When using road marking paint with road marking machine at room temperature, the following precautions should be followed in order to ensure the quality and durability of the marking:
Stirring and filtering: room temperature marking paint should be fully stirred before use and filtered through 60-100 mesh filter to prevent clogging of the nozzle of the marking machine and ensure smooth spraying.
Construction temperature control: The ideal construction temperature is about 20°C, and the applicable temperature range is from 4°C to 40°C. Construction environments below 4°C should be avoided as much as possible to prevent poor curing of the paint.
Dilution precautions: When diluting the road marking paint at room temperature, do not add too much solvent, so as not to reduce the proportion of resin in the paint, which will lead to the problem of peeling off the marking line and premature wear.
Coating thickness: The standard coating thickness is 0.4 to 0.5 kg/m2 . Too thin a coating may result in insufficient adhesion of the marking, making it susceptible to peeling and abrasion.
Matching of road surface type: When working on concrete pavements, a coating designed for concrete pavements should be used to ensure good adhesion and durability.
Road surface cleaning and drying: Before construction, the road surface should be thoroughly cleaned to ensure that there is no oil and other pollutants. At the same time, the road surface must be kept dry, and the construction after rain needs to wait for the road surface to be completely dry.
In addition, with the development of road construction technology, thermoplastic marking has become an important part of new road construction. In the construction of hot melt marking, the selection and application of undercoating agent is crucial for the adhesion and durability of the marking.
For new asphalt pavement, its rich asphalt organic matter has good miscibility with the petroleum resin in the coating. Under the construction temperature of 180-220°C, the petroleum resin and the melted asphalt fuse with each other to form a seamless whole, thus enhancing the bond between the pavement and the marking.
However, the nature of cement pavement is very different from that of asphalt pavement. Cement pavements are hydrophilic and have less adhesion to petroleum resins. Therefore, when applying hot melt markings to concrete, a specialized undercoating agent must be used. Such undercoaters usually have excellent toughness and impact resistance, and are made of synthetic elastic rubber, which can effectively enhance the bonding force between the road surface and the marking, and improve the durability and impact resistance of the marking.
For the old asphalt pavement, due to the reduction of asphalt content on its surface and the prominence of stones, the nature is gradually close to that of cement pavement. Therefore, when constructing thermoplastic marking on old asphalt pavement, the use of cement pavement undercoating agent or special matching undercoating agent should also be considered to ensure the adhesion and durability of marking.
To summarize, whether it is room temperature marking paint or thermoplastic marking technology, the use of road marking paint needs to be based on the type of road surface, the construction environment and the characteristics of the paint to carry out a reasonable choice and operation, in order to ensure the quality and durability of the marking.