Polyvinyl alcohol-based synthetic fiber

Provided are polyvinyl alcohol-based synthetic fiber having excellent performances as a fiber for FRC that is prepared by autoclave curing and its very effective production processes. One of the processes comprises having a monoaldehyde or a dialdehyde or its acetalization product penetrate into the...

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Bibliographische Detailangaben
Hauptverfasser:	NISHIYAMA, MASAKAZU, HARADA, YASUHIRO, MIZOBE, AKIO
Format:	Patent
Sprache:	eng
Schlagworte:	FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS LAUNDERING TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION TECHNICAL SUBJECTS COVERED BY FORMER USPC TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TEXTILES 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
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Beschreibung
Zusammenfassung:	Provided are polyvinyl alcohol-based synthetic fiber having excellent performances as a fiber for FRC that is prepared by autoclave curing and its very effective production processes. One of the processes comprises having a monoaldehyde or a dialdehyde or its acetalization product penetrate into the central region of a polyvinyl alcohol-based synthetic fiber at a first stage and then, at a second stage, effecting crosslinking reaction with a mixed solution containing a monoaldehyde and an acid. The other process comprises conducting acetalization with a bath containing 100 to 250 g/l of formaldehyde and 30 to 80 g/l of sulfuric acid at a temperature of 70 DEG to 100 DEG C. The processes can give a polyvinyl alcohol-based synthetic fiber having a strength of at least 11 g/d, a gel elasticity of at least 6.0x10-3 g/cmxd and a dissolution ratio of not more than 40% and being able to withstand an autoclave curing at 140 DEG C. which is necessary for securing the dimensional stability of the resulting cement products.