There will be some problems when the car is exposed to the sun all the time, such as the aging of car paint and the increase of toxic gas concentration in the car, but it is a bit exaggerated to say that the car is exposed to the sun.
Cars do have some problems after being exposed to the sun.
The sun is big, especially at noon, right? This kind of exposure will first accelerate the aging of car paint, and it is easy to fade and lose luster. Ultraviolet rays in sunlight can destroy the molecular structure of organic and inorganic substances, and any organic or inorganic raw materials and organic resins can only show color under stable molecular structure. Just like this cabinet on our balcony, it has been drying for a long time. Do you think the color will change? In the same way.
As for the car basked in the sun, it is cracked, so it won't be too bad. The national standard QC/T 484- 1999 "Automobile Paint" has made some requirements on the weather resistance of automobile paint: it must be exposed to the sun for 2 years or used for 4 years in Hainan Island without foaming, pulverization, rust and cracking. So we don't have to worry too much. 1999 will have a national standard, right? It must be more optimized now.
Influence on vehicle interior and sealing strip
In addition to the aging of car paint, exposure to the sun all the time will also accelerate the aging of car interiors and sealing strips. For example, the interior is mainly made of polymer materials, which are more vulnerable to sunlight. It is said above that light will destroy the molecular chain inside polymer materials, thus aging polymer materials. Over time, these phenomena will appear, such as yellow color, surface cracking, mechanical properties decline and so on. For example, in front of the dashboard of this classic car, we can easily see aging and cracking.
Exposure of new cars to the sun will release a lot of pollutants.
On the other hand, exposure is not only a car injury, but may also hurt people. Especially for new cars, the sun will release many pollutants. If there is no ventilation, people will sit directly in it, which may really affect their health. There is an experiment that says: Let the new cars go on the road separately, expose them to different temperatures for 2 hours, and then compare and test the pollutant concentration in the cars. As a result, when the temperature inside the car is 40℃, the concentration of pollutants is 0.59 to 4.72 times that of 10℃.
This is like: at noon in summer, the smell of garbage dumps will be a little bigger, and the reason is the same. As we said in the video before, under the conditions of outdoor temperature of 34.3℃ and humidity of 52.6%, after 1 hour exposure, the average temperature of the air inside the car is 44℃, and the temperature inside the car is actually higher than the temperature.
That is to say, if it is a new car, it will be exposed to the sun 1 hour at high temperature in summer, and the concentration of pollutants in the car is already out of the chart, and it will be several times higher.
Exposure to the sun will lead to a flat tire.
Number 1: car exposure can lead to a flat tire. In fact, due to the exposure, the tire temperature does rise, which does have a certain impact on the aging of the tire, but it is a bit exaggerated to say that the tire is directly punctured. For example, the doctor said that eating too much sugar is not good, and the result was spread: as long as you eat sugar, you can get diabetes, which is the problem. Just exposure, the tire temperature is actually not as high as it was when it was opened, so don't worry too much.
Zhou Zhongwei and Wei Li of Delta Tire Co., Ltd. published a paper "Analysis of Influencing Factors of Temperature Change of Radial Truck Tire". The above experiment: the tire runs at 130km/h for 2 hours, which is a high speed, right? The internal temperature of the tire is as high as 97.6℃. Southeast Business Daily has also done an experiment: after the car is exposed to the sun for 2 hours, the tire temperature is 55.2℃, which is far lower than the working temperature of the tire at high speed. So, it's all within this range. Don't believe that it is hotter in the sun than driving at high speed. I won't.
Exposure to the sun will lead to spontaneous combustion.
Another friend said: "The car will spontaneously ignite if it is exposed to the sun. You see, when we were young, we took pictures with a magnifying glass. Can't it light all the matches? " Right? Single high temperature condition will not lead to auto-ignition. If spontaneous combustion occurs, there may be something wrong with the car itself.
According to the papers published in China Industrial Safety (Academic Edition) and Statistics and Analysis of Motor Vehicle Fires, spontaneous combustion fires are mainly caused by motor vehicle electrical system failures, fuel system failures, exhaust system failures and mechanical failures.
Compared with parking there, there is actually a greater possibility of a fire when the car is driving. Wang Jian's master's thesis "Investigation and Prevention of Automobile Fire" is shared with you. What does it say above: in car fire accidents, most of them occur while driving, accounting for about 70%.
Because the car is running, there is a greater possibility of short circuit, oil leakage and tire friction. Anyway, there is no mention of exposure, and it is not directly related to exposure.
How to avoid the negative impact of exposure?
Finally, for exposure, we can still take some measures to reduce the negative impact. First of all, in view of the problem of rising temperature in the car, we can alleviate it by sticking a good and reliable solar film or putting an umbrella. My family sells it.
Long Enshen of Chongqing University and others published the paper "Study on Temperature Variation Characteristics of Air-conditioned Car in Outdoor Parking Lot in Summer". As mentioned above, under the same external conditions, the temperature rise of the car with solar film after parking is 10 minute, which is lower than that of the car without solar film by more than 10℃.
For example, the problem of pollutants in the car can be alleviated by ventilation, such as opening the window a little after parking, or opening the door before getting on the bus to let it ventilate before entering. In view of the problem of spontaneous combustion, you can check the circuit, engine and fuel pipeline of the vehicle before the arrival of summer. All you have to do is run to the 4S shop and say to him, "I want to check the anti-aging and anti-spontaneous combustion." He must know how to do it. Just ask the service consultant.
Give the car a "physical examination" to avoid the danger caused by high temperature.
Generally speaking, exposure does have a certain impact on the car. Before the arrival of summer, it is also necessary to do a car "physical examination" to avoid the risk of car injury and personal injury caused by high temperature. In addition, sticking a reliable solar film on the car or putting an umbrella in the sun can also have a good effect.