WO2019006670A1

WO2019006670A1 - Solvent-based paint remover, and method thereof for removing paint of workpiece

Info

Publication number: WO2019006670A1
Application number: PCT/CN2017/091737
Authority: WO
Inventors: 方招娣
Original assignee: 深圳市长宏泰科技有限公司
Priority date: 2017-07-04
Filing date: 2017-07-04
Publication date: 2019-01-10

Abstract

A solvent-based paint remover, and a method thereof for removing paint of a workpiece. The solvent-based paint remover comprises the following components in parts by weight: 60 parts to 100 parts of propanediol butyl ether, 10 parts to 30 parts of glacial acetic acid, 10 parts to 20 parts of benzyl alcohol, 5 parts to 20 parts of cresol and 1 part to 4 parts of sodium alkyl benzene sulfonate. The paint removal method comprises: preparing a solvent-based paint remover; pouring the paint remover into a paint removal tank; immersing a workpiece with paint into the solution in the tank, paint of a workpiece with a thicker paint film capable of being cut open first by using a knife and then the workpiece capable of being immersed in the paint removal tank; and after a coating on the surface of the workpiece bubbles or wrinkles, taking out the workpiece, and putting the workpiece into water for washing or rinsing, and the coating being separated from the surface of the workpiece. Highly-corrosive concentrated sulfuric acid is not contained in the solvent-based paint remover, which does not generate corrosion to a substrate; and by means of the osmotic expansion effect, the paint film is peeled off in a flake form, the paint removal speed is high and the service life is long.

Description

Description: A solvent-based paint stripper and its application and workpiece stripping method

[0001] The present invention relates to the field of surface treatment technology, and in particular to a solvent type paint stripper and its application and a workpiece stripping method.

Background technique

[0002] In order to improve the surface properties or appearance of a product, the surface treatment technology of the workpiece is usually applied. For example, the surface treatment of aluminum, iron and their alloys goes deep into all walks of life. Moreover, most of the work needs to be pretreated before surface treatment, for example, cleaning, decontamination and degreasing, and stripping is required for some specific workpieces. For example, for some poorly applied coatings, the coating needs to be recoated and the old coating needs to be removed before repainting.

[0003] Paint strippers usually use the penetration of solvent molecules to swell, soften, wrinkle and dissolve the crosslinked polymer material under the action of activators, cosolvents and other components, and peel off off the surface of the substrate. . Some paint strippers contain methylene chloride, phenol, toluene solvent and hydrofluoric acid. These paint strippers are highly toxic and highly corrosive to the substrate.

technical problem

In view of the above, a solvent-based paint remover which is safe and effective and which is less corrosive to a substrate, and an application thereof and a paint stripping method of the workpiece are provided.

Problem solution

Technical solution

[0005] A solvent-based paint stripper comprising the following components in parts by weight: 60-100 parts of propylene glycol butyl ether, 10-30 parts of glacial acetic acid, 10-20 parts of benzyl alcohol, 5-20 parts of a Phenol, 1-4 parts sodium alkylbenzene sulfonate.

[0006] A workpiece stripping method comprising the steps of: formulating a solvent-based paint stripper as described above; pouring a paint stripper into a paint strip; immersing the paint workpiece in the bath, the paint film is thicker The workpiece can be first smeared with a knife and then immersed in the paint strip. After the coating on the surface of the workpiece is foamed or wrinkled, it is taken out, and the workpiece is placed in clean water to rinse or rinse, and the coating is separated from the surface of the workpiece.

[0007] And, the solvent type paint stripper is used for surface coating or plastic layer removal of a metal workpiece. Advantageous effects of the invention

Beneficial effect

[0008] A solvent-based paint stripper comprising the following components in parts by weight: 60-100 parts of propylene glycol butyl ether, 10-30 parts of glacial acetic acid, 10-20 parts of benzyl alcohol, 5-20 parts of A Phenol, 1-4 parts sodium alkylbenzene sulfonate.

[0009] A workpiece stripping method, comprising the steps of: formulating a solvent-based paint remover as described above; pouring a paint stripper into a paint strip; immersing the paint workpiece in the bath, the paint film is thick The workpiece can be first smeared with a knife and then immersed in the paint strip. After the coating on the surface of the workpiece is foamed or wrinkled, it is taken out, and the workpiece is placed in clean water to rinse or rinse, and the coating is separated from the surface of the workpiece.

[0010] And, the solvent-based paint stripper is used for surface coating or plastic layer removal of a metal workpiece.

Embodiments of the invention

[0011] Hereinafter, the present invention will be described in detail in conjunction with specific embodiments.

[0012] This embodiment provides a solvent-based paint stripper comprising the following components in parts by weight: 60-1 00 parts of propylene glycol butyl ether, 10-30 parts of glacial acetic acid, 10-20 parts of benzyl alcohol, 5-20 parts of cresol, 1-4 parts of sodium alkylbenzene sulfonate.

[0013] Specifically, the parts by weight of the propylene glycol butyl ether are preferably from 70 to 90. The glacial acetic acid is preferably 15-25 parts by weight. The parts by weight of benzyl alcohol are preferably 12-18. The cresol is preferably 10-15 parts by weight. The sodium alkylbenzenesulfonate is preferably 2-3 parts by weight.

[0014] The stripping agent stripping mechanism of the embodiment is: using propylene glycol butyl ether as a solvent, and having a low molecular weight, it can quickly penetrate into the coating layer after the paint stripping, so that the paint film softens and swells, and falls off as soon as possible. The dissolving power is centered, so that the peeled coating is not melted in the paint stripper, which contributes to the service life of the paint stripper. Benzyl alcohol is used as a co-solvent to enhance the stripping effect. Glacial acetic acid and cresol act as activators to accelerate the separation of the coating from the substrate. Sodium alkylbenzene sulfonate acts as a retarder to form a film on the surface of the solution to close the surface. The solvent in the paint stripper is difficult to volatilize and improves the paint stripping effect.

[0015] The above solvent-based paint stripping agent is mainly used for surface coating or plastic layer removal of metal workpieces. The metal workpiece can be aluminum, iron, zinc alloy, etc. The coating can be various types of electrophoretic paint, baking varnish, etc., or can be spray-coated. For example, the aluminum stripping method includes the following steps: Pour the stripping liquid into the stripping tank, and then immerse the stripped workpiece in the product. The thicker film can be scratched to the metal substrate. Re-immersion In the liquid. After the coating on the surface of the workpiece is blistered or wrinkled, take it out, rinse or rinse the workpiece in clean water, and the coating will be clean and completely detached from the workpiece. Depending on the type of coating, thickness and condition of the workpiece, the impregnation time is 1-10 minutes.

[0016] The above solvent-based paint remover adopts the combination of the above-mentioned formula components, does not use strong corrosive concentrated sulfuric acid, has low corrosivity to the substrate, is safe and environmentally friendly, and the organic paint stripping agent used for the solvent type paint remover is highly efficient. The expansion and peeling type paint remover removes the paint film by osmotic expansion, and the paint stripping speed is fast and the service life is long.

[0017] The composition range, preparation method, and use effect of the above paint remover are exemplified by a plurality of examples.

Embodiment 1

[0019] Take the following ingredients: 60 parts of propylene glycol butyl ether, 10 parts of glacial acetic acid, 10 parts of benzyl alcohol, 5 parts of cresol

1 part of sodium alkylbenzene sulfonate, put them in a mixing container, stir well, mix well, and prepare a solvent-based paint remover for use.

[0020] The paint stripping method is as follows: the solvent-based paint stripper is added to the paint strip; the lacquered workpiece is immersed in the bath for 5 minutes, taken out, the surface of the workpiece is observed, the coating is foamed off, and the workpiece is placed. Rinse into clean water, the workpiece is clean and free of residue, no corrosion.

Embodiment 2

[0022] Take the following ingredients: 70 parts of propylene glycol butyl ether, 18 parts of glacial acetic acid, 13 parts of benzyl alcohol, 10 parts of cresol

2 parts of sodium alkylbenzene sulfonate, put them in a mixing container, stir well, mix well, and prepare a solvent-based paint remover for use.

[0023] The stripping method is as follows: the solvent-based paint stripper is added to the paint strip; the lacquered workpiece is immersed in the bath for 5 minutes, taken out, the surface of the workpiece is observed, the coating is foamed off, and the workpiece is placed Rinse into clean water, the workpiece is clean and free of residue, no corrosion.

[0024] Example 3

[0025] Take the following ingredients: 80 parts of propylene glycol butyl ether, 25 parts of glacial acetic acid, 16 parts of benzyl alcohol, 15 parts of cresol

3 parts of sodium alkylbenzene sulfonate, put them in a mixing container, stir well, mix well, and prepare a solvent-based paint remover for use.

[0026] The paint stripping method is as follows: adding the configured solvent type paint stripper to the paint strip; immersing the paint workpiece in the tank 5 minutes in the liquid, take out, observe the surface of the workpiece, the coating foaming off, the workpiece is washed in clean water, the workpiece is clean and free of residue, no corrosion.

Embodiment 4

[0028] Take the following ingredients: 100 parts of propylene glycol butyl ether, 30 parts of glacial acetic acid, 20 parts of benzyl alcohol, 20 parts of cresol, 4 parts of sodium decylbenzene sulfonate, put them in a mixing container, stir well After mixing evenly, it is formulated into a solvent-based paint remover for use.

[0029] The paint stripping method is as follows: the solvent-based paint stripper is added to the paint strip; the lacquered workpiece is immersed in the bath for 5 minutes, taken out, the surface of the workpiece is observed, the coating is foamed off, and the workpiece is placed. Rinse into clean water, the workpiece is clean and free of residue, no corrosion.

[0030] It should be noted that the present invention is not limited to the above embodiments, and other changes may be made by those skilled in the art according to the inventive spirit of the present invention, and the changes according to the inventive spirit of the present invention should be It is intended to be included within the scope of the invention as claimed.

Claims

Claim

[Claim 1] A solvent-based paint remover comprising the following components in parts by weight: 60-100 parts of propylene glycol butyl ether, 10-30 parts of glacial acetic acid, 10-20 parts of benzyl alcohol, 5-20 Part cresol, 1-4 parts sodium alkylbenzene sulfonate.

[Claim 2] The solvent-based paint remover according to claim 1, wherein the propylene glycol butyl ether is 70-90 parts by weight.

[Claim 3] The solvent-based paint remover according to claim 1.

The number of copies is 15-25.

[Claim 4] The solvent-based paint remover according to claim 1.

The number of copies is 12-18.

[Claim 5] The solvent-based paint remover according to claim 1.

The number is 10-15.

[Claim 6] The solvent-based paint remover according to claim 1.

The number is 10-15.

[Claim 7] A method for stripping a workpiece, comprising the steps of: formulating a solvent-based paint remover according to any one of claims 1-8; pouring a paint stripper into a paint strip; The workpiece is immersed in the bath, and the workpiece with a thick paint film can be first smeared with a knife and then immersed in the paint strip. After the coating on the surface of the workpiece is foamed or wrinkled, take it out, rinse or rinse the workpiece in clean water, and the coating will leave the surface of the workpiece.

[Claim 8] The solvent-based paint remover according to any one of claims 1 to 6 for use in surface coating or plastic layer removal of a metal workpiece.