CA1200258A - Acrylic polymer portland cement coating composition - Google Patents
Acrylic polymer portland cement coating compositionInfo
- Publication number
- CA1200258A CA1200258A CA000440157A CA440157A CA1200258A CA 1200258 A CA1200258 A CA 1200258A CA 000440157 A CA000440157 A CA 000440157A CA 440157 A CA440157 A CA 440157A CA 1200258 A CA1200258 A CA 1200258A
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- CA
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- Prior art keywords
- portland cement
- coating composition
- weight
- acrylic polymer
- propylene glycol
- 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.)
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Abstract
ABSTRACT OF THE DISCLOSURE
An improved coating composition including an aqueous dispersion of an acrylic polymer, type 1 Portland cement, sand, an aqueous solution of propylene glycol, and a defoaming agent in which the Portland cement and sand comprise about 75% of the composition and wherein the solution of propylene glycol is present in an amount enabling the acrylic solids of the dispersion of acrylic polymers to be coated thereby.
An improved coating composition including an aqueous dispersion of an acrylic polymer, type 1 Portland cement, sand, an aqueous solution of propylene glycol, and a defoaming agent in which the Portland cement and sand comprise about 75% of the composition and wherein the solution of propylene glycol is present in an amount enabling the acrylic solids of the dispersion of acrylic polymers to be coated thereby.
Description
[)(3~.51~
ACRYLIC POLYMER PORTLAND CEMENT COATING COMPOSITION
Background of the Invention (1) ~ield oP the Invention This invention relates to improving -the flexibility, abrasion and heat resistance and particularly shear bond (adhesive) characteristics of acrylic polymer Portland cement coating compositions.
ACRYLIC POLYMER PORTLAND CEMENT COATING COMPOSITION
Background of the Invention (1) ~ield oP the Invention This invention relates to improving -the flexibility, abrasion and heat resistance and particularly shear bond (adhesive) characteristics of acrylic polymer Portland cement coating compositions.
(2) Descrlp-tion of the Prior Ar-t:
The prior art is represented by U.S. Patent 4,263,372, which discloses the use of dicyclopentenyl acrylic or methacrylate or a mixture thereof as a hydrophoblc binder material in various particulate aggregate sys-tems in conjunction with cementitious materials such as hydraulic cements.
Patent 4,329,822 discloses a filled polymeric wall facing unit in which a polyester composition such as unsaturated poly-merizable polyester resin filled with sand as a sui-table filler material and wherein the polymeric composition is applied to a building block which may be of concrete.
Patent 4,031,282 discloses a similar coating material incorporating a polyester resin or the like for application to improve the esthetic appearance of the object coated.
A number of patents have been issued wherein the use of a polymer in a cement is disclosed. See for example U.S.
Patents 2,648,645, 3,239,479, 3,937,633, 4,060,425 and 4,211,572.
In Patent 2,648,645, polyvinyl alcohol in a Portland cement composition is disclosed as being capable of reducing water loss from a slurry.
28 Patent 3,937,633 discloses the use of a polymer in a
The prior art is represented by U.S. Patent 4,263,372, which discloses the use of dicyclopentenyl acrylic or methacrylate or a mixture thereof as a hydrophoblc binder material in various particulate aggregate sys-tems in conjunction with cementitious materials such as hydraulic cements.
Patent 4,329,822 discloses a filled polymeric wall facing unit in which a polyester composition such as unsaturated poly-merizable polyester resin filled with sand as a sui-table filler material and wherein the polymeric composition is applied to a building block which may be of concrete.
Patent 4,031,282 discloses a similar coating material incorporating a polyester resin or the like for application to improve the esthetic appearance of the object coated.
A number of patents have been issued wherein the use of a polymer in a cement is disclosed. See for example U.S.
Patents 2,648,645, 3,239,479, 3,937,633, 4,060,425 and 4,211,572.
In Patent 2,648,645, polyvinyl alcohol in a Portland cement composition is disclosed as being capable of reducing water loss from a slurry.
28 Patent 3,937,633 discloses the use of a polymer in a
3-s~
cement slurry for reducing the water ]oss theIefrom.
Patent 3,239,~79 cliscloses a Portland type cement contain-ing a latex, such as a polymer, in which the composition is intended -to retard the setting time of the composition.
Patent 4,060,~25 discloses a Portland cement mixture incorporating a halogen atom with one or more short range strength accelerators such as calcium alumi.nate and ethylene glycol together with a bituminous emulsion. The patent discloses the substitution of a rubber latex and a resin emulsion -for the bituminous material and the result obtained is a rapid hardening cementitious mixture. The product is noted as being useful as a grout whi.ch has elastic properties for a slab-type track structure.
Patent ~,211,572 discloses a dry se-t mortar in which the water retentive agents such as cellulose ethers are improved by the addition of small amounts of ethylene glycol or the like. The present invention produces a Portland cement coating composition consisting of sand, Portland cement,an acrylic polymer, a defoamer and a critical amount o-f propylene glycol.
The resulting coating material has an unusual and unexpected shear bond characteristic when applied to concrete, wood, hard-board, metal, glass and other materials with unusual and unexpected flexibility along with high abrasion and heat resistance. The addition of a coloring agent to the coating composition such as any of the food coloring agents commercially supplied in an aqueous solution usually incorporating propylene glycol enables the essential propylene gylcol ingredien+ and -the color 28 ingredient to be combined and added to the composition and wherein 5~
the color ingredient provides color coding in the mixture when the composition is mixecl with water to provide the desired consis-tency for application to -the article being coated, for example a low slump consistency suitable for resurfacing concrete walkways, pavements, and -the like, the color coding serving during the mixing process to indicate the presence of a desirable amount O:e water in the mixture with the color carrying over into the set coating and eventually disappearing.
Summary of the Inven-tion A consistently fle~ible acrylic polymer Portland cement coating composition having unusual shear bond (adhesive) characteristics and unusually high abrasion and heat resistance is capable of safe and economic manufacture and can be con-veniently mixed to a desired consistency with water and used in coating many materials to provide a highly desirable weather, wear, and heat resistant coating that remains bonded to the substrate material despite flexing of -the same,incorporates sand, ; Portland cement, acrylic polymer, propylene glycol and a defoamer, a typical batch may comprise 53 6% by weight sand, 30.7% by weight Type I Portland cement, either white or gray, 6.3%
acrylic polymer, .015% propylene glycol, . 2/o defoamer and 9.11%
water. The propylene glycol may and preferably does contain a color additive.
Description of the Preferred Embodiment The composition of -this invention is a material which may be generally termed an acrylic polymer Portland cement coating composition particularly suitable for forming thin, unusually 28 durable coatings on concrete such as sidewalks and pavements, J~5~
concrete bloclc walls, wood panels, hardboards, metal panels as used in walls, floors, ceilings and roo~ structures in various constructions and glass panes or panels such as for example where a light blocking coating is applied to part o~
a glass pane or panel in a decorative manner with the coating material remaining permanently affixed to the glass pane or panel by its unusual shear bond characteris-tic.
The composition of this invention in a typical wet mix batch totaling 26.10 pounds incorporates 141bs. oI sand, 8 lbs. o~ Po.rtland cement (white) Type I,1.681bs. acrylic polymer, 1.60 grams propylene glycol, 20 grams liquid defoamer and 38 ounces of water , the acrylic polymer is a water dispersion with the acrylic solids comprising 48%. ~ suitable acrylic poly-mer is commercial available as R~IOPLEX ~qC-76 ~rom Rohm and IIaas Company of Philadelphia, Pennsylvani.a 19105, and the defoamer is a liquid commercially available as NOPCO NXZ (100% active~ from Process Chemicals Division of Diamond Shamrock Corporation.
Morristown, New Jersey 07960. Dimethylpolysiloxane is suitable.
. The sand in the foregoing example is pre~erably silica sand, known in the trade as No. 1 ~ ROC D~Y as commercially available from Pennsylvania ~lass Co;, Pittsburgh, Pa. 15235, a san~blasting grade.
The Portland cement Type I white is commercially available from Medusa Cement Company, Division o~ Medusa Corpora-tion.
Cleveland, Ohio.
The propylene glycol is an aqueous solution in which the propylene glycol comprises 16% by weight with a 2.5~o coloring agent added. It is available from Durkee Famous Foods, Division ~8 f SCM Corporation, Cleveland, Ohio.
The acrylic polymer herein referred -to may be an acrylic resin such as a thermal plastic polymer or co-polymer o-f acrylic acid, methacrylic acid, esters of these acids or acrylonitrile.
The propylene glycol herein referred to may be 1,2 propylene (1,2 dihydroxy propane), 1,2 propanediol, methylene glycol, or methyl glycol, and acts as a wetting agen-t, humectant and emulsifier in modify.ing the acrylic pol.ymer so as to enable it to coat each grain of the silica sand in the wet mix of the Portland cement coating composition and flexibly bond the sand with the finely divided Portland cement par-ticles.
In preparing the cement coating composition, thoroughly premix the sand and cement, thoroughly blend together the wa-ter dispersion of the acrylic polymer, the aqueous solution of the propylene glycol, the liquid defoaming agent, and -the water, and add to the premixed sand and cement. The entire composition is then mixed thoroughly for from three to four minutes. The water content may be varied to obtain the desired consistency for the coating application, that is, trowel or spray. This is best performed by withholding a portion of the water from the initial mix and adding it as necessary to obtain the desired consistency of the coating composition.
The amount of acrylic polymer in the above example is based on cement weight and desired results. Acrylic dispersion to cement ratio would be a minimum of 10% and a maximum of ~0%.
The percentage of the propylene glycol to acrylic po]ymer is .001 and .002. The Portland cement content of the composition is relatively high compared with the usual ~ortland cement mixes.
2~ It has been de-termined that the desired performance ;~2~.325~3 properties as hereinbefore set :forth ancl con-firmed by a labora-tory report hereinafter given, are controlled by the amount of propylene glycol modifying the acrylic polymer.
An alternate composition having -the same unusual and un-expec-ted characteristics as the foregoing example may comprise the substitution of Portland cement gray Type 1 -for the white Portland cement of the above example. The Portland cemen-t gray Type 1 is also commercially available from ,~ledusa Cement Company.
The prior art relating to cemen-t additives such as acrylic polymer, is illustrated by a publication copyr:ighted in 1980 by Rohm & Haas Company with respect to its RIIOPLEX (trademark) E-330, a cement mortar modifier. This publication states that cement mortars modified with the product are hard, tough, and durable and compared with unmodified mortars, polymer modified mortars have superior flexural, adhesive and impact strength as well as excellent abrasion resistance. Proper-ties of Portland cement rnortars to which the Rohm & Haas polymer were added are reported with respect to compressive strength utilizing the American Society for Testing and ~laterials Test Standards with a sample of the concrete after a 28 day dry cure showing a reading of 5,450 p.s.i. A sample of -the Portland cement coating composition of the present invention -tested in Pittsburgh Testing Laboratory utilizing the same test method of the 28 day air cured test samples showed an average reading of 5,~10 p.s.i.
which is substantially the same as the Rohm & Haas reported test.
On flexural strength, again using a 28 day air cured sample, 28 and the same Rohn & Haas test methods, the Rohm & Haas publica-1;G~ Ll1~513 tion repor-ts a reacling of 1,355 p.s.i., whereas the Pittsburgh Testi~g Laboratory Test average on 28 day samples of the gray composition of the present invention showed a reading of 1,~70 p.s.i. and 3700 p.s.i.
on the white cement composition after 7 days air cure; a sub-stantial improvement.
On shear bond adhesion, the Rohm & lIaas publication reports tests on a. 28 day air cured sample showing a reading of 500 PSI whereas the Pi-ttsburgh Tes-ting Laboratory report on -tests of the material of the present invention in -two samples 28 day 10 air cured, provided readings of 1,025 PSI and 1,087 PSI, respec-tively, showing the obvious superiority of the Portland cement composition of the present invention.
On abrasion resistance, the Rohm & Haas publication reported tests on 28 day air cured samples showing material loss of 1.70 grams, whereas the Pittsburgh Testing Laboratory reports on the Portland cement composition of the present invention showed a loss of only 1.1183 grams which is nearly half the material loss of the Rohm & IIaas test sample and shows the obvious superiority of the Portland cement coating composition 20 of the present invention.
Those skilled in the art will observe that a Portland cement coating composition having the unique and unexpected characteristics of the composition of the present invention makes possible the production of considerably improved precast Portland cement wall, floor and roof panels for use in building constructions which are :relatively thin with respect to their overall area and thickness and are frequently used as exterior 28 surfacing materials directly exposed to temperature and weather _~_ l,"t~
changes.
The material of the present inven-tion in addition to -the highly desirable and unexpec-ted charac-teristics hereinbefore noted has an unusual fire resistance characteristic. Tests of the material subjected to a flame at 2300F. for fifteen minutes showed no visual damage whereas Portland cement compositions here-tofore known in the ar-t erup-t, crack, and show visual deterioration at considerably lower -tempera-tures.
Applications of the acrylic polymer Por-tland cemen-t coa-ting composition of the present invention are particularly useful in forming Portland cement based ornamental panels having pebble carrying surfaces as the unusual and unexpec-ted shear bond adhesion firmly locks the pebbles wllich may be various ornamental rounded stones to the panel formed of the composition. Building blocks, such as cement blocks and the like as known in the industry, are advantageously provided with a coating of -the present composition on one or more of their surfaces so that a wall formed of these units has -the unusual characteristics of the material.
Tests of the composition disclosed herein relating to the thin coating and patching of aged,worn, cracked and eroded cement sidewalks and pavements and extending for a period of more than 10 months and through a complete fall, winter and spring season show no damage to the coated areas, no spalling and no breaking away of the coating whereas comparable damaged concrete sidewalks patched with conventional Portland cement mixtures, some including acrylic polymers show substantially less shear bond adhesion with sp~lling, 2~ and breaking away of the coa-ting material in tests of the same --~.0--.5~
duration in the same location and subjected to the same weather and wear conditions.
The color codlng hereinbe-fore mentioned is advantageous in applying the Portland cement coating composition herein dis-closed, -for example utilizing a green food color additive to the propylene glycol aqueous solution causes the mixture to assume a blue color when too much water is added. When the proper amount of water is added to achieve a desirable coating consistency, the material takes on a dark green color changing to amber green as the coating sets and in several days changing again -to a light greenish brown which remains until the coating material is subjec-ted to a thorough wetting down as irom rain in a weather area, whereupon the iinal color is a light gray.
It will thus be seen that an unusual acrylic poly~er Por-tland cement coating composition has been disclosed, which due to its relatively high Portland cement content, high de-foamer conten-t and the presence of a critical amount o~
propylene glycol produces a Portland cement coating material with unusual and highly desirablè characteristics including excellent compressive strength, exceedingly high ~lexural strength, very high unexpected shear bond adhesion and retaining better than normal tensil strength and impact strength and possessing an unusually and unexpected high abrasion resistance. The material is relatively inexpensive to form, relatively easy -to mix and in the proper and desirable consistency, unusually cooperative in trowel applications or spraying applications due to :its extremely low slump and highly adhesive 28 characteristics.
.~ 3~5~;3 Changes in the amounts of acrylic po~ymer alld Portland cement may be made within certain limits provided the ratio of propylene glycol to acrylic polymer is maintained. For example, the aqueous dispersion of acrylic polymer may be used in amounts between about 5% to about 7% by weight of the total composition and the Portland cement may be used in amounts between about 23% to about 38~o by weigh-t of -the total composition.
g Having thus described my inven-tion what I claim is:
cement slurry for reducing the water ]oss theIefrom.
Patent 3,239,~79 cliscloses a Portland type cement contain-ing a latex, such as a polymer, in which the composition is intended -to retard the setting time of the composition.
Patent 4,060,~25 discloses a Portland cement mixture incorporating a halogen atom with one or more short range strength accelerators such as calcium alumi.nate and ethylene glycol together with a bituminous emulsion. The patent discloses the substitution of a rubber latex and a resin emulsion -for the bituminous material and the result obtained is a rapid hardening cementitious mixture. The product is noted as being useful as a grout whi.ch has elastic properties for a slab-type track structure.
Patent ~,211,572 discloses a dry se-t mortar in which the water retentive agents such as cellulose ethers are improved by the addition of small amounts of ethylene glycol or the like. The present invention produces a Portland cement coating composition consisting of sand, Portland cement,an acrylic polymer, a defoamer and a critical amount o-f propylene glycol.
The resulting coating material has an unusual and unexpected shear bond characteristic when applied to concrete, wood, hard-board, metal, glass and other materials with unusual and unexpected flexibility along with high abrasion and heat resistance. The addition of a coloring agent to the coating composition such as any of the food coloring agents commercially supplied in an aqueous solution usually incorporating propylene glycol enables the essential propylene gylcol ingredien+ and -the color 28 ingredient to be combined and added to the composition and wherein 5~
the color ingredient provides color coding in the mixture when the composition is mixecl with water to provide the desired consis-tency for application to -the article being coated, for example a low slump consistency suitable for resurfacing concrete walkways, pavements, and -the like, the color coding serving during the mixing process to indicate the presence of a desirable amount O:e water in the mixture with the color carrying over into the set coating and eventually disappearing.
Summary of the Inven-tion A consistently fle~ible acrylic polymer Portland cement coating composition having unusual shear bond (adhesive) characteristics and unusually high abrasion and heat resistance is capable of safe and economic manufacture and can be con-veniently mixed to a desired consistency with water and used in coating many materials to provide a highly desirable weather, wear, and heat resistant coating that remains bonded to the substrate material despite flexing of -the same,incorporates sand, ; Portland cement, acrylic polymer, propylene glycol and a defoamer, a typical batch may comprise 53 6% by weight sand, 30.7% by weight Type I Portland cement, either white or gray, 6.3%
acrylic polymer, .015% propylene glycol, . 2/o defoamer and 9.11%
water. The propylene glycol may and preferably does contain a color additive.
Description of the Preferred Embodiment The composition of -this invention is a material which may be generally termed an acrylic polymer Portland cement coating composition particularly suitable for forming thin, unusually 28 durable coatings on concrete such as sidewalks and pavements, J~5~
concrete bloclc walls, wood panels, hardboards, metal panels as used in walls, floors, ceilings and roo~ structures in various constructions and glass panes or panels such as for example where a light blocking coating is applied to part o~
a glass pane or panel in a decorative manner with the coating material remaining permanently affixed to the glass pane or panel by its unusual shear bond characteris-tic.
The composition of this invention in a typical wet mix batch totaling 26.10 pounds incorporates 141bs. oI sand, 8 lbs. o~ Po.rtland cement (white) Type I,1.681bs. acrylic polymer, 1.60 grams propylene glycol, 20 grams liquid defoamer and 38 ounces of water , the acrylic polymer is a water dispersion with the acrylic solids comprising 48%. ~ suitable acrylic poly-mer is commercial available as R~IOPLEX ~qC-76 ~rom Rohm and IIaas Company of Philadelphia, Pennsylvani.a 19105, and the defoamer is a liquid commercially available as NOPCO NXZ (100% active~ from Process Chemicals Division of Diamond Shamrock Corporation.
Morristown, New Jersey 07960. Dimethylpolysiloxane is suitable.
. The sand in the foregoing example is pre~erably silica sand, known in the trade as No. 1 ~ ROC D~Y as commercially available from Pennsylvania ~lass Co;, Pittsburgh, Pa. 15235, a san~blasting grade.
The Portland cement Type I white is commercially available from Medusa Cement Company, Division o~ Medusa Corpora-tion.
Cleveland, Ohio.
The propylene glycol is an aqueous solution in which the propylene glycol comprises 16% by weight with a 2.5~o coloring agent added. It is available from Durkee Famous Foods, Division ~8 f SCM Corporation, Cleveland, Ohio.
The acrylic polymer herein referred -to may be an acrylic resin such as a thermal plastic polymer or co-polymer o-f acrylic acid, methacrylic acid, esters of these acids or acrylonitrile.
The propylene glycol herein referred to may be 1,2 propylene (1,2 dihydroxy propane), 1,2 propanediol, methylene glycol, or methyl glycol, and acts as a wetting agen-t, humectant and emulsifier in modify.ing the acrylic pol.ymer so as to enable it to coat each grain of the silica sand in the wet mix of the Portland cement coating composition and flexibly bond the sand with the finely divided Portland cement par-ticles.
In preparing the cement coating composition, thoroughly premix the sand and cement, thoroughly blend together the wa-ter dispersion of the acrylic polymer, the aqueous solution of the propylene glycol, the liquid defoaming agent, and -the water, and add to the premixed sand and cement. The entire composition is then mixed thoroughly for from three to four minutes. The water content may be varied to obtain the desired consistency for the coating application, that is, trowel or spray. This is best performed by withholding a portion of the water from the initial mix and adding it as necessary to obtain the desired consistency of the coating composition.
The amount of acrylic polymer in the above example is based on cement weight and desired results. Acrylic dispersion to cement ratio would be a minimum of 10% and a maximum of ~0%.
The percentage of the propylene glycol to acrylic po]ymer is .001 and .002. The Portland cement content of the composition is relatively high compared with the usual ~ortland cement mixes.
2~ It has been de-termined that the desired performance ;~2~.325~3 properties as hereinbefore set :forth ancl con-firmed by a labora-tory report hereinafter given, are controlled by the amount of propylene glycol modifying the acrylic polymer.
An alternate composition having -the same unusual and un-expec-ted characteristics as the foregoing example may comprise the substitution of Portland cement gray Type 1 -for the white Portland cement of the above example. The Portland cemen-t gray Type 1 is also commercially available from ,~ledusa Cement Company.
The prior art relating to cemen-t additives such as acrylic polymer, is illustrated by a publication copyr:ighted in 1980 by Rohm & Haas Company with respect to its RIIOPLEX (trademark) E-330, a cement mortar modifier. This publication states that cement mortars modified with the product are hard, tough, and durable and compared with unmodified mortars, polymer modified mortars have superior flexural, adhesive and impact strength as well as excellent abrasion resistance. Proper-ties of Portland cement rnortars to which the Rohm & Haas polymer were added are reported with respect to compressive strength utilizing the American Society for Testing and ~laterials Test Standards with a sample of the concrete after a 28 day dry cure showing a reading of 5,450 p.s.i. A sample of -the Portland cement coating composition of the present invention -tested in Pittsburgh Testing Laboratory utilizing the same test method of the 28 day air cured test samples showed an average reading of 5,~10 p.s.i.
which is substantially the same as the Rohm & Haas reported test.
On flexural strength, again using a 28 day air cured sample, 28 and the same Rohn & Haas test methods, the Rohm & Haas publica-1;G~ Ll1~513 tion repor-ts a reacling of 1,355 p.s.i., whereas the Pittsburgh Testi~g Laboratory Test average on 28 day samples of the gray composition of the present invention showed a reading of 1,~70 p.s.i. and 3700 p.s.i.
on the white cement composition after 7 days air cure; a sub-stantial improvement.
On shear bond adhesion, the Rohm & lIaas publication reports tests on a. 28 day air cured sample showing a reading of 500 PSI whereas the Pi-ttsburgh Tes-ting Laboratory report on -tests of the material of the present invention in -two samples 28 day 10 air cured, provided readings of 1,025 PSI and 1,087 PSI, respec-tively, showing the obvious superiority of the Portland cement composition of the present invention.
On abrasion resistance, the Rohm & Haas publication reported tests on 28 day air cured samples showing material loss of 1.70 grams, whereas the Pittsburgh Testing Laboratory reports on the Portland cement composition of the present invention showed a loss of only 1.1183 grams which is nearly half the material loss of the Rohm & IIaas test sample and shows the obvious superiority of the Portland cement coating composition 20 of the present invention.
Those skilled in the art will observe that a Portland cement coating composition having the unique and unexpected characteristics of the composition of the present invention makes possible the production of considerably improved precast Portland cement wall, floor and roof panels for use in building constructions which are :relatively thin with respect to their overall area and thickness and are frequently used as exterior 28 surfacing materials directly exposed to temperature and weather _~_ l,"t~
changes.
The material of the present inven-tion in addition to -the highly desirable and unexpec-ted charac-teristics hereinbefore noted has an unusual fire resistance characteristic. Tests of the material subjected to a flame at 2300F. for fifteen minutes showed no visual damage whereas Portland cement compositions here-tofore known in the ar-t erup-t, crack, and show visual deterioration at considerably lower -tempera-tures.
Applications of the acrylic polymer Por-tland cemen-t coa-ting composition of the present invention are particularly useful in forming Portland cement based ornamental panels having pebble carrying surfaces as the unusual and unexpec-ted shear bond adhesion firmly locks the pebbles wllich may be various ornamental rounded stones to the panel formed of the composition. Building blocks, such as cement blocks and the like as known in the industry, are advantageously provided with a coating of -the present composition on one or more of their surfaces so that a wall formed of these units has -the unusual characteristics of the material.
Tests of the composition disclosed herein relating to the thin coating and patching of aged,worn, cracked and eroded cement sidewalks and pavements and extending for a period of more than 10 months and through a complete fall, winter and spring season show no damage to the coated areas, no spalling and no breaking away of the coating whereas comparable damaged concrete sidewalks patched with conventional Portland cement mixtures, some including acrylic polymers show substantially less shear bond adhesion with sp~lling, 2~ and breaking away of the coa-ting material in tests of the same --~.0--.5~
duration in the same location and subjected to the same weather and wear conditions.
The color codlng hereinbe-fore mentioned is advantageous in applying the Portland cement coating composition herein dis-closed, -for example utilizing a green food color additive to the propylene glycol aqueous solution causes the mixture to assume a blue color when too much water is added. When the proper amount of water is added to achieve a desirable coating consistency, the material takes on a dark green color changing to amber green as the coating sets and in several days changing again -to a light greenish brown which remains until the coating material is subjec-ted to a thorough wetting down as irom rain in a weather area, whereupon the iinal color is a light gray.
It will thus be seen that an unusual acrylic poly~er Por-tland cement coating composition has been disclosed, which due to its relatively high Portland cement content, high de-foamer conten-t and the presence of a critical amount o~
propylene glycol produces a Portland cement coating material with unusual and highly desirablè characteristics including excellent compressive strength, exceedingly high ~lexural strength, very high unexpected shear bond adhesion and retaining better than normal tensil strength and impact strength and possessing an unusually and unexpected high abrasion resistance. The material is relatively inexpensive to form, relatively easy -to mix and in the proper and desirable consistency, unusually cooperative in trowel applications or spraying applications due to :its extremely low slump and highly adhesive 28 characteristics.
.~ 3~5~;3 Changes in the amounts of acrylic po~ymer alld Portland cement may be made within certain limits provided the ratio of propylene glycol to acrylic polymer is maintained. For example, the aqueous dispersion of acrylic polymer may be used in amounts between about 5% to about 7% by weight of the total composition and the Portland cement may be used in amounts between about 23% to about 38~o by weigh-t of -the total composition.
g Having thus described my inven-tion what I claim is:
Claims (6)
1. An improved coating composition comprising:
(1) between about 5% and about 7% by weight of an aqeuous dispersion of an acrylic polymer, (2) between about 23% to about 38% by weight of a type 1 Portland cement, (3) 50% by weight sand, (4) about 0.015% by weight of an aqueous solution of propylene glycol, (5) approximately 0.2% by weight of a defoaming agent, and (6) the balance to 100% by water, the percentage by weight based on the total weight of the composition.
(1) between about 5% and about 7% by weight of an aqeuous dispersion of an acrylic polymer, (2) between about 23% to about 38% by weight of a type 1 Portland cement, (3) 50% by weight sand, (4) about 0.015% by weight of an aqueous solution of propylene glycol, (5) approximately 0.2% by weight of a defoaming agent, and (6) the balance to 100% by water, the percentage by weight based on the total weight of the composition.
2. The improved coating composition set forth in Claim 1 and wherein the acrylic polymer is one of a group of acrylic resins comprising a thermoplastic polymer of acrylic acid, methacrylic acid or acrylonitrile.
3. The improved coating composition set forth in Claim 1 and wherein the propylene glycol is one of a group comprising 1.2 propylene glycol, 1.2 dihydroxypropane, 1.2 propanediol, methylene glycol or methyl glycol.
4. The improved coating composition set forth in Claim 1 wherein said defoamer is dimethylpolysiloxane.
5. The improved coating composition set forth in Claim 1 wherein the Portland cement is 50% by weight of the total composition.
6. The improved coating composition set forth in Claim 1 and wherein the acrylic polymer is 6% by weight of the total composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000440157A CA1200258A (en) | 1983-11-01 | 1983-11-01 | Acrylic polymer portland cement coating composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000440157A CA1200258A (en) | 1983-11-01 | 1983-11-01 | Acrylic polymer portland cement coating composition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1200258A true CA1200258A (en) | 1986-02-04 |
Family
ID=4126418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000440157A Expired CA1200258A (en) | 1983-11-01 | 1983-11-01 | Acrylic polymer portland cement coating composition |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1200258A (en) |
-
1983
- 1983-11-01 CA CA000440157A patent/CA1200258A/en not_active Expired
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