CS263349B1

CS263349B1 - Cement fiber elements

Info

Publication number: CS263349B1
Application number: CS876961A
Authority: CS
Inventors: Jan Ing Pinkava; Josef Dr Ing Krusina; Frantisek Ing Vit; Miroslav Ing Bartl; Jaroslav Hancil; Zdenek Ing Suchomel; Hervik Kauer; Vitezslav Ing Zak
Original assignee: Jan Ing Pinkava; Josef Dr Ing Krusina; Vit Frantisek; Miroslav Ing Bartl; Jaroslav Hancil; Suchomel Zdenek; Hervik Kauer; Vitezslav Ing Zak
Priority date: 1987-09-28
Filing date: 1987-09-28
Publication date: 1989-04-14
Also published as: CS696187A1

Abstract

Jako náhrada azbeatocementu jsou určeny výrobky zhotovené odvodněním suspenze obsahující 4 až 8 hmot. ,ó lněných vláken chemicky upravených z textilní výroby upravených průchodem alkaliokou a/nebo kyselou lázní, u nichž obsah necelulozových příměsí je v rozmezí 3 až 12,5 hmot. >ž, z toho do 0,5 až 4 hmot. % ligninu, 1,0 až 3,0 Ijmot. ,'o pektinu, 0,5 až 4 hmot. % hemiceíulozy, 0,4 až 1,0 hmot. % dusíkatých látek a 0,1 až 0,5 hmot. ýá rostlinných gum, a které aále obsahuji 10 až 30 hmot. ·/<, příměsí syntetických vláken, zejména polypropylenových a polyamidových, přičemž z celkového množství vláken je 10 až 70 hmot. a délce do 3 mm a 30 až 90 hmot. :& do 10 mm.As a substitute for asbestos cement, products made by dewatering a suspension containing 4 to 8 wt. % of chemically treated flax fibers from textile production treated by passing through an alkaline and/or acid bath, in which the content of non-cellulosic impurities is in the range of 3 to 12.5 wt. %, of which up to 0.5 to 4 wt. % lignin, 1.0 to 3.0 wt. % pectin, 0.5 to 4 wt. % hemicellulose, 0.4 to 1.0 wt. % nitrogenous substances and 0.1 to 0.5 wt. % vegetable gums, and which also contain 10 to 30 wt. % of synthetic fibers, especially polypropylene and polyamide, of which 10 to 70 wt. % of the total amount of fibers are up to 3 mm long and 30 to 90 wt. % up to 10 mm long.

Description

263 348

FIG. 263 348

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DESCRIPTION OF THE INVENTION

THE REPUBLIC <1S> CERTIFICATE OF CERTIFICATE 263 349 00 (Bij

(60

(23) Show Priority (22) Registered 28 09 87 (21) PV 6961-87.R (51) Int. c6 C 04 B 30/02

OFFICE OFFICE

AND DISCOVERY (40) Published 09 88 (45) Published March 1, 1990 (75) PINKAVA JAN ing., ŠUMPERK, KRUŠINA J0SEP dr. ing., MIDDLE

Author of the invention POŘÍČÍ, VÍT FRANTIŠEK ing., ŠUMPERK, BARTL MIROSLAV ing., BRNO, HANČIL JAROSLAV, SUCHOMEL ZDENĚK ing., ŠUMPERK,

KAUER HERVIK, NOVÝ MALÍN, ŽÁK VÍTĚZSLAV ing., BRNO (54)

Cement fiber elements

As a substitute for azbeat-cement, the products produced by dewatering the slurry containing 4 to 8 wt. 7a fibrous fibers chemically treated from textile fabrics treated by passing alkali and / or acid baths in which the content of non-cellulose admixtures is in the range of 3 to 12.5 wt. % lignin, 1.0-3.0 µmol. 7a pectin, 0.5 to 4 wt.% Hemicellulase, 0.4 to 1.0 wt. % of nitrogenous substances and 0.1 to 0.5 wt. 7 ' vegetable oils, and which still contain 10 to 30 wt. 7a admixtures of synthetic fibers, especially polypropylene and polyamide, wherein from the total amount of fibers is from 10 to 70 wt. 7 and a length of up to 3 mm and 30 to 90 wt. 7o to 10mm. 263349

Claims

The invention relates to cement-fiber elements produced by dewatering a cement-fiber reinforced cementitious binder suspension. Thin-walled building elements, such as slabs, pipes and molded parts, are commonly made of asbestos cement, cement reinforced with natural fibrous material, pulped with asbestos. In addition to the good mechanical and thermal insulation properties, the simple manufacturing technology, resulting in dewatering of the ceraent-and-fiber suspension by subsequent pressing and curing of the resulting material, contributed to the wide spread of these products. Human health harmful effects of asbestos, manifested both in the manufacture and use of asbestos-cement elements, however, by the effort to replace the reinforcing ability of asbestos fiber by other natural or synthetic materials, natural fibers of organic origin are mainly used cellulose, whether in the form of cotton, linen or However, natural cellulose fibers, such as cotton, exhibit a relatively low strength and their smooth oval surface, together with a low surface area, causes poor cement affinity. Low-cementity, which causes the fibers to be removed from the cement and their sedimentation at the bottom of the suspension, is also manifested in mechanically stronger flax fibers. In addition, the presence of noncellulose impurities, up to 30% of the content of polycarbohydrates, lignins, nitrogenous substances, hemicellulose and vegetable gums, retard silicate formation and negatively affect the strength of building materials. Therefore, the fibers must be treated before being added to the suspension. It is known to use raw-filament yarn which has previously been pruned, full-lengthed and shortened to lengths of 4 to 25 mm, then chemically treated by impregnation with lime milk and after drying in a solution of water glass and formaldehyde. However, the fiber still contains woody admixtures and, in addition, formaldehyde, which is healthy. The disadvantage of regenerated cellulose fibers is the