AU667210B2 - Composition for road marking - Google Patents
Composition for road marking Download PDFInfo
- Publication number
- AU667210B2 AU667210B2 AU33909/93A AU3390993A AU667210B2 AU 667210 B2 AU667210 B2 AU 667210B2 AU 33909/93 A AU33909/93 A AU 33909/93A AU 3390993 A AU3390993 A AU 3390993A AU 667210 B2 AU667210 B2 AU 667210B2
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- AU
- Australia
- Prior art keywords
- cement
- weight
- composition
- aggregate
- modifier
- 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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- Road Signs Or Road Markings (AREA)
- Paints Or Removers (AREA)
Description
L ~1 6672
AUSTRALIA
Patents Act 1990 COMPLETE SPECIFICATION For a Standard Patent
ORIGINAL
I'.
00 00 0 90 44 4. 0 TO BE COMPLETED BY APPLICANT Name of Applicant: William Harold BANTON Actual Inventor: William Harold BANTON Address for Service: WRAY ASSOCIATES, Primary Industry House, Terrace, Perth, Western Australia, 6000.
239 Adelaide Attorney code: WR Invention Title: "Composition for Road 1a-king" Details of Associated Provisional Application No: PL1094 The following statement is a full description of this invention, including the best method of performing it known to me:- 1 1 c 2 This invention relates to compositions for coatings, and has particular application as a composition for road marking, and specifically, road marking incorporating reflective material.
In the field of road marking, there are several known methods, possibly the most simple of which is painting of road markings such as white lines. These painted road markings, in some instances, incorporate no reflective material. Where reflective material is incorporated into the :'eint, it is usually in the form of small spherical glass beads having a size of around 20 mil (0.5mm). The size of glass bead that can be incorporated in a road marking is limited by the thickness of the road marking and the properties of the road marking in relation to adherence to the glass beads. In order to provide optimum reflet ion it is necessary to embed approximately 60% of a spherical glass bead. Due to the fact that the paint coating is thin S" it is possible only to utilise small glass beads.
to 0.
Thermoplastic applied coatings and two part epoxy resin coatings are thicker and may support larger spherical glass *beads, however, there are difficulties with the stability of these compositions, and their ability to retain the glass beads.
The glass beads are important to the road marking, as they provide visibility at night. The larger the glass bead that can be supported in the road marking, the better the retro-reflectivity of the road marking during darkness. In addition, a larger spherical glass bead has better retroreflectivity, not only in dry conditions during night time, but also in wet conditions, as the water tends to wash off the surface of the larger beads, whereas with the smaller beads, water tends to cling by way of surface tension forces to the surface thereof. Therefore in wet
I,
j ~~nn=WiL~71-- 3 conditions, the small spherical glass beads may offer no retro-reflectivity at all.
A further disadvantage of the road marking paint compositions, is that a fast drying time is required so that the road marking may be driven on almost immediately.
To achieve this, a solvent is required in the paint which will evaporate rapidly. Typical solvents used are xylenes, often iold under the trade mark "XYLOL", and isocyanates.
Typically, one litre of paint has three litres of solvent mixed therewith, and considering that 1 million litres of paint destined for road marking application are sold in the r* State of New South Wales alone, in Australia, each year, this represents a large volume of solvent evaporant which is dispersed into the atmosphere each year. There are also some doubts as to the environmental safety, and the safety to people who are exposed to these solvents in the course of applying the road markings.
The thermoplastic road markings, while being perhaps less hazardous, have other problems. As the thermoplastics are hard at normal ambient temperatures, it is necessary to heat the material and allow it to melt onto the road surface. Glass beads must be applied while the material is molten. A disadvantage of the thermoplastics is that expensive equipment is required in order to apply road markings to a road surface.
It is an object of the present invention to provide a composition which will be suitable for, inter alia, road markings or for providing a base for reflective road markings, and which will obviate some of the aforementioned disadvantages, or at least provide an alternative to presently available road marking compositions.
I -4- In accordance with one aspect of the present invention there is provided a surface coating composition suitable for forming inter-alia a coating for embedding reflective spheres for road marking, said composition comprising a first part including between and 60% by weight of a calcined siliceous cement and between 30% and 60% by weight of an aggregate having a particle size of less than 1000 microns, and optionally up to 10% by weight of a pigment; and a second part comprising between 70% and 99% by weight of a cement polymer modifier, and between 0.1% and by weight of a cement plasticiser; wherein said first part and said second part are intended to be mixed in proportions of between 1:0.05 and 1:0.2 with sufficient water to produce a workable blend.
°,L0 Preferably said first part includes between 0.5% and 10% by weight of a high alumina cement or a refractory S. cement.
Preferably said first part includes between 0.5% and 0. o' 2% by weight of said high alumina cement or said refractory cement.
B
Preferably said first part includes between 40% and by weight of said calcined siliceous cement.
9 0 Preferably said first part includes 48% 1% by weight of said calcined siliceous cement.
The calcined siliceous cement may be white portland cement.
Preferably said first part includes between 45% and by weight of said aggregate.
L'o Preferably said first part includes 50% 1% by weight of said aggregate.
Preferably said aggregate is a hard crystaline mineral.
Preferably said aggregate comprises one or more of: a hard crystaline mineral, a hard vitreous mineral, a garnet, a garnet alluvial in origin, preferably having traces of metamorphic or sedementary rock adhering in fractures or on faces thereon, or a mixture of garnet and glass spheres.
Preferably said aggregate has particle size of between 150 microns and 600 microns (0.15mm to 0.6mm) Preferably said second part comprises between 0.1% and by weight of a cement plasticiser.
Preferably said second part comprises between 96% and 98% by weight of said cement polymer modifier and 2% by weight of said plasticiser.
.0 Preferably said second part comprises up to 2% by weight of an antifoaming agent.
Preferably said cement polymer modifier comprises an acrylic polymer cement modifier and an acrylate/styrene copolymer cement modifier in .0proportion 5:5 to 8:2, with a proportion 7:3 being most preferred.
Pigments may be added to said first part for providing colour.
-1 -6- For example TiO 2 (titanium dioxide) may be added to said first part, to impart "whitenes" to the final composition. In this instance, Ti02 comprising 1% by weight of said first part is suitable.
In accordance with a second aspect of the present invention there is provided a surface coating composition suitable for forming inter alia a coating for embedding reflective spheres for road marking, said composition comprising:between 25% and 45% by weight of a calcined siliceous cement or a portland cement, between 25% and 50% by weight of an aggregate, between 3% and 15% by weight of a cement polymer modifier, and between 0.05% and 2% by weight of a cement plasticiser, and optionally including up to 9% by weight of a pigment, said composition being intended to be mixed with sufficient water to produce a workable blend.
Preferably said composition includes up to 10% by weight of a high aluminium value cement or a refractory cement.
So Preferably said composition includes between 0.5% and ;ri' 2% by weight of said high aluminium value cement or said refractory cement.
I °o Preferably said calcined siliceous cement is white portland cement.
Preferably said aggregate comprises one or more of: a hard crystaline mineral, a hard vitreous mineral, a garnet, F y\ rr -7a garnet alluvial in origin, preferably having traces of metamorphic or sedementary rock adhering in fractures or on faces thereon, or a mixture of garnet and glass spheres.
Preferably said aggregate has particle size of between 150 microns and 600 microns (0.15mm to 0.6mm) Preferably said cement polymer modifier is present in proportion of approximately 9% by weight, and said cement plasticiser is present in proportion of approximately 0.2% by weight.
Preferably said composition also includes up to 2% by weight of an antifoaming agent.
Preferably said cement polymer modifier comprises an acrylic polymer cement modifier and an acrylate/styrene copolymer cement modifier in proportion 5:5 to 8:2, with a proportion 7:3 being most preferred.
Preferably said cement polymer modifier comprises said acrylic polymer cement modifier and said acrylate/styrene copolymer cement modifier in o o proportion 7:3.
So o In accordance with a further aspect of the present invention there is provided a method of marking a road utilising a surface coating composition as hereinbefore defined, further including a step of directing a stream of glass beads at a freshly placed road marking at a velocity sufficient to partly embed said glass beads.
Preferably said stream of glass beads are entrained in a flow of hot air, said flow of hot air being provided t to transport said glass beads and accelerate the -8setting speed of said freshly placed road marking.
The raising of the temperature of the unset composition will accelerate the setting speed.
Preferably said stream of glass beads are entrained in said flow at a controlled rate. The control can be effected by way of a valve arrangement to restrict the number of beads which can be entrained in the hot air flow.
Preferably said stream of glass beads are entrained by virtue of the vacuum effect of a venturi arrangement.
This is achieved by the flow of hot air causing a vacuum in the glass bead delivery chamber which results in the glass beads flowing in air caused to move by the vacuum and then being picked up and entrained in< the flow of hot air.
The invention will be better understood by reference to the following description of one specific embodiment thereof, and the subsequent discussion of variations which may be made thereto, and the applications of the resultant compositions.
The composition comprises two parts, the first part being a dry blend, and the second part being a liquid mixture. The dry blend comprises:- 48% by weight of white portland cement; 1% by weight of titanium dioxide; 1% by weight of a refractory cement sold under the o I Pi I o 9 trade mark "SECAR 80"; and aggregate in the form of garnet having the size range 150 microns to 350 microns, or 35% aggregate in the form of garnet having the size range 250 microns to 600 microns and 15% aggregate comprising glass spheres having the size range 150 microns to 600 microns.
The garnet used is garnet mined in the Port Gregory Mine in the State of Western Australia in the Commonwealth of Australia.
The "SECAR 80" is manufactured and sold by the Lafarge Aluminous Cement Company Limited and comprises approximately 80% anhydrous aluminium oxide (A1 2 0 3 and 18% calcium oxide (CaO).
The ingredients comprising the dry blend are thoroughly mixed to ensure even dispersal throughout the mixture.
The liquid component comprises,by volume of an acrylic cement polymer modifier sold under the trade mark "RHOPLEX MC-1834", manufactured by the Rhom Haas Company; by volume of an acrylate/styrene copolymer cement modifier sold under the trade mark "ACRONAL 8 702", manufactured by BASF A.G.; 1% by volume of a foam control agent sold under the trade mark "BEVALOID 681F", manufactured by Rhone- Poulenc Chemicals in Australia, and sold under the trade mark "COLLOID" in the United States of America; 1% by volume of a non retarding mortar plasticiser sold under the trade mark "CLEAR CALAIR" by the company Cement Aid (WA) Pty Ltd; and 48% water.
10 Alternatively, a foam control agent known as "SE 47" mrnufactured by Hoechst A.G. may be used.
The dry blend and the liquid component are thoroughly mixed together prior to application which will result in the production of a white paste. For every kilogram of the dry blend approximately 0.23 litres of the liquid component is utilised.
For use as a road marker, the paste is applied to the road using a textured roller. If spherical glass beads are required to be applied to the paste, they are applied before the paste dries or sets, and are applied by being 0 *entrained in a hot air flow through a venturi. Hot air is supplied to the venturi at approximately 4 to 5 pounds per square inch at a high volume. Glass beads of size 0.85mm to 1.18mm are entrained in the hot air flow through the venturi, at a controlled rate, and sprayed onto the paste S' which has been applied to the road surface. They are sprayed at a velocity which is suitable for embedding them to the correct depth for maximum reflectivity. The hot air accelerates the setting speed of the composition.
1 The purpose of the titanium dioxide in the dry mix is to 414 make the composition whiter. If a yellow line is required, then a yellow pigment may be substituted for the titanium dioxide.
Referring to the liquid component, the "MC 1834" acrylic polymer is a solution of polymer in water comprising approximately 47% by weight of solid.
The "ACRONAL S 702" cement modifying polymer aqueous dispersion. having a solid content of 50% The "CLEAR CALAIR" plasticiser is a non-retarding type mortar
V
~i -i 1 I i 11 plasticiser normally used for providing "fattiness" in mortar used in brick laying.
The effect of the "ACRONAL S 702" cement modifying polymer is to accelerate the speed of setting of the composition.
The "ACRONAL S 702" may be replaced entirely or in part by "MC 1834" acrylic polymer, but the setting time of the composition will be increased. The "CLEAR CALAIR" plasticiser improves the workability of the composition when it is wet. The anti-foaming agent reduces air entrapment in the mix.
The resultant composition, when set, remains flexible, and exhibits good adherence even to metal surfaces. It is expected that the composition when used as a road marker will have a greater wear resistance than the paints which are presently used. The composition has good adhesion to the spherical glass beads, due to the fact that there is virtually no shrinkage of the composition, unlike normal t icement. In addition, the components of the composition have properties of low toxicity, which is an advantage from the point of handling safety.
It should be appreciated that the scope of the invention should not be limited to the scope of the embodiment described herein. For example, the composition is equally effective for use as a floor coating in high traffic areas in factories and like places.
M c
Claims (19)
1. A surface coating composition suitable for forming inter-alia a coating for embedding reflective spheres for road marking, said composition comprising a first part including between 30% and 60% by weight of a calcined siliceous cement and between 30% and by weight of an aggregate having a particle size of less than 1000 microns, and optionally up to 10% by weight of a pigment; and a seccnd part comprising between 70% and 99% by weight of a cement polymer modifier, and between 0.1% and 30% by weight of a cement plasticiser; wherein said first part and said second part are intended to be mixed in proportions of between 1:0.05 and 1:0.2 with sufficient water to produce a workable blend.
2. A composition as claimed in claim 1 wherein said first part includes between 0.5% and 10% by weight of a high alumina cement or a refractory cement.
3. A composition as claimed in claim 2 wherein said first part includes between 0.5% and 2% by weight of said high alumina cement or said refractory cement. o a
4. A composition as claimed in any one of the :preceding claims wherein said first part includes between 40% and 50% by weight of said calcined siliceous cement.
A composition as claimed in claim 4 wherein said S, first part includes 48% 1% by weight of said calcined siliceous cement.
6. A composition as claimed in any one of the preceding claims wherein said first part includes C between 45% and 55% by weight of said aggregate. I *j 1 1 -13-
7. A composition as claimed in claim 6 wherein said first part includes 50% 1% by weight of said aggregate.
8. A composition as claimed in any one of the preceding claims wherein said second part comprises between 0.1% and 2.5% by weight of a cement plasticiser.
9. A composition as claimed in any one of the preceding claims wherein said second part comprises between 96% and 98% by weight of said cement polymer modifier and 2% by weight of said plasticiser.
A composition as claimed in any one of the preceding claims wherein said second part comprises up to 2% by weight of an antifoaming agent.
11. A surface coating composition suitable for forming inter alia a coating for embedding reflective spheres for road marking, said composition comprising:- between 25% and 45% by weight of a calcined siliceous cement or a portland cement, between 25% and 50% by weight of an aggregate, :between 3% and 15% by weight of a cement polymer modifier, and 4* between 0.05% and 2% by weight of a cement plasticiser, and optionally including up to 9% by weight of a *r :pigment, said composition being intended to be mixed with sufficient water to produce a workable blend.
12. A surface coating composition as claimed in claim 11 including up to 10% by weight of a high aluminium value cement or a refractory cement. TO) DI -14-
13 A surface coating composition as claimed in claim 12 including between 0.5% and 2% by weight of said high aluminium value cement or said refractory cement.
14. A composition as claimed in any one of the preceding claims wherein said aggregate comprises one or more of: a hard crystaline mineral, a hard vitreous mineral, a garnet, or a garnet alluvial in origin, preferably having traces of metamorphic or sedementary rock adhering in fractures or on faces thereon, or a mixture of a garnet and glass spheres.
A composition as claimed in any one of the preceding claims wherein said aggregate has particle size of between 150 microns and 600 microns. (0.15mm to 0.6mm)
16. A composition as claimed in any one of claims 11 to 15 wherein said cement polymer modifier is pijent in proportion of approximately 9% by weight, and said cement plasticiser is present in proportion of approximately 0.2% by weight.
17. A composition as claimed in any one of the o preceding claims wherein said cement polymer modifier comprises an acrylic polymer cement modifier and an Sacrylate/styrene copolymer cement modifier in proportion 5:5 to 8:2.
18. A composition as claimed in claim 17 wherein said cement polymer modifier comprises an acrylic polymer cement modifier and an acrylate/styrene copolymer cement modifier in proportion of 7:3. Sa TO
19. A method of marking a road utilising a surface coating composition as claimed in any one of the preceding claims including a step of directing a stream of glass beads at a freshly placed road marking formed from said composition, at a velocity sufficient to partly embed said glass beads. A surface coating composition substantially as herein described with reference to the description of the embodiment. Dated this twelfth day of January 1996. WILLIAM HAROLD BANTON Applicant Wray Associates Perth, Western Australia Patent Attorneys for the Applicant a C CC *rrr a ABSTRACT A surface coating composition suitable for forming inter alia a coating for embedding reflective spheres for road marking comprising between 25% and 45% by weight of a calcined siliceous cement or a portland cement, between 25% and 50% of an aggregate, between 3% and 15% of a cement polymer modifier, and up to 2% of a cement plasticiser, and optionally including up to 9% by weight of a pigment and up to 10% by weight of a I high aluminium value cement or a refractory cement, said composition being intended to be mixed with sufficient water to produce a workable blend. Depending upon phase nature (ie liquid solution or solid) of the ingredients, the composition may be prepared in either one or two parts for storage prior to mixing with water. The aggregate may be vitriolic or crystaline with garnet or glass spheres or both being preferred. L I
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU33909/93A AU667210B2 (en) | 1992-02-26 | 1993-02-26 | Composition for road marking |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AUPL1094 | 1992-02-26 | ||
| AUPL109492 | 1992-02-26 | ||
| AU33909/93A AU667210B2 (en) | 1992-02-26 | 1993-02-26 | Composition for road marking |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU3390993A AU3390993A (en) | 1993-09-02 |
| AU667210B2 true AU667210B2 (en) | 1996-03-14 |
Family
ID=25622621
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU33909/93A Ceased AU667210B2 (en) | 1992-02-26 | 1993-02-26 | Composition for road marking |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU667210B2 (en) |
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| Publication number | Publication date |
|---|---|
| AU3390993A (en) | 1993-09-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PC | Assignment registered |
Owner name: COMET PTY LTD Free format text: FORMER OWNER WAS: WILLIAM HAROLD BANTON |