Hydrogen embrittlement prevention lossless paint remover

Abstract

The invention provides a hydrogen embrittlement-preventing lossless paint remover. The hydrogen embrittlement-preventing lossless paint remover is prepared from a surfactant, organic acid, a chelating agent, a volatilization inhibitor, a saponifying agent, an oxidizing agent and a solvent, the ratio of the surfactant to the organic acid to the chelating agent to the volatilization inhibitor to the saponifying agent to the oxidizing agent to the solvent is (0.7 to 1.3): (6.0 to 7.0): (15.0 to 16.0): (2.0 to 2.5): (0.7 to 1.0): (21.0 to 22.0): (51.2 to 53), and the ratio is a weight ratio. The nonylphenol polyoxyethylene ether and the isooctanol polyoxyethylene ether are used as surfactants, and the two materials have low toxicity and biodegradability, so that the toxicity of the paint remover can be reduced while the cleaning capability is ensured. In addition, the paint remover contains the alkaline saponifying agent, so that hydrogen embrittlement damage of acidic components in the paint remover to a metal carrier in long-term repeated use can be prevented.

Description

Technical Field

[0001] The invention relates to the technical field of material science, and in particular to a water-based paint stripper and a preparation method thereof. Background Art

[0002] Paint strippers are a type of film stripping agent, also known as paint removers. They are required to remove the coating without damaging the surface of the object being coated, shortening the operation time and improving the efficiency of coating. Paint strippers are generally used for baking varnish, spray paint, and epoxy resin coatings. Common paint strippers contain toxic and corrosive substances, and the active ingredients are usually difficult to biodegrade, which is harmful to the environment and aquatic organisms.

[0003] Moreover, the paint strippers in the prior art have a high acid content. During the paint stripping process, the acidic substances in the paint strippers usually cause hydrogen embrittlement damage to the metal carrier. Especially after multiple paint stripping and cleaning, the possibility of hydrogen embrittlement of the carrier is greatly increased.

[0004] Therefore, it is necessary to provide an aqueous cleaning agent that can both ensure paint stripping performance and reduce damage. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a hydrogen embrittlement-proof non-destructive paint stripping agent in view of the problems existing in the background technology.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A hydrogen embrittlement-proof nondestructive paint stripper, comprising a surfactant, an organic acid, a chelating agent, a volatility inhibitor, a saponifying agent, an oxidant and a solvent;

[0008] The ratio of the surfactant, organic acid, chelating agent, volatilization inhibitor, saponifier, oxidant and solvent is (0.7-1.3): (6.0-7.0): (15.0-16.0): (2.0-2.5): (0.7-1.0): (21.0-22.0): (51.2-53), and the ratio is a weight ratio.

[0009] Preferably, the surfactant consists of nonylphenol polyoxyethylene ether and isooctyl alcohol polyoxyethylene ether.

[0010] Preferably, the organic acid comprises formic acid and myristic acid.

[0011] Preferably, the chelating agent is dichloromethane.

[0012] Preferably, the volatility inhibitor is paraffin.

[0013] Preferably, the saponifying agent is sodium hydroxide.

[0014] Preferably, the oxidant is phenol.

[0015] Preferably, the solvent comprises an organic solvent and water, and the organic solvent consists of diphenoxymethane and toluene.

[0016] Preferably, the non-volatile matter content of the anti-hydrogen embrittlement non-destructive paint stripper is not less than 4%.

[0017] On this basis, the present invention also provides a hydrogen embrittlement-proof lossless paint stripper. The preparation method can prepare the above-mentioned hydrogen embrittlement-proof lossless paint stripper, and comprises the following steps:

[0018] (1) Weigh a certain amount of water and start stirring;

[0019] (2) Add surfactants in order according to the formula amount under stirring and stir until uniform;

[0020] (3) adding organic acids in order according to the formula amount, stirring until uniform, and adding chelating agents to different organic acids;

[0021] (4) Add the formulated amount of oxidant and stir until uniform;

[0022] (5) Add organic solvents in order according to the formula amount and stir until uniform;

[0023] (6) Add the formulated amount of volatility inhibitor and stir until uniform;

[0024] (7) Add the formulated amount of saponifier and stir until uniform.

[0025] The beneficial effects of the present invention are:

[0026] (1) The present invention uses nonylphenol polyoxyethylene ether and isooctyl alcohol polyoxyethylene ether as surfactants. Since these two materials have low toxicity and biodegradability, they can reduce the toxicity of the paint stripper while ensuring the cleaning ability.

[0027] (2) The present invention contains an alkaline saponifying agent, which can prevent the acidic components in the paint stripper from causing hydrogen embrittlement damage to the metal carrier during long-term repeated use. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is the original FTIR spectrum of the product obtained in Example 1 of the present invention.

[0029] Figure 2 This is the original FTIR matching comparison spectrum of the product obtained in Example 1 of the present invention.

[0030] Figure 3 This is the FTIR spectrum of the dried sample of the product obtained in Example 1 of the present invention.

[0031] Figure 4 This is the FTIR matching comparison spectrum of the dried sample of the product obtained in Example 1 of the present invention.

[0032] Figure 5 The original deuterated methanol phase of the product obtained in Example 1 of the present invention 1 H-NMR spectrum.

[0033] Figure 6 The deuterated chloroform phase of the product obtained in Example 1 of the present invention is 1 H-NMR spectrum.

[0034] Figure 7 This is the total ion current diagram of the original chloroform extract of the product obtained in Example 1 of the present invention. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand and implement the technical solution of the present invention, the present invention is specifically, clearly and completely described in the following embodiments in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Moreover, based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work, any modifications, equivalent substitutions, improvements, etc., should be included in the protection scope of the present invention.

[0036] Example 1

[0037] A hydrogen embrittlement-proof nondestructive paint stripper comprises 0.4 parts of nonylphenol polyoxyethylene ether, 0.3 parts of isooctyl alcohol polyoxyethylene ether, 4.5 parts of formic acid, 15 parts of dichloromethane, 2 parts of paraffin, 1.5 parts of tetradecanoic acid, 0.7 parts of sodium hydroxide, 21 parts of phenol, 0.2 parts of diphenoxymethane, 2.5 parts of toluene and 48.5 parts of water, all of which are parts by weight.

[0038] Mix the above formula as follows:

[0039] S1, weigh the water of the formula, start stirring, and control the speed between 100 and 400 rpm;

[0040] S2, adding the formulated amount of nonylphenol polyoxyethylene ether and stirring evenly;

[0041] S3, add the formulated amount of isooctyl alcohol polyoxyethylene and stir until uniform;

[0042] S4, adding the formulated amount of formic acid and stirring until uniform;

[0043] S5, adding a formulated amount of dichloromethane and stirring until uniform;

[0044] S6, adding the formulated amount of myristic acid and stirring until uniform;

[0045] S7, adding the formulated amount of phenol and stirring until uniform;

[0046] S8, adding the formulated amount of diphenoxymethane and stirring until uniform;

[0047] S9, add the formulated amount of toluene and stir until uniform;

[0048] S10, adding a prescribed amount of paraffin wax and stirring until uniform;

[0049] S11, adding a formula amount of sodium hydroxide, stirring until uniform, to obtain a product.

[0050] After heating at 105°C for 4 hours, the non-volatile content of the test sample was 4.47%.

[0051] The obtained product was sampled and the original sample and the dried sample were tested for composition, and the results were as follows: Figure 1-2 The original FTIR spectrum shown is Figure 3-4 The FTIR spectrum of the dried sample is shown in Figure 5 The original deuterated methanol phase shown 1 H-NMR spectrum, such as Figure 6 The deuterated chloroform phase of the dried sample shown 1 H-NMR spectrum, such as Figure 7 Shown is the total ion chromatogram of the original chloroform extract.

[0052] pass Figure 1-2 The FTIR matching comparison spectrum shows that the product contains phenol. Figure 3-4 The FTIR matching comparison spectrum of the dried sample shown in the figure shows the organic acid salt components in the product. Figure 5-6 shown 1 The H-NMR spectrum shows that the product contains phenol (6.7ppm, 7.1ppm), dichloromethane (5.5ppm), and paraffin (0.9ppm, 1.3ppm). Figure 7 The total ion current of the original chloroform extract shown can match the product containing dichloromethane, toluene, phenol, diphenoxymethane and paraffin. The above results verify the composition of the present invention.

[0053] The paint stripping agent prepared in this embodiment was used to perform surface paint stripping treatment on high-strength steel with a paint film thickness of less than 150 microns. The treatment time for each treatment did not exceed 30 minutes, and the treatment was performed once every 48 hours. After a total of 3 treatments, a delayed destruction experiment was performed. The experimental results showed that the high-strength steel did not break within 200 hours.

[0054] Example 2

[0055] A hydrogen embrittlement-proof nondestructive paint stripper comprises 0.7 parts of nonylphenol polyoxyethylene ether, 0.6 parts of isooctyl alcohol polyoxyethylene ether, 5 parts of formic acid, 16 parts of dichloromethane, 2.5 parts of paraffin, 2 parts of tetradecanoic acid, 1 part of sodium hydroxide, 22 parts of phenol, 0.5 parts of diphenoxymethane, 3.0 parts of toluene and 49.5 parts of water, all of which are parts by weight.

[0056] The above formula is mixed according to the method and sequence described in Example 1 to obtain the product.

[0057] After heating at 105°C for 4 hours, the non-volatile content of the test sample was 4.24%.

[0058] The paint stripping agent prepared in this embodiment was used to perform surface paint stripping treatment on high-strength steel with a paint film thickness of less than 150 microns. The treatment time for each treatment did not exceed 30 minutes, and the treatment was performed once every 48 hours. After a total of 3 treatments, a delayed destruction experiment was performed. The experimental results showed that the high-strength steel did not break within 200 hours.

[0059] Example 3

[0060] A hydrogen embrittlement-proof nondestructive paint stripper comprises 0.5 parts of nonylphenol polyoxyethylene ether, 0.4 parts of isooctyl alcohol polyoxyethylene ether, 4.8 parts of formic acid, 15.5 parts of dichloromethane, 2.25 parts of paraffin, 1.75 parts of tetradecanoic acid, 0.9 parts of sodium hydroxide, 21.5 parts of phenol, 0.3 parts of diphenoxymethane, 2.75 parts of toluene and 49 parts of water, all of which are in parts by weight.

[0061] The above formula is mixed according to the method and sequence described in Example 1 to obtain the product.

[0062] After heating at 105°C for 4 hours, the non-volatile content of the test sample was 4.35%.

[0063] The paint stripping agent prepared in this embodiment was used to perform surface paint stripping treatment on high-strength steel with a paint film thickness of less than 150 microns. The treatment time for each treatment did not exceed 30 minutes, and the treatment was performed once every 48 hours. After a total of 3 treatments, a delayed destruction experiment was performed. The experimental results showed that the high-strength steel did not break within 200 hours.

Claims

1. A non-destructive paint stripper for preventing hydrogen embrittlement, characterized in that: It is composed of surfactant, organic acid, chelating agent, volatilization inhibitor, saponifying agent, oxidant and solvent; The ratio of the surfactant, organic acid, chelating agent, volatilization inhibitor, saponifier, oxidant and solvent is (0.7-1.3): (6.0-7.0): (15.0-16.0): (2.0-2.5): (0.7-1.0): (21.0-22.0): (51.2-53), and the ratio is a weight ratio.

2. The anti-hydrogen embrittlement non-destructive paint stripper according to claim 1, characterized in that: The surfactant consists of nonylphenol polyoxyethylene ether and isooctyl alcohol polyoxyethylene ether.

3. The anti-hydrogen embrittlement non-destructive paint stripper according to claim 1, characterized in that: The organic acids include formic acid and myristic acid.

4. The anti-hydrogen embrittlement non-destructive paint stripper according to claim 1, characterized in that: The chelating agent is dichloromethane.

5. The anti-hydrogen embrittlement non-destructive paint stripper according to claim 1, characterized in that: The volatility inhibitor is paraffin.

6. The anti-hydrogen embrittlement non-destructive paint stripper according to claim 1, characterized in that: The saponifying agent is sodium hydroxide.

7. The anti-hydrogen embrittlement non-destructive paint stripper according to claim 1, characterized in that: The oxidant is phenol.

8. The anti-hydrogen embrittlement non-destructive paint stripper according to claim 1, characterized in that: The solvent comprises an organic solvent and water, and the organic solvent consists of diphenoxymethane and toluene.

9. The anti-hydrogen embrittlement non-destructive paint stripper according to claim 1, characterized in that: The non-volatile matter content of the anti-hydrogen embrittlement non-destructive paint stripper is not less than 4%.

10. A method for preparing a hydrogen embrittlement-proof non-destructive paint stripper, characterized in that: The method is configured to prepare the hydrogen embrittlement-proof non-destructive paint stripper according to any one of claims 1 to 9, and the preparation method comprises the following steps: (1) Weigh a certain amount of water and start stirring; (2) Add surfactants in order according to the formula amount under stirring and stir until uniform; (3) adding organic acids in order according to the formula amount, stirring until uniform, and adding chelating agents to different organic acids; (4) Add the formulated amount of oxidant and stir until uniform; (5) Add organic solvents in order according to the formula amount and stir until uniform; (6) Add the formulated amount of volatility inhibitor and stir until uniform; (7) Add the formulated amount of saponifier and stir until uniform.

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