Classifications

• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
  • D01F9/00—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments
  • D01F9/08—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments of inorganic material
  • D01F9/12—Carbon filaments; Apparatus specially adapted for the manufacture thereof
  • D01F9/14—Carbon filaments; Apparatus specially adapted for the manufacture thereof by decomposition of organic filaments
  • D01F9/20—Carbon filaments; Apparatus specially adapted for the manufacture thereof by decomposition of organic filaments from polyaddition, polycondensation or polymerisation products
  • D01F9/21—Carbon filaments; Apparatus specially adapted for the manufacture thereof by decomposition of organic filaments from polyaddition, polycondensation or polymerisation products from macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
  • D01F9/00—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments
  • D01F9/08—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments of inorganic material
  • D01F9/12—Carbon filaments; Apparatus specially adapted for the manufacture thereof
  • D01F9/14—Carbon filaments; Apparatus specially adapted for the manufacture thereof by decomposition of organic filaments
  • D01F9/145—Carbon filaments; Apparatus specially adapted for the manufacture thereof by decomposition of organic filaments from pitch or distillation residues
  • D01F9/15—Carbon filaments; Apparatus specially adapted for the manufacture thereof by decomposition of organic filaments from pitch or distillation residues from coal pitch
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
  • Y10S264/19—Inorganic fiber

Definitions

• the present invention concerns a process for producing carbon fibres from coal-tar pitch or from other strongly aromatic distillation residues.
• Carbon fibres have already been obtained from coal-tar pitch by subjecting the said pitch to 'a heat treatment at a moderate temperature and possibly to other treatments or conditioning, and thereafter spinning the pitch so treated at a temperature of the order of 300 C.
• the fibres so obtained were subjected to oxidation to render them infusible, and then carbonized in air.
• these processes result in fibres of a much inferior quality, and mechanical properties to those produced from textile (e.g. rayon or poly-acrylonitrile) filaments but the latter are generally expensive to produce.
• iAll object of the present invention is to provide a process which allows an improvement in the quality of the fibres obtained from coal-tar pitch or from another strongly aromatic substance like coal-tar pitch.
• Another object of the present invention is to provide improved fibres obtained from this process.
• a process for the production of carbon fibres from a strongly aromatic distillation residue comprising subjecting the said residue to a heat treatment at a moderate temperature, a hydrocarbon polymer being added to the said residue, before or during the heat treatment, the
• polystyrene polystyrene
• polybicyclo[2,2,1]-heptene-2 rubbers, etc.
• the filtered strongly aromatic pitch is heated, before spinning under conditions of temperature, and for 'a length of time, as well as with agitation, such that the obtained material contains no or only a little anisotropic material; in other words, the heat treatment is stopped at the latest at the beginning of the onset of the anisotropic phase.
• the presence of anisotripic material can easily be evidenced by examination with a polarized light optical microscope (M. Ihnatowicz, P. Chiche, J. Deduit; S. Pregermain and R. Tournant, Carbon, 4, 41 (1966)).
• This heat treatment can be achieved in a reactor provided with an agitation or stirring system and means for scavenging gases.
• the scope of this invention includes carbon fibres made by the process as set forth above.
• This pitch was previously filtered 'at C. over a bronze filter with mean pore size of 2,1 in order to separate out the solid and pseudo-solid particles that the pitch contains naturally.
• melt-index 4 high densiy polyethylene
• the resulting product was spun at 204 C. at a drawing speed of 450 m./minnte.
• the thus prepared carbon fibres were measured to have a mean breaking strength of 60 kg./mm. and a Youngs modulus of 4600 l g./mm. for a diameter of 30
• the total yield of the operations as described in Example 1 was 64% EXAMPLE 4 (NOT ACCORDING TO THIS lNVENTION)
• the operating conditions were identical with those in Example 1, but here the pitch did not receive any additive.
• the carbon fibres prepared in this way were measured to have 'a mean breaking strength of 24 kg./mm. and a Youngs modulus of 3300 kg./mm. for a diameter of 30 1.
• Example 1 The total yield of the operations as described in Example 1 was 61% The advantages of the invention are thus apparent by comparing these properties with those of the fibres according to the invention described in Examples 1 to 3.
• a process for the production of carbon fibres from a strongly aromatic distillation residue pitch comprising subjecting said pitch to a heat treatment at a temperature on the order of about 420 C., the product of the heat treatment being thereafter spun into fibres which are then oxidized and carbonized, the improvement comprising adding a hydrocarbon polymer in an amount suflicient to improve the mechanical properties of the carbonized fibres to said pitch no later than during said heat treatment, said hydrocarbon polymer being selected from the group consisting of polyethylene, polypropylene, polystyrene, polybicycle[2,2,l]-heptene-2 and rubber.

Landscapes

• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Inorganic Fibers (AREA)
• Artificial Filaments (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=9055708

Family Applications (1)

Country Status (11)

Cited By (11)

Families Citing this family (1)

• 1970
  • 1970-05-19 FR FR7018171A patent/FR2087413A5/fr not_active Expired
• 1971
  • 1971-04-27 US US00137976A patent/US3784679A/en not_active Expired - Lifetime
  • 1971-05-06 NL NL7106217A patent/NL7106217A/xx unknown
  • 1971-05-11 BE BE766992A patent/BE766992A/xx unknown
  • 1971-05-12 IT IT24427/71A patent/IT939003B/it active
  • 1971-05-13 LU LU63163D patent/LU63163A1/xx unknown
  • 1971-05-17 JP JP46033188A patent/JPS5040170B1/ja active Pending
  • 1971-05-17 GB GB1519371*[A patent/GB1340099A/en not_active Expired
  • 1971-05-18 CH CH733971A patent/CH526467A/fr not_active IP Right Cessation
  • 1971-05-18 CA CA113,320*7A patent/CA958176A/en not_active Expired
  • 1971-05-18 DE DE2124636A patent/DE2124636C3/de not_active Expired

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