Analysis and Maintenance of Damage Causes of Car Top Paint[汽车维修知识]

(1) Flushing: Vehicles that have driven in the rain or on muddy roads should be washed with clean water as much as possible before the muddy water on the paint surface dries.If you use a high-pressure cleaner, the water pressure cannot be more than 5MPa, otherwise it will cause impact damage to the paint wax. If the vehicle is too dirty, you can choose a special non-ionic surfactant made ofcarCleaning fluid.Can't use washing powder and soap to make carsdetergent, Because this kind of washing products may cause the lacquer wax to lose gloss, aggravate the aging of the sealing rubber strip, accelerate the peeling of the partial paint film and the rust and perforation of some metals.
(2) Wipe: When the washed vehicle needs to be wiped clean, or needs to be cleaned and wiped at the same time, a clean cotton cloth, towel or soft material should be selected. The method of wiping the car is extremely important. When wiping the car, you should not press down on the surface of the car too much. You should not wipe the waxed surface repeatedly or rotatingly. Wipe longitudinally from the front or rear of the car to the end. The advantage of this wiping method is that since the longitudinal thick lines of the car body itself are more pronounced, if there are occasional fine scratches, the track is straight. The illusion caused by the poor vision of the human eye will make people have only a good impression of the overall appearance of the car. Assuming that when you can pull away those fine rotating scratches, the simple mathematical concept of "the shortest straight line distance between two points" has a deeper understanding.
(3) Brightening and cleaning: Brightening refers to the application of brightening emulsion, using products such as luminous emulsion to increase the smoothness of the surface of the lacquer wax to enhance the decorative effect. Such products are mainly divided into: polyethylene emulsion, silicone and other polymer materials. Since this type of material does not contain unsaturated fatty acids, it is easy to quickly generate polymer wax on the surface of the paint, which can cure the wax, play a cleaning role, and have the functions of preventing ultraviolet radiation, acid, alkali, and corrosion. Dirt such as gum, bird droppings, etc. dropped on the paint surface of the car, which can also be easily removed.
4.Repair method of partial scratches on topcoat
(1) Lacquer pen repair method. Use a paint pen of similar color to apply to the scratched area. This method is relatively simple, the process is not complicated, and the firmness is poor. It may be washed off after several rinses. It is only used for short-term appearance maintenance first aid.
(2) Spray paint method. Use traditional methods to repair deep scratches, remove rust, and apply fillers. After drying, sand with water and sandpaper. Repeat for several times until smoothing and touch up paint. The damage to the original car is large, the repair time is long, there is a certain color difference, and the effect is not satisfactory.
(3) The computer is used to adjust the paint and the repair area is small. After the special solvent treatment, the new and old paint surfaces are integrated, the adhesion is firm, and it can be repaired immediately. As long as the repair technology is correct, the paint repair effect is good.
Car surface paint is divided into two types, ordinary paint and metal paint, which are composed of phosphoric acid anticorrosive layer, electrophoretic primer, intermediate filler, ordinary top paint or special metal primer, etc. The ownership of modern mid-to-high-end cars has grown rapidly, and a large number of cars have entered the family. In order to keep the appearance of new cars as new and reduce damage such as aging, loss of gloss and corrosion, it is very important to explore the reasons for damage and maintenance of car topcoats. important.
1. Analysis of lacquer wax damage, aging and loss of gloss
(1) Natural factors, the blow of sand and dust; the impact of muddy water in the rainy season; the splash of asphalt from the asphalt road; gum, insect droppings, bird droppings and oil; various industrial emissions in the atmosphere, acids and alkalis, and sunlight Ultraviolet rays, etc.
(2) Human factors, improper selection of wax supplies or improper operation methods for new car driving; water gun pressure> 7Mpa when washing the vehicle, and incorrect cleaning procedures or methods; daily use of dry cloth to wipe the vehicle and selected polishing wax and other car paint care products Poor quality, etc.
2. The first maintenance technology of the new car topcoat
At present, in China, when a new car is purchased, a lot of dust is accumulated on the surface of the vehicle or it is scrubbed and removed by the sales unit in advance. Most people use only a bucket of water and a piece of cotton yarn to remove dust under poor site conditions. At this moment, it is the first time that human factors have damaged the painted surface. In the production of modern cars, most of them use electrostatic spraying technology. The painted surface of the finished car is mirror glossy when it leaves the factory, and the lens is clear, without any small scratches. If you want to maintain the original quality of the surface paint of the car when it leaves the factory, you should use a high-pressure washer, water The pressure is ≤5Mpa to wash away the dust. Then carefully check the car paint surface for scratches, sagging, paint pits, rust spots, color difference and corrosion under the paint surface.
If you are buying an imported car, you may encounter the problem of "waxing". When imported cars are sold abroad, a protective layer is sprayed on the surface of the paint to prevent them from being corroded by seawater during transportation across the ocean and spraying protective paint wax. This layer of sealing wax mainly contains paraffin, resin and Teflon and other materials, which can protect the car paint for nearly a year. There are many ways to remove this sealing wax. Using the correct method to remove the car top coat and the sealing wax is called "opening wax." Because many new car users use improper methods and techniques for "opening wax", some use sponge or cotton yarn to dip gasoline or kerosene to remove wax. Although the sponge is very soft, it is rarely thought that if it is mixed with iron filings, sand or other hard fine particles, it will be difficult to find, which will cause damage to the paint film during car washing and "waxing". The wax-opening liquid currently available on the market is a hydrolyzed wax-opening liquid, which advocates semi-automatic "wax-opening" work. This is consistent with our main point of view on car paint protection. The specific operation methods are as follows:
(1) Prepare wax solution, high-pressure cleaner (pressure≤5MPa), rubber gloves, rubber shoes, goggles, choose a cool and windless area, away from trees and vegetation, and no need to pre-wash the vehicle.
(2) Mix the wax-opening liquid according to the proportion indicated in the instruction manual, and install it in manual or electricsprayerIn standby.
(3) Spray the vehicle surface sequentially from the bottom of the vehicle from bottom to top, ensuring that each part is covered by the solution, keep it moist for 2 to 3 minutes, and then spray it with a high-pressure water gun, paying attention to no residual liquid in the gap.
(4) Check whether there is any remaining unwashed wax traces. If there is, repeat the above operation on the remaining parts.
(5) After the surface of the car is coated with wax to remove, you can choose to use a brightening emulsion containing polymer materials, or one that does not contain abrasives.Car waxDo cleaning treatment to maintain the inherent luster of the paint film.
3. Routine maintenance technology of car topcoat
Under conditions, cars should be stored inVIP CarIn the library. It should be parked in a cool and windy place at ordinary times, and long-term exposure to the sun should be avoided, because the ultraviolet rays in the sun are an important factor that causes the lacquer wax to age, crack, and lose gloss. If the above conditions are not met, more scientific nursing methods can also make up for the losses caused by insufficient conditions. On the finish of the front engine compartment cover of many cars, in the light or sunlight, it is easy to see countless fine scratches that extend outward with the light source as the center. Some "zero" kilometers of cars. For example, new cars that have not yet been sold in exhibition venues, it is not difficult to see this phenomenon. The roof paint rarely has such fine scratches. This is not a natural factor, it is entirely caused by a human factor. The front engine compartment cover is the most easily noticeable part of people’s vision. Therefore, most drivers and passengers will spend more time and energy on the engine compartment cover when washing the car and applying wax. The greater the damage to the paint film, the more serious it is, so it should be rinsed and wiped correctly.

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