Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...
Patent
1988-05-06
1989-07-18
Lieberman, Paul
Compositions: coating or plastic
Materials or ingredients
Pigment, filler, or aggregate compositions, e.g., stone,...
106502, 106477, 44 51, 44591, 44599, 264293, 23314, C09C 144, C10L 132
Patent
active
048490210
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
(1) Field of the Invention
The present invention relates to a novel process for producing coal fillers. More particularly, the present invention relates to an economical process for producing coal fillers that excel in reinforcing rubbers and plastics and can be suitably used in rubber industries, tire industries, plastic industries, etc.
BACKGROUND ART
Carbon blacks has been widely used as reinforcing agents for tires or rubbers, black pigment for printing inks or paints, coloring materials for resins, materials for dry batteries, conductive materials, etc. in various fields. Especially, those for reinforcing tires or rubbers preponderate in demands, and carbon blacks of various qualities are used as materials for the reinforcing agents.
Carbon blacks are usually produced by incomplete combustion or thermal decomposition of hydrocarbonaceous gases or oils originated from petroleum or coal, such as natural gas, petroleum gas, crude naphthalene, creosote oil, pitch oil, or the like. Known processes for the above-mentioned production are furnace method for producing furnace blacks, channel process for producing channel blacks, thermal process for producing thermal blacks, and the like.
However, these methods in which hydrocarbonaceous gases or hydrocarbonaceous oils are used as raw material have defects that the raw material situations are unstable and high cost is inevitable owing to the complicated producing processes.
On the other hand, in order to solve the defects, there was proposed a method of producing coal carbon blacks for rubber-reinforcing agents wherein a solid coal itself is thermally decomposed instead of creosote oil or crude naphthalene obtained by carbonization of coal (Japanese Patent Publication No. 16,107/1963). However, the carbon blacks for coal filler obtained by the method have a disadvantage in their use as a reinforcing agent for rubbers since they have a large ash content which decreases the modulus of rubbers and elongates vulcanization of rubbers.
The object of the present invention is to provide an economical process for producing coal fillers having excellent rubber-reinforcing properties.
DISCLOSURE OF INVENTION
As the result of our researches to attain the object, we found that the object can be easily attained by a novel method of producing coal fillers wherein a slurry of ultrafinely pulverized product obtained by subjecting a coal to specified treatment is treated by means of a specified deliming/agglomeration treatment, i.e. a specified oil-agglomeration technique suitable for agglomeration of ultrafine-particles, and we eventually came to complete the present invention.
According to the present invention, there is provided a process for producing coal fillers which comprises the steps of: having a particle size of not more than 10 mm and an ash content of not more than 10% by weight by thermal decomposition at a temperature of 500.degree. to 2,000.degree. C.; and cooling the carbonized solids; carbonized solids having a solids content of 10 to 50% by weight by adding a dispersion medium to the carbonized solids; and ultrafinely pulverizing the carbonized solids dispersed in the slurry to reduce the average particle size to not more than 5.mu.; slurry to 1 to 20% by weight by further adding water to the slurry of the ultrafinely pulverized solids; adding an oil having a boiling point of not more than 150.degree. C. to the resulting slurry in a ratio of 30 to 300 parts by weight of the oil per 100 parts by weight to dry solids; agitating the resulting mixture to agglomerate the carbonaceous matter with oil; and separating and recovering the agglomerates; and heating them at 50.degree. to 300.degree. C. to evaporate the water and oil retained in the agglomerates; and cooling the dried agglomerates.
The coals which may be used in the step (a) to be carbonized by thermal decomposition have an ash content of not more than 10% by weight, preferably not more than 7% by weight, more preferably 3% by weight. The illustrative examples of coals to be used as
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Nakai Masayuki
Tomura Katsumi
Uesugi Kenji
Idemitsu Kosan Co. Ltd.
Kirschner Helene
Lieberman Paul
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