CN102153067A - Method for preparing high-conductivity wood conductive carbon powder by catalyzing metal oxide - Google Patents
Method for preparing high-conductivity wood conductive carbon powder by catalyzing metal oxide Download PDFInfo
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- CN102153067A CN102153067A CN2010105925570A CN201010592557A CN102153067A CN 102153067 A CN102153067 A CN 102153067A CN 2010105925570 A CN2010105925570 A CN 2010105925570A CN 201010592557 A CN201010592557 A CN 201010592557A CN 102153067 A CN102153067 A CN 102153067A
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Abstract
The invention relates to a method for preparing high-conductivity wood conductive carbon powder by catalyzing a metal oxide, comprising the following steps of: firstly, screening sawdust or wood meal of wood to obtain the sawdust with the grain diameter range of 20-120 meshes; secondly, uniformly mixing metal oxide powder with the sawdust or wood meal in a mass ratio of (1-8):100; and finally, feeding the mixed powder in an alumina crucible in a high-temperature carbonization furnace, and under the environment condition of inertia gas, carbonizing and sintering the mixed powder. Therefore, the metal oxide can play a role of catalyzing the wood carbon powder to form a graphite layer structure, and thus the resitivity of the wood carbon power is reduced; by taking low-price sawdust or wood meal as raw materials, the cost for processing the sawdust or wood meal is low and further the cost is greatly reduced.
Description
Technical field
The present invention relates to the preparation method of the wooden powdered carbon of a kind of high conductivity, relate in particular to a kind of method for preparing wooden conduction powdered carbon by the metal oxide high-temperature catalytic.
Background technology
Along with the raising with people's living standard of developing rapidly of electronic industry, people also progressively improve the requirement of electro-conductive material.Conducting powder can be used as additive and joins in the raw materials such as plastics, coating, fiber, makes it have electroconductibility, thereby obtains the novel material that some have specific function, as electro-conductive material, electromagnetic shielding material, antistatic material, thermo electric material etc.Conducting powder commonly used mainly contains metal powder, carbon is powder, organic powder and metal oxide powder.Though metal powder and carbon are that the conductivity of powder is excellent, cost an arm and a leg; The organic conductive filler is non-refractory again, and is not corrosion-resistant again; There is the not good defective of electroconductibility mostly in the metal oxide powder.Therefore, the wooden conduction powdered carbon of a kind of high conductivity of exploitation preparation has broad application prospects.
As long as the past charcoal acts as a fuel and smelts use, utility value is lower, and charcoal is very active as the research and development of new function material in recent years, especially as the raw material of wood-charcoal material of high conductivity.The carbo lignius resistivity of conventional high temperature sintering is higher, still, complex process, sintering time is long, can not meet the need of market.As, Japanese patent of invention JP 2005035806, be that block charcoal or bamboo charcoal after the charing are prepared the method for electroconductibility charcoal or bamboo charcoal in secondary charing more than 1000 ℃, its resistivity is still up to 10 Ω cm.
The present invention proposes a kind of novel method for preparing wooden conduction powdered carbon, is raw material with sawdust or wood powder, is catalyzer with the metal oxide, prepares the wooden conduction powdered carbon of high conductivity through high temperature carbonization.Metal oxide can play the effect that the wooden powdered carbon of catalysis forms the graphite laminate structure, improves its electroconductibility, and the resistivity of gained powdered carbon can be reduced to below the 0.4 Ω cm.Can it prepare new function materials such as electromagnetic shielding material, antistatic material, thermo electric material as the conducting function unit.
Summary of the invention
The objective of the invention is to propose the method that a kind of metal oxide oxidation catalyst prepares the wooden conduction powdered carbon of high conductivity.Mainly being to be raw material with sawdust or wood powder, is catalyzer with the metal oxide, and metal oxide plays the effect that the wooden powdered carbon of catalysis forms the graphite laminate structure, prepares the wooden conduction powdered carbon of high conductivity through high temperature carbonization.
The technical solution adopted in the present invention is:
A kind of metal oxide oxidation catalyst prepares the method for the wooden conduction powdered carbon of high conductivity, and its step is,
1) sawdust is prepared: with the sawdust screening back acquisition particle size range of timber is 20 orders～120 purpose sawdust;
2) mixed powder preparation: with the mass ratio of metal oxide powder and sawdust is 1～8: 100 uniform mixing;
Then, the mixed powder of above-mentioned sawdust that has prepared and metal oxide is loaded in the alumina crucible, crucible is pushed into the heating tube middle part, and keeps nitrogen environment all the time;
3) carrying out high temperature carbonization handles: the mixed powder in the above-mentioned alumina crucible is placed the high temperature carbonization stove, under the inert gas environment condition, rise to 1100 ℃～1500 ℃ of carbonization temperatures with 1 ℃/minute～20 ℃/minute temperature rise rates, and under this temperature range, kept 0.5 hour～2 hours, above-mentioned mixed powder is carried out the high temperature carbonization sintering processes, make the wooden conduction powdered carbon of high conductivity at last.
A kind of metal oxide oxidation catalyst prepares the method for the wooden conduction powdered carbon of high conductivity, and its step is,
1) wood powder is prepared: with the wood powder screening back acquisition particle size range of timber is 20 orders～120 purpose wood powders;
2) mixed powder preparation: with the mass ratio of metal oxide powder and wood powder is 1～8: 100 uniform mixing;
Then, the mixed powder of above-mentioned wood powder that has prepared and metal oxide is loaded in the alumina crucible, crucible is pushed into the heating tube middle part, and keeps nitrogen environment all the time;
3) carrying out high temperature carbonization handles: the mixed powder in the above-mentioned alumina crucible is placed the high temperature carbonization stove, under the inert gas environment condition, rise to 1100 ℃～1500 ℃ of carbonization temperatures with 1 ℃/minute～20 ℃/minute temperature rise rates, and under this temperature range, kept 0.5 hour～2 hours, above-mentioned mixed powder is carried out the high temperature carbonization sintering processes, make the wooden conduction powdered carbon of high conductivity at last.
Described metal oxide powder is meant croci, nickel oxide powder or alumina powder.
Described sawdust or wood powder are sawdust or the wood powder of any seeds, also can be mixing sawdust or the wood powder of several seeds.
Metal oxide the invention has the beneficial effects as follows: owing to can play the effect that the wooden powdered carbon of catalysis forms the graphite laminate structure, reduce below resistivity to 0.4 ohmcm (Ω cm) of wooden powdered carbon, improve its conductivity, again owing to make raw material with cheap sawdust or wood powder, and be processed into sawdust or the wood powder expense is also lower, greatly reduce cost; Thereby, make the powdered carbon electric conductivity height, the good stability that make.
Embodiment
The invention will be further described below in conjunction with exemplary embodiments.
Metal oxide oxidation catalyst of the present invention prepares the method for the wooden conduction powdered carbon of high conductivity, and its step is as follows:
(1) sawdust or wood powder are prepared: it is the sawdust or the wood powder of 20 orders～120 orders (promptly 0.125 millimeter～0.83 millimeter) that the sawdust of any timber (as: with Cortex Populi Tomentosae wood) or wood powder screening back obtain particle size range;
Above-mentioned sawdust or wood powder can be sawdust or the wood powder of any seeds, also can be mixing sawdust or the wood powder of several seeds;
(2) mixed powder preparation: take by weighing a certain amount of sawdust or wood powder and metal oxide powder respectively, with sawdust or wood powder and metal oxide powder uniform mixing, wherein the scope of the mass ratio of metal oxide powder and sawdust or wood powder is 1～8: 100;
Above-mentioned metal oxide powder refers to croci, nickel oxide powder or alumina powder;
The mixed powder of the above-mentioned sawdust that has prepared or wood powder and metal oxide is loaded in the alumina crucible, for example: take by weighing the sawdust of 24.2302 grams and the nickel oxide (NiO of 2.1072 grams respectively, particle diameter 20 nanometers～30 nanometers) powder, pour in the container and stir, be loaded in the alumina crucible, crucible is pushed into the heating tube middle part, closes tongued and grooved flanges; Open nitrogengas cylinder, regulate the glass rotors gas meter, with nitrogen flow be controlled at 200 milliliters (mL)/minute, keep about 30 minutes, guarantee that above-mentioned heating inner air tube all discharges, in time taking gas-phase product out of, prevent wooden powdered carbon oxidation, keep nitrogen environment in the experimentation all the time;
(3) carrying out high temperature carbonization again handles: the mixed powder in the above-mentioned alumina crucible is placed the high temperature carbonization stove, under inert gas environment or vacuum condition, rise to 1100 ℃～1500 ℃ of carbonization temperatures with 1 ℃/minute～20 ℃/minute temperature rise rates, and under this temperature range, kept 0.5 hour～2 hours, above-mentioned mixed powder is carried out the high temperature carbonization sintering processes, make the wooden conduction powdered carbon of high conductivity at last.
Adopt the volume specific resistance of the wooden conduction powdered carbon of high conductivity of the present invention's making can be reduced to 0.02 Ω cm～0.34 Ω cm scope.
Characteristics of the present invention are as follows:
The one,, owing to use sawdust or wood powder to be catalyzer as raw material and metal oxide, make the mixed powder of above-mentioned preparation have the advantage of electroconductibility height and conduction good uniformity, can be used as the conducting function unit and prepare new function materials such as electro-conductive material, electromagnetic shielding material, antistatic material;
The 2nd, because sawdust or the wood powder prices of raw and semifnished materials are cheap, and be processed into sawdust or the wood powder expense is also low, therefore, the wooden conduction powdered carbon of the high conductivity of above-mentioned preparation has that cost is low, technology is simple, conductivity is excellent, is easy to the characteristics of suitability for industrialized production.
Claims (4)
1. a metal oxide oxidation catalyst prepares the method for the wooden conduction powdered carbon of high conductivity, it is characterized in that, its step is,
1) sawdust is prepared: with the sawdust screening back acquisition particle size range of timber is 20 orders～120 purpose sawdust;
2) mixed powder preparation: with the mass ratio of metal oxide powder and sawdust is 1～8: 100 uniform mixing;
Then, the mixed powder of above-mentioned sawdust that has prepared and metal oxide is loaded in the alumina crucible, crucible is pushed into the heating tube middle part, and keeps nitrogen environment all the time;
3) carrying out high temperature carbonization handles: the mixed powder in the above-mentioned alumina crucible is placed the high temperature carbonization stove, under the inert gas environment condition, rise to 1100 ℃～1500 ℃ of carbonization temperatures with 1 ℃/minute～20 ℃/minute temperature rise rates, and under this temperature range, kept 0.5 hour～2 hours, above-mentioned mixed powder is carried out the high temperature carbonization sintering processes, make the wooden conduction powdered carbon of high conductivity at last.
2. a metal oxide oxidation catalyst prepares the method for the wooden conduction powdered carbon of high conductivity, it is characterized in that, its step is,
1) wood powder is prepared: with the wood powder screening back acquisition particle size range of timber is 20 orders～120 purpose wood powders;
2) mixed powder preparation: with the mass ratio of metal oxide powder and wood powder is 1～8: 100 uniform mixing;
Then, the mixed powder of above-mentioned wood powder that has prepared and metal oxide is loaded in the alumina crucible, crucible is pushed into the heating tube middle part, and keeps nitrogen environment all the time;
3) carrying out high temperature carbonization handles: the mixed powder in the above-mentioned alumina crucible is placed the high temperature carbonization stove, under the inert gas environment condition, rise to 1100 ℃～1500 ℃ of carbonization temperatures with 1 ℃/minute～20 ℃/minute temperature rise rates, and under this temperature range, kept 0.5 hour～2 hours, above-mentioned mixed powder is carried out the high temperature carbonization sintering processes, make the wooden conduction powdered carbon of high conductivity at last.
3. prepare the method for the wooden conduction powdered carbon of high conductivity as claim 1,2 described metal oxide oxidation catalysts, it is characterized in that described metal oxide powder is meant croci, nickel oxide powder or alumina powder.
4. prepare the method for the wooden conduction powdered carbon of high conductivity as claim 1,2 described metal oxide oxidation catalysts, it is characterized in that described sawdust or wood powder are sawdust or the wood powder of any seeds, also can be mixing sawdust or the wood powder of several seeds.
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| CN2010105925570A CN102153067A (en) | 2010-12-16 | 2010-12-16 | Method for preparing high-conductivity wood conductive carbon powder by catalyzing metal oxide |
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| CN2010105925570A CN102153067A (en) | 2010-12-16 | 2010-12-16 | Method for preparing high-conductivity wood conductive carbon powder by catalyzing metal oxide |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104891479A (en) * | 2015-05-26 | 2015-09-09 | 中国林业科学研究院林产化学工业研究所 | Plant-based graphene and preparation method thereof |
| CN105905990A (en) * | 2016-04-29 | 2016-08-31 | 山西大学 | Water purifying material and preparation method thereof |
-
2010
- 2010-12-16 CN CN2010105925570A patent/CN102153067A/en active Pending
Non-Patent Citations (4)
| Title |
|---|
| 《The Japan Wood Research Society》 20031231 Song-Yung Wang et al "Electromagnetic shielding efficiency of the electric field of charcoal from six wood species" 第450-454页 1-3 , * |
| 《世界林业研究》 20071031 林兰英等 木材炭化与碳化物利用研究进展 22-26 1-4 第20卷, 第5期 * |
| SONG-YUNG WANG ET AL: ""Electromagnetic shielding efficiency of the electric field of charcoal from six wood species"", 《THE JAPAN WOOD RESEARCH SOCIETY》 * |
| 林兰英等: "木材炭化与碳化物利用研究进展", 《世界林业研究》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104891479A (en) * | 2015-05-26 | 2015-09-09 | 中国林业科学研究院林产化学工业研究所 | Plant-based graphene and preparation method thereof |
| CN104891479B (en) * | 2015-05-26 | 2017-02-01 | 中国林业科学研究院林产化学工业研究所 | Plant-based graphene and preparation method thereof |
| CN105905990A (en) * | 2016-04-29 | 2016-08-31 | 山西大学 | Water purifying material and preparation method thereof |
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Application publication date: 20110817 |