Quick-Drying And Weather-Resistant Hot Melt Coating For Traffic Safety TCVN8791-2011

Quick-Drying and Weather-Resistant Hot Melt Coating for Traffic Safety TCVN8791-2011​

Specifications and Performance Parameters of Hot melt Coatings

1. Physical Form
Hot - melt coatings are usually in solid granular or powder form. The particle size is generally uniform, for example, the diameter is around 1 - 6 mm, which helps in uniform heating and melting during the hot - melting process.

2. Color
They come in a wide variety of colors including white, yellow, red, blue, etc. These colors need to meet relevant standards. For example, for white and yellow hot - melt coatings used in road markings, their colors should be within the chromaticity coordinate range specified by the transportation industry to ensure sufficient visibility.

3. Density
The density is generally between 1.8 - 2.3 g/cm³. The density affects the calculation of the amount of coating used and the thickness of the coating layer after construction.

4. Softening Point and Melting Point
The softening point is usually between 100 - 180 °C, and the melting point is around 140 - 200 °C. This parameter determines the temperature range at which the coating changes from solid to liquid, which is crucial for the heating and melting process. During construction, the heating temperature must be within this range to ensure good fluidity of the coating for easy construction.

5. Flowability
The flowability after reaching the melting point is an important indicator of the quality of hot - melt coatings. Good flowability ensures that the coating spreads evenly on the construction surface. For example, measured by a flowability tester, the flowability is generally between 30 - 60 mm.

6. Drying Time
Hot - melt coatings have a short drying time after cooling and solidifying to form a coating layer. Under normal temperature, it usually only takes a few minutes for initial drying, and the complete curing time may be about 1 - 2 hours, depending on environmental factors such as temperature, humidity, and coating thickness.

7. Adhesion
It has good adhesion to different substrate materials (such as asphalt pavement, cement pavement, metal, etc.). Adhesion is measured by a pull - off test, and generally, the adhesion should be no less than 4 MPa to ensure that the coating does not peel off easily during use.

8. Abrasion Resistance
It has strong abrasion resistance and can withstand friction caused by vehicle driving, people walking, and goods handling. For example, in traffic road markings, after a certain number of simulated wheel friction tests (such as 10,000 times), the wear amount of the coating should be within a certain range to ensure the service life of the marking.

9. Weather Resistance
It can resist the influence of natural factors such as ultraviolet radiation, rainwater erosion, and temperature changes. After long - term (such as 1 - 2 years) outdoor exposure tests, the coating should not show obvious fading, cracking, or pulverization to ensure its long - term performance.

Applications Range of Hot Melt Coatings

Thermoplastic coatings are mainly used in road marking and industrial identification.

For road applications, they are widely used in urban roads, highways, and parking lots. For example, at the intersections of urban roads, hot - melt coatings can be used to clearly draw lane - dividing lines, crosswalks, etc., helping vehicles and pedestrians to pass in an orderly manner. On highways, lane lines and edge lines painted with hot - melt coatings can maintain good visibility under the abrasion caused by high - speed vehicles and various weather conditions, providing clear guidance for drivers.

In industrial sites, they are often used for zoning and identification of factory floors, warehouse floors, etc. For instance, on the floor of a warehouse, hot - melt coatings are used to divide storage areas for different goods or mark safety passages and equipment placement areas.