JPS62182150A - Manufacture of ceramic formed body - Google Patents
Manufacture of ceramic formed bodyInfo
- Publication number
- JPS62182150A JPS62182150A JP61024500A JP2450086A JPS62182150A JP S62182150 A JPS62182150 A JP S62182150A JP 61024500 A JP61024500 A JP 61024500A JP 2450086 A JP2450086 A JP 2450086A JP S62182150 A JPS62182150 A JP S62182150A
- Authority
- JP
- Japan
- Prior art keywords
- granules
- average
- mol
- polyvinyl acetate
- weight
- 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 23
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 239000008187 granular material Substances 0.000 claims description 48
- 239000002002 slurry Substances 0.000 claims description 20
- 229920002689 polyvinyl acetate Polymers 0.000 claims description 18
- 239000011118 polyvinyl acetate Substances 0.000 claims description 18
- 238000006116 polymerization reaction Methods 0.000 claims description 16
- 238000007127 saponification reaction Methods 0.000 claims description 16
- 238000000465 moulding Methods 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 7
- 239000011230 binding agent Substances 0.000 description 16
- 239000000047 product Substances 0.000 description 11
- 239000010410 layer Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 6
- 239000004372 Polyvinyl alcohol Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 238000013508 migration Methods 0.000 description 5
- 230000005012 migration Effects 0.000 description 5
- 229920002451 polyvinyl alcohol Polymers 0.000 description 5
- 239000007921 spray Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 239000002356 single layer Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- -1 alkyl vinyl ether Chemical compound 0.000 description 2
- CUZMQPZYCDIHQL-VCTVXEGHSA-L calcium;(2s)-1-[(2s)-3-[(2r)-2-(cyclohexanecarbonylamino)propanoyl]sulfanyl-2-methylpropanoyl]pyrrolidine-2-carboxylate Chemical compound [Ca+2].N([C@H](C)C(=O)SC[C@@H](C)C(=O)N1[C@@H](CCC1)C([O-])=O)C(=O)C1CCCCC1.N([C@H](C)C(=O)SC[C@@H](C)C(=O)N1[C@@H](CCC1)C([O-])=O)C(=O)C1CCCCC1 CUZMQPZYCDIHQL-VCTVXEGHSA-L 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000002244 precipitate 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
- 235000021355 Stearic acid Nutrition 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000007796 conventional method 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
- 238000004898 kneading Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 239000000123 paper Substances 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
- 238000003825 pressing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 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
- 238000001694 spray drying Methods 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- UKRDPEFKFJNXQM-UHFFFAOYSA-N vinylsilane Chemical group [SiH3]C=C UKRDPEFKFJNXQM-UHFFFAOYSA-N 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
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、プレス成形により、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 (Industrial Field of Application) The present invention relates to a method of manufacturing a ceramic molded body by press molding.
(従来の技術)
従来、セラミックス成形体を製造する方法としては1種
々の方法が採用されているが、なかでもプレス成形法が
一般的で広く行われている。たとえばセラミックス原料
とバインダーと水とから水性スラリーを調製し、これを
スプレードライヤーで噴霧乾燥して顆粒を得、得られた
顆粒をプレス成形することによりセラミックス成形体が
製造されており、バインダーとしては、一般に、水溶性
のポリビニルアルコール(以下PVAと略する。)が使
用されている。そして、水性スラリーを造粒乾燥して得
られる顆粒の形状及び性能がプレス工程での作業性に大
きな影響を及ぼし、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。(Prior Art) Conventionally, various methods have been employed to manufacture ceramic molded bodies, and among them, press molding is the most common and widely used method. For example, a ceramic molded body is manufactured by preparing an aqueous slurry from ceramic raw materials, a binder, and water, spray-drying this with a spray dryer to obtain granules, and press-molding the obtained granules. Generally, water-soluble polyvinyl alcohol (hereinafter abbreviated as PVA) is used. The shape and performance of the granules obtained by granulating and drying the aqueous slurry have a great influence on the workability in the pressing process, and influence 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、上記のような従来法では、水溶性のPV
Aをバインダーとして使用するため、水性スラリーを造
粒乾燥する際に、マイグレーションにより顆粒表面にP
VA層が形成され、このようなPVA層が形成された後
は、この層の1ケ所から水が飛散し乾燥が終了していた
。その結果。(Problems to be solved by the invention) However, in the conventional method as described above, water-soluble PV
Since A is used as a binder, when the aqueous slurry is granulated and dried, P is deposited on the granule surface due to migration.
After the VA layer was formed and such a PVA layer was formed, water was scattered from one place in this layer and drying was completed. the result.
飛散箇所から陥没が発生し1球状の顆粒を安定して得る
ことが非常に困難であった。It was very difficult to stably obtain single spherical granules because cavities occurred from the scattered areas.
ここで、造粒した顆粒が陥没し、形状が球状でなくなる
と、顆粒の流動性が悪くなり、プレス成形時における金
型への顆粒の安定供給ができなくなるという問題があっ
た。また、プレス圧の伝達能も極端に悪くなり、セラミ
ックス成形体の密度及び強度が大きくバラツキ、良好な
製品を効率良く得ることが難しいという問題があった。Here, when the granulated granules cave in and lose their spherical shape, the fluidity of the granules deteriorates, resulting in a problem that stable supply of the granules to the mold during press molding becomes impossible. Furthermore, there were problems in that the ability to transmit press pressure was extremely poor, the density and strength of the ceramic molded bodies varied widely, and it was difficult to efficiently obtain a good product.
さらに。moreover.
マイグレーションにより顆粒表面にPVA層が形成され
ると、顆粒は非常に堅くなり、つぶれにくくなるため、
成形時に大きなプレス圧が必要となり、金型の寿命が短
かくなるといった問題があった。したがって1本発明の
目的は、低いプレス圧で密度及び強度の高いセラミック
ス成形体を安定して、効率良く製造しうる方法を提供す
ることにある。When a PVA layer is formed on the granule surface due to migration, the granule becomes very hard and difficult to crush.
There was a problem in that large press pressure was required during molding, which shortened the life of the mold. Therefore, one object of the present invention is to provide a method for stably and efficiently producing a ceramic molded body having high density and strength at low press pressure.
(問題点を解決するための手段)
本発明者らは、このような目的を達成するため鋭意研究
を重ねた結果、平均重合度50〜2000゜平均ケン化
度2〜85モル%のポリ酢酸ビ会ルの部分ケン化物をバ
インダーとして用いれば、顆粒表面にバインダ一層が形
成されず、そのため球状の顆粒を容易に安定して得るこ
とができ、また得られた顆粒がつぶれ易<、シたがって
、上記のごとき目的が達成できることを見出し1本発明
に到達した。(Means for Solving the Problems) As a result of extensive research in order to achieve the above object, the present inventors have developed a polyacetic acid with an average degree of polymerization of 50 to 2000° and an average degree of saponification of 2 to 85 mol%. If a partially saponified product of vinyl chloride is used as a binder, a single layer of binder will not be formed on the surface of the granules, and therefore spherical granules can be obtained easily and stably. The inventors have discovered that the above objects can be achieved and have arrived at the present invention.
すなわち3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2〜85モル%のポリ酢酸ビニルの部分ケン化物0.
2〜10重量部を含む水性スラリーを造粒乾燥して得た
顆粒をプレス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, the present invention comprises (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 85 mol% 0.
The gist of the present invention is a method for producing a ceramic molded body, which comprises press-molding granules obtained by granulating and drying 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:
たとえばアルミナ、ジルコニア、フェライト等の酸化物
Aの、炭化ケイ素等の非酸化物系のものがあげられるが
、必ずしもこれらに限られるものではない。Examples include, but are not limited to, oxide A such as alumina, zirconia, and ferrite, and non-oxides such as silicon carbide.
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2〜85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を越える場合は顆粒が堅(つぶれにくいため、成形
時に大きなプレス圧が必要となる。また、平均ケン化度
が2モル%未満の場合は、バインダーのスラリー中への
均一分散が困難となり、一方、85モル%を越えると水
溶性になり100℃以下で曇点かなくなり、乾燥段階で
温度が上昇しても析出しなくなるため、マイグレーショ
ンにより顆粒表面にバインダ一層が形成され2球状、と
くに真球の顆粒を得ることが困難となる。The partially saponified polyvinyl acetate used as a binder in the present invention has an average degree of polymerization of 50 to 2,000. It has an average saponification degree of 2 to 85 mol%. If the average degree of polymerization of the partially saponified polyvinyl acetate product is less than 50, the strength of the resulting ceramic molded body will be low;
If it exceeds 00, the granules are hard (hard to crush, so large press pressure is required during molding.If the average degree of saponification is less than 2 mol%, it will be difficult to uniformly disperse the binder in the slurry, On the other hand, if it exceeds 85 mol%, it will become water-soluble and will not have a cloud point below 100°C, and will not precipitate even if the temperature rises in the drying stage, so a single layer of binder will be formed on the surface of the granules due to migration, resulting in two-spherical, especially true It becomes difficult to obtain spherical granules.
ポリ酢酸ビニルの部分ケン化物は未変性のものに限定さ
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。The partially saponified product of polyvinyl acetate is not limited to unmodified products, but may be used within the range that does not impair the effects of the present invention.
For example, alkyl vinyl ether.
ヒドロキシビニルエーテル、酢酸アリル、アミド。Hydroxy vinyl ether, allyl acetate, amide.
ビニルシラン等で変性された物であってもよい。It may also be a material modified with vinyl silane or the like.
さらに、平均重合度や平均ケン化度の異なるもの等を2
種以上混合したものであってもよい。In addition, two types of materials with different average degrees of polymerization and average saponification degrees, etc.
It may be a mixture of more than one species.
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からなる顆粒をプレス成形するもの
であるが、このような顆粒は、たとえば以下のようにし
て調製することができる。In the present invention, granules made of a ceramic raw material and a partially saponified product of polyvinyl acetate as described above are press-molded, and such granules can be prepared, for example, as follows.
まず、セラミックス原料100重量部と、平均重合度5
0〜2000.好ましくは100〜1000.平均ケン
化度2〜85モル%、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を0.2〜lO重量
部、好ましくは0.5〜5重量部と、水とを混合し、ボ
ールミルやニーダ−等の混合機で混練して水性スラリー
を得、得られた水性スラリーをスプレードライヤーを用
いて造粒乾燥すればよい。水の量は特に限定されるもの
ではないが。First, 100 parts by weight of ceramic raw materials and an average polymerization degree of 5
0~2000. Preferably 100-1000. A powder of a partially saponified polyvinyl acetate having an average saponification degree of 2 to 85 mol%, preferably 10 to 65 mol%, is mixed with 0.2 to 10 parts by weight, preferably 0.5 to 5 parts by weight, and water. They may be mixed and kneaded using a mixer such as a ball mill or a kneader to obtain an aqueous slurry, and the resulting aqueous slurry may be granulated and dried using a spray dryer. The amount of water is not particularly limited.
スラリーの安定性、乾燥速度あるいは乾燥熱量の点から
見て15〜100重里部が好ましい。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。また1本発明に用いられる顆粒は必要に応して
、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1ペトリオール頽等の可塑剤、ワッ
クス。From the viewpoint of slurry stability, drying speed, or drying heat amount, 15 to 100 parts by weight is preferable. Partially saponified polyvinyl acetate may be emulsified and dispersed in advance to form a solution. In addition, the granules 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, petriol, and wax.
ステアリン酸あるいはその塩等の滑剤を添加したもので
あってもよい。A lubricant such as stearic acid or a salt thereof may be added.
水性スラリーから顆粒を形成する際に、マイグレーショ
ンにより顆粒表面にバインダ一層が形成されず、陥没の
ない球状の顆粒、とくに好ましくは真珠の顆粒を容易に
安定して得ることができる理由は、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性スラリー
中に乳化分散しているか、あるいは溶解していても10
0℃以下で曇点を持つため乾燥段階での温度上昇に伴な
って析出することにより、バインダーの自由度が失われ
マイグレーションが起こらないためと考えられる。When forming granules from an aqueous slurry, a single layer of binder is not formed on the granule surface due to migration, and the reason why spherical granules without depressions, particularly preferably pearl granules, can be easily and stably obtained is probably due to the binder. Even if the partially saponified product of polyvinyl acetate is emulsified and dispersed in the aqueous slurry or dissolved,
This is thought to be because the binder has a cloud point below 0° C., so it precipitates as the temperature rises during the drying stage, and the flexibility of the binder is lost and migration does not occur.
(実施例)
以下、実施例をあげて本発明をさらに具体的に説明する
。(Examples) Hereinafter, the present invention will be explained in more detail by giving examples.
実施例1
アルミナ(平均粒径0.6μ)100重量部に、平均重
合度180.平均ケン化度35モル%のポリ酢酸ビニル
の部分ケン化物2重量部と水55重量部をボールミルで
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420 cpsであった。ついでこのス
ラリーをスプレードライヤーで噴霧乾燥したところ、真
球で表面にバインダ一層のない顆粒を得ることができた
。この顆粒は流動性が良(、600kg/−のプレス圧
で成形したところ、顆粒は完全につぶれた。得られたア
ルミナ成形体の密度は2263g/cJで2強度は20
.9 kg/ cjであった。Example 1 100 parts by weight of alumina (average particle size 0.6μ) was added with an average degree of polymerization of 180. 2 parts by weight of a partially saponified polyvinyl acetate having an average saponification degree of 35 mol % and 55 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. When this slurry was then spray-dried using a spray dryer, it was possible to obtain granules that were perfectly spherical and had no binder layer on the surface. The granules had good fluidity (when molded at a press pressure of 600 kg/-, the granules were completely crushed. The density of the obtained alumina molded body was 2263 g/cJ, and the strength was 20
.. It was 9 kg/cj.
実施例2〜10
表1に示す種々のセラミックス原料及びポリ酢酸ビニル
の部分ケン化物を表1に示す割合で用い。Examples 2 to 10 Various ceramic raw materials shown in Table 1 and partially saponified products of polyvinyl acetate were used in the proportions shown in Table 1.
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。A ceramic molded body was produced in the same manner as in Example 1. The results are shown in Table 1.
ここで、顆粒の流動性は、厚紙に顆粒を乗せ傾けて行き
顆粒が動き始める時の角度で評価した。Here, the fluidity of the granules was evaluated by placing the granules on cardboard and tilting the paper, and measuring the angle at which the granules started to move.
また、顆粒のつぶれ易さについては、プレス成形した時
、成形物表面で顆粒の形状が判別できなくなるのに要す
るプレス圧で評価した。評価の基準は下記の通りである
。Furthermore, the crushability of the granules was evaluated by the press pressure required to make the shape of the granules indistinguishable on the surface of the molded product when press-molded. The evaluation criteria are as follows.
評価 顆粒の流動性 ○:顆粒が動き始める時の角度が30度未満。evaluation Granule fluidity ○: The angle when the granules start moving is less than 30 degrees.
×:顆粒が動き始める時の角度が30度以上。×: The angle when the granules start moving is 30 degrees or more.
顆粒のつぶれ易さ
◎ニブレス圧が500 kg / cnT以下で顆粒の
形状が判別できなくなる。Ease of crushing of granules◎If the nibless pressure is less than 500 kg/cnT, the shape of the granules cannot be determined.
Oニブレス圧が500〜600kg/c艷で顆粒の形状
が判別できなくなる。When the O-nibble pressure is 500 to 600 kg/c, the shape of the granules cannot be determined.
△ニブレス圧が600〜800 kg/crAで顆粒の
形状が判別できなくなる。△When the nibless pressure is 600 to 800 kg/crA, the shape of the granules cannot be determined.
×:顆粒の形状が判別できなくなるには800kg /
ca1以上のプレス圧が必要である。×: It takes 800 kg for the shape of the granules to become indiscernible.
A press pressure of ca1 or higher is required.
比較例1
アルミナ(平均粒径0.6μ)100重量部に水75重
量部をボールミルで22時間混練した後、平均重合度6
00.平均ケン化度88モル%のPVAの20%水溶液
を10重量部加え、更に、2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560 cpsで
あった。ついで、このスラリーをスプレードライヤーで
噴霧乾燥したところ。Comparative Example 1 After kneading 100 parts by weight of alumina (average particle size 0.6μ) and 75 parts by weight of water in a ball mill for 22 hours, the average degree of polymerization was 6.
00. 10 parts by weight of a 20% aqueous solution of PVA having an average degree of saponification of 88 mol % was added, and the mixture was further kneaded for 2 hours to obtain an aqueous slurry. The viscosity of this slurry was 560 cps at 30°C. This slurry was then spray-dried using a spray dryer.
表面には完全にバインダ一層が形成され、非常に陥没の
多い顆粒となった。この顆粒は堅<、600kg/ci
のプレス圧で成形したところ顆粒の境界が完 □全に残
った。また、得られたアルミナ成形体の密度は2197
g/cJで1強度は10.2 kg/a(と共に低いも
のであった。A single layer of binder was completely formed on the surface, resulting in granules with many depressions. This granule is hard <, 600 kg/ci
When molded with a press pressure of □, the boundaries of the granules remained completely. In addition, the density of the obtained alumina molded body was 2197
In terms of g/cJ, the strength was 10.2 kg/a (which was also low).
比較例2
アルミナ(平均粒径0.6μ)100重景小形、平均重
合度180.平均ケン化度1モル%のポリ酢酸ビニルの
部分ケン化物2重量部と、水55重量部をボールミルで
24時間混練し水性スラリーとした。このスラリーは粘
度が30℃で320cpsであったが、未分散のバイン
ダーが多量に残った。ついで、このスラリーをスプレー
ドライヤーで噴霧乾燥したところ顆粒の形状は悪く、大
量の微粉が発生した。また、この顆粒の成形は非常に困
難であった。Comparative Example 2 Alumina (average particle size: 0.6 μm), 100-layer small size, average degree of polymerization: 180. 2 parts by weight of partially saponified polyvinyl acetate having an average degree of saponification of 1 mol % and 55 parts by weight of water were kneaded in a ball mill for 24 hours to obtain an aqueous slurry. This slurry had a viscosity of 320 cps at 30°C, but a large amount of undispersed binder remained. When this slurry was then spray-dried using a spray dryer, the shape of the granules was poor and a large amount of fine powder was generated. Also, it was very difficult to mold these granules.
比較例3
平均重合度180.平均ケン化度35モル%のポリ酢酸
ビニルの部分ケン化物にかえて、平均重合度180.平
均ケン化度85モル%のポリ酢酸ビニルの部分ケン化物
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
体を作成した。結果を表1に示した。Comparative Example 3 Average degree of polymerization 180. Instead of a partially saponified polyvinyl acetate with an average saponification degree of 35 mol%, an average polymerization degree of 180. A ceramic molded body was produced in the same manner as in Example 1 except that a partially saponified polyvinyl acetate having an average degree of saponification of 85 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
ビニルの部分ケン化物にかえて、平均重合度30.平均
ケン化度60モル%のポリ酢酸ビニルの部分ケン化物を
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
を作成した。結果を表1に示した。Comparative Example 4 Average degree of polymerization 180. Instead of a partially saponified polyvinyl acetate having an average saponification degree of 35 mol%, an average degree of polymerization of 30. A ceramic molded body was produced in the same manner as in Example 1 except that a partially saponified polyvinyl acetate having an average saponification degree of 60 mol% was used. The results are shown in Table 1.
比較例5
平均重合度180.平均ケン化度35モル%のポリ酢酸
ビニルの部分にかえて平均重合度2500.平均ケン化
度65モル%のポリ酢酸ビニル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を作成
した。結果を表1に示した。Comparative Example 5 Average degree of polymerization 180. In place of the polyvinyl acetate portion with an average saponification degree of 35 mol%, an average polymerization degree of 2500. A ceramic molded body was produced in the same manner as in Example 1 except that a partially saponified polyvinyl acetate having an average saponification degree of 65 mol% was used. The results are shown in Table 1.
(発明の効果) 本発明によると1表面にバインダ一層を有せず。(Effect of the invention) According to the present invention, there is no binder layer on one surface.
陥没もなく、かつ球状であり、好適には真球である流動
性の良い顆粒を効率良く得ることができ。It is possible to efficiently obtain granules with good fluidity that are free from depression and are spherical, preferably true spherical.
そのため金型への顆粒の供給ムラは起こらず、製品の歩
留りを著しく向上することができる。また。Therefore, uneven supply of granules to the mold does not occur, and the yield of products can be significantly improved. Also.
顆粒はつぶれ易いので、低いプレス圧で成形しても高密
度で高強度のセラミックス成形体を得ることができる。Since the granules are easily crushed, a high-density and high-strength ceramic molded body can be obtained even when molded at low press pressure.
そのため、金型の寿命が長くなり。Therefore, the life of the mold is extended.
工業的に非常に有効である。It is industrially very effective.
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造粒乾燥して得た顆粒を
プレス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 to 2000, average degree of saponification 2 to 8
5 mol% polyvinyl acetate partially saponified product 0.2-10
1. A method for producing a ceramic molded body, comprising press-molding granules obtained by granulating and drying an aqueous slurry containing parts by weight.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61024500A JPS62182150A (en) | 1986-02-06 | 1986-02-06 | Manufacture of ceramic formed body |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61024500A JPS62182150A (en) | 1986-02-06 | 1986-02-06 | Manufacture of ceramic formed body |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS62182150A true JPS62182150A (en) | 1987-08-10 |
JPH0331660B2 JPH0331660B2 (en) | 1991-05-08 |
Family
ID=12139905
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP61024500A Granted JPS62182150A (en) | 1986-02-06 | 1986-02-06 | Manufacture of ceramic formed body |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS62182150A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100473295B1 (en) * | 2001-04-27 | 2005-03-08 | 티디케이가부시기가이샤 | Process for producing granules for being molded into ferrite, granules for being molded into ferrite, green body and sintered body |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP7217856B2 (en) * | 2017-10-31 | 2023-02-06 | 株式会社レゾナック | Manufacturing method of sintered magnetic core, green compact, and sintered magnetic core |
-
1986
- 1986-02-06 JP JP61024500A patent/JPS62182150A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100473295B1 (en) * | 2001-04-27 | 2005-03-08 | 티디케이가부시기가이샤 | Process for producing granules for being molded into ferrite, granules for being molded into ferrite, green body and sintered body |
Also Published As
Publication number | Publication date |
---|---|
JPH0331660B2 (en) | 1991-05-08 |
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