Factors influencing the road performance of self-luminous traffic signs(1)

Energy storage type self-luminous traffic safety signs in Zhejiang Province has entered the promotion stage, taking into account the self-luminous traffic signs products installed in the field environment, bearing the temperature, humidity, ultraviolet light, wind, salt fog and acid and alkali environmental conditions of the erosion, the impact of energy storage type self-luminous traffic safety signs road performance of many factors, including self-luminous material types, material aging, environmental corrosion, mechanical properties, water resistance and surface self-cleaning. 

Water resistance and surface self-cleaning conditions. In order to ensure that the accumulation type self-luminous traffic safety signs to promote the application of engineering quality, it is very necessary to the accumulation type self-luminous traffic safety signs road with the analysis of factors affecting performance.

Accumulative self-luminous material can actively absorb sunlight, car lights and other visible light after 5~10min, can continue to glow in the dark for more than 12h, and according to the actual needs, so that it emits different colors of light. Energy storage type self-luminous materials are mainly sulfide series of energy storage type self-luminous materials, aluminate system energy storage type self-luminous materials, silicate system energy storage type self-luminous materials.

Sulfide series of accumulative self-luminous materials mainly include: zinc sulfide, zinc cadmium sulfide, strontium sulfide, barium sulfide, calcium sulfide, etc., is the practical luminous material of electroluminescence, but there are great shortcomings, that is, in the ultraviolet radiation will gradually darken affect the luminous performance. 

Aluminate system accumulative self-luminous materials have high luminous efficiency and good chemical stability, and are praised as the second generation of accumulative self-luminous materials, which is an important milestone in the development of accumulative self-luminous materials. Silicate system accumulative self-luminous material is a new generation of accumulative self-luminous material, but its luminous performance has not yet reached the level of aluminate system self-luminous material, to improve the luminous performance of silicate system self-luminous material, the majority of scientific researchers still need to do a lot of work.

In the accumulation type self-luminous traffic safety signs, self-luminous material selection aluminate system accumulation type self-luminous material, in order to ensure the role of safety signs.

Luminous material aging

Temperature resistance aging

Accumulation type self-luminous traffic safety signs installed on the highway, long-term use to experience the heat and cold season, the temperature change is very large, the road temperature in summer can reach 70 ℃, winter can reach -30 ℃, thus causing the aging of luminous materials, accumulation type self-luminous traffic safety signs luminous brightness will be reduced. The impact of ambient temperature on the luminous coating is reflected in the following points.

(1) temperature changes will affect the speed of chemical reaction of coating materials, will accelerate the degradation of certain polymer molecules, resulting in a decline in luminous performance.

(2) temperature will affect the additives and miscellaneous substances such as substances in the luminescent coating material diffusion rate.

(3) temperature changes will cause thermal expansion and contraction of the coating material, causing the coating material to crack and other phenomena.

The temperature in the air environment generally changes alternately with different regions, seasons or day and night. Accumulation type self-luminous traffic safety sign surface coating exposed to the atmosphere, due to alternating changes in temperature, the material constantly thermal expansion and contraction, thus causing changes in the coating stress, making the coating and substrate adhesion is reduced, and even cracking and other destructive phenomena, so the temperature difference is one of the important factors affecting the accumulation type self-luminous traffic safety sign coating aging.