A ceramic green body binder, ceramic slurry, and preparation method and application thereof

Abstract

The application discloses a kind of ceramic green body binder, ceramic slurry and its preparation method and application, belong to electronic material technical field;The ceramic green body binder provided by the application is branched polyvinyl butyral ester, by selecting specific structure and certain branch chain proportion, the structure of the obtained binder has shorter main chain and longer branch chain, when it is further applied in the preparation of ceramic green body, since the branched polyvinyl butyral ester is taken out from the inside in the cutting process, the depth is shallow, so there are fewer unsaturated bonding sites, thereby the cutting adhesion degree between green bodies can be effectively reduced, and the green body cutting adhesion problem of multilayer ceramic capacitor product is improved.And the preparation method of the ceramic green body binder provided by the application is simple to operate, without special equipment, which is beneficial to actual production.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electronic materials, and particularly relates to a ceramic green body binder, ceramic slurry and a preparation method and application thereof. BACKGROUND

[0002] Chip multilayer ceramic capacitor (MLCC) is one of the most widely used electronic components, and plays an important role in many fields such as electronics, communication, 5G, computer science, household appliances, automobiles and the like. With the continuous improvement of industrial technology, the capacity performance of MLCC products is gradually moving towards ultra-high capacity, from pico farad to micro farad. Due to the effective improvement of the volume of large-size MLCC products, the designability of the capacity is also developed, and it is easier to break through the design of ultra-high capacity, and is widely used in 5G base station construction and automobile vehicle application, especially large-size products such as 3.2mm*2.5mm*2.5mm. However, when the green body is cut into a bar, due to the large size of the product, the thick cutting knife extrudes the bar, which is easy to cause the problem of adhesion after cutting. After adhesion, the green body needs to be separated by mechanical force, which is easy to cause micro cracks in the green body, and cracking problem in the subsequent firing process.

[0003] MLCC raw materials mainly consist of ceramic powder, binder, dispersant, solvent, functional additive and the like. Polyvinyl butyral (PVB) is an important binder in the preparation process of MLCC raw materials, which has the effects of protecting raw material powder, increasing the viscosity of raw material slurry, facilitating product film casting, promoting film band tight combination and the like. Straight-chain PVB is generally used as a binder in MLCC products (structural formula as shown in formula 1), but the straight-chain PVB will be taken out of the surface of the bar during the cutting process of large-size MLCC products. At this time, the PVB taken out has a large number of non-covalent binding sites on the surface, which is easy to form non-covalent bonds to cause the problem of adhesion of the green body after cutting;

[0004] SUMMARY

[0005] The present application aims to overcome the deficiencies of the prior art and provide a ceramic green body binder, a ceramic slurry and a preparation method and application thereof.

[0006] To achieve the above-mentioned purpose, in the first aspect of the present application, the present application provides a ceramic green body binder, the molecular structure of the ceramic green body binder is shown as formula I:

[0007]

[0008] Wherein, A is selected from any one of structure of formula II, formula III, formula IV, B is selected from any one of structure of formula V, formula VI, formula VII, C is selected from any one of structure of formula VIII, formula IX, formula X;

[0009]

[0010] The ceramic green body adhesive provided by the application is branched polyvinyl butyral (PVB), by selecting a specific structure, when it is applied to the preparation of the ceramic green body, the depth of PVB taken out from the inside during cutting is shallow, so the unsaturated bonding sites are less, thereby effectively reducing the cutting adhesion degree between green bodies and improving the cutting adhesion problem of large-size product green bodies.

[0011] As a preferred embodiment of the ceramic green body adhesive, in the ceramic green body adhesive, at least one of the following a-c is present:

[0012] a. the molecular weight proportion X of A is 1-4%, the molecular weight proportion Y of B is 1-5%, and the molecular weight proportion Z of C is 91-98%, based on the total molecular weight of the structure shown in formula I;

[0013] b. the molecular weight proportion of m is 0.08-4.5%, and the molecular weight proportion of n is 95.50-99.92%, based on the total molecular weight of the structure shown in formula I;

[0014] c. the number average molecular weight of the ceramic green body adhesive is 60-80kDal.

[0015] The application researches and finds that when the molecular weight proportion of the chain segment and the branched chain proportion in the structure of the ceramic green body adhesive are within the range given by the application, the obtained adhesive structure has a shorter main chain and a longer branched chain, thereby effectively reducing the cutting adhesion degree between green bodies during cutting and improving the cutting adhesion problem of large-size product green bodies when the ceramic green body adhesive is used in the preparation of the ceramic green body subsequently; meanwhile, when the number average molecular weight of the ceramic green body adhesive is 60-80kDal, the adhesive can be effectively dispersed and wrapped on the surface of the ceramic powder particles during the subsequent preparation of the ceramic slurry, avoiding that the ceramic powder particles are bonded too much due to the high molecular weight of the branched PVB, which easily leads to the subsequent cutting adhesion problem, and also avoiding that the bonding capacity is reduced due to the low molecular weight of the branched PVB, which leads to the problem of large-area dry cracking in the casting film forming process.

[0016] As a preferred embodiment of the ceramic green body adhesive, in the ceramic green body adhesive, at least one of the following d-f is present:

[0017] d. A accounts for 2-4% of the total molecular weight of the structure shown in Formula I, B accounts for 1-5% of the total molecular weight of the structure shown in Formula I, and C accounts for 91-97% of the total molecular weight of the structure shown in Formula I;

[0018] e. m accounts for 0.1-0.8% of the total molecular weight of the structure shown in Formula I, and n accounts for 99.20-99.90% of the total molecular weight of the structure shown in Formula I;

[0019] f. the number average molecular weight of the binder for the ceramic green body is 68-73 kDal.

[0020] The present application has found that the percentages of the molecular weights of A, B and C in the binder, the percentages of the molecular weights of m and n in the binder, and the number average molecular weight of the binder all have an effect on subsequent cutting adhesion, and when at least one of the above a, b and c is further selected, the binder obtained has a lower green body adhesion rate when applied to subsequent green body cutting, that is, the effect is better.

[0021] In a second aspect of the present application, the present application provides a preparation method of the binder for the ceramic green body, which comprises the following steps:

[0022] (1) mixing vinyl acetate and a cyclic branched monomer to perform a polymerization reaction to obtain a branched polyvinyl acetate;

[0023] (2) alcoholysis of the branched polyvinyl acetate to obtain a branched polyvinyl alcohol;

[0024] (3) mixing the branched polyvinyl alcohol and butyraldehyde to perform a polycondensation reaction, cooling after the polycondensation reaction and adjusting the pH value of the system to 5.5-6.5, collecting the precipitated solid and washing and drying to obtain the binder for the ceramic green body;

[0025] the structure of the cyclic branched monomer is shown in Formula XI,

[0026]

[0027] wherein R is selected from any one of the structures shown in (i)-(iii),

[0028] (i)

[0029] (ii)

[0030] (iii)

[0031] The application provides a preparation method of a ceramic green body binder, wherein vinyl acetate is used as a monomer, and a cyclic branched monomer is introduced into the monomer, wherein the cyclic branched monomer has a cyclic diene structure, and is high in reactivity, and the branched polymer generated by the reaction is more stable, and is more easily stably present in the ceramic slurry mixing sand mill dispersion process, thereby improving the sticking problem of the prepared green body during cutting.

[0032] As a preferred embodiment of the preparation method, in the step (1), the temperature of the polymerization reaction is 50-70 DEG C, and the polymerization reaction time is 7-12 h.

[0033] As a preferred embodiment of the preparation method, in the step (2), the alcoholysis process is that the branched polyvinyl acetate is completely dissolved in an alcohol aqueous solution, a catalyst concentrated hydrochloric acid is added, and then the alcoholysis reaction system is heated to obtain branched polyvinyl alcohol with a corresponding branched content.

[0034] As a preferred embodiment of the preparation method, in the step (2), the branched content of the branched polyvinyl acetate is 0.1-0.5%.

[0035] And / or, in the reaction system for alcoholysis of the branched polyvinyl acetate, the mass concentration of the branched polyvinyl acetate is 20-40%, the concentration of the concentrated hydrochloric acid is 0.5-2 mol / L. +

[0036] And / or, the alcoholysis temperature is 40-50 DEG C, and the alcoholysis time is 3-12 h.

[0037] Preferably, the number average molecular weight of the branched polyvinyl acetate is 70-90 kDal.

[0038] Preferably, in the step (2), the alcoholysis degree is 90-99%, and the number average molecular weight of the branched polyvinyl alcohol is 50-70 kDal.

[0039] Exemplarily, in the alcoholysis process, the alcohol is at least one selected from methanol, ethanol, propanol, isopropanol, n-butanol and tert-butanol.

[0040] As a preferred embodiment of the preparation method, in the step (3), in the polycondensation reaction system, the mass concentration of butyraldehyde is 10-30%, the concentration of the concentrated hydrochloric acid is 1-2 mol / L. +

[0041] And / or, the polycondensation reaction temperature is 35-45 DEG C, and the polycondensation reaction time is 4-8 h.

[0042] Preferably, in the step (3), after the polycondensation reaction is completed, the system is cooled and the pH value is adjusted to 6. ​​

[0043] Preferably, in the step (3), the pH value of the system is adjusted by using an alkaline reactant; for example, the alkaline reactant is selected from at least one of sodium hydroxide, sodium carbonate, sodium bicarbonate, and potassium hydroxide.

[0044] Preferably, in the step (3), the washing is sequentially performed by acid washing, water washing, and alcohol washing.

[0045] In the third aspect of the present application, the present application provides a ceramic slurry, components of the ceramic slurry comprising the binder for the ceramic green body.

[0046] The ceramic slurry provided by the present application comprises the binder for the ceramic green body, which can be adsorbed on the surface of the ceramic powder to protect the powder from being excessively damaged during sanding; and when different types of PVBs are contained in the system, the different PVBs are adsorbed together through non-covalent interactions (hydrogen bond, van der Waals force, hydrophobic force, electrostatic force, etc.), so that the crystal grains are uniformly dispersed and adhered; the non-covalently combined PVBs can effectively improve the viscosity of the slurry, thereby being beneficial to the subsequent casting preparation of film strips with different thicknesses for the multilayer ceramic capacitor (MLCC) product; at the same time, the PVBs can effectively increase the non-covalent binding capacity between the film strips during the lamination process of the MLCC product, so as to promote the close combination of the film strips during the lamination process.

[0047] As a preferred embodiment of the ceramic slurry of the present application, the ceramic slurry further comprises ceramic powder, dispersant, solvent, and functional additive.

[0048] As a preferred embodiment of the ceramic slurry of the present application, the ceramic slurry comprises the following components in mass percentage: ceramic powder 38-42%, dispersant 0.3-0.7%, solvent 43-46%, binder for the ceramic green body 8-11%, and functional additive 4-6%.

[0049] The ceramic powder is a conventional ceramic powder that can be used for the ceramic slurry, for example, the ceramic powder can be at least one of barium titanate with an average particle size of 150 nm, barium titanate with an average particle size of 200 nm, barium titanate with an average particle size of 250 nm, and barium titanate with an average particle size of 300 nm.

[0050] The dispersant is a conventional dispersant that can be used for the ceramic slurry, for example, the dispersant can be at least one of polyacrylamide with a molecular weight of 15-25 kDal, PVB with a molecular weight of 15-30 kDal, sodium stearate, sodium silicate, and sodium hexametaphosphate.

[0051] The solvent is a conventional solvent that can be used for the ceramic slurry, for example, the solvent can be at least one of toluene, methanol, ethanol, ethyl acetate, acetonitrile, tetrahydrofuran, and chloroform.

[0052] The functional additive is a functional additive commonly used in ceramic slurry, and the functional additive can be an oxide of La element or an oxide of transition metal element.

[0053] In the fourth aspect of the present application, a preparation method of the ceramic slurry is provided, and the preparation method comprises the following steps: mixing and sanding components to obtain the ceramic slurry.

[0054] Preferably, the sanding temperature is 0-10℃, the sanding time is 3-5h, the sanding stirring frequency is 800-1200rpm, and the sanding pump speed is 5-10L / min.

[0055] Preferably, zirconium balls with a diameter of 0.2-0.25mm are added during the sanding process, and the added mass of the zirconium balls is 8-15% of the total mass of the components of the ceramic slurry.

[0056] In the fifth aspect of the present application, a ceramic green body is provided, and the ceramic green body is prepared by using the ceramic slurry of the present application.

[0057] In the sixth aspect of the present application, a multilayer ceramic capacitor is provided, and the multilayer ceramic capacitor is prepared by using the ceramic green body of the present application.

[0058] Compared with the prior art, the present application has the following beneficial effects:

[0059] The binder for the ceramic green body provided by the present application is a branched polyvinyl butyral ester. By selecting a specific structure and a certain proportion of branches, the binder structure obtained has a shorter main chain and a longer branch chain. When the binder is applied to the preparation of the ceramic green body, the depth of the PVB taken out from the inside during the cutting process is shallow, and the number of unsaturated bonding sites is small, thereby effectively reducing the cutting adhesion degree between the green bodies and improving the green body cutting adhesion problem of the multilayer ceramic capacitor product. Specifically, the green body adhesion rate is below 1.9%. Moreover, the preparation method of the binder for the ceramic green body provided by the present application is simple to operate and does not require special equipment, which is conducive to actual production. DETAILED DESCRIPTION

[0060] For the purpose, technical scheme and advantages of the present application, the present application will be further described below in combination with specific embodiments.

[0061] The reagents, methods and equipment used in the present application are all conventional reagents, methods and equipment in the art unless otherwise specified.

[0062] Example 1

[0063] The embodiment of the present application provides a kind of ceramic green body binder, the number average molecular weight of the ceramic green body binder is 70kDal, and molecular structure formula is as shown in formula I:

[0064]

[0065] Wherein, A is selected from the structure shown in formula IV, B is selected from the structure shown in formula VII, and C is selected from the structure shown in formula X;

[0066] The molecular weight of A part accounts for X as 4% in the overall molecular weight of the structure shown in formula I, the molecular weight of B part accounts for Y as 1%, and the molecular weight of C part accounts for Z as 95%;

[0067] The molecular weight of m part accounts for 0.8% in the overall molecular weight of the structure shown in formula I, and the molecular weight of n part accounts for 99.2%;

[0068] The preparation process structure reaction formula of the ceramic green body binder is as shown in formula 2, wherein R in the cyclic branched monomer is (i) shown in the structure;

[0069]

[0070]

[0071] Specifically, the preparation process includes the following steps:

[0072] (1) vinyl acetate and cyclic branched monomer are mixed and stirred in a mass ratio of 96:4, and then heated to 60 DEG C reflux for 8h, to obtain branched polyvinyl acetate;

[0073] (2) the branched polyvinyl acetate (branched content is 0.1-5%, number average molecular weight is 70-90k Dal) prepared in step (1), methanol and water are mixed (the mass percentage of branched polyvinyl acetate is 26%, and the mass percentage of methanol is 25% based on the total mass of branched polyvinyl acetate, methanol and water), and then a catalyst concentrated hydrochloric acid is added to adjust the system H + The concentration is adjusted to 1mol / L, and then heated to 50 DEG C alcoholysis for 5h, to obtain branched polyvinyl alcohol suspension solution;

[0074] (3) the branched polyvinyl alcohol suspension solution prepared in step (2) and butyraldehyde are mixed (the mass percentage of branched polyvinyl alcohol is 8%, and the mass percentage of butyraldehyde is 20% based on the total mass of branched polyvinyl alcohol suspension solution and butyraldehyde), and then concentrated hydrochloric acid is added to adjust the system H +The concentration is up to 2 mol / L, then heated to 40-45℃ under reflux reaction for 6h, after the reaction, add sodium hydroxide to adjust the pH value of the reaction system to 6, collect the precipitated solid, sequentially washed with hydrochloric acid, pure water, ethanol, and finally vacuum dried at 40℃ to obtain a white powder of ceramic green body adhesive.

[0075] Examples 2-12 and Comparative Examples 1-8

[0076] Examples 2-12 and Comparative Examples 1-8 of the present application provide a ceramic green body adhesive, the difference between the preparation process and Example 1 is shown in Table 1, and the difference between the structure of the prepared adhesive and Example 1 is also shown in Table 1; wherein the data of m, n, X, Y, Z in Table 1 are in the form of the overall molecular weight of the structure shown in formula I, the molecular weight of each part accounts for %, the molecular weight is the number average molecular weight of the structure shown in formula I, the unit is k Dal, and the reflux time is h; at the same time, the related parameters in Example 1 are attached in Table 1;

[0077] Table 1

[0078]

[0079]

[0080] In Table 1, Comparative Example 7 and Comparative Example 8 do not add the cyclic branched monomer of structure XI during the preparation process, so that a straight chain PVB is prepared, and A, B and C in Comparative Structure 7 and Comparative Structure 8 are the corresponding A, B and C in structure 1, which are replaced by " / " here.

[0081] The number average molecular weight of the prepared adhesive is characterized by gel permeation chromatography (GPC) and high resolution liquid chromatography-mass spectrometry (HPLC-MS), and the characterization process is as follows: 1g of prepared PVB is added to 200mL of chromatographic pure ethanol solution, ultrasonic dissolved for 20min, after completely dissolved, take enough PVB ethanol solution into the liquid inlet, the mobile phase is 20% ethanol in toluene, the pump speed is 0.01L / min, after separating the PVB, take different section PVB solution into HPLC-MS, test the corresponding molecular weight.

[0082] Test Examples 1-21

[0083] The test example 1-20 of the present application provides a ceramic slurry, which comprises the following components in mass percentage: ceramic powder 40%, dispersant 0.5%, solvent 44.5%, ceramic green body binder 10%, and functional additive 5%. The ceramic powder is barium titanate with an average particle size of 150 nm, the dispersant is polyacrylamide with a molecular weight of 15-25 k Dal, the solvent is a mixture of toluene and ethanol with a mass ratio of 1:1, the functional additive is La2O3, and the binder is the binder prepared in the example 1-12 and the comparative example 1-8 of the present application, respectively.

[0084] The test example 21 of the present application provides a ceramic slurry, which is only different from the test example 8 in that the ceramic slurry comprises the following components in mass percentage: ceramic powder 40%, dispersant 0.5%, solvent 46.5%, ceramic green body binder 8%, and functional additive 5%. The preparation method of the ceramic slurry is as follows: 8% of zirconium balls with a diameter of 0.2-0.25 mm in total mass of the components of the ceramic slurry are added to the ceramic slurry, and the ceramic slurry is sand-milled at a stirring frequency of 1000 rpm at 0-10 ℃ for 4 h, wherein the pump speed is 8 L / min. After the sand-milling, the ceramic slurry is obtained.

[0085] Specifically, the structure of the binder in the ceramic slurry provided by the test example 1-21 and the performance index of the prepared ceramic slurry are shown in Table 2, wherein the performance index, the test process, and the standard requirement include the following aspects:

[0086] 1. Viscosity: the standard requirement is in the range of 200-300 cps, and the test process is as follows: 200 mL of the slurry is taken in a beaker, heated to 25 ℃ in a water bath, and the viscosity at a speed of 60 RPM at 25 ℃ is tested using a Brookfield Dv-I+ viscometer with a 63# rotor, with the unit of cps, to obtain the viscosity value of the slurry;

[0087] 2. Slurry particle size (D50): the standard requirement is 200-300 nm, and the test process is as follows: 0.2-0.5 g of the raw material slurry is taken, 5-10 g of ethanol is added to completely disperse the slurry, and the D50 value is recorded by using alcohol as the dispersion phase for testing;

[0088] 3. Slurry density: the standard requirement is 1.0-2.0 g / cm 3 , and the test process is as follows: a density cup with a fixed volume of 100 mL is used, the weight of the cup G1 g is measured, then the slurry is filled into the cup, the total weight of the cup and the slurry G2 g is measured, and the density is calculated as (G2-G1) / 100 g / cm 3 .

[0089] 4. The solid content of the slurry: the standard requirement is 50-70%, the test process is that a certain weight G3 g of the slurry is taken, then the slurry is baked in an oven at 180℃ for 20 min, and then the weight G4 g after baking is taken, the solid content = G4 / G3*100%.

[0090] Table 2

[0091]

[0092]

[0093] As can be seen from Table 2, the viscosity, the particle size, the density and the solid content of the ceramic slurry prepared by using the binder prepared by the application are all within the standard range.

[0094] Effect example

[0095] The binder prepared by the application is used to improve the adhesion of the green body. The specific process is that the slurry 1-21 is respectively cast to form a 10 μm film strip, the film strip is printed and laminated, then the laminated green body is hydrostatically pressed, dried, and then cut by using a 0.5 mm cutting knife, the cutting temperature is 75℃, the long axis is cut first, then the short axis is cut, and after cutting, the green body is cooled for 1 h, and the adhesion of the green body is observed; the green body adhesion rate is recorded, wherein the green body adhesion rate = the number of adhesion green bodies / the total number of green bodies*100%; the results are shown in Table 3; wherein the green body 1 is prepared by using the slurry 1, the green body 2 is prepared by using the slurry 2, and so on, and the green body 21 is prepared by using the slurry 21.

[0096] Table 3

[0097] green body adhesion rate / % green body adhesion rate / % green body adhesion rate / % green body 1 0.5 green body 8 0 green body 13 5.5 green body 2 0.7 green body 9 0.4 green body 14 8.2 green body 3 1.2 green body 10 1.2 green body 15 6.6 green body 4 1.2 green body 11 1.5 green body 16 5 green body 5 1.8 green body 12 1.9 green body 17 4.6 green body 6 0.5 green body 21 1.2 green body 18 4.5 green body 7 0.1 green body 19 48 green body 20 36

[0098] As can be seen from Table 3, when the binder prepared by the preparation method of the application is used in the green body cutting process in the subsequent preparation process of the multilayer ceramic capacitor, the cutting adhesion problem can be effectively improved, specifically, the adhesion rate is below 1.9%, and even the adhesion rate can be 0%. As can be seen from the green body 1-12 and the green body 19-20, compared with the straight-chain PVB in the prior art, the branched-chain PVB molecules with similar molecular weight can significantly reduce the adhesion rate, from 36-48% to below 1%.

[0099] As can be seen from the green body 1-12 and the green body 13-18, the values of m and n, the values of X, Y and Z, and the molecular weight of the PVB in the binder all affect the subsequent adhesion rate. As can be seen from the green body 8 and the green body 21, when the mass percentage of the binder in the slurry is 8-10%, the adhesion problem of the green body can be better improved.

[0100] It should be pointed out finally that the above embodiments are used to illustrate the technical solutions of the present application but not to limit the protection scope of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A binder for a ceramic green body, characterized by, The molecular structure of the ceramic green body adhesive is shown as Formula I: Formula I Wherein, A is selected from any one of Formula II, Formula III, Formula IV, B is selected from any one of Formula V, Formula VI, Formula VII, and C is selected from any one of Formula VIII, Formula IX, and Formula X; ； In the ceramic green body adhesive, a-c are satisfied: a. The molecular weight of A accounts for 1-4% of the total molecular weight of Formula I, the molecular weight of B accounts for 1-5% of the total molecular weight of Formula I, and the molecular weight of C accounts for 91-98% of the total molecular weight of Formula I; b. The molecular weight of m accounts for 0.08-4.5% of the total molecular weight of Formula I, and the molecular weight of n accounts for 95.50-99.92% of the total molecular weight of Formula I; c. The number average molecular weight of the ceramic green body adhesive is 60-80 kDal.

2. The ceramic green body binder according to claim 1, wherein, In the ceramic green body adhesive, at least one of d-f is satisfied: d. The molecular weight of A accounts for 2-4% of the total molecular weight of Formula I, the molecular weight of B accounts for 1-5% of the total molecular weight of Formula I, and the molecular weight of C accounts for 91-97% of the total molecular weight of Formula I; e. The molecular weight of m accounts for 0.1-0.8% of the total molecular weight of Formula I, and the molecular weight of n accounts for 99.20-99.90% of the total molecular weight of Formula I; f. The number average molecular weight of the ceramic green body adhesive is 68-73 kDal.

3. The method of producing a binder for a ceramic green body according to any one of claims 1 to 2, characterized in that, The preparation method comprises the following steps: (1) mixing vinyl acetate and a cyclic branched monomer to perform a polymerization reaction to obtain a branched polyvinyl acetate; (2) alcoholysis of the branched polyvinyl acetate to obtain a branched polyvinyl alcohol; (3) mixing the branched polyvinyl alcohol and butyraldehyde to perform a polycondensation reaction, cooling after the polycondensation reaction, and adjusting the pH value of the system to 5.5-6.5, collecting the precipitated solid, and washing and drying to obtain the ceramic green body adhesive; The structure of the cyclic branched monomer is shown as Formula XI, Formula XI, Wherein, R is selected from any one of the structures shown as (i)-(iii), 。 4. The production method according to claim 3, characterized by, In the step (2), the branched content of the branched polyvinyl acetate is 0.1-0.5%; And / or, in the reaction system for alcoholysis of branched polyvinyl acetate, the mass concentration of branched polyvinyl acetate is 20-40%, H + The concentration is 0.5-2 mol / L; And / or, the alcoholysis temperature is 40-50°C, and the alcoholysis time is 3-12h.

5. The preparation method according to claim 3, characterized in that, In the step (3), the mass concentration of butyraldehyde in the polycondensation reaction system is 10-30%, H + The concentration is 1-2 mol / L. And / or, the polycondensation reaction temperature is 35-45°C, and the polycondensation reaction time is 4-8h.

6. A ceramic slurry, characterized by, The ceramic slurry comprises the ceramic green body adhesive according to any one of claims 1-2.

7. The ceramic slurry of claim 6, wherein, The ceramic slurry further comprises a ceramic powder, a dispersant, a solvent, and a functional additive.

8. A ceramic green body, characterized by, The ceramic green body is prepared using the ceramic slurry according to claim 6 or 7.

9. A multilayer ceramic capacitor characterized by The multilayer ceramic capacitor is prepared using the ceramic green body according to claim 8.

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