Coating processes – Direct application of electrical – magnetic – wave – or... – Electrostatic charge – field – or force utilized
Patent
1990-04-20
1994-12-06
Nelson, Peter A.
Coating processes
Direct application of electrical, magnetic, wave, or...
Electrostatic charge, field, or force utilized
427185, 427516, B05D 106
Patent
active
053709110
ABSTRACT:
Process for making a tow pre-preg (or tow-preg) comprising long continuous fibers coated with a thermoplastic polymer. A spread tow of long continuous fibers, preferably carbon or glass, is grounded and coated with electrostatically charged particles. The fiber diameter is about 5-50 microns and the mean particle diameter is about 0.1-40 microns. A particle laden air stream is formed by aspirating fluidized polymer particles into a flowing air stream whose velocity exceeds the settling velocity of the particles. The particles in the flowing air stream are continuously electrostatically charged by means of an applied voltage of at least about 20 kV. The flowing air stream with electrostatically charged particles suspended therein is then contacted with the continuously moving grounded spread fiber tow. The particle laden air stream is flowing downwardly and the fiber tow moving horizontally at the time of contact. The fibers with thermoplastic particles clinging thereto are continuously heated to a temperature sufficient to cause fusion of the thermoplastic polymer. This results in long continuous fibers coated with the thermoplastic polymer. The resulting tow-preg, or tow of coated fibers, is useful in the preparation of structural composites in which the fibers service reinforcing fibers. The thermoplastic coating polymer is a high performance polymer, such as thermoplastic polyimide (TPI), where high performance and the structural composite is desired. Polymer coating weights may vary from about 20% to about 90% of the total tow-preg weight.
REFERENCES:
patent: 3873389 (1973-03-01), Daniels
patent: 3919437 (1975-11-01), Brown et al.
patent: 4072795 (1978-02-01), Noonan
patent: 4084019 (1978-04-01), Christ et al.
patent: 4839199 (1989-06-01), de Vager
patent: 5094883 (1992-03-01), Muzzy et al.
Throne, J. L. et al., "Electrostatic Dry Powder Prepregging of Carbon Fiber", 35th International SAMPE Symposium, Apr. 2-5, 1990, pp. 2086-2101.
Sampuran-Singh, et al., Journal of Electrostatics, vol. 4 (1978), pp. 325-334.
Cattanach, J. B., et al., Journal of Polymer Engineering, vol. 6, Nos. 1-4 (1986), pp. 345-362.
Muzzy, J., et al., 34th International SAMPLE Symposium, May 8-11, 1989, pp. 1940-1954.
Varughese, B., et al., "Combining LaRC-TPI Powder with Carbon Fiber by Electrostatic Fluidized Bed Coating." (Jouranl Citation to Come) (1989).
Hartness, T., et al., "Composite Developments from Fully Imidized PMR-15", 34th International SAMPLE Symposium, May 8-11, 1989.
Cross, J., "Electrostatic Powder Coating", Chemistry in Brittain, vol. 17, No. 1 (1981), pp. 24-26.
Kim, C., et al., "Development of Fiber Spreading Technique for Metal Matrix Composites," NRL Memorandum Report 5831, U.S. Naval Research Laboratories, 30 Dec. 1986 (Abstract).
GEMA, Specifications of ES Sprayers types 701, 702 and 705. Product bulletin, 13 sheets (26 pages), published by Ransburg-GEMA AG, St. Gallen, Switzerland, 1982.
Ogden Andrea L.
Throne James L.
Nelson Peter A.
The University of Akron
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