JPH06116012A - In-mold extrusion plastic material - Google Patents
In-mold extrusion plastic materialInfo
- Publication number
- JPH06116012A JPH06116012A JP4270395A JP27039592A JPH06116012A JP H06116012 A JPH06116012 A JP H06116012A JP 4270395 A JP4270395 A JP 4270395A JP 27039592 A JP27039592 A JP 27039592A JP H06116012 A JPH06116012 A JP H06116012A
- Authority
- JP
- Japan
- Prior art keywords
- plastic material
- extrusion
- water
- cavity
- mold
- 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.)
- Pending
Links
Landscapes
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は型内押出用可塑性材料に
関し、詳しくは型内押出によりセラミックス成形体を得
る可塑性材料に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic material for in-mold extrusion, and more particularly to a plastic material for obtaining a ceramic molded body by in-mold extrusion.
【０００２】[0002]
【従来の技術】従来のセラミックス成形体の成形方法と
して、押出成形法が知られている。一般的な押出成形法
は、セラミック粉末、水、結合剤、分散剤、滑剤及び可
塑剤からなる粘土状の可塑性材料を用意し、押出機に所
望の断面形状を有するダイスを取付け、このダイスから
上記可塑性材料を押し出して棒状のセラミックス成形体
を得る（「セラミックス材料技術集成」昭和５４年４月
発行）、「ファインセラミックス・金属粉体成形用バイ
ンダ類の基礎と応用技術」昭和６３年１２月１０発
行）。2. Description of the Related Art An extrusion molding method is known as a conventional method for molding a ceramic molded body. A general extrusion molding method is to prepare a clay-like plastic material consisting of ceramic powder, water, a binder, a dispersant, a lubricant and a plasticizer, attach a die having a desired cross-sectional shape to the extruder, and from this die The plastic material is extruded to obtain a rod-shaped ceramic compact ("Ceramics Material Technology Collection", published in April 1979), "Fundamental and applied technology of binders for fine ceramics / metal powder molding", December 1988 10 issues).
【０００３】[0003]
【発明が解決しようとする課題】しかし、上記従来の押
出成形法では、パイプ、ハニカム、板類等のように断面
形状が長手方向で変化しない棒状の物を連続的に大量生
産することはできるものの、断面形状が長手方向で変化
する三次元形状のセラミックス成形体は成形できない。However, in the above-mentioned conventional extrusion molding method, it is possible to continuously mass-produce rod-shaped products such as pipes, honeycombs and plates whose cross-sectional shape does not change in the longitudinal direction. However, it is not possible to form a three-dimensional ceramics molded body whose cross-sectional shape changes in the longitudinal direction.
【０００４】また、従来の押出成形法では、押し出しに
よりセラミックス成形体が得られるためキャビティ内に
可塑性材料を充填することがなく、可塑性材料の離型性
は考慮されてはいなかった。このため、従来の押出成形
法に用いられていた可塑性材料により、三次元形状のセ
ラミックス成形体を得るべく、キャビティ内への型内押
出を行った場合、セラミックス成形体がキャビティ面に
張りつき、キャビティから容易に脱型できない。これ
は、水とメチルセルロース等の水溶性結合剤とのみを添
加した可塑性材料では、セラミック粉末が接着剤により
固められているのと同様であり、キャビティ内にこの可
塑性材料を押し出せば、水溶性結合剤によりセラミック
ス成形体がキャビティ面に付着し、剥がれにくくなるか
らである。Further, in the conventional extrusion molding method, since a ceramic molded body is obtained by extrusion, the cavity is not filled with the plastic material, and the releasability of the plastic material has not been considered. Therefore, when in-mold extrusion into the cavity is performed to obtain a three-dimensional ceramics molded body using the plastic material used in the conventional extrusion molding method, the ceramics molded body sticks to the cavity surface and Cannot be easily removed from the mold. This is similar to the case where the ceramic powder is hardened by the adhesive in the plastic material in which only water and a water-soluble binder such as methylcellulose are added, and if this plastic material is extruded into the cavity, the water-soluble This is because the ceramic molded body adheres to the cavity surface due to the binder and is difficult to peel off.
【０００５】このため、従来の可塑性材料では、優れた
離型性の下、三次元形状のニアネットシェイプセラミッ
クス成形体を得ることは困難である。本発明は、上記従
来の実情に鑑みてなされたものであって、優れた離型性
の下、三次元形状のニアネットシェイプセラミックス成
形体を得ることのできる型内押出用可塑性材料を提供す
ることを目的とする。Therefore, it is difficult to obtain a three-dimensional shaped near net shape ceramics molded body with excellent mold releasability using conventional plastic materials. The present invention has been made in view of the above conventional circumstances, and provides a plastic material for in-mold extrusion capable of obtaining a three-dimensional shape near net shape ceramics molded body under excellent mold releasability. The purpose is to
【０００６】[0006]
【課題を解決するための手段】本発明の型内押出用可塑
性材料は、三次元形状のキャビティ内に押出され、押出
の際の圧力により該キャビティ内に充填されるとともに
該キャビティで賦形されるセラミック粉末、水及び水溶
性結合剤を含む型内押出用可塑性材料であって、前記型
内押出用可塑性材料はアルギン酸ナトリウムを含むこと
を特徴とするものである。The plastic material for in-mold extrusion of the present invention is extruded into a cavity having a three-dimensional shape, filled in the cavity by the pressure during extrusion, and shaped in the cavity. A plastic material for in-mold extrusion, comprising ceramic powder, water and a water-soluble binder, wherein the in-mold extrusion plastic material contains sodium alginate.
【０００７】アルギン酸ナトリウムは、型内押出用可塑
性材料に含まれる水１００重量部に対し、０．５〜５重
量部であることが好ましい。Sodium alginate is preferably 0.5 to 5 parts by weight with respect to 100 parts by weight of water contained in the plastic material for in-mold extrusion.
【０００８】[0008]
【作用】本発明の型内押出用可塑性材料は、キャビティ
内において可塑性材料が流動し、押出の際の圧力で三次
元形状のキャビティ内に充填されるとともに同キャビテ
ィで賦形される。賦形された可塑性材料は、アルギン酸
ナトリウムを含むことにより溶媒が型とセラミックス成
形体の間へしみ出しにくいため、水溶性結合剤の作用が
得られるとともに、従来の可塑性材料に比べて脱型が容
易である。In the plastic material for in-mold extrusion of the present invention, the plastic material flows in the cavity and is filled in the three-dimensional cavity by the pressure during extrusion and is shaped in the cavity. Since the shaped plastic material contains sodium alginate, the solvent is less likely to seep between the mold and the ceramic molded body, so that the action of the water-soluble binder can be obtained and the mold release can be performed more easily than the conventional plastic material. It's easy.
【０００９】アルギン酸ナトリウムが型内押出用可塑性
材料に含まれる水１００重量部に対し、０．５〜５重量
部である場合には、脱型が容易であるとともに、保形性
がよい。アルギン酸ナトリウムが水１００重量部に対
し、０．５重量部未満である場合には、離型性向上の効
果が少なく、５重量部を超えれば、セラミックス成形体
が弾力性を有して保形性が損なわれやすい。When the amount of sodium alginate is 0.5 to 5 parts by weight with respect to 100 parts by weight of water contained in the plastic material for in-mold extrusion, demolding is easy and shape retention is good. If the amount of sodium alginate is less than 0.5 parts by weight with respect to 100 parts by weight of water, the effect of improving the releasability is small, and if it exceeds 5 parts by weight, the ceramic molded body has elasticity and shape retention. It is easy to lose sex
【００１０】[0010]
【実施例】以下、本発明の型内押出用可塑性材料を具体
化し、混練工程、型内押出工程によりセラミックス成形
体を得る実施例１、２を比較例１、２とともに図面を参
照しつつ説明する。 （実施例１） ｛混練工程｝まず、Ｓｉ3 Ｎ4 粉末（平均粒径０．２μ
ｍ）９ｋｇと、Ｙ2 Ｏ3 粉末（平均粒径０．２μｍ）６
００ｇと、ＭｇＡｌ2 Ｏ4 粉末（平均粒径０．２μｍ）
４００ｇとを用意する。Ｙ2 Ｏ3 粉末及びＭｇＡｌ2 Ｏ
4 粉末はＳｉ3 Ｎ4 粉末に対する焼結助剤である。これ
らをエタノール中で混粉後、目開き１０μｍの篩いを通
してセラミック粉末とした。EXAMPLES Examples 1 and 2 in which the plastic material for in-mold extrusion of the present invention is embodied and a ceramic molded body is obtained by a kneading step and an in-mold extrusion step will be described together with Comparative Examples 1 and 2 with reference to the drawings. To do. (Example 1) {Kneading step} First, Si 3 N 4 powder (average particle size 0.2 μ)
m) 9 kg and Y 2 O 3 powder (average particle size 0.2 μm) 6
00g and MgAl 2 O 4 powder (average particle size 0.2 μm)
Prepare 400 g. Y 2 O 3 powder and MgAl 2 O
4 powder is a sintering aid for Si 3 N 4 powder. These were mixed in ethanol and then passed through a sieve with a mesh opening of 10 μm to obtain a ceramic powder.
【００１１】セラミック粉末１００重量部に、水溶性結
合剤としてのメチルセルロース（信越化学（株）製ＳＭ
４０００）１重量部と、可塑剤としてのグリセリン１重
量部と、本実施例の特徴的な構成としてアルギン酸ナト
リウム０．２重量部とをそれぞれ水溶液として添加し、
加熱して水分を蒸発させるから充分混練機により混合・
混練し、水３６重量部となるように水分調整して型内押
出用可塑性材料を得る。なお、アルギン酸ナトリウムは
水１００重量部に対し、０．６重量部である。 ｛型内押出工程｝図１に示すように、この可塑性材料１
を押出シリンダ２内に充填する。また、図２に示すよう
に、ステム部直径８ｍｍ、全長１２０ｍｍ、傘部直径４
０ｍｍのバルブ形状のキャビティ３ａをもつ４分割の金
型３を用意する。100 parts by weight of ceramic powder were mixed with methyl cellulose (SM manufactured by Shin-Etsu Chemical Co., Ltd.) as a water-soluble binder.
4000) 1 part by weight, 1 part by weight of glycerin as a plasticizer, and 0.2 part by weight of sodium alginate as a characteristic constitution of this example are added as an aqueous solution,
Since it is heated to evaporate the water content, it is thoroughly mixed by a kneading machine.
The mixture is kneaded and the water content is adjusted to 36 parts by weight of water to obtain a plastic material for in-mold extrusion. The sodium alginate is 0.6 parts by weight with respect to 100 parts by weight of water. {In-mold extrusion step} As shown in FIG. 1, this plastic material 1
Is filled in the extrusion cylinder 2. In addition, as shown in FIG. 2, the stem diameter is 8 mm, the total length is 120 mm, and the umbrella diameter is 4.
A four-divided mold 3 having a 0 mm bulb-shaped cavity 3a is prepared.
【００１２】基台４とこの基台４に対して昇降可能な可
動台５との間に、これら押出シリンダ２、押出ピストン
６、金型３を挟持し、押出ピストン４を降下させること
により、押出シリンダ２の下端の開口から成形圧力５０
ＭＰａで可塑性材料１をキャビティ３ａ内に押出す。こ
うして、可塑性材料１をキャビティ３ａ内に充填・賦形
する。By sandwiching the extruding cylinder 2, the extruding piston 6, and the mold 3 between the base 4 and the movable table 5 which can be moved up and down with respect to the base 4, and lowering the extruding piston 4, From the opening at the lower end of the extrusion cylinder 2, a molding pressure of 50
The plastic material 1 is extruded into the cavity 3a at MPa. In this way, the plastic material 1 is filled and shaped in the cavity 3a.
【００１３】この後、金型３を一つづつ外したところ、
セラミックス成形体はキャビティ３ａ面に張りつかず、
かつ保形性も良好であり、キャビティ３ａから容易に脱
型できた。 （実施例２）アルギン酸ナトリウムを１重量部とした以
外は実施例１と同様に型内押出用可塑性材料を得る。な
お、アルギン酸ナトリウムは水１００重量部に対し、
３．０重量部である。After that, when the molds 3 were removed one by one,
The ceramic molded body does not stick to the surface of the cavity 3a,
In addition, the shape retaining property was also good, and the mold could be easily removed from the cavity 3a. (Example 2) A plastic material for in-mold extrusion is obtained in the same manner as in Example 1 except that 1 part by weight of sodium alginate is used. In addition, sodium alginate is 100 parts by weight of water,
3.0 parts by weight.
【００１４】この可塑性材料においても、セラミックス
成形体はキャビティ面に張りつかず、かつ保形性も良好
であり、キャビティから容易に脱型できた。 （比較例１）アルギン酸ナトリウムを添加しないこと以
外は実施例１と同様に型内押出用可塑性材料を得る。Also in this plastic material, the ceramic molded body did not stick to the cavity surface and had a good shape-retaining property, and could be easily released from the cavity. (Comparative Example 1) A plastic material for in-mold extrusion is obtained in the same manner as in Example 1 except that sodium alginate is not added.
【００１５】この可塑性材料では、キャビティ内への充
填は可能であったものの、キャビティ面に可塑性材料が
張りつき、セラミックス成形体の形状を崩さなければキ
ャビティから脱型ができなかった。 （比較例２）アルギン酸ナトリウムを０．１重量％とし
た以外は実施例１と同様に型内押出用可塑性材料を得
る。なお、アルギン酸ナトリウムは水１００重量部に対
し、０．３重量部である。With this plastic material, although it was possible to fill the inside of the cavity, the plastic material stuck to the surface of the cavity and the mold could not be released from the cavity unless the shape of the ceramic compact was destroyed. (Comparative Example 2) A plastic material for in-mold extrusion is obtained in the same manner as in Example 1 except that sodium alginate is 0.1% by weight. The sodium alginate is 0.3 part by weight with respect to 100 parts by weight of water.
【００１６】この可塑性材料では、比較例１よりも離型
性はよかったものの、実施例１、２の可塑性材料には及
ばなかった。したがって、実施例１、２の可塑性材料で
は、アルギン酸ナトリウムが水１００重量部に対して
０．６〜３重量部含まれており、脱型が容易であるとと
もに、保形性がよく、三次元であるバルブ形状のニアネ
ットシェイプセラミックス成形体を得ることができるこ
とがわかる。This plastic material had a better releasability than Comparative Example 1, but did not reach the plastic materials of Examples 1 and 2. Therefore, in the plastic materials of Examples 1 and 2, sodium alginate was contained in an amount of 0.6 to 3 parts by weight with respect to 100 parts by weight of water, which facilitates demolding, has good shape retention, and is three-dimensional. It can be seen that it is possible to obtain a valve-shaped near net shape ceramics molded body.
【００１７】なお、セラミック粉末としては、Ｓｉ3 Ｎ
4 粉末の他に、ＳｉＯ2 粉末、Ａｌ 2 Ｏ3 粉末等を採用
することができる。水はセラミック粉末１００体積％に
対して１００〜１３０体積％含有されることが好まし
い。水がセラミック粉末１００体積％に対して１００体
積％未満であれば、可塑性材料が粘土状になりにくい。
水がセラミック粉末１００体積％に対して１３０体積％
を超えれば、セラミックス成形体の保形性が悪い。水は
セラミック粉末１００体積％に対して１１０〜１２５体
積％含有されることがより好ましい。As the ceramic powder, Si is used.3N
FourIn addition to powder, SiO2Powder, Al 2O3Adopt powder etc.
can do. Water is 100% by volume of ceramic powder
On the other hand, it is preferable that the content is 100 to 130% by volume.
Yes. 100 bodies of water for 100% by volume of ceramic powder
If it is less than the product%, the plastic material is unlikely to be clay-like.
Water is 130% by volume with respect to 100% by volume of ceramic powder
If it exceeds, the shape retention of the ceramic molded body is poor. Water is
110-125 bodies to 100% by volume of ceramic powder
More preferably, it is contained in a volume percentage.
【００１８】水溶性結合剤としては、メチルセルロース
等のセルロース類の他に、でんぷん、デキストリン、に
かわ、カゼイン、ゼラチン等を採用することができる。
ここで、水溶性結合剤はセラミック粉末１００体積％に
対して１〜１５体積％含有されることが好ましい。水溶
性結合剤がセラミック粉末１００体積％に対して１体積
％未満であれば、セラミックス成形体が乾燥後にクラッ
クを生じやすい。水溶性結合剤がセラミック粉末１００
体積％に対して１５．０体積％を超えれば、水溶性結合
剤が凝集しやすく、焼結後のセラミックに強度欠陥が生
じやすい。As the water-soluble binder, starch, dextrin, glue, casein, gelatin and the like can be adopted in addition to celluloses such as methyl cellulose.
Here, the water-soluble binder is preferably contained in an amount of 1 to 15% by volume based on 100% by volume of the ceramic powder. If the water-soluble binder is less than 1% by volume with respect to 100% by volume of the ceramic powder, the ceramic molded body tends to crack after drying. Water-soluble binder is 100 ceramic powder
If it exceeds 15.0% by volume with respect to the volume%, the water-soluble binder is likely to agglomerate and a strength defect is likely to occur in the sintered ceramic.
【００１９】可塑性材料には分散剤を含有させることが
できる。分散剤としては、ポリカルボン酸アンモニウム
塩、アクリル酸オリゴマーＮＨ4 塩、ポリアクリル酸ソ
ーダ、アクリル酸７０重量％とアクリル酸メチル３０重
量％の共重合体オリゴマーＮＨ4 塩などを採用すること
ができる。ここで、分散剤はセラミック粉末１００体積
％に対して１〜８体積％含有されることが好ましい。分
散剤がセラミック粉末１００体積％に対して１体積％未
満であれば、可塑性材料中でセラミック粉末が分散され
にくい。分散剤がセラミック粉末１００体積％に対して
８．０体積％を超えれば、可塑性が高く、適度な粘土状
の可塑性材料が得られにくい。The plastic material may contain a dispersant. As the dispersant, polycarboxylic acid ammonium salt, acrylic acid oligomer NH 4 salt, polyacrylic acid soda, copolymer oligomer NH 4 salt of 70% by weight of acrylic acid and 30% by weight of methyl acrylate, and the like can be adopted. . Here, the dispersant is preferably contained in an amount of 1 to 8% by volume with respect to 100% by volume of the ceramic powder. When the dispersant is less than 1% by volume with respect to 100% by volume of the ceramic powder, the ceramic powder is less likely to be dispersed in the plastic material. If the dispersant exceeds 8.0% by volume with respect to 100% by volume of the ceramic powder, the plasticity is high and it is difficult to obtain an appropriate clay-like plastic material.
【００２０】可塑性材料の押出圧力、押出速度、押出時
間等は、可塑性材料のチクソトロピー性、キャビティの
形状により選択され得る。The extrusion pressure, extrusion speed, extrusion time and the like of the plastic material can be selected depending on the thixotropy of the plastic material and the shape of the cavity.
【００２１】[0021]
【発明の効果】以上詳述したように、本発明の可塑性材
料では、特許請求の範囲記載の構成を採用しているた
め、優れた離型性の下、三次元形状のニアネットシェイ
プセラミックス成形体を得ることができる。As described in detail above, since the plastic material of the present invention has the constitution described in the claims, it is possible to form a three-dimensional shape near net shape ceramics with excellent releasability. You can get the body.
【図１】実施例１、２及び比較例１、２の成形方法の工
程を示す模式断面図である。FIG. 1 is a schematic cross-sectional view showing a step of a molding method of Examples 1 and 2 and Comparative Examples 1 and 2.
【図２】図１のＡ−Ａ矢視断面図である。FIG. 2 is a sectional view taken along the line AA of FIG.
３ａ…キャビティ １…型内押出用可
塑性材料3a ... Cavity 1 ... In-mold extrusion plastic material
Claims (1)
出の際の圧力により該キャビティ内に充填されるととも
に該キャビティで賦形されるセラミック粉末、水及び水
溶性結合剤を含む型内押出用可塑性材料であって、 前記型内押出用可塑性材料はアルギン酸ナトリウムを含
むことを特徴とする型内押出用可塑性材料。1. In-mold extrusion including a ceramic powder, water and a water-soluble binder, which is extruded into a cavity having a three-dimensional shape, is filled in the cavity by pressure during extrusion, and is shaped in the cavity. A plastic material for in-mold extrusion, wherein the plastic material for in-mold extrusion contains sodium alginate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4270395A JPH06116012A (en) | 1992-10-08 | 1992-10-08 | In-mold extrusion plastic material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4270395A JPH06116012A (en) | 1992-10-08 | 1992-10-08 | In-mold extrusion plastic material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06116012A true JPH06116012A (en) | 1994-04-26 |
Family
ID=17485666
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4270395A Pending JPH06116012A (en) | 1992-10-08 | 1992-10-08 | In-mold extrusion plastic material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06116012A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011524846A (en) * | 2008-06-19 | 2011-09-08 | ダウ グローバル テクノロジーズ エルエルシー | Additives containing cellulose ether for ceramic extrusion |
| JP2013241310A (en) * | 2012-05-22 | 2013-12-05 | Denso Corp | Plastic molding composition and baked product |
| JP2013241311A (en) * | 2012-05-22 | 2013-12-05 | Denso Corp | Plastic molding composition and baked product |
-
1992
- 1992-10-08 JP JP4270395A patent/JPH06116012A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011524846A (en) * | 2008-06-19 | 2011-09-08 | ダウ グローバル テクノロジーズ エルエルシー | Additives containing cellulose ether for ceramic extrusion |
| JP2013241310A (en) * | 2012-05-22 | 2013-12-05 | Denso Corp | Plastic molding composition and baked product |
| JP2013241311A (en) * | 2012-05-22 | 2013-12-05 | Denso Corp | Plastic molding composition and baked product |
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