JPS62191458A - Manufacture of ceramic formed body - Google Patents
Manufacture of ceramic formed bodyInfo
- Publication number
- JPS62191458A JPS62191458A JP61033639A JP3363986A JPS62191458A JP S62191458 A JPS62191458 A JP S62191458A JP 61033639 A JP61033639 A JP 61033639A JP 3363986 A JP3363986 A JP 3363986A JP S62191458 A JPS62191458 A JP S62191458A
- Authority
- JP
- Japan
- Prior art keywords
- binder
- mold
- molded body
- weight
- parts
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000919 ceramic Substances 0.000 title claims description 30
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 239000002002 slurry Substances 0.000 claims description 28
- 229920002689 polyvinyl acetate Polymers 0.000 claims description 17
- 239000011118 polyvinyl acetate Substances 0.000 claims description 17
- 238000006116 polymerization reaction Methods 0.000 claims description 14
- 238000007127 saponification reaction Methods 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 8
- 238000005266 casting Methods 0.000 claims description 5
- 239000011230 binding agent Substances 0.000 description 29
- 238000000034 method Methods 0.000 description 12
- 238000000465 moulding Methods 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 8
- 230000018044 dehydration Effects 0.000 description 7
- 238000006297 dehydration reaction Methods 0.000 description 7
- 239000011347 resin Substances 0.000 description 7
- 229920005989 resin Polymers 0.000 description 7
- 238000001035 drying Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000005336 cracking Methods 0.000 description 5
- 239000011505 plaster Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- 229920002472 Starch Polymers 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 235000019698 starch Nutrition 0.000 description 2
- 239000008107 starch Substances 0.000 description 2
- KTIBRDNFZLYLNA-UHFFFAOYSA-N 2-(2-hydroxyethenoxy)ethenol Chemical compound OC=COC=CO KTIBRDNFZLYLNA-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- -1 alkyl vinyl ether Chemical compound 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 150000002334 glycols Chemical class 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- HVAMZGADVCBITI-UHFFFAOYSA-M pent-4-enoate Chemical compound [O-]C(=O)CCC=C HVAMZGADVCBITI-UHFFFAOYSA-M 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 229920005646 polycarboxylate Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- UKRDPEFKFJNXQM-UHFFFAOYSA-N vinylsilane Chemical compound [SiH3]C=C UKRDPEFKFJNXQM-UHFFFAOYSA-N 0.000 description 1
- 239000003232 water-soluble binding agent Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、鋳込み成形により、セラミックス成形体を製
造する方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of manufacturing a ceramic molded body by casting.
（従来の技術）
従来、セラミックス成形体を製造するには種々の方法が
採用されている。鋳込み成形もその中の一つで９セラミ
ツクス原料とバインダーとを含む水性スラリーを石膏型
等の多孔体の型に流し込み。(Prior Art) Conventionally, various methods have been adopted for manufacturing ceramic molded bodies. Cast molding is one such method, in which an aqueous slurry containing 9 ceramic raw materials and a binder is poured into a porous mold such as a plaster mold.
脱水成形した後、型から脱着し乾燥することによりセラ
ミックス成形体とする方法である。In this method, after dehydration molding, a ceramic molded body is obtained by removing it from the mold and drying it.
鋳込み成形は、伝統的なセラミックス成形方法であり、
古くから行われていた。しかし、他の成形方法に比べ生
産性や成形体の寸法精度が劣るため、ファインセラミッ
クスの分野ではあまり採用されていなかった。ところが
、スラリーを流し込む多孔体の型さえあれば、高価な設
備や機器を必要とせず、しかも、複雑な形状のものや大
型の製品が製造できることから、ファインセラミックス
の分野においてもこの方法が見直されるようになり、今
後、大きな伸びが期待される成形方法といえる。Casting is a traditional method of forming ceramics.
It has been practiced since ancient times. However, it has not been widely adopted in the field of fine ceramics because it is inferior in productivity and dimensional accuracy of molded bodies compared to other molding methods. However, as long as there is a porous mold into which the slurry is poured, there is no need for expensive equipment or equipment, and it is possible to manufacture products with complex shapes or large sizes, so this method is being reconsidered in the field of fine ceramics. It can be said that this is a molding method that is expected to see significant growth in the future.
通常、鋳込み成形用のバインダーとしては、水溶性のポ
リビニルアルコール（以下ＰＶＡと略記する。）やデン
プンが使用されている。そして。Usually, water-soluble polyvinyl alcohol (hereinafter abbreviated as PVA) or starch is used as a binder for cast molding. and.
水性スラリーを多孔体の型に流し込んだときの脱水性が
、型からの脱着及び乾燥工程における作業性に大きな影
響を及ぼし、さらにセラミックス成形体の性能及び製品
歩留りを左右する。上記従来技術は、「セラミックス成
形用バインダー」 （経営開発センター出版部）に記載
の通りである。The ability to remove water when an aqueous slurry is poured into a porous mold has a great effect on the workability in the desorption and drying process, and also influences the performance and product yield of the ceramic molded body. The above-mentioned conventional technology is as described in "Binder for Ceramic Molding" (Management Development Center Publishing Department).
（発明が解決しようとする問題点）
しかしながら、このような従来法では、水溶性のバイン
ダーを使用していたので、水性スラリーを多孔体の型に
流し込んで鋳込み成形したとき。(Problems to be Solved by the Invention) However, in this conventional method, a water-soluble binder is used, so when the aqueous slurry is poured into a porous mold and cast-molded.
脱水と同時に型へバインダーが移動して、バインダーに
よる型の目詰りが起こり、スラリーの脱水速度が急激に
低下するため、成形時間が長くなり。The binder moves into the mold at the same time as dehydration, causing the mold to become clogged with the binder, causing a rapid drop in the dewatering speed of the slurry, resulting in a longer molding time.
型から脱着する際の離形性も悪くなるといった問題があ
った。さらに、バインダーの移動により。There was also a problem in that the mold releasability during detachment from the mold was also poor. Additionally, by moving the binder.
成形体内部におけるバインダーの分布が非常に不均一に
なるので、乾燥工程におけるそりやヒビ割れの原因とな
って、セラミックス成形体の性能及び製品歩留まりが低
下するといった問題があった。Since the distribution of the binder inside the molded body becomes extremely non-uniform, this causes warping and cracking during the drying process, resulting in a problem in that the performance and product yield of the ceramic molded body are reduced.
しかも、バインダーによる目詰まりのため、多孔体の型
の寿命が著しく低下するといった問題があった。Furthermore, there was a problem in that the life of the porous mold was significantly reduced due to clogging caused by the binder.
したがって本発明の目的は、セラミックス原料とバイン
ダーとを含む水性スラリーから、バインダーが型へ移動
せず、バインダーが、成形体内部へ均一に分布して、乾
燥工程においてそりやヒビ割れが発生せず、また強度の
高いセラミックス成形体を効率良く製造しうる方法を提
供することにある。Therefore, an object of the present invention is to prevent the binder from moving into the mold from an aqueous slurry containing a ceramic raw material and a binder, to distribute the binder uniformly inside the molded body, and to prevent warping or cracking from occurring during the drying process. Another object of the present invention is to provide a method for efficiently manufacturing a ceramic molded body having high strength.
（問題点を解決するための手段）
本発明者らは、このような問題を解決するために鋭意研
究を重ねた結果、バインダーとして平均重合度５０〜２
０００．平均ケン化度２〜７５モル％のポ１す酢酸ビニ
ルの部分ケン化物を用いることにより、上記のごとき目
的を達成しうろことを見出し１本発明に到達した。(Means for Solving the Problems) As a result of extensive research in order to solve these problems, the present inventors found that the average degree of polymerization is 50 to 2 as a binder.
000. The inventors have discovered that the above objectives can be achieved by using a partially saponified product of polyvinyl acetate having an average degree of saponification of 2 to 75 mol%, and have thus arrived at the present invention.
すなわち１本発明は、（Ａ）セラミックス原料１００重
量部と、（Ｂ）平均重合度５０〜２０００．平均ケン化
度２〜７５モル％のポリ酢酸ビニルの部分ケン化物０．
２〜１０重量部とを含む水性スラリーを鋳込み成形する
ことを特徴とするセラミックス成形体の製造方法を要旨
とするものである。That is, one aspect of the present invention includes (A) 100 parts by weight of a ceramic raw material, and (B) an average degree of polymerization of 50 to 2,000. Partially saponified polyvinyl acetate with an average saponification degree of 2 to 75 mol% 0.
The gist of the present invention is a method for manufacturing a ceramic molded body, characterized by casting an aqueous slurry containing 2 to 10 parts by weight.
本発明に用いられるセラミックス原料としては。Ceramic raw materials used in the present invention include:
アルミナ、ジルコニア、フェライト等の酸化物系。Oxide-based materials such as alumina, zirconia, and ferrite.
炭化珪素等の非酸化物系のものがあげられるが。Examples include non-oxide based materials such as silicon carbide.
必ずしもこれに限られるものではない。It is not necessarily limited to this.
本発明においてバインダーとして用いられるポリ酢酸ビ
ニルの部分ケン化物は、平均重合度５０〜２０００．平
均ケン化度２〜７５モル％のものである。ポリ酢酸ビニ
ルの部分ケン化物の平均重合度が５０未満の場合は、得
られるセラミックス成形体の強度が弱く、一方、 ２０
００を越えるとバインダーが均一に乳化分散することが
困難となる。また。The partially saponified polyvinyl acetate used as a binder in the present invention has an average degree of polymerization of 50 to 2,000. The average degree of saponification is 2 to 75 mol%. When the average degree of polymerization of the partially saponified polyvinyl acetate is less than 50, the strength of the resulting ceramic molded body is low;
If it exceeds 00, it becomes difficult to emulsify and disperse the binder uniformly. Also.
平均ケン化度が２モル％未満の場合は、バインダーをス
ラリー中に均一に分散することが困難となり、一方、７
５モル％を越えると水溶性になり。If the average degree of saponification is less than 2 mol%, it will be difficult to uniformly disperse the binder in the slurry;
If it exceeds 5 mol%, it becomes water-soluble.
脱水の際、水と共にバインダーが多孔体の型に移動する
ようになる。ポリ酢酸ビニルの部分ケン化物は未変性に
限定されるものではなく２本発明の効果を損なわない範
囲で、たとえばアルキルビニルエーテル、ヒドロキシビ
ニルエーテル、酢酸アリル、アミド、ビニルシラン等で
変性されたものであってもよい。さらに、平均重合度や
平均ケン化度が異なるもの等を２種以上混合したもので
あってもよい。During dehydration, the binder moves into the porous mold along with the water. The partially saponified product of polyvinyl acetate is not limited to unmodified products, but may be modified with, for example, alkyl vinyl ether, hydroxy vinyl ether, allyl acetate, amide, vinyl silane, etc., to the extent that the effects of the present invention are not impaired. Good too. Furthermore, a mixture of two or more types having different average degrees of polymerization and average saponification degrees may be used.
本発明は、セラミックス原料と、上記のごときポリ酢酸
ビニルの部分ケン化物とを含む水性スラリーを用いて鋳
込み成形するものであるが、このような水性スラリーは
、たとえば以下のようにして調製することができる。す
なわち、セラミックス原料１００重量部と、平均重合度
５０〜２０００゜好ましくは１００〜１０００．平均ケ
ン化度２〜７５モル％９好ましくは１０〜６５モル％の
ポリ酢酸ビニルの部分ケン化物の粉末０．２〜１０重量
部。The present invention involves casting using an aqueous slurry containing a ceramic raw material and a partially saponified product of polyvinyl acetate as described above. Such an aqueous slurry can be prepared, for example, as follows. I can do it. That is, 100 parts by weight of ceramic raw materials and an average degree of polymerization of 50 to 2,000 degrees, preferably 100 to 1,000 degrees. 0.2 to 10 parts by weight of powder of partially saponified polyvinyl acetate having an average saponification degree of 2 to 75 mol%, preferably 10 to 65 mol%.
好ましくは０．５〜５重量部と、水とを混合し、ボール
ミルやニーグー等の混合機で所要時間混練すればよい。Preferably, 0.5 to 5 parts by weight may be mixed with water and kneaded for the required time using a mixer such as a ball mill or a Ni-Goo mixer.
ポリ酢酸ビニルの部分ケン化物は予め乳化分散し、溶液
としたものを用いてもよい。水の量は特に限定されるも
のではないが、スラリーの安定性あるいは脱水性の点か
ら見て、セラミックス原料１００重量部に対して１５〜
１００重量部が好ましい。また９本発明に用いられる水
性スラリーは、必要に応じてポリカルボン酸アンモニウ
ム、ポリアクリル酸オリゴマーあるいはそのアンモニウ
ム塩等の分散剤、グリセリン、グライコール類、ペトリ
オール類等の可塑剤あるいは他の添加剤を加えたもので
あってもさしつかえない。The partially saponified product of polyvinyl acetate may be emulsified and dispersed in advance to form a solution. The amount of water is not particularly limited, but from the viewpoint of slurry stability or dehydration, it is 15 to 15 parts by weight per 100 parts by weight of the ceramic raw material.
100 parts by weight is preferred. In addition, the aqueous slurry used in the present invention may optionally contain dispersants such as ammonium polycarboxylate, polyacrylic acid oligomers or ammonium salts thereof, plasticizers such as glycerin, glycols, and petriol, or other additives. It is acceptable even if it contains an agent.
本発明においては、上記のようにして得られた水性スラ
リーを多孔体の型に流し込み、鋳込み成形すればよい。In the present invention, the aqueous slurry obtained as described above may be poured into a porous mold and cast.
鋳込み成形には公知の装置及び方法を適宜選択して採用
すればよい。For cast molding, a known device and method may be appropriately selected and employed.
水性スラリーを用いて鋳込み成形する際、脱水が進んで
もバインダーが型に移動せず、型の目詰りは起こらない
ため、脱水速度の低下はほとんどなく、短時間で容易に
型から脱着できるようになり、しかも、成形体内部にお
けるバインダーの分布が均一で乾燥工程におけるそりや
ヒビ割れが発生せず、その結果２強度の高いセラミック
ス成形体を効率良く得ることができ、製品の不良率が著
しく減少する理由は明らかでないが、おそらくバインダ
ーとしてのポリ酢酸ビニルの部分ケン化物が水に完溶せ
ず、その大部分が水性スラリー中に乳化分散しているた
め、バインダーは移動せずに。When performing cast molding using an aqueous slurry, the binder does not move into the mold even as dehydration progresses, and the mold does not become clogged, so there is almost no drop in dehydration speed and it can be easily removed from the mold in a short time. Furthermore, the distribution of the binder inside the molded body is uniform, and no warping or cracking occurs during the drying process.As a result, a ceramic molded body with high strength can be obtained efficiently, and the defective rate of the product is significantly reduced. The reason for this is not clear, but it is probably because the partially saponified product of polyvinyl acetate as a binder is not completely dissolved in water and most of it is emulsified and dispersed in the aqueous slurry, so the binder does not move.
水のみが多孔体の型に移動し脱水が進み、そのためにも
バインダーによる型の目詰まりは起こらず。Only water moves into the porous mold, dehydration progresses, and as a result, the binder does not clog the mold.
全量バインダーとして成形体内に均一に分布するためと
考えられる。This is thought to be because the total amount is distributed uniformly within the molded body as a binder.
（実施例）
次に、実施例をあげて本発明をさらに具体的に説明する
。(Example) Next, the present invention will be described in more detail with reference to Examples.
実施例１
アルミナ（平均粒径０．６μ）１００重量部と、平均重
合度１８０．平均ケン化度３５モル％のポリ酢酸ビニル
樹脂の部分ケン化物２重量部と、水４４重量部とをボー
ルミルで２４時間混練し、水性スラリーを得た。このス
ラリーの粘度は３０℃で４２０ｃｐｓであった。得られ
たスラリーを１０ｍｍφ×１１０ｍｍの石膏型に流し込
み、成形体を作成したところ、３０分で容易に脱型でき
るようになった。Example 1 100 parts by weight of alumina (average particle size: 0.6μ) and an average degree of polymerization of 180. 2 parts by weight of a partially saponified polyvinyl acetate resin having an average degree of saponification of 35 mol % and 44 parts by weight of water were kneaded in a ball mill for 24 hours to obtain an aqueous slurry. The viscosity of this slurry was 420 cps at 30°C. The resulting slurry was poured into a 10 mmφ x 110 mm plaster mold to create a molded product, which could be easily removed from the mold in 30 minutes.
このとき石膏へのバインダーの稼動は全く起こらなかっ
た。このものを更に、１０５℃で１時間乾燥したところ
そりやヒビ割れ等の発生は認められず、密度が２．２５
３ ｇ／ｃｔａで１強度が３４．８ｋｇ／ａｎ！のアル
ミナ成形体が得られた。At this time, no movement of the binder into the plaster occurred. When this material was further dried at 105℃ for 1 hour, no warping or cracking was observed, and the density was 2.25.
At 3 g/cta, the strength is 34.8 kg/an! An alumina molded body was obtained.
実施例２〜１０
表１に示す種々のセラミックス粉末及びポリ酢酸ビニル
樹脂の部分ケン化物を表工に示す割合で用い、実施例１
と同様にしてセラミックス成形体の作成を行った。結果
を表１に示した。Examples 2 to 10 Using various ceramic powders shown in Table 1 and partially saponified products of polyvinyl acetate resin in the proportions shown in the surface coating, Example 1
A ceramic molded body was prepared in the same manner as described above. The results are shown in Table 1.
比較例１
アルミナ（平均粒径０．６μ）１００重量部に水６２重
量部を加え、ボールミルで２２時間混練した後。Comparative Example 1 62 parts by weight of water was added to 100 parts by weight of alumina (average particle size 0.6 μm), and the mixture was kneaded in a ball mill for 22 hours.
平均重合度６００．平均ケン化物８８モル％のＰＶＡ２
０％水溶液を１０重量部加え、更に、２時間混練して水
性スラリーを得た。このスラリーの粘度は３０°Ｃで５
６０ｃｐｓであった。得られたスラリーを用いて実施例
１と同様にして成形体を作成したところ、脱型できるよ
うになるまでに１時間かかった。またこのときにはバイ
ンダーは石膏型にかなり移動していた。このものを、更
に、１０５℃で１時間乾燥したところ、そりが発生し１
円柱の中心部が細く変形した。得られたアルミナ成形体
の密度は、 ２．０８７ｇ／ｃｎｌで強度は２８．３
ｋｇ／ｃｒＭであった。Average degree of polymerization: 600. PVA2 with an average saponified content of 88 mol%
10 parts by weight of a 0% aqueous solution was added and kneaded for further 2 hours to obtain an aqueous slurry. The viscosity of this slurry is 5 at 30°C.
It was 60 cps. When a molded article was prepared in the same manner as in Example 1 using the obtained slurry, it took one hour before it could be demolded. Also, by this time the binder had migrated considerably into the plaster mold. When this material was further dried at 105°C for 1 hour, warping occurred and 1
The center of the cylinder became thin and deformed. The density of the obtained alumina molded body was 2.087 g/cnl, and the strength was 28.3.
kg/crM.
比較例２
アルミナ（平均粒径０．６μ）１００重量部と、平均重
合度１８０．平均ケン化度１モル％のポリ酢酸ビニル樹
脂の部分ケン化物２重量部と、水４４重量部とをボール
ミルに入れ、２４時間混練し、水性スラリーを作成した
が未分散のバインダーが多量に残った。このスラリーの
粘度は３０℃で３２０ｃｐｓであった。このスラリーを
用いて実施例１と同様にして成形体を作成したところ、
非常にもろい成形体しか得られなかった。Comparative Example 2 100 parts by weight of alumina (average particle size 0.6μ) and average degree of polymerization 180. 2 parts by weight of partially saponified polyvinyl acetate resin with an average saponification degree of 1 mol% and 44 parts by weight of water were placed in a ball mill and kneaded for 24 hours to create an aqueous slurry, but a large amount of undispersed binder remained. Ta. The viscosity of this slurry was 320 cps at 30°C. A molded body was created using this slurry in the same manner as in Example 1.
Only very brittle moldings were obtained.
比較例３
平均重合度１８０．平均ケン化度３５モル％のポリ酢酸
ビニル樹脂の部分ケン化物にかえて、平均重合度１８０
．平均ケン化度８０モル％のポリ酢酸ビニル樹脂の部分
ケン化物を用いた以外は実施例１と同様にしてセラミッ
クス成形体の作成を行った。結果を表１に示した。Comparative Example 3 Average degree of polymerization 180. Instead of a partially saponified polyvinyl acetate resin with an average saponification degree of 35 mol%, an average polymerization degree of 180
．． A ceramic molded body was prepared in the same manner as in Example 1 except that a partially saponified polyvinyl acetate resin having an average degree of saponification of 80 mol% was used. The results are shown in Table 1.
比較例４
平均重合度１８０．平均ケン化度３５モル％のポリ酢酸
ビニル樹脂の部分ケン化物にかえて平均重合度３０．平
均ケン化度５０モル％のポリ酢酸ビニル樹脂の部分ケン
化物を用いた以外は実施例１と同様にしてセラミックス
成形体の作成を行った。Comparative Example 4 Average degree of polymerization 180. Instead of a partially saponified polyvinyl acetate resin with an average saponification degree of 35 mol%, an average polymerization degree of 30. A ceramic molded body was produced in the same manner as in Example 1 except that a partially saponified polyvinyl acetate resin having an average saponification degree of 50 mol% was used.
結果を表１に示した。The results are shown in Table 1.
比較例５
アルミナ（平均粒径０．６μ）１００重量部に水６２重
量部を加えボールミルで２２時間混練した後。Comparative Example 5 62 parts by weight of water was added to 100 parts by weight of alumina (average particle size 0.6 μm) and kneaded in a ball mill for 22 hours.
デンプンの２０％水溶液を１０重量部加え、更に。Add 10 parts by weight of a 20% aqueous solution of starch;
２時間混練して水性スラリーを得た。このスラリーの粘
度は３０°Ｃで４７０ｃｐｓであった。得られたスラリ
ーを用いて実施例１と同様にして成形体を作成したとこ
ろ、脱型までに４５分を要し９石膏型へのバインダーの
移動も認められた。更に、この成形体を１０５℃で１時
間乾燥したところ、そりが発生し、得られたアルミナ成
形体の密度は２．０５３ｇ／ｃｎｔで１強度は１３．８
ｋｇ／ｃ＋Ａと低いものであった。After kneading for 2 hours, an aqueous slurry was obtained. The viscosity of this slurry was 470 cps at 30°C. When a molded article was prepared in the same manner as in Example 1 using the obtained slurry, it took 45 minutes to remove the mold, and migration of the binder to the plaster mold was also observed. Furthermore, when this molded body was dried at 105°C for 1 hour, warping occurred, and the density of the obtained alumina molded body was 2.053 g/cnt, and the 1 strength was 13.8.
It was as low as kg/c+A.
（発明の効果）
本発明によると、型へのバインダーの移動が起こらず、
成形体内部のバインダーの分布が均一になるので、型か
らの脱却が容易で、かつ乾燥によりそりやヒビ割れを発
生しないセラミックス成形体を能率良く得ることができ
る。しかも、得られたセラミックス成形体の密度及び強
度は高い。さらに、バインダーによる目詰まりがないた
め、多孔体の型の寿命が著しく延びるなどセラミックス
成形体の製造方法として工業的に極めて有効である。(Effects of the Invention) According to the present invention, the binder does not move to the mold,
Since the distribution of the binder inside the molded body becomes uniform, it is possible to efficiently obtain a ceramic molded body that is easy to release from the mold and does not cause warping or cracking upon drying. Moreover, the density and strength of the obtained ceramic molded body are high. Furthermore, since there is no clogging caused by the binder, the life of the mold for the porous body is significantly extended, making this method extremely effective industrially as a method for manufacturing ceramic molded bodies.
Claims (1)
５モル％のポリ酢酸ビニルの部分ケン化物０．２〜１０
重量部とを含む水性スラリーを鋳込み成形することを特
徴とするセラミックス成形体の製造方法。(1) (A) 100 parts by weight of ceramic raw materials; (B) average degree of polymerization 50-2000, average degree of saponification 2-7
5 mol% polyvinyl acetate partially saponified product 0.2-10
1. A method for producing a ceramic molded body, comprising casting an aqueous slurry containing parts by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61033639A JPS62191458A (en) | 1986-02-18 | 1986-02-18 | Manufacture of ceramic formed body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61033639A JPS62191458A (en) | 1986-02-18 | 1986-02-18 | Manufacture of ceramic formed body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62191458A true JPS62191458A (en) | 1987-08-21 |
| JPH0331661B2 JPH0331661B2 (en) | 1991-05-08 |
Family
ID=12392018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61033639A Granted JPS62191458A (en) | 1986-02-18 | 1986-02-18 | Manufacture of ceramic formed body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62191458A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020183636A1 (en) * | 2019-03-13 | 2020-09-17 | 互応化学工業株式会社 | Binder composition for producing green sheet, slurry composition for firing, method for producing green sheet, method for producing sintered body, and method for producing layered ceramic capacitor |
-
1986
- 1986-02-18 JP JP61033639A patent/JPS62191458A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020183636A1 (en) * | 2019-03-13 | 2020-09-17 | 互応化学工業株式会社 | Binder composition for producing green sheet, slurry composition for firing, method for producing green sheet, method for producing sintered body, and method for producing layered ceramic capacitor |
| JPWO2020183636A1 (en) * | 2019-03-13 | 2020-09-17 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0331661B2 (en) | 1991-05-08 |
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