CARBON FIBER FOR HYDRAULIC COMPOSITE MATERIAL, HYDRAULIC COMPOSITE MATERIAL AND ITS PRODUCTION

• Main Authors: MIYOSHI TOSHIYUKI, KYONO TETSUYUKI, ONO KEIZO, MIZUGUCHI TOYOKAZU
• Format: Patent
• Language: English
• Published: 05.11.1996
• Edition: 6
• Subjects: APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS; ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR; LAUNDERING; LIME, MAGNESIA; METALLURGY; NATURAL OR ARTIFICIAL THREADS OR FIBRES; PERFORMING OPERATIONS; REFRACTORIES; SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS, SLAG, OR MIXTURESCONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER; SLAG; SPINNING; TEXTILES; TRANSPORTING; TREATMENT OF NATURAL STONE; TREATMENT OF TEXTILES OR THE LIKE; TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS,FABRICS, FEATHERS, OR FIBROUS GOODS MADE FROM SUCH MATERIALS; WORKING CEMENT, CLAY, OR STONE

PURPOSE: To improve both the degree of bonding to a hydraulic raw material and the flexural strength of a hydraulic composite material by including a specific amount of an oxygen functional group therein. CONSTITUTION: This carbon fiber for a hydraulic composite material is obtained by carrying out the oxidation treatment using an inorganic or an organic acid (salt) or an alkaline compound (salt) as an electrolyte capable of producing oxygen in an anode by electrolysis and a carbon fiber as the anode, providing the carbon fiber having 0.1-0.4 content of functional groups containing oxygen O/C, as necessary, applying 0.5-5.0wt.% sizing agent consisting essentially of a thermosetting resin to the resultant carbon fiber, cutting the carbon fiber to 1-100mm length, then adding a hydraulic raw material so as to afford 1-5% volume ratio to the hydraulic raw material and, as necessary, an aggregate, an admixture, a thickener, a retarder, etc., thereto, kneading the prepared mixture and extrusion molding the kneaded mixture. The air, steam, natural curings, etc., are then performed to harden the hydraulic raw material. Thereby, the hydraulic composite material reinforced with the carbon fiber is obtained.