CA1156389A - Anti-corrosion organic polyurethane impregnant coating compositions - Google Patents
Anti-corrosion organic polyurethane impregnant coating compositionsInfo
- Publication number
- CA1156389A CA1156389A CA000347203A CA347203A CA1156389A CA 1156389 A CA1156389 A CA 1156389A CA 000347203 A CA000347203 A CA 000347203A CA 347203 A CA347203 A CA 347203A CA 1156389 A CA1156389 A CA 1156389A
- Authority
- CA
- Canada
- Prior art keywords
- weight
- toluene
- methyl isobutyl
- isobutyl ketone
- composition
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Paints Or Removers (AREA)
Abstract
Abstract of the Disclosure The invention relates to a coating composition containing a polyurethane resin derived from diisocyanates as well as methyl isobutyl ketone and toluene, the improvement residing in that the composition consists of 20 to 40 % by weight of polyurethane resin derived from diisocyanates, 20 to 40 % by weight of methyl isobutyl ketone, and 20 to 40 % by weight of toluene. The composition provides a highly diffusive, anti-corrosive coating which can be applied to a variety of substrates, such as metals, wood and masonry and also has the advantage that it can be applied even to a moist or wet surface.
Description
This invention relates to a coating co~position which is adapted to protect a corrodible substrate against corrosion and contains a polyurethaneresin derived from diisocyanates as well as methyl isobutyl ketone and toluene.
The known anticorrosive compositions are not entirely satis-factory either because they are restricted in application to specific materials or can be applied only to a specially prepared substrate and cannot be applied to moist or wet substrates or because they have no good a & erence or are not resistant to acids or alkaline solutions or to mechanical stress or because their application to the substrate involves a relatively high expenditure. For these reasons, the known anticorrosive compositions have no universal utility.
Known polyurethane paints contain mixed solvents consisting of toluene and methyl isobutyl ketone in addition to other solvents.
Because paints are mainly used to form non-penetrating coatings, such paints do not suggest the provision of a highly diffusive anticorrosive composition which can be applied to a moist or wet surface.
Thus the invention seeks to provide an anticorrosive composi-tion which is of more ~niversal utility and can be made in a simple manner such as mixing, and can be applied even to a moist or wet surface. Besides, the composition should not require an additional protective coating and should ensure an effective protection of a corrodible substrate against corrosion also ~ecause the composition is highly diffusive.
According to the present invention there is provided in a coating composition containing a polyurethane resin derived from diisocyanates as well as methyl isobutyl ketone and toluene, the improvement residing in that the composition comprises 20 to 40% b~ weight of polyurethane resin derived from diisocyanates 20 to 40% by weight of methyl isobutyl ketone, and 20 to 40% ~y weight of toluene.
Owing to the use of a polyurethane resin, derived from diiso-cyanates, in the stated proportion by weight, the coating composition is particularly well compatible with moisture and has a preserving effect and adheres to moist surfaces, whether the substrate is absorbent or non-absorbent, provided that the surface is free from fat, grease and oil.
The composition has a high diffusiveness owing to its contents of methyl isobutyl ketone and toluene, which ensure that the coating composition composed of the three components stated will penetrate even into fine microcapillaries.
The coating composition according to the invention differs from paints in that it contains only the binder and solvents but is sub-stantially free from pigments and fillers. In paints, the eiffective pro-portion of binder is decreased by the pigments and fillers which are present because a certain part of the binder will adhere to and be absorbed by ~! -2-the fillers and pigments. An attempt to compensate that e~rect by an increase of the binder content o~ a paint will strongly adversely arfect the ease with which the paint can be applied. The decisive improvement afforded by the present coating com-position over paints is believed to be due to the ~act that the effect of the binder is increased owing to the absence of pigments and fillers so that the desired binder effect can be achieved with a sur-prisinglY low binder content. In con~unction wlth theabsence o~ fillers and pigments and the presence of the specific mixed solvents, that low binder oontent results in the desired high diffusiveneæs by which the coatlng composltion according to the invention differs basicall~ ~rom all paints, Depending onrtemperature, the coating composition according to the invention sets within three to ~our hours, It must not be covered by a coat o~ the same or a difrerent composition within six hours after its application. The composition will have completely cured after about 14 days and w~ll then be virtually inæoluble and rotproof, But it will afford protection agalnst corrosion on a corrodible substrate as soon as it has been applled thereto.
~he coatins formed by the composition is resistant to aclds and alkaline solutions for long periods o~
time. Experimentæ have shown that the coating ~ormed by the composition is attacked only by 96~ sulfuric acid and by aqua regia. The coating composition may also be used to bond, impregnate and/or consolidate a substrate and will form a coating which has a high resistance to ~ear and impact. The coating com~
position can be applied to an ice-free sur~ace at temperatures as low as -20C and can be applied at temperatures up to +40c.
Owing to the properties stated above, the novel coating compositlon is mainly useful on a moist substrate but obviously can be app~ied also to a dr~
substrate. Because the composition can impregnate a substaate, the need for a special cleaning of the substrate, e~g.J by sandblasting, is eliminated in many cases~
~ he coating composition is suitably applled by meanæ of brushes be¢ause the compositlon is in-soluble when it has set, For this reason anY hoses and spraying equipment used to apply the composition must be cleaned before the composition has set therein.
Because the coating composition can be applied direct to a moist substrate, the composition is particularlY desirable for use in shipbuilding and in the maintenance of ships, also in the construction of boilers, tanks and other containers and vessels and of tubular structures and structural steelwork ln general~
The coating composition according to the invention can be applied not onlY to ~errous and non-ferrous metals for protection against corrosion but also to all other substrate materials. The novel coating composition opens up new possibllities particularly in the building trade because the composition can be applied with good success also to moist concrete, moist masonry and wood so that substrates of such materials can also be effectively protected~
The proportions by weight o~ the three components of the coating composition can be varied as deslred within the stated limits~ Particularly good results will be obtained if the three components are used ln equal proportions by weight~
The known anticorrosive compositions are not entirely satis-factory either because they are restricted in application to specific materials or can be applied only to a specially prepared substrate and cannot be applied to moist or wet substrates or because they have no good a & erence or are not resistant to acids or alkaline solutions or to mechanical stress or because their application to the substrate involves a relatively high expenditure. For these reasons, the known anticorrosive compositions have no universal utility.
Known polyurethane paints contain mixed solvents consisting of toluene and methyl isobutyl ketone in addition to other solvents.
Because paints are mainly used to form non-penetrating coatings, such paints do not suggest the provision of a highly diffusive anticorrosive composition which can be applied to a moist or wet surface.
Thus the invention seeks to provide an anticorrosive composi-tion which is of more ~niversal utility and can be made in a simple manner such as mixing, and can be applied even to a moist or wet surface. Besides, the composition should not require an additional protective coating and should ensure an effective protection of a corrodible substrate against corrosion also ~ecause the composition is highly diffusive.
According to the present invention there is provided in a coating composition containing a polyurethane resin derived from diisocyanates as well as methyl isobutyl ketone and toluene, the improvement residing in that the composition comprises 20 to 40% b~ weight of polyurethane resin derived from diisocyanates 20 to 40% by weight of methyl isobutyl ketone, and 20 to 40% ~y weight of toluene.
Owing to the use of a polyurethane resin, derived from diiso-cyanates, in the stated proportion by weight, the coating composition is particularly well compatible with moisture and has a preserving effect and adheres to moist surfaces, whether the substrate is absorbent or non-absorbent, provided that the surface is free from fat, grease and oil.
The composition has a high diffusiveness owing to its contents of methyl isobutyl ketone and toluene, which ensure that the coating composition composed of the three components stated will penetrate even into fine microcapillaries.
The coating composition according to the invention differs from paints in that it contains only the binder and solvents but is sub-stantially free from pigments and fillers. In paints, the eiffective pro-portion of binder is decreased by the pigments and fillers which are present because a certain part of the binder will adhere to and be absorbed by ~! -2-the fillers and pigments. An attempt to compensate that e~rect by an increase of the binder content o~ a paint will strongly adversely arfect the ease with which the paint can be applied. The decisive improvement afforded by the present coating com-position over paints is believed to be due to the ~act that the effect of the binder is increased owing to the absence of pigments and fillers so that the desired binder effect can be achieved with a sur-prisinglY low binder content. In con~unction wlth theabsence o~ fillers and pigments and the presence of the specific mixed solvents, that low binder oontent results in the desired high diffusiveneæs by which the coatlng composltion according to the invention differs basicall~ ~rom all paints, Depending onrtemperature, the coating composition according to the invention sets within three to ~our hours, It must not be covered by a coat o~ the same or a difrerent composition within six hours after its application. The composition will have completely cured after about 14 days and w~ll then be virtually inæoluble and rotproof, But it will afford protection agalnst corrosion on a corrodible substrate as soon as it has been applled thereto.
~he coatins formed by the composition is resistant to aclds and alkaline solutions for long periods o~
time. Experimentæ have shown that the coating ~ormed by the composition is attacked only by 96~ sulfuric acid and by aqua regia. The coating composition may also be used to bond, impregnate and/or consolidate a substrate and will form a coating which has a high resistance to ~ear and impact. The coating com~
position can be applied to an ice-free sur~ace at temperatures as low as -20C and can be applied at temperatures up to +40c.
Owing to the properties stated above, the novel coating compositlon is mainly useful on a moist substrate but obviously can be app~ied also to a dr~
substrate. Because the composition can impregnate a substaate, the need for a special cleaning of the substrate, e~g.J by sandblasting, is eliminated in many cases~
~ he coating composition is suitably applled by meanæ of brushes be¢ause the compositlon is in-soluble when it has set, For this reason anY hoses and spraying equipment used to apply the composition must be cleaned before the composition has set therein.
Because the coating composition can be applied direct to a moist substrate, the composition is particularlY desirable for use in shipbuilding and in the maintenance of ships, also in the construction of boilers, tanks and other containers and vessels and of tubular structures and structural steelwork ln general~
The coating composition according to the invention can be applied not onlY to ~errous and non-ferrous metals for protection against corrosion but also to all other substrate materials. The novel coating composition opens up new possibllities particularly in the building trade because the composition can be applied with good success also to moist concrete, moist masonry and wood so that substrates of such materials can also be effectively protected~
The proportions by weight o~ the three components of the coating composition can be varied as deslred within the stated limits~ Particularly good results will be obtained if the three components are used ln equal proportions by weight~
Claims (9)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a coating composition containing a polyurethane resin derived from diisocyanates as well as methyl isobutyl ketone and toluene, the improvement residing in that the composition comprises 20 to 40% by weight of polyurethane resin derived from diisocyanates, 20 to 40% by weight of methyl isobutyl ketone, and 20 to 40% by weight of toluene.
2. The improvement set forth in claim 1, in which said composi-tion is free from fillers and pigments.
3. The improvement set forth in claim 1, in which said composition consists only of said polyurethane resin, methyl isobutyl ketone, and toluene.
4. The improvement set forth in claim 1, in which said composition contains said polyurethane resin, said methyl isobutyl ketone, and said toluene in substantially equal proportions by weight.
5. In a process of coating a substrate by applying thereto a coat-ing composition containing a polyurethane resin derived from diisocyanates as well as methyl isobutyl ketone and toluene, the improvement residing in that a composition is applied which comprises 20 to 40% by weight of poly-urethane resin derived from diisocyanates, 20 to 40% by weight of methyl isobutyl ketone, and 20 to 40% by weight of toluene.
6. The improvement set forth in claim 5 in which said composition consists only of said polyurethane resin, methyl isobutyl ketone, and toluene.
7. The improvement set forth in claim 5 or 6, in which said com-position is applied to a substrate of a corrodible material to protect the same against corrosion.
8. In a process of coating and impregnating an impregnatable substrate by applying thereto a coating composition containing a polyure-thane resin derived from diisocyanates as well as methyl isobutyl ketone and toluene, the improvement residing in that a composition is applied which comprises 20 to 40% by weight of polyurethane resin derived from diisocyanates, 20 to 40% by weight of methyl isobutyl ketone, and 20 to 40% by weight of toluene.
9. The improvement set forth in claim 8 in which said composition consists only of said polyurethane resin, methyl isobutyl ketone, and toluene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000347203A CA1156389A (en) | 1980-03-07 | 1980-03-07 | Anti-corrosion organic polyurethane impregnant coating compositions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000347203A CA1156389A (en) | 1980-03-07 | 1980-03-07 | Anti-corrosion organic polyurethane impregnant coating compositions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1156389A true CA1156389A (en) | 1983-11-01 |
Family
ID=4116429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000347203A Expired CA1156389A (en) | 1980-03-07 | 1980-03-07 | Anti-corrosion organic polyurethane impregnant coating compositions |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1156389A (en) |
-
1980
- 1980-03-07 CA CA000347203A patent/CA1156389A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |