CN108787393A - Paint spraying method - Google Patents

Abstract

The invention relates to a paint spraying method, which comprises the following steps: (1) priming paint is coated; (2) coating a first layer of finish paint, drying the first layer of finish paint, and then spraying a second layer of finish paint; (3) coating transparent paint: spraying at least one layer of transparent paint on the surface of the second layer of finish paint; the method is characterized in that: the first layer finish paint is dried in a drying mode, the drying temperature is 140-160 ℃ so as to accelerate the volatilization of a solvent in the first layer finish paint, thereby avoiding the phenomenon of pocking marks, and meanwhile, the temperature of the dried workpiece also enables the second layer finish paint to be more easily attached, thereby avoiding the phenomena of whitening and paint flowing. In the paint spraying method, a drying method is adopted during drying of the first layer of finish paint, so that the volatilization of the solvent is accelerated, and the defects of pockmarks, whitening and paint flowing are successfully avoided.

Description

A kind of method of paint spraying

Technical field

The present invention relates to industrial technical fields, and in particular to a kind of method of paint spraying.

Background technology

Spray painting and the main path that plastic-spraying is current industrial surface decoration, spray painting is compared with plastic-spraying with levelling is good, can repair The advantages of benefit, flexibility are good, decorative abundant, hardness is high, efficient, easily against ground defect, thus obtained increasingly It is widely applied.Usually spray painting use method be：Pass through spray-applied primer, first of finishing coat, second finishing coat, transparent successively Paint, wherein what first of finishing coat took is surface drying, i.e., it is dry in the environment of 70 DEG C or so.

However, during spray painting the problem of painting environment, since environment is unholiness, many dusts be mingled with wherein, because And form point after spray painting can be caused, it is generally the case that since the defect of point causes spray painting qualification rate less than 10%, how to prevent Only occur in painting process point be this field directly facing a technical problem.Since point is really fine dust attachment Caused by, therefore to eliminate point and need to increase substantially painting environment cleannes, but this can make spray painting cost be enhanced several times.

In addition, the reason of causing the defect of the point not be it is unique, in addition to dirt, it is also possible to cross spray or The reasons such as the other reason of person, such as levelling is insufficient, drying temperature is excessively high, coating quality；The selection for spraying tool is also important, matter The flow that bad spray tool has been unable to control spray gun rifle mouth is measured, the problems such as to also result in point；In addition, the enamelled coating mistake of spraying Exclusion that is thick and being unfavorable for bubble, it is also possible to cause point.

It paints other than can have the defect of point, also white point problem, if overspray can also flow the defect of paint.

Invention content

It can prevent from occurring point and/or stream paint in painting process the object of the present invention is to provide one kind and/or white point lacks Sunken, easy to operate, at low cost method for paint spraying.

In order to solve the above technical problems, the present invention takes following technical scheme：A kind of method of paint spraying, including it is following Step：(1) it primes；(2) first layer finishing coat is applied, sprays second layer finishing coat again after first layer finishing coat is dried；(3) transparent painting： At least layer of transparent paint is sprayed on the surface of the second layer finishing coat；It is characterized in that：The first layer finishing coat is using drying Mode be dried, and the temperature of the drying be 140-160 degrees Celsius, to accelerate the solvent in the first layer finishing coat to wave Hair, so as to avoid point phenomenon, while the workpiece temperature by drying also makes the second layer finishing coat be more prone to adhere to, The phenomenon that avoid whitening and flow paint.

Method due to using drying in the drying of first layer finishing coat in the method for the paint spraying in the present invention, because This accelerates the volatilization of solvent, to the defect for successfully avoiding point, whitening and flowing paint.

Specific implementation mode

Technical scheme of the present invention is described in detail below.

The method of paint spraying in the present invention includes the following steps：

(1) it derusts：If workpiece surface has iron mold, manual removal is carried out with scraper, emery cloth and steel brush class tool, when necessary Chemicals (such as pickling, formula are sulfuric acid, peregal, hexamethylenetetramine, water) cleaning can be used, in addition, gas also can be used Dynamic draw point pistol for rust removal.Preferably, using best selection office moat type pipette tips when the rifle.

(2) paint if workpiece surface is had been friends in the past, carries out depainting：To determine it is all de- when operation according to the situation of piece surface Paint or local depainting.Preferably, the method that depainting uses sandblasting depainting, paint stripper depainting.After old paint film is removed totally, use Warm water cleans up piece surface.Be used in combination gasoline or kerosene to clean remaining paint stripper, so as not to influence the gloss of new lacquer painting, Dry and adhesive force.

(3) position that need not be sprayed block being protected with adhesive plaster, paper or lubricating grease etc..

(4) it primes.

(5) the defects of filling out Puttying to eliminate the pit of piece surface, stomata, pitted skin, scratch, makes its uniform ground.Such as When fruit piece surface recess too depth or excessive area, it can be touched at this with rubber hammer, it is made to be full of reinstatement.

(6) it polishes：Dry grinding or water mill can be used in polishing, no matter which kind of uses, and removes floating dust, incrustation scale after having polished and does Only, and surface is made to be completely dried for use.

(7) base coat is applied：Putty after polishing can not possibly all be smooth, it sometimes appear that many holes are big Small sand holes are formed in situ bubble if do not repaired, and influence the total quality and appearance of finishing coat.So at this moment must apply Second priming paint, it is therefore an objective to fill up pin hole sand holes, while be also to increase binding force for the finishing coat of later process.

(8) it paints：Through look into piece surface really without sand holes after can spray paint.Finishing coat first uses spray gun when spraying Thin one layer of spray, the second layer, third layer are sprayed after parching, cannot be acted with undue haste when desired light tone, spraying again, primary to spray It is thick to be easy to spray, causes uneven shade or water droplet phenomenon.

Preferably, first layer finishing coat is dried by the way of drying, it is preferable that the temperature of the drying is 150 DEG C or so, due to workpiece, such as wheel hub, the solvent in first layer finishing coat can be accelerated to volatilize by drying, so as to keep away Exempt from point phenomenon, while the wheel hub temperature by drying also makes second layer finishing coat be more prone to adhere to, avoids whitening and flowing paint Phenomenon.

(9) transparent painting：One layer or several layers of colored varnishes, i.e. varnish are sprayed on finishing coat surface, to improve surface quality.

(10) it polishes：For further smooth coating surface, it is allowed to bright beautiful.

Method due to using drying in the drying of first layer finishing coat in the method in the present invention, accelerates molten The volatilization of agent, to the defect for successfully avoiding point, whitening and flowing paint.

Claims (8)

1. a kind of method of paint spraying, includes the following steps：

(1) it primes；

(2) first layer finishing coat is applied, sprays second layer finishing coat again after first layer finishing coat is dried；

(3) transparent painting：At least layer of transparent paint is sprayed on the surface of the second layer finishing coat；

It is characterized in that：The first layer finishing coat is dried by the way of drying, and the temperature of the drying is 140-160 Degree Celsius, to accelerate the solvent in the first layer finishing coat to volatilize, so as to avoid point phenomenon, while by the work of drying Part temperature also makes the second layer finishing coat be more prone to adhere to, to avoid whitening and flow paint the phenomenon that.

2. according to the method described in claim 1, it is characterized in that：

Further include the steps that derusting before the step (1), the derusting is using chemicals cleaning or pneumatic draw point derusting Rifle derusts.

3. according to the method described in claim 2, it is characterized in that：The paint if workpiece surface is had been friends in the past, in the descaling step The step of depainting being additionally provided between the step (1).

4. according to the method described in claim 3, it is characterized in that：The step of depainting, is de- using sandblasting depainting or paint stripper The method of paint.

5. according to claim 1-4 any one of them methods, it is characterised in that：It is additionally provided with throwing after the step (3) The step of light.

6. according to claim 1-4 any one of them methods, it is characterised in that：The temperature of the drying is 150 degrees Celsius.

7. according to the method described in claim 6, it is characterized in that：Twice priming paint is applied in the step (1).

8. according to the method described in claim 7, it is characterized in that：The painting twice priming paint among the step (1) the step of Between be additionally provided with the step of filling out Puttying.