摘要:
A process for preparing fibers from an optically anisotropic solution containing either one of cellulose or cellulose derivatives by extruding the solution through a non-corroding spinneret and coagulating the resulting extrudates in a coagulant, the coagulant being a liquid which contains mostly water and to which cations have been added.
摘要:
Cellulose fibres and filaments are prepared from a spinnable, cellulose-containing solution containing 94-100 wt. % cellulose, water, and phosphoric acid and/or anhydrides of phosphoric acid. The resulting cellulose fibres and filaments have an elongation break point greater than 7%. The cellulose-containing solution used to prepare the fibres and filaments may be either isotropic or anisotropic. The cellulose-containing solution is coagulated in a liquid containing water and cations, and the cations are preferably monovalent. Fibres and filaments prepared in this manner are especially suitable for use in textiles.
摘要:
A process for preparing a material having a high water and salt solutions absorbency, the material containing mainly cellulose that is dissolved in a solvent containing phosphoric acid, a solution is obtained that contains 94-100 wt. % of the following constituents:cellulose,phosphoric acid and/or its anhydrides, andwater,the solution is then coagulated and washed in a liquid containing less than 50 wt. % of water. This process can be used to obtain cellulose products, such as fibers or pulp, which have a high water and (isotonic) salt solutions absorbency.
摘要:
A spinnable, isotropic solution containing cellulose, phosphoric acid and/or anhydrides of phosphoric acid and water is prepared by dissolving cellulose in a solvent, the solvent being a homogeneous mixture of water and at least one of phosphoric acid and anhydrides of phosphoric acid such that the solvent contains 72-85 wt. % of phosphorous pentoxide, P.sub.2 O.sub.5. The cellulose is mixed with the solvent in a mixing apparatus, the mixing apparatus having mixers, kneaders or the like, and capable of generating high shearing forces. The solution is converted from anisotropic phase to isotropic phase by the addition of water. The water required to convert the solution to the isotropic phase is added either just prior to, during or after the mixing step. The solvent preferably contains 72-80 wt. % P.sub.2 O.sub.5 and 7-20 wt. % of cellulose, and is used to make hollow fibers, membranes, non-woven films, and other articles requiring the use of cellulose-containing solutions.
摘要:
The invention is directed to a cellulose filament yarn having a breaking tenacity of higher than 600 mN/tex and containing more than 400 filaments and a cord made therefrom.
摘要:
Fibers made from a blend of poly-p-phenylene terephthalamide (PPDT) and a copolyamide derived from p-phenylene diamine, terephthalic acid and a naphthalenic difunctional monomer show improved properties, particularly tenacity, compared with PPDT fibers. The blend can be processed in the same manner as the PPDT polymer.
摘要:
Fibres consisting wholly or substantially of a mixture of poly-p-phenylene terephthalamide and an aromatic copolyamide. They display an improved tensile strength and elongation at break if the mixture contains, as the copolyamide, (2-25% b.w. of) a polycondensation product of terephthalic acid, p-phenylene diamine and a monomer selected from the group consisting of piperazine, benzidine and 1,4-diamino anthraquinone. The fibres are particularly suitable for use in the manufacture of tire yarn.
摘要:
Fibers substantially consisting of a blend of aromatic polyamides comprising poly-p-phenylene terephthalamide and up to 50 wt. % of a second polyamide of related structure containing diaminobenzanilide units.The second polyamide should provide at least 0,1 wt. % of diaminobenzanilide units in the blend and is derived from aromatic monomers selected from the group comprising terephthalic acid, 4,4'-diamino benzanilide, p-phenylene diamine and p-amino benzoic acid. The fibers possess an elastic behavior particularly useful for tire yarn purposes.
摘要:
Fibers are air-gap spun from a polymeric spinning mass comprising an aromatic polyamide (such as poly-p-phenyleneterephthalamide) by extrusion through a spinneret, passing through an air-gap, passage through a liquid (such as water), and exiting the liquid via an aperture which is variable in size. The use of such an aperture allows easier use of the equipment (especially the stringing up operation) and better fibre properties (such as tensile strength).