What are the reasons why the paint finish is not up to the requirements 50

Loosen the water too little, put a little more.

1.The reason why the milling surface finish is not enough.

Generally, the finish is most closely related to the machining feed rate, and the milling is not low. In addition, the higher finish is related to the fixed frequency of the machine tool, that is, the vibration of the machine tool, but the cutting force will not be too large when processing aluminum parts, and the high speed is required, so it is likely to be related to the runout of the spindle end face. Check the end jump parameters of the spindle of the machine tool, and you may be able to find a way.

Try a diamond mill.

2.How to improve the finish of the end face of the cast iron of the machining lathe.

Use a grooving knife, flat, the surface is very smooth, but if the knife is to be sharpened well, any knife can be, the speed is high, the finish is not enough, it may be that the graphite level is not enough.

If the metallographic is qualified in the tissue, the finish is easy to achieve.

3.How to mill aluminum milling to have a high finish.

Choose special blades or props for aluminum, control the margin of face milling around the right, increase the speed appropriately, and use special coolant for cooling. In the past, some people used saponification at night, that is, they used laundry detergent and high-speed slow knives.

1. The surface roughening treatment before coating is mainly to consider the adhesion of the anti-corrosion coating 2. The roughness is reached, but the surface cleanliness is not good, which affects the contact area between the coating and the base layer, increases the amount of coating, affects the adhesion of the coating, and ultimately affects the quality of the anti-corrosion coating.

3. The roughness and surface cleanliness are not up to the requirements, and the consequences can be imagined.

Roughness and surface cleanliness can be strictly grasped during the acceptance between processes, but the construction process can not be ignored, paint ratio, coating interval, coating climate and other factors will ultimately affect the quality and service life of the anti-corrosion coating.

Construction management is also crucial

Reasons why the paint is not shiny:

matte paint is used;

After the paint is done, a layer of overcoat is needed to enhance the brightness. The color and brightness of the paint can be changed by the painter using other materials.

Before the actual painting, you can add a brightener to the paint, and the sprayed paint will be very bright.

Not shiny Is there a varnish or varnish Is your paint a two-component or a one-component, and the one-component paint is to be varnished and varnish.

Some paints are matte, which may not be what you want.

It's not bright and not polished, and it's good to wax it.

1. Make the surface of the paint film rough after drying.

2. The construction environment is unclean, and there are dust and sand particles falling in the paint, or sundries are sticking to the brush tools such as oil brushes.

3. The base treatment is not up to standard, the grinding is not smooth, and the dust and sand particles are not cleaned.

Solution: 1. The prepared paint must be filtered through a filter cloth to remove debris before brushing.

2. After the paint oil is blended, it should be allowed to stand for 15-20 minutes, and then use it after the bubbles disperse.

3. It is not suitable for construction in windy weather or dusty places, and the paint that has just been brushed should be dust-proof.

4. The uneven treatment of the base layer should be filled with putty, and then sanded smooth with sandpaper, and then brushed with paint after wiping off the dust.

5. The surface of the coating film has been rough.

One. substrate reasons.

The roughness of the substrate is large, and the roughness of the substrate reacts to the surface of the paint;

The substrate is not well pretreated, the surface tension is different, and the paint forms stripes or irregular concave and convex after film formation;

The substrate is relatively loose and has a large amount of oil absorption, and only a small amount of resin and pigment filler is left on the surface of the liquid substances (solvents, additives, resins) in the paint, which is dull and rough.

Two. Paint causes.

The paint is a primer, and a rough surface is normal;

The paint is matte paint, and it is normal for the surface to be extremely delicate and rough;

The paint is qualitatively changed, flocculating and producing a rough surface;

The selection of diluent is unreasonable, resulting in flocculation and other drawbacks, resulting in roughness;

The two-component coating is gelatinized after the application period, and the viscosity is too large, resulting in roughness;

There is a problem with the paint matching, that is, the primer, middle coat, and topcoat have supporting problems, such as biting the bottom and other shortcomings.

Three. Construction tool reasons.

There is no power stirring tool, which leads to the soft and hard precipitation and delamination of the paint in storage, which cannot be completely stirred, and the paint is uneven and produces particles, and the surface is rough;

There are no filtration facilities for construction tools, and the impurities in the paint cannot be filtered out, forming particles and a rough surface;

The spray gun is poorly atomized, and the large paint spots are thrown on the surface, forming soft particles, and the surface is rough after curing;

Spraying tools and paint mixing tools are not cleaned thoroughly, and many of the paint left over from early construction are consolidated into organic particles, which cause rough surfaces after spraying.

Four. Construction method reasons.

When spraying, the distance between the guns is too far, resulting in false spraying, and the paint film formation is not continuous, resulting in roughness;

The spraying is too thin, and the film formation is not continuous, resulting in roughness.

Five. Construction environmental reasons.

The construction environment is not clean, and dust and dust fall off the paint surface to form a rough surface;

The temperature of the construction environment is too high, and the paint is dry before leveling, resulting in roughness and loss of light;

The construction environment is not well ventilated, and the paint mist in the air falls back, resulting in roughness;

If the oven is dry, the oven is not clean, and the particles settle and stick when the air is blown, resulting in roughness.

Summary: There are many reasons for the rough surface, and when the malaise occurs, the work should be stopped in time, and the people (builders), machines (tools), materials (materials), and environment (environment) should be investigated one by one, and the construction should be carried out after solving the problem.

Overspray(over spray): It means that only some paint mist particles reach the surface of the coated object, forming a paint surface like sandpaper.

Dry spray(dry spray): dry spray refers to the liquid paint has been semi-dry before reaching the surface of the coated object, but there is still a certain amount of humidity just to be able to adhere to the surface to form a film, and in serious cases, it is like sand particles adhering to the paint surface, which cannot form a continuous and effective paint film.

1) The spray gun is not set correctly, and a small fluid caliber is used with a high-flow air hole.

2) The distance is too far when painting.

2) The gun is arced or angled.

3) The construction temperature is too high.

4) The pressure of the paint pump is too high.

5) The diluent evaporates too quickly.

Mix and use the matching thinner according to the standard ratio of the paint.

Solvent volatilization-curing one-component paints are naturally dried at low temperatures and protected from scorching sun and high temperatures.

Epoxy paints generally need to be used in environments greater than 5 °C.

The presence of overspray on the surface should be removed. Only some paint mist particles on the surface of the object are dry and adherent, which can be swept away or shoveled. If these fogging particles are not removed, the next coat will form a discontinuous film, needle rust will occur if the primer is sprayed, and the adhesion between the coats will be poor if it is other coatings.

Dry spraying should also be removed, including paint mist, which will make adhesion worse if not removed, and if there is paint mist before spraying, it will make the topcoat look very rough after filming.

This may be caused by the rapid volatilization of the thinner and the lack of leveling of the paint, and there are impurities in the paint, and the fineness of the paint is not enough!!

It may be that your lacquer is not delicate enough.

1 Whether the putty layer is not hard (the wall putty of the paint should be harder waterproof putty or external strong putty) 2 It may be that the paint you chose is not right (the coating hardness is low).

3. It is recommended that you choose F901 porcelain enamel coating (high hardness, scrub resistance, acid and alkali liquid corrosion resistance).

Mainly first, the ambient temperature and humidity, second, the thickness of the coating film, the greater the thickness, the higher the hardness.

Paint cracking: linear, angular or amorphous cracks are formed on the paint film. Causes of paint cracking:

Top 10 tips for paint color matching. Brush too thick or not dry reapply at one time; The temperature is too low during construction; Types of wood paint, use of wood paint. The wall base is too loose or rough; The paint system is incorrect, and the primer is not matched with the topcoat.

Solutions to paint cracking: what is polyester paint and what are its drawbacks? Ensure that the paint film is not too thick at one time; Remove the affected paint film; How to choose paint?

Make sure the front coat is dry before reapplying; For interior wall substrates with high roughness, it is recommended to use products with good flexibility, such as Dulux 5-in-1 wall paint; If necessary, seal the wall base with a suitable primer; When the temperature of the wall substrate is lower than 5, the wall latex paint cannot be constructed; Correct selection of paint system; If you need to scrape, you should ensure that the putty is firm and strong after curing, such as not using water-based putty when constructing furniture paint.

There are two reasons why paint cracks:

1. The wood board inside the paint is deformed and cracked, resulting in cracking of the external paint;

Second, the putty is too thick or the paint itself is too thick, or the paint is not dry during construction, and the next layer is brushed, resulting in cracking.

Corresponding workarounds:

1. Use No. 0 iron sand to grind off the paint surface, and after a period of time, wait for the moisture content of the board and wood to be normal, brush the sealing primer to seal the wood, maintain the normal moisture content, and then re-brush the primer and topcoat.

2. Use paint remover to remove paint and sandpaper to polish off the cracked paint layer, and re-standardize the painting. It is recommended not to repair it partially, otherwise it will cause unsightly consequences.

The leveling of the paint is not good, there are too many powdery substances, the paint components contain talcum powder and resin, if the composition of talcum powder is too much, it is easy to cause paint cracking, it is recommended to change the paint brand. Another reason is that if the paint is sprayed too thickly, it will also be easy to peel off and crack, so spray less.

Polyurethane waterproof coating: Polyurethane waterproof coating has excellent comprehensive performance of the cured coating film, and can form a continuous, elastic, seamless and integral coating film waterproof layer on the base layer with complex shapes. Strong adhesion to various substrates, strong adaptability to substrate expansion, deformation, cracking, etc., known as "liquid rubber" in foreign countries, whether in terms of performance, quality, effect, or economy, etc., has been recognized as the best waterproof coating.

Scope of application: suitable for basement, toilet and bath, kitchen, pool, cold storage, floor and other waterproof projects. It is best to choose *** paint coating, reference:

Red apple paint.

You change the paint, it is very likely that the solid content of the curing agent is not enough, if you need help 138**1102 my 4345

First of all, the hardness must have something to do with the varnish. Most of them are the reason for the formula, especially in the summer, the fluctuation of the raw materials themselves is relatively large, the upper limit of the things used to be taken, now it may be the lower limit, although they are qualified, but they may not be able to be used, you can find the previous hardness is no problem with the sample, with the current process to spray down to see. Also, look at your baking temperature, which also has a big impact, and then the humidity of the spray room, and the environment in which the product is stored, etc.

Is the paint completely dry? Then confirm whether there is a problem with your paint blending and spraying techniques, if there is no problem with these operations, it means that there is a problem with the quality of your paint itself!

Quality issues.

There is also the possibility that the construction is unreasonable, which is relatively small.

Do you mean that the paint of the original car was sprayed yourself.

The paint is too rubbish! And the varnish on the surface is broken.