JPH04338155A - Ceramic composition for injection molding - Google Patents
Ceramic composition for injection moldingInfo
- Publication number
- JPH04338155A JPH04338155A JP3135916A JP13591691A JPH04338155A JP H04338155 A JPH04338155 A JP H04338155A JP 3135916 A JP3135916 A JP 3135916A JP 13591691 A JP13591691 A JP 13591691A JP H04338155 A JPH04338155 A JP H04338155A
- Authority
- JP
- Japan
- Prior art keywords
- acid
- injection molding
- ceramic
- unsaturated carboxylic
- thermoplastic resin
- 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
- 239000000919 ceramic Substances 0.000 title claims abstract description 23
- 238000001746 injection moulding Methods 0.000 title claims abstract description 17
- 239000000203 mixture Substances 0.000 title claims description 15
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 20
- -1 polyethylene Polymers 0.000 claims abstract description 8
- 229910010293 ceramic material Inorganic materials 0.000 claims abstract description 7
- 239000004698 Polyethylene Substances 0.000 claims abstract description 5
- 229920000573 polyethylene Polymers 0.000 claims abstract description 5
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims abstract description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229920000642 polymer Polymers 0.000 claims abstract description 3
- 150000001732 carboxylic acid derivatives Chemical class 0.000 claims description 17
- 239000000843 powder Substances 0.000 claims description 7
- GHVNFZFCNZKVNT-UHFFFAOYSA-N decanoic acid Chemical compound CCCCCCCCCC(O)=O GHVNFZFCNZKVNT-UHFFFAOYSA-N 0.000 claims description 4
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 claims description 4
- IPCSVZSSVZVIGE-UHFFFAOYSA-N hexadecanoic acid Chemical compound CCCCCCCCCCCCCCCC(O)=O IPCSVZSSVZVIGE-UHFFFAOYSA-N 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 235000020661 alpha-linolenic acid Nutrition 0.000 claims description 3
- 229960004488 linolenic acid Drugs 0.000 claims description 3
- KQQKGWQCNNTQJW-UHFFFAOYSA-N linolenic acid Natural products CC=CCCC=CCC=CCCCCCCCC(O)=O KQQKGWQCNNTQJW-UHFFFAOYSA-N 0.000 claims description 3
- OYHQOLUKZRVURQ-NTGFUMLPSA-N (9Z,12Z)-9,10,12,13-tetratritiooctadeca-9,12-dienoic acid Chemical compound C(CCCCCCC\C(=C(/C\C(=C(/CCCCC)\[3H])\[3H])\[3H])\[3H])(=O)O OYHQOLUKZRVURQ-NTGFUMLPSA-N 0.000 claims description 2
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 claims description 2
- TWJNQYPJQDRXPH-UHFFFAOYSA-N 2-cyanobenzohydrazide Chemical compound NNC(=O)C1=CC=CC=C1C#N TWJNQYPJQDRXPH-UHFFFAOYSA-N 0.000 claims description 2
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 claims description 2
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 claims description 2
- 239000005632 Capric acid (CAS 334-48-5) Substances 0.000 claims description 2
- 239000005639 Lauric acid Substances 0.000 claims description 2
- 235000021360 Myristic acid Nutrition 0.000 claims description 2
- TUNFSRHWOTWDNC-UHFFFAOYSA-N Myristic acid Natural products CCCCCCCCCCCCCC(O)=O TUNFSRHWOTWDNC-UHFFFAOYSA-N 0.000 claims description 2
- 239000005642 Oleic acid Substances 0.000 claims description 2
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 claims description 2
- 235000021314 Palmitic acid Nutrition 0.000 claims description 2
- 239000004793 Polystyrene Substances 0.000 claims description 2
- 235000021355 Stearic acid Nutrition 0.000 claims description 2
- DTOSIQBPPRVQHS-PDBXOOCHSA-N alpha-linolenic acid Chemical compound CC\C=C/C\C=C/C\C=C/CCCCCCCC(O)=O DTOSIQBPPRVQHS-PDBXOOCHSA-N 0.000 claims description 2
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 claims description 2
- 125000004432 carbon atom Chemical group C* 0.000 claims description 2
- 229920001577 copolymer Polymers 0.000 claims description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 2
- 229920001903 high density polyethylene Polymers 0.000 claims description 2
- 239000004700 high-density polyethylene Substances 0.000 claims description 2
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 claims description 2
- 229920001684 low density polyethylene Polymers 0.000 claims description 2
- 239000004702 low-density polyethylene Substances 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- WQEPLUUGTLDZJY-UHFFFAOYSA-N n-Pentadecanoic acid Natural products CCCCCCCCCCCCCCC(O)=O WQEPLUUGTLDZJY-UHFFFAOYSA-N 0.000 claims description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 2
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 claims description 2
- 235000021313 oleic acid Nutrition 0.000 claims description 2
- 229920001490 poly(butyl methacrylate) polymer Polymers 0.000 claims description 2
- 229920001483 poly(ethyl methacrylate) polymer Polymers 0.000 claims description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 2
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 2
- 229920002223 polystyrene Polymers 0.000 claims description 2
- 239000008117 stearic acid Substances 0.000 claims description 2
- 239000001993 wax Substances 0.000 claims description 2
- 239000011230 binding agent Substances 0.000 abstract description 12
- 238000000465 moulding Methods 0.000 abstract description 9
- 150000001735 carboxylic acids Chemical class 0.000 abstract description 3
- 238000005238 degreasing Methods 0.000 description 12
- 239000002994 raw material Substances 0.000 description 10
- 238000004898 kneading Methods 0.000 description 7
- 230000007547 defect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 239000007822 coupling agent Substances 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- ZLWSWTKSTUPKDY-UHFFFAOYSA-K 16-methylheptadecanoate;propan-2-olate;titanium(4+) Chemical compound [Ti+4].CC(C)[O-].CC(C)CCCCCCCCCCCCCCC([O-])=O.CC(C)CCCCCCCCCCCCCCC([O-])=O.CC(C)CCCCCCCCCCCCCCC([O-])=O ZLWSWTKSTUPKDY-UHFFFAOYSA-K 0.000 description 1
- 150000003973 alkyl amines Chemical group 0.000 description 1
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 125000005481 linolenic acid group Chemical group 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000010137 moulding (plastic) Methods 0.000 description 1
- 239000000088 plastic resin Substances 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は例えば４ＧＨｚ帯用の誘
電体共振器などに用いられ、複雑な形状を有する生成形
体を容易に製造することのできる射出成形用セラミック
組成物に関するものである。
【０００２】
【従来の技術】近年 セラミックは構造用のみならず
、誘電体、圧電体、磁性体などの電子部品用セラミック
スとしての応用に用途が拡大している。このような用途
の場合、その形状は従来にない複雑なものが要求される
。
従来の主たる成形方法である乾式プレスでは、粉体に加
わる圧縮応力の不均一や粉体間の摩擦による圧力損失な
どにより、均一な成形密度の成形体を得ることが困難で
、その結果、所望の寸法精度を有しかつ均一な焼結密度
を有する焼成体を得ることができなかった。また成形可
能な形状も単純な形状に限定されている。それ故に、焼
成後研削などの後加工が必要である場合が多く、コスト
アップの要因となっている。この粉体プレス成形法以外
にも押し出し成形，鋳込み成形などの方法もあるが、形
状が限定されたり寸法精度が悪いなど問題が多い。
【０００３】これらの成形法に対し、射出成形法はそれ
自体プラスチック成形では周知の技術であり、複雑な形
状のものを寸法精度よく製作できるため、市場の要求に
応えることが可能である。
【０００４】
【発明が解決しようとする課題】ところが、射出成形法
では成形時の流動性を得るため、３５〜５０ｖｏｌ％程
度の熱可塑性樹脂、つまりバインダーを使用する必要が
あった。その結果、成形品にクラック、ブクなどの欠陥
が生じやすく、これを防止するには通常５００℃までを
２℃／ｈｒの昇温速度でゆっくり脱脂する必要があった
。そのため、脱脂工程に１００〜２００時間もの長時間
を要し、コスト的に非常に不利であるという問題があっ
た。
【０００５】そこで、本発明の目的は、成形時の流動性
を維持したままでバインダーを削減する事により、脱脂
時間を短縮できる射出成形用セラミック組成物を提供す
ることにある。
【０００６】
【課題を解決するための手段】本発明は、主としてセラ
ミック材料と熱可塑性樹脂とを含む射出成形用組成物で
ある。前記熱可塑性樹脂はバインダーとして機能させる
ため、ポリエチレン，ワックス，アクリル酸およびそれ
らの誘導体の中から選ばれる少なくとも一種の重合体を
用いる。この組成物には解膠剤として不飽和カルボン酸
が添加されている。
【０００７】このような組成物を用いたセラミックスの
製造は次のようにして行われる。まず、セラミック原料
とバインダー（熱可塑性樹脂）と解膠剤（不飽和カルボ
ン酸）とを混練トルクが一定になるまで十分混練する。
次に、混練物をペレタイザーなどの押出造粒機により押
し出し後、カットし、射出成形用原料とする。この原料
を射出成形機により通常の成形条件で成形し、生成形体
を得る。この生成形体はゆるやかな昇温速度によりバイ
ンダーが完全に飛散する温度、すなわち５００℃まで昇
温する。次に所定の焼成温度で焼成し、完成品を得る。
【０００８】本発明では解膠剤を予めセラミック原料に
加える事により、セラミック原料と熱可塑性樹脂との親
和性を増し、少ない熱可塑性樹脂量で射出成形可能な流
動性の良いセラミック粉体と熱可塑性樹脂との混合物を
得た。この技術により、熱可塑性樹脂を従来に比べて大
幅に削減でき、脱脂時間を短縮すると共に脱脂時の欠陥
を大幅に低下させる事ができた。
【０００９】セラミック材料としては、粒子径０．５〜
１０μｍのセラミック粉体を使用するのが望ましい。こ
れは、射出成形用の混練物を得る際に粒子径が大きすぎ
ると、バインダーと十分に混練しにくいからである。
【００１０】また、熱可塑性樹脂および不飽和カルボン
酸の配合量はセラミック６５〜７５容量部に対して２５
〜３５容量部の範囲内とするのが、脱脂時間を短縮し、
脱脂時の欠陥を低下させるのに効果的である。
【００１１】さらに、不飽和カルボン酸の添加量は０．
５〜２．０重量％の範囲にするのが望ましい。その理由
は、０．５重量％未満では流動性の向上に効果がなく、
２．０重量％を越えると、脱脂時にフクレ等の欠陥が生
じるからである。
【００１２】熱可塑性樹脂としては、具体的にはワック
ス，低密度ポリエチレン，高密度ポリエチレン，ポリメ
タクリル酸メチル，ポリメタクリル酸エチル，ポリメタ
クリル酸ブチル，エチレン酢酸ビニール，ポリエチレン
，ポリスチレンなどの単体またはそれらの共重合体が使
用可能である。
【００１３】また、前記不飽和カルボン酸としては、パ
ルミチン酸，ステアリン酸，オレイン酸，リノール酸，
リノレン酸，カプリン酸，ラウリン酸，ミリスチン酸な
どの炭素数１０〜１８の不飽和カルボン酸のうち少なく
とも一種が使用可能である。
【００１４】
【実施例】平均粒径０．６μｍのチタン酸バリウムを原
料とし、ワックスバインダーを用い加圧ニーダーで不飽
和カルボン酸と共に混練する。この不飽和カルボン酸の
効果を加圧ニーダーの混練トルクにより評価したところ
、表１のようになった。なお、加圧ニーダーの混練トル
クは、混練用回転羽根の駆動軸に直結されたトルクセン
サーからの電気信号から知ることができる。ここでは、
解膠剤として不飽和カンボン酸およびそれと比較するた
めにアミン系化合物、チタンカップリング剤を使用し、
これらの評価結果を示す。
【００１５】
【表１】
【００１６】ここで、各々の解膠剤は
不飽和カンボン酸としてリノレン酸を、アミン系化合物
として二級アルキルアミンを、チタンカップリング剤と
してイソプロポキシチタントリイソステアレートを用い
た。この様に解膠剤として不飽和カンボン酸を添加する
と、大幅に混練トルクが低下し、成形時の流動性が改善
される事が分かる。なお、チタンカップリング剤もトル
ク低下に効果があるが、吸湿性があるため、原料に微量
水分が含まれていると、その効果が安定しないという欠
点がある。また、解膠剤は０．５％未満ではトルクの低
下に効果がなく、また２．０％以上加えた場合は脱脂時
にフクレが生じると言う問題が出る。そのため、解膠剤
の添加量は０．５〜２．０ｗｔ％の範囲が望ましい。
【００１７】つぎに、解膠剤の中で最も効果のある不飽
和カンボン酸を用いて、バインダーを削減した時の加圧
ニーダーによる混練トルクは表２のようになった。
【表２】
ここで、成形性とは金型内に原料が充填した割合を
示し、×，△は未充填、○は充填したがウエルドライン
などの欠陥があるもの、◎は完全に充填し良品であるも
のをそれぞれ示す。
【００１８】前記のように解膠剤を使用しない場合は、
成形可能なコンパウンドを得るために必要なバインダー
量は４５ｖｏｌ％であったが、解膠剤を添加する事によ
り２９ｖｏｌ％まで削減する事ができる。その結果、昇
温速度を１０℃／ｈｒと速くし脱脂時間を短縮した条件
において、表３に示す様に高い良品率となった。
【表３】
【００１９】この結果から明らかなように
、解膠剤として不飽和カンボン酸を用いる事により、バ
インダー量を削減でき、従来より短時間の脱脂で高い良
品率を得ることができたことがわかる。
【００２０】なお、この解膠剤はワックスバインダーを
使用した場合のみならず、他の熱可塑性樹脂に対しても
混練トルクを低下させる効果が大きく、その例を表４に
示す。
【表４】
【００２１】
【発明の効果】以上の説明で明らかなように、本発明に
よれば、不飽和カルボン酸をセラミック原料に添加する
ことにより、セラミック原料と熱可塑性樹脂との親和性
が増し、少ない熱可塑性樹脂量で射出成形可能な流動性
の良いセラミック粉体と熱可塑性樹脂との混合物を得る
ことができる。その結果、脱脂時間を従来に比べて大幅
に短縮できるとともに、脱脂時の欠陥を低下させる事が
できた。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is an injection molding method that can be used, for example, in a dielectric resonator for the 4 GHz band, and can easily produce a shaped body having a complicated shape. The present invention relates to a ceramic composition for molding. [0002] In recent years, ceramics have been used not only for structural purposes, but also for use as ceramics for electronic components such as dielectrics, piezoelectrics, and magnetic materials. For such uses, the shape is required to be more complex than ever before. In dry pressing, which is the main conventional forming method, it is difficult to obtain a compact with uniform compaction density due to uneven compressive stress applied to the powder and pressure loss due to friction between the powder. It was not possible to obtain a fired body having a dimensional accuracy of 1 and a uniform sintered density. In addition, shapes that can be molded are also limited to simple shapes. Therefore, post-processing such as grinding after firing is often required, which is a factor in increasing costs. In addition to this powder press molding method, there are other methods such as extrusion molding and casting molding, but these have many problems such as limited shapes and poor dimensional accuracy. [0003] In contrast to these molding methods, injection molding is itself a well-known technology for plastic molding, and can meet market demands because it can manufacture products with complex shapes with high dimensional accuracy. [0004] However, in the injection molding method, in order to obtain fluidity during molding, it is necessary to use about 35 to 50 vol% of a thermoplastic resin, that is, a binder. As a result, defects such as cracks and voids are likely to occur in the molded product, and in order to prevent this, it is usually necessary to degrease slowly up to 500° C. at a temperature increase rate of 2° C./hr. Therefore, there was a problem in that the degreasing process required a long time of 100 to 200 hours, which was extremely disadvantageous in terms of cost. [0005] Accordingly, an object of the present invention is to provide a ceramic composition for injection molding which can shorten degreasing time by reducing the amount of binder while maintaining fluidity during molding. SUMMARY OF THE INVENTION The present invention is an injection molding composition primarily comprising a ceramic material and a thermoplastic resin. Since the thermoplastic resin functions as a binder, at least one polymer selected from polyethylene, wax, acrylic acid, and derivatives thereof is used. An unsaturated carboxylic acid is added to this composition as a deflocculant. Production of ceramics using such a composition is carried out as follows. First, a ceramic raw material, a binder (thermoplastic resin), and a deflocculant (unsaturated carboxylic acid) are sufficiently kneaded until the kneading torque becomes constant. Next, the kneaded material is extruded using an extrusion granulator such as a pelletizer, and then cut to obtain a raw material for injection molding. This raw material is molded using an injection molding machine under normal molding conditions to obtain a product. This formed body is heated at a slow heating rate to a temperature at which the binder is completely dispersed, that is, 500°C. Next, it is fired at a predetermined firing temperature to obtain a finished product. In the present invention, by adding a deflocculant to the ceramic raw material in advance, the affinity between the ceramic raw material and the thermoplastic resin is increased, and the fluidity of the ceramic powder and heat, which can be injection molded with a small amount of thermoplastic resin, is increased. A mixture with plastic resin was obtained. With this technology, we were able to significantly reduce the amount of thermoplastic resin used compared to conventional methods, shorten degreasing time, and significantly reduce defects during degreasing. [0009] As a ceramic material, the particle size is 0.5~
Preferably, a 10 μm ceramic powder is used. This is because when obtaining a kneaded material for injection molding, if the particle size is too large, it will be difficult to sufficiently knead it with the binder. [0010] The blending amount of the thermoplastic resin and unsaturated carboxylic acid is 25 to 75 parts by volume of the ceramic.
~35 parts by volume will shorten the degreasing time,
Effective in reducing defects during degreasing. Furthermore, the amount of unsaturated carboxylic acid added is 0.
It is desirable that the content be in the range of 5 to 2.0% by weight. The reason is that if it is less than 0.5% by weight, it is not effective in improving fluidity.
This is because if it exceeds 2.0% by weight, defects such as blistering will occur during degreasing. Examples of thermoplastic resins include wax, low density polyethylene, high density polyethylene, polymethyl methacrylate, polyethyl methacrylate, polybutyl methacrylate, ethylene vinyl acetate, polyethylene, polystyrene, etc., or single substances thereof. Copolymers of can be used. [0013] The unsaturated carboxylic acids include palmitic acid, stearic acid, oleic acid, linoleic acid,
At least one of unsaturated carboxylic acids having 10 to 18 carbon atoms such as linolenic acid, capric acid, lauric acid, and myristic acid can be used. [Example] Barium titanate having an average particle size of 0.6 μm is used as a raw material, and is kneaded with an unsaturated carboxylic acid in a pressure kneader using a wax binder. When the effect of this unsaturated carboxylic acid was evaluated by the kneading torque of a pressure kneader, the results were as shown in Table 1. The kneading torque of the pressure kneader can be determined from an electrical signal from a torque sensor directly connected to the drive shaft of the rotary kneading blade. here,
Using unsaturated carboxylic acid as a peptizing agent and an amine compound and a titanium coupling agent for comparison,
The results of these evaluations are shown below. [Table 1] Here, each peptizer is
Linolenic acid was used as the unsaturated carboxylic acid, secondary alkylamine was used as the amine compound, and isopropoxytitanium triisostearate was used as the titanium coupling agent. It can be seen that when unsaturated carboxylic acid is added as a deflocculant, the kneading torque is significantly reduced and the fluidity during molding is improved. Note that titanium coupling agents are also effective in reducing torque, but because they are hygroscopic, they have the disadvantage that their effects are unstable if the raw materials contain trace amounts of water. Furthermore, if the deflocculant is less than 0.5%, it will not be effective in reducing torque, and if it is added in an amount of 2.0% or more, there will be a problem that blistering will occur during degreasing. Therefore, the amount of deflocculant added is preferably in the range of 0.5 to 2.0 wt%. Next, Table 2 shows the kneading torque using a pressure kneader when the binder was reduced by using unsaturated carboxylic acid, which is the most effective peptizer. [Table 2] Here, moldability indicates the rate at which the raw material is filled into the mold, × and △ are not filled, ○ is filled but there are defects such as weld lines, and ◎ is completely filled. Indicates each item that is of good quality. [0018] When no deflocculant is used as mentioned above,
The amount of binder required to obtain a moldable compound was 45 vol%, but it can be reduced to 29 vol% by adding a deflocculant. As a result, as shown in Table 3, a high yield rate was obtained under conditions where the temperature increase rate was increased to 10° C./hr and the degreasing time was shortened. [Table 3] As is clear from this result, by using unsaturated carboxylic acid as a deflocculant, the amount of binder could be reduced and a higher yield rate could be obtained with shorter degreasing time than before. I understand that. [0020] This deflocculant has a great effect of reducing the kneading torque not only when a wax binder is used, but also when using other thermoplastic resins, and examples thereof are shown in Table 4. [Table 4] [Effects of the Invention] As is clear from the above explanation, according to the present invention, by adding an unsaturated carboxylic acid to the ceramic raw material, the affinity between the ceramic raw material and the thermoplastic resin is improved. It is possible to obtain a mixture of ceramic powder and thermoplastic resin with good fluidity that can be injection molded with a small amount of thermoplastic resin. As a result, the degreasing time could be significantly shortened compared to the conventional method, and defects during degreasing could be reduced.
Claims (6)
脂とを含む射出成形用組成物であって、前記熱可塑性樹
脂はポリエチレン，ワックス，アクリル酸およびそれら
の誘導体の中から選ばれる少なくとも一種の重合体より
なり、これらセラミック材料および熱可塑性樹脂に対し
て不飽和カルボン酸が添加されていることを特徴とする
射出成形用セラミック組成物。1. An injection molding composition mainly comprising a ceramic material and a thermoplastic resin, wherein the thermoplastic resin is at least one polymer selected from polyethylene, wax, acrylic acid, and derivatives thereof. A ceramic composition for injection molding, characterized in that an unsaturated carboxylic acid is added to these ceramic materials and thermoplastic resins.
１０μｍのセラミック粉体であることを特徴とする請求
項１に記載の射出成形用セラミック組成物。2. The ceramic material has a particle size of 0.5 to
The ceramic composition for injection molding according to claim 1, characterized in that it is a 10 μm ceramic powder.
ン酸の配合量はセラミック材料６５〜７５容量部に対し
て２５〜３５容量部の範囲内である請求項１または２に
記載の射出成形用セラミック組成物。3. The ceramic for injection molding according to claim 1, wherein the blending amount of the thermoplastic resin and the unsaturated carboxylic acid is within a range of 25 to 35 parts by volume based on 65 to 75 parts by volume of the ceramic material. Composition.
５〜２．０重量％の範囲である請求項１〜３のいずれか
に記載の射出成形用セラミック組成物。4. The amount of the unsaturated carboxylic acid added is 0.
The ceramic composition for injection molding according to any one of claims 1 to 3, wherein the content is in the range of 5 to 2.0% by weight.
ポリエチレン，高密度ポリエチレン，ポリメタクリル酸
メチル，ポリメタクリル酸エチル，ポリメタクリル酸ブ
チル，エチレン酢酸ビニール，ポリエチレン，ポリスチ
レンなどの単体またはそれらの共重合体である請求項１
〜４のいずれかに記載の射出成形用セラミック組成物。5. The thermoplastic resin may be wax, low density polyethylene, high density polyethylene, polymethyl methacrylate, polyethyl methacrylate, polybutyl methacrylate, ethylene vinyl acetate, polyethylene, polystyrene, etc., or a copolymer thereof. Claim 1 which is a combination
The ceramic composition for injection molding according to any one of items 1 to 4.
，ステアリン酸，オレイン酸，リノール酸，リノレン酸
，カプリン酸，ラウリン酸，ミリスチン酸などの炭素数
１０〜１８の不飽和カルボン酸のうち少なくとも一種で
ある請求項１〜５のいずれかに記載の射出成形用セラミ
ック組成物。6. The unsaturated carboxylic acid is at least one type of unsaturated carboxylic acid having 10 to 18 carbon atoms such as palmitic acid, stearic acid, oleic acid, linoleic acid, linolenic acid, capric acid, lauric acid, and myristic acid. The ceramic composition for injection molding according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3135916A JPH04338155A (en) | 1991-05-10 | 1991-05-10 | Ceramic composition for injection molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3135916A JPH04338155A (en) | 1991-05-10 | 1991-05-10 | Ceramic composition for injection molding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04338155A true JPH04338155A (en) | 1992-11-25 |
Family
ID=15162843
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3135916A Pending JPH04338155A (en) | 1991-05-10 | 1991-05-10 | Ceramic composition for injection molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04338155A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010285561A (en) * | 2009-06-12 | 2010-12-24 | Sumitomo Metal Mining Co Ltd | Composition for injection molding |
-
1991
- 1991-05-10 JP JP3135916A patent/JPH04338155A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010285561A (en) * | 2009-06-12 | 2010-12-24 | Sumitomo Metal Mining Co Ltd | Composition for injection molding |
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