WO2018156348A1 - Improved coatings for pelletized thermoplastic pavement marking compositions - Google Patents
Improved coatings for pelletized thermoplastic pavement marking compositions Download PDFInfo
- Publication number
- WO2018156348A1 WO2018156348A1 PCT/US2018/017041 US2018017041W WO2018156348A1 WO 2018156348 A1 WO2018156348 A1 WO 2018156348A1 US 2018017041 W US2018017041 W US 2018017041W WO 2018156348 A1 WO2018156348 A1 WO 2018156348A1
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- WO
- WIPO (PCT)
- Prior art keywords
- coating
- composition
- fluoropolymer
- thermoplastic
- silica
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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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
-
- 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/004—Reflecting paints; Signal paints
Definitions
- Road surface markings are used on paved roadways to provide guidance and information to drivers and pedestrians.
- Road surface markings can be formed using mechanical or non-mechanical devices.
- Mechanical road surface markers may be raised or recessed into the road surface, and can be either reflective or non-reflective. Examples of mechanical markers are Botts' dots and rumble strips.
- Non-mechanical markers may be formed by paint, thermoplastic, preformed polymer tape, epoxy and other methods.
- Thermoplastic markers are some of the most common types of road marking based on their balance between cost and performance longevity.
- Thermoplastic binder systems are generally based on one of three core chemistries: hydrocarbons, rosin esters, and maleic modified rosin esters (MMRE).
- Thermoplastic coatings are generally homogeneous dry mixes of binder resins, plasticizers, glass beads (or other optics), pigments, and fillers. These types of markers demonstrate increased durability, lasting 3 to 6 years, and retro-reflectivity.
- Thermoplastic pavement markings are used in a hot-melt application process for various types of traffic control indicia. They are normally comprised of alkyd or hydrocarbon based resin systems, although hybrid versions of the materials can be formulated to impart favorable properties of each individual system into one combined system. Typically,
- thermoplastic pavement marking materials are used on roadways in longitudinal lines as edge and center-lines either as a continuous line or a skipped/dashed line. They can also be used for transverse markings such as stop bars, chevrons, traffic taming markings, bike and pedestrian crossings, railroad crossings, or similar markings. Thermoplastic pavement markings are used on public and private highways, public and private properties, airports, and parking lots.
- Thermoplastic pavement are non-reactive coatings systems that are 100% solids materials composed of binder, pigment, glass beads, and inert fillers. Each state, and some cities and counties, govern the type and application of thermoplastic application by specifying the chemical composition and final film properties in terms of field performance over the lifecycle of the marking. Although most governmental agencies have their own internal and independent pavement marking specifications, thermoplastic pavement marking specifications are normally based on some variation of AASHTO M-249, which is a federal specification that sets minimum and basic requirements of the materials to be used.
- the binder is made up of a combination of rosin or petroleum based resins, plasticizing oils, elastomers, and viscosity and flow modifiers.
- the pigment for white materials is predominately Type II rutile titanium dioxide.
- the pigment for yellow materials is an organic based yellow pigment which can be a combination of yellow and red or orange pigments designed to withstand high temperatures and provide excellent UV resistance and weatherability. Glass beads are incorporated into the material so that as the material degrades under UV, water, and traffic exposure the glass beads will become exposed and serve as reflective elements for nighttime visibility while under illumination from vehicles' headlamps.
- An exemplary compositional range for each component is as follows: binder 18- 26%, pigment (Ti0 2 only) 10-12% for white, N/A for yellow, and beads 30-40%.
- thermoplastic mix is supplied in powdered form, which makes it difficult to load into the road marking machine. The technicians have to strictly follow safety regulations and use special equipment when preparing the marking mix.
- United States Patent No. 5,972,421 discloses a method for producing pelletized pavement marking mixtures in which each pellet is a homogeneous mixture of the desired thermoplastic composition.
- co-pending application Serial No. 14/329,482 filed on July 11, 2014 discloses a system of producing pelletized thermoplastic pavement marking material, which eliminates or significantly minimizes hazards associated with dust produced by powdered mixes. This application is directed to an apparatus and method of producing the thermoplastic pavement marking material in a pelletized form.
- Co-pending application Serial No. 14/339,023, filed on July 23, 2014 discloses a composition suitable for use as a road marking substance.
- This composition is formed by mixing a binder mixture with a filler mixture, heating the mixed ingredients while mixing into a homogenous molten mixture and then extruding the molten mixture. The extruded material is cooled, cut into individual pellets, coated with an anti-clumping coating and packaged for use in making a road marking substance in situ.
- the binder can be alkyd-based or hydrocarbon based.
- the binder includes rosin resins, wax and a plasticizer, and a hydrocarbon resin is added for the hydrocarbon-based binder.
- the filler contains titanium dioxide, a pigment (if necessary) and ground calcium carbonate.
- the pellet coating material can be a member selected from a group containing kaolin clay, calcium carbonate, calcined clay, micronized waxes and other antidumping materials or a combination of materials.
- a coating for pelletized thermoplastic road marking material in which at least one of waxes, silica compounds, and inorganic compounds is provided on the surface of the thermoplastic pellet.
- the pellet is formed by mixing a binder mixture with a filler mixture, heating the mixed ingredients while mixing into a homogenous molten mixture and then extruding the molten mixture.
- the extruded material is cooled, cut into individual pellets and then coated.
- the coating prevents clumping of the pellets and also imparts improved flowability and lower melting point properties.
- Preferred coatings include micronized polyethylene wax, silicates, silanes, silicones, siliconates, fluoropoymers, calcium carbonate and zeolite.
- Figure 1 is a photograph showing the results of a deformation test performed on a standard thermoplastic material and a thermoplastic material made in accordance with the present invention.
- a homogeneous dust-free product is produced that has substantially less dust than conventional dry-blend or powder mixes
- the pavement marking composition produced using pelletized materials is homogenized during manufacturing, thereby producing compositionally identical particles. Having particles that are identical allows for increased process control and monitoring. Theoretically, one particle can be tested for composition and physical properties due to the homogenous nature of the finished product. Smaller samples can be taken with greater certainty of testing accuracy.
- a coating is applied to the extruded and dried pellets in a pellet coating barrel or vessel which is mounted below a coating container which houses a pellet coating material.
- a weight loss load cell can be operationally connected to the coating container in order to regulate delivery of the pellet-coating material to the pellet coating vessel.
- the pellet coating process modifies the surface of the pellets so that they will remain free flowing after packaging and storage.
- the free flowing nature of the material is necessary for ease of use during application.
- the pelletized material is deposited into a smooth walled, rotating barrel with an angled axis inclined toward the pellet source. As the material falls into the rotating barrel, the coating agent is metered from the coating container into the barrel at a flow rate controlled by the control unit in the form of the weight loss cell.
- the pellets can be coated by suspending the pellet coating as solution in the water used to cool and transport the material.
- coated pellets have a lower melting point than powder mixtures and also exhibit improved flowability properties.
- Coatings for thermoplastic pellets can be prepared from organic compounds such as waxes, various silica based compounds like silanes, silicones, siliconates and fluoropolymers; or inorganic compounds such as calcium carbonate, silica, or zeolite.
- Waxes are a group of organic compounds containing long alky chains and not soluble in water. They are derived from animals, plants, petroleum, and synthetic sources.
- the coating for the pellets is an aliphatic hydrocarbon such as micronized polyethylene wax (Polyspherse W2S).
- the coating for the pellets is a silica compound selected from the group of functionalized silanes, such as amino or alkyl silanes; silicones, such as alkyl silicones; or siliconates, such as sodium methlysiliconate.
- the coating for the pellets is a fluoropolymer, such as Capstones brand (DuPont), which can be either cationic or anionic.
- the coating for the pellets is an inorganic compound such as silica, calcium carbonate, sodium silicate or a zeolite.
- Preferred silica compounds include nano silica solutions, silica emulsions, and sodium silicate. Small particle size zeolite powder is preferred.
- additional coating compounds examples include polyethylene wax (Polyspherse W2F), amino silane (DC Z-6011), silicone emulsion, siliconate (sodium methyl silconate DC-772), nano silica (Ludox AS-30), sodium silicate, and zeolite powder (PQ corporation CBV760).
- the presently preferred coatings improve the performance of the road marking.
- the coating When melted with the rest of the pellet prior to application on the roadway, the coating will enhance the ability of the marking to resist deformation under the pressure of vehicular traffic. This allows the roadway marking to remain true and not spread out or otherwise smear.
- the preferred polyethylene wax coating will also lower the melt temperature of the pellet, reducing the energy needs to melt the pellets and also allowing the marking application system to operate at a lower, safer temperature.
- the polyethylene wax coating also improves the flowability of the melted pellets, thereby allowing the road markings to be applied at a quicker rate.
- thermoplastic product was placed in a metal can and heated on a hot plate until it melted and became a viscous fluid. The can was then placed at a 45° angle and the contents were allowed to flow and captured in another container placed below. The weight of the material that flowed into the second can was determined and a flow rate was calculated for the thermoplastic product. Thermoplastic products having a higher flow rate were more easily able to flow out of the thermoplastic tank. TABLE 2
- thermoplastic materials are stored in a closed, metal tank for a period of time before lane striping. Depending on the ambient temperature, the inside temperature of the tank will be significantly higher than the ambient temperature. Under such conditions, the thermoplastic material is susceptible to clumping and becomes difficult to transfer to the container on the truck.
- the following experiment was carried out to determine the effect of temperature.
- the pelletized thermoplastic product with polyethylene wax was washed with hexane/toluene followed by acetone to remove all surface coatings.
- the pelletized thermoplastic material with calcium carbonate was washed with 0.5N hydrochloric acid followed by water then air dried.
- thermoplastic pellet sample 50 grams was placed in a glass beaker and placed in an oven at 150°F (65.6°C) and the product was observed for clumping. After heating for 45 minutes at 150°F, the samples without coating clumped heavily and formed a thick mass, but the pellets with coatings remained as pellets without sticking and were able to be poured out of the beaker. The same trend was also observed after heating for 2 hours at 150°F. The results of this experiment are presented in Table 3 below. TABLE 3
- thermoplastic pellets 50 grams were placed an 80 mL glass beaker and heated in an oven at 140°F (60°C), 160°F (71.1°C), and 180°F (82.2°C) for the specified time and the glass beaker was taken out and the contents were poured out and observed for any clumping.
- the results are summarized below in Table 4. All coating chemicals mentioned in Table 4 show better anti-clumping effect than PE wax up to 160° F.
- the PE Wax coating/PE Wax in the material formulation also imparts to the thermoplastic pellets the ability to resist deformation at low temperatures. This property is important for pelletized thermoplastic because if the pellets deform during storage, they will form a physical "bridge" that will prevent them from flowing readily during use.
- thermoplastic material 500 grams was melted in an oven at 400°F (204.4°C) for 4 hours.
- the can containing the molten material was removed from the oven and the contents were stirred for 5 seconds with a suitable long blade spatula.
- Approximately 50-200 grams of the molten material was poured onto a non-stick surface to form a thin, circular disc of molten material.
- the disc should be less than 1/2 inch thick having a diameter of 2- 3 inches.
- the disc was suspended over a 2 inch crevasse in an incubator oven at 115°F (46.1°C). After 48 hours, the samples were monitored for deformation.
- a coating can be formed using sodium silicate combined with amino silane or a silicone emulsion.
- nano silica can be combined with amino silane or a silicone emulsion to form a coating.
- An additional coating can be formed by combining sodium methyl siliconate with nano silica or sodium silicate.
- a coating can be formed by combining amino silane or sodium silicate or nano silica with glass dust having an average size between 5 and 70 microns.
- the pellets produced in accordance with the present invention have superior storage stability.
- the pellets or particles are in the same physical form that is placed on the highway as an exterior, UV and weather resistant coating. Therefore, the pellets can withstand exposure to moisture, heat, humidity for longer periods than the current products on the market.
- Conventional "dry blend” products are produced in a powder form that will absorb moisture and become a solid compressed block over a long storage time. Moisture content causes increased energy to vaporize the moisture and the increased energy and heat will also cause color and physical property degradation. When the material becomes compressed the melt time, energy consumed, and labor requirement is greatly increased. "Block” material can withstand moisture as well, but the boxes that it is packaged in can get wet and become a nuisance and efficiency killer for crews.
- thermoplastic is considered to have a one-year storage life when stored indoors, away from direct contact with water.
- the pellet materials produced according to this invention could see that longevity at least doubled.
- the pellets can be used in conventional melt vessels and application operations, as well as “tankless” application operations. In a “tankless” process, no material would be heated in melt vessels or kettles. The pellets or particles would be added manually, pneumatically, or by other automatic or semi-automatic conveyance to a system of pipes and extruders capable of heating the material "on demand" and without any preheating.
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- 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
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2018225296A AU2018225296A1 (en) | 2017-02-23 | 2018-02-06 | Improved coatings for pelletized thermoplastic pavement marking compositions |
JP2019546875A JP2020508386A (en) | 2017-02-23 | 2018-02-06 | Improved coating of pelletized thermoplastic pavement marking compositions |
EP18706355.7A EP3585842A1 (en) | 2017-02-23 | 2018-02-06 | Improved coatings for pelletized thermoplastic pavement marking compositions |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/440,475 | 2017-02-23 | ||
US15/440,475 US10308816B2 (en) | 2014-05-05 | 2017-02-23 | Coatings for pelletized thermoplastic pavement marking compositions |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2018156348A1 true WO2018156348A1 (en) | 2018-08-30 |
Family
ID=63253979
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2018/017041 WO2018156348A1 (en) | 2017-02-23 | 2018-02-06 | Improved coatings for pelletized thermoplastic pavement marking compositions |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3585842A1 (en) |
JP (1) | JP2020508386A (en) |
AU (1) | AU2018225296A1 (en) |
WO (1) | WO2018156348A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020068944A1 (en) * | 2018-09-25 | 2020-04-02 | Potters Industries, Llc | Thermoplastic pavement marking composition |
Citations (7)
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US3867178A (en) * | 1972-09-05 | 1975-02-18 | Potters Industries Inc | Method for coating discrete particles |
GB2164762A (en) * | 1984-09-21 | 1986-03-26 | Potters Industries Inc | Retroreflective particles and method of making the same |
US5665793A (en) * | 1994-06-09 | 1997-09-09 | Anders; Irving | Phosphorescent highway paint composition |
WO1997038835A1 (en) * | 1996-04-12 | 1997-10-23 | Stimsonite Corporation | Method for producing pelletized pavement marking mixtures |
US5972421A (en) | 1996-04-12 | 1999-10-26 | Stimsonite Corporation | Method for producing pelletized pavement marking mixtures |
WO2009150305A1 (en) * | 2008-06-13 | 2009-12-17 | Oy Finncabin Ltd | Method and apparatus for mixing and feeding solid matter and binder |
WO2014166693A1 (en) * | 2013-04-08 | 2014-10-16 | Evonik Industries Ag | Novel road markings for assisting the perception of the surroundings of vehicles |
Family Cites Families (10)
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JP2000136248A (en) * | 1998-08-28 | 2000-05-16 | Toray Ind Inc | Thermoplastic elastomer pellet and production of molded product |
JP2000160058A (en) * | 1998-09-24 | 2000-06-13 | Hitachi Chemical Industrial Material Co Ltd | Meltable marking material |
US6482519B1 (en) * | 2000-12-29 | 2002-11-19 | Innovative Concepts Unlimited | Coated microparticles, plastic compositions and methods |
JP2002293946A (en) * | 2001-01-26 | 2002-10-09 | Kanegafuchi Chem Ind Co Ltd | Method for preventing stucking of isobutylene block copolymer pellet |
JP2005015597A (en) * | 2003-06-25 | 2005-01-20 | Nippon Zeon Co Ltd | Petroleum resin composition and hot-melt type road-marking coating material composition |
US7501019B2 (en) * | 2005-03-31 | 2009-03-10 | Chevron U.S.A., Inc. | Granular solid wax particles |
JP2008063496A (en) * | 2006-09-08 | 2008-03-21 | Toda Kogyo Corp | Colorant for road marking material and paint composition for road marking material produced by using colorant for road marking material |
JP5261958B2 (en) * | 2007-03-30 | 2013-08-14 | 住友化学株式会社 | Method for producing olefin polymer pellets |
US9771492B2 (en) * | 2014-05-05 | 2017-09-26 | Daniel John Puffer | Thermoplastic pavement marking composition and method |
JP2016188327A (en) * | 2015-03-30 | 2016-11-04 | 住友精化株式会社 | Self-adhesion preventive agent |
-
2018
- 2018-02-06 EP EP18706355.7A patent/EP3585842A1/en not_active Withdrawn
- 2018-02-06 AU AU2018225296A patent/AU2018225296A1/en not_active Abandoned
- 2018-02-06 WO PCT/US2018/017041 patent/WO2018156348A1/en unknown
- 2018-02-06 JP JP2019546875A patent/JP2020508386A/en active Pending
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3867178A (en) * | 1972-09-05 | 1975-02-18 | Potters Industries Inc | Method for coating discrete particles |
GB2164762A (en) * | 1984-09-21 | 1986-03-26 | Potters Industries Inc | Retroreflective particles and method of making the same |
US5665793A (en) * | 1994-06-09 | 1997-09-09 | Anders; Irving | Phosphorescent highway paint composition |
WO1997038835A1 (en) * | 1996-04-12 | 1997-10-23 | Stimsonite Corporation | Method for producing pelletized pavement marking mixtures |
US5972421A (en) | 1996-04-12 | 1999-10-26 | Stimsonite Corporation | Method for producing pelletized pavement marking mixtures |
WO2009150305A1 (en) * | 2008-06-13 | 2009-12-17 | Oy Finncabin Ltd | Method and apparatus for mixing and feeding solid matter and binder |
WO2014166693A1 (en) * | 2013-04-08 | 2014-10-16 | Evonik Industries Ag | Novel road markings for assisting the perception of the surroundings of vehicles |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020068944A1 (en) * | 2018-09-25 | 2020-04-02 | Potters Industries, Llc | Thermoplastic pavement marking composition |
US11702804B2 (en) | 2018-09-25 | 2023-07-18 | Ennis-Flint, Inc. | Thermoplastic pavement marking composition |
Also Published As
Publication number | Publication date |
---|---|
EP3585842A1 (en) | 2020-01-01 |
JP2020508386A (en) | 2020-03-19 |
AU2018225296A1 (en) | 2019-09-19 |
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