汽车油漆补灰技巧(Automobilepaintrepairingtechnique)

汽车油漆补灰技巧(Automobile paint repairing technique )
1, prevent the edge of atomic ash low dent skills
One of the methods: spray with special back cover paint (or two primer), play a barrier role, pr event solvent infiltration coati ng, etc. after drying, with fine sand grinding primer, so that the surface of the coating workpiece smooth.
Methods: two……in spray paint, nitro first scraping putty in
putty edge, or use in special scraping trachoma quick drying putty such as drying, water sand grinding smooth, the barrier function.
Three methods: If time does not allow, according to the above approach, you need to directly spray paint. At this point, the specific method of operation is: electronic table in the vicinity of the coating, part of the spraying of atomic ash
.... In addition, if the event has a low phenomenon, as long as can solve this phenomenon according to the way of dealing with people, as follows:
....(1) in the film after drying, with special fine sandpaper gasket flat rubber pad to the concave sand flat (Note: be sure to use the flat rubber pad, also must be sanded smooth). When we see a light to see with the naked eye side had no obvious part of sand, to mmrk, and then use the fast drying volatile diluent to spray at a moderate degree of wetness, if need to spray the two, should be sufficient time interval.
(2)in atomic ash obviously concave scraping - Nitro putty (Note: only
a thin coating or use sealer or two primer), dry with fine sand is
smooth, spray paint. Then in order to truly ensure the coating is
smooth, no indentation marks. If you need to spray metal paint, you
must wait until the metal paint is dry and then cover it with a two-
component varnish.
.2, reasons mnd treatment skills of film cracking
…(丄)the reason why the film is cracked
(.1) the car used for too long, the film aging and natural cracking.
(.2) the builder pur sues the paint gloss one by one, blindly increasing the thickness of the pmint, spraying repeatedly, and each time interval is too short and not sufficiently dried.
(.3) wet primer, wet finish, or topcoat, poorly compatible with primer.
…(2) prevention and cure of film cracking
(.1) if it is cracked because of the aging of the paint film, and the film appears soft, it should be completely removed.
(.2) strictly control the thickness of pmint film and not spray too thick.
(.3) master the properties of various paints and choose the best quality brand.
(.4) in accordance with the construction requirements, each layer should be fully dried and then sprayed second layers, pay attention to the compatibility of topcoat mnd primer.
…(3) of the film. The film: severe cracking cracking, but
also with the shovel shovel moving film, can use "conservative therapy".
When the paint is dry, beat it with sandpaper to the light free state, and then scrape a thin layer of putty on the cracked paint film to make the bottom again. (Note: if the surface of the pmint film is cracked, the water shovel can not
be used under this condition.
…a film on the loose. The shovel shovel falls, only to complete the paint sand mill to the metal surface, re coating.
The color matching techniques for.3 and automotive patches
The color matching is based on the "spectral color" standard card・ The color should be matched from the color card, and the standard coating sample can be matched by the user. The specific steps are as follows:
....(1) to distinguish the color palette, first by color, accurate in standard light conditions to identify the "hue" and "lightness" and "purity", and defined the main color, color and other color will be used and adjust the "hue" and "lightness" and "purity11 of color pigment.
....(2) choose the right color, color coating with ammonium is required to tip type, varieties and diluent and auxiliary material matched principle, selection of excellent performance and economical color pigment preparation with Qidai.
(3)first, after a small sample, a Imrge number of adjustments, in the absence of color matching equipment conditions, but also should first tune the sample, to obtain the accuracy of pigment ratio, for a large number of modulation, to lay the foundation for waste reduction.
(4)the modulation steps mnd measures should be in strict accordance with the principle of "first master, second time, and crude sequence". Whenm ixing, they should be fully stirred mnd dissolved even Iy.
(5)auxiliary materials should be added in accordanee with the strict proportion to adapt to the variety, when the deployment of timely and appropriate amount of added intermodulation.
In particular, it should be noted that the pmint is wet mnd the sample color is solid, so the color of the paint tone should be slightly shallower than the sample structure, not too close and not too deep. Should be slightly shallower than the primary color, so that after the dry paint will be the same plate color, otherwise it will be too deep.
The reasons and treatment skills of putty impression on.4
Fill with the putty (putty) in the two-component paint, and after spraying the finish coat, sometimes the putty print appears. The main reasons are as follows:・・.(1) using atomic ash; inferior quality.
…(2) use inferior, two component primers.
(3) the ratio of atomic ash to curing agent is not correct.
…(4) the two component paint does not dry completely and fills the ash・
In order to avoid the putty print due to the above reasons, we should pay attention to the following points in advance:
(1)must use high quality putty (putty), can avoid putty printing and light
defects.
…(2) use high quality, two component medium coat primer and coat primer with proper number of layers (3 layers).
(3) the formula that should be provided by a licensed manufacturing plant.
Pay attention to the proportion of putty (putty) mnd curing agent, and precisely prepare・
……(4) a new two-component film spray for filling, heating must be dry before filling putty.
If the lacquer surface has putty print, the following measures can be taken:
(1)can be polished with P1500 sand paper, and then repaired with wax process・
…(2) when it is serious, paint again after sanding.
The phenomenon of…And the treatment measures・ 5, paint
The main reasons for... The micropyle:
(1)the surface of the paint is contaminmted with waxes, silicides, grease, or lubricating oils.
(2)no oil and water separator is added to the compression pump, and there is water and oil pollution in the trachea.
....(3) underlying the old paint solvent bubble defect effect produced when spraying paint, micropyle.
In order to avoid the phenomen on of••…advance should pay
attention to the following points:
(1)before spraying, use the degreasing agent to clean the surface of the workpiece, and remove the dirt, grease or lubricating oil, etc., so as to keep the surface clean・
…(2) use 1 water soluble detergents and spray the workpiece on 4 tap water cleaning solutions・
(3)if the old paint is found to have solvent foam defects, it should be filled with two components of primer, and the paint can be painted on top.
.... If the paint appears the micropyle, can take the following measures:
(1) after the paint film is completely dried, the affected film is sanded with
P8000 sand paper and sprayed again;
....(2) if the micropyle is serious, until completely dry film, completely polished after filling the hole with the micropyle, ash filled, polished re sprayed two primer mnd topcoat.
.6, film processing skills for producing orange peel wrinkles
The cause of wrinkles in orange peel:
…(丄)use bad solvents.
…(2) use improper nozzles (too large) mnd air pressure (Tai Di).
(3) the viscosity of chalk is too high.
…(4) spraying too thick or spraying gun incorrect.
…(5) unsuitable spraying process・
If film, orange peel wrinkles can be taken:
(1)after the paint film is dry, use P1500 sand paper to polish it and then recover it with wax process.
…(2) when conditions are serious, re spray after grinding.
Notes on.7 and the use of two-component paint Two component low temperature baking finish (2K) uses a small mmount of reactive isocyanate curing agent, which cmn infect the respiratory system and cause potential harm.
……In use, if the bank will strictly abide by the following suggestions that would not hinder the health・
(1) two comp on ent paint can only be used in a well ventilated spray booth, preferably in a qualified spray shop with high efficiency exhaust equipment.
(2)continuous use of a two-component paint containing isocyanate requires the use of an air supply mask and requires the use of non polluted air as a source of gas for the mask.
…(3) in a very short period of time (less than 15min), a mask (usually dust mask) that can meet the standard requirements for the protection of isocyanates shall not be used to protect against the chemical damage caused by cyanuric acid.
(4) people who have any respiratory diseases (such as asthma) must not use or contact a two-component paint containing isocyanmte・
…(5) regular physical examination.
The treatment of.8 mnd double component paint resulting in poor drying
In order to meet the requirements of different temperature differences (cold hot), two component paints mre designed with different driers and diluents.丨mproper use will result in bad drying and solve nt bubbles. Therefore, it is necessary to comply with the recommended dilution ratio of the pmint manufacturer and use suitable driers and thinners.
If the drying is bad and solvent bubbles mre removed, the following remedies can be used:
(1) if the solvent bubble is slight, you can try IC164 number wax to draw the surface of the film, then polish it with IC19 wax water to give the original luster.
....(2) if it is re sprayed by P800 wet grinding sandpaper fight thoroughly, such as the discovery of small blisters, spraying 2K thick primer filled, spray pmint after heavy sanding.
…(3) if the situation is serious, remove old paint and reprocess.
....9, treatment measures to re spray paint and two-component paint wrinkling phenomenon of heavy spray paint and double component paint, wrinkling phenomenoni s mainly because of the lack of new paint spraying safe and dry, can not stand the strong erosion of the solvent, resulting in softening and expansion.
Therefore, we must pay attention to:
(1)avoid using different kinds of paint or solvent to spray on the surface of new film・
(2)if new paint film must be sprayed again, it should be given a certain drying time, or heat baked, so that the pmint film is completely dry.
remedies for wrinkling: ...(1) if the condition is not very serious, after the paint
film is completely dry, grind the wrinkled area with sandpaper and then spray the halfway primer and finish coat.
...(2) shovel the bare metal surface if it is critical.
10, new paint surface appears scratches mnd sandpaper mark treatment
The main reason for the scratch and sanding marks on the new spray paint surface is that:
(1)new spray paint scratches appear to be the bottom layer of used coarse sand paper or 2K halfway primer.
(2)the old paint appears on the scratch .It will cause scratches when the pmint is constantly wiped and cleaned, especially in the sun. These shortcomings are sometimes the hardness of the finish is not good, or wax
may be immature wax polishing, failed to effectively remove coarse wax marks.
The methods of prevention and remedy are:
(1)mfter spraying the priming paint, the paint must be painted so as to remedy the defects on the paint film (such as sand
mark).
(2)the defects after spraying must be polished and filled with putty to be sprayed again.
.11, double component paint (2K) after spraying wrinkles, film surface loss of light and other phenomena
Wrinkle and the loss of light on the paint surface are mainly due to:
…(1) use excessive amounts of moisture proof agent (white water).
…(2) in correct use of two-component paint (2K).
…(3) the drying time of the pmint film is not enough.
…(4) Imck of baking temperature and time.
Avoid:
(1)pay attention to the moistureproof agent (white water), the paint volume has been diluted, no more than 15%.
(2)the blending ratio of the two-component paint (2K) must be strictly in accordance with the formula formulated by the manufacturer.
(3)if new pmint film must be reworked, sufficient drying time must be given, or heating and forced drying cmn be applied
before construction.
... remedies:
(1) if it is a misuse of a chronic drier and thinner, it may be warmed, dried, waxed or sprayed.
(2) incorrect use of an appropriate amount of drying agent or
2K paint, or forgetting to use a drier, must be removed from the paint film and re treated.
The treatment of.12 and paint tears
Too thick, two component spray painted on a vertical or oblique surface, failed to adhere to the paint film surface, and down flowing, known as tears. The chief cause is..:
(1)excessive or inapproprimte use of catalysts and thinners.
(2)the air pressure is too low mnd the paint is too high or too low to make the atomization bad and produce tears.
Avoid:
It is recommended that proper driers and thinners be used to match different
temperatures.
…remedies:
(1)let the paint film be dried thoroughly, then use P1500 water sand paper to polish, and then polish with IC129 wax water.
(2)if the tears are serious, let the film completely dry, then wet thoroughly with P800 sandpaper and then spray again. 13, silver paint and varnish mouth repair method
The following are the following methods for repmiring and facing varnish of silver powder paint:
(1)use more than P800 wet and dry mbrasive paper to smooth out the halfway primer.
…(2) use P1200 water sanding paper to polish the primer around 8~14cm.
…(3) polish with coarse wax in the outer ring 25cm range of the sprayed primer.
(4)clean and blow dry, wipe with oil and dust cloth.
(5)spray two layers of silver powder, cover the halfway primer, and spray gun pressure at 2〜2.5Kg.
....(6) to reduce gun pressure 2.5〜2kg arc spraying technique, a layer of more than one layer of expanded gradually homogenized, in each layer of spray before the end not to put the gun trigger to avoid Yumnyang color edge.
(7) adding a volatile solvent with a volume fraction of 50% or directly applying a slower volatile solvent (commonly referred to as an in terfacial solvent). On the edge of the patch, thin layer of mist is sprayed, the air pressure is at 2.5~3Kg, and two layers are sprayed to dissolve the edge tissue ・
…(8) dry surface.
••…(9) spraying varnish, the range should be beyond the silver spray area, and within the ground areas gradually homogenization.
…(10) use a slower, volatile solvent to spray the patches in the patch.
(11) film drying, cooling, polishing wax.
The treatment of. 14 and tiny particles on the surface of the film
Generally, the appearance of tiny particles on the surface of the film is caused by:
••…(1) paint or paint room air without filtering or improper filtering.
(2)spray dust is accumulated on the surface of the spray booth.
(3)the dust in the gap mnd groove of the vehicle is not blown clean.
(4)compressed air is not filtered or improperly filtered.
...(5) the vehicle is not cleaned with wet cloth before painting.
...(6) the lid of the paint jar is not tight enough to allow dust to enter.
(7) dust, sludge and fiber on workers* clothes.
…(8) paint and thinners with rusted or soiled containers・
...(9) the air flow in the paint booth is high mnd disordered.
(10)improper filtration of the direct fire source, jet stream, and space heating device.
(11)use poor quality covering paper, such as newspaper.
... prevention:
(1) good arrangement and management.
…(2) the surface that holds up the ashes.
…(3) the vehicle must be thoroughly cleaned at each stage of the spraying process・
…remedies:
(1)mfter the film has completely dried, wet it with P1200 sand paper and shine again by polishing.
…(2) leveling when the particles are deep. (Note: if the dry film surface is relatively regular small granular, there may be color paint is not completely dissolved.)
.15, two component silver powder paint produces "mandarin duck" hue treatment measures
This phenomenon is mainly due to the precipitation of silver powder in the silver paint. Caused by the following reasons:
…(丄)used inferior solvents.
(2)the use of improper nozzles (too large) and pressure (Tai Di).
(3)excessive use of slow drying agents and thinners・
…(4) unsuitable spraying technique.
prevention:
(1) use the original diluent and spray in accordance with the correct construction requirements.
…(2) use the correct nozzle / air pressure and spray process.
…remedies: .. After the paint film is dry, rub and spray again.
.16, two component paint lost light, color treatment measures
The main reason for the loss of light and color of the double component paint is that:
…(丄)use inferior solvents.
…(2) use slow dry catalyst and diluent.
…(3) excessive use of diluents・
(4)excessive coating or viscosity (too thick).
(5)use self drying primer and then spray two coat finish.
... remedies:
(1)after drying the paint film, polish it with P1500 sand paper and then polish it with wax.
…(2). In serious cases, dry film, grinding heavy spray.
The treatment of.17, the surface of paint film, which sometimes presents milky haze
This phenomenon is due to the condensation of water vapor and trapping in the wet paint film. The mmin reason is that: (1) the weather is cold and damp when spraying paint.
(2)the thinner used is too fast or too poor in quality.
(3)the pressure of the compressed air is too great, and the spray gun is improperly adjusted.
(4)use compressed air to blow the paint film in an attempt to accelerate solvent evaporation.
……(5) painting room Chuantangfeng, or heating, air flow is not sufficient.
…prevention:
…(2) avoid pminting in rminy, cold and wet weather and dry the paint naturally・ Otherwise, fogging agents should be used.
…(2) use a proper grade of thinner.
…(3) reduce the pressure of the compressed air to reduce the cooling effect.
……(4) the appropriate indoor spray heating, ventilation, to avoid drafts.
…repair methods:
(1)when the paint film is slightly foggy, the film can be repaired by polishing.
(2) when the paint film is very foggy, the surface of the film can be ground down, and then sprayed with proper grade of
thinner or non fogging thinner.
……(3) if the above method does not work, the painting room temperature to 5 degrees Celsius, to avoid direct blow drafts, the defect parts polished flat, and then re spraying.
(4) it should be noted that when the paint layer appears fogging, it may indicate that there is a similar defect at the bottom of the primer. It is difficult to spot this defect because the pmint surface is matt・ But this defect cmn sometimes cause paint bubbles or reduce adhesion between the paint layers.
The treatment of chalk dust or powder on the surface of. 18 or old paint
The emergence of this phenomenoni s difficult to paint in some components of precipitation, the main reason is that:
(1)paint contains mismatched or unqualified material.
(2)the ageing of the resin in the paint.
…(3) the ageing of paint in pmint.
…prevention:
…(丄)using recommended materials.
(2) avoid UV (Qiang Yangguang) exposure of paint film, not to use strong detergent cleaning film.
... repair methods: (1) the film will be polished and polished to restore luster.
…(2) in severe cases, a coat of paint can be re painted.
25, smooth and smooth film surface, lack of luster treatment measures
In automobile paint care, sometimes the film looks smooth and smooth, but the surface of the film is rough under a microscope・ The main reason is that:
…(2) the paint has poor adhesion, or if the primer is not thoroughly cured, a topcoat is sprayed on it.
(2)the quality of the materials used in the paint is too poor or the model is not correct, or other additives are not used.
…(3) the coating dries too slowly because the temperature is too high or too low.
…(4) improper paint dispensing or spraying.
…(5) the surface quality of the substrate is too poor.
(6)solvent vapor or automobile exhaust invades the surface of the film.
(7)the surface of the film is contaminated with wax, grease, oil, soap, water, or water.
(8)use too strong deterge nt or detergent on the new sprayed paint, or finish the paint too soon, or use the polishing paste too thick.
…prevention:
(1) use a qualified primer, and wait until the primer coat is fully dried before applying a topcoat.
…(2) use only recommended model materials and qualified additives・
(3)to fully stir paint, to en sure that the painti ng envir on merit meets the requirements, in accordance with the correct method of spraying.
(4)make sure the film is dried in a wmrm, dry condition.
…(5) thoroughly clean the surface of the substrate.
(6)in the drying process, the paint film surface should have the appropriate air flow.
(7)before spraying the finish coat, wipe the primer coat with detergent and dry the detergent.
…(8) prohibit the use of strong detergents or detergents on new sprayed paint surfaces .It shall not be polished until the film is fully solidified. Polishing must use the correct specifications of polishing paste.
... repair methods:
(1) the surface is usually milled with coarse wax and then polished to restore normal shine.
(2)if the loss of light is serious and the method is still not satisfactory, the top coat should be polished and sprayed again.
The treatment of flake peeling off on.26 film surface
••…This phenomenon is due to finish layer and surface lose binding force, the formation of brittle coating. The reason is that:
(1)the surface of the lower Imyer is contaminated by wax, grease, silicone, oil, release agent, water, rust or soapy water.
(2)no metal surface treatment agent is used on the surface of the steel or aluminum substrate, or the metal treatment agent used is not of the correct
type.
…(3) insufficient adhesion on the basal surface・
(4)ah, when the paint is base, the surface temperature is too high or too low.
(5)the method of spraying primer is improper and the primer is not sufficiently dry.
……(6) the viscosity of paint is not suitable, the thinner
the wrong type or poor quality, compressed air pressure is too high.
...(7) the paint film is too thick.
…(8) there is internal stress between two adjacent layers
of pmint film.
... prevention:
(1)make sure that the base surface of the prepared spray is cmrefully cleaned and wipe off the surface with a clean cloth.
(2)the correct metal surface treatment agent must be used on the surface of the steel or aluminum substrate. After the base treatment, the 30min shall begin painting, in case the base surface is rusty.
(3)before spraying, the base surface shall be polished and all the debris shall be removed.
(4)during spraying and drying, make sure the surface is in the recommended temperature range・
(5)spray the primer with the correct iron process. Make sure that the primer is fully cured before continuing the paint.
……(6) recommended models with thinner, paint diluted to correct viscosity range. The pressure of the compressed air will be lowered as much as possible to ensure that the paint is sufficiently atomized.
…(7) each spraying coat should be thin and wet.
…(8) using the same paint manufacturer's matching products.
…repair methods:
Remove the flaking paint, clean the underside, and then pmint again.
.27, the film is half light fuzzy state and the surface of the film grinding marks and other phenomena
These phenomenaa re caused by the absorption of surface primers. The main reason is that:
(1)it is not good to paste the primer on the surface of the porous substrate.
…(2) improper spraying of primer.
(3)the surface treatment of the primer is improper and the method of grinding is improper.
(4)not fully primed with spray paint. The finish coat is not
enough in thickness.]・・.prevention:
…(丄)correctly handle the surface of the primer.
……(2) the primer layer thickness should be appropriate, according to the proportion of the recommended thinners, to fully stir before use.
(3)when the primer is completely hardened, then polish the surface, use the appropriate fineness of sandpaper, and polish the surface of the primer to be smooth and smooth.
(4)spray a coat of sufficient thickness. Each coat should be thin and wet.
... repair methods:
…(丄)after the film has been completely hardened, grind and polish.
(2)when the situation is serious, paint the part of the defect flat and then paint it again.
.28, filled with ash, atomic ash or glass fiber surface of the film, there are more small holes in the treatment of the phenomenon
The main reason for this phenomenoni s that the paint is sucked into the hole of the base:
(1) the surface of glass fiber reinforced plastics has air holes.
.(2) improper surface treatment or closure.
(3)atomic ash or filled eye is of poor quality.
(4)the method of constructing atomic ash or filling ash is not correct.
…prevention:
(1)before painting, raise the temperature of the base to vent the air in the pores of the material. To prevent deformation, the temperature of the base surface shall not exceed 80 degrees Celsius.
(2)fill in the pinholes on the base surface with atomic ash
or filler. Spray the primer locally and polish it smoothly. Then spray all the base surface with primer.
…(3) use only recommended materials・
(4) atomic ash, many times construction, each layer should be thin and uniform, should be fully hardened and then coated with a new layer or the final grinding treatment.
... repair methods: Grind the paint film to the primer coat, fill in the pinholes, partially spray the primer, polish, smooth, and then spray paint again.。