JPH01111706A - Production of carbonaceous hollow spheres - Google Patents
Production of carbonaceous hollow spheresInfo
- Publication number
- JPH01111706A JPH01111706A JP62267823A JP26782387A JPH01111706A JP H01111706 A JPH01111706 A JP H01111706A JP 62267823 A JP62267823 A JP 62267823A JP 26782387 A JP26782387 A JP 26782387A JP H01111706 A JPH01111706 A JP H01111706A
- Authority
- JP
- Japan
- Prior art keywords
- pitch
- spheres
- sphere
- hollow
- weight
- 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
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 239000011295 pitch Substances 0.000 claims abstract description 44
- 239000002344 surface layer Substances 0.000 claims abstract description 10
- 239000011339 hard pitch Substances 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 230000001590 oxidative effect Effects 0.000 claims abstract description 7
- 238000010304 firing Methods 0.000 claims abstract description 4
- 238000010000 carbonizing Methods 0.000 claims abstract description 3
- 230000003647 oxidation Effects 0.000 claims description 17
- 238000007254 oxidation reaction Methods 0.000 claims description 17
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 15
- 239000007791 liquid phase Substances 0.000 claims description 10
- 239000012071 phase Substances 0.000 claims description 10
- 238000003763 carbonization Methods 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 17
- 239000007789 gas Substances 0.000 description 11
- 239000006185 dispersion Substances 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 239000002994 raw material Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 239000012298 atmosphere Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000011162 core material Substances 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000002706 hydrostatic effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 238000002679 ablation Methods 0.000 description 1
- 239000011358 absorbing material Substances 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000011280 coal tar Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000005087 graphitization Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000000048 melt cooling Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- FGHSTPNOXKDLKU-UHFFFAOYSA-N nitric acid;hydrate Chemical compound O.O[N+]([O-])=O FGHSTPNOXKDLKU-UHFFFAOYSA-N 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 239000012286 potassium permanganate Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Landscapes
- Carbon And Carbon Compounds (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は高温断熱材、浮力材、電磁波シールド材、ｆｆ
ｒ！Ｉ吸収材、発熱体、音響機器触媒担体、アブレーシ
ョン材等の原料として用いられる炭素質中空球体の簡便
な製造方法に関するものである。[Detailed description of the invention] <Industrial application field> The present invention is applicable to high temperature insulation materials, buoyancy materials, electromagnetic shielding materials, ff
r! The present invention relates to a simple method for manufacturing carbonaceous hollow spheres used as raw materials for I-absorbing materials, heating elements, audio equipment catalyst carriers, ablation materials, etc.
〈従来技術とその問題点〉
従来、炭素質中空球体を得る方法としては、特公昭４９
−３０２５３号、特公昭５３−１８９９５号、特公昭５
０−２９８３７号等が報告されている。<Prior art and its problems> Conventionally, as a method for obtaining carbonaceous hollow spheres,
-30253, Special Publication No. 53-18995, Special Publication No. 18995
No. 0-29837 etc. have been reported.
特公昭４９−３０２５３号、特公昭５３−１８９９５号
に高芳香族性硬ピッチに対し、ピッチに相溶性を有する
低沸点有機溶剤を混合させ、該溶液を加圧水中で分散し
、得られた微粒子を発泡させ、ピッチ中空球体となす方
法が記載されている。 この方法は該ピッチ中空球体を
不融化、炭化することにより、炭素質中空球体とするも
のである。According to Japanese Patent Publication No. 49-30253 and Japanese Patent Publication No. 53-18995, highly aromatic hard pitch is mixed with a low-boiling organic solvent that is compatible with the pitch, and the solution is dispersed in pressurized water, resulting in fine particles. A method is described for foaming pitch hollow spheres. In this method, the pitch hollow spheres are made infusible and carbonized to form carbonaceous hollow spheres.
ところが製造方法が複雑であるため、得られた炭素質中
空球体は高価なものになる。 又、直径が１ ｍｍ以上
の大きなものを作ることができなかった。However, since the manufacturing method is complicated, the obtained carbonaceous hollow spheres are expensive. Moreover, it was not possible to make large ones with a diameter of 1 mm or more.
特公昭５０−２９８３７号に記載された方法は、芯材と
なる有機高分子球体のまわりにピッチ等をバインダーを
用いて被覆して造粒し、それを焼成することにより炭素
中空球体を得るものであるが、この方法では殻の厚い高
強度のものは得られるが、芯材を用いるため粒径の小さ
なものを得ることができない。In the method described in Japanese Patent Publication No. 50-29837, carbon hollow spheres are obtained by coating pitch or the like with a binder around an organic polymer sphere serving as a core material, granulating it, and firing it. However, although this method allows obtaining high-strength products with thick shells, it is not possible to obtain products with small particle sizes because a core material is used.
〈発明の目的〉
本発明は上述した従来の技術の欠点を解決しようとする
もので、製造方法が簡便であり、炭素質中空球体の大き
さ、殻厚を自由に調整でき、又、強度を大きくすること
ができることにより、樹脂のフィラーとして用いる場合
、たとえば押出し成形などの高ぜん断力のかかる成形に
も適用が可能な炭素質中空体を製造する方法を提供する
ものである。<Objective of the Invention> The present invention is intended to solve the above-mentioned drawbacks of the conventional technology, and has a simple manufacturing method, the size and shell thickness of carbonaceous hollow spheres can be freely adjusted, and strength can be increased. By being able to increase the size of the carbonaceous hollow body, the present invention provides a method for producing a carbonaceous hollow body that can be applied to molding that requires high shear force, such as extrusion molding, when used as a resin filler.
〈発明の構成〉
本発明は軟化開始温度が１００℃〜３８０℃、ベンゼン
不溶分が１３重量％〜９０重量％の硬ピッチを気相また
は液相中に滴下分散させてピッチ球体となし、該ピッチ
球体の表面層を気相または液相で酸化し、さらに、中空
化後炭化し、必要に応じて黒鉛化することを特徴とする
炭素質中空球体の製造方法を提供するものである。<Structure of the Invention> The present invention involves dropwise dispersing hard pitch having a softening start temperature of 100°C to 380°C and a benzene insoluble content of 13% to 90% by weight into a gas phase or liquid phase to form pitch spheres. The present invention provides a method for manufacturing carbonaceous hollow spheres, which comprises oxidizing the surface layer of pitch spheres in a gas phase or liquid phase, and further carbonizing after hollowing, and graphitizing if necessary.
好ましくは、前記、該ピッチ球体の表面層の気相又は液
相での酸化が、該ピッチ球体の重量増が５重量％〜２０
重量％の範囲になるような酸化処理であれば良い。Preferably, the oxidation of the surface layer of the pitch sphere in a gas phase or liquid phase results in a weight increase of 5% to 20% by weight of the pitch sphere.
Any oxidation treatment may be used as long as the oxidation treatment falls within the range of % by weight.
又、好ましくは、前記、中空化後炭化が５００℃〜７０
０℃の温度で該ピッチ球体を急速加熱し揮発分を揮散さ
せ中空球体となし、しかる後に９００℃〜２０００℃の
温度で焼成するとすれば良い。Preferably, the carbonization after hollowing is 500°C to 70°C.
The pitch sphere may be rapidly heated at a temperature of 0°C to volatilize volatile components to form a hollow sphere, and then fired at a temperature of 900°C to 2000°C.
以下、本発明について詳細に説明する。The present invention will be explained in detail below.
本発明でもちいる原料硬ピッチはフローテスターでの軟
化開始温度が１００℃〜３８０℃の範囲でなければなら
ない。 軟化開始温度が１００℃未満の硬ピッチを用い
れば、ピッチ球体の表面層の酸化処理が困難となる。
軟化開始温度が３８０℃を越える硬ピッチでは滴下分散
処理が困難であり、特に空気中へ滴下分散させる場合に
この傾向が著しい。The raw material hard pitch used in the present invention must have a softening start temperature in a flow tester range of 100°C to 380°C. If a hard pitch with a softening start temperature of less than 100° C. is used, it will be difficult to oxidize the surface layer of the pitch sphere.
With hard pitches whose softening start temperature exceeds 380° C., dropwise dispersion treatment is difficult, and this tendency is particularly noticeable when dispersing dropwise into the air.
原料硬ピッチのベンゼン不溶分は１３重量％〜９０重量
％の範囲にある必要がある。 ベンゼン不溶分が１３％
未満のピッチではピッチ球体の表面層の酸化処理が困難
となり、ベンゼン不溶分が９０重量％を超えるピッチで
は、滴下分散を実際上行なうことができないからである
。The benzene-insoluble content of the raw material hard pitch must be in the range of 13% to 90% by weight. Benzene insoluble content is 13%
This is because if the pitch is less than 90% by weight, it becomes difficult to oxidize the surface layer of the pitch sphere, and if the benzene insoluble content exceeds 90% by weight, dropwise dispersion cannot actually be carried out.
上述したような原料ピッチの滴下分散処理によりピッチ
球体を形成する。Pitch spheres are formed by dropping and dispersing raw material pitch as described above.
原料ピッチの滴下分散処理は気相中、液相中のいずれに
も行なうことができる。 気相中への分散方法としては
、ノズルからスプレーする方法がある。 この方法では
、ノズル孔径、スプレー圧力を変えることにより、広範
囲な粒径のものを得ることができる。 液相中への滴下
分散方法としては溶融ピッチを多孔質板から水中へ滴下
する方法がある。The dropwise dispersion treatment of the raw material pitch can be carried out either in the gas phase or in the liquid phase. As a method of dispersing into the gas phase, there is a method of spraying from a nozzle. In this method, a wide range of particle sizes can be obtained by changing the nozzle hole diameter and spray pressure. As a method of dropwise dispersion into the liquid phase, there is a method of dropping molten pitch into water from a porous plate.
しかしながら、分散方法としては必ずしもこれらの方法
に限定されるものではない。However, the dispersion method is not necessarily limited to these methods.
上記分散処理により得られたピッチ球体の表面層の酸化
処理は気相あるいは液相のいずれによっても可能である
。 気相での酸化処理は酸化性気体中において回転ドラ
ム中にピッチ球体を入れ、回転させながら加熱すること
によりおこなうのが良い。 酸化性気体としては空気、
オゾン、ＮＯ２、Ｓ０３等のガスもしくはこれらを混合
したものが用いられるがこれに限定されるものではない
。The surface layer of the pitch sphere obtained by the above-mentioned dispersion treatment can be oxidized in either the gas phase or the liquid phase. The oxidation treatment in the gas phase is preferably carried out by placing the pitch sphere in a rotating drum in an oxidizing gas and heating it while rotating. Air is an oxidizing gas,
Gases such as ozone, NO2, S03, or a mixture thereof may be used, but the gas is not limited thereto.
液相での酸化処理は酸化性液体中にピッチ球体を浸しピ
ッチ成分を酸化することによりおこなう。 酸化性液体
としては、硫酸、硝酸、過マンガン酸カリ液等が用いら
れるがこれに限定されるものではない。The oxidation treatment in the liquid phase is carried out by immersing the pitch sphere in an oxidizing liquid to oxidize the pitch component. As the oxidizing liquid, sulfuric acid, nitric acid, potassium permanganate solution, etc. are used, but are not limited thereto.
これらの酸化剤を用いた酸化処理では、求める炭素質中
空球体の嵩密度（殻厚）、強度等の品質に応じて酸化の
程度を決定する必要がある。 高強度の炭素質中空球体
を得るためには、酸化を進行させてやらねばならず、殻
厚が薄く軽量なものを得るためには酸化の程度を不融化
が進む範囲で極力おさえてやる必要がある。In oxidation treatment using these oxidizing agents, it is necessary to determine the degree of oxidation depending on the quality of the desired carbonaceous hollow spheres, such as bulk density (shell thickness) and strength. In order to obtain high-strength carbonaceous hollow spheres, oxidation must proceed, and in order to obtain thin and lightweight shells, it is necessary to suppress the degree of oxidation to the extent that infusibility progresses as much as possible. There is.
ピッチ球体の酸化による重量増加率は５重量％〜２０重
量％の範囲にあることが好ましい。 ５重量％未満であ
れば、後工程において球体同士が中空化せず融着しやす
くなり、２０重量％を越えてピッチ球体内部まで酸化を
おこなうと、ピッチ球体の一部燃焼が始る。The weight increase rate of the pitch spheres due to oxidation is preferably in the range of 5% to 20% by weight. If it is less than 5% by weight, the spheres will not become hollow in the subsequent process and will easily fuse together, and if it exceeds 20% by weight and oxidation is carried out to the inside of the pitch sphere, part of the pitch sphere will begin to burn.
上記の表面層を酸化したピッチ球体は好ましくは５００
℃〜７００℃の温度雰囲気中に装入して揮発分を揮発さ
せることにより中空化をおこなわせる。 急速加熱はあ
らかじめ５００〜７００℃に保持された電気炉中にピッ
チ球体を搬入して行なうのがよい。The pitch sphere whose surface layer is oxidized is preferably 500
Hollowing is performed by charging the material into an atmosphere at a temperature of .degree. C. to 700.degree. C. and volatilizing volatile components. Rapid heating is preferably carried out by transporting the pitch sphere into an electric furnace previously maintained at 500 to 700°C.
雰囲気は不活性ガス雰囲気として、０．０１〜１時間程
度処理をおこなう。 ５００℃未満の場合は中空化が
不十分であり、７００℃を越える場合は揮発分の揮発が
急速すぎてピッチ球体が割れやすくなるため中空球体の
収率が低下する。The treatment is performed for about 0.01 to 1 hour in an inert gas atmosphere. If the temperature is less than 500°C, hollowing will be insufficient, and if it exceeds 700°C, the volatile matter will evaporate too quickly and the pitch spheres will easily break, resulting in a decrease in the yield of hollow spheres.
中空化したピッチ中空球体は好ましくは９００℃〜２０
００℃で加熱する炭化、さらに必要に応じて黒鉛化する
ことにより炭素中空球体を得ることができる。The hollow pitch hollow sphere is preferably heated to 900°C to 20°C.
Carbon hollow spheres can be obtained by carbonization by heating at 00°C and further graphitization if necessary.
〈実施例〉
以下に本発明を実施例および比較例により具体的に説明
する。<Examples> The present invention will be specifically explained below using Examples and Comparative Examples.
（実施例−１および比較例−１）
コールタールを蒸留して得た軟化点１８６℃、ベンゼン
不溶分４２％の硬ピッチを塔高１５ｍの溶融ピッチを冷
却させて造粒する溶融冷却造粒装置により造粒し、粒子
径１０４〜８４０μｍのピッチ球体を得た。 その時に
用いたノズル径は０．８ｍｍ、加圧圧力５ ｋｇ／ｍ２
、ピッチ装入量１０ｋｇ、スプレー時における溶融ピッ
チの液温は２７３℃であった。(Example-1 and Comparative Example-1) Melt cooling granulation in which hard pitch obtained by distilling coal tar and having a softening point of 186°C and a benzene insoluble content of 42% is granulated by cooling a molten pitch with a tower height of 15 m. Particles were granulated using a device to obtain pitch spheres having a particle size of 104 to 840 μm. The nozzle diameter used at that time was 0.8 mm, and the pressure was 5 kg/m2.
The pitch charge amount was 10 kg, and the temperature of the molten pitch during spraying was 273°C.
該ピッチ球体のうち１０４〜１４９μｍのものを空気中
にて酸化処理をおこなう。 酸化温度を２７０℃、保持
時間０．８時間とすることで重量増加率３．１％とし、
酸化温度３００℃、保持時間をそれぞれ、１時間、２．
５時間、４時間とすることで重量増加率を５．２％、１
２．６％、１７．３％とした。Among the pitch spheres, those having a diameter of 104 to 149 μm are subjected to an oxidation treatment in air. By setting the oxidation temperature to 270°C and holding time to 0.8 hours, the weight increase rate was 3.1%,
Oxidation temperature: 300°C, holding time: 1 hour, 2.
By setting the time to 5 hours and 4 hours, the weight increase rate was 5.2%, 1
2.6% and 17.3%.
次にあらかじめ６５０℃の温度雰囲気とじた電気炉中に
３０分間放置し、中空化処理をした。 しかる後に１０
００℃まで炉の温度を上げ５時間炭化焼成し、炭素質中
空体を得た。Next, it was left to stand for 30 minutes in an electric furnace that had been closed to a temperature atmosphere of 650° C. to perform a hollowing treatment. then 10
The temperature of the furnace was raised to 00° C. and carbonization was carried out for 5 hours to obtain a carbonaceous hollow body.
重量増加率３．１％のものは中空化処理時に溶融して中
空化しなかった。The one with a weight increase rate of 3.1% melted during the hollowing process and did not become hollow.
該炭素質中空体の壁圧、粒子比重、静水圧強度を表１に
示す。Table 1 shows the wall pressure, particle specific gravity, and hydrostatic pressure strength of the carbonaceous hollow body.
表 １
（実施例−２および比較例−２）
実施例−１で得られた同様のピッチ球体を空気中で３０
０℃、１時間加熱することにより酸化をおこなわせた。Table 1 (Example-2 and Comparative Example-2) Similar pitch spheres obtained in Example-1 were heated in air for 30 minutes.
Oxidation was carried out by heating at 0° C. for 1 hour.
重量増加率は５．４％であった。The weight increase rate was 5.4%.
このピッチ球体をあらかじめ表２の中空化処理温度にし
ている電気炉中に３０分間放置し、中空化処理をした。This pitch sphere was left for 30 minutes in an electric furnace, which had been previously set to the hollowing temperature shown in Table 2, for hollowing treatment.
その後１０００℃で５時間焼成する炭化処理をおこな
い炭素質中空球体を得た。Thereafter, carbonization treatment was performed by firing at 1000° C. for 5 hours to obtain carbonaceous hollow spheres.
中空化処理を４００℃でおこなったものは中空化せず、
８００℃でおこなったものは割れが多かった。Those subjected to hollowing treatment at 400℃ do not become hollow,
There were many cracks in the test conducted at 800°C.
該炭素質中空体の特性を表２に示す。Table 2 shows the properties of the carbonaceous hollow body.
表 ２
（実施例−３）
実施例−１で得られたピッチ球体のうち１０４〜１４９
μｍのものを３０％硝酸水で５時間酸化処理し、その後
水洗乾燥した。 このとき、５．９重量％の増量があっ
た。 更 に６００℃まで急速昇温させ、３０分間保持
した後、１０００℃で５時間焼成を行ない炭素質中空球
体を得た。 該炭素質中空球体の壁厚は８μｍ、粒子比
重０ 、３２ｇ／ｃｍ３、静水圧強度１４０ ｋｇ／ｃ
ｍ２であった。Table 2 (Example-3) 104 to 149 of the pitch spheres obtained in Example-1
The μm sample was oxidized with 30% nitric acid water for 5 hours, and then washed with water and dried. At this time, there was an increase of 5.9% by weight. The temperature was further rapidly raised to 600°C, held for 30 minutes, and then fired at 1000°C for 5 hours to obtain carbonaceous hollow spheres. The carbonaceous hollow sphere has a wall thickness of 8 μm, a particle specific gravity of 0, 32 g/cm3, and a hydrostatic strength of 140 kg/c.
It was m2.
〈発明の効果〉
本発明による炭素質中空体の製造方法は製造方法が簡便
であり、炭素質中空体の大きさ、殻厚を自由に調整でき
、又、強度を大きくすることができるため、樹脂のフィ
ラーとして用いる場合、押出し成形が可能な炭素質中空
体を製造することができる。<Effects of the Invention> The method for manufacturing a carbonaceous hollow body according to the present invention is simple, the size and shell thickness of the carbonaceous hollow body can be freely adjusted, and the strength can be increased. When used as a resin filler, a carbonaceous hollow body that can be extruded can be manufactured.
Claims (3)
溶分が１３重量％〜９０重量％の硬ピッチを気相または
液相中に滴下分散させてピッチ球体となし、該ピッチ球
体の表面層を気相または液相で酸化し、さらに、中空化
後炭化し、必要に応じて黒鉛化することを特徴とする炭
素質中空球体の製造方法。(1) Hard pitch having a softening start temperature of 100°C to 380°C and a benzene insoluble content of 13% to 90% by weight is dropwise dispersed in a gas phase or liquid phase to form a pitch sphere, and the surface layer of the pitch sphere is A method for producing carbonaceous hollow spheres, which comprises oxidizing in a gas phase or liquid phase, further carbonizing after hollowing, and graphitizing if necessary.
化が、該ピッチ球体の重量増が５重量％〜２０重量％の
範囲になるような酸化処理である特許請求の範囲第１項
に記載の炭素質中空球体の製造方法。(2) The oxidation of the surface layer of the pitch sphere in a gas phase or liquid phase is an oxidation treatment such that the weight increase of the pitch sphere is in the range of 5% to 20% by weight. A method for producing a carbonaceous hollow sphere according to item 1.
該ピッチ球体を急速加熱し揮発分を揮散させ中空球体と
なし、しかる後に９００℃〜２０００℃の温度で焼成す
る特許請求の範囲第１項または第２項に記載の炭素質中
空球体の製造方法。(3) A claim in which the carbonization after hollowing is performed by rapidly heating the pitch sphere at a temperature of 500°C to 700°C to volatilize the volatile matter to form a hollow sphere, and then firing at a temperature of 900°C to 2000°C. A method for producing a carbonaceous hollow sphere according to item 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62267823A JPH01111706A (en) | 1987-10-23 | 1987-10-23 | Production of carbonaceous hollow spheres |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62267823A JPH01111706A (en) | 1987-10-23 | 1987-10-23 | Production of carbonaceous hollow spheres |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01111706A true JPH01111706A (en) | 1989-04-28 |
Family
ID=17450103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62267823A Pending JPH01111706A (en) | 1987-10-23 | 1987-10-23 | Production of carbonaceous hollow spheres |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01111706A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1164108A1 (en) * | 2000-06-13 | 2001-12-19 | Toda Kogyo Corporation | Hollow carbon particles and process for producing the same |
-
1987
- 1987-10-23 JP JP62267823A patent/JPH01111706A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1164108A1 (en) * | 2000-06-13 | 2001-12-19 | Toda Kogyo Corporation | Hollow carbon particles and process for producing the same |
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