Water-based cleaning agent for PVB conductive slurry and cleaning method
By using water-based cleaning agents, combined with detergent and recovery liquids with alcohol, polyethylene glycol (200) and protic acid, and combined with ultrasonic cleaning technology, the VOC exceeding standard, flammability and operating environment restrictions in the dissolving of PVB slurry stains in the prior art has been solved, and an efficient and safe cleaning effect is achieved.
Patent Information
- Application Number
- CN202411827024.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-11
- Publication Date
- 2025-03-21
AI Technical Summary
In the prior art, the use of organic solvents to dissolve PVB slurry stains has problems such as VOC exceeding the standard, flammability and operating environment restrictions, making it difficult to effectively remove stains and ensure safety.
A water-based cleaning agent is provided, including a washing liquid and a recovery liquid. The washing liquid is composed of alcohol, polyethylene glycol (200) and a buffer substance. The recovery liquid is composed of protic acid, alcohol and polyethylene glycol (200). The two are mixed in a ratio of 2:0-1, combined with ultrasonic cleaning technology to remove PVB slurry stains.
This water-based cleaning agent is non-toxic and harmless, reducing safety issues, high cleaning efficiency, low cost of using raw materials, suitable for cleaning and equipment maintenance of optoelectronic devices, and has no risk of VOC exceeding the standard and flammable.
Smart Images
Figure CN119663288A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of chemical technology, and in particular to a water-based cleaning agent and a cleaning method for PVB conductive slurry. Background Art
[0002] The booming development of the new energy industry and the continuous innovation in the electronics field have continuously improved the production and living standards of human beings. Conductive paste is an important component in the production of photovoltaic panels, electric vehicle batteries, circuit boards and other optoelectronic devices. PVB conductive paste is a type of conductive paste with polyvinyl butyral as the dispersion matrix. PVB has good solubility, water resistance, low viscosity, thermal stability and other characteristics, making it a widely used slurry dispersant. During the production process, the residual conductive paste will adhere tightly to the surface of the metal equipment after drying and curing, affecting the quality of subsequent products.
[0003] In the past, organic solvents were used to dissolve dried PVB slurry stains on metal equipment. However, organic solvents are often accompanied by excessive VOC (volatile organic compounds) and flammability, which limits their further application. Summary of the invention
[0004] In view of the above problems, the present application is proposed to provide a water-based cleaning agent and cleaning method for PVB conductive paste that overcomes the above problems or at least partially solves the above problems, comprising:
[0005] A water-based cleaning agent for PVB conductive paste, including a cleaning solution and a recovery solution;
[0006] The washing liquid comprises, by mass, 5-20% alcohol, 5-20% polyethylene glycol (200), 10-35% buffer substance, and the remainder is water;
[0007] The recovery solution comprises, by mass, 40-70% protonic acid, 15-20% alcohol, 5-10% polyethylene glycol (200), and the balance water;
[0008] The mixing ratio of the washing liquid to the recovery liquid is 2:0-1 by mass.
[0009] Furthermore, the protonic acid is lactic acid, acetic acid, citric acid, sulfuric acid, hydrochloric acid, etc.
[0010] Furthermore, the alcohol includes ethanol, ethylene glycol or glycerol.
[0011] Furthermore, the buffer substance is an acetic acid solution of sodium acetate, a lactic acid solution of sodium lactate or a citric acid solution of sodium citrate.
[0012] Furthermore, the pH value of the washing liquid is 4-6.
[0013] Furthermore, it also includes a defoaming agent, and the content of the defoaming agent does not exceed 3%.
[0014] Furthermore, it also includes a dispersant, and the content of the dispersant is 0.1-5%.
[0015] Furthermore, the dispersant is polyacrylic acid.
[0016] Furthermore, it also includes a surfactant, and the content of the surfactant is 0.1-5%.
[0017] A method for cleaning PVB conductive paste, the cleaning method is implemented by using any of the water-based cleaning agents described above, comprising the steps of:
[0018] Mixing the washing liquid and the recovery liquid in a preset ratio to obtain a cleaning agent, and controlling the pH of the cleaning agent to be 4-6;
[0019] The product to be cleaned is placed in the cleaning agent, and ultrasonic cleaning is performed for 10-40 minutes at 20-60kHz and 30-60°C to clean the product to be cleaned.
[0020] This application has the following advantages:
[0021] In the embodiments of the present application, in view of the disadvantages of the prior art that organic solvents dissolve PVB slurry, which are seriously polluted, have high operating risks, and are subject to large operating environment restrictions, the present application provides a water-based cleaning agent for PVB conductive slurry, including a cleaning solution and a recovery solution; by mass, the cleaning solution includes 5-20% alcohol, 5-20% polyethylene glycol (200), 10-35% buffer material, and the balance is water; by mass, the recovery solution includes 40-70% protonic acid, 15-20% alcohol, 5-10% polyethylene glycol (200), and the balance is water; by mass, the mixing ratio of the cleaning solution to the recovery solution is 2:0-1. The cleaning solution can remove the PVB slurry stains attached to the surface of the optoelectronic device, which is non-toxic and harmless, reduces safety issues, and the recovery solution ensures the cleaning ability of the cleaning solution, uses low raw material costs, has no toxic components in the cleaning agent, and has high cleaning efficiency, which plays an important role in the smooth production of optoelectronic devices and the cleaning and maintenance of related equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the description of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.
[0023] Figure 1This is a flow chart of steps of a method for cleaning PVB conductive paste provided in one embodiment of the present application;
[0024] Figure 2 This is the cleaning principle of a water-based cleaning agent for PVB conductive paste provided in one embodiment of the present application. DETAILED DESCRIPTION
[0025] In order to make the objects, features and advantages of the present application more obvious and understandable, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.
[0026] By analyzing the prior art, the inventors found that the prior art uses organic solvents to dissolve and remove the conductive paste attached to the surface of metal equipment. However, the use of organic solvents will cause VOC to exceed the standard and have an impact on the environment. At the same time, organic solvents are flammable and explosive. When used to clean electrical products, they have high requirements for the use environment, which limits the use scenarios and may also pose a safety hazard.
[0027] In the embodiments of the present application, in view of the disadvantages of the prior art that organic solvents dissolve PVB slurry, which are seriously polluted, have high operating risks, and are subject to large operating environment restrictions, the present application provides a water-based cleaning agent for PVB conductive slurry, including a cleaning solution and a recovery solution; by mass, the cleaning solution includes 5-20% alcohol, 5-20% polyethylene glycol (200), 10-35% buffer material, and the balance is water; by mass, the recovery solution includes 40-70% protonic acid, 15-20% alcohol, 5-10% polyethylene glycol (200), and the balance is water; by mass, the mixing ratio of the cleaning solution to the recovery solution is 2:0-1. The cleaning solution can remove the PVB slurry stains attached to the surface of the optoelectronic device, which is non-toxic and harmless, reduces safety issues, and the recovery solution ensures the cleaning ability of the cleaning solution, uses low raw material costs, has no toxic components in the cleaning agent, and has high cleaning efficiency, which plays an important role in the smooth production of optoelectronic devices and the cleaning and maintenance of related equipment.
[0028] It should be noted that, refer to Figure 2The chemical formula shown is the principle of the water-based cleaning agent proposed in this application in cleaning the PVB conductive paste on the metal surface, by decomposing the PVB resin into ammonium salt and hydroxyl, dissolving them in water, and achieving the removal of the PVB resin. The ethanol and polyethylene glycol (200) components in the washing liquid react with the hydroxyl and acetal fragments in the polyvinyl butyral, respectively, to achieve a solvation effect, and the organic acid can not only form salts with the amines in the paste, but also catalyze the re-hydrolysis of the acetal fragments into hydroxyl groups. Both reactions can increase the water solubility of the PVB paste stains, and the buffer substance can adjust the acidity to avoid corrosion of metal equipment.
[0029] The water-based cleaning agent proposed in this application mainly cleans polyvinyl butyral (PVB)-based conductive paste, including products such as photovoltaic silver paste, battery paste and circuit board ink.
[0030] In a specific implementation, the washing liquid comprises: ethanol: 20%, PEG-200: 20%, lactic acid 10%, and the remainder is water.
[0031] The recovery solution comprises: lactic acid: 70%, ethanol: 15%, PEG-200: 5%, and the balance is water.
[0032] The product to be cleaned was ultrasonically cleaned for 20 minutes at 30 kHz and 25° C., and the PVB slurry stains were completely dissolved.
[0033] In a specific implementation, the washing liquid comprises: ethanol: 15%, PEG-200: 10%, lactic acid solution of sodium lactate: 35%, and the remainder is water.
[0034] The recovery solution comprises: sulfuric acid: 35%, ethanol: 20%, PEG-200: 5%, and the balance is water.
[0035] The product to be cleaned was ultrasonically cleaned for 15 minutes at 25 kHz and 40° C., and the PVB slurry stains were completely dissolved.
[0036] In a specific implementation, the washing liquid comprises: ethylene glycol: 10%, PEG-200: 16%, lactic acid solution of sodium lactate: 27%, and the remainder is water.
[0037] The recovery solution comprises: hydrochloric acid: 40%, ethylene glycol: 20%, PEG-200: 5%, and the balance is water.
[0038] The product to be cleaned was ultrasonically cleaned for 40 minutes at 20 kHz and 30° C., and the PVB slurry stains were completely dissolved.
[0039] In a specific implementation, the washing liquid comprises: 25% glycerol, 5% PEG-200, 25% lactic acid solution of sodium lactate, and the remainder is water.
[0040] The recovery solution comprises: sulfuric acid: 35%, glycerol: 20%, PEG-200: 5%, and the balance is water.
[0041] The product to be cleaned was ultrasonically cleaned for 15 minutes at 30 kHz and 50° C., and the PVB slurry stains were completely dissolved.
[0042] In a specific implementation, the washing liquid comprises: ethanol: 18%, PEG-200: 18%, citric acid solution of sodium citrate: 25%, and the remainder is water.
[0043] The recovery solution comprises: sulfuric acid: 35%, ethanol: 20%, PEG-200: 5%, and the balance is water.
[0044] The product to be cleaned was ultrasonically cleaned for 10 minutes at 25 kHz and 60° C., and the PVB slurry stains were completely dissolved.
[0045] In a specific implementation, the washing liquid comprises: ethanol: 25%, PEG-200: 10%, acetic acid solution of sodium acetate: 35%, and the balance is water.
[0046] The recovery solution comprises: sulfuric acid: 40%, ethanol: 25%, PEG-200: 7%, and the balance is water.
[0047] The product to be cleaned was ultrasonically cleaned for 10 minutes at 30 kHz and 40° C., and the PVB slurry stains were completely dissolved.
[0048] The cleaning agents of the PVB conductive slurry prepared based on the above embodiments all have strong cleaning ability, low VOC content, low corrosion to metal equipment, and are non-flammable and environmentally friendly. The ingredients are low in cost, the preparation process is simple, and it can be prepared and used immediately to achieve efficient cleaning.
[0049] Next, a water-based cleaning agent and cleaning method for PVB conductive paste in this exemplary embodiment will be further described.
[0050] In one embodiment of the present application, the alcohol includes ethanol, ethylene glycol or glycerol.
[0051] It should be noted that the alcohol contained in the washing liquid and the recovery liquid is preferably the same type of alcohol.
[0052] In one embodiment of the present application, the buffer substance is an acetic acid solution of sodium acetate, a lactic acid solution of sodium lactate, or a citric acid solution of sodium citrate.
[0053] It should be noted that the pH of the solution is adjusted by the buffer substance so that the pH of the cleaning solution is within a preset range, the acidity of the cleaning solution is controlled, and it is ensured that the cleaning solution does not cause corrosion to metal equipment.
[0054] In one embodiment of the present application, the pH value of the washing liquid is 4-6.
[0055] It should be noted that keeping the pH of the washing liquid at 4-6 can more efficiently remove the PVB conductive paste dirt on the metal surface. At the same time, the acidity will not be too high to corrode the metal parts on the surface of the optoelectronic product.
[0056] In one embodiment of the present application, a defoaming agent is further included, and the content of the defoaming agent does not exceed 3%.
[0057] It should be noted that the defoaming agent is added to ensure that the cleaning agent does not generate bubbles during transportation, transfer and use, thereby affecting the cleaning effect.
[0058] In one embodiment of the present application, a dispersant is further included, and the content of the dispersant is 0.1-5%.
[0059] In one embodiment of the present application, the dispersant is polyacrylic acid.
[0060] It should be noted that adding polypropylene as a dispersant makes it easier to dissolve dirt and disperse the suspended matter, which will not gather near the product to be cleaned and affect the cleaning effect.
[0061] In one embodiment of the present application, a surfactant is further included, and the content of the surfactant is 0.1-5%.
[0062] In one embodiment of the present application, a method for cleaning PVB conductive paste is further provided, wherein the cleaning method is implemented by using any of the water-based cleaning agents described above, and comprises the following steps:
[0063] S110, mixing the washing liquid and the recovery liquid in a preset ratio to obtain a cleaning agent, and controlling the pH of the cleaning agent to be 4-6;
[0064] S120, placing the product to be cleaned in the cleaning agent, and performing ultrasonic cleaning for 10-40 minutes at 20-60kHz and 30-60°C to clean the product to be cleaned.
[0065] It should be noted that the mixing ratio of the washing liquid and the recovery liquid is 2:0-1. According to the decline effect of the cleaning ability of the washing liquid, the recovery liquid is added. The washing liquid will reduce its use effect with the increase of storage time and the number of uses. When the use effect of the washing liquid declines, an appropriate amount of recovery liquid can be added to regenerate the cleaning ability of the washing liquid and reduce the replacement frequency of the washing liquid. With the assistance of ultrasonic equipment, after the stains are loosened and dissolved, the cleaned equipment can be removed, the remaining stains can be washed off with clean water, and then dried.
[0066] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present application.
[0067] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.
[0068] The above is a detailed introduction to a water-based cleaning agent and cleaning method for PVB conductive paste provided by the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for general technicians in this field, according to the ideas of the present application, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present application.
Claims
1. A water-based cleaning agent for PVB conductive paste, characterized in that: Includes washing and recovery fluids; The washing liquid comprises, by mass, 5-20% alcohol, 5-20% polyethylene glycol (200), 10-35% buffer substance, and the remainder is water; The recovery solution comprises, by mass, 40-70% protonic acid, 15-20% alcohol, 5-10% polyethylene glycol (200), and the balance water; The mixing ratio of the washing liquid to the recovery liquid is 2:0-1 by mass.
2. The water-based cleaning agent according to claim 1, characterized in that: The alcohol includes ethanol, ethylene glycol or glycerol.
3. The water-based cleaning agent according to claim 1, characterized in that: The buffer substance is an acetic acid solution of sodium acetate, a lactic acid solution of sodium lactate or a citric acid solution of sodium citrate.
4. The water-based cleaning agent according to claim 1, characterized in that: The protonic acid is lactic acid, acetic acid, citric acid, sulfuric acid, hydrochloric acid and the like.
5. The water-based cleaning agent according to claim 1, characterized in that: The pH value of the washing liquid is 4-6.
6. The water-based cleaning agent according to claim 1, characterized in that: The composition also includes a defoaming agent, wherein the content of the defoaming agent does not exceed 3%.
7. The water-based cleaning agent according to claim 1, characterized in that: The invention also comprises a dispersant, wherein the content of the dispersant is 0.1-5%.
8. The water-based cleaning agent according to claim 1, characterized in that: The dispersant is polyacrylic acid.
9. The water-based cleaning agent according to claim 1, characterized in that: The composition further comprises a surfactant, wherein the content of the surfactant is 0.1-5%.
10. A method for cleaning PVB conductive paste, characterized in that: The cleaning method is implemented by the water-based cleaning agent according to any one of claims 1 to 9, comprising the steps of: Mixing the washing liquid and the recovery liquid in a preset ratio to obtain a cleaning agent, and controlling the pH of the cleaning agent to be 4-6; The product to be cleaned is placed in the cleaning agent, and ultrasonic cleaning is performed for 10-40 minutes at 20-60kHz and 30-60°C to clean the product to be cleaned.