Environment-friendly hanger stripping liquid and preparation process thereof

Abstract

The invention relates to the field of stripping hanger liquid processing, in particular to environment-friendly stripping hanger liquid and a preparation process thereof. The cleaning agent is prepared from the following raw materials in percentage by weight: 10-15% of sulfuric acid, 3-6% of tetrasodium hydroxyethylidene diphosphate, 4-6% of sodium alcohol ether sulphate, 4-8% of N-methyl-2-pyrrolidone, 4-9% of cyclohexanol, 1-2% of phenolsulfonic acid, 4-7% of sodium hypochlorite, 5-9% of hydrogen peroxide, 3-4% of ferrous sulfate, 1-3% of sodium chloride, 4-8% of a wetting agent, 0.5-0.8% of a stabilizer, 2-3% of a thickening agent, 2-3% of a penetrant and the balance of pure water. Mild chemical components adopted in the formula replace strong nitric acid and strong alkali components in a traditional hanger stripping solution, the corrosivity of the hanger stripping solution is reduced, all the raw materials meet the environment-friendly requirement, and harmful substances cannot be generated in the production and use process, and the environment cannot be polluted.

Description

Technical Field

[0001] The present application relates to the field of rack stripping liquid processing, and more specifically, to an environmentally friendly rack stripping liquid and a preparation process thereof. Background Art

[0002] Rack stripping liquid, also known as rack stripping agent or rack stripping agent, is a key step in the manufacturing process of printed circuit boards. Electroplating is used to form the required metal coating on the circuit board. However, during the electroplating process, the rack (the device used to hang the circuit board in the electroplating tank) will inevitably be plated with a metal layer. As production proceeds, the coating on the rack will fall onto the circuit board, causing defects. Therefore, rack stripping liquid is needed to remove the coating on the rack.

[0003] However, in actual use, the performance of the stripping liquid may be affected by the material of the coating and the circuit board. The coating may be on a variety of circuit boards such as fiberglass, polyimide, polyurethane, and polyester. It is also possible that the same circuit board may have a copper coating or a tin coating, which makes the bonding strength between the metal coating and the circuit board layer different. Therefore, the effect of the stripping liquid may vary depending on the circuit board material or the metal coating, and sometimes it may not be possible to completely remove the metal coating on certain specific materials. In order to improve the efficiency of stripping liquid in removing metal coatings, some products will add strong chemical components such as strong nitric acid and strong alkali to enhance its cleaning ability.

[0004] However, the stripping liquid with strong nitric acid and strong alkali added is highly corrosive. If these components in the stripping liquid are not properly handled, they will cause serious environmental pollution once discharged into the environment. In addition, this type of stripping liquid is very likely to cause serious chemical burns and chemical dermatitis when in contact with human skin, bringing great health risks to users. At the same time, the strong acid and strong alkali components in the stripping liquid will release irritating gases during the volatilization process. After these gases are inhaled by the human body, they will have a strong irritating effect on the respiratory tract, causing a series of respiratory system symptoms such as respiratory inflammation, coughing, and dyspnea. Summary of the invention

[0005] In order to solve the problems of environmental pollution, gas volatilization and easy burns to human body caused by adding strong acid and strong alkali to the rack stripping liquid, the present application provides an environmentally friendly rack stripping liquid and a preparation process thereof.

[0006] In the first aspect, the present application provides an environmentally friendly rack stripping liquid, which adopts the following technical solution: An environmentally friendly rack stripping liquid is prepared from the following raw materials in percentage by weight: Sulfuric acid 10-15% Tetrasodium Hydroxyethylidene Diphosphate 3-6% Fatty alcohol polyoxyethylene ether sodium sulfate 4-6% N-Methyl-2-pyrrolidone 4-8% Cyclohexanol 4-9% Phenolsulfonic acid 1-2% Sodium hypochlorite 4-7% Hydrogen peroxide 5-9% Ferrous sulfate 3-4% Sodium chloride 1-3% Wetting agent 4-8% Stabilizer 0.5-0.8% Thickener 2-3% Penetrant 2-3% The remainder is pure water.

[0007] By adopting the above technical scheme, mild chemical components are used to replace the strong nitric acid and strong alkali components in the traditional stripping rack liquid, reducing the corrosiveness of the stripping rack liquid, and all raw materials meet environmental protection requirements, and no harmful substances will be generated during production and use to pollute the environment. In addition, when using this environmentally friendly stripping rack liquid, the damage to the circuit board material is reduced, reducing the risk of circuit board damage caused by corrosion. At the same time, the stripping rack liquid can more effectively remove the metal coating on a variety of circuit board materials, improving the effect of removing the metal coating. And most of the selected raw materials are less irritating to human skin, and by adding an appropriate amount of wetting agents, stabilizers and other ingredients, the irritation of the product is further reduced. During use, even if it comes into contact with human skin, the risk of chemical burns and chemical dermatitis can be reduced.

[0008] Ingredients such as sulfuric acid, N-methyl-2-pyrrolidone, and cyclohexanol in the stripping liquid can penetrate into the gap between the metal coating and the circuit board material, destroying the adhesion between the metal coating and the circuit board, thereby achieving the stripping effect. Oxidants such as sodium hypochlorite and hydrogen peroxide can decompose the organic components in the metal coating, making it easier to dissolve and remove. Mild surfactants such as tetrasodium hydroxyethylidene diphosphate and sodium polyoxyethylene fatty alcohol ether sulfate can reduce the surface tension of water, making it easier to penetrate into the tiny gap between the metal coating and the circuit board, while playing a cleaning and lubricating role. Inorganic salts such as ferrous sulfate and sodium chloride can adjust the pH value and ionic strength of the solution, which helps to improve the stability of the product and the efficiency of removing the metal coating. The thickener can adjust the viscosity of the solution to make it more suitable for the use requirements of different circuit board materials. At the same time, the thickener can also improve the adhesion and wall-hanging properties of the stripping liquid, so that the stripping liquid can be more evenly covered on the circuit board and extend the action time of the stripping liquid. The penetrant can further improve the permeability of the solution, allowing it to penetrate deeper into the gap between the glue and the circuit board, improving the efficiency of removing the metal coating. The stabilizer can prevent the solution from decomposing or deteriorating during storage and use, ensuring the stability and service life of the stripping rack liquid.

[0009] The stripping liquid of the present application can more effectively remove the metal coating on various circuit board materials through the synergistic effect of multiple components. The metal coating removal speed is fast and efficient, which can greatly save the user's time and energy. At the same time, the stripping liquid is suitable for various circuit board materials and metal coating types, and can meet the needs of different users.

[0010] Preferably, the penetrant is composed of potassium lauryl ether phosphate, sodium sulfate and fatty alcohol polyoxyethylene ether in a weight ratio of 5:(2-3):(4-6).

[0011] By adopting the above technical solution, the components and dosage of the penetrant are optimized, and the penetration ability of the stripping rack liquid is further improved, so that it can quickly penetrate into the tiny gap between the circuit board material and the glue, destroy the adhesion between the glue and the circuit board, and make the glue easier to peel off. Among them, potassium lauryl ether phosphate has good wetting and permeability, and can quickly penetrate into the gap between the glue and the circuit board at a lower concentration, thereby increasing the penetration rate of the liquid. Fatty alcohol polyoxyethylene ether has fixed hydrophilic and lipophilic groups, which can be arranged in a directional manner on the surface of the solution to reduce surface tension. Sodium sulfate plays a role in adjusting the ionic strength and osmotic pressure of the solution, which helps the penetrant to better penetrate into the target surface.

[0012] Preferably, the thickener is composed of phosphate betaine, carboxymethyl cellulose and polyacrylic acid in a weight ratio of 4:(1-2):(0.5-1).

[0013] By adopting the above technical solution, the type and composition of the thickener are optimized, so that the stripping liquid can adhere to the surface of the adherend and the adherend for a long time, and the stripping liquid can adhere to the circuit board more tightly and permanently when removing the metal coating, thereby improving the cleaning efficiency and effect. Among them, carboxymethyl cellulose is a highly efficient thickener that can increase the consistency of the stripping liquid. The increase in consistency means that the fluidity of the liquid on the circuit board is reduced, and it is easier to form a stable liquid film, thereby improving the wall hanging property. Polyacrylic acid can form a three-dimensional network structure in the solution. This structure can increase the cohesion of the liquid, making it more difficult to flow down from the circuit board. Phosphate-based betaine Phosphate-based betaine has good wettability and permeability, and can quickly penetrate into the tiny gaps of the circuit board material. Forming a tight bond with the circuit board helps to improve the adhesion of the stripping liquid.

[0014] Preferably, the phosphate betaine is one of lauryl hydroxypropyl phosphate betaine, tetradecyl hydroxypropyl phosphate betaine, hexadecyl hydroxypropyl phosphate betaine or octadecyl hydroxypropyl phosphate betaine.

[0015] The phosphate-based betaine has excellent thickening performance, adhesion and wall-hanging properties as well as stable chemical properties, which helps to improve the use efficiency of the stripping rack liquid and the metal plating removal effect.

[0016] Preferably, the stabilizer is composed of sodium ethylenediamine di-o-phenylacetate and magnesium chloride in a weight ratio of 2: (0.5-1).

[0017] By adopting the above technical solution, the type and amount of stabilizer are optimized, the stability of the rack stripping liquid is improved, and the solution can be prevented from decomposing or deteriorating during storage and use, thereby ensuring the stability and service life of the rack stripping liquid.

[0018] Preferably, the wetting agent is composed of glycerol and polyol ester in a weight ratio of 3:(5-8).

[0019] By adopting the above technical solution, the wettability of the stripping rack liquid is further improved, the surface tension between the stripping rack liquid and the circuit board material is reduced, and the stripping rack liquid can more easily penetrate into the tiny gaps of the circuit board material and closely contact the metal coating, which helps to accelerate the decomposition and removal process of the metal coating. The glycerol molecules can carry other effective ingredients in the stripping rack liquid (such as sodium hypochlorite, hydrogen peroxide, etc.) to penetrate into the metal coating, while the polyol ester can further soften and decompose the glue, making it easier to remove. The synergistic use of the two helps to improve the efficiency of removing the metal coating, especially for stubborn metal coatings that are difficult to remove.

[0020] Preferably, the polyol ester is one of pentaerythritol stearate, neopentyl glycol distearate, trimethylolpropane tristearate, glyceryl monooleate, glyceryl monostearate, sorbitan monostearate or sucrose fatty acid ester.

[0021] By adopting the above technical solution, the types of polyol esters are optimized, and the wetting and penetration properties of the environmentally friendly stripping rack liquid and the metal coating removal efficiency are further improved.

[0022] Preferably, it is prepared from the following raw materials in weight percentage: Sulfuric acid 10% Tetrasodium Hydroxyethylidene Diphosphate 3% Fatty alcohol polyoxyethylene ether sodium sulfate 5% N-Methyl-2-pyrrolidone 7% Cyclohexanol 5% Phenolsulfonic acid 1.5% Sodium hypochlorite 5% Hydrogen peroxide 7% Ferrous Sulfate 3% Sodium chloride 2% Wetting agent 4% Stabilizer 0.7% Thickener 3 Penetrant 2% The remainder is pure water.

[0023] By adopting the above technical solution, the dosage of each component is further optimized, and the degumming rate and adaptability of the environmentally friendly stripping rack liquid are further improved.

[0024] In a second aspect, the present application provides a process for preparing an environmentally friendly rack stripping liquid, which adopts the following technical solution: A preparation process of an environmentally friendly rack stripping liquid comprises the following preparation steps: According to weight percentage, sulfuric acid, tetrasodium hydroxyethylidene diphosphate, sodium fatty alcohol polyoxyethylene ether sulfate, N-methyl-2-pyrrolidone, cyclohexanol, phenolsulfonic acid, sodium hypochlorite, hydrogen peroxide, ferrous sulfate, sodium chloride, a wetting agent, a stabilizer, a thickener, a penetrant and pure water are uniformly mixed to obtain an environmentally friendly stripping rack liquid.

[0025] By adopting the above technical solution, each component can be fully mixed and evenly mixed to play a better role, thereby improving the degumming rate and adaptability of the environmentally friendly stripping rack liquid.

[0026] In summary, this application has the following beneficial effects: 1. Use sulfuric acid, tetrasodium hydroxyethylidene diphosphate, sodium sulfate of fatty alcohol polyoxyethylene ether, N-methyl-2-pyrrolidone, cyclohexanol, phenolsulfonic acid, sodium hypochlorite, hydrogen peroxide, ferrous sulfate, sodium chloride, wetting agent, stabilizer, thickener, penetrant and pure water to prepare environmentally friendly stripping and hanging liquid, which can more effectively remove metal coatings on various circuit board materials and meet the needs of different users. The stripping and hanging liquid uses environmentally friendly raw materials, does not contain harmful substances such as strong nitric acid and strong alkali, and is harmless to the environment and human health. The waste gas, waste water and waste residue generated during use are less pollutants, which meets environmental protection requirements and relevant regulations and standards. DETAILED DESCRIPTION Example

[0027] Example 1 An environmentally friendly rack stripping liquid is prepared by the following method: Mix 100g of sulfuric acid, 30g of tetrasodium hydroxyethylidene diphosphate, 60g of sodium fatty alcohol polyoxyethylene ether sulfate, 80g of N-methyl-2-pyrrolidone, 90g of cyclohexanol, 20g of phenolsulfonic acid, 70g of sodium hypochlorite, 90g of hydrogen peroxide, 40g of ferrous sulfate, 30g of sodium chloride, 80g of wetting agent (glycerol), 8g of stabilizer (sodium ethylenediamine di-o-phenylacetate), 30g of thickener (dodecyl hydroxypropyl phosphate betaine), 30g of penetrant (potassium lauryl ether phosphate) and 342g of pure water to obtain an environmentally friendly stripping rack liquid.

[0028] The difference between Example 2-3 and Example 1 is that the types, amounts and experimental parameters of the raw materials for preparing the environmentally friendly rack stripping liquid are different. The specific differences are shown in Table 1: Table 1 Types, amounts and experimental parameters of raw materials for preparing environmentally friendly rack stripping liquid in Examples 1-3.

[0029] Example 4 An environmentally friendly rack stripping liquid is prepared by the following method: Mix 100g of sulfuric acid, 30g of tetrasodium hydroxyethylidene diphosphate, 50g of sodium fatty alcohol polyoxyethylene ether sulfate, 70g of N-methyl-2-pyrrolidone, 50g of cyclohexanol, 15g of phenolsulfonic acid, 50g of sodium hypochlorite, 70g of hydrogen peroxide, 30g of ferrous sulfate, 20g of sodium chloride, 40g of wetting agent (glycerol), 7g of stabilizer (sodium ethylenediamine di-o-phenylacetate), 30g of thickener (dodecyl hydroxypropyl phosphate betaine), 20g of penetrant (potassium lauryl ether phosphate) and 418g of pure water to obtain an environmentally friendly stripping rack liquid.

[0030] Example 5 An environmentally friendly rack stripping liquid. The difference between this embodiment and embodiment 1 is that the penetrant is composed of potassium lauryl ether phosphate, sodium sulfate and fatty alcohol polyoxyethylene ether in a weight ratio of 5:2:4.

[0031] Example 6 An environmentally friendly rack stripping liquid. The difference between this embodiment and embodiment 1 is that the penetrant is composed of potassium lauryl ether phosphate, sodium sulfate and fatty alcohol polyoxyethylene ether in a weight ratio of 5:3:6.

[0032] Example 7 An environmentally friendly rack stripping liquid, the difference between this embodiment and embodiment 5 is that the penetrant is composed of potassium lauryl ether phosphate and sodium sulfate in a weight ratio of 5:2.

[0033] Example 8 An environmentally friendly rack stripping liquid. The difference between this embodiment and embodiment 5 is that the penetrant is composed of potassium lauryl ether phosphate and fatty alcohol polyoxyethylene ether in a weight ratio of 5:4.

[0034] Example 9 An environmentally friendly stripping and hanging rack liquid. The difference between this embodiment and embodiment 1 is that the thickener is composed of phosphate-based betaine, carboxymethyl cellulose and polyacrylic acid in a weight ratio of 4:1:0.5.

[0035] Example 10 An environmentally friendly stripping and hanging rack liquid. The difference between this embodiment and embodiment 5 is that the thickener is composed of phosphate-based betaine, carboxymethyl cellulose and polyacrylic acid in a weight ratio of 4:2:1.

[0036] Embodiment 11 An environmentally friendly stripping and hanging rack liquid. The difference between this embodiment and embodiment 9 is that the thickener is composed of phosphate-based betaine and carboxymethyl cellulose in a weight ratio of 4:1.

[0037] Example 12 An environmentally friendly stripping and hanging rack liquid. The difference between this embodiment and embodiment 9 is that the thickener is composed of carboxymethyl cellulose and polyacrylic acid in a weight ratio of 1:0.5.

[0038] Embodiment 13 An environmentally friendly rack stripping liquid. The difference between this embodiment and embodiment 1 is that the stabilizer is composed of sodium ethylenediamine di-o-phenylacetate and magnesium chloride in a weight ratio of 2:0.5.

[0039] Embodiment 14 An environmentally friendly rack stripping liquid, the difference between this embodiment and embodiment 5 is that the stabilizer is composed of sodium ethylenediamine di-o-phenylacetate and magnesium chloride in a weight ratio of 2:1.

[0040] Embodiment 15 An environmentally friendly rack stripping liquid. The difference between this embodiment and embodiment 9 is that the stabilizer is composed of sodium ethylenediamine di-o-phenylacetate and magnesium chloride in a weight ratio of 2:1.

[0041] Example 16 An environmentally friendly stripping rack liquid, the difference between this embodiment and embodiment 1 is that the wetting agent is composed of glycerol and polyol ester in a weight ratio of 3:5.

[0042] Embodiment 17 An environmentally friendly stripping rack liquid, the difference between this embodiment and embodiment 5 is that the wetting agent is composed of glycerol and polyol ester in a weight ratio of 3:6.

[0043] Embodiment 18 An environmentally friendly stripping rack liquid, the difference between this embodiment and embodiment 9 is that the wetting agent is composed of glycerol and polyol ester in a weight ratio of 3:6.

[0044] Embodiment 19 An environmentally friendly stripping rack liquid. The difference between this embodiment and embodiment 13 is that the wetting agent is composed of glycerol and polyol ester in a weight ratio of 3:8.

[0045] Comparative Example Comparative Example 1 An environmentally friendly rack stripping liquid. The difference between this comparative example and Example 1 is that sodium aminotrimethylene phosphonate is used instead of tetrasodium hydroxyethylidene diphosphate.

[0046] Comparative Example 2 An environmentally friendly rack stripping liquid. The difference between this comparative example and Example 1 is that sodium methyl ester sulfonate is used instead of sodium fatty alcohol polyoxyethylene ether sulfate.

[0047] Comparative Example 3 An environmentally friendly rack stripping liquid. The difference between this comparative example and Example 1 is that dimethylformamide is used instead of N-methyl-2-pyrrolidone.

[0048] Comparative Example 4 An environmentally friendly rack stripping liquid. The difference between this comparative example and Example 1 is that ethanol is used instead of cyclohexanol.

[0049] Comparative Example 5 An environmentally friendly rack stripping liquid, the difference between this comparative example and Example 1 is that N, N-dimethylhydroxylamine is used instead of phenolsulfonic acid.

[0050] Comparative Example 6 An environmentally friendly rack stripping liquid. The difference between this comparative example and Example 1 is that sodium carbonate is used instead of sodium hypochlorite.

[0051] Comparative Example 7 An environmentally friendly rack stripping liquid, the difference between this comparative example and Example 1 is that ethanol is used instead of hydrogen peroxide.

[0052] Comparative Example 8 An environmentally friendly rack stripping liquid. The difference between this comparative example and Example 1 is that ammonium chloride is used instead of ferrous sulfate.

[0053] Comparative Example 9 An environmentally friendly rack stripping liquid. The difference between this comparative example and Example 1 is that potassium chloride is used instead of sodium chloride.

[0054] Comparative Example 10 An environmentally friendly rack stripping liquid, the difference between this comparative example and Example 1 is that ethanol is used instead of a thickener.

[0055] Comparative Example 11 An environmentally friendly rack stripping liquid, the difference between this comparative example and Example 1 is that ethanol is used instead of the penetrant.

[0056] Comparative Example 12 An environmentally friendly rack stripping liquid, the difference between this comparative example and Example 1 is that ethanol is used instead of the wetting agent.

[0057] Detection method / test method Fluidity test: prepare an iron plate with an inclination angle of 30° to the horizontal tabletop, draw a straight line at the end away from the ground, take 0.5 ml of the environmentally friendly peeling rack liquid prepared in Examples 1-19 and Comparative Examples 1-12, drop them on the straight line in turn, and then let them flow naturally, time for 30 seconds, and measure their flow distance.

[0058] Adaptability test of different substrates: prepare polyimide boards, polyurethane boards, polyester boards, polycarbonate copper boards, glass fiber boards and nylon boards, and measure copper layers on the surfaces of various boards. Polyimide board 31 is group A, and 1 ml of the environmentally friendly stripping rack liquid prepared in Examples 1-19 and Comparative Examples 1-12 is taken and sprayed on each copper-plated layer in turn. Let it stand for 10 minutes, then scrape off the copper layer, and observe whether there is copper residue on each polyimide board; 31 polyurethane boards are group B, and the test is carried out according to the steps of group A; 31 polyester boards are group C, and the test is carried out according to the steps of group A; 31 polycarbonate copper boards are group D, and the test is carried out according to the steps of group A; 31 glass fiber boards are group E, and the test is carried out according to the steps of group A; 31 nylon boards are group F, and the test is carried out according to the steps of group A.

[0059] Adaptability test of different coatings: prepare 5 groups of samples with different coatings, one group consists of 31 copper-plated polyurethane boards, which are placed horizontally, and 1 ml of the environmentally friendly stripping and hanging rack liquid prepared in Examples 1-19 and Comparative Examples 1-12 are sprayed on each sample in turn, let stand for 10 minutes, and then scrape off the copper layer to observe whether there is copper residue on each sample; the second group consists of 31 tin-plated layers, and the test is carried out according to a group of steps; the third group consists of 31 aluminum-plated layers, and the test is carried out according to a group of steps; the fourth group consists of 31 zinc-plated layers, and the test is carried out according to a group of steps; the fifth group consists of 31 nickel-plated layers, and the test is carried out according to a group of steps.

[0060] Deplating efficiency test: Prepare a group of polyurethane copper-plated boards, take 1 ml of the environmentally friendly stripping rack liquid prepared in Examples 1-19 and spray it on each polyurethane copper-plated board in turn, let it stand, and record the time for the copper layer of each polyurethane copper-plated board to fall off. The experimental data are shown in Table 2 and Table 3: Table 2 Experimental data of fluidity test and different wall adaptability test of Examples 1-19 and Comparative Examples 1-12 Table 3 Experimental data of different glue adaptability tests and degumming efficiency tests of Examples 1-19 and Comparative Examples 1-12 By comparing Example 1 with Comparative Examples 1-12, the flow distances in Comparative Examples 1-12 are all greater than those in Example 1, indicating that the adhesion of Comparative Examples 1-12 is less than that of Example 1; in practical tests on different walls, there is no glue residue in Example 1, and at least one of each of Comparative Examples 1-12 has glue residue; in different glue adaptability tests, there is no glue residue in Example 1, and at least one of each of Comparative Examples 1-12 has glue residue, indicating that the stripping and hanging rack liquid prepared by the formula in the present application has good retention, adaptability and metal layer removal, and can be applied to different circuit boards and different coatings.

[0061] Comparing Example 1 with Example 4, the flow distance in Example 4 is shorter than that in Example 1; in the degumming efficiency test, Example 4 uses a short time, which indicates that optimizing the dosage of each component in this application is beneficial to improving the liquid retention of the stripping rack and the metal-plating removal performance.

[0062] Comparing Example 1 with Example 5-6, the flow distance in Example 5-6 is shorter than that in Example 1; in the degumming efficiency test, the time used in Example 5-6 is shorter; Comparing Example 5 with Examples 7-8, the flow distance in Example 5 is greater than that in Examples 7-8; in the degumming efficiency test, the time used in Example 5 is short; It can be seen from the experimental data of Examples 1, 5-6 and Examples 5, 7-8 that optimizing the type and amount of penetrant is beneficial to improving the liquid retention and metal plating removal properties of the stripping rack.

[0063] Comparing Example 1 with Example 9, the flow distance in Example 9 is shorter than that in Example 1; in the degumming efficiency test, the time used in Example 9 is shorter; Comparing Example 5 with Example 10, the flow distance in Example 10 is shorter than that in Example 5; in the degumming efficiency test, the time used in Example 10 is shorter; Comparing Example 9 with Examples 11-12, the flow distances in Examples 11-12 are all greater than those in Example 1; in the degumming efficiency test, the time used in Example 9 is short; From the experimental data of Examples 1, 9 and 5, 9 and Examples 5, 10 and 9, 11-12, it can be seen that optimizing the type and amount of thickener is beneficial to improving the retention of the stripping rack liquid and the removal of the metal plating layer.

[0064] Comparing Example 1 with Example 13, the flow distance in Example 13 is shorter than that in Example 1; in the degumming efficiency test, the time used in Example 13 is shorter; Comparing Example 5 with Example 14, the flow distance in Example 14 is shorter than that in Example 5; in the degumming efficiency test, the time used in Example 14 is shorter; Comparing Example 9 with Example 15, the flow distance in Example 15 is shorter than that in Example 9; in the degumming efficiency test, the time used in Example 15 is shorter; It can be seen from the experimental data of Examples 1, 13 and 5, 14 and Examples 9, 15 that optimizing the type and amount of stabilizer is beneficial to improving the liquid retention and metal plating removal properties of the stripping rack.

[0065] Comparing Example 1 with Example 16, the flow distance in Example 16 is shorter than that in Example 1; in the degumming efficiency test, the time used in Example 16 is shorter; Comparing Example 5 with Example 17, the flow distance in Example 17 is shorter than that in Example 5; in the degumming efficiency test, the time used in Example 5 is shorter; Comparing Example 9 with Example 18, the flow distance in Example 18 is shorter than that in Example 9; in the degumming efficiency test, the time used in Example 18 is shorter; Comparing Example 13 with Example 19, the flow distance in Example 19 is shorter than that in Example 13; in the degumming efficiency test, the time used in Example 19 is shorter; It can be seen from the experimental data of Examples 1, 13 and 5, 14 and Examples 9, 15 that optimizing the type and amount of the wetting agent is beneficial to improving the retention of the stripping rack liquid and the efficiency of removing the plated metal layer.

[0066] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. An environmentally friendly rack stripping liquid, characterized in that: Prepared from the following raw materials in weight percentage: Sulfuric acid 10-15% Tetrasodium Hydroxyethylidene Diphosphate 3-6% Fatty alcohol polyoxyethylene ether sodium sulfate 4-6% N-Methyl-2-pyrrolidone 4-8% Cyclohexanol 4-9% Phenolsulfonic acid 1-2% Sodium hypochlorite 4-7% Hydrogen peroxide 5-9% Ferrous sulfate 3-4% Sodium chloride 1-3% Wetting agent 4-8% Stabilizer 0.5-0.8% Thickener 2-3% Penetrant 2-3% The remainder is pure water.

2. The environmentally friendly rack stripping liquid according to claim 1, characterized in that: The penetrant is composed of potassium lauryl ether phosphate, sodium sulfate and fatty alcohol polyoxyethylene ether in a weight ratio of 5: (2-3): (4-6).

3. The environmentally friendly rack stripping liquid according to claim 1, characterized in that: The thickener is composed of phosphate betaine, carboxymethyl cellulose and polyacrylic acid in a weight ratio of 4: (1-2): (0.5-1).

4. The environmentally friendly rack stripping liquid according to claim 2, characterized in that: The phosphate betaine is one of lauryl hydroxypropyl phosphate betaine, tetradecyl hydroxypropyl phosphate betaine, hexadecyl hydroxypropyl phosphate betaine or octadecyl hydroxypropyl phosphate betaine.

5. The environmentally friendly rack stripping liquid according to claim 1, characterized in that: The stabilizer is composed of sodium ethylenediamine di-o-phenylacetate and magnesium chloride in a weight ratio of 2: (0.5-1).

6. The environmentally friendly rack stripping liquid according to claim 1, characterized in that: The wetting agent is composed of glycerol and polyol ester in a weight ratio of 3: (5-8).

7. The environmentally friendly rack stripping liquid according to claim 6, characterized in that: The polyol ester is one of pentaerythritol stearate, neopentyl glycol distearate, trimethylolpropane tristearate, glyceryl monooleate, glyceryl monostearate, sorbitan monostearate or sucrose fatty acid ester.

8. The environmentally friendly rack stripping liquid according to claim 1, characterized in that: Prepared from the following raw materials in weight percentage: Tetrasodium Hydroxyethylidene Diphosphate 3% Fatty alcohol polyoxyethylene ether sodium sulfate 5% N-Methyl-2-pyrrolidone 7% Cyclohexanol 5% Phenolsulfonic acid 1.5% Sodium hypochlorite 5% Hydrogen peroxide 7% Ferrous Sulfate 3% Sodium chloride 2% Wetting agent 4% Stabilizer 0.7% Thickener 3 Penetrant 2% The remainder is pure water.

9. A process for preparing the environmentally friendly rack stripping liquid according to any one of claims 1 to 8, characterized in that: The method comprises the following preparation steps: According to weight percentage, sulfuric acid, tetrasodium hydroxyethylidene diphosphate, sodium fatty alcohol polyoxyethylene ether sulfate, N-methyl-2-pyrrolidone, cyclohexanol, phenolsulfonic acid, sodium hypochlorite, hydrogen peroxide, ferrous sulfate, sodium chloride, a wetting agent, a stabilizer, a thickener, a penetrant and pure water are uniformly mixed to obtain an environmentally friendly stripping rack liquid.

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