda, hydrated magnesium sulphate, corn starch, and calcium carbide. Calcium carbide is added to the solution just prior to application thereby liberating acetylene gas and producing hydrated lime.
These compositions are not available for removing paint from a metal roof.
It is an object of this invention to provide an improved water-based roof paint stripper composition and method of stripping paint/coatings from a metal roof.
SUMMARY OF THE INVENTION
In accordance with a first aspect of the invention there is provided an aqueous composition for stripping paint from a surface, wherein the composition includes:
Sodium carbonate about 2% to 4% w/w;
Calcium hydroxide about 5% to 9% w/w;
Starch about 1 % to 3% w/w;
Sodium hydroxide about 10% to 14% w/w, and the balance is water; wherein:
the composition has a viscosity of about 30 000 to 40 000 centipoise (cPs).
Preferably, the starch is corn starch.
The composition may comprise: about 3% w/w sodium carbonate; about 7% w/w calcium hydroxide; about 2% w/w starch; and about 12% w/w sodium hydroxide, about 76% w/w water; wherein the composition has a viscosity of about 33 000 to 36 000 cPs.
Typically, the composition comprises about 6 kg sodium carbonate; about 14 kg calcium hydroxide; about 5 kg starch; about 25 kg sodium hydroxide; and about 160 I of water, wherein the composition has a viscosity of about 33 000 to 36 000 cPs.
The composition may include a retardant, preferably the retardant is raw glycerol.
The composition may comprise: about 3% w/w sodium carbonate; about 7% w/w calcium hydroxide; about 2% w/w starch; about 12% w/w sodium hydroxide;
about 1% w/w raw glycerol; and about 75% w/w water; wherein the composition has a viscosity of about 34 600 cPs.
Typically, the composition comprises: about 6 kg sodium carbonate; about 14 kg calcium hydroxide; about 5 kg starch; about 25 kg sodium hydroxide; about 2.5 kg raw glycerol; and about 160 I water; wherein the composition has a viscosity of about 34 600 cPs.
The composition may include zinc phosphate.
The composition may comprise: about 3% w/w sodium carbonate; about 7% w/w calcium hydroxide; about 2% w/w starch; about 12% w/w sodium hydroxide; about 1% w/w raw glycerol; about 1% w/w zinc phosphate about 74% w/w water; wherein the composition has a viscosity of about 34 600 cPs.
Typically, the composition comprises: about 6 kg sodium carbonate; about 14 kg calcium hydroxide;
about 5 kg starch; about 25 kg sodium hydroxide; about 2.5 kg raw glycerol; about 1 .8 kg w/w zinc phosphate; about 160 I water; wherein the composition has a viscosity of about 34 600 cPs.
In accordance with another embodiment of the invention there is provided a method of manufacturing a paint stripper composition including the steps of:
(a) providing a mixture of water and sodium carbonate;
(b) blending the mixture of step (a) to produce a blended mixture;
(c) adding calcium hydroxide to the blended mixture of step (b), and blending the mixture to produce a blended mixture of water, sodium carbonate and calcium hydroxide;
(d) optionally adding a retardant and/or zinc phosphate to the blended mixture of step (c), and blending the mixture further;
(e) adding starch to the blended mixture of step (c) or (d), and blending the mixture even further;
(f) leaving the blended mixture of step (e) open to allow the mixture to settle; and
(g) breaking the mixture of step (f), and re-blending the mixture to produce a smooth, consistent composition.
Preferably, steps (b) to (d) further include blending the mixtures using an electric mixer at a speed of about 700 revolutions per minute (rpm) for about to 5 minutes.
Preferably, step (e) further includes blending the mixture using an electric mixer at a speed of about 700 rpm for about 10 minutes.
Preferably, the blended mixture of step (f) is left open for about 48 to 72 hours depending on ambient temperature to allow the mixture to settle.
In accordance with another embodiment of the invention, there is provided a kit including:
(a) the composition defined above; and
(b) a cover.
Preferably, the cover is a low density polyethylene sheet.
In yet another embodiment of the invention, there is provided a method of applying the composition as defined above to a surface, wherein the method comprises of the steps of:
(a) providing a composition to be applied to a surface;
(b) applying the composition of step (a) to the surface;
(c) immediately covering the surface containing the composition with a cover;
(d) after about 24 hours to 48 hours, partially removing the cover from an area of the covered surface, and scraping the uncovered surface to remove paint/paint coatings from the surface;
(e) repeating step (d) until the entire covered surface is uncovered, and paint coatings are scraped off from the whole surface; and
(f) washing the paint coatings of step (d) or (e) with water and/or with a cleaning apparatus and detergent.
Preferably, the composition is applied in 1 ,5-meter strips at a time and covered at once.
Typically, the surface is a metal roof.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail, by way of examples only, with reference to the accompanying drawings in which:
Figure 1 shows a method of covering a surface containing a paint stripper composition in accordance with the invention;
Figure 2 shows a method of removing the cover and scraping the surface of Figure 1 in accordance with another embodiment of the invention;
Figure 3 shows a method of washing the scraped surface of Figure 2 in accordance with another embodiment of the invention; and
Figure 4 shows personal protective equipment (PPE) required when applying the methods of Figure 1 to 3.
DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS
Before any embodiments of the invention are explained in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the following drawings.
Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
As used herein, throughout this specification, the singular forms “a”, “an” and “the” include the plural form, unless the context clearly indicates otherwise.
The terminology and phraseology used herein is for the purpose of description and should not be regarded as limiting. The use of the terms “comprising”, “containing”, “having”, “including”, and variations thereof used herein, are meant to encompass the items listed thereafter, and equivalents thereof as well as additional items.
In this specification, all amounts are expressed as percentage weight in relation to the total weight (% w/w) of the composition.
This invention relates to a composition for stripping or removing paint/paint coatings from a surface. The composition includes:
Sodium carbonate about 2% to 4% w/w;
Calcium hydroxide about 5% to 9% w/w;
Starch about 1 % to 3% w/w;
Sodium hydroxide about 10% to 14% w/w, and the balance is water, and wherein the composition has a viscosity of about 30 000 to 40 000 cPs.
Optionally, the composition may include about 0% to 2% w/w retardant, preferably about 1 % retardant. The retardant is raw glycerol.
The composition may comprise: about 3% w/w sodium carbonate; about 7% w/w calcium hydroxide; about 2% w/w starch; about 12% w/w sodium hydroxide; and about 76% w/w water; wherein the composition has a viscosity of about 33 000 to 36 000 cPs.
Preferably, the composition comprises: about 6 kg sodium carbonate; about 14 kg calcium hydroxide; about 5 kg starch; about 25 kg sodium hydroxide; and about 160 I of water, wherein the composition has a viscosity of about 33 000 to 36 000 cPs.
The composition may comprise: about 3% w/w sodium carbonate; about 7% w/w calcium hydroxide; about 2% w/w starch; about 12% w/w sodium hydroxide; about 1% w/w raw glycerol; and about 75% w/w water; wherein the composition has a viscosity of about 34 600 cPs.
Preferably, the composition comprises:
about 6 kg sodium carbonate; about 14 kg calcium hydroxide; about 5 kg starch; about 25 kg sodium hydroxide; about 2.5 kg raw glycerol; and about 160 I water; wherein the composition has a viscosity of about 34 600 cPs.
The composition may include about 0% to 1% w/w zinc phosphate.
The composition may comprise: about 3% w/w sodium carbonate; about 7% w/w calcium hydroxide; about 2% w/w starch; about 12% w/w sodium hydroxide; about 1% w/w raw glycerol; about 1% w/w zinc phosphate about 74% w/w water; and wherein the composition has a viscosity of about 34 600 cPs.
Preferably, the composition comprises about 6 kg sodium carbonate; about 14 kg calcium hydroxide; about 5 kg starch; about 25 kg sodium hydroxide; about 2.5 kg raw glycerol; about 1 .8 kg w/w zinc phosphate; about 160 I water; and wherein the composition has a viscosity of about 34 600 cPs.
Surprisingly, it has been found that the addition of a retardant such as raw glycerol during the manufacturing of the composition reduces the time it takes the composition to dry once it is applied to a surface.
The surface can be any surface for which paint/paint coating has previously been applied, including a metal, wood, concrete, and asbestos. Preferably the surface is a metal roof.
The calcium hydroxide used is preferably brown/white hydrated lime. The starch is preferably, corn starch (food grade), and sodium hydroxide is caustic soda (NaOH 99%).
The composition for stripping paint from a surface is manufactured using the following steps:
(a) providing a mixture of water and sodium carbonate;
(b) blending the mixture of step (a) to produce a blended mixture;
(c) adding calcium hydroxide to the blended mixture of step (b), and blending the mixture to produce a blended mixture of water, sodium carbonate and calcium hydroxide;
(d) optionally adding a retardant and/or zinc phosphate to the blended mixture of step (c), and blending the mixture further;
(e) adding starch to the blended mixture of step (c) or (d), and blending the mixture even further;
(f) leaving the blended mixture of step (e) open to allow the mixture to settle; and
(g) breaking the mixture of step (f), and re-blending the mixture to produce a smooth, consistent composition.
Steps (b) to (d) further include blending the mixtures using an electric mixer at a speed of about 700 rpm for about 5 minutes.
In step (e) the mixture is blended using an electric mixer at a speed of about 700 rpm for about 10 minutes.
Preferably, the blended mixture of step (f) is left open for about 48 to 72 hours depending on ambient temperature to allow the mixture to settle. After 48 or 72 hours depending on ambient temperature, break the settled product and mix the product again using an electric mixer on medium speed to produce a smooth consistent composition.
The composition for stripping paint from a metal roof may also be supplied as a kit, comprising of the said composition, and a cover.
Preferably, the cover is a low density polyethylene sheet. The low density polyethylene sheet may be washed and re-used.
The paint stripper composition is applied to a surface using the following steps:
(a) providing a composition to be applied to a surface;
(b) applying the composition of step (a) to the surface;
(c) immediately covering the surface containing the composition with a cover (as shown in Figure 1 );
(d) after about 24 hours to 48 hours, partially removing the cover from an area of the covered surface, and scraping the uncovered surface to remove paint/paint coatings from the surface (as shown in Figure 2) ;
(e) repeating step (d) until the entire covered surface is uncovered, and paint coatings are scraped off from the whole surface; and
(f) washing the paint coatings of step (d) or (e) with water and/or with a cleaning apparatus and detergent (as shown in Figure 3).
Preferably, the composition is applied in 1 ,5-meter strips at a time, and covered at once.
The method of manufacturing a paint stripper composition, and applying the paint stripper composition to a metal roof, will now be further described more fully with reference to the below non-limiting embodiment:
Example 1 : Manufacturing method for a paint stripper composition
Components
Per 180-liter Batch
• 160 1 Clean Water
• 6 kg Soda ash dense
• 14 kg Brown/white hydrated lime (Calcium hydroxide)
• 5 kg Corn starch (food grade)
• 25 kg Caustic soda (NaOH 99%)
• 2.5 kg Raw Glycerol (retardant)
Step by step mixing method
1 . Put water into 200lt drum
2. Add soda ash slowly to drum
3. Put electric mixer on low speed and mix for 5 minutes
4. Add brown or white hydrated lime and mix for 5 minutes on low speed
5. Add caustic soda slowly and mix for 5 minutes on low speed
6. Add raw glycerol and/or zinc phosphate and mix at low speed
7. Add corn starch and mix for 10 minutes low speed
8. Leave mixture open to stand for 48 to 72 hours to settle depending on ambient temperature
9. Break product up with flat wooden paddle/rafter (76x50mm) then mix again with electric mixer on medium speed until smooth consistency
10. Decan product into plastic 5LT/20LT pales
Step by step application method of the paint stripper composition
1. Make sure all persons working with the paint stripper composition have proper personal protective equipment (see Figure 4 for the recommended personal protective equipment).
2. Always have neutralizer (White Vinegar) on hand for spillages or when product gets in contact with skin or eyes.
3. Always make sure that the correct safety precautions are adhered to on dangerous workplaces.
4. Pre-cut cover sheets (LDPE Low density polyethylene 60 microns) to correct size in order to cover the WB Roof Paint Stripper.
5. Make sure all movable assets have been moved away from direct working area in advance and cover all plants and valuables that can’t be moved away.
6. Always work in the opposite direction to which the WB Roof Paint Stripper is applied and apply with soft nylon broom to ±1 .2lt per m2 and do not walk on the applied area (it will be slippery). The WB Roof Paint Stripper must be applied in 1 ,5m strips at a time and covered at once.
7. Use normal cement bricks to anchor the cover sheeting on roof that it doesn’t blow around or get affected by weather elements.
8. Repeat the process with an overlap of 200mm and 200mm over ridging to the desired roof area being stripped.
9. Two teams of two persons must apply the full system. First one (1 ) person applies the product and the other three (3) close product with cover sheets and anchor with normal cement bricks.
10. Particularly important to make sure sheeting is anchored properly.
1 1. After 24 hours do a test and open a corner and scrape with scraper to see if paint is coming off, if not leave another 24 hours and repeat test. Generally, after (3) days all the layers of old roof coatings will have softened and will be easy to remove.
12. Remove cover sheets and bricks and dispose of safely alternatively it may be washed and re-used.
13. Hydro wash with HP Cleaner 2500-3000psi with rotating nozzle to remove the old roof coatings and then rinse with clean water.
14. If the building has gutters rinse and clean the gutters with clean water.
15. Once hydro washing of roof area has been completed. Wash roof with general purpose cleaner and rinse all other areas that have been affected, such as plants and paving if necessary.
Units which are used in this specification and which are not in accordance with the metric system may be converted to the metric system with the aid of the following conversion factors: 1 centipoise (cP) = 1 x 10’3 Pa.s, and 1 psi = 6,895 x 103 Pa .
Advantages of the water based roof paint stripper composition and/or method
The entire WB Roof Paint Stripper system saves time, labour and is in the long run more cost effective.
• For example, a 500m2 roof will take approximately five (5) days to apply the complete WB Roof Paint Stripper process to get old flacking paint back to bare metal. Where normally it would take 1 .5 to 2 weeks to mechanically sand, grind and scrap any old paint coatings off surfaces. This older method leaves ±70% of the old coatings stay and the paint coatings that have been left behind has been weakened by friction in this process.
• Anti-corrosive primers have been designed to apply to metal and for corrosion but not designed to apply on old flaking roof coatings.
• With WB Roof Paint Stripper applications, you don’t have failed coatings on top of failed coatings that has been built up over time.
• The WB Roof Paint Stripper system is more effective as it is always going back to bare metal, rust treat where necessary, prime and overcoat with roof coat on specification will make any roof coating lifespan last longer.
• Many manufacturers will back out of a claim that may arise due to failure of roof coatings. It’s always the preparation that is not done properly to manufacturers specifications that causes roof coating failures. Going back to bare metal is always the best choice for any coating to adhere to substrate.
• Corrosion creeps under old roof coatings when the application is not done according to manufacturer specifications and is not always visible once the roof has been re-painted. By using WB Roof Paint Stripper and taking the roof back to bare metal you can prevent comebacks due to corrosion resurfacing through the new system.
Claims
CLAIMS An aqueous composition for stripping paint from a surface, wherein the composition includes:
(a) Sodium carbonate about 2% to 4% w/w;
(b) Calcium hydroxide about 5% to 9% w/w;
(c) Starch about 1 % to 3% w/w;
(d) Sodium hydroxide about 10% to 14% w/w, and
(e) the balance is water, and the composition has a viscosity of about 30 000 to 40 000 centipoise (cPs). The composition of claim 1 , wherein starch is corn starch. The composition of claim 1 or 2, including:
(a) about 3% w/w sodium carbonate;
(b) about 7% w/w calcium hydroxide;
(c) about 2% w/w corn starch;
(d) about 12% w/w sodium hydroxide; and
(e) about 76% w/w water, and wherein the composition has a viscosity of about 33 000 to 36 000 cPs. The composition of claim 3, wherein the composition includes:
(a) about 6 kg sodium carbonate;
(b) about 14 kg calcium hydroxide;
(c) about 5 kg corn starch;
(d) about 25 kg sodium hydroxide; and
(e) about 160 I of water, and wherein the composition has a viscosity of about 33 000 to 36 000 cPs. The composition of claim 1 or 2, further including a retardant.
The composition of claim 5, wherein the retardant is raw glycerol. The composition of claim 6, wherein the composition includes:
(a) about 3% w/w sodium carbonate;
(b) about 7% w/w calcium hydroxide;
(c) about 2% w/w corn starch;
(d) about 12% w/w sodium hydroxide;
(e) about 1% w/w raw glycerol; and
(f) about 75% w/w water; and wherein the composition has a viscosity of about 34 600 cPs. The composition of claim 7, wherein the composition includes:
(a) about 6 kg sodium carbonate;
(b) about 14 kg calcium hydroxide;
(c) about 5 kg corn starch;
(d) about 25 kg sodium hydroxide;
(e) about 2.5 kg raw glycerol; and
(f) about 160 I water; and wherein the composition has a viscosity of about 34 600 cPs. The composition of claim 6, further including zinc phosphate. The composition of claim 9, wherein the composition includes:
(a) about 3% w/w sodium carbonate;
(b) about 7% w/w calcium hydroxide;
(c) about 2% w/w corn starch;
(d) about 12% w/w sodium hydroxide;
(e) about 1% w/w raw glycerol;
(f) about 1% w/w zinc phosphate;
(g) about 74% w/w water; and wherein the composition has a viscosity of about 34 600 cPs.
1 1 . The composition of claim 10, wherein the composition includes:
(a) about 6 kg sodium carbonate;
(b) about 14 kg calcium hydroxide;
(c) about 5 kg corn starch;
(d) about 25 kg sodium hydroxide;
(e) about 2.5 kg raw glycerol;
(f) about 1 .8 kg w/w zinc phosphate;
(g) about 160 I water; and wherein the composition has a viscosity of about 34 600 cPs.
12. A method of manufacturing a paint stripper composition including the steps of:
(a) providing a mixture of water and sodium carbonate;
(b) blending the mixture of step (a) to produce a blended mixture;
(c) adding calcium hydroxide to the blended mixture of step (b), and blending the mixture to produce a blended mixture of water, sodium carbonate and calcium hydroxide;
(d) optionally adding a retardant and/or zinc phosphate to the blended mixture of step (c), and blending the mixture further;
(e) adding starch to the blended mixture of step (c) or (d), and blending the mixture even further;
(f) leaving the blended mixture of step (e) open to allow the mixture to settle; and
(g) breaking the mixture of step (f), and re-blending the mixture to produce a smooth, consistent composition.
The method of claim 12, wherein steps (b) to (d) further include blending the mixtures using an electric mixer at a speed of about 700 revolutions per minute (rpm) for about to 5 minutes. The method of claim 12 or 13, wherein step (e) further includes blending the mixture using an electric mixer at a speed of about 700 rpm for about 10 minutes. The method of any one of claims 12 to 14, wherein the blended mixture of step (f) is left open for about 48 to 72 hours depending on ambient temperature to allow the mixture to settle. A kit including:
(a) The composition of any one of claims 1 to 1 1 ; and
(b) a cover. The kit of claim 16, wherein the cover is a low density polyethylene sheet. A method of applying the composition of any one of claims 1 to 1 1 , wherein the method comprises of the following steps:
(a) providing a composition to be applied to a surface;
(b) applying the composition of step (a) to the surface;
(c) immediately covering the surface containing the composition with a cover;
(d) after about 24 hours to 48 hours, partially removing the cover from an area of the covered surface, and scraping the uncovered surface to remove paint/paint coatings from the surface;
(e) repeating step (d) until the entire covered surface is uncovered, and paint coatings are scraped off from the whole surface; and
(f) washing the paint coatings of step (d) or (e) with water and/or with a cleaning apparatus and detergent.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ZA2022/09134 | 2022-08-16 | ||
ZA202209134 | 2022-08-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2024038383A1 true WO2024038383A1 (en) | 2024-02-22 |
Family
ID=89941375
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2023/058210 WO2024038383A1 (en) | 2022-08-16 | 2023-08-16 | A water based paint stripper composition, and method of manufacturing the composition |
Country Status (1)
Country | Link |
---|---|
WO (1) | WO2024038383A1 (en) |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2069522A (en) * | 1980-02-15 | 1981-08-26 | Sterwin Ag | Paint strippers |
US5098591A (en) * | 1989-06-30 | 1992-03-24 | Stevens Sciences Corp. | Paint stripper and varnish remover compositions containing organoclay rheological additives, methods for making these compositions and methods for removing paint and other polymeric coatings from flexible and inflexible surfaces |
WO1997038057A1 (en) * | 1996-04-05 | 1997-10-16 | Ve.Co S.R.L. | Neutral removers of paint from essentially metallic surfaces |
US20060258555A1 (en) * | 2005-05-12 | 2006-11-16 | The Lubrizol Corporation | Oil-in-water emulsified remover |
US20080139437A1 (en) * | 2006-11-10 | 2008-06-12 | Power John W | Ether-containing paint removing composition |
US20130202544A1 (en) * | 2010-04-30 | 2013-08-08 | Isp Investments Inc. | Thickened compositons of high ph |
CN106554654A (en) * | 2015-09-29 | 2017-04-05 | 牛誉博 | Environment-friendly type low valent metal paint stripper and preparation method thereof |
US9834689B2 (en) * | 2013-05-24 | 2017-12-05 | Enthone Inc. | Aqueous stripping composition for metal surfaces |
US20220117877A1 (en) * | 2018-07-06 | 2022-04-21 | Hfc Prestige International Holding Switzerland S.A.R.L | MULTICOMPONENT COMPOSITION (Michael Addition) |
-
2023
- 2023-08-16 WO PCT/IB2023/058210 patent/WO2024038383A1/en unknown
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2069522A (en) * | 1980-02-15 | 1981-08-26 | Sterwin Ag | Paint strippers |
US5098591A (en) * | 1989-06-30 | 1992-03-24 | Stevens Sciences Corp. | Paint stripper and varnish remover compositions containing organoclay rheological additives, methods for making these compositions and methods for removing paint and other polymeric coatings from flexible and inflexible surfaces |
WO1997038057A1 (en) * | 1996-04-05 | 1997-10-16 | Ve.Co S.R.L. | Neutral removers of paint from essentially metallic surfaces |
US20060258555A1 (en) * | 2005-05-12 | 2006-11-16 | The Lubrizol Corporation | Oil-in-water emulsified remover |
US20080139437A1 (en) * | 2006-11-10 | 2008-06-12 | Power John W | Ether-containing paint removing composition |
US20130202544A1 (en) * | 2010-04-30 | 2013-08-08 | Isp Investments Inc. | Thickened compositons of high ph |
US9834689B2 (en) * | 2013-05-24 | 2017-12-05 | Enthone Inc. | Aqueous stripping composition for metal surfaces |
CN106554654A (en) * | 2015-09-29 | 2017-04-05 | 牛誉博 | Environment-friendly type low valent metal paint stripper and preparation method thereof |
US20220117877A1 (en) * | 2018-07-06 | 2022-04-21 | Hfc Prestige International Holding Switzerland S.A.R.L | MULTICOMPONENT COMPOSITION (Michael Addition) |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN103553538B (en) | Architecture indoor percdation solidifies not damaged waterproofing agent | |
CN112412091A (en) | Repair method of bare concrete of load-bearing structure | |
CN103774862A (en) | Construction method for applying one-component polyurethane to renovation and reconstruction of old hard waterproof roof | |
CN106592926A (en) | Construction method for epoxy micro-coarse self-leveling floor paint | |
US5814693A (en) | Coatings for concrete containment structures | |
KR101478946B1 (en) | The waterproof construction method for concrete structure using the membrane agent | |
KR102361953B1 (en) | As it is removed using a pneumatic chipping device, there is little damage to the existing structure, and a polymer mortar with an excellent blending ratio is installed with a spraying device, and a finishing protection material is applied in a uniform coating method to improve adhesion | |
WO2024038383A1 (en) | A water based paint stripper composition, and method of manufacturing the composition | |
KR102336590B1 (en) | Concrete section repair and reinforcement method | |
CN1163915A (en) | Composite water-proof paint | |
WO1992005224A1 (en) | Paint system for removing paint | |
KR101836131B1 (en) | Water-repellent process of building and whitening-removal agents used the same | |
CN108947382A (en) | Weather-proof nano-silicon marine glue | |
US8901229B2 (en) | Roof coating containing paint and method of making | |
CN1477276A (en) | Boundary surface permeable surface layer sealing agent construction method | |
JP4349554B2 (en) | Method for attaching a coating to a substrate | |
CN112295882A (en) | Efficient electrostatic spraying process for sheet metal shell of electric control cabinet | |
JPH0451592B2 (en) | ||
KR20210026423A (en) | Crack repair material and method of waterproofing using thereof | |
US9446437B1 (en) | Methods of cleaning and protecting surfaces and isolating volumes | |
JP2923191B2 (en) | Sealer composition and building exterior finishing structure using the same | |
US4832865A (en) | Composition containing non-ionic surfactant | |
KR102412554B1 (en) | Hybrid excrement resistance anticorrosion material composition, preparation thereof, and anticorroosion method of structure for cattle shed using the same | |
Wright | Removing Paint from Old Buildings | |
KR102067248B1 (en) | Composition for removing paint film or gasket with aerosol type |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 23854607 Country of ref document: EP Kind code of ref document: A1 |