A descaling tank cleaning agent, its preparation method and application

Abstract

The application discloses a descaling tank cleaning agent and a preparation method and application thereof. The descaling tank cleaning agent comprises inorganic alkali, organic alkali, tackiness remover, spreading agent, oil removal penetrant, stripping agent, swelling disintegrant and composite organic solvent. The descaling tank cleaning agent is environmentally friendly and non-polluting, does not contain ammonia nitrogen, halogen, nitrate, APEO, more than 200 toxic substances in the list of the EU REACH regulation, and passes the RoHS certification.

Description

Technical Field

[0001] This invention relates to the field of industrial cleaning agent technology, and in particular to a scale-removing and tank-cleaning agent, its preparation method, and its application. Background Technology

[0002] In PCB manufacturing, development, etching, and stripping are three sequential processes. During these processes, the PCB board and its surface materials undergo different changes in form and physicochemical properties under varying process conditions and chemical agents. Problems exist in the development / etching / stripping process: Due to the complex chemical and physical reactions occurring in the strong acid, strong alkali, and high-temperature processes involving the main components of dry film / wet film / ink, after achieving the desired process effect, residual substances adhere to various production equipment, causing adhesion, re-adhesion, and some substances becoming highly viscous, yellowish viscous substances that adhere to the rollers, tanks, and pipes of the equipment. As production continues, these substances may adhere to the board, causing serious product defects. Therefore, the developing tank, etching tank, and stripping tank all require periodic cleaning.

[0003] Currently, there are three main methods for cleaning developing tanks: acid-base maintenance, organic cleaning agents, and dry ice freezing. Acid-base maintenance is the longest-used method in the PCB industry. However, when acid is added to waste developer, it reacts with the resin in the dry film / wet ink, producing a highly viscous gel that adheres even more firmly to pipes, tank walls, and corners, making it increasingly difficult to clean and causing the developing tank to become dirtier with use. In acid-base maintenance, regardless of whether acid or alkali is added first, clumps will form; developing is carried out under alkaline conditions, so alkaline washing has very limited effect on the system. Currently, there are two main types of organic cleaning agents available on the market: organic acids, which also suffer from the shortcomings of acid-base maintenance; and alkaline agents, mainly organic amine solvents, which have some effect on surface dirt but cannot remove the stickiness of the ink residue after washing, ultimately failing to achieve a good cleaning effect. Furthermore, these cleaning agents contain large amounts of organic amines, nitrates, phosphates, etc., causing severe pollution and making wastewater treatment very difficult. In the past two years, some suppliers have used the cooling effect of dry ice to spray dry ice inside equipment, causing dirt to cool and freeze, and then blow it off with high-pressure air to achieve the purpose of cleaning. However, the effectiveness of this method is currently very limited. It cannot clean the inside of equipment, pipes, or corners of equipment, leaving many dead corners. In addition, it requires suppliers to provide specialized equipment and personnel to carry out on-site cleaning, which is time-consuming, expensive, and has very limited practical value. Summary of the Invention

[0004] The present invention aims to at least solve one of the aforementioned technical problems existing in the prior art. Therefore, the object of the present invention is to provide a scale-removing and tank-cleaning agent, its preparation method, and its application.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] According to a first aspect of the present invention, a scale remover and tank cleaner is provided, comprising an inorganic alkali, an organic alkali, an anti-sticking agent, a spreading agent, an oil-removing and penetrating agent, a stripping agent, a swelling and disintegrant, and a composite organic solvent.

[0007] In some embodiments of the present invention, the scale-removing and tank-cleaning agent comprises 1wt% to 5wt% inorganic alkali, 1wt% to 5wt% organic alkali, 10wt% to 30wt% anti-sticking agent, 5wt% to 15wt% spreading agent, 2wt% to 10wt% degreasing and penetrating agent, 1wt% to 5wt% stripping agent, 1wt% to 5wt% swelling and disintegrant agent, and 5wt% to 10wt% composite organic solvent.

[0008] In some preferred embodiments of the present invention, the scale-removing and tank-cleaning agent is composed of inorganic alkali, organic alkali, anti-sticking agent, spreading agent, degreasing and penetrating agent, stripping agent, swelling and disintegrant, composite organic solvent and water.

[0009] In some preferred embodiments of the present invention, the scale-removing and tank-cleaning agent is composed of 1 wt% to 5 wt% inorganic alkali, 1 wt% to 5 wt% organic alkali, 10 wt% to 30 wt% anti-sticking agent, 5 wt% to 15 wt% spreading agent, 2 wt% to 10 wt% degreasing and penetrating agent, 1 wt% to 5 wt% stripping agent, 1 wt% to 5 wt% swelling and disintegrant agent, 5 wt% to 10 wt% composite organic solvent, and the balance being water.

[0010] In some more preferred embodiments of the present invention, the inorganic base includes at least one of sodium hydroxide and potassium hydroxide.

[0011] In some preferred embodiments of the present invention, the organic base includes at least one selected from monoethanolamine, cyclohexylamine, N-methylethanolamine, and diisopropylamine. The organic base has a strong decomposition effect on free photopolymerizable monomers, photoinitiators, plasticizers, etc., in organic compounds; the lone pair electrons on the organic base can strongly attract the groups of high-molecular-weight organic compounds, thereby decomposing photopolymerizable monomers, photoinitiators, and plasticizers.

[0012] In some preferred embodiments of the present invention, the anti-sticking agent comprises at least one of modified sodium carboxymethyl cellulose (M-CMC-Na), vitamin E polyethylene glycol succinate (TPGS), and sodium bentonite (Na-Bentonite). In this invention, after the anti-sticking agent enters the water body of the equipment, it adheres to and coats the surface of ink residue / dirt, causing the dry film / ink residue to lose its stickiness and ensuring that it will not re-adhere to the pipes and cylinder walls after washing; preventing secondary adhesion of the film residue, which would affect the cleaning effect.

[0013] In some preferred embodiments of the present invention, the modified sodium carboxymethyl cellulose includes etherified sodium cellulose. Ether cellulose refers to a series of derivatives formed in an alkaline medium by the reaction of hydroxyl groups attached to cellulose molecules with an alkylating agent. Based on the different substituents, they can be divided into single ethers and mixed ethers. They can also be divided into four categories based on their ionicity after modification: nonionic cellulose ethers (such as alkyl cellulose ethers), anionic cellulose ethers (such as sodium carboxymethyl cellulose and sodium carboxymethyl hydroxyethyl cellulose), and cationic cellulose ethers.

[0014] In some preferred embodiments of the present invention, the spreading agent includes at least one of lignin sulfonate, calcium caseinate, soap, and rosin soap. The spreading agent in the present invention can significantly reduce the hydrophobicity of the surface of ink residue or dry film residue, allowing other components to better adhere to the dirt surface and ensuring the effectiveness of the cleaning agent.

[0015] In some preferred embodiments of the present invention, the degreasing penetrant comprises a compound product of at least one selected from cationic surfactants, anionic surfactants, or nonionic surfactants and a long-chain diisomeric aliphatic diol polyoxyethylene ether. The degreasing penetrant features rapid and uniform penetration, wettability, and emulsification; it can rapidly penetrate the three-phase interface of "water-oil-clumped dirt," and during the degreasing (oily film residue) process, it can penetrate large areas of oil, causing the oil on the tank surface to condense into "small spherical oil droplets," "linear oil flows," or "small thin, fluffy oil swirls," detaching from the tank and pipe surfaces, thereby achieving rapid decontamination.

[0016] In some preferred embodiments of the present invention, the stripping agent comprises at least one of propylene glycol block polyether, a bis(long-chain) quaternary ammonium salt or a sulfonate-type imidazoline, and sodium metasilicate pentahydrate; preferably, the propylene glycol block polyether comprises at least one of L31 and F38; preferably, the bis(long-chain) quaternary ammonium salt comprises at least one of bis(dodecyl)dimethylammonium chloride and bis(tetradecyl)dimethylammonium chloride, wherein the bis(long-chain) quaternary ammonium salt is a quaternary ammonium salt-type cationic surfactant with excellent emulsifying, wetting, dispersing and very strong iodine complexing ability; the sulfonate-type imidazoline maintains anionic properties in all pH ranges, has good detergency in both hard and soft water, is resistant to hard water and dielectrics, has calcium soap dispersing ability, good biodegradability, and is compatible with a variety of detergent components in a wide pH range, and is widely used in cleaning agent formulations.

[0017] In some preferred embodiments of the present invention, the swelling and disintegrant includes at least one of modified cellulose and microcrystalline cellulose. The addition of the swelling agent to the solution causes the polymer molecules in the solution to swell. Modified cellulose and microcrystalline cellulose are commonly used as adsorbents, suspending agents, diluents, and disintegrants, which can maintain the stability of emulsions and foams, maintain high-temperature stability, and improve the stability of liquids.

[0018] In some preferred embodiments of the present invention, the composite organic solvent includes at least one of dimethylformamide (DMF), tetrahydrofuran (THF), dimethyl sulfoxide (DMSO), cyclohexanone, methyl ketone, acetone, ethyl acetate, and isoamyl acetate.

[0019] According to a second aspect of the present invention, a method for preparing the aforementioned scale-removing and tank-cleaning agent is provided, comprising the following steps: dissolving an inorganic alkali, an organic alkali, an anti-sticking agent, a spreading agent, an oil-removing and penetrating agent, a stripping agent, a swelling and disintegrant, and a composite organic solvent one by one in 80±5wt% of total water, mixing them thoroughly, adding the remaining water, and continuing to stir to obtain the final product.

[0020] According to a third aspect of the present invention, an application of the aforementioned descaling and cleaning agent in cleaning PCB manufacturing tanks is proposed.

[0021] In some embodiments of the present invention, the tank includes at least one of a developing tank, an etching tank, and a stripping tank.

[0022] The beneficial effects of this invention are:

[0023] 1. The scale removal and tank cleaning agent of the present invention is environmentally friendly and pollution-free; it is free of ammonia nitrogen, halogens, nitrates, APEO, and more than 200 toxic substances listed in the EU REACH regulation, and is RoHS certified.

[0024] 2. The scale removal and cleaning agent of the present invention has a wide range of applications and can be used in the developing and cleaning of PCB dry film, inner layer, and solder resist (green oil, white oil, black oil, mixed development) processes or in the cleaning of PCB etching and stripping production lines.

[0025] 3. The scale remover and tank cleaner of the present invention is easy to use and can keep the tank clean and reduce product defects caused by dirt. Attached Figure Description

[0026] Figure 1 This is a picture of the PCB solder mask before cleaning in Experiment Example 3 of the present invention.

[0027] Figure 2 This is a picture of the PCB solder mask after cleaning in Experiment Example 3 of this invention.

[0028] Figure 3 This is a picture of the PCB solder mask before cleaning in Experiment Example 3 of the present invention.

[0029] Figure 4 This is a picture of the PCB solder mask after cleaning in Experiment Example 3 of this invention.

[0030] Figure 5 This is a picture of the PCB solder mask before cleaning in Experiment Example 3 of the present invention.

[0031] Figure 6 This is a picture of the PCB solder mask after cleaning in Experiment Example 3 of this invention.

[0032] Figure 7 This is a picture of the equipment production line for PCB multilayer circuits and precision circuits in Experiment Example 4 of the present invention before cleaning.

[0033] Figure 8 This is a picture of the equipment production line for PCB multilayer circuits and precision circuits after cleaning, as shown in Experiment Example 4 of this invention.

[0034] Figure 9 This is a picture of the equipment production line for PCB multilayer circuits and precision circuits in Experiment Example 4 of the present invention before cleaning.

[0035] Figure 10 This is a picture of the equipment production line for PCB multilayer circuits and precision circuits after cleaning, as shown in Experiment Example 4 of this invention. Detailed Implementation

[0036] The present invention will be further described in detail below through specific embodiments. Unless otherwise specified, the raw materials, reagents, or apparatus used in the embodiments and comparative examples are all available from conventional commercial sources or can be obtained by existing technical methods. Unless otherwise specified, the test or experimental methods are conventional methods in the art.

[0037] Examples 1-13

[0038] This embodiment prepares a scale-removing and tank-cleaning agent, the specific process of which is as follows:

[0039] Prepare the raw materials according to the composition in Table 1.

[0040] Anti-tack agent: S11100 and S11300 models; Guangzhou Huapu Environmental Protection Technology Co., Ltd.; mainly contains gluconate, TPGS, TX-10, sodium bentonite, etc.

[0041] Spreading agent mixture A: consists of polyether-modified trisiloxane (30% w / w), sodium pentaphosphate (20% w / w), calcium caseinate (10% w / w), and the balance deionized water.

[0042] Spreading agent mixture B: consists of polyether-modified trisiloxane (30% w / w), lignin sulfonate (40% w / w) and the balance being deionized water.

[0043] Oil-removing and penetrating agent compound A: It is obtained by compounding German Bessmann TO-8 / 1308 isomeric alcohol polyoxyethylene ether and BASF LF500 at a mass ratio of 3:1; Bessmann TO-8 / 1308 is provided by Guangzhou Fufeng Chemical (trading distributor); LF500 is provided by Guangzhou Honglin Chemical Technology Co., Ltd. (trading distributor).

[0044] Oil-removing penetrant compound B: BASF's LF131 and LF231 are compounded in a 1:1 mass ratio. Guangzhou Honglin Chemical Technology Co., Ltd. (trading distributor);

[0045] Scaling agent: It is prepared by mixing hydrolyzed maleic anhydride and methyl hydroxymethyl acrylate in a 1:1 mass ratio;

[0046] Disintegrant: It is composed of different types of modified cellulose (mainly a mixture of alkyl ether modified cellulose and carboxymethyl hydroxyethyl cellulose in a mass ratio of approximately 3:1) and microcrystalline cellulose in a mass ratio of 1:1.

[0047] Table 1

[0048]

[0049] The preparation method of the above-mentioned scale removal and tank cleaning agent is as follows:

[0050] S1: Weigh the above raw materials in 500mL portions, add about 80% of the remaining amount of deionized water to a 500mL glass beaker, and turn on mechanical stirring.

[0051] S2: Add the raw materials in the table above in a certain order (each beaker has a corresponding experimental number label), following the order of adding solids first and then liquids. When a solid is added, you need to wait until it is completely dissolved or evenly dispersed before adding the next material.

[0052] S3: After all materials have been added (including the remaining 20% ​​of deionized water), continue stirring for 5 minutes; after ensuring the system is stable and uniform, pour it into reagent bottles for later use, and affix the corresponding label number to the reagent bottles.

[0053] Comparative Examples 1-9

[0054] This comparative example prepared a scale-removing and tank-cleaning agent, the specific process of which is as follows:

[0055] The raw materials were prepared according to the composition in Table 2. The scale-removing and cleaning agents of Comparative Examples 1 to 9 were prepared according to the preparation method of the scale-removing and cleaning agents in Examples 1 to 13.

[0056] Table 2

[0057]

[0058] Experimental Example 1

[0059] This experimental example tests the cleaning effect of the above-mentioned scale-removing and tank-cleaning agent in the laboratory. The specific process is as follows:

[0060] Preparation of experimental samples: Use 4mm thick PP board to make 20 three-dimensional L-shaped corner brackets with a length of 50mm, width of 50mm, and height of 50mm for use in simulating the corner positions of the tank.

[0061] Preparation of dirt samples: Sticky dirt collected on-site at the PCB manufacturing plant is applied to the corners and surrounding areas of the L-shaped corner brackets, and then dried in a hot air oven at 60℃~65℃ for 1 hour (to accelerate the adhesion of dirt to the PP corner brackets and simulate the hardening of dirt).

[0062] Test method: Add 300 mL of scale removal and cleaning agent for Comparative Examples 1-9 and 11-13 to the numbered 1000 mL beakers respectively, then add 500 mL of deionized water, turn on the stirring (magnetic stirring) and heat to a constant temperature of 60±2℃; maintain stirring and constant temperature for 6 hours.

[0063] After the experiment, use tweezers to place the L-shaped bracket under a half-open faucet (approximately 1 / 3 open) and rinse for 1 minute. Then observe the state of the surface dirt and touch the dirt with your fingers to assess the dirt's adhesion.

[0064] The results are shown in Table 3.

[0065] Table 3

[0066]

[0067] Table 3 shows that when the following additives were not added to the scale-removing and cleaning agents in Comparative Examples 1-9, significant functional deficiencies and incomplete cleaning effects occurred. In Comparative Examples 1-3, without the addition of an anti-sticking agent, the surface dirt removed was highly adhesive, and some dirt adhered to the bottom of the beaker, requiring tools for cleaning. In Comparative Examples 4-6, without the addition of a spreading agent, the removed dirt had poor wettability, and some of the agent could not penetrate into the dirt, resulting in a cleaning effect that did not meet expectations. In Comparative Examples 7-9, without the addition of a disintegrant, the dirt was in large clumps; it was not easily crushed, and in practical applications, these large clumps of dirt easily clogged nozzles and pipes.

[0068] Examples 11-13 are optimized formulations; they have sufficient cleaning power against dirt; and their effects were evaluated against Comparative Examples 1-9. The evaluation results confirmed that, as reflected in Comparative Examples 1-9, the formulation lacked the corresponding function when a certain functional component was missing.

[0069] Specifically:

[0070] • For inorganic alkalis, regardless of whether sodium hydroxide, potassium hydroxide, or a mixture of the two in different proportions is used, there is no significant difference in the cleaning effect; and inorganic alkalis can be selected according to actual needs.

[0071] • Regarding organic bases; the types and contents of the organic bases did not show significant differences in the evaluated examples; this may be due to insufficient precision in the evaluation; when the selected organic bases are used in combination, the chemical synergistic effect of each organic base component will be better than when used alone; therefore, a compound ratio was used in the actual evaluation to ensure the cleaning effect.

[0072] • De-sticking agent: Performance differences shown in Comparative Examples 1-3: Without the use of de-sticking agent, both the residual dirt on the corner and the dirt that fell off the bottom of the beaker are very sticky, so de-sticking agent must be used.

[0073] • Spreading agent: Performance differences shown in Comparative Examples 4-6: Without the use of a spreading agent, the wettability of the dirt surface and interior is very poor. Therefore, this product must use a spreading agent. Data from Examples 11-13 and Comparative Examples 7-9 show that the difference in the content of each individual component in the compound spreading agent has no significant difference in spreading and wetting performance. Therefore, based on the synergistic effect of similar or related chemical substances, mixed spreading agents are used as the spreading agent scheme for the final evaluation in actual evaluation.

[0074] • Composite organic solvents: Since both film residue and ink residue are organic substances, and according to the chemical principle of "like dissolves like," organic solvents are essential components. Therefore, solutions without organic solvents are not considered. Because the selected organic solvents were chosen based on the main components of the dry film and ink, even though the content of each composite solvent varied greatly in Comparative Examples 1-9, the actual cleaning effect did not show any substantial difference. Therefore, all the organic solvents selected above can be used as components of the product. Considering the synergistic effect of similar or related chemical substances, mixed organic solvents are used as the final organic solvent solution for actual evaluation.

[0075] Experimental Example 2

[0076] This experimental example tests the cleaning effect of the scale removal and cleaning agent on PCB manufacturing equipment. The specific process is as follows:

[0077] Generally, the production processes (including materials such as inks and dry films used in production) and temperature parameters of PCB manufacturers are relatively stable, and monthly output and daily load are generally not significantly different. Therefore, within a single cycle (generally one month), the dirt adhering to the equipment is essentially the same, and it is assumed that the situation is basically consistent across each production line. This test example tested the cleaning effect of the descaling and cleaning agent on two solder resist lines (A and B) and two production lines (C and D). Specifically, two post-production cleaning tests were conducted (one evaluation per formula) in different months on solder resist line A (Formulas 1 and 2) and production line C (Formulas 6 and 7), respectively. Three post-production cleaning tests were conducted (one evaluation per formula) in different months on solder resist line B (Formulas 3, 4, and 5) and production line D (Formulas 8, 9, and 10), respectively, for a total of 10 cleaning tests. The specific cleaning operation was as follows:

[0078] 1. Completely drain the developer from the developing tank; remove the cotton filter (to reduce the resistance of the cotton filter to the pump), but do not remove the nozzle.

[0079] 2. Fill the tank with tap water to the appropriate level and start the machine to circulate for 15-20 minutes; drain the residual developer (if it is an acid etching tank, it needs to be cleaned with 5% sodium hydroxide solution first), slag, etc. in the pipes.

[0080] 3. Pour in the scale removal and cleaning agent of Examples 1 to 10 at a certain ratio (300ml / L to 500ml / L tank solution concentration) as required, then add tap water to the circulating liquid level, turn on the machine and heat it; note that before heating, the inlet and outlet valves of the chiller (or circulating cooling water) need to be manually closed; otherwise, the PLC will automatically turn on during the heating process.

[0081] 4. Set the heating temperature to 55℃, and when the temperature inside the tank reaches 50±2℃, circulate and clean for 4 to 6 hours (if the equipment has very severe scaling, the cleaning time needs to be extended to 8 hours). Then, stop the machine and discharge the wastewater.

[0082] 5. After drainage is complete, use a high-pressure water gun to rinse the inside and corners of the equipment.

[0083] 6. After the high-pressure water gun cleaning is complete, add a certain amount of tap water and circulate it for 20-30 minutes. If the water is still very dirty after one cleaning, you can repeat the rinsing with clean water until the water is clean.

[0084] 7. After rinsing, it can be used directly, or it can be circulated with sodium carbonate solution once before use; developing tank, stripping tank and alkaline etching tank do not require acid washing and neutralization (if it is an acid etching tank, rinse once with 2% hydrochloric acid aqueous solution).

[0085] Meanwhile, the control group was tested using traditional cleaning methods. The cleaning effect of the control group was tested in the developing tank or developing line of a complete set of PCB developing equipment (containing components such as self-controlled heating, pump sets, and sprayers). The specific process was as follows:

[0086] Control group acid-base washing: First, use 5% sulfuric acid and heat to 60±2℃ for 6-8 hours of circulating cleaning, then drain the wastewater; rinse with clean water for 5-10 minutes and drain; then use 5% sodium hydroxide and heat to 60±2℃ for 3-4 hours of circulating cleaning; then drain; rinse with clean water again; the cleaning process is complete.

[0087] Control group dry ice cleaning: This method uses specialized equipment (provided by the dry ice cleaning service provider; mainly composed of a cryogenic fluid pump, injection port, and pipeline pressurizer, its main function is to inject cryogenic liquid carbon dioxide into the pipes and corners of the developing tank / developing line). The liquid carbon dioxide is injected into the pipes, tank, and corners of the equipment, utilizing the heat absorption property of liquid carbon dioxide evaporation to freeze the dirt. The dirt is then blown off with high-pressure air to clean the equipment. This method has significant limitations; it cannot freeze the inside of the equipment, pipes, or areas with thick layers of dirt, resulting in a significantly reduced cleaning effect.

[0088] Control group organic cleaning agent cleaning: Add an organic cleaning agent of a certain concentration (basically 30% to 60%) into the tank; turn on the circulation and heat to 60±2℃; clean for 6 to 8 hours; after cleaning, rinse with a high-pressure water gun; then add clean water and circulate for cleaning.

[0089] The results are shown in Table 4.

[0090] Table 4

[0091]

[0092] As can be seen from Table 4, the descaling and cleaning agent of the present invention can achieve good cleaning effects on the developing tanks of the anti-soldering process and the developing tanks of the circuit process; it also has good cleaning effects on the inner wall of the pipe, pump head, tank corners, filter head, and light yellow viscous substances.

[0093] Comparison of cleaning effects of solder resist developing tank, results are as follows: Figures 1-6 As shown.

[0094] from Figures 1-6 As can be seen, after cleaning with the scale remover, the dirt on the edges and corners of the solder resist developing tank, the circulating pump casing, and the heating coils has been removed (the attached image shows the tank 6 hours after cleaning, before rinsing with a high-pressure water gun). When touched, the remaining dirt is soft, and the ink residue is not sticky when rubbed between the fingers. After high-pressure water gun cleaning, all remaining dirt was completely removed. This demonstrates that the scale remover has a good cleaning effect on the solder resist developing line.

[0095] Comparison of cleaning effects in circuit developing tanks, results are as follows: Figures 7-10 As shown.

[0096] from Figures 7-10 As can be seen, after cleaning the circuit developing tank with the scale remover, the cleaning effect on the filter heads and horizontal transmission gears in the equipment pipelines (the attached picture shows the area 6 hours after cleaning, before rinsing with a high-pressure water gun) is excellent; visible adhesive dirt has been completely removed; after cleaning with a high-pressure water gun, all remaining dirt has been completely removed. This proves that the scale remover has a good cleaning effect on solder resist developing lines.

[0097] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A scale-removing and tank-cleaning agent, characterized in that: The descaling and cleaning agent comprises 1wt%–5wt% inorganic alkali, 1wt%–5wt% organic alkali, 10wt%–30wt% anti-sticking agent, 5wt%–15wt% spreading agent, 2wt%–10wt% degreasing and penetrating agent, 1wt%–5wt% stripping agent, 1wt%–5wt% swelling and disintegrant agent, and 5wt%–10wt% composite organic solvent; The de-adhesive is model S11100 or S11300 from Guangzhou Huapu Environmental Protection Technology Co., Ltd. The spreading agent is composed of 30% w / w polyether-modified trisiloxane, 20% w / w sodium pentaphosphate, 10% w / w calcium caseinate and the balance deionized water, and / or composed of 30% w / w polyether-modified trisiloxane, 40% w / w lignin sulfonate and the balance deionized water. The oil-removing and penetrating agent is German Bessmann TO. 8 / 1308 isomeric alcohol polyoxyethylene ether and BASF LF500 are compounded in a mass ratio of 3:1, and / or are compounded from BASF LF131 and LF231 in a mass ratio of 1:

1. The swelling and disintegrant is prepared by mixing modified cellulose and microcrystalline cellulose in a 1:1 mass ratio; the modified cellulose is a mixture of alkyl ether modified cellulose and carboxymethyl hydroxyethyl cellulose in a 3:1 mass ratio. The stripping agent is prepared by mixing hydrolyzed maleic anhydride and methyl hydroxymethyl acrylate in a 1:1 mass ratio.

2. The scale-removing and tank-cleaning agent according to claim 1, characterized in that: The organic base includes at least one of monoethanolamine, cyclohexylamine, N-methylethanolamine, and diisopropylamine.

3. The scale-removing and tank-cleaning agent according to claim 1, characterized in that: The composite organic solvent includes at least one of dimethylformamide, tetrahydrofuran, dimethyl sulfoxide, cyclohexanone, methyl ketone, acetone, ethyl acetate, and isoamyl acetate.

4. A method for preparing a scale-removing and tank-cleaning agent as described in any one of claims 1 to 3, comprising the following steps: The inorganic alkali, organic alkali, anti-tack agent, spreading agent, degreasing and penetrating agent, stripping agent, swelling and disintegrant, and composite organic solvent are dissolved one by one in 80±5wt% of total water, mixed well, and then the remaining water is added. After stirring, the mixture is prepared.

5. The application of the descaling and cleaning agent as described in any one of claims 1 to 3 in cleaning PCB manufacturing tanks.

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