JPS6067578A - Pencil lead - Google Patents

Abstract

PURPOSE:To provide a pencil lead having high strength, produced by filling montan wax to the pore of a sintered product composed of boron nitride and carbon, giving a clear written mark having excellent fixability and resistant to staining caused by rubbing with hand or a ruler, and suitable for a pencil for drawing film as well as common pencil. CONSTITUTION:The objective pencil lead is produced by impregnating montan wax to the pore of a sintered product composed of boron nitride and carbon and obtained e.g. by kneading and forming boron nitride and a carbonizable organic compound such as asphalt, and calcining the mixture in an inert gas. The porosity of the sintered product is preferably 15-60%. The montan wax can be produced from asphalten brown coal by high-temperature distillation or solvent extraction, and is preferably a wax containing the hexacosyl ester, etc. of a 20- 30C fatty acid, free acid, and resin.

Description

【発明の詳細な説明】 この発明は、腕成黒鉛芯の強度を有し、筆跡が鮮明で、
かつ筆跡の定着性に愛Ａ、手や定規の擦過による汚れを
改讐し、待如製図フィルム用として好適に用いられる鉛
芯に関するものである。[Detailed Description of the Invention] This invention has the strength of an arm-formed graphite core, provides clear handwriting,
The present invention also relates to a lead core that has excellent handwriting fixability, prevents stains caused by hand or ruler scratches, and is suitable for use in drafting films.

製図用フィルムは、ポリエステル等のフィルムベースの
表面を／ｌｌ工して卓６己可能としたものであり耐楽品
江、耐擺性、耐熱性にすぐｆｌ、、かつ文人で破慣し難
いなどの数々の利点を有している製図用戯である。この
製図用フィルムに、従来からの焼成黒鉛芯？用いて筆記
した場診、筆記腺が鮮明で、消去性も良好であるものの
、製図用フィルムと′４跡との定着性が者しく悪く１作
図中に手や定規をスライドさせることによって図面が非
常に汚れ易い欠点があった。つまり１通常の紙において
はａｍどうしが複雑に絡み合った構造となっているので
、鉛芯の芯粉が繊維中に入り込み、そのため多少こすっ
ても汚れにくいのであるが、製図用フィルムの噛合はフ
ィルム表面が均一な凹凸であるために、速記された芯粉
は単に積層さ力、た形となり、汚れ易いのである。従っ
て、製図用フィルムに用いらｎる鉛芯の′特性としては
、竜記−の鮮明さ、良好な消去性、良好なコピー性は勿
論のこと２手や定規の際過によるカｎ、の生じないもの
が要求され１％如設計製図に２ける図面上の汚れは攻防
的欠陥となるため、フィルムとの定着性の凌れた。つま
り粘着性のある鉛芯が望まれている。Drafting film is made by processing the surface of a film base such as polyester to make it easy to use.It is durable, has excellent scratch resistance, heat resistance, and is difficult to break even among writers. It is a drawing game that has many advantages such as. Does this drafting film have a conventional fired graphite core? Although the field examination and writing glands written using the paper are clear and the erasability is good, the fixation between the drawing film and the '4 marks is clearly poor, and drawings can be erased by sliding the hand or ruler during one drawing. It had the disadvantage that it got dirty very easily. In other words, 1. Normal paper has a structure in which ams are intricately intertwined, so the core powder of the lead core gets into the fibers, so it does not get dirty easily even if rubbed a little, but the interlocking of the drafting film is Because the surface is uniformly uneven, the shortened core powder simply forms a layered shape and is easily stained. Therefore, the characteristics of the lead core used in drafting film include sharpness, good erasability, and good copyability, as well as the ability to prevent scratches caused by two hands or a ruler. Since stains on drawings such as 1% or less are required to be free of stains and become a defensive defect, the fixability with the film was superior. In other words, a sticky lead core is desired.

このような考え方の鉛芯のひとつとして、ワックス類又
は樹脂類と顔料および体質材とからなる無腕成芯が知ら
れている。この無腕成芯で４＃Ｅ記した場合には、ワッ
クス類あるいは樹脂類が定着性に好ましいので１手や定
規のスライドによる汚れは殆ど生じなめ。しかしながら
無焼成芯は詳明な筆記巌が得られず、従ってコピー性が
悪く、シかも消去性が悪いこと、ｙには曲げ強度が焼成
黒鉛芯に比べ、半分あるいはそれ以−ドの性ｍｌである
ため、現状では２．０〜０．９ｍｌ〆の径の芯が限度で
あり、＃図フィルム用芯として王に使われている０゜５
〜０−’：５’ｍＴｌダの細芯では、実用上の傾度がな
く使用できない。As one type of lead core based on this concept, an armless lead core is known that is made of waxes or resins, pigments, and extenders. When marking 4#E with this armless core, waxes or resins are preferable for fixing properties, so there is almost no staining caused by hand or sliding of a ruler. However, the unfired lead does not provide a clear writing surface, has poor copyability, and has poor erasability. Therefore, the current limit is a core with a diameter of 2.0 to 0.9ml, and 0゜5, which is commonly used as a core for #diagram film, is the limit.
~0-': A fine core of 5' mTl has no practical slope and cannot be used.

本発明者は上記の問題点、特忙筆跡の汚れ、および定着
性について考察し、１．筆跡の汚れの原因となる黒色顔
料の割合な鉛芯の焼結体の組成から減する。２．定着性
を増すために製図用フィルムとの接着力の強い粘ノ置物
を鉛芯の焼結体の気孔中に充填する。この２点について
の具現化Ｋｇ意検討を重ねた。The present inventor considered the above-mentioned problems, dirt on special handwriting, and fixability, and 1. The proportion of black pigment, which causes handwriting stains, is reduced from the composition of the lead core sintered body. 2. In order to improve fixation, the pores of the lead-core sintered body are filled with sticky objects that have strong adhesion to the drafting film. We have repeatedly considered the implementation of these two points.

その結果、潤滑材としての窒化硼素と結合材としての抜
系、すなわち炭菓化注有慎化合物が癩成後に生成した炭
素とからなる鉛芯が、ｄ常の焼成黒鉛芯と比較して書味
が良好で１強度は遜色なく強く、かつ汚れ嬢いことを児
い出したのである。As a result, a lead core consisting of boron nitride as a lubricant and carbon as a binder, that is, carbon produced after leprosy of the charcoal compound, was found to be more effective than a conventional calcined graphite core. We have created a product that has a good taste, is as strong as 1 strength, and does not stain easily.

すなわち、この発明の鉛芯の潤滑材である４化硼木は、
硬度が小さく（モース硬度２）、かつ黒鉛と同様に良好
な＠ｔ＃幼米を有するので、この発明の芯は４味が良い
。また１度の強い鉛芯を侍るためには炭素化性有機化合
物とともに不活性カス中において高温で史成し炭素化す
る必−髪があるがこの点、窒化硼素は朽１５００℃まで
の高温に耐え、炭素化工程（５００Ｃ〜１１００℃）に
おいてその潤滑性Ｋまったく影響なく強度の強い窒化硼
素と炭素より成る・充結体？侍ることができる。In other words, the lubricant for the lead core of this invention, 4-kabogi, is
The core of this invention has a good taste because it has low hardness (Mohs hardness 2) and good @t# young rice like graphite. In addition, in order to withstand a strong lead core of 1°C, it must be formed and carbonized together with carbonizable organic compounds at high temperatures in an inert scum. A compact made of strong boron nitride and carbon that withstands and has no effect on its lubricity during the carbonization process (500C to 1100C)? I can attend.

また屋化４Ｉｌｌｌ索は白色ではあるが隠賑力が啄めて
弱く、白色顔料としての効用がな（、むしろ体質材的で
あるために、この窒化硼素と炭素から成るＳ＝体は生成
した炭素の色、つまり黒色をしてｂるロ 一方、従来の焼成黒鉛芯は一般に結合材としての炭素化
性有機化合物、＠滑材および着色顔料としての煕姶、４
曾により黒体を壇すための顔料としてのカーボンブラッ
クを使用し、濁成後においては焼結体の組成のほとんど
が着色力の大さな黒色顔料であり、これで筆記した際に
出る芯粉を擦過すれば大変汚れたものとなる。In addition, although Yaka 4Illll is white, it has very weak visual power and is not useful as a white pigment (rather, since it is a substance-like substance, this S = body consisting of boron nitride and carbon is not formed). On the other hand, conventional calcined graphite cores generally contain a carbonizable organic compound as a binder, a lubricant as a lubricant, and a pigment as a coloring pigment.
Carbon black is used as a pigment to form a black body, and after turbidity, most of the composition of the sintered body is a black pigment with great coloring power, and this creates the core that appears when writing. If you rub the powder, it will become very dirty.

これに対して、この発明の鉛芯の諦結体の組成中で黒い
蕾色顔料となるものは前述の通り、ｇｉ成の際忙生成し
た炭素のみであり、汚れの最大の原因となる黒色顔料の
割合が従来の焼成黒鉛芯の焼結体の幻１／３程度と少く
、この発明の鉛芯で簀かれた筆跡は黒いがそこから出る
芯粉に言まれる着色顔料の割合が少ないために、これが
擦過されても汚れが少ないものと考察される。On the other hand, as mentioned above, the black bud-colored pigment in the composition of the lead-core aggregate of this invention is only the carbon produced during GI formation, and the black color is the biggest cause of staining. The proportion of pigment is only about 1/3 of that of the sintered body of conventional fired graphite cores, and the handwriting captured by the lead core of this invention is black, but the proportion of colored pigments in the core powder produced from it is small. Therefore, it is considered that there is little dirt even if this is rubbed.

１Ｇ本発明者は定着性において、無夾成芯と遜色のない
鉛芯を目的として、窒化硼素と炭素より成る焼結体の気
孔中に含浸する種々のワックスについて検討を行なった
結果、モンタンワックスが奴多くのワックスの中でも製
図用フィルムへの定着性が浚れていることに着目し、こ
の発明を完成したものである。1G With the aim of creating a lead core that is comparable to a non-containing core in terms of fixing properties, the inventors have studied various waxes that can be impregnated into the pores of a sintered body made of boron nitride and carbon, and found that montan wax. This invention was developed by focusing on the fact that among the many waxes out there, it has poor fixing properties on drafting film.

すなわちモンタンワックスとはアスファルト質のカッ炭
を高温で蒸１１１または溶剤で抽出して得られるワック
スで、その成分としてはＣ２ｏ　〜０５０の脂肪酸とテ
トラコシル、ヘキサコシル、オクタコシル、トリコンタ
ニルアルコール等トのエステルをゴみ、インドリコサン
酸、インペンタコサン酸、イソへブタコサン酸、イソノ
ナコサン酸。In other words, montan wax is a wax obtained by steaming asphaltic charcoal at high temperature or extracting it with a solvent, and its components include C2o ~ 050 fatty acids and esters such as tetracosyl, hexacosyl, octacosyl, and tricontanyl alcohols. Garbage, indricosanoic acid, inpentacosanoic acid, isohebutacanoic acid, isononacosanoic acid.

インヘントリアコンタン酸等の遊離酸および樹脂を多く
含むワックスであり、他のワックスを充填した焼成黒鉛
芯に比して、製図用フィルム上に筆記した具合、これに
よく喰い付き、定着性が良好である。しかも無焼成芯の
ように不均一な４４とならない。また１手や定規のよう
な平滑な面に対しては粘着性が弱く１手で触れても一般
のワックスのようなベトベトした感じが少ないという特
徴を有する。また常温ではこのモンタンワックスは塑性
変形しにくい固さではあるが軟化点（８２℃）以上では
低粘度となり、窒化硼素と炭素から成る焼結体の気孔内
に容易に含浸することができる。It is a wax containing a large amount of free acids such as inhentriacontanoic acid and resin, and compared to calcined graphite cores filled with other waxes, it sticks to drawing films better and has better fixation properties. In good condition. Moreover, unlike unfired cores, the core does not become uneven. Additionally, it has a weak adhesion to smooth surfaces such as hands or rulers, so even when touched with one hand, it does not feel sticky like regular wax. Furthermore, although this montan wax is hard enough to resist plastic deformation at room temperature, it has a low viscosity above its softening point (82°C) and can easily be impregnated into the pores of a sintered body made of boron nitride and carbon.

以上のように、この発明の鉛芯は窒化硼素および炭素か
ら成る焼結体と該焼結体の気孔内に光横されているモン
タンワックスとから構成されていることを待機とするも
のであり、窒化硼素と縦木およびモンタンワックスとの
組み合せから、これらの相乗効朱により、強度が大で、
４Ｆ休が良く。As described above, the lead core of the present invention is composed of a sintered body made of boron nitride and carbon and montan wax that is spread in the pores of the sintered body. , the combination of boron nitride, vertical wood and montan wax has a synergistic effect of vermilion, which gives it great strength.
4th floor rest is good.

しかも製図用フィルムに壜記した鳴せ、毫記歳が鮮明で
かつ′ポ宥性に優れ６手や定規の擦過による汚れがほと
んどない画期的な製図フィルム用芯が得られるのである
。Moreover, it is possible to obtain an innovative core for drafting film in which the markings and marks recorded on the drafting film are clear, and the core is excellent in tolerability and is almost free from stains caused by scratches from hands or rulers.

次にこの祐明の鉛芯について具体的釦述べるとこの発明
の鉛芯を構成する炭素は、炭素化性有機化合物を不活性
ガス中、５００℃以上の尚胤で完成した際忙生成した炭
素であり、尿素化性有機化合物としては、天然樹脂１合
成ｍ　ｌｉｌ、アスファルト、コールタールピッチ等を
単独もしくは組みあわせたものが用いられる。Next, I will talk about Yumei's lead core in detail.The carbon that makes up the lead core of this invention is the carbon that was generated when a carbonizable organic compound was completed in Naotane at 500℃ or higher in an inert gas. As the urea-formable organic compound, natural resin 1 synthetic ml, asphalt, coal tar pitch, etc. may be used alone or in combination.

４化硼素と炭素とから成る焼結体の気孔率は１５〜６０
％の範囲が走者性が良く好ましい。The porosity of the sintered body made of boron tetraride and carbon is 15 to 60.
% range is preferable because it provides good runner properties.

気孔率が１５４以ｆではモンタンワックスの光・Ａ電が
少なすぎ１足＃性のｗ４者な向上が期待できず、６０％
以上では婉結体の強１斐が弱くなり仇れ易い。If the porosity is 154 or more, the light and A-electronic properties of the montan wax are too small to expect a significant improvement in 1-pair # properties, and 60%
In this case, the strength of the unit becomes weak and it is easy to be defeated.

この発明における気孔率の測定は、浸透性の良Ｌｎｇ体
（たとえばベンジルアルコール）を鉛芯の気孔に吸収さ
せ、吸収させた液体の各１を鉛芯の嵩容積で除し、６分
率で表わしたものである。The porosity in this invention is measured by absorbing a highly permeable LNG substance (for example, benzyl alcohol) into the pores of a lead core, dividing each part of the absorbed liquid by the bulk volume of the lead core, and calculating the ratio by 6 parts. It is expressed.

気孔率（見かけの気孔率） 鉛　芯　の　４／ｇ　答　槓 ＃３−ｗｚ 但しＷｌは液体を吸収させる前の鉛芯の乾１ｅｆｔ６Ｗ
２は気孔中に液体を吸収させた鉛芯のその液体中におけ
る直着。Porosity (apparent porosity) 4/g of lead core Answer: #3-wz However, Wl is the drying rate of the lead core before absorbing liquid 1ef6W
2 is a lead core with liquid absorbed into its pores that is directly attached to the liquid.

Ｗ３は液体を鉛芯の電孔中Ｋｌ及収させたのちの鉛芯の
兼看。W3 is a double inspection of the lead core after the liquid is collected in the lead core's electric hole.

次にこの発明の鉛芯の製造法について間単に述べる。窒
化硼素と、焼成して炭素化する有機化合物を任意の溶剤
または加熱により、俗解あるいは溶融し、三本ロールや
ニーダ−を用いて混ＮＲ１押出成型したのち、不活性ガ
ス中で１０００℃前後の高温で跣成し、有機化合物を炭
素化させて、窒化硼素と炭素とから成る焼結体を得る。Next, a method for manufacturing the lead core of the present invention will be briefly described. Boron nitride and an organic compound that is carbonized by firing are melted or melted using any solvent or by heating, and mixed NR1 extrusion molded using a triple roll or kneader, and then heated at around 1000℃ in an inert gas. The organic compound is carbonized at a high temperature to obtain a sintered body composed of boron nitride and carbon.

次Ｋ　ＩＩられた焼結体の気孔中にモンタンワックスを
力ｎ熱、リロ圧、減圧等の手段により、一定時間浸透さ
せて製図フィルム用芯とする。Next, montan wax is infiltrated into the pores of the sintered body for a certain period of time by means of force, heat, relo pressure, reduced pressure, etc. to form a core for drafting film.

次にこの発明の実施例を述べる。（部は重曖部である。Next, embodiments of this invention will be described. (The part is a heavy ambiguous part.

） 実施例１ 窒化硼素を４６部とプローンアスファルトネ２０〜３０
を５５部とを加熱混岬し、押出成型したのち不活性ガス
甲で常温〜１１００℃まで２０℃／ｈｒで昇温し、１１
００℃で１時間焼成して窒化硼素と炭素から成る焼結体
が得られた。この焼結体の気孔率は３０チであった。次
にモンタンワックスＱ１２０℃に加熱溶融し、この中に
焼結体を８時間浸漬して気孔内部にモンタンワックスを
吸収充填させたのち、焼結体表面のモンタンワックスを
トリクロールエタンで加熱洗浄して完成芯とした。) Example 1 46 parts of boron nitride and 20 to 30 parts of plain asphalt
After heating and mixing with 55 parts of
After firing at 00° C. for 1 hour, a sintered body consisting of boron nitride and carbon was obtained. The porosity of this sintered body was 30 inches. Next, montan wax Q was heated and melted at 120°C, and the sintered body was immersed in this for 8 hours to absorb and fill the pores with montan wax.Then, the montan wax on the surface of the sintered body was heated and washed with trichloroethane. It was made into a completed core.

比較？ｌｌ１ 実用的ｌと同じ焼結体を作成し、その洲結体の気孔中に
パラフィンワックスを充填させた。Comparison? ll1 Practical A sintered body similar to 1 was prepared, and the pores of the sintered body were filled with paraffin wax.

比較例２ 黒鉛５５部と、ブローンアスファルト９２０〜３０を４
５部とを用いて実施例１と同様の製法にて焼結体を作成
した。この焼結体の気孔率は２日チであった。次にその
洲結体の気孔中に実施例１と同じモンタンワックスを光
横させた。Comparative Example 2 55 parts of graphite and 4 parts of blown asphalt 920-30
A sintered body was produced using the same manufacturing method as in Example 1 using 5 parts. The porosity of this sintered body was 2 days. Next, the same montan wax as in Example 1 was spread into the pores of the sintered body.

上記実ｍ？！ｌ　ｌ　、比較例１．２および焼成黒鉛芯
。The above actual m? ! l l , Comparative Example 1.2 and calcined graphite core.

無充成芯について性能を比較すると表１の通りである。Table 1 shows a comparison of the performance of unfilled cores.

（注）曲は強度、皐砿＃ｆｋ数の測定は、Ｊ工Ｓの８６
０１９の測定法に準する。(Note) The song is strength, and the measurement of Koto #fk number is 86 of J Engineering S.
According to the measurement method of 019.

　０ 汚れ技は、製図用フィルム紙上において一定何市で１か
れた筆記部の反射率をＡ。0 The stain technique is A, which is the reflectance of the writing part drawn at a certain number of points on the drafting film paper.

康記圃を一定乗件でこすり、該筆記部外の汚れた紙面の
反射率をＢとＩ−て。Rub the paper at a constant rate and measure the reflectance of the dirty paper surface outside the writing area as B and I.

としてめた。数値が小さい程汚ｆｉ度合が少ない。I thought so. The smaller the value, the lower the degree of dirtiness.

これから明らかなように、この発明の実施９１Ｊ　１の
鉛芯は充成黒鉛芯と同８度の強い曲げ強度を有しｉ無島
成芯のｆＪ２倍である。また皐凛係数においても無焼成
芯よりもはるかに小さな数１１１！でありなめらかで焼
成黒鉛芯と近似した４Ｆ味である。As is clear from this, the lead core according to Embodiment 91J 1 of the present invention has a strong bending strength of 8 degrees, which is the same as that of the filled graphite core, and has fJ twice as high as that of the solid graphite core. Also, the Ririn coefficient is 111, which is much smaller than the unfired core! It is smooth and has a 4F taste similar to that of fired graphite core.

また汚れ度においては、無崗成芯と同程度に優れたもの
であり、焼成黒鉛芯と比較すれば明らかに汚れ度合が少
ない。In terms of dirtiness, it is as good as a non-granite core, and the dirtiness is clearly lower than that of a calcined graphite core.

また比較例ＩＫあるように窒化硼素と炭素とから成る焼
結体であっても光項物が非積着性であればき層性が者し
く悪く、汚れ度が大きい。Further, as in Comparative Example IK, even if the sintered body is made of boron nitride and carbon, if the optical material is non-adhesive, the layer properties are significantly poor and the degree of staining is high.

一方比較？！Ｉ　２　Ｋあるように充填物が積層性であ
　１ つても黒鉛と炭素から成る癩結体であれば、たとえ定着
性が良好で蒼跡から出る芯粉は少な（とも黒鉛と炭素が
着色力の−大きな黒色顔料であるために煽過による汚７
″Ｌ、度合が太さくず層性の良さも実効が少ない。Comparison on the other hand? ! If the filler is laminated like I2K, and even if it is leprosy consisting of graphite and carbon, even if the fixing property is good and the amount of core powder coming out from the blue mark is small (both graphite and carbon have high coloring power). - Due to the large black pigment, stains due to agitation 7
″L, the degree is thick and the good quality of the crumb layer is less effective.

以上のように夫婦？！Ｉ　１および比４！５！例１．２
から窒化硼素と炭素より成る焼結体と該気孔中に范鷹す
しているモンタンワックスとの相乗効果により顕著な汚
れ）（合の１．Ｘ善がもたらさｎ、ていることがわかる
。Couple like above? ! I 1 and ratio 4!5! Example 1.2
It can be seen that the synergistic effect of the sintered body made of boron nitride and carbon and the montan wax present in the pores causes significant staining (1.X improvement of the combination).

これから明らかなように、この発明り鉛芯は。As will be clear from this, this invented lead core.

製図用フィルムに筆記した時に、従来の焼成黒鉛芯の定
着性の恕さ、汚れ易い欠点を改善し、従来のｓ腕成芯の
強度の弱さ、ｆ禾の重さを解決し。When writing on drafting film, it improves the shortcomings of the conventional calcined graphite core, such as poor fixability and easy smudging, and solves the weak strength and heavy weight of the conventional s-arm core.

焼成黒鉛芯の強吠、＃味の良さを有し、無焼成芯に匹敵
する定着性の長さ、汚れの少なさを実現した一１期的な
製図フィルム用芯であり、その実用的１ＴｊｆＪ１直は
きわめて大である。This is the 11th generation core for drafting film that has the strong taste of a fired graphite core, has a long fixing time comparable to an unfired core, and has less dirt, and its practical 1TjfJ1 Directness is extremely important.

なお強！斐が強いので０．２〜０．７１程度の細い芯径
のシャープペンシル用芯として最適であるが。Still strong! Because of its strong strength, it is ideal as a mechanical pencil lead with a small lead diameter of about 0.2 to 0.71 mm.

　２ もちろんそれ以上の芯径のシャープペンシル用芯。2 Of course, a mechanical pencil lead with a lead diameter larger than that.

鉛磨用芯としても用いることができる。It can also be used as a lead polishing lead.

特許用１娘人　パイロットプレシジョン株式会社　３Patent 1 Daughter Pilot Precision Co., Ltd. 3

Claims (1)

【特許請求の範囲】 １、　窯化硼素と炭素より成る腕結体と、該焼結体ノ気
孔中に光鷹されているモンタンワックスとから構成され
て成る鉛芯。 ２、廃結体の気孔率が、１５〜６０チであることを特徴
とする特許請求の範囲第１項記載の鉛芯。[Claims] 1. A lead core composed of an arm body made of sintered boron and carbon, and montan wax that is optically fused into the pores of the sintered body. 2. The lead core according to claim 1, wherein the waste aggregate has a porosity of 15 to 60 cm.