JPS6021787B2 - Automotive refinish painting pretreatment method - Google Patents

Description

[Detailed description of the invention] The present invention relates to a pretreatment method for automotive refinish painting.

Repair painting of automobile bodies usually involves preparing the area to be repaired and its surroundings by preparing the surface, polishing the old paint film, correcting distortions, degreasing, putting putty, polishing, primer surfacer painting, and polishing. Next, the area around the repaired area is pre-painted and a top coat is applied. The above-mentioned pre-painting treatment around the repaired area is to provide a foothold to improve the adhesion between the undamaged old paint film around the repaired area and the repair paint film. This is done to remove attached wax, oil, etc.

Conventionally, this pre-painting treatment has been carried out by polishing with a cream or liquid compound, and then removing the compound with a solvent. These compounds have a sufficient ability to polish old paint films without defects, but compounds that have penetrated into the recesses of roughened paint films or complex and narrow places such as recesses in automobile bodies etc. cannot be sufficiently removed with a solvent, and as a result, repellency and the like occur when a repair paint is applied, which impairs the appearance of the paint film, and the current situation is that it is necessary to start over from the above-mentioned base treatment again. In view of the above-mentioned current situation, the present invention proposes that an excellent repair paint film can be obtained by using an abrasive that has the same abrasive function as a compound and can be easily removed by washing with water. The purpose of this invention is to provide a unique pretreatment method for automotive refinish painting.

That is, in the present invention, after surface treatment of the automobile repair area and its surroundings, the area around the repair area is coated with 85-9% by weight of aluminum silicate mineral powder with a particle size of 10-200 grains and 5-10% by weight of a surfactant. % and various additives as necessary, polish with water-resistant and solvent-resistant nonwoven fabric in the presence of water, then wash with water, and after washing with water, blow pressurized air, or The present invention relates to a pre-treatment method for automotive refinishing, which comprises removing residual water by contacting with a solvent.

The abrasive used in the present invention is mainly composed of aluminum silicate mineral powder and a surfactant.

The above aluminum silicate mineral powder has a particle size of 10 to 200.
Something about the size of a mountain is appropriate. If the particle size is less than 10 peaks, it will not be able to perform its original function as an abrasive, and if it exceeds 200r, the scratches that occur when polishing the old paint film without defects around the repaired area will become too deep. In order to fill in the scratches or make them invisible, it becomes necessary to apply a considerably thick layer of repair paint, which results in the need to use more paint than necessary, which is not only economically undesirable but also Furthermore, sagging and the like are likely to occur, impairing the appearance of the coating film. The appropriate amount of the aluminum silicate mineral powder used is 85 to 9% by weight in the abrasive.

The above-mentioned surfactant is blended in order to give the polishing agent the function of a detergent for removing deposits such as wax and oil.

The surfactant is not particularly limited, but anionic surfactants such as higher alcohol sulfate ester salts, aliphatic amine or amide sulfates, aliphatic alcohol phosphate ester salts, alkylaryl sulfonates; aliphatic amine salts; , quaternary ammonium salts, alkylpyridinium salts, and other cationic surfactants; polyoxyethylene alkyl ethers, polyoxyethylene alkyl phenol ethers, polyoxyethylene alkyl esters, sorbitan alkyl esters, etc. Typical examples include nonionic surfactants; or amphoteric surfactants.

The appropriate amount of the surfactant to be used is 5 to 1% by weight in the polishing agent, and within this range sufficient effects as a detergent can be obtained.

In addition, other additives such as a penetrant, a fungicide, a desiccant, and the like can be added to the polishing agent as required.

In the present invention, after a surface treatment is performed on the repaired portion of an automobile and its surroundings by the usual means as described above, the area around the repaired portion is polished with a water-resistant and solvent-resistant nonwoven fabric using the abrasive as described above together with water.

In other words, by attaching an abrasive to a flexible non-woven fabric made from fibers such as rayon, acetate, nylon, or polyester, and polishing the undamaged old paint film around the repaired area while soaking it in water, the adhesion with the repair paint is removed. It provides a foothold to improve the properties of the paint, and at the same time removes wax and oil adhering to the old, undamaged paint film.

After polishing, the car body is washed with water to remove abrasives and the like adhering to the car body.

In addition, when using a compound as in the past, it was necessary to remove it with an organic solvent, creating a poor working environment.
In the present invention, since only water is required, work can be carried out in a favorable environment. After washing, any water remaining on the car body can be removed in a short time by blowing pressurized air, spraying a small amount of solvent, or wiping with a cloth impregnated with solvent.

As described above, by the automobile refinish painting pretreatment method of the present invention,
It can prevent repellency of the repair paint film caused by residual compound and can be easily pretreated in a good working environment.

The present invention will be explained below with reference to Examples.

EXAMPLE The damaged parts of the automobile body and the surrounding area were prepared by normal means, such as preparing the base, polishing the old paint film, correcting distortions, degreasing, putting putty, polishing, painting and polishing with primer surfacer, and preparing the base for painting. After that, polishing agent [particle size 20-150
80% by weight of aluminum silicate-based mineral powder, 8% by weight of surfactant, and the rest of the additives] was attached to a nonwoven polishing fabric [Scotchbrite (trade name, manufactured by Sumitomo 3M)], and water was added to this. Using this polishing tool, the area around the repaired area was polished with normal finger pressure.

After washing with water to remove remaining abrasive and the like, water was removed using a cloth impregnated with a mixed solvent of xylene/butyl acetate (50/50).

Claims (1)

[Claims] 1. After surface treatment of the automobile repair area and its surroundings, the area around the repair area is treated with 85-90% by weight of aluminum silicate mineral powder with a particle size of 10-200μ and 5-10% by weight of surfactant.
Using an abrasive agent consisting of various additives as needed, polish with a water-resistant and solvent-resistant nonwoven fabric in the presence of water, then wash with water, and after washing with water, spray pressurized air or use a solvent. 1. A pretreatment method for automotive refinishing, characterized by removing residual water by contacting with.