JPS63270798A - Lubricating mold release agent - Google Patents

Lubricating mold release agent

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Publication number
JPS63270798A
JPS63270798A JP10434887A JP10434887A JPS63270798A JP S63270798 A JPS63270798 A JP S63270798A JP 10434887 A JP10434887 A JP 10434887A JP 10434887 A JP10434887 A JP 10434887A JP S63270798 A JPS63270798 A JP S63270798A
Authority
JP
Japan
Prior art keywords
water
powder
mold release
release agent
lubricating
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.)
Granted
Application number
JP10434887A
Other languages
Japanese (ja)
Other versions
JPH0681839B2 (en
Inventor
Toshihiko Funabashi
敏彦 船橋
Takahisa Koshida
孝久 越田
Ryoji Uchimura
良治 内村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Original Assignee
Kawasaki Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Priority to JP62104348A priority Critical patent/JPH0681839B2/en
Publication of JPS63270798A publication Critical patent/JPS63270798A/en
Publication of JPH0681839B2 publication Critical patent/JPH0681839B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

PURPOSE:To provide a lubricating mold release agent which forms a uniform coating having excellent lubricating and mold release properties on the surface of a material at room temp. to high temps. and does not pollute the working environment, which comprises water and, dispersed therein, BN powder, a water- soluble phosphate salt and a colloidal silica. CONSTITUTION:A lubricating mold release agent is obtd. by dispersing 1-35wt.% BN powder (a) having a primary particle average size of 0.5-20mum, an amt. of 2-100, in terms of the wt. ratio of a/b (anhydride), of a water-soluble phosphate salt (b) (e.g., water-soluble magnesium phosphate), and 0.1-20wt.%, in terms of the amt. of SiO2, of a colloidal silica (c) comprising dispersed particles of SiO2 (hydrate) having a size of 1-1,000nm in water (e) in the presence of a dispersant (d) (e.g., sodium ligninsulfonate). This agent is applied to the surface of a material at room temp. to high temps., e.g., 300 deg.C, and dried, thereby obtaining a coating of 100mum or less in thickness.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、窒化硼素(以下BNと称する)粉末を用いた
耐熱性を有する高温用固体潤滑あるいは離型剤の用途に
供する水分散組成物に関するものである。
[Detailed Description of the Invention] [Industrial Application Field] The present invention provides an aqueous dispersion composition that uses boron nitride (hereinafter referred to as BN) powder and is used as a heat-resistant solid lubricant for high temperatures or as a mold release agent. It is related to.

〔従来の技術〕[Conventional technology]

本発明の潤滑離型剤は、主として、アルミニウムまたは
アルミニウム合金の押出成形時の高温固体潤滑剤、ある
いはアルミニウムダイキャスト等の高温金型離型剤とし
て用いられるもので、従来この種の潤滑離型剤としては
、黒鉛粉末を分散させた油性もしくは水性のエマルジョ
ン型のものが使用されている。このような従来の黒鉛粉
末−有機バインダー系潤滑離型剤の場合、次のような多
くの欠点を有していた。
The lubricating mold release agent of the present invention is mainly used as a high-temperature solid lubricant during extrusion molding of aluminum or aluminum alloy, or as a mold release agent for high-temperature molds such as aluminum die casting. As the agent, an oil-based or water-based emulsion type agent in which graphite powder is dispersed is used. Such conventional lubricating mold release agents based on graphite powder and organic binder have many drawbacks as follows.

すなわち、 (・l) 黒鉛はアルミニウムあるいはその合金と反応
し易く、潤滑剤もしくは離型剤として使用した場合、ア
ルミニウムあるいはその合金表面に熱間においてA14
 C3等の化合物を形成し、押出成形、鋳込成形したア
ルミニウム製品の欠陥の生成につながる。
That is, (・l) Graphite easily reacts with aluminum or its alloys, and when used as a lubricant or mold release agent, A14 is applied to the surface of aluminum or its alloys while hot.
It forms compounds such as C3, leading to defects in extruded and cast aluminum products.

(2) 有機バインダは200℃以上に熱せられた場合
、分解して多量のガスを発生し、アルミニラムダイキャ
スト製品などの表面に多孔質の欠陥部を生起させる。
(2) When an organic binder is heated to 200° C. or higher, it decomposes and generates a large amount of gas, causing porous defects on the surface of aluminum die-cast products and the like.

(3)   (2’)において述べたように発生した多
諺のガスおよび黒色の黒鉛粉末は、作業環境を極端に悪
化させる。
(3) As mentioned in (2'), the gas and black graphite powder generated extremely deteriorate the working environment.

上記問題点を解決するために特開昭55−29506号
公報において開示されるように、BN粉末を主体とする
高温金型離型剤が提案されている。BN粉末を下体とす
るこのような潤滑離型剤により、前述の(1)〜(3)
に示した問題点はかなり解決できる。しかし、150℃
以上の高温となった被塗布表面の場合、必ずしも均一で
良好な塗膜は形成されない。また、150℃以下で塗膜
が形成されたとしても、それを300℃以上に加熱した
場合、剥離してしまう場合が多いという欠点を有してい
た。
In order to solve the above-mentioned problems, a high-temperature mold release agent mainly containing BN powder has been proposed as disclosed in Japanese Patent Application Laid-Open No. 55-29506. With such a lubricating mold release agent whose base material is BN powder, the above-mentioned (1) to (3) can be achieved.
The problems shown can be solved to a large extent. However, 150℃
If the surface to be coated is heated to a temperature higher than that, a uniform and good coating film will not necessarily be formed. Furthermore, even if a coating film is formed at 150° C. or lower, it often peels off when heated to 300° C. or higher.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

本発明の目的は、従来の黒鉛粉末−有機バインダ系潤滑
離型剤、あるいは黒鉛粉末の代わりにBN粉末を配合し
た離型剤における前述の問題点を解決し、常温から高温
までの任意の温度の材料表面に塗布しても、均一な塗膜
を形成し、しかも作業環境の汚染のない潤滑雛型剤を提
供することにある。
The purpose of the present invention is to solve the above-mentioned problems in conventional graphite powder-organic binder-based lubricating mold release agents or mold release agents containing BN powder instead of graphite powder, and to solve It is an object of the present invention to provide a lubricating template agent that forms a uniform coating film even when applied to the surface of a material and does not contaminate the working environment.

〔問題点を解決するための手段〕[Means for solving problems]

本発明者らは、BN粉末を各種無機バインダーからなる
組成物を調合し、種々の温度の被塗布表面にスプレーに
て塗布し、形成された塗膜の性状、潤滑性等を調べた結
果、BN粉末、水溶性リン酸塩およびコロイド状シリカ
を含有する水分散組成物によって最も均一な塗膜が形成
され、潤滑性、離型性も優れることを見出し、本発明を
完成した。
The present inventors prepared a composition consisting of BN powder and various inorganic binders, applied it by spray to the surface to be coated at various temperatures, and investigated the properties, lubricity, etc. of the formed coating film. The inventors completed the present invention by discovering that a water-dispersed composition containing BN powder, water-soluble phosphate, and colloidal silica forms the most uniform coating film and has excellent lubricity and mold release properties.

本発明の具体的構成は、窒化硼素粉末、水溶性リン酸塩
およびコロイド状シリカを含有する水分散組成物であっ
て、窒化硼素粉末は一次粒子のモ均粒径が0.5〜20
7tmで、かつ水分散組成物中の濃度が1〜35重9%
、窒化硼素粉末と水溶性リン酸塩との混合比が窒化硼素
粉末/水溶性リン酸塩(無水物)の重量比で表わして2
〜100で、コロイド状シリカの水分散組成物中の濃度
がSiO2で表して0.1〜20重量%で、残部が水お
よび分散剤とから成ることを特徴とする潤滑離型剤であ
る。
A specific configuration of the present invention is an aqueous dispersion composition containing boron nitride powder, water-soluble phosphate, and colloidal silica, wherein the boron nitride powder has a primary particle diameter of 0.5 to 20.
7tm, and the concentration in the aqueous dispersion composition is 1 to 35% by weight.
, the mixing ratio of boron nitride powder and water-soluble phosphate is 2, expressed as the weight ratio of boron nitride powder/water-soluble phosphate (anhydride).
~100, the concentration of colloidal silica in the aqueous dispersion composition is from 0.1 to 20% by weight expressed as SiO2, with the remainder consisting of water and a dispersant.

〔作用〕[Effect]

以下、本発明の詳細な説明する。 The present invention will be explained in detail below.

/を発明の水分散組成物が潤滑性および!!#型性機能
を有するのは、基本成分として配合するBN粉末の性質
によるものである。BNは黒鉛と類似の層状化合物で、
かつ化学的にもAn等に対して安定した性質を有してい
る。n滑性機能は層状化合物の層間の滑りから発現する
。#型性は主としてA文等の金属との反応性と大きく関
係し、黒鉛と比べてBNの方が溶融AUとの反応性は低
く、黒鉛粉末を用いるよりもBN粉末を用いた方が離型
性が優れている。
/ The water dispersion composition of the invention has lubricity and! ! The #-type function is due to the properties of the BN powder blended as a basic component. BN is a layered compound similar to graphite.
Moreover, it has chemically stable properties against An and the like. The lubricating function is developed from the sliding between layers of layered compounds. # Shape is largely related to the reactivity with metals such as A-type, and BN has lower reactivity with molten AU than graphite, and it is better to use BN powder than graphite powder to release it. Excellent formability.

本発明においては、配合するBN粉末の粒度を1次粒子
のモ均粒径として0.5〜20p−mに限定する。平均
粒径が0.51Lmより小さいと、BN粉末の潤滑性の
発現が困難であり、20μmを越えると、分散剤を添加
しても水中に均一に分散させることが困難となる。
In the present invention, the particle size of the BN powder to be blended is limited to 0.5 to 20 p-m as the average particle size of the primary particles. If the average particle size is smaller than 0.51 Lm, it will be difficult for the BN powder to exhibit lubricity, and if it exceeds 20 μm, it will be difficult to uniformly disperse it in water even if a dispersant is added.

本発明においては、BN粉大の水分散m成物の濃度を1
〜35重量%に限定する。BN粉の前記濃度が1重量%
より小さくても、35重敬%を越えても、均一塗布が困
難となり、共に離型性が不良となる。
In the present invention, the concentration of the water-dispersed m component of the size of BN powder is 1
-35% by weight. The concentration of BN powder is 1% by weight
Even if it is smaller or exceeds 35%, uniform coating will be difficult and mold releasability will be poor in both cases.

本発明においては、BN粉末のバインダとして水溶性リ
ン酸塩を用いる。水溶性リン酸塩の種類については特に
限定されないが、リン酸ナトリウム、リン酸カリウム、
リン酸アンモニウムのほか、水溶性のリン酸マグネシウ
ム、リン酸アルミニウム、リン酸亜鉛等も好適に使用さ
れる。水溶性リン酸塩はBN粉末の水分散組成物中に完
全に溶解し、水分散組成物が被塗布面上で乾炸するとバ
インダとなり、潤滑性を有するBN粉末を塗膜中に均一
に安定に保持し、塗膜として潤滑性、薄型性機能を付与
するためである。
In the present invention, a water-soluble phosphate is used as a binder for the BN powder. The type of water-soluble phosphate is not particularly limited, but sodium phosphate, potassium phosphate,
In addition to ammonium phosphate, water-soluble magnesium phosphate, aluminum phosphate, zinc phosphate, etc. are also preferably used. The water-soluble phosphate is completely dissolved in the water-dispersed composition of BN powder, and when the water-dispersed composition is dried on the surface to be coated, it becomes a binder, and the BN powder with lubricating properties is uniformly stabilized in the coating film. This is to provide the coating film with lubricity and thinness.

本発明においては、BN粉末と水溶性リン酸塩の配合比
をBN粉末/水溶性リン酸塩(無水物)の毛闇−比で表
して2〜100に限定する。重量比が2よりも小さいと
無機バインダとしての水溶性リン酸塩が多すぎてBN粉
末の潤滑性 離型性機能よりも水溶性リン酸塩の被膜の
機能が出てしまい1本発明の目的とする潤滑離型剤とし
ては使えない、逆に重量比が100よりも多いと、無機
バインダの!Aが少な過ぎて、塗膜中にBN粉末を保持
することができないので潤滑離型剤としての機tF、を
出すことができない。
In the present invention, the blending ratio of BN powder and water-soluble phosphate is limited to 2 to 100, expressed as a BN powder/water-soluble phosphate (anhydride) ratio. If the weight ratio is less than 2, there will be too much water-soluble phosphate as an inorganic binder, and the function of the water-soluble phosphate film will be greater than the lubricity and mold release function of the BN powder, which is the object of the present invention. It cannot be used as a lubricating mold release agent.On the other hand, if the weight ratio is more than 100, the inorganic binder! Since the amount of A is too small and the BN powder cannot be retained in the coating film, it is not possible to release the BN powder as a lubricating mold release agent.

本発明は、以上述べたBN粉末、水溶性リン酸塩に加え
て、さらにコロイド状シリカを配合する。本発明におけ
るコロイド状シリカとは、粒径が1〜lo00nmのS
 i 02またはその水和物の分散状f島にある粒子で
、このようなコロイド状シリカを配合する目的は、Si
O2成分を塗膜中に均一に分散させることにより、塗膜
の均一性、均質性を向トさせることにある。さらに水溶
性リン酸塩のバインダ中にSiO2J&分が固溶するこ
とにより、塗膜の耐熱性も上げることができる。
In the present invention, in addition to the BN powder and water-soluble phosphate described above, colloidal silica is further blended. In the present invention, colloidal silica refers to S with a particle size of 1 to 000 nm.
The purpose of blending such colloidal silica with particles in the dispersed f-islands of i02 or its hydrates is to
The objective is to improve the uniformity and homogeneity of the coating film by uniformly dispersing the O2 component in the coating film. Furthermore, the heat resistance of the coating film can also be improved by solidly dissolving SiO2J& in the water-soluble phosphate binder.

本発明においては、コロイド状シリカを0.1〜201
(、+j’%配合する。配合量が0.1−% a%より
も低いと配合する効果がなく、20重量%よりも多いと
、SiO2の多い硬質塗膜しか形成されず。
In the present invention, colloidal silica is used in a range of 0.1 to 201
(, +j'% is blended. If the blending amount is lower than 0.1-% a%, there is no effect of blending, and if it is higher than 20% by weight, only a hard coating film containing a large amount of SiO2 is formed.

潤滑性のある塗膜ができない。A coating film with lubricating properties cannot be formed.

本発明においては、前記のBN粉末と水溶性リン酸塩と
コロイド状シリカを水に分散あるいは溶解して水分散組
成物の潤滑離型用塗布剤とするが、その他、少量の分散
剤を添加する。分散剤は、BN粉末を一様に水に分散さ
せるために添加するもので、通常の界面活性剤の作用を
するものが使用される0本発明においては分散剤の種類
は特に限定されないが、例えばリグニンスルホン酸ソー
ダ、カルボキシルメチルセルロースが使用可能で、その
量は1重量%以下が好適である。
In the present invention, the above-mentioned BN powder, water-soluble phosphate, and colloidal silica are dispersed or dissolved in water to form a lubricating mold release coating agent for an aqueous dispersion composition, and a small amount of a dispersant is also added. do. The dispersant is added to uniformly disperse the BN powder in water, and any one that acts as a normal surfactant is used. In the present invention, the type of dispersant is not particularly limited, but For example, sodium lignin sulfonate and carboxymethyl cellulose can be used, and the amount thereof is preferably 1% by weight or less.

本発明の潤滑離型剤は、BN粉末笠の各原料をボールミ
ル等で均一に混合し、水分散相としたスラリー状態とし
て調合され、刷毛塗りも可能であるし、スプレーにて塗
布してもよい、塗布膜の厚みは経済性も考慮して、乾燥
後で100gm以下が好適である。
The lubricating mold release agent of the present invention is prepared by uniformly mixing each raw material of BN powder in a ball mill, etc., and preparing it as a slurry with a water dispersed phase, and can be applied by brushing or spraying. The thickness of the coating film after drying is preferably 100 gm or less, taking economic efficiency into consideration.

本発明の潤滑離型剤は、100℃前後の低温度から30
0℃以上の高温度の材料表面にまで塗布可能で、密着性
のよい均一な塗膜が形成される。
The lubricating mold release agent of the present invention can be used at temperatures as low as 30 degrees
It can be applied to material surfaces at high temperatures of 0°C or higher, and a uniform coating film with good adhesion is formed.

すなわち潤滑性、離型性といった目的、あるいは被塗布
材料の温度などの条件に合わせて、最適の、BN粉末の
1次粒子の平均粒径および添加量、水溶性リン酸塩の種
類、BN粉末/水溶性リン酸塩(無水物)の重量比、分
散剤の種類および添加量およびスラリー濃度が適宜選択
可能である。
In other words, depending on the objectives such as lubricity and mold releasability, and conditions such as the temperature of the material to be coated, the optimum average particle diameter and amount of primary particles of BN powder, type of water-soluble phosphate, and BN powder are determined. /Water-soluble phosphate (anhydride) weight ratio, type and amount of dispersant added, and slurry concentration can be selected as appropriate.

〔実施例〕 1次粒子の平均粒径が4.5pmのBN粉末を用い、第
1表に示した各種組成のBN粉末−水溶性リン酸マグネ
シウム−コロイド状シリカ系の水分散組成物を調合し、
ステンレス板表面に約50gmの膜厚となるように塗布
し、得られた塗膜の外観を調べた。さらに摩擦摩耗試験
機を用いたリングオンリングテストにより潤滑性を調べ
、次に700℃の溶融Anに塗膜つきのステンレス板を
侵漬し、塗膜と溶融A立との反応性により離型性も評価
した。結果を比較例と共に第1表に示す。
[Example] Using BN powder with an average primary particle diameter of 4.5 pm, BN powder-water-soluble magnesium phosphate-colloidal silica water dispersion compositions having various compositions shown in Table 1 were prepared. death,
It was applied to the surface of a stainless steel plate to a film thickness of about 50 gm, and the appearance of the resulting coating film was examined. Furthermore, the lubricity was investigated by a ring-on-ring test using a friction and wear tester, and then the stainless steel plate with the coating was immersed in molten An at 700°C, and the releasability was determined by the reactivity between the coating and the molten Al. was also evaluated. The results are shown in Table 1 along with comparative examples.

第1表から明らかなように、本発明の水分散組成物から
なる潤滑離型剤を用いることにより、摩擦係数の小さい
潤滑性に優れ、かつ溶融A文との反応性の低い離型性に
優れた塗膜が形成できる。
As is clear from Table 1, by using the lubricating mold release agent made of the aqueous dispersion composition of the present invention, it has excellent lubricity with a small friction coefficient and mold releasability with low reactivity with molten A material. Excellent coating film can be formed.

〔発明の効果〕〔Effect of the invention〕

本発明のBN粉末−水溶性リン酸塩−コロイド状シリカ
系の水分散組成物を用いることにより、常温から高温ま
での任意の温度の材料表面に塗布しても、均一な潤滑性
、離型性に優れた塗膜が形成でき、しかも作業環境の汚
染のない潤滑離型剤を提供することができた。
By using the BN powder-water-soluble phosphate-colloidal silica water dispersion composition of the present invention, uniform lubricity and mold release can be achieved even when applied to the material surface at any temperature from room temperature to high temperature. It was possible to provide a lubricating mold release agent that can form a coating film with excellent properties and does not contaminate the working environment.

Claims (1)

【特許請求の範囲】 1 窒化硼素粉末、水溶性リン酸塩およびコロイド状シ
リカを含有する水分散組成物であって、窒化硼素粉末は
一次粒子の平均粒径が 0.5〜20μmで、かつ水分散組成物中の濃度が1〜
35重量%、窒化硼素粉末と水溶性リン酸塩との混合比
が窒化硼素粉末/水溶性リン酸塩(無水物)の重量比で
表わして2〜100で、コロイド状シリカの水分散組成
物中の濃度がSiO_2で表して0.1〜20重量%で
、残部が水および分散剤とから成ることを特徴とする潤
滑離型剤。
[Scope of Claims] 1. An aqueous dispersion composition containing boron nitride powder, water-soluble phosphate, and colloidal silica, wherein the boron nitride powder has an average primary particle diameter of 0.5 to 20 μm, and The concentration in the aqueous dispersion composition is from 1 to
35% by weight, a mixing ratio of boron nitride powder and water-soluble phosphate is 2 to 100 expressed as a weight ratio of boron nitride powder/water-soluble phosphate (anhydride), and a colloidal silica water dispersion composition. A lubricating mold release agent characterized in that the concentration thereof in SiO_2 is 0.1 to 20% by weight, with the remainder consisting of water and a dispersant.
JP62104348A 1987-04-30 1987-04-30 Lubricant release agent Expired - Lifetime JPH0681839B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62104348A JPH0681839B2 (en) 1987-04-30 1987-04-30 Lubricant release agent

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62104348A JPH0681839B2 (en) 1987-04-30 1987-04-30 Lubricant release agent

Publications (2)

Publication Number Publication Date
JPS63270798A true JPS63270798A (en) 1988-11-08
JPH0681839B2 JPH0681839B2 (en) 1994-10-19

Family

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004315762A (en) * 2003-04-21 2004-11-11 Chiyoda Chemical Kk Water dispersion type metal working agent composition and method for producing the same
JP4659220B2 (en) * 1999-03-05 2011-03-30 株式会社Moresco Water-based lubricating release agent composition for plastic working
CN108300534A (en) * 2018-02-26 2018-07-20 东莞市翔通光电技术有限公司 The insulation optical receptacle of kollag and preparation method thereof and embedded kollag
CN108913318A (en) * 2018-07-25 2018-11-30 刘滔 A kind of concrete parting agent and preparation method thereof
KR20210031755A (en) 2018-08-07 2021-03-22 덴카 주식회사 Hexagonal boron nitride powder, and method for producing hexagonal boron nitride powder
JP2022027958A (en) * 2017-11-01 2022-02-14 株式会社Moresco Lubricant composition for plastic working
KR20220103699A (en) 2019-11-19 2022-07-22 덴카 주식회사 Hexagonal Boron Nitride Powder

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52150422A (en) * 1976-06-09 1977-12-14 Toyo Glass Co Ltd Lubricating release agent
JPS595534A (en) * 1982-06-30 1984-01-12 松下電工株式会社 Electronic circuit mounting relay

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52150422A (en) * 1976-06-09 1977-12-14 Toyo Glass Co Ltd Lubricating release agent
JPS595534A (en) * 1982-06-30 1984-01-12 松下電工株式会社 Electronic circuit mounting relay

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4659220B2 (en) * 1999-03-05 2011-03-30 株式会社Moresco Water-based lubricating release agent composition for plastic working
JP2004315762A (en) * 2003-04-21 2004-11-11 Chiyoda Chemical Kk Water dispersion type metal working agent composition and method for producing the same
JP2022027958A (en) * 2017-11-01 2022-02-14 株式会社Moresco Lubricant composition for plastic working
CN108300534A (en) * 2018-02-26 2018-07-20 东莞市翔通光电技术有限公司 The insulation optical receptacle of kollag and preparation method thereof and embedded kollag
CN108913318A (en) * 2018-07-25 2018-11-30 刘滔 A kind of concrete parting agent and preparation method thereof
KR20210031755A (en) 2018-08-07 2021-03-22 덴카 주식회사 Hexagonal boron nitride powder, and method for producing hexagonal boron nitride powder
KR20220103699A (en) 2019-11-19 2022-07-22 덴카 주식회사 Hexagonal Boron Nitride Powder

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