In summer, when the car is exposed to the sun for a long time, many friends are worried: "Oh, my car paint won't burn out!" " "ouch!" Will my tires burn out? Whether the people sitting in the car will get sunburned may be our first consideration. Just like going out in a down jacket in summer, clothes will not burn out, and people will faint first because of heatstroke. Some things outside the car don't burn easily.
car paint
Let's start with the car paint that everyone is most worried about. We really don't have to worry too much about getting sunburned. It's exposed, right? Today's car paint, or a layer of varnish, is used to resist ultraviolet rays and prevent pebbles from bumping when driving.
It's a bit like a cell phone with a tempered film. Jiang Weibin of Central South University has a master's thesis "The Development of Automobile Varnish", which says that the service life of varnish layer generally exceeds the service life of automobile itself, exceeding 10 years.
Moreover, car companies should also evaluate the natural weather resistance of vehicles in special exposure sites, such as Florida exposure site in the United States, Okinawa exposure site in Japan, Hainan exposure site in China and so on. QC/T 484- 1999, are you early enough? "Car paint", if necessary. It must be exposed to the sun for 2 years in Hainan Island, or used for 4 years without foaming, pulverization, rust and cracking, before it is qualified and can be sold.
tyre
There are still many friends who will worry: after being exposed for so long, the tires are very hot, and the tire pressure does not expand with heat and contract with cold. Didn't you learn all this? The tire pressure is very high. If you accidentally deflate yourself today, will the tire puncture again? It's a little worrying. Yin Haishan of Qingdao University of Science and Technology has a doctoral thesis "Theoretical and Experimental Research on Tire Wear and Its Temperature Field", in which the tire temperature is measured during driving.
Vehicle speed 20km/h, tire temperature 50 to 60°c, vehicle speed 120km/h, and tire temperature? 90 rpm110 C. Don't knock the eggs, water can be boiled on the tires.
Something in the car will get sunburned, some interior.
There's something in the car. It's really possible to get sunburned. Wang Weijian of Automotive Engineering Research Institute of Guangzhou Automobile Group Co., Ltd. and others have a paper "Study on the Influence of Photothermal Aging on the Scratch Resistance of Modified Polypropylene for Vehicles" in the magazine of Environmental Technology. Interior: I did an experiment with most car interiors. At 1250kj/m? Irradiation,120 c aging 1000h, and then scrape the inside with a hard metal spherical knife tip and a force of 10N to detect the color difference.
You don't need to remember this. Anyway, the result is this: the interior decoration is not aging, and the color difference is1.23; The color difference after photoaging is1.69; After thermal aging, the color difference reached 2.87.
The man sitting in the car.
Moreover, after being exposed to the sun, the interior is not only resistant to bumps and scratches, but also has VOC, which is called "volatile organic compounds" in Chinese and "toxic" in local dialect. When we sit in the car, we are taking drugs indirectly. This sunbathing is equivalent to sunbathing us.
Zhang Li of Jilin University has a master's thesis on the detection technology of volatile organic compounds and aldehydes and ketones under natural exposure of automobiles. Internal: After exposure, it was found that the contents of volatile organic compounds such as benzene and aldehydes increased obviously, and the concentrations of toluene and ethylbenzene even increased by 10 times.
It is said that benzene and aldehyde are basically toxic, and these gases will do great harm to human body. Benzene contains neurotoxicity and genotoxicity, which easily makes people weak, tired and insomnia, and also affects the reproductive system. So after the car is exposed to the sun, I suggest not to sit directly in it. As soon as the air conditioner is turned on, it says, "It's so hot, let it cool down quickly." It is still useful to open the window, open the external circulation and change the air a little.
And this kind of situation not only appears in new cars, but also in cars that have been driven for 1 or 2 years. However, aldehydes will be stubborn, and propionaldehyde will slowly start to emit even after 6 months, and it did not emit at first.
Inferior car film
A friend said, "There may be sunburn in the car. I'll put a car film on it." This does have a certain effect, but it also depends on the quality of the car film. It was exposed in Guangxi Quality Supervision Herald that the so-called "original factory" car film of 4S shop is also fake.
The reporter found that the cost of 1m film provided by wholesale stores to 4S stores is about 10 yuan. And you can put any logo you want on the inferior film.
Today, Mercedes-Benz needs a trident star emblem, BMW needs blue sky and white clouds, and Lexus is not impossible. Just say that the pattern has been made. These inferior films were collected, and it was found that the thermal insulation rate could not even reach 10% of the genuine film, and the formaldehyde content was dozens of times that of the genuine film.