JPH0826832A - Method for producing slurry for ceramics green sheet - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a method for producing a slurry for ceramic green sheets, which is capable of producing a slurry in which there is no lump and which is uniformly dispersed. [Structure] Dispersing ceramic powder uniformly in a solvent Then, a ceramics slurry is manufactured. Separately from this, the binder is uniformly dissolved in a solvent to produce a binder liquid. As described above, since they are separately dispersed and dissolved in the solvent, they are uniformly dissolved. Furthermore, by adding a plasticizer to the binder liquid, stirring and mixing uniformly,
A binder plasticizer mixed solution in which the entanglement of the binder is sufficiently loosened is produced. Then, the binder plasticizer mixed liquid thus produced is mixed with the ceramics slurry to produce a slurry. Since both of them are liquid, they are easily mixed and uniformly mixed throughout.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a slurry for ceramic green sheets, and more specifically to an improvement in a process for producing a slurry in which respective materials are mixed.

[0002]

2. Description of the Related Art As a conventional method for producing a ceramic green sheet, as shown in FIG. 5, ceramic powder is filled with a powdery binder, a plasticizer, a solvent, a dispersant and the like in a stirring means such as a ball mill. Then, a slurry is produced by simultaneously stirring and mixing them. Then, the slurry thus produced is formed into a sheet having a predetermined thickness by a doctor blade method or the like, and then heated and dried to produce a green sheet.

[0003]

However, in the above-mentioned conventional method for producing a slurry, the respective materials cannot be uniformly mixed at the time of mixing, and lumps sometimes occur. Then, a uniformly dispersed slurry could not be obtained, and thus a high quality green sheet could not be manufactured. That is, when the sheet is formed into a sheet shape, not only the tensile strength and the adhesive strength of the sheet are not sufficiently obtained, but also the shrinkage ratio when laminated and baked is partially different, so that the dimensional accuracy cannot be sufficiently obtained. Occurs. This is noticeable when a binder having a high polymerization degree is mixed.

Further, in such a conventional manufacturing method, since it was difficult to mix the respective materials uniformly, it takes a long time to stir and mix, resulting in poor manufacturing efficiency. Could not be made even.

The present invention has been made in view of the above background, and an object of the present invention is to solve the above-mentioned various problems and produce a slurry having no lumps and uniformly dispersed in a short time. An object of the present invention is to provide a method for producing a ceramic green sheet slurry that can be used.

[0006]

In order to achieve the above object, in the method for producing a slurry for ceramic green sheets according to the present invention, ceramic powder is uniformly dispersed in a solvent to produce a ceramic slurry. Separately from the production of the slurry, a binder is uniformly dissolved in a solvent to produce a binder solution, and then a plasticizer is added to and mixed with the binder solution to produce a binder plasticizer mixed solution, and then the binder plasticizer. The mixed solution and the ceramics slurry are mixed (claim 1).

As another method, a ceramics slurry having a predetermined particle diameter is wet pulverized with a solvent to obtain an undried state to produce a ceramics slurry, and a binder is used as a solvent separately from the production of the ceramics slurry. To prepare a binder liquid, and then add and mix a plasticizer to the binder liquid to prepare a binder plasticizer mixed liquid, and then mix the binder plasticizer mixed liquid and the ceramics slurry. You may do so (Claim 2).

Preferably, when a plurality of binders are used, each binder is dissolved in a solvent and mixed with a plasticizer to produce one binder / plasticizer mixed liquid, which is used as a ceramic slurry. It is to mix (Claim 3). When a plurality of binders are used as described above, the plasticizer is also added for each binder liquid. That is, it is more preferable that a plasticizer is added to and mixed with each binder liquid to produce a plurality of binder / plasticizer mixed liquids, which are mixed with the ceramics slurry (claim 4).

Further, when the solvent mixed with the ceramic powder and the solvent mixed with the binder are different,
It is desirable to use a solvent having the same functional group in part or the same solvent (Claim 5). Furthermore, it is more preferable that a dispersant is mixed in at least one of when the ceramics slurry is produced and when the binder liquid is produced (claim 6).

[0010]

In the inventions of claims 1 and 2, since the ceramic powder and the binder are separately dispersed and mixed in the solvent, both are uniformly mixed. Further, by adding a plasticizer to the obtained binder liquid, a binder plasticizer mixed liquid in which the entanglement of the binder is sufficiently loosened is produced, and, in general, the amount of the plasticizer added is very small, By adding to the binder liquid to be mixed, it surely acts (unravels) on the binder.
Next, the binder plasticizer mixed liquid and the ceramics slurry obtained respectively are mixed to produce a slurry,
Both of these mixtures are liquid, and since the binder is sufficiently loosened by the addition of the plasticizer in the previous step, the two are easy to mix and uniformly mixed throughout. Therefore, a slurry having no lump and uniformly dispersed is produced. Further, since it is easy to mix uniformly in this way, a high quality slurry can be produced in a short time.

According to the third aspect of the present invention, when a plurality of binders are used, each binder is dissolved in a solvent to produce a binder solution, which is mixed to produce a final binder solution. Then, after mixing the binder liquid and the plasticizer, the ceramics slurry is mixed to produce a slurry. Since a plurality of binders are also mixed in the binder liquid, they are uniformly mixed.

According to the fourth aspect of the invention, when a plurality of binders are used as described above, the addition and mixing of the plasticizers are separately performed, and a number of binder plasticizer mixed liquids corresponding to the number of binders are manufactured. Then, since the binder in the binder plasticizer mixed liquid is sufficiently loosened by the plasticizer, even if the respective mixed liquids and the ceramics slurry are mixed, a short time (claim 3
(Compared with (1)) produces a uniformly dispersed slurry.

Further, when a plurality of solvents are used (Claim 5), when the ceramics and the binder are melted and dispersed by using the same solvent, the solvent constituting the ceramics slurry and the binder-plasticizer mixed liquid are constituted. Due to the similar nature of the solvent used, it mixes more uniformly and produces a high quality slurry.

Further, when a ceramic slurry and / or a binder liquid are produced, a dispersant is mixed with a solvent and stirred (claim 6), whereby each particle of the ceramic powder / binder is further dispersed, and the final product is obtained. When the slurry is manufactured, it is dispersed uniformly without lumps.
Mixed.

[0015]

The preferred embodiments of the method for producing a slurry for ceramic green sheets according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 shows a manufacturing process chart of a first embodiment of a slurry manufacturing method according to the present invention.

As shown in the figure, first, ceramic powder is uniformly dispersed in a solvent to produce a ceramic slurry. Separately from this, a binder is uniformly dissolved in a solvent to produce a binder liquid. Further, a plasticizer is added to the melted binder liquid, and the mixture is stirred and uniformly mixed to produce a binder plasticizer mixed liquid. Then, a slurry is manufactured by mixing the binder plasticizer mixed liquid thus manufactured and the ceramics slurry.

That is, according to the above method, since the ceramics are in the form of slurry (suspension) and the binder is also in the form of solution (liquid), both have good fluidity and are easily mixed uniformly. Furthermore, since the plasticizer is added to the binder solution before mixing the both, the entanglement of the binder is loosened. Therefore, the binder and the ceramic particles are easily mixed with each other, so that they are more uniformly dispersed.

Dispersing the ceramic powder simple substance in the solvent or dissolving the binder simple substance in the solvent requires a small amount to be added to the solvent and each is a single type, so that it is relatively easy and uniform to the solvent. It can be dispersed and dissolved. Therefore, the slurry manufactured by the above manufacturing process is a lump-free and uniformly dispersed slurry.

Next, an experiment was conducted to verify the effect of the above-mentioned embodiment. The results are shown below. This experiment was obtained by trial and error in devising the present invention and the manufacturing method of the present invention described above (developed while the invention was completed).
5 of the manufacturing method (Comparative Examples 1 to 3) and the conventional method shown in FIG.
Each slurry was manufactured by various kinds of manufacturing methods, and each manufacturing method was evaluated by verifying the state of the manufactured slurry.

First, a BaO--Nd ₂ O ₃ --TiO ₂ system having an average particle size of 0.5 μm was used as the ceramic powder, and 17.5 parts by weight of the binder was added to 100 parts by weight of the ceramic powder. Polyvinyl butyral (PVB) powder was used, 11 parts by weight of dibutyl phthalate (DBP) was used as a plasticizer, and 150 parts by weight of ethyl alcohol was used as a solvent. In the above 5 methods,
Although the specific manufacturing process was changed, the materials used and their compounding ratios were all the same.

Next, each manufacturing method used in the experiment will be described. First, in the present invention, ceramic powder is dispersed in a solvent for 10 h by a ball mill to produce a ceramic slurry. On the other hand, after a binder was dissolved in a solvent to produce a binder solution, a plasticizer was further added to and mixed with the binder solution to produce a binder plasticizer mixed solution. Then, the binder plasticizer mixed liquid was mixed with the ceramics slurry for 20 hours in a ball mill.

In Comparative Example 1, as shown in FIG. 2, the ceramic powder and the binder are mixed for 10 hours to produce a mixed powder. Next, the mixed powder, the plasticizer and the solvent were simultaneously mixed and mixed for 20 hours.

In Comparative Example 2, as shown in FIG. 3, the ceramic powder is dispersed in a solvent for 10 h by a ball mill to produce a ceramic slurry. The ceramic slurry, the binder and the plasticizer were simultaneously mixed and mixed for 20 hours.

In Comparative Example 3, as shown in FIG. 4, the ceramic powder is dispersed in a solvent for 10 h in a ball mill to produce a ceramic slurry. Meanwhile, a binder solution is manufactured by dissolving a binder in a solvent. Then, the ceramic slurry prepared above, the binder solution and the plasticizer were simultaneously mixed and mixed for 20 hours.

In the conventional example, as shown in FIG. 5, the above materials were simultaneously mixed and mixed in a ball mill for 30 hours.

Then, the dispersion state of the slurry produced by each of the above-mentioned methods was examined by using a grind gauge, and the results are shown in the following table.

[0027]

[Table 1] As is clear from the above table, the method of the present invention gave the best dispersion. When each manufacturing process of the present invention is examined based on the above table, in the case of the conventional example and the comparative example 1, the grind cage value is much larger than the others, and many lumps appear. That is, in the conventional example, the ceramic powder and the binder are simultaneously mixed with the solvent and the plasticizer. Therefore, it is considered that when these ingredients are simultaneously mixed in this manner, the respective materials are not sufficiently dispersed, and as a result, lumps are formed. Therefore, by mixing the ceramic powder and the solvent as in the present invention to form the ceramic slurry, the ceramic powder is uniformly dispersed in the solvent.

When Comparative Example 2 is compared with Comparative Example 3 and the present invention, the former has a small lump with a grind gauge value of 3 μm. From this result, it can be said that the ceramic and the binder are more uniformly dispersed and mixed by producing the binder liquid by mixing the binder with the solvent in advance as in the present invention.

Further, comparing Comparative Example 3 with the present invention, both of the grind gauge values are 0, but the dispersion state of the slurry in Comparative Example 3 is worse (non-uniform). Therefore,
Comparing both manufacturing processes, the present invention shows that a plasticizer is added to the binder liquid before mixing with the ceramic slurry.
On the other hand, in Comparative Example 3, the ceramics slurry, the binder liquid, and the plasticizer are mixed at the same time. That is, the way of adding the plasticizer is different, but since the amount of the plasticizer added is originally small, when the three are blended at the same time as in Comparative Example 3, the plasticizer is uniformly mixed throughout. This is because the entanglement of the binder cannot be sufficiently loosened. Therefore, in each manufacturing process of the present invention, each material can be uniformly mixed due to the various factors described above.

In the above experiment, one kind of polyvinyl butyral powder was used as the binder, but the same result can be obtained by using a plurality of binders. That is,
The manufacturing process is as shown in FIG. 6, which is the second embodiment of the present invention. As shown,
As in the example, the ceramic powder is uniformly dispersed in the solvent to produce a ceramic slurry. Separately, a binder is uniformly dissolved in a solvent to produce a binder solution. At this time, since a plurality of binders are used,
Each binder is melted with a solvent to produce a plurality of binder solutions. Then, by mixing each binder liquid, adding a plasticizer and stirring, and by uniformly mixing,
A binder / plasticizer mixture is manufactured. Then, a slurry is manufactured by mixing the binder plasticizer mixed liquid thus manufactured and the ceramics slurry.

Next, an experiment was conducted to verify the effect of the above-mentioned embodiment. The results are shown below. First, in the product of the present invention (second embodiment), a BaO—Nd ₂ O ₃ —TiO ₂ system having an average particle size of 0.5 μm was used as the ceramic powder, and 100 parts by weight of the ceramic powder was used. Polyvinyl butyral (PVB) powder polymerization degree 800 of 16.5 parts by weight and PVB powder polymerization degree 1750 of 1 part by weight are used as a binder, 11 parts by weight of dibutyl phthalate (DBP) is used as a plasticizer, and 150 parts by weight of a solvent. Some ethyl alcohol was used.

Then, a plurality of binder solutions obtained by dissolving each binder in 80 parts by weight of the solvent and 20 parts by weight of the solvent are mixed with a plasticizer and stirred for 20 hours (hours) to produce a binder plasticizer mixed solution. did. Then, it was further mixed with a ceramics slurry produced by the same method as in the first example to produce a slurry.

The materials used and their compounding ratios were the same in the method of this embodiment (FIG. 6), and the above-mentioned comparative examples shown in FIGS. A slurry was produced. In the manufacturing process of each of the comparative example and the conventional example, the binder in each drawing is replaced with a plurality of binders.

That is, in the case of the conventional method (FIG. 5), all materials including a plurality of binders were simultaneously mixed and mixed for 30 hours. Further, Comparative Example 4 is based on the process of FIG. 2, and the ceramic powder and the plurality of binders are simultaneously applied for 10 hours.
After mixing, a plasticizer and a solvent were added and the mixture was further mixed for 20 hours.

Comparative Example 5 is based on the process shown in FIG.
Disperse with ceramic powder and solvent (mix for 10 h),
Then, each binder and a plasticizer were mixed and mixed for 20 hours.

Comparative Example 6 is based on the method shown in FIG.
A plurality of binders were simultaneously dissolved in a solvent to produce a binder liquid, and then the binder liquid, a plasticizer, and a ceramics slurry were mixed and mixed for 20 hours.

As a result, as shown in the table below, even when a plurality of binders (PVB having a polymerization degree of 800 and 1700) were used, only a single binder (PVB having a polymerization degree of 800) was used (FIG. The same tendency as in FIG. 5 and Table 1) was obtained, and in any of the examples using the method of the present invention (first and second examples), it was possible to produce a slurry with no lumps and uniform dispersion.

[0038]

[Table 2] FIG. 7 shows a third embodiment of the present invention. In this example, a plurality of binders are used in the same manner as in the second embodiment described above. Each binder is separately dissolved in a solvent to produce a binder solution, and then a plasticizer is added to each binder solution. Binder plasticizer mixed liquids are manufactured by adding the respective binders. Then, a plurality of binder plasticizer mixed liquids thus produced and a ceramics slurry (produced by dispersing ceramics powder by using a solvent as in each example) are mixed and mixed to produce a slurry. ing.

Then, in order to verify the effect of this embodiment,
As in the second embodiment, as the ceramic powder, a BaO—Nd ₂ O ₃ —TiO ₂ system having an average particle size of 0.5 μm was used, and 100 parts by weight of the ceramic powder was polyvinyl butyral (as a binder). PVB powder polymerization degree 800 is 16.5 parts by weight, PVB powder polymerization degree 1750 is 1 part by weight, 11 parts by weight of dibutyl phthalate (DBP) is used as a plasticizer, and 150 parts by weight of ethyl alcohol is used as a solvent. Experiments were conducted using

That is, each binder is dissolved in 80 parts by weight of a solvent and 20 parts by weight of a solvent to produce a plurality of binder solutions, and the above-mentioned plasticizers are added to each binder solution and mixed to obtain the binder plasticizers. A mixture was prepared. After that, the ceramics slurry produced by the same method as in the first example was further mixed with the plurality of binder plasticizer mixed liquids to produce a slurry.

Also in this embodiment, the produced slurry has a ground gauge value of 0 and the dispersion state of the slurry is good, as in the first and second embodiments, and a high quality slurry similar to each embodiment is obtained. Was manufactured. Further, in this embodiment, the mixing time for producing the slurry can be shortened to about 1/3 of that of the second embodiment (mixing time required to obtain the same quality). It was confirmed that productivity was improved.

On the other hand, in the second and third embodiments, an example using a plurality of binders has been described. However, in the present invention, a plurality of solvents are also used (a solvent for mixing with ceramic powder and a solvent for dissolving the binder). Is not a perfect match). In that case, preferably, ceramics slurry or binder liquid (binder
A common solvent or a solvent having the same functional group is used as a part of the plasticizer mixture). By doing so, a uniform slurry can be obtained in a shorter time. That is, when the same or the same quality (similar) solvent is used, the solvents are easily mixed together when the ceramics slurry and the binder / plasticizer mixed liquid are finally mixed.

In order to demonstrate the effect of the above modification, a slurry was manufactured using the four kinds of manufacturing methods of the present invention (Modifications 1 to 3) and Comparative Example 7 shown below, and the slurry was evaluated. . As a basic manufacturing method, the manufacturing method shown in FIG. 1 was used, and the solvent used was appropriately changed.

That is, specifically, first, as a ceramic powder, BaO--Nd ₂ O ₃ --having an average particle size of 0.5 μm was used.
A ceramic powder 100 made of TiO ₂ is used.
To 1 part by weight, 17.5 parts by weight of polyvinyl butyral (PVB) powder is used as a binder and 1 as a plasticizer.
1 part by weight of dibutyl phthalate (DBP) is used. Then, the ceramic powder is dispersed in 50 parts by weight of the solvent by a ball mill for 10 hours to produce a ceramic slurry. On the other hand, a binder liquid dissolved in 100 parts by weight and a plasticizer were mixed to produce a binder plasticizer mixed liquid. Then, the binder plasticizer mixed liquid was mixed with the ceramics slurry for 20 hours in a ball mill. This basic manufacturing method was the same, and the solvent used was appropriately changed as shown below.

Present Invention (Modification 1) The solvent of the ceramic slurry is ethyl alcohol and the solvent of the binder liquid is n-butyl alcohol. The present invention (Modification 2) The solvent of the ceramic slurry is ethyl alcohol 20 parts by weight and n-butyl alcohol 30. By weight, the solvent of the binder liquid is n-butyl alcohol. The present invention (Modification 3) The solvent of the ceramic slurry is 20 parts by weight of ethyl alcohol and 30 parts by weight of n-butyl alcohol, and the solvent of the binder liquid is 40 parts by weight of ethyl alcohol. And n-butyl alcohol 60 parts by weight Comparative Example 7 The solvent of the ceramics slurry is ethyl alcohol, the solvent of the binder liquid is toluene, and the dispersion state of the slurry produced by each of the above methods was examined by using a grind gauge. As shown in the table.

[0046]

[Table 3] As is clear from the above table, in the present invention (modifications 1 to 3) using a homogeneous solvent, a slurry having no lumps and a uniform dispersion state was obtained, but a comparative example using a solvent having different properties. It was confirmed that the slurry produced by the method of 7 had lumps and the dispersion state of the slurry was non-uniform.

Further, in the present invention, wet pulverized one may be used as the ceramic powder, and in such a case, the solvent for pulverization and the solvent for producing the slurry are the same or a mixed solvent containing the solvent for pulverization. Since the crushed powder can be made into a slurry without being dried, it is easy to obtain the effect of crushing the ceramic powder without agglomeration.

That is, by using one in which the binder is dissolved or swollen in the solvent and one in which the plasticizer is dissolved, the wet-ground ceramics slurry is used as it is without drying, and the undried ceramics slurry is used as the binder. A slurry for a green sheet is manufactured by adding a plasticizer to a binder solution prepared by dissolving in a mixture with a binder-plasticizer mixed solution obtained.

Next, an experiment was conducted to verify the effect of the above-mentioned embodiment. The results are shown below. Similar to the experiment of the first embodiment described above, each of the manufacturing methods was evaluated by manufacturing the slurry by 5 kinds of manufacturing methods and verifying the state of the manufactured slurry.

First, BaO-Nd ₂ having an average particle size of 2 μm is used.
17. As a binder to 100 parts by weight of the ceramic powder obtained by pulverizing the O ₃ —TiO ₂ -based ceramic powder with a medium stirring mill to an average particle size of about 0.5 μm.
5 parts by weight of PVB powder was used, 11 parts by weight of DBP was used as a plasticizer, and 150 parts by weight of ethyl alcohol was used as a solvent.

In the following five methods, the specific manufacturing steps were changed, but the materials used and their compounding ratios were all the same. Further, in the conventional example and the comparative example 1, after the ceramic powder having an average particle diameter of 2 μm was wet pulverized,
By drying, a ceramic powder having an average particle size of 0.5 μm was formed, but other than that, no drying treatment was performed. The PVB powder used as the binder has a degree of polymerization of 8
00 alone and two kinds of binders (polymerization degrees of 800 and 1700) as in the above modification were tested.

Next, each manufacturing method used in the experiment will be described. First, in the conventional example, as shown in FIG. 12, an average particle size of 0.5 μm obtained by wet pulverizing with a solvent and then drying.
The above ceramic powder, the binder, the plasticizer and the solvent were simultaneously mixed and mixed in a ball mill for 30 hours.

In Comparative Example 8, as shown in FIG. 9, a ceramic powder having an average particle size of 0.5 μm obtained by wet pulverization using a solvent and drying was mixed with a binder for 10 hours to produce a mixed powder. . Next, the mixed powder, the plasticizer and the solvent were simultaneously mixed and mixed for 20 hours.

In Comparative Example 9, as shown in FIG. 10, a ceramic powder having a particle diameter of 2 μm was wet-milled using the above solvent to obtain a ceramic slurry in which the ceramic powder having a particle diameter of 0.5 μm was dispersed. To manufacture. That is, the ceramic slurry can be produced at the same time by wet pulverizing the solvent used for wet pulverization with the same solvent as used for producing the ceramic slurry. Then, the ceramic slurry, the binder and the plasticizer were simultaneously mixed and mixed for 20 hours.

In Comparative Example 10, as shown in FIG. 11, the ceramic slurry obtained by wet pulverization and the binder solution obtained by dissolving the binder in 100 parts by weight of the solvent were plasticized in the same manner as in Comparative Example 9 above. The agents were mixed at the same time and mixed for 20 hours.

In the present invention (Example 4), as shown in FIG. 8, a ceramics slurry is manufactured by wet pulverizing the ceramics powder with a predetermined solvent as in Comparative Examples 9 and 10. On the other hand, a binder was dissolved in 100 parts by weight of a solvent to prepare a binder solution, and then a plasticizer was added to and mixed with the binder solution to prepare a binder plasticizer mixed liquid. Then, the binder plasticizer mixed liquid and the ceramics slurry are put in a ball mill for 20 hours.
Mixed.

Then, the dispersion state of the slurry produced by each of the above-mentioned methods was examined by using a grind gauge, and the results are shown in the following table. In addition, the manufacturing process of each of Comparative Examples 8 to 10 in the case of a plurality of binder solutions was performed according to the process of each of the above Comparative Examples using a mixture of a plurality of binders, and only the one corresponding to Example 4 was used. , Each binder was mixed with a solvent to prepare a plurality of binder solutions.

[0058]

[Table 4] As is clear from the above table, the method of the present invention gave the best dispersion. Further, in such a method, since the drying process is not required and the wet pulverization and the production of the ceramics slurry can be performed in one step, the processing time can be further shortened due to the simplification of the processing step.

Further, even when a plurality of binders and solvents were used as in the above-mentioned modified example, the slurry with the best dispersion state was obtained in the manufacturing method shown in FIG.

FIG. 13 shows a fifth embodiment of the present invention. In this example, based on the above-described first example, an appropriate amount of a dispersant was added to each of the ceramic powder to be dispersed in the solvent and the binder to be dissolved in the solvent, and each treatment was performed. .

As described above, by adding an appropriate amount of the dispersant each time, the ceramics slurry and the binder liquid are more uniformly dispersed, and as a result, the uniformity of the finally manufactured slurry is further improved. In addition, since the uniformly dispersed substances are mixed with each other, the mixing can be performed in a shorter time.

The addition of the dispersant in this way is
Of course, it can be applied to each of the above-described embodiments.

[0063]

As described above, in the method for producing a slurry for ceramic green sheets according to the present invention, the ceramic powder and the binder are separately dispersed / dissolved in the solvent to uniformly disperse / dissolve each. be able to. Moreover, by further adding a plasticizer to the obtained binder liquid, a binder plasticizer mixed liquid in which the entanglement of the binder is sufficiently loosened can be manufactured. Next, the obtained binder plasticizer mixed liquid and the ceramics slurry are mixed to produce a slurry. Since both of these mixtures are liquid, they can be easily mixed and uniformly mixed. Therefore, it is possible to produce a slurry which is free from lumps and which is uniformly dispersed.
Moreover, since it is easy to mix uniformly, it is possible to produce a high-quality slurry by stirring for a short time.

When the ceramic powder is produced by wet pulverization (claim 2), the solvent used in the wet pulverization is the solvent used in producing the slurry, whereby the pulverization treatment and the production of the ceramic slurry are carried out. The steps can be standardized, and the steps can be reduced and the time can be shortened.

When a plurality of binders are used (claim 3), each binder is dissolved in a solvent to produce a binder solution, and after mixing each binder solution with a plasticizer,
A ceramic slurry is mixed to produce a slurry. Since a plurality of binders are also mixed with each other, the binder liquids can be mixed uniformly.

At this time, when the plasticizer is added for each binder to prepare a plurality of binder plasticizer mixed liquids, and the binder plasticizer mixed liquids and the ceramics slurry are mixed and stirred, (Claim 4) Since the binder liquid itself is sufficiently loosened by adding the plasticizer to each binder liquid, the binders can be agitated and mixed in a shorter time than in the above-mentioned claim 3, and as a result, uniform. It becomes possible to manufacture the slurry in a shorter time.

When a plurality of solvents are used (Claim 5), when the ceramics and the binder are dispersed and dissolved in the same solvent, the solvent forming the ceramics slurry and the binder-plasticizer mixed liquid are formed. Due to the similar nature of the solvent used, more uniform mixing and higher quality slurry can be produced.

Further, when the ceramic slurry and / or the binder liquid is produced, the dispersant is mixed with the solvent and stirred (claim 6), whereby the ceramic powder / binder particles are further dispersed, and When the slurry is manufactured, it is dispersed uniformly without lumps.
Mixed.

[Brief description of drawings]

FIG. 1 is a manufacturing process diagram illustrating a first embodiment of a method for manufacturing a ceramic green sheet slurry according to the present invention.

FIG. 2 is a diagram illustrating a manufacturing method of Comparative Example 1.

FIG. 3 is a diagram illustrating a manufacturing method of Comparative Example 2.

FIG. 4 is a diagram illustrating a manufacturing method of Comparative Example 3;

FIG. 5 is a diagram illustrating a conventional manufacturing method.

FIG. 6 is a manufacturing process diagram illustrating a second embodiment of a method for manufacturing a slurry for ceramic green sheets according to the present invention.

FIG. 7 is a manufacturing process diagram illustrating a third embodiment of the method for manufacturing a ceramic green sheet slurry according to the present invention.

FIG. 8 is a manufacturing process diagram illustrating a fourth embodiment of the method for manufacturing a ceramic green sheet slurry according to the present invention.

FIG. 9 is a diagram illustrating a manufacturing method of Comparative Example 8.

FIG. 10 is a diagram illustrating a manufacturing method of Comparative Example 9.

FIG. 11 is a diagram illustrating a manufacturing method of Comparative Example 10.

FIG. 12 is a diagram illustrating a conventional manufacturing method.

FIG. 13 is a manufacturing process diagram illustrating a fifth embodiment of a method for manufacturing a slurry for ceramic green sheets according to the present invention.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuaki Endo 5-36-11 Shimbashi, Minato-ku, Tokyo Fuji Electric Chemical Co., Ltd.

Claims (6)

[Claims] 1. A ceramic powder is uniformly dispersed in a solvent to produce a ceramic slurry, and separately from the production of the ceramic slurry, a binder is uniformly dissolved in the solvent to produce a binder solution, and then the binder solution is prepared. A method for producing a slurry for a ceramic green sheet, which comprises adding and mixing a plasticizer to prepare a binder plasticizer mixture, and then mixing the binder plasticizer mixture and the ceramics slurry. 2. A ceramics slurry is produced by wet pulverizing a ceramics powder having a predetermined particle size with a solvent and making it undried, and separately from the production of the ceramics slurry, a binder is uniformly dissolved in the solvent. To produce a binder liquid, and then to add and mix a plasticizer to the binder liquid to produce a binder plasticizer mixed liquid, and then to mix the binder plasticizer mixed liquid and the ceramics slurry with ceramic green A method for producing a slurry for a sheet. 3. When a plurality of the binders are used, each binder is dissolved in a different solvent to produce a plurality of binder solutions, and the plurality of binder solutions and the plasticizer are added and mixed to obtain the binder solution. The method for producing a ceramic green sheet slurry according to claim 1, wherein a binder plasticizer mixed liquid is produced. 4. When a plurality of binders are used, each binder is dissolved in a different solvent to produce a plurality of binder liquids, and a plasticizer is added to each binder liquid to mix a plurality of binder plasticizers. The method for producing a ceramic green sheet slurry according to claim 1 or 2, wherein a liquid is produced. 5. The solvent having the same functional group or the same solvent is partially used when the solvent mixed with the ceramic powder and the solvent mixed with the binder are different from each other. A method for producing a slurry for ceramic green sheets according to any one of 1. 6. The ceramic green sheet according to any one of claims 1 to 5, wherein a dispersant is mixed in at least one of when producing the ceramic slurry and when producing the binder liquid. Method for producing slurry.