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Carbon material precursor and method for producing carbon material using the same

a carbon material and precursor technology, applied in the direction of carbon preparation/purification, etc., can solve the problem of low carbonization yield of carbon material precursor prepared using polyacrylamide, and achieve high carbonization yield, high carbonization yield, and enhanced carbonization yield of carbon material precursor

Active Publication Date: 2019-08-20
TOYOTA CENT RES & DEV LAB INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]The present inventors have made earnest studies to achieve the object described above and as a result found that the carbonization yield of a carbon material precursor containing an acrylamide-based polymer is improved by adding to the acrylamide-based polymer at least one addition component selected from the group consisting of acids and salts thereof, which led to the completion of the present invention.
[0011]Note that it is not necessarily certain why the carbon material precursor of the present invention has a high carbonization yield. The present inventors have surmised as follows. Specifically, it is presumed that by heating (in particular, thermally-stabilizing) the carbon material precursor of the present invention, an acid or a salt thereof which is the addition component functions as a catalyst for the dehydration reaction of the acrylamide-based polymer and the structure of the acrylamide-based polymer transforms to a highly heat-resistant structure, enhancing the carbonization yield of the carbon material precursor.
[0012]The present invention makes it possible to obtain a carbon material precursor which contains an acrylamide-based polymer and has a high carbonization yield. In addition, use of such a carbon material precursor of the present invention makes it possible to safely produce a carbon material at a low cost.

Problems solved by technology

However, there has been a problem that a carbon material precursor prepared using polyacrylamide has a low carbonization yield because the mass of such carbon material precursor decreases to only about 20% when heated to 500° C.

Method used

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  • Carbon material precursor and method for producing carbon material using the same

Examples

Experimental program
Comparison scheme
Effect test

synthetic example 1

[0032]Dissolved into 190 ml of water was 8.52 g (120 mmol) of acrylamide (manufactured by Wako Pure Chemical Industries, Ltd. and for electrophoresis). After that, 366 mg (1.20 mmol) of 4,4′-azobis(4-cyanovaleric acid) was added as a polymerization initiator, followed by radical polymerization for 3 hours at 70° C. The obtained aqueous solution was introduced into methanol, followed by precipitation of polyacrylamide. Polyacrylamide was collected and subjected to vacuum drying.

example 1

[0033]Polyacrylamide obtained in Synthetic Example 1 was dissolved into water so as to be a concentration of 10% by mass. Phosphoric acid was added to the obtained polyacrylamide aqueous solution so that the content of phosphoric acid was 2% by mass relative to 100% by mass of carbon material precursor. Freeze drying was performed using the obtained phosphoric acid-containing polyacrylamide aqueous solution. As a result, a carbon material precursor containing polyacrylamide and phosphoric acid was obtained.

example 2

[0034]A carbon material precursor was obtained in the same manner as that in Example 1 except that diammonium hydrogen phosphate was used instead of the phosphoric acid. Note that the content of diammonium hydrogen phosphate was 2% by mass relative to 100% by mass of carbon material precursor.

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Abstract

A carbon material precursor comprises an acrylamide-based polymer and at least one addition component selected from the group consisting of acids and salts thereof; and a method for producing a carbon material comprises thermally-stabilizing the carbon material precursor and then carbonizing the carbon material precursor.

Description

BACKGROUND OF THE INVENTION[0001]Field of the Invention[0002]The present invention relates to a carbon material precursor and a method for producing a carbon material using the same.[0003]Related Background Art[0004]Heretofore, as a method for producing carbon fibers, which are a type of carbon material, a method including: thermally-stabilizing a carbon fiber precursor obtained by spinning polyacrylonitrile; and then carbonizing the carbon fiber precursor has been mainly employed (for example, Japanese Examined Patent Application Publication No. Sho 37-4405 (Patent Literature 1), and Japanese Unexamined Patent Application Publication Nos. 2015-74844 (Patent Literature 2), 2016-40419 (Patent Literature 3), and 2016-113726 (Patent Literature 4)). There has been a problem that the producing cost of carbon fibers is high because polyacrylonitrile used in this method is poorly soluble in inexpensive general-purpose solvents and hence it is necessary to use expensive solvents such as dim...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C08K3/26C08K3/28C08K3/30C08K3/32C08K3/38C01B32/05C08K5/092C08F120/56
CPCC08K3/38C01B32/05C08F120/56C08K3/26C08K3/28C08K3/30C08K5/092C08K3/32C08K2003/329C08K2003/262C08K2003/3045C08K2003/3054C08K2003/322C08K2003/324C08K2003/321C08K3/24C08K5/09
Inventor HAYASHIDA, KENICHIMORISHITA, TAKUYA
Owner TOYOTA CENT RES & DEV LAB INC
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