JP2008056829A - Pencil lead - Google Patents
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- JP2008056829A JP2008056829A JP2006236890A JP2006236890A JP2008056829A JP 2008056829 A JP2008056829 A JP 2008056829A JP 2006236890 A JP2006236890 A JP 2006236890A JP 2006236890 A JP2006236890 A JP 2006236890A JP 2008056829 A JP2008056829 A JP 2008056829A
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Abstract
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.
鉛筆芯は、黒鉛や窒化硼素等の各種体質材と、粘土や各種合成樹脂などを結合材として使用し、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−ダ−、ヘンシェルミキサ−、3本ロ−ルなどで均一分散させ、押し出し成形後、800℃〜1200℃で高温焼成して得られる。焼成熱処理して得られた芯体には、合成樹脂、可塑剤、溶剤の揮発または熱分解による気孔が形成されるが、濃度向上、書き味を狙いとして一般的には油状物を含浸させている。油状物の一例としては、流動パラフィン、シリコ−ン油やスピンドル油、脂肪酸エステル、パラフィンワックス、カルナバワックス、マイクロクリスタリン等のワックスが一般的で、これらの含浸成分を加圧、減圧などや加熱した油状物中に焼成芯体を浸漬した後、余剰の油状物を表面より除去するなどして鉛筆芯としている。油状物以外を焼成芯の気孔中に入れたものとしては、樹脂(フラン樹脂を使用)を含浸したり(特許文献1)、金属を加熱溶融して含浸させたり(特許文献2)、光硬化性樹脂を充填させたり(特許文献3)したものが知られているが、いずれも芯の強度向上を目的としたものである。
特許文献1、特許文献2、特許文献3に開示されているものは、いずれも気孔中に樹脂や金属が充填され強度を上げることは出来たが、反面、大幅に筆跡の濃度が薄いという問題があった。 All of those disclosed in Patent Document 1, Patent Document 2, and Patent Document 3 were able to increase the strength by filling the pores with resin or metal, but on the other hand, there was a problem that the density of the handwriting was significantly low was there.
本発明は、焼成芯体が有する気孔中に、含浸成分を含浸させてなる鉛筆芯において、シクロデキストリンを含浸成分中に少なくとも含有する鉛筆芯を要旨とする。 The gist of the present invention is a pencil lead in which at least a cyclodextrin is contained in an impregnated component in a pencil lead formed by impregnating the impregnated component into pores of the fired core.
シクロデキストリンは、グルコースが王冠のように連なる環状オリゴ糖でド−ナツ状分子として知られ、水等の極性溶媒中ではド−ナツ構造の内側が疎水性、外側が親水性であるため界面活性剤として作用する。また、水等の極性溶媒を乾燥すると強固な皮膜を形成する特徴がある。
焼成芯体中に水又はエチルアルコ−ルで溶解したシクロデキストリンを含浸させると上記の界面活性剤効果により体質材の黒鉛との濡れが良くなり気孔の細部まで含浸することができる。そして水又はエチルアルコ−ルを乾燥すると、気孔細部内壁までシクロデキストリンの皮膜が形成される。その結果、気孔細部内壁までシクロデキストリン皮膜が形成されることで気孔全体の補強材として作用し、外部の力による気孔の崩れを防止し結果として強度向上したと推測される。
従来は樹脂や金属を気孔細部まで含浸できないため、強度向上のためには樹脂や金属の含浸量を多くしなければならなかった。そのためどうしても樹脂や金属含浸量が多くなり濃度低下してしまっていた。
これに対して、デキストリンは少ない含浸量で気孔細部内壁まで皮膜形成することができ、また、気孔内壁に皮膜形成させる量として十分なため、少ない含浸量で効果を出すことができる。少ない含浸量であるため筆跡濃度が薄くならず、強度向上できたと推測される。
Cyclodextrin is a cyclic oligosaccharide in which glucose is linked like a crown, and is known as a donut-like molecule. In polar solvents such as water, the inside of the donut structure is hydrophobic and the outside is hydrophilic, so it is surface active. Acts as an agent. In addition, when a polar solvent such as water is dried, a strong film is formed.
When the fired core is impregnated with cyclodextrin dissolved with water or ethyl alcohol, the above-mentioned surfactant effect improves the wettability of the extender with graphite, and the fine pores can be impregnated. When water or ethyl alcohol is dried, a film of cyclodextrin is formed up to the pore inner walls. As a result, it is presumed that the cyclodextrin film is formed up to the inner wall of the fine pores, thereby acting as a reinforcing material for the whole pores, preventing collapse of the pores due to external force, and consequently improving the strength.
Conventionally, resin and metal cannot be impregnated to the finest pores, so the amount of resin or metal impregnated must be increased in order to improve strength. Therefore had gotten lowered density inevitably increases the resin or metal-impregnated amount.
On the other hand, dextrin can form a film up to the fine pore inner walls with a small amount of impregnation, and is sufficient as an amount to form a film on the pore inner walls, so that the effect can be obtained with a small amount of impregnation. Since the amount of impregnation is small, the handwriting density is not reduced, and it is estimated that the strength can be improved.
以下、本発明を詳細に説明する。
本発明で用いるシクロデキストリンは、6個以上のグルコースが王冠のように連なる環状オリゴ糖で、デンプンに細菌由来のシクロデキストリン類生成酵素を作用させて得られるものである。本発明において用いられるシクロデキストリンはα−シクロデキストリン、β−シクロデキストリン、γ−シクロデキストリンのいずれか1種若しくは2種以上が用いることができる。
Hereinafter, the present invention will be described in detail.
The cyclodextrin used in the present invention is a cyclic oligosaccharide in which 6 or more glucoses are linked like a crown, and is obtained by causing a bacterial cyclodextrin-forming enzyme to act on starch. As the cyclodextrin used in the present invention, one or more of α-cyclodextrin, β-cyclodextrin and γ-cyclodextrin can be used.
また、本発明で用いるシクロデキストリンは置換基を有してもよい。置換基を有するシクロデキストリンとしては特に限定されず用いることが出来るが、例えば、ヒドロキシルアルキル化シクロデキストリン、アルキル化シクロデキストリン、グルコキシル化シクロデキストリン、アミノ化シクロデキストリン、カルボキシメチル化シクロデキストリン、グルコ−ス残基の少なくともその一部をヒドロキシエチル、2−ヒドロキシプロピル、2,3−ジヒドロキシプロピル、2−ヒドロキシブチル、2−ヒドロキシイソブチル、ジエチルアミノエチル、トリメチルアンモニウムプロピルなどの親水性官能基にしたシクロデキストリン、エピクロルヒドリンや多価グリシジルエ−テルなどの架橋剤にて高分子化したシクロデキストリンポリマ−、グルコ−ス、マルノ−スなどの分岐側鎖を有する分岐シクロデキストリン、高度分岐環状デキストリン等のいずれか1種若しくは2種以上が用いることができる。
含浸量は焼成芯体全量に対して0.1重量%以上30重量%以下で十分である。0.1重量%以下でもよいが強度向上の効果が徐々に小さくなる。また30重量%以上添加してもよいが濃度が徐々に低下してしまう。
The cyclodextrin used in the present invention may have a substituent. The cyclodextrin having a substituent can be used without any particular limitation. For example, hydroxylalkylated cyclodextrin, alkylated cyclodextrin, glucoxylated cyclodextrin, aminated cyclodextrin, carboxymethylated cyclodextrin, glucose A cyclodextrin having at least a part of a residue as a hydrophilic functional group such as hydroxyethyl, 2-hydroxypropyl, 2,3-dihydroxypropyl, 2-hydroxybutyl, 2-hydroxyisobutyl, diethylaminoethyl, trimethylammoniumpropyl, Branched cyclodex having branched side chains such as cyclodextrin polymer, glucose and marnose polymerized with a crosslinking agent such as epichlorohydrin or polyvalent glycidyl ether Phosphide can be used at least one or two or such highly branched cyclic dextrin.
The amount of impregnation is sufficient to be 0.1 wt% or more and 30 wt% or less with respect to the total amount of the fired core. Although it may be 0.1% by weight or less, the effect of improving the strength gradually decreases. Moreover, although 30 weight% or more may be added, a density | concentration will fall gradually.
前記シクロデキストリンを焼成芯体に含浸された状態のままで用いても良いが、従来公知の含浸成分である流動パラフィン、シリコ−ン油、スピンドル油、スクワラン、α−オレフィンオリゴマ−、脂肪酸エステル、高級アルコ−ル、ポリブデン、ポリブデンとエチレン−プロピレン−ブテン共重合体、非結晶プロピレン、エチレン−極性モノマ−共重合体、ポリエチレン、ポリイソブチレン、非結晶ポリα−オレフィンなどと併用したほうが濃度向上し望ましい。また白色焼成芯体の場合には染料を含浸して着色処理を施しても良い。
本発明において含有させるシクロデキストリンは分子取り込み機能があるため薬剤、シリコ−ンオイル、フッ素オイル、界面活性剤、可塑剤、ゲル化剤、保湿剤、滑剤、潤滑油、インキ、着色剤、紫外線防止剤、酸化防止剤、防腐剤等の材料を目的に応じて種々含浸させても良い。この場合も従来公知の含浸成分を目的に応じ含浸させてもよい。
The cyclodextrin may be used as it is impregnated in the calcined core, but conventionally known impregnating components such as liquid paraffin, silicone oil, spindle oil, squalane, α-olefin oligomer, fatty acid ester, Higher alcohol, polybutene, polybutene and ethylene-propylene-butene copolymer, non-crystalline propylene, ethylene-polar monomer copolymer, polyethylene, polyisobutylene, non-crystalline poly α-olefin, etc. can be used to improve the concentration. desirable. In the case of a white fired core, a coloring treatment may be performed by impregnating with a dye.
Since the cyclodextrin contained in the present invention has a molecular uptake function, it is a drug, silicone oil, fluorine oil, surfactant, plasticizer, gelling agent, moisturizer, lubricant, lubricating oil, ink, colorant, UV protection agent Depending on the purpose, various kinds of materials such as antioxidants and preservatives may be impregnated. Also in this case, a conventionally known impregnation component may be impregnated according to the purpose.
本発明に係わる焼成芯体は、従来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。
鉛筆芯は、黒鉛や窒化硼素等の各種体質材と、粘土や各種合成樹脂などを結合材として使用し、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−ダ−、ヘンシェルミキサ−、3本ロ−ルなどで均一分散させ、押し出し成形後、800℃以上1200℃以下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−ル、スチロ−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−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−ル、ケトン、エステル、芳香族炭化水素などの溶剤と共にニ−ダ−、ヘンシェルミキサ−、3本ロ−ルなどで均一分散させた後に成形、高温焼成して黒色又は白色の焼成鉛筆が得られる。
For the fired core according to the present invention, conventionally used constituent materials and manufacturing methods can be used without limitation.
The pencil core uses various materials such as graphite and boron nitride, clay and various synthetic resins as binders, and is used together with coloring materials, pore forming materials, plasticizers, solvents, etc. as necessary. It is obtained by uniform dispersion with a dur, Henschel mixer, three rolls, etc., extrusion molding, and firing at a high temperature of 800 ° C. to 1200 ° C. The pores of the fired core are impregnated with various substances for various purposes. Specifically, synthetic resins such as clay, polyvinyl chloride, polychlorinated polyethylene, furan resin, polyvinyl alcohol, styrene resin, acrylic resin, urea resin, melamine resin, and polyester resin are used as the binder. , Body materials such as graphite, boron nitride, talc, mica, colorants such as organic pigments and inorganic pigments used as necessary, pore forming materials such as polyamide, polyethylene, polymethyl methacrylate (PMMA), Together with plasticizers such as dioctyl phthalate (DOP) and dibutyl phthalate (DBP), solvents such as water, alcohols, ketones, esters and aromatic hydrocarbons, Henschel mixers, 3 rolls After being uniformly dispersed, etc., it is molded and fired at a high temperature to obtain a black or white fired pencil.
シクロデキストリンを焼成芯体に含浸成分として含有させる方法としては、水やアルコ−ルの極性溶媒で溶解又は分散したシクロデキストリンを焼成芯体に含浸させ、適宜、遠心分離機や乾燥器等で極性溶媒を除去させることで容易に含浸させることができる。含浸量は溶液の濃度を変えて含浸し、溶媒除去することで任意に含浸量を制御できる。高濃度の溶液を含浸してもよいし、低濃度溶液を含浸、乾燥を繰り返して濃度をあげて含浸させても良い。 As a method of incorporating cyclodextrin as an impregnation component into the fired core, cyclodextrin dissolved or dispersed in a polar solvent such as water or alcohol is impregnated into the fired core, and appropriately polarized with a centrifuge or a dryer. It can be easily impregnated by removing the solvent. The amount of impregnation can be arbitrarily controlled by changing the concentration of the solution to impregnate and removing the solvent. A high-concentration solution may be impregnated, or a low-concentration solution may be impregnated and dried repeatedly to increase the concentration.
そして、更にシクロデキストリンと共に従来公知の前記含浸油状物成分を焼成芯体中に含浸させても良い。含浸方法としては、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もできる。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。更にシクロデキストリンおよび極性溶媒と公知前記含浸油の混合溶液を同時に含浸した後、減圧等で極性溶媒を除去させ、シクロデキストリンと前記含浸油を含有させてもよい。 Further, the fired core may be impregnated with the conventionally known impregnated oil component together with cyclodextrin. As the impregnation method, it is also possible to use a method in which the core is immersed and heated in a heated impregnation component, a method in which the core is impregnated under reduced pressure or pressure, or a method in which the fluid is diluted with an organic solvent to increase fluidity and then impregnated. it can. 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. Furthermore, after simultaneously impregnating a mixed solution of cyclodextrin and a polar solvent and the known impregnated oil, the polar solvent may be removed under reduced pressure or the like to contain the cyclodextrin and the impregnated oil.
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るものではない。
<実施例1>
黒色焼成芯体
塩化ビニル樹脂 40重量部
黒鉛 50重量部
カ−ボンブラック 2重量部
ジオクチルフタレ−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
上記配合を配合物として、ニ−ダ−及び3本ロ−ルにより十分混練後、細線状に押し出し成形し、空気中で300℃まで加熱し、更に、不活性雰囲気で950℃に加熱し、呼び径0.5mm焼成芯体を得た。これを、下記含浸成分1を室温で24時間浸漬後、表面上の余分な含浸成分を除去して80℃温風乾燥を12時間した。前記含浸成分1を含む焼成芯体1を100℃に加熱した流動パラフィン中に16時間含浸し、表面上の余分な含浸成分を除去した鉛筆芯を得た。
<含浸成分1>
α−シクロデキストリン(セルデックスA−100、日本食品加工(株)製)
10重量部
水 100重量部
上記材料を攪拌溶解させて含浸成分1とした。
芯体全量に対するα−シクロデキストリンの含浸率は1.5重量%であった。
EXAMPLES Next, although an Example is given and this invention is further demonstrated, this invention is not limited to these Examples.
<Example 1>
Black fired core Vinyl chloride resin 40 parts by weight Graphite 50 parts by weight Carbon black 2 parts by weight Dioctyl phthalate 10 parts by weight Stearic acid 2 parts by weight Methyl ethyl ketone 30 parts by weight After sufficiently kneading with three rolls, it was extruded into a thin line, heated to 300 ° C. in air, and further heated to 950 ° C. in an inert atmosphere to obtain a fired core having a nominal diameter of 0.5 mm. This was impregnated with the following impregnated component 1 for 24 hours at room temperature, and then the excess impregnated component on the surface was removed, followed by drying at 80 ° C. with warm air for 12 hours. The fired core body 1 containing the impregnation component 1 was impregnated in liquid paraffin heated to 100 ° C. for 16 hours to obtain a pencil core from which excess impregnation components on the surface were removed.
<Impregnation component 1>
α-Cyclodextrin (Seldex A-100, manufactured by Nippon Food Processing Co., Ltd.)
10 parts by weight Water 100 parts by weight The above materials were dissolved by stirring to obtain impregnation component 1.
The impregnation rate of α-cyclodextrin with respect to the total amount of the core was 1.5% by weight.
尚、芯体含浸率は下記式より求めた。
含浸率=(W1−W2)/W1×100
W1:乾燥後の重量
W2:乾燥前の重量
The core impregnation rate was obtained from the following formula.
Impregnation rate = (W1-W2) / W1 × 100
W1: Weight after drying
W2: Weight before drying
<実施例2>
実施例1において、含浸成分1を下記含浸成分2に換えた以外実施例1と同様にして鉛筆芯を得た。
<含浸成分2>
ヒドロキシルプロピル化β−デキストリン(セルデックスHP−β−CD、日本食品加工(株)製) 1重量部
エタノ−ル 100重量部
上記材料を攪拌溶解させて含浸成分2とした。
芯体全量に対するヒドロキシルプロピル化β−デキストリンの含浸率は、0.15重量%であった。
<Example 2>
In Example 1, a pencil lead was obtained in the same manner as in Example 1 except that the impregnation component 1 was replaced with the following impregnation component 2.
<Impregnation component 2>
Hydroxylpropylated β-dextrin (Seldex HP-β-CD, manufactured by Nippon Food Processing Co., Ltd.) 1 part by weight Ethanol 100 parts by weight The above material was stirred and dissolved to obtain impregnation component 2.
The impregnation ratio of hydroxylpropylated β-dextrin with respect to the total amount of the core was 0.15% by weight.
<実施例3>
実施例1において、含浸成分1を下記含浸成分3に換えた以外実施例1と同様にして鉛筆芯を得た。
<含浸成分3>
グルコシル−ミックス−シクロデキストリン(セルデックスTB−50、日本食品加工(株)製) 30重量部
プロピレングリコ−ル 20重量部
水 50重量部
上記材料を攪拌溶解させて含浸成分3とした。
芯体全量に対するグルコシル−ミックス−シクロデキストリンの含浸率は、3.5重量%であった。
<Example 3>
In Example 1, a pencil lead was obtained in the same manner as in Example 1 except that the impregnation component 1 was replaced with the following impregnation component 3.
<Impregnation component 3>
Glucosyl-mix-cyclodextrin (Seldex TB-50, manufactured by Nippon Food Processing Co., Ltd.) 30 parts by weight Propylene glycol 20 parts by weight Water 50 parts by weight The above materials were stirred and dissolved to obtain impregnation component 3.
The impregnation rate of glucosyl-mix-cyclodextrin with respect to the total amount of the core was 3.5% by weight.
<実施例4>
実施例1において、含浸成分1を下記含浸成分4に換えて、含浸温度50℃で、含浸と乾燥を3回繰り返した以外は実施例1と同様にして鉛筆芯を得た。
<含浸成分4>
γ−シクロデキストリン(日本食品加工(株)製) 92重量部
水 100重量部
上記材料を攪拌溶解させ含浸成分4とした。
芯体全量に対するγ−シクロデキストリンの含浸率は、14.5重量%であった。
<Example 4>
In Example 1, a pencil lead was obtained in the same manner as in Example 1 except that the impregnation component 1 was changed to the following impregnation component 4 and the impregnation temperature was 50 ° C. and the impregnation and drying were repeated three times.
<Impregnation component 4>
γ-cyclodextrin (manufactured by Nippon Food Processing Co., Ltd.) 92 parts by weight Water 100 parts by weight The above material was stirred and dissolved to obtain impregnation component 4.
The impregnation rate of γ-cyclodextrin with respect to the total amount of the core was 14.5% by weight.
<実施例5>
実施例1において、含浸成分1を下記含浸成分5に換えて含浸温度を室温から60℃で、含浸と乾燥を4回繰り返した以外実施例1と同様にして鉛筆芯を得た。
<含浸成分5>
γ−シクロデキストリン(セルデックスG−100、日本食品加工(株)製)
100重量部
水 100重量部
上記材料を60℃で攪拌溶解させ含浸成分5とした。
芯体全量に対するγ−シクロデキストリンの含浸率は、28.5重量%であった。
<Example 5>
In Example 1, a pencil lead was obtained in the same manner as in Example 1 except that the impregnation component 1 was changed to the following impregnation component 5 and the impregnation temperature was from room temperature to 60 ° C., and impregnation and drying were repeated four times.
<Impregnation component 5>
γ-cyclodextrin (Seldex G-100, manufactured by Nippon Food Processing Co., Ltd.)
100 parts by weight Water 100 parts by weight The above material was stirred and dissolved at 60 ° C. to obtain impregnation component 5.
The impregnation rate of γ-cyclodextrin with respect to the total amount of the core was 28.5% by weight.
<実施例6>
実施例1において、含浸成分1を下記含浸成分6に換えた以外実施例1と同様にして鉛筆芯を得た。
<含浸成分6>
高度分岐環状デキストリン(クラスタ−デキストリン、日本食品加工(株)製)
10重量部
水 100重量部
上記材料を攪拌溶解させ含浸成分6とした。
芯体全量に対する高度分岐環状デキストリンの含浸率は、1.8重量%であった。
<Example 6>
In Example 1, a pencil lead was obtained in the same manner as in Example 1 except that the impregnation component 1 was changed to the following impregnation component 6.
<Impregnation component 6>
Highly branched cyclic dextrin (cluster-dextrin, manufactured by Nippon Food Processing Co., Ltd.)
10 parts by weight Water 100 parts by weight The above materials were dissolved with stirring to obtain impregnation component 6.
The impregnation ratio of the highly branched cyclic dextrin with respect to the total amount of the core was 1.8% by weight.
<実施例7>
実施例1において、含浸成分1を下記含浸成分7に換えた以外実施例1と同様にして鉛筆芯を得た。
<含浸成分7>
ヒドロキシルプロピル化β−デキストリン(セルデックスHP−β−CD、日本食品加工(株)製) 5重量部
β−シクロデキストリン(セルデックスB−100、日本食品加工(株)製)
5重量部
エタノ−ル 20重量部
水 100重量部
上記材料を攪拌溶解させ含浸成分7とした。
芯体全量に対するヒドロキシルプロピル化β−デキストリンとβ−シクロデキストリンとの合算の含浸率は、1.2重量%であった。
<Example 7>
In Example 1, a pencil lead was obtained in the same manner as in Example 1 except that the impregnation component 1 was changed to the following impregnation component 7.
<Impregnation component 7>
Hydroxypropylated β-dextrin (Seldex HP-β-CD, manufactured by Nippon Food Processing Co., Ltd.) 5 parts by weight β-cyclodextrin (Seldex B-100, manufactured by Nippon Food Processing Co., Ltd.)
5 parts by weight Ethanol 20 parts by weight Water 100 parts by weight The above material was stirred and dissolved to obtain impregnation component 7.
The total impregnation ratio of hydroxylpropylated β-dextrin and β-cyclodextrin with respect to the total amount of the core was 1.2% by weight.
<実施例8>
白色焼成芯体
ベントナイト 20重量部
窒化硼素 50重量部
塩化ビニル樹脂 10重量部
ジオクチルフタレ−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
上記配合を配合物として、ニ−ダ−及び3本ロ−ルにより十分混練後、細線状に押し出し成形し、空気中で180℃まで加熱し、更に、不活性雰囲気で1000℃に加熱し、そして空気中で500℃に加熱して呼び径0.5mm白色の焼成芯体を得た。この白色焼成芯体を含浸成分1中に室温で24時間浸漬後、表面上の余分な含浸成分を除去して80℃温風乾燥を12時間した(芯体全量に対するα−シクロデキストリンの含浸率は、1.8重量%であった。)。
前記含浸成分を含む白色焼成芯体を、赤色インク中に浸し、70℃で24時間放置し、アルコ−ルなどで表面の余分なインクを除去して赤色の色鉛筆芯とした。
<Example 8>
White fired core bentonite 20 parts by weight Boron nitride 50 parts by weight Vinyl chloride resin 10 parts by weight Dioctyl phthalate 10 parts by weight Stearic acid 2 parts by weight Methyl ethyl ketone 30 parts by weight After sufficiently kneading with a roll, it is extruded into a thin line, heated to 180 ° C. in air, further heated to 1000 ° C. in an inert atmosphere, and heated to 500 ° C. in air to obtain a nominal diameter of 0.00. A 5 mm white fired core was obtained. This white fired core was immersed in impregnation component 1 at room temperature for 24 hours, and then the excess impregnation component on the surface was removed, followed by drying at 80 ° C. with warm air for 12 hours (the impregnation rate of α-cyclodextrin with respect to the total amount of the core) Was 1.8% by weight.)
The white fired core containing the impregnated component was immersed in red ink and allowed to stand at 70 ° C. for 24 hours, and excess ink on the surface was removed with alcohol or the like to obtain a red colored pencil core.
<比較例1>
実施例1において含浸成分1を使用しなかった以外は実施例1と同様にして鉛筆芯を得た。
<Comparative Example 1>
A pencil lead was obtained in the same manner as in Example 1 except that the impregnation component 1 was not used in Example 1.
<比較例2>
実施例1においてα−シクロデキストリンをポリビニルアルコ−ル(KL−05、日本合成化学工業(株)製)に換えた以外は実施例1と同様にして鉛筆芯を得た。
芯体全量に対するポリビニルアルコ−ルの含浸率は、1.4重量%であった。
<Comparative example 2>
A pencil lead was obtained in the same manner as in Example 1 except that α-cyclodextrin was changed to polyvinyl alcohol (KL-05, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) in Example 1.
The impregnation rate of polyvinyl alcohol with respect to the total amount of the core was 1.4% by weight.
<比較例3>
実施例8において含浸成分1を使用しなかった以外は実施例8と同様にして赤色の色鉛筆芯を得た。
<Comparative Example 3>
A red colored pencil lead was obtained in the same manner as in Example 8 except that the impregnation component 1 was not used in Example 8.
<比較例4>
実施例2において、含浸成分2を下記含浸成分9に換えた以外実施例2と同様にして鉛筆芯を得た。
<含浸成分9>
ヒドロキシルプロピル化β−デキストリン(セルデックスHP−β−CD、日本食品加工(株)製) 0.5重量部
エタノ−ル 100重量部
上記材料を攪拌溶解させて含浸成分9とした。
芯体全量に対するヒドロキシルプロピル化β−デキストリンの含浸率は、0.08重量%であった。
<Comparative Example 4>
In Example 2, a pencil lead was obtained in the same manner as in Example 2 except that the impregnation component 2 was replaced with the following impregnation component 9.
<Impregnation component 9>
Hydroxylpropylated β-dextrin (Seldex HP-β-CD, manufactured by Nippon Food Processing Co., Ltd.) 0.5 parts by weight Ethanol 100 parts by weight
The impregnation ratio of hydroxylpropylated β-dextrin with respect to the total amount of the core was 0.08% by weight.
<比較例5>
実施例5において、含浸成分5を下記含浸成分10に換えて含浸温度を室温から60℃で、含浸と乾燥を5回繰り返した以外実施例5と同様にして鉛筆芯を得た。
<含浸成分10>
γ−シクロデキストリン(セルデックスG−100、日本食品加工(株)製)
100重量部
水 100重量部
上記材料を60℃で攪拌溶解させ含浸成分5とした。
芯体全量に対するγ−シクロデキストリンの含浸率は、33.0重量%であった。
<Comparative Example 5>
In Example 5, a pencil lead was obtained in the same manner as in Example 5 except that the impregnation component 5 was changed to the following impregnation component 10 and the impregnation temperature was from room temperature to 60 ° C. and the impregnation and drying were repeated 5 times.
<Impregnation component 10>
γ-cyclodextrin (Seldex G-100, manufactured by Nippon Food Processing Co., Ltd.)
100 parts by weight Water 100 parts by weight The above material was stirred and dissolved at 60 ° C. to obtain impregnation component 5.
The impregnation rate of γ-cyclodextrin with respect to the total amount of the core was 33.0% by weight.
以上、各実施例及び比較例により得られた鉛筆芯についてJIS S 6005に準じて曲げ強さと筆跡の濃度を測定した。また、各例で得た鉛筆芯それぞれ100本測定での平均曲げ強さ求めた。その結果を表1に示す。 As described above, the bending strength and the handwriting density were measured in accordance with JIS S 6005 for the pencil cores obtained in each of the examples and comparative examples. Moreover, the average bending strength in the measurement of 100 pencil leads obtained in each example was determined. The results are shown in Table 1.
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JP2008254959A (en) * | 2007-04-04 | 2008-10-23 | Pentel Corp | Porous carbon article and method for producing the same |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5614569A (en) * | 1979-07-12 | 1981-02-12 | Pilot Ink Co Ltd | Aqueous ink |
JPH02173076A (en) * | 1988-12-24 | 1990-07-04 | Tombow Pencil Co Ltd | Lead for mechanical pencil |
JP2005239900A (en) * | 2004-02-26 | 2005-09-08 | Pentel Corp | Pencil lead |
JP2006152183A (en) * | 2004-11-30 | 2006-06-15 | Pentel Corp | Pencil lead |
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2006
- 2006-08-31 JP JP2006236890A patent/JP5114895B2/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5614569A (en) * | 1979-07-12 | 1981-02-12 | Pilot Ink Co Ltd | Aqueous ink |
JPH02173076A (en) * | 1988-12-24 | 1990-07-04 | Tombow Pencil Co Ltd | Lead for mechanical pencil |
JP2005239900A (en) * | 2004-02-26 | 2005-09-08 | Pentel Corp | Pencil lead |
JP2006152183A (en) * | 2004-11-30 | 2006-06-15 | Pentel Corp | Pencil lead |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008254959A (en) * | 2007-04-04 | 2008-10-23 | Pentel Corp | Porous carbon article and method for producing the same |
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