JP2008081715A - Pencil lead - Google Patents

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JP2008081715A
JP2008081715A JP2006325070A JP2006325070A JP2008081715A JP 2008081715 A JP2008081715 A JP 2008081715A JP 2006325070 A JP2006325070 A JP 2006325070A JP 2006325070 A JP2006325070 A JP 2006325070A JP 2008081715 A JP2008081715 A JP 2008081715A
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weight
parts
mica
graphite
pencil lead
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Kunihiko Ishizuka
石塚久二彦
Katsuo Deguchi
出口勝男
Jun Yoshimori
潤 吉森
Hiroaki Okabayashi
岡林宏明
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Pentel Co Ltd
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Pentel Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a pencil lead having a practical anti-breaking strength and exhibiting a pure black color different from that of a conventional written mark of a pencil lead having reflection of lights which is made of graphite. <P>SOLUTION: At least an organic binder, body materials and other starting materials are blended and extruded into a fine linear structured article, followed by calcinations, wherein mica and graphite of the formula XmYn(ZSi<SB>3</SB>O<SB>10</SB>)F<SB>2</SB>(in which X is one or more member selected from the group consisting of Na, K, Li, Ca, Rb and Sr, m is 1/3 to 1, Y is one or more member selected from the group consisting of Mg, Fe, Ni, Mn, Al, Li, Co, Ti and Zn, n is 2 to 3, Z is at least one 3-valent cation selected from Al, Fe and B) are used as the body materials, whereby a calcined pencil lead is prepared. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、少なくとも有機結合材と体質材とを、混練、細線状に押出成形後、焼成処理を施してなる焼成鉛筆芯に関する。   The present invention relates to a fired pencil lead formed by kneading and extruding at least an organic binder and an extender material into a thin wire shape, followed by firing treatment.

焼成鉛筆芯体質材の主成分として黒鉛が使用されている。黒鉛には特有の反射光沢があるため、筆跡が鉛色に見えていた。そこで焼成鉛筆芯の筆跡を純黒に近づける為に、例えば、特公昭42−007166号公報(特許文献1)に記載の発明では、天然雲母粉末を使用したものが、特開昭54−088423号公報(特許文献2)に記載の発明では、タルクを使用したものが示されている。また、特開平8−239618号公報には、合成金雲母のみを体質材とした合成画用木炭が示されている(特許文献3)。
特公昭42−007166号公報 特開昭54−088423号公報 特開平8−239618号公報
Graphite is used as the main component of the fired pencil core material. Graphite had a unique reflective luster, so the handwriting looked lead-colored. Therefore, in order to make the handwriting of the baked pencil lead close to pure black, for example, in the invention described in Japanese Patent Publication No. 42-007166 (Patent Document 1), Japanese Patent Application Laid-Open No. 54-088423 uses natural mica powder. In the invention described in the publication (Patent Document 2), the one using talc is shown. Japanese Patent Application Laid-Open No. 8-239618 discloses synthetic charcoal using only synthetic phlogopite as an extender (Patent Document 3).
Japanese Patent Publication No.42-007166 Japanese Patent Laid-Open No. 54-088423 JP-A-8-239618

雲母やタルクを使用すると、雲母やタルク表面にカーボンブッラク等の着色剤や樹脂炭化物が被覆されるため、純黒に近い芯体を得ることができる。特許文献1にて開示されている天然雲母また、特許文献2にて開示されているタルクは、1000℃以上で焼成すると、脱水反応による結晶が分解され雲母やタルク特有の平滑性がなくなってしまい摩耗量が減り薄い筆記線しか得られなかった。そのため1000℃未満でしか焼成ができなかった。よって焼成後の骨格を繋ぐバインダーとなる樹脂などの炭化物が十分に結合力を発揮せず、折損強度が低く折れやい芯となってしまった。また、特許文献3に開示されているような、1000℃以上の耐熱性を有する合成金雲母のみを体質材とした合成画用木炭は、合成雲母表面に焼成炭化物が付着し純黒の筆跡を形成できる。しかし、合成画用木炭という比較的大きな塊で使用されるものであるのでも問題なく使用できるのであろうが、合成金雲母のみを体質材として使用すると、緻密な芯体にできず、鉛筆芯やシャープペンシル用替芯のような0.3mm〜2.0mm程度の細線状に成形すると折れやすくいものになる。また、合成金雲母は、結晶層の剥離強度が比較的高いので潤滑性に乏しく、押し出し成形時にノズルとの抵抗が大きくなり鉛筆芯の表面がざらつき易くなるといった外観上の問題も発生してしまう。
本発明の目的は、黒く、折れ難く、更に、表面が滑らかな鉛筆芯を得ることである。
When mica or talc is used, a mica or talc surface is coated with a colorant such as carbon black or a resin carbide, so that a core close to pure black can be obtained. The natural mica disclosed in Patent Document 1 and the talc disclosed in Patent Document 2 are decomposed by the dehydration reaction when calcined at 1000 ° C. or higher, and the smoothness peculiar to mica and talc is lost. The amount of wear decreased and only a thin writing line was obtained. Therefore, firing was possible only at temperatures below 1000 ° C. Therefore, a carbide such as a resin that serves as a binder for connecting the skeleton after firing does not exhibit sufficient bonding strength, and the fracture strength is low and the core is easily broken. In addition, as disclosed in Patent Document 3, charcoal for synthetic drawing using only synthetic phlogopite having a heat resistance of 1000 ° C. or higher as an extender, burned carbide adheres to the surface of the synthetic mica, and a pure black handwriting is obtained. Can be formed. However, although it can be used without problems even though it is used in relatively large chunks of synthetic painting charcoal, if only synthetic phlogopite is used as a constitution material, it cannot be made into a dense core, and a pencil core. If it is formed into a thin wire of about 0.3 mm to 2.0 mm, such as an extra lead for mechanical pencils, it becomes easy to break. In addition, the synthetic phlogopite has a relatively high peeling strength of the crystal layer, so it has poor lubricity, and the resistance to the nozzle during extrusion molding increases and the surface of the pencil core is likely to be rough. .
An object of the present invention is to obtain a pencil lead that is black, hard to break, and has a smooth surface.

本発明は、少なくとも有機結合材と体質材とを原材料として使用し、混練した原材料を細線状に押出成形後、焼成処理を施してなる鉛筆芯において、体質材として下記一般式(数1)で示される雲母と黒鉛を少なくとも使用する焼成鉛筆芯を要旨とする。   The present invention uses at least an organic binder and an extender as raw materials, and extrudes the kneaded raw material into a thin line shape, and then performs a baking treatment. The gist is a fired pencil lead using at least the mica and graphite shown.

上記(数1)で示される雲母は、黒鉛と同様な薄片状であるので、黒鉛と併用し押出成形すると黒鉛と同一方向に配向されるようになり緻密な芯体になる。よって、1000℃以上の焼成により、芯体の骨格も強固となり、折れ難い芯体となるものと推察される。また、上記(数1)で示される雲母は、1100℃まで結晶が保持されるので、約1000℃〜1100℃で焼成して芯体を得ると、雲母の結晶が保持されたままで、その表面に付着した有機結合材が十分に焼成し、配向した黒鉛と(数1)で示される雲母表面に純黒の炭化物として付着し純黒の筆跡と良好な書き味が得られる。
また黒鉛と併用することで、黒鉛の潤滑性が発揮され成形時のノズルとの抵抗も小さくなり、鉛筆芯の表面がざらついたりする外観上の問題点も発生しない。
The mica represented by the above (Equation 1) has a flake shape similar to that of graphite. Therefore, when the mica is extruded together with graphite, the mica is oriented in the same direction as the graphite and becomes a dense core. Therefore, it is presumed that, by firing at 1000 ° C. or higher, the skeleton of the core body becomes strong and the core body is hard to break. In addition, since the mica represented by the above (Equation 1) retains crystals up to 1100 ° C., when the core is obtained by firing at about 1000 ° C. to 1100 ° C., the surface of the mica remains retained. The organic binder adhering to the surface is sufficiently baked, adheres to the oriented graphite and the mica surface represented by (Equation 1) as a pure black carbide, and a pure black handwriting and good writing quality are obtained.
Further, when used in combination with graphite, the lubricity of graphite is exhibited, the resistance to the nozzle at the time of molding is reduced, and the problem of appearance that the surface of the pencil lead is rough does not occur.

以下、本発明を詳細に説明する。
本発明で用いる上記(数1)で示される雲母は、水熱法、固相反応法、溶融合成法により合成できる。例えば、溶融合成法は、珪砂、酸化マグネシウム、酸化アルミニウム、珪フッ化カリウム、珪フッ化ソーダ等の原料を加熱し約1500℃で溶融し、冷却して結晶化させる方法である。乾式又は湿式粉砕することで任意の粒度にすることができる。また酸化アルミニウムを酸化鉄や酸化硼素に原料を替えることで任意の結晶にすることができる。代表的な構造はKMg(AlSi10)Fであり合成フッ素金雲母として市販されている。市販品の具体例としては、例えば、トピー工業株式会社製の商品名PDM−7−80、PDM−6−30、PDM−800、PDM−1000、PDM−20L、PDM−20B、PDM−8W、PDM−9WA、PDM−9WB等がある。
Hereinafter, the present invention will be described in detail.
The mica represented by (Expression 1) used in the present invention can be synthesized by a hydrothermal method, a solid phase reaction method, or a melt synthesis method. For example, the melt synthesis method is a method in which raw materials such as silica sand, magnesium oxide, aluminum oxide, potassium silicofluoride, and sodium silicofluoride are heated, melted at about 1500 ° C., and cooled to be crystallized. Any particle size can be obtained by dry or wet grinding. In addition, any crystal can be obtained by changing the raw material of aluminum oxide to iron oxide or boron oxide. A typical structure is KMg 3 (AlSi 3 O 10 ) F 2, which is commercially available as synthetic fluorine phlogopite. Specific examples of commercially available products include, for example, trade names PDM-7-80, PDM-6-30, PDM-800, PDM-1000, PDM-20L, PDM-20B, PDM-8W, manufactured by Topy Industries, Ltd. PDM-9WA, PDM-9WB, etc. are available.

上記一般式(数1)で示される雲母が他の雲母と比較して熱分解しにくい理由は、結晶構造中の水酸基がないこと。水酸基がフッ素で置換されているので、加熱により脱水作用ないため結晶の分解がないことによる。雲母の水酸基をフッ素に置き換える理由は原子価(=−1)とイオン半径(=1.33オングストローム)が同じであることによる。また、結晶構造が、四面体層のSiの一部がAl、Fe、Bの3価の陽イオンに置き換わることでタブレットは負の電荷もつようになり層間のXのイオンと強く結合するようになる。その結果、四面体層同士のファンデルワールス力による弱い結合を金属イオンが補強する働きを担い、上記一般式(数1)で示される雲母の結晶はしっかりとした構造となり熱的安定になっていると推測される。
この上記一般式(数1)で示される雲母の含有割合は黒鉛を含めた体質材全量に対して特に限定されないが、好ましくは15重量%以上80重量%以下であれば良い。上記一般式(数1)で示される雲母の含有割合が体質材全量に対して15重量%未満の場合は、焼成鉛筆芯の黒さが低下する。また80重量%を超える含有割合であると曲げ強さが低下する。
The reason why the mica represented by the above general formula (Equation 1) is less thermally decomposed than other mica is that there is no hydroxyl group in the crystal structure. This is because since the hydroxyl group is substituted with fluorine, there is no dehydration effect by heating, so there is no decomposition of crystals. The reason for replacing the mica hydroxyl group with fluorine is that the valence (= -1) and the ionic radius (= 1.33 angstrom) are the same. The crystal structure is such that a part of Si in the tetrahedral layer is replaced with trivalent cations of Al, Fe, and B, so that the tablet has a negative charge and is strongly bonded to the X ion between the layers. Become. As a result, the metal ions reinforce the weak bond due to van der Waals forces between the tetrahedral layers, and the mica crystal represented by the general formula (Equation 1) has a firm structure and is thermally stable. It is estimated that
The content of mica represented by the above general formula (Equation 1) is not particularly limited with respect to the total amount of the extender including graphite, but is preferably 15% by weight to 80% by weight. When the content ratio of mica represented by the general formula (Equation 1) is less than 15% by weight with respect to the total amount of the extender, the blackness of the fired pencil lead is lowered. Moreover, bending strength will fall that it is a content rate exceeding 80 weight%.

この上記一般式(数1)で示される雲母と共に用いる黒鉛は鱗状黒鉛、鱗片状黒鉛、土壌黒鉛、人造黒鉛等が代表例であるが特に限定されない。更に、必要に応じて、窒化ホウ素、窒化珪素、板状アルミナ、セリサイト、タルク、マイカ、カオリン、ベントナイト、炭酸カルシウム、炭酸マグネシウム、硫酸マグネシウム、無機繊維状物質ウイスカー、カーボンブラック、酸化珪素等を任意に添加してよい。   Typical examples of the graphite used together with the mica represented by the above general formula (Formula 1) are scale-like graphite, scale-like graphite, soil graphite, artificial graphite and the like, but are not particularly limited. Furthermore, boron nitride, silicon nitride, plate-like alumina, sericite, talc, mica, kaolin, bentonite, calcium carbonate, magnesium carbonate, magnesium sulfate, inorganic fibrous material whisker, carbon black, silicon oxide, etc. You may add arbitrarily.

本発明に係わる焼成芯体は、従来、鉛筆やシャープペンシル用替芯などの焼成芯体に用いられている構成材料及び製造方法を限定なく用いることができる。
例えば、上記一般式(数1)にて示される化合物と体質材と共に、粘土や各種合成樹脂などを結合材として使用し、各種の体質材や必要に応じて使用される着色材、気孔形成材、可塑剤、溶剤などと共にニーダー、ヘンシェルミキサー、3本ロールなどで均一分散させ、押し出し成形後、800℃〜1100℃で高温焼成して得られる。焼成された芯体の気孔中に種々物質を、種々目的で含浸させている。具体的には、粘土やポリ塩化ビニル、ポリ塩素化ポリエチレン、フラン樹脂、ポリビニルアルコール、スチロール樹脂、アクリル樹脂、尿素樹脂、メラミン樹脂、ポリエステル樹脂などの合成樹脂を結合材として使用し、黒鉛、窒化硼素、タルク、雲母などの体質材、必要に応じて使用される有機顔料や無機顔料などの着色材、ポリアミド、ポリエチレン、ポリメチルメタクリレート(PMMA)などの気孔形成材、フタル酸ジオクチル(DOP)、フタル酸ジブチル(DBP)などの可塑剤、水、アルコール、ケトン、エステル、芳香族炭化水素などの溶剤と共にニーダー、ヘンシェルミキサー、3本ロールなどで均一分散させた後に成形、高温焼成して得られる。
更に、必要に応じて油状物を含浸して鉛筆芯とする。含浸成分としては従来公知の流動パラフィン、シリコーン油、スクワラン、スピンドル油、α−オレフィンオリゴマー、脂肪酸エステル、高級アルコール、ステアリン酸、ポリブデン、エチレン−プロピレン−ブテン共重合体、非結晶ポリプロピレン、エチレン極性モノマー共重合体。ポリエチレン、ポリイソブチレン、非晶性ポリα−オレフィンなどと任意の割合で混合しても良い。
また、前記含浸成分を焼成芯体中に含浸させる方法としては、加熱した含浸成分中に芯体を浸漬加温による方法、または、減圧、加圧して含浸する方法、有機溶剤で希釈させて流動性を上げてから含浸する方法を用いることができる。含浸後は適宜、遠心分離機などで焼成芯体表面の余分な含浸成分を除去して鉛筆芯とすれば良い。
The fired core body according to the present invention can use, without limitation, constituent materials and manufacturing methods conventionally used for fired core bodies such as pencils and mechanical pencil replacement cores.
For example, together with the compound represented by the general formula (Equation 1) and the extender, clay, various synthetic resins, and the like are used as binders, and various extenders and coloring agents and pore forming materials used as necessary. It is obtained by uniform dispersion with a kneader, Henschel mixer, three rolls, etc. together with a plasticizer, a solvent, etc., extrusion molding, and high-temperature firing at 800 ° C. to 1100 ° C. The pores of the fired core are impregnated with various substances for various purposes. Specifically, synthetic resin such as clay, polyvinyl chloride, polychlorinated polyethylene, furan resin, polyvinyl alcohol, styrene resin, acrylic resin, urea resin, melamine resin, polyester resin is used as a binder, graphite, nitriding Constitutional materials such as boron, talc, mica, coloring materials such as organic pigments and inorganic pigments used as necessary, pore forming materials such as polyamide, polyethylene, polymethyl methacrylate (PMMA), dioctyl phthalate (DOP), It is obtained by uniform dispersion with a kneader, Henschel mixer, three rolls, etc. together with plasticizers such as dibutyl phthalate (DBP), solvents such as water, alcohol, ketones, esters, and aromatic hydrocarbons, and molding and firing at high temperature. .
Furthermore, an oily material is impregnated as necessary to form a pencil lead. As impregnation components, conventionally known liquid paraffin, silicone oil, squalane, spindle oil, α-olefin oligomer, fatty acid ester, higher alcohol, stearic acid, polybutene, ethylene-propylene-butene copolymer, amorphous polypropylene, ethylene polar monomer Copolymer. You may mix with polyethylene, polyisobutylene, an amorphous poly alpha olefin, etc. in arbitrary ratios.
The impregnated component is impregnated into the fired core by immersing and heating the core in the heated impregnated component, or by impregnating under reduced pressure and pressure, by diluting with an organic solvent and flowing. A method of impregnating after improving the properties can be used. After the impregnation, an extra impregnated component on the surface of the fired core body may be appropriately removed with a centrifuge to form a pencil lead.

次に実施例を挙げて本発明を更に説明するが、本発明はこれら実施例に限定されない。<実施例1>
(雲母1)
珪フッ化カリウム24g、酸化マグネシウム22g、酸化アルミニウム11g、二酸化珪素33gをボーミルミルで1時間混合粉砕し、この混合物をアルミナルツボ中で1500℃で30分間溶融後、冷却した後ボールミル中で24時間粉砕する。0.05Nの塩酸水溶液中に12時間攪拌分散させ後、濾過乾燥して雲母を得た。X線回折パターンによりKMg(AlSi10)Fと一致した。
(芯体配合物)
塩化ビニル(有機結合材) 30重量部
雲母1 25重量部
黒鉛 25重量部
ジオクチルフタレート 10重量部
ステアリン酸 2重量部
メチルエチルケトン 30重量部
上記材料を配合物として、ニーダー及び3本ロールにより十分に混練後、細線状に押し出し、空気中で300℃まで加熱し、更に、不活性雰囲気中で1100℃まで加熱し、呼び径0.7mmの焼成芯体を得た。尚、得られた焼成芯体を、X線回折により分析した結果KMg(AlSi10)Fと一致するパターンが確認できた。これを100℃に加熱した流動パラフィン中に16時間浸漬後、表面上の余分な流動パラフィンを除去して鉛筆芯を得た。
EXAMPLES Next, although an Example is given and this invention is demonstrated further, this invention is not limited to these Examples. <Example 1>
(Mica 1)
24 g of potassium silicofluoride, 22 g of magnesium oxide, 11 g of aluminum oxide, and 33 g of silicon dioxide were mixed and pulverized in a bow mill for 1 hour. The mixture was melted in an alumina crucible at 1500 ° C. for 30 minutes, cooled, and then pulverized in a ball mill for 24 hours. To do. The mixture was stirred and dispersed in a 0.05N hydrochloric acid aqueous solution for 12 hours and then filtered and dried to obtain mica. The X-ray diffraction pattern agreed with KMg 3 (AlSi 3 O 10 ) F 2 .
(Core composition)
Vinyl chloride (organic binder) 30 parts by weight Mica 1 25 parts by weight Graphite 25 parts by weight Dioctyl phthalate 10 parts by weight Stearic acid 2 parts by weight Methyl ethyl ketone 30 parts by weight The above materials are blended sufficiently with a kneader and three rolls. It was extruded into a thin line, heated to 300 ° C. in air, and further heated to 1100 ° C. in an inert atmosphere to obtain a fired core having a nominal diameter of 0.7 mm. The obtained fired core was analyzed by X-ray diffraction, and as a result, a pattern consistent with KMg 3 (AlSi 3 O 10 ) F 2 was confirmed. This was immersed in liquid paraffin heated to 100 ° C. for 16 hours, and then excess liquid paraffin on the surface was removed to obtain a pencil lead.

<実施例2>
(雲母2)
実施例1において酸化アルミニウム11gを酸化第2鉄17gとした以外は実施例1と同様にした。X線回折パターンによりKMg(FeSi10)Fと一致した。
(芯体配合物)
塩化ビニル(有機結合材) 30重量部
雲母2 40重量部
黒鉛 10重量部
ジオクチルフタレート 10重量部
ステアリン酸 2重量部
メチルエチルケトン 30重量部
上記配合物を用い実施例1と同様にした。
<Example 2>
(Mica 2)
Example 1 was the same as Example 1 except that 11 g of aluminum oxide was changed to 17 g of ferric oxide. The X-ray diffraction pattern was consistent with KMg 3 (FeSi 3 O 10 ) F 2 .
(Core composition)
Vinyl chloride (organic binder) 30 parts by weight Mica 2 40 parts by weight Graphite 10 parts by weight Dioctyl phthalate 10 parts by weight Stearic acid 2 parts by weight Methyl ethyl ketone 30 parts by weight The same composition was used as in Example 1.

<実施例3>
(雲母3)
実施例1において酸化アルミニウム11gを酸化硼素8gとした以外は実施例1と同様にした。X線回折パターンによりKMg(BSi10)Fと一致した。
(芯体配合物)
塩化ビニル(有機結合材) 30重量部
雲母3 42重量部
黒鉛 8重量部
ジオクチルフタレート 10重量部
ステアリン酸 2重量部
メチルエチルケトン 30重量部
上記配合物を用い実施例1と同様にした。
<Example 3>
(Mica 3)
Example 1 was the same as Example 1 except that 11 g of aluminum oxide was changed to 8 g of boron oxide. The X-ray diffraction pattern was consistent with KMg 3 (BSi 3 O 10 ) F 2 .
(Core composition)
Vinyl chloride (organic binder) 30 parts by weight Mica 3 42 parts by weight Graphite 8 parts by weight Dioctyl phthalate 10 parts by weight Stearic acid 2 parts by weight Methyl ethyl ketone 30 parts by weight The same composition as in Example 1 was used.

<実施例4>
(芯体配合物)
塩化ビニル(有機結合材) 30重量部
雲母3(実施例3と同様) 40重量部
黒鉛 10重量部
ジオクチルフタレート 10重量部
ステアリン酸 2重量部
メチルエチルケトン 30重量部
上記配合物を用い実施例1と同様にした。
<Example 4>
(Core composition)
Vinyl chloride (organic binder) 30 parts by weight Mica 3 (same as in Example 3) 40 parts by weight Graphite 10 parts by weight Dioctyl phthalate 10 parts by weight Stearic acid 2 parts by weight Methyl ethyl ketone 30 parts by weight As in Example 1 I made it.

<実施例5>
(芯体配合物)
塩化ビニル(有機結合材) 30重量部
雲母3(実施例3と同様) 38重量部
黒鉛 12重量部
ジオクチルフタレート 10重量部
ステアリン酸 2重量部
メチルエチルケトン 30重量部
上記配合物を用い実施例1と同様にした。
<Example 5>
(Core composition)
Vinyl chloride (organic binder) 30 parts by weight Mica 3 (same as in Example 3) 38 parts by weight Graphite 12 parts by weight Dioctyl phthalate 10 parts by weight Stearic acid 2 parts by weight Methyl ethyl ketone 30 parts by weight As in Example 1 I made it.

<実施例6>
(芯体配合物)
塩化ビニル(有機結合材) 30重量部
雲母3(実施例3と同様) 10重量部
黒鉛 40重量部
ジオクチルフタレート 10重量部
ステアリン酸 2重量部
メチルエチルケトン 30重量部
上記配合物を用い実施例1と同様にした。
<Example 6>
(Core composition)
Vinyl chloride (organic binder) 30 parts by weight Mica 3 (same as in Example 3) 10 parts by weight Graphite 40 parts by weight Dioctyl phthalate 10 parts by weight Stearic acid 2 parts by weight Methyl ethyl ketone 30 parts by weight As in Example 1 I made it.

<実施例7>
(芯体配合物)
塩化ビニル(有機結合材) 30重量部
雲母3(実施例3と同様) 7.5重量部
黒鉛 42.5重量部
ジオクチルフタレート 10重量部
ステアリン酸 2重量部
メチルエチルケトン 30重量部
上記配合物を用い実施例1と同様にした。
<Example 7>
(Core composition)
Vinyl chloride (organic binder) 30 parts by weight Mica 3 (same as Example 3) 7.5 parts by weight Graphite 42.5 parts by weight Dioctyl phthalate 10 parts by weight Stearic acid 2 parts by weight Methyl ethyl ketone 30 parts by weight Same as Example 1.

<実施例8>
(芯体配合物)
塩化ビニル(有機結合材) 30重量部
雲母3(実施例3と同様) 5重量部
黒鉛 45重量部
ジオクチルフタレート 10重量部
ステアリン酸 2重量部
メチルエチルケトン 30重量部
上記配合物を用い実施例1と同様にした。
<Example 8>
(Core composition)
Vinyl chloride (organic binder) 30 parts by weight Mica 3 (same as in Example 3) 5 parts by weight Graphite 45 parts by weight Dioctyl phthalate 10 parts by weight Stearic acid 2 parts by weight Methyl ethyl ketone 30 parts by weight As in Example 1 I made it.

<実施例9>
(芯体配合物)
塩化ビニル(有機結合材) 30重量部
PDM−9WA(KMg(AlSi10)F、トピー工業(株))
10重量部
黒鉛 40重量部
ジオクチルフタレート 10重量部
ステアリン酸 2重量部
メチルエチルケトン 30重量部
上記配合物を用い実施例1と同様にした。
<Example 9>
(Core composition)
Vinyl chloride (organic binder) 30 parts by weight PDM-9WA (KMg 3 (AlSi 3 O 10 ) F 2 , Topy Industries, Ltd.)
10 parts by weight Graphite 40 parts by weight Dioctyl phthalate 10 parts by weight Stearic acid 2 parts by weight Methyl ethyl ketone 30 parts by weight The same formulation was used as in Example 1.

<実施例10>
(芯体配合物)
塩化ビニル(有機結合材) 30重量部
PDM−9WA(KMg(AlSi10)F、トピー工業(株))
15重量部
黒鉛 35重量部
ジオクチルフタレート 10重量部
シリコーンオイル 0.5重量部
ステアリン酸 2重量部
メチルエチルケトン 30重量部
上記配合物を用い実施例1と同様にした。
<Example 10>
(Core composition)
Vinyl chloride (organic binder) 30 parts by weight PDM-9WA (KMg 3 (AlSi 3 O 10 ) F 2 , Topy Industries, Ltd.)
15 parts by weight Graphite 35 parts by weight Dioctyl phthalate 10 parts by weight Silicone oil 0.5 parts by weight Stearic acid 2 parts by weight Methyl ethyl ketone 30 parts by weight The same composition as in Example 1 was used.

<実施例11>
(芯体配合物)
塩化ビニル(有機結合材) 30重量部
PDM−9WA(KMg(AlSi10)F、トピー工業(株))
20重量部
黒鉛 25重量部
タルク 5重量部
ジオクチルフタレート 10重量部
シリコーンオイル 0.5重量部
ステアリン酸 2重量部
メチルエチルケトン 30重量部
上記配合物を用い実施例1と同様にした。
<Example 11>
(Core composition)
Vinyl chloride (organic binder) 30 parts by weight PDM-9WA (KMg 3 (AlSi 3 O 10 ) F 2 , Topy Industries, Ltd.)
20 parts by weight Graphite 25 parts by weight Talc 5 parts by weight Dioctyl phthalate 10 parts by weight Silicone oil 0.5 parts by weight Stearic acid 2 parts by weight Methyl ethyl ketone 30 parts by weight The same composition as in Example 1 was used.

<比較例1>
(芯体配合物)
塩化ビニル(有機結合材) 30重量部
A−500(KAl(AlSi10)(OH)、天然雲母、(株)山口雲母工業所製) 25重量部
黒鉛 25重量部
ジオクチルフタレート 10重量部
ステアリン酸 2重量部
メチルエチルケトン 30重量部
上記配合物を用い実施例1と同様にした。
<Comparative Example 1>
(Core composition)
Vinyl chloride (organic binder) 30 parts by weight A-500 (KAl 2 (AlSi 3 O 10 ) (OH) 2 , natural mica, manufactured by Yamaguchi Mica Industrial Co., Ltd.) 25 parts by weight Graphite 25 parts by weight Dioctyl phthalate 10 parts by weight Part of stearic acid 2 parts by weight Methyl ethyl ketone 30 parts by weight The same formulation as in Example 1 was used.

<比較例2>
(芯体配合物)
塩化ビニル(有機結合材) 30重量部
DMA−350(NaMg25(Si10)F、膨潤系合成雲母、トピー工業(株)製) 5重量部
黒鉛 45重量部
ジオクチルフタレート 10重量部
ステアリン酸 2重量部
メチルエチルケトン 30重量部
上記配合物を用い実施例1と同様にした。
<Comparative example 2>
(Core composition)
Vinyl chloride (organic binder) 30 parts by weight DMA-350 (NaMg 25 (Si 4 O 10 ) F 2 , swelling synthetic mica, manufactured by Topy Industries, Ltd.) 5 parts by weight Graphite 45 parts by weight Dioctyl phthalate 10 parts by weight Stearin Acid 2 parts by weight Methyl ethyl ketone 30 parts by weight The same formulation as in Example 1 was used.

<比較例3>
(芯体配合物)
塩化ビニル(有機結合材) 30重量部
PDM−K(G)−325(KMg25(Si10)F、合成雲母、トピー工業(株)製) 45重量部
黒鉛 5重量部
ジオクチルフタレート 10重量部
ステアリン酸 2重量部
メチルエチルケトン 30重量部
上記配合物を用い実施例1と同様にした。
<Comparative Example 3>
(Core composition)
Vinyl chloride (organic binder) 30 parts by weight PDM-K (G) -325 (KMg 25 (Si 4 O 10 ) F 2 , synthetic mica, manufactured by Topy Industries, Ltd.) 45 parts by weight Graphite 5 parts by weight Dioctyl phthalate 10 Parts by weight stearic acid 2 parts by weight methyl ethyl ketone 30 parts by weight The same formulation as in Example 1 was used.

<比較例4>
(芯体配合物)
塩化ビニル(有機結合材) 30重量部
黒鉛 50重量部
ジオクチルフタレート 10重量部
ステアリン酸 2重量部
メチルエチルケトン 30重量部
上記配合物を用い実施例1と同様にした。
<Comparative Example 4>
(Core composition)
Vinyl chloride (organic binder) 30 parts by weight Graphite 50 parts by weight Dioctyl phthalate 10 parts by weight Stearic acid 2 parts by weight Methyl ethyl ketone 30 parts by weight The same composition was used as in Example 1.

<比較例5>
(芯体配合物)
塩化ビニル(有機結合材) 30重量部
雲母3(実施例3と同様) 50重量部
ジオクチルフタレート 10重量部
ステアリン酸 2重量部
メチルエチルケトン 30重量部
上記配合物を用い実施例1と同様にした。
<Comparative Example 5>
(Core composition)
Vinyl chloride (organic binder) 30 parts by weight Mica 3 (similar to Example 3) 50 parts by weight Dioctyl phthalate 10 parts by weight Stearic acid 2 parts by weight Methyl ethyl ketone 30 parts by weight The same composition as in Example 1 was used.

上記各例により得られた鉛筆芯の折損強度、濃度、Y値について試験した結果及び、鉛筆芯の表面状態の評価結果を表1に示す。   Table 1 shows the results of testing the breaking strength, concentration, and Y value of the pencil lead obtained in each of the above examples, and the evaluation results of the surface state of the pencil lead.

Claims (2)

少なくとも有機結合材と体質材とを原材料として使用し、混練した原材料を細線状に押出成形後、焼成処理を施してなる鉛筆芯において、体質材として下記一般式(数1)で示される雲母と黒鉛を少なくとも使用する焼成鉛筆芯。
In a pencil lead formed by using at least an organic binder and an extender as raw materials, and extruding the kneaded raw material into a thin line shape and then performing a baking treatment, mica represented by the following general formula (Formula 1) A fired pencil lead that uses at least graphite.
前記一般式(数1)で示される雲母の含有割合が体質材の15重量%以上80重量%以下である請求項1記載の焼成鉛筆芯。 The fired pencil lead according to claim 1, wherein the content of mica represented by the general formula (Equation 1) is 15% by weight or more and 80% by weight or less of the extender.
JP2006325070A 2005-11-30 2006-11-30 Pencil lead Pending JP2008081715A (en)

Priority Applications (1)

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Country Link
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011225852A (en) * 2010-04-02 2011-11-10 Pentel Corp Pencil lead
CN111826717A (en) * 2020-07-14 2020-10-27 广东三宝新材料科技股份有限公司 Artificially synthesized black mica crystal and crystallization method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011225852A (en) * 2010-04-02 2011-11-10 Pentel Corp Pencil lead
CN111826717A (en) * 2020-07-14 2020-10-27 广东三宝新材料科技股份有限公司 Artificially synthesized black mica crystal and crystallization method thereof

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