WO2018000236A1

WO2018000236A1 - Solvent-based paint remover, use thereof and method for removing paint from workpiece

Info

Publication number: WO2018000236A1
Application number: PCT/CN2016/087648
Authority: WO
Inventors: 万华
Original assignee: 深圳市盈恒科技有限公司
Priority date: 2016-06-29
Filing date: 2016-06-29
Publication date: 2018-01-04

Abstract

Disclosed is a solvent-based paint remover comprising the following components in parts by weight: 60-100 parts of benzyl alcohol, 5-10 parts of hydrofluoric acid, 20-60 parts of triethanolamine, 30-100 parts of water and 5-10 parts of nonylphenol polyoxyethylene ether. Disclosed is a method for removing paint from a workpiece, comprising placing a workpiece with paint into a paint removing tank, and after the paint layer on the surface of the workpiece is blistered or wrinkled, placing the workpiece in clean water for washing or rinsing, wherein for a workpiece having a thicker paint film, the paint film can be cut open using a small knife prior to being immersed in the paint removing tank. The paint remover can be used for the removing treatment of a paint layer from the surface of a metal workpiece.

Description

Title: Solvent-based paint stripper and its application and workpiece stripping method

Technical field

[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 painted paint layers, the paint layer needs to be repainted, and the old paint layer needs to be removed before repainting.

[0003] A paint stripper generally utilizes the permeation force of a solvent molecule to cause the crosslinked polymer material to swell, soften, wrinkle, and dissolve under the action of an activator and other components, and is peeled off from the surface of the substrate. Some paint strippers contain pure solvents such as methylene chloride and phenol. These paint strippers have a large odor and are more toxic and dangerous. 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 60-100 parts of benzyl alcohol, 5-1 0 parts of hydrofluoric acid, 20-60 parts of triethanolamine, 30-100 parts of water according to the following parts by weight , 5-10 parts of nonylphenol ethoxylate.

[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 stripping tank. After the lacquer layer on the surface of the workpiece is blistered or wrinkled, it is taken out, and the workpiece is placed in clean water to rinse or rinse, and the lacquer layer is separated from the surface of the workpiece.

[0007] And, the solvent type paint stripper is used for removing the surface paint layer of the metal workpiece.

Advantageous effects of the invention Beneficial effect

[0008] The solvent-based paint remover is a combination of the above-mentioned formula components, does not use corrosive concentrated sulfuric acid and the like, has low corrosivity to the substrate, is safe and environmentally friendly, and the organic paint stripping agent used for the solvent-based paint remover It is a high-efficiency expansion peeling type paint remover. It peels off the paint film by osmotic expansion, and the paint stripping speed is fast and the service life is long.

Invention embodiment

Embodiments of the invention

The present invention will be described in detail below with reference to specific embodiments.

[0010] This embodiment provides a solvent-based paint stripper comprising the following components in parts by weight: 60-1 00 parts of benzyl alcohol, 5-10 parts of hydrofluoric acid, 20-60 parts of triethanolamine, 30-100 parts water, 5- 10 parts nonylphenol ethoxylate. Specifically, the parts by weight of benzyl alcohol are preferably from 70 to 100. The parts by weight of hydrofluoric acid are preferably 6-9. The triethanolamine is preferably 30-50 parts by weight. The parts by weight of water are preferably from 30 to 60. The nonylphenol ethoxylate is preferably 6-9 parts by weight. The stripping agent stripping mechanism of the present embodiment is: triethanolamine and benzyl alcohol dissolving lacquer layer, hydrofluoric acid accelerating lacquer layer metal substrate separation, water for diluting concentration and reducing gas volatilization, nonylphenol ethoxylate To clean, disperse.

[0011] The above solvent-based paint remover is mainly used for the removal of the surface paint layer of a metal workpiece. The metal workpiece can be aluminum

, iron parts, zinc alloy, etc., the paint layer can be all kinds of electrophoretic paint, baking paint and so on. 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. Then immerse in the working fluid. After the coating on the surface of the workpiece is foamed or wrinkled, take it out, rinse it in the clear water or rinse it, and the coating will be completely and completely removed from the workpiece. The immersion time is 1-10 minutes depending on the type of paint layer, thickness and condition of the workpiece.

[0012] The above solvent-based paint remover uses a combination of the above-mentioned formula components, does not use corrosive concentrated sulfuric acid, methylene chloride, and the like, has low corrosivity to the substrate, is safe and environmentally friendly, and the above solvent-based paint remover The organic stripping agent used is a high-efficiency expansion stripping paint stripper, which peels off the paint film by osmotic expansion, and has high peeling speed and long service life.

[0013] The composition range, preparation method, and use effect of the above paint remover are exemplified by a plurality of examples.

[0014] Embodiment 1 [0015] Take the following amounts of ingredients: 60 parts of benzyl alcohol, 5 parts of hydrofluoric acid, 20 parts of triethanolamine, 30 parts of water, 5 parts of nonylphenol ethoxylate, placed in a mixing vessel, fully stirred After mixing evenly, it is formulated into a solvent-based paint remover for use.

[0016] 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 paint layer is foamed off, and the workpiece is placed. Rinse into clean water, the workpiece is clean and non-corrosive.

[0017] Example 2

[0018] Take the following amounts of ingredients: 70 parts of benzyl alcohol, 7 parts of hydrofluoric acid, 40 parts of triethanolamine, 40 parts of water, 7 parts of nonylphenol ethoxylate, placed in a mixing container, fully stirred After mixing evenly, it is formulated into a solvent-based paint remover for use.

[0019] The paint stripping method is as follows: the solvent-based paint remover 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 paint layer is foamed off, and the workpiece is placed. Rinse into clean water, the workpiece is clean and non-corrosive.

Embodiment 3

[0021] Take the following ingredients in the following amounts: Take the following ingredients: 85 parts of benzyl alcohol, 8 parts of hydrofluoric acid, 50 parts of triethanolamine, 50 parts of water, 8 parts of nonylphenol ethoxylate, set them Stir in the mixing vessel

After mixing evenly, it is formulated into a solvent-based paint remover for use.

[0022] 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 paint layer is foamed off, and the workpiece is placed. Rinse into the water, the workpiece is clean and non-corrosive.

Embodiment 4

[0024] Take the following amounts of ingredients: 100 parts of benzyl alcohol, 10 parts of hydrofluoric acid, 60 parts of triethanolamine, 60 parts of water, 1

0 parts of nonylphenol ethoxylates, placed in a mixing vessel, thoroughly stirred, and uniformly mixed, and then formulated into a solvent-based paint remover for use.

[0025] The stripping method is as follows: adding the configured solvent-type paint stripping agent to the paint stripping tank; immersing the painted workpiece in the bath for 5 minutes, taking out, observing the surface of the workpiece, foaming off the paint layer, and placing the workpiece Rinse into clean water, the workpiece is clean and non-corrosive.

It should be noted that the present invention is not limited to the above embodiment, and according to the creative spirit of the present invention, Other variations may be made by those skilled in the art, and variations made in accordance with the inventive spirit of the invention are intended to be included within the scope of the invention.

Claims

[Claim 1] A solvent-based paint remover comprising the following components in parts by weight: 60-100 parts of benzyl alcohol, 5-10 parts of hydrofluoric acid, 20-60 parts of triethanolamine, 30-100 Part of water, 5-10 parts of nonylphenol ethoxylate.

[Claim 2] The solvent-based paint remover according to claim 1, wherein the benzyl alcohol is 70-100 by weight.

[Claim 3] The solvent-based paint remover according to claim 1, wherein the hydrofluoric acid is 6-9 parts by weight.

[Claim 4] The solvent-based paint remover according to claim 1, wherein the triethanolamine has a weight fraction of 30-50.

[Claim 5] The solvent-based paint remover according to claim 1, wherein the water is in the range of 30 to 60 parts by weight.

[Claim 6] The solvent-based paint remover according to claim 1, wherein the phenolic polyoxyethylene ether is 6-9 parts by weight.

[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 lacquer layer on the surface of the workpiece is blistered or wrinkled, take it out, rinse or rinse the workpiece in clean water, and remove the lacquer layer from the surface of the workpiece.

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