An adhesive for MLCC that can effectively solve lamination bubbles

Abstract

The present invention relates to the technical field of adhesives, and in particular to an adhesive for MLCC that can effectively solve lamination bubbles, comprising the following components by mass: 5-10 parts of a first PVB resin; 5-10 parts of a second PVB resin; 0.01-5 parts of a third PVB resin; 0.01-0.5 parts of a PVA resin; 0.73-9.2 parts of an additive; and 75-85 parts of a solvent. Compared with the prior art, the adhesive for MLCC that can effectively solve lamination bubbles of the present invention starts from the PVB resin formula, and proposes a method that can effectively improve the bubble problem that may exist in the MLCC lamination process under the premise of excellent film-forming performance.

Description

[Technical field]

[0001] The present invention relates to the technical field of adhesives, and in particular to an adhesive for MLCC that can effectively resolve lamination bubbles. [Background technology]

[0002] The existing MLCC (chip multilayer ceramic capacitor) preparation process generally uses PVB for the early pulping and casting stages. The development of PVB adhesive is closely related to the MLCC production process. In order to obtain a good ceramic diaphragm, form a good bar, and finally sinter it into an MLCC component with qualified performance, this is bound to put forward certain requirements for PVB resin.

[0003] Among them, the performance requirements of ceramic film forming properties, stacking stability, sintering aid ability, etc. are the most prominent. Currently, the PVB adhesive resin on the market mainly relies on imported resin materials, which have excellent film forming properties, good compatibility with ceramic powders, and can generally form relatively stable cast ceramic films.

[0004] However, since the development of PVB resin does not completely correspond to the production of MLCC, no targeted modification has been made to the MLCC production process except for the film-forming part. As the requirements for MLCC increase, there are newer demands for its printing, lamination, capping, lamination, sintering and other processes, and MLCC manufacturers generally improve the process.

[0005] CN115763070A mentions a method for improving lamination bubbles for MLCC, which mentions the preparation of porcelain slurry. This technical solution helps improve lamination bubbles by adjusting the ratio of adhesive to plasticizer, the ratio of adhesive to porcelain powder, and the specific surface area of ​​porcelain powder. However, this technical solution mainly involves improving the lamination process and does not make special requirements and restrictions on adhesives.

[0006] CN111087248A mentions a special MLCC adhesive suitable for high-capacity thin dielectric ceramic film applications. As a polyvinyl butyral (PVB) adhesive, its main function is to solve the problem of poor quality of cast film and difficulty in peeling ceramic diaphragms from PET. It mainly relies on the addition of dispersants, defoamers, wetting agents and other modifying agents to improve the quality of cast film, without changing the structure of the PVB resin body, and because there are many types of modified additives added, and no modifiers are specifically added to the laminated bubbles, there may be negative effects.

[0007] CN115677359A mentions a two-component system PVB adhesive. It compounds high-polymerization degree and low-polymerization degree PVB resins to improve hot pressing performance. However, this technical solution does not take into account the difference in local thermodynamic properties caused by the inability to completely evenly distribute high-polymerization degree and low-polymerization degree molecules without modification, which may cause bubbles in the laminate. [Summary of the invention]

[0008] In order to overcome the above problems, the present invention proposes an adhesive for MLCC that can effectively solve the above problems and can effectively solve the problem of lamination bubbles.

[0009] The present invention provides a technical solution to solve the above technical problems: providing an adhesive for MLCC that can effectively solve the problem of lamination bubbles, comprising the following components by weight:

[0010]

[0011] Preferably, the sum of the mass fractions of the first PVB resin, the second PVB resin and the third PVB resin is less than 25 parts.

[0012] Preferably, the additives include a first additive, a second additive, a third additive, a fourth additive and a fifth additive;

[0013]

[0014] Preferably, the solvent includes methanol, ethanol, toluene and xylene;

[0015] The mass of the methanol accounts for 10-20% of the mass of the solvent;

[0016] The mass of the ethanol accounts for 20-60% of the mass of the solvent;

[0017] The mass of toluene accounts for 20-60% of the mass of the solvent;

[0018] The mass of xylene accounts for 0-5% of the mass of the solvent.

[0019] Preferably, the first PVB resin is polyvinyl butyral resin soluble in methanol, with a number average molecular weight of 40,000-80,000, a hydroxyl molar fraction of 25%-35%, and a glass transition temperature lower than 75°C.

[0020] Preferably, the second PVB resin is a polyvinyl butyral resin which is insoluble in methanol but soluble in toluene, has a number average molecular weight of 30,000-100,000, and a hydroxyl molar fraction of 10%-25%.

[0021] Preferably, the third PVB resin is an alcohol-soluble polyvinyl butyral resin with a number average molecular weight of 100,000-120,000, a hydroxyl molar fraction of more than 30%, and a glass transition temperature of less than 70°C.

[0022] Preferably, the PVA resin is a water-resistant PVA resin, and the alcoholysis degree is required to be less than 90%.

[0023] Preferably, the first additive is a plasticizer; the second additive is an acidifier; the third additive is a compatibilizer; the fourth additive includes a dispersant and a lubricant; and the fifth additive is a defoaming agent.

[0024] Preferably, the MLCC adhesive that can effectively solve the lamination bubbles can be prepared by the following method:

[0025] Step S1, using methanol to dissolve a first PVB resin to form a first glue paste;

[0026] Step S2, using ethanol to dissolve the first additive, the fourth additive and the fifth additive to obtain an additive dilution solution; using toluene to dissolve the compatibilizer;

[0027] Step S3, using ethanol to dissolve the PVA resin and the acidulant to obtain a formaldehyde-removing solution;

[0028] Step S4, after ethanol and toluene are fully mixed, the second PVB resin and the third PVB resin are added to obtain No. 2 glue;

[0029] Step S5, add No. 1 glue and formaldehyde-removing liquid into No. 2 glue in sequence, stir evenly and then slowly add additive diluent, continue to stir and dissolve fully, and thus obtain the adhesive for MLCC that can effectively solve the problem of lamination bubbles.

[0030] Compared with the prior art, the MLCC adhesive of the present invention that can effectively solve the problem of lamination bubbles starts from the PVB resin formula and proposes a method that can effectively improve the bubble problem that may exist in the MLCC lamination process under the premise of excellent film-forming performance. Using the formula of the present invention, the yield of MLCC lamination can be effectively improved at the same process level, and the performance is more obvious at a higher process level.

Brief Description of the Drawings

[0031] Figure 1 The present invention is a flow chart for preparing an adhesive for MLCC that can effectively solve the problem of lamination bubbles;

[0032] Figure 2 This is a sample preparation diagram of a low-speed casting process of Example 1 of the MLCC adhesive that can effectively solve the problem of lamination bubbles in the present invention;

[0033] Figure 3This is the first sample preparation diagram of the high-speed casting process slice of the embodiment 1 of the MLCC adhesive that can effectively solve the lamination bubble of the present invention;

[0034] Figure 4 This is the second sample preparation diagram of the high-speed casting process slice of Example 1 of the MLCC adhesive that can effectively solve the problem of lamination bubbles in the present invention. [Specific implementation method]

[0035] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and implementation examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0036] It should be noted that in the embodiments of the present invention, all directional indications (such as up, down, left, right, front, back, etc.) are limited to relative positions on the specified view, rather than absolute positions.

[0037] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0038] See also Figure 1 The MLCC adhesive of the present invention, which can effectively solve the problem of lamination bubbles, mainly involves two main resins, polyvinyl alcohol (PVA) and polyvinyl butyral (PVB), 2-4 solvents, 2-5 additives, and includes the following components by weight:

[0039] The first PVB resin 5-10 parts;

[0040] 5-10 parts of the second PVB resin;

[0041] The third PVB resin 0.01-5 parts;

[0042] The sum of the mass fractions of the first PVB resin, the second PVB resin and the third PVB resin is less than 25 parts;

[0043] PVA resin 0.01-0.5 parts;

[0044] Additives 0.73-9.2 parts;

[0045] The additives include a first additive, a second additive, a third additive, a fourth additive and a fifth additive;

[0046]

[0047]

[0048] The solvent includes methanol, ethanol, toluene and xylene;

[0049] The mass of the methanol accounts for 10-20% of the mass of the solvent;

[0050] The mass of the ethanol accounts for 20-60% of the mass of the solvent;

[0051] The mass of toluene accounts for 20-60% of the mass of the solvent;

[0052] The mass of xylene accounts for 0-5% of the mass of the solvent.

[0053] The first PVB resin is polyvinyl butyral resin soluble in methanol, with a number average molecular weight of 40,000-80,000, a hydroxyl molar fraction of 25%-35%, and a glass transition temperature lower than 75°C.

[0054] The second PVB resin is a polyvinyl butyral resin which is insoluble in methanol but soluble in toluene, has a number average molecular weight of 30,000-100,000, a hydroxyl molar fraction of 10%-25%, and has no limitation on glass transition temperature.

[0055] The third PVB resin is an alcohol-soluble polyvinyl butyral resin, with a number average molecular weight of 100,000-120,000, a hydroxyl molar fraction of more than 30%, and a glass transition temperature of less than 70°C.

[0056] The PVA resin is a PVA resin with certain water resistance, and the alcoholysis degree is required to be less than 90%. The specific addition amount is determined according to the comprehensive residual formaldehyde content of the PVB resin.

[0057] The amount of the additive added is adjusted and improved depending on the particle size of the ceramic powder and the film forming process.

[0058] The first additive is a plasticizer, and the main optional substances are dioctyl phthalate (DOP), triethyl citrate (TEC), dibutyl phthalate (DBP), diisotridecyl terephthalate (DMT), dioctyl terephthalate (DOTP), di-sec-octyl phthalate, diethylene glycol dibenzoate and other polyol ester plasticizers. The specific amount of addition depends on the type of plasticizer selected and the speed and temperature of the cast molding process. The main function of the first additive is to adjust the plasticity of the product cast film and increase the casting film forming performance.

[0059] The second additive is an acidulant, mainly hydrochloric acid and trichloroacetic acid, preferably added after being dissolved with PVA. If halogen-free is required, it can be an anhydride compound such as maleic anhydride, acetic anhydride, succinic anhydride, etc. The specific amount of addition needs to be determined by the amount of PVA resin added. The second additive mainly works with the PVA resin to process and consume the residual aldehyde that may exist in the PVB resin, avoiding the consumption of other additives by unconsumed aldehydes, and at the same time plays a role of micro-crosslinking to enhance the uniform dispersion between PVB resins of different molecular weights.

[0060] The third additive is a compatibilizer, which is mainly maleic anhydride modified polyethylene (MPE) or other olefin modified materials, and the maleic anhydride grafting rate of the material is 0.5%-5%. The third additive provides compatibility required to maintain the printability of the electrode material under special requirements of ceramic powder, especially in some other ceramic systems besides barium titanate and strontium zirconate.

[0061] The fourth additive includes dispersants and lubricants, mainly fatty acids, aliphatic amides and esters, and typical representatives are stearic acid monoglyceride (GMS), tristearate glyceride (HTG), erucic acid amide, oleic acid amide, etc. The fourth additive mainly provides the film material with a smooth effect and promotes the dispersion of the medium. A low addition amount is selected so that it can take effect during the dissolution process and partially fail in the finished product by heat, so as to avoid the residual smoothness from affecting the lamination positioning. At the same time, the interlayer smoothness also helps the bubbles to escape during lamination.

[0062] The fifth additive is a defoamer, mainly a silicone release agent. The fifth additive is mainly used to eliminate bubbles generated during the sol process.

[0063] The solvent mainly consists of four solvents: methanol, ethanol, toluene and xylene. The proportions thereof are adjusted so that they can stably volatilize in stages without residue during the film forming process. At the same time, different additives are helpful to take effect at different stages and then dissipate with temperature changes or become thermally ineffective, thereby ensuring that no residue remains after the ceramic cast film is formed, thereby affecting subsequent processes.

[0064] The total amount of the solvent added is the remaining mass fraction (about 75-85 parts) excluding the PVA resin, PVB resin and additives.

[0065] The methanol is mainly used to dissolve the first PVB resin. Methanol has a low boiling point and can effectively meet the rapid volatilization requirements during initial drying and molding, and effectively avoid wind marks that may exist during drying or surface horizontal lines caused by excessive volatilization speed.

[0066] The ethanol, as the main alcohol solvent, dissolves the second PVB resin and the third PVB resin, and as the main dispersion medium, also has good drying performance.

[0067] The toluene promotes dissolution and forms a mixed solvent with ethanol, thereby improving the viscosity of the glue solution and making its casting processing performance better.

[0068] The xylene has the highest boiling point and meets the last item of gradient volatilization. It is necessary to evaluate whether to add it according to the process to determine whether there is any solvent residue.

[0069] The MLCC adhesive of the present invention, which can effectively solve the problem of lamination bubbles, can be prepared by the following method:

[0070] Step S1, using methanol to dissolve a first PVB resin to form a first glue.

[0071] In step S1, a bottom scraping stirring paddle is used to prevent the first PVB resin from settling and agglomerating during the sol process. The sol temperature is 30-50°C, and a condensation reflux device is required to ensure that the solid content does not change significantly. The solution is dissolved for more than 40 minutes and stopped when no obvious lumps are seen, and then a No. 1 glue is obtained.

[0072] Step S2, using ethanol to dissolve the first additive, the fourth additive and the fifth additive to obtain an additive dilution solution; and using toluene to dissolve the compatibilizer.

[0073] In step S2, the mass fraction of ethanol is equal to the sum of the mass fractions of the first additive, the fourth additive and the fifth additive, and ethanol does not need to be heated when dissolving the first additive, the fourth additive and the fifth additive.

[0074] In the step S2, the mass fraction of toluene is 10 times the mass fraction of the compatibilizer, and the dissolution temperature is 60-70°C.

[0075] Special note: Some specified additives can be added directly when mixing the glue without dissolving them separately.

[0076] Step S3, using ethanol to dissolve the PVA resin and the acidulant to obtain a formaldehyde-removing solution.

[0077] In step S3, the mass fraction of ethanol is twice the sum of the mass fractions of the PVA resin and the acidulant.

[0078] Step S4, after ethanol and toluene are fully mixed, the second PVB resin and the third PVB resin are added to obtain No. 2 glue.

[0079] In step S4, a scraping stirring paddle is used to fully dissolve for more than 40 minutes, and the sol temperature is 30-50° C. A condensation reflux device needs to be configured to ensure that the solid content does not change significantly.

[0080] Step S5, add No. 1 glue and formaldehyde-removing liquid into No. 2 glue in sequence, stir evenly and then slowly add additive diluent, continue to stir and dissolve fully, and thus obtain the adhesive for MLCC of the present invention which can effectively solve the problem of lamination bubbles.

[0081] In step S5, add No. 1 glue and formaldehyde-removing liquid to No. 2 glue in sequence, stir thoroughly at 40-50°C for 60 minutes, then continue stirring and cool to below 40°C, slowly add additive diluent and xylene solvent that may need to be added over a period of about 10 minutes, continue stirring and dissolving thoroughly for at least 60 minutes, and obtain the adhesive. Stirring speed is 400-2000rpm.

[0082] The adhesive for MLCC and its preparation method which can effectively solve the problem of lamination bubbles of the present invention are described below with specific embodiments.

[0083] Embodiment 1

[0084] A preparation process is as follows: based on 1000 kg

[0085] Step A1: 70 kg of the first PVB resin is placed in 110 kg of methanol and fully dissolved in a scraped bottom reactor at a dissolution temperature of 30-50° C. for a dissolution time of more than 40 min to obtain No. 1 glue

[0086] Step A2, dissolving 60 kg of DOP plasticizer, 500 g of GMS, and 500 g of dimethylpolysiloxane in 61 kg of ethanol under stirring at room temperature to obtain an additive dilution solution 1.

[0087] Step A3, 4 kg of Sinopec PVA13-88 resin and 2 kg of maleic anhydride monomer are added to 12 kg of ethanol and stirred and dissolved at room temperature to obtain a formaldehyde-removing solution.

[0088] Step A4, 1 kg of FUSABOND E100 resin is added into 10 kg of toluene and heated to 60-70° C. to dissolve for 20 minutes to obtain an additive dilution solution 2.

[0089] Step A5, 100 kg of the second PVB resin and 30 kg of the third PVB resin are placed in a mixed solvent of 220 kg of ethanol and 320 kg of toluene using a scraped bottom reactor for full dissolution at a dissolution temperature of 30-50° C. for a dissolution time of more than 40 min to obtain No. 2 glue.

[0090] Step A6, adding No. 1 glue, formaldehyde removal solution, additive diluent 1, and additive diluent 2 into No. 2 glue over 10 minutes, and continuing to fully stir and dissolve at a speed of 1500 rpm for at least 60 minutes to obtain an adhesive.

[0091] Another feasible preparation process is as follows: based on 1000 kg

[0092] Step B1, same as step A1 above to obtain No. 1 glue.

[0093] Step B 2, the same as step A3 above to obtain the formaldehyde-removing solution.

[0094] Step B 3, put the components mentioned in step A2, step A4 and step A5 into a reactor, use a scraped bottom reactor to fully dissolve them, the dissolution temperature is 30-50°C, the dissolution time is longer than 40 minutes, and No. 2 mortar is obtained.

[0095] Step B 4, put No. 1 glue and formaldehyde-removing liquid into No. 2 glue, continue to fully stir and dissolve in No. 2 glue at a speed of 1500 rpm for at least 60 minutes, and obtain an adhesive.

[0096] The adhesive obtained in Example 1 was subjected to casting, printing, lamination, lamination, and cutting based on the barium titanate system ceramic powder. The data of the number of bubbles generated by ultrasonic analysis and observation of the blocks are as follows. Among them, the lamination bubble rate represents the material with density difference found in the blocks by ultrasonic scanning, which is considered to have poor lamination. The cutting pass rate is the proportion that meets the sintering requirements after cutting. After further exhaust of unqualified products, they can basically meet the sintering requirements through ultrasonic detection.

[0097] Pure BM-SZ resin adhesive Domestic resin adhesive Example 1 Adhesive Low speed casting process Laminated bubble rate 1.4% Laminated bubble rate 3.7% Laminated bubble rate 1.7% High-speed tape casting process Laminated bubble rate 4.1% Laminated bubble rate 4.1% Laminated bubble rate 2.0% Low speed casting process Cutting qualification rate 84% Cutting qualification rate 72% Cutting qualification rate 93% High-speed tape casting process Cutting qualification rate 80% Cutting qualification rate 64% Cutting qualification rate 81%

[0098] The test uses the Japanese Murata ultrasonic sensor to judge. The samples with abnormal echo are considered to have bubbles. For the samples with abnormal echo after exhaust, samples are taken for microscopic examination. Figure 2-4 As shown. Figure 2-4 It can be seen that individual bubbles still exist, but there is no stratification problem in the entire section, and the improvement in the lamination effect is quite obvious.

[0099] Embodiment 1 Detection of abnormal echo number Sampling principles Number of slices Low speed casting process 17 pieces Appearance intact, echo abnormality 1 High-speed tape casting process 20 pieces Appearance intact, echo abnormality 2

[0100] Other Examples (Note: The following solvents in brackets are the proportions of the solvents to all solvents)

[0101] category Example 2 Example 3 Example 4 Example 5 Example 6 PVB-1 5％ 5％ 7.5％ 7.5％ 10％ PVB-2 10％ 5％ 5％ 7.5％ 5％ PVB-3 5％ 5％ 2.5％ 5％ 5％ PVA 0.2％ 0.5％ 0.3％ 0.5％ 0.05％ Acidifier 0.1％ 0.5％ 0.15％ 0.25％ 0.05％ Plasticizers 3％ / 7％ 1％ 4％ Compatibilizer 0.25％ 0.5％ 0.2％ / / Dispersants / lubricants / / 0.05％ 0.05％ 0.05％ Defoaming agent / / 0.05％ 0.1％ 0.05％ Methanol 11.5％(15) 12.5％(15) 7.7％(10) 7.8％(10) 15.2％(20) Ethanol 26.8％(35) 29.2％(35) 30.9％(40) 31.2％(40) 30.3％(40) Toluene 38.2％(50) 37.6％(45) 30.9％(40) 39.1％(50) 30.3％(40) Xylene / 4.2％(5) 7.7％(10) / /

[0102] Specific brand and material type

[0103] category Example 2 Example 3 Example 4 Example 5 Example 6 PVB-1 Solutia Resin Sekisui resin Kuraray resin Hubei Watson Changchun CCP PVB-2 Solutia Resin Sekisui resin Kuraray resin Domestic resin Changchun CCP PVB-3 Solutia Resin Sekisui resin Domestic resin Domestic resin Changchun CCP PVA Kuraray PVA203 Kuraray PVA203 Kuraray PVA203 Sinopec PVA13-88 Sinopec PVA13-88 Acidifier Butyric anhydride Butyric anhydride Maleic anhydride Maleic anhydride Acetic anhydride Plasticizers DOP / DBP TEC DBP Compatibilizer MPE MPOE MPE / / Dispersants / lubricants / / Erucamide Erucamide Erucamide Defoaming agent / / Dimethicone Dimethicone Dimethicone

[0104] Effect manifestation (only expressed by the lamination bubble rate)

[0105] category Example 2 Example 3 Example 4 Example 5 Example 6 Low speed casting process 1.8％ 1.3％ 1.7％ 2.8％ 2.4％ High-speed tape casting process 3.1％ 2.1％ 3.1％ 3.6％ 3.0％

[0106] Compared with the prior art, the MLCC adhesive of the present invention, which can effectively solve the problem of lamination bubbles, treats the residual aldehyde that may exist in the PVB resin by adjusting the resin formula, thereby avoiding the generation of bubbles that may be included after lamination and before sintering. At the same time, by adjusting the PVB formula, the stability of the electrode printing link is improved, and the quality of the film material after printing the electrode is further improved, which is beneficial to the stability of the lamination. On this basis, appropriate and controlled additives are selected to be consumed after casting and printing, with a low residual value, so as to ensure the purity of the product as much as possible during the lamination process, thereby improving the lamination effect.

[0107] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any modifications, equivalent substitutions and improvements made within the concept of the present invention should be included in the patent protection scope of the present invention.

Claims

1. An adhesive for MLCC that can effectively solve lamination bubbles, characterized in that: By mass, it includes the following components: The first PVB resin 5-10 parts; 5-10 parts of the second PVB resin; The third PVB resin 0.01-5 parts; PVA resin 0.01-0.5 parts; Additives 0.73-9.2 parts; 75-85 parts of solvent; The first PVB resin is a polyvinyl butyral resin soluble in methanol, with a number average molecular weight of 40,000-80,000, a hydroxyl mole fraction of 25%-35%, and a glass transition temperature of less than 75°C; The second PVB resin is a polyvinyl butyral resin that is insoluble in methanol but soluble in toluene, has a number average molecular weight of 30,000 to 100,000, and a hydroxyl molar fraction of 10% to 25%; The third PVB resin is an alcohol-soluble polyvinyl butyral resin, with a number average molecular weight of 100,000 to 120,000, a hydroxyl mole fraction of more than 30%, and a glass transition temperature of less than 70° C. The solvent includes methanol, ethanol, toluene and xylene; The mass of methanol accounts for 10-20% of the mass of the solvent; The mass of the ethanol accounts for 20-60% of the mass of the solvent; The mass of toluene accounts for 20-60% of the mass of the solvent; The mass of xylene accounts for 0-5% of the mass of the solvent; The additives include a first additive, a second additive, a third additive, a fourth additive and a fifth additive; 0.5-7 parts of the first additive; The second additive 0.01-0.5 parts; The third additive 0.2-0.5 parts; The fourth additive 0.01-0.2 parts; The fifth additive 0.01-1 part; The first additive is a plasticizer; the second additive is an acidifier; the third additive is a compatibilizer; the fourth additive includes a dispersant and a lubricant; the fifth additive is a defoamer; The MLCC adhesive that can effectively solve the problem of lamination bubbles can be prepared by the following method: Step S1, using methanol to dissolve a first PVB resin to form a first glue paste; Step S2, using ethanol to dissolve the first additive, the fourth additive and the fifth additive to obtain an additive dilution solution; using toluene to dissolve the compatibilizer; Step S3, using ethanol to dissolve the PVA resin and the acidulant to obtain a formaldehyde-removing solution; Step S4, after ethanol and toluene are fully mixed, the second PVB resin and the third PVB resin are added to obtain No. 2 glue; Step S5, add No. 1 glue and formaldehyde-removing liquid into No. 2 glue in sequence, stir evenly and then slowly add additive diluent, continue to stir and dissolve fully, and thus obtain the adhesive for MLCC that can effectively solve the problem of lamination bubbles.

2. The MLCC adhesive that can effectively solve the problem of lamination bubbles according to claim 1, characterized in that: The sum of the mass fractions of the first PVB resin, the second PVB resin and the third PVB resin is less than 25 parts.

3. The adhesive for MLCC that can effectively solve the problem of lamination bubbles according to claim 1, characterized in that: The PVA resin is a water-resistant PVA resin, and the alcoholysis degree is required to be less than 90%.

Images