employee
Ekaterinburg, Ekaterinburg, Russian Federation
employee
Ekaterinbuig, Ekaterinburg, Russian Federation
UDK 630 Лесное хозяйство. Лесоводство
The need to create an inexpensive paper-like material based on mineral fibers is due to the protection of thermal insulation of pipelines. Materials used: mineral fibers ‒ asbestos grades M-4-20; binder ‒ vinyl- and vinylidene-chloride latexes VKHVD-65, DVKHB-70; coagulant ‒ aluminum sulfate. Method used: production of samples of asbestos cardboard from a fibrous composition in a TAPPI sheet‒filling machine, wt. h.: 100 asbestos fiber; 5‒60 latex; 3‒10 coagulant. For each composition of the fibrous composition, 10 samples were cast for testing. The properties of the material are characterized by physical‒mechanical parameters: breaking length (L, m); tear resistance (E, mN) and penetration (Po, kPa); absorbency during unilateral wetting (G, g/m2) and capillary (B, mm); degree of sizing (C, c/mm). Results: the strength of castings depends on the nature, binder and coagulant content: for latexes DVKHB-70/ VKHVD-65 ‒ Lmax = (504‒662)/(384‒417) with a significance level of α = 0.05 in the composition, wt.h.: 5‒20 latex; 3‒6 coagulant; Lmin = 206/(132‒168) with α = 0.05 in composition, wt.h.: 25‒60 latex; 7‒10 coagulant; Po(max) = (14‒15)/20 kPa with α = 0.05 at a content of 10/(10‒20) wt.h. latex. Samples with VKHVD-65 are hydrophilic: Gmax / Bmax = (2 ‒3)/(4‒5) with α = 0.05. With an increase in the content of DVKHB-70, the values of G decrease from 1‒3 to zero with α = 0.05; B ≈ 0 for any content of DVKHB-70. The results mean: in theory, the physical and mechanical properties of asbestos cardboard are determined by the film‒forming properties of binders ‒ synthetic latexes; in practice, the compositions of fibrous suspensions for obtaining a protective material with high consumer properties are determined. Conclusion: a key advantage for readers is the practical confirmation of the possibility of creating new composite materials with ingredients of various natures ‒ mineral and organic. The range of latexes with other monomers suitable for the production of asbestos cardboard remains unresolved.
latex, asbestos cardboard, breaking length, tearing resistance, punching resistance, absorbency with unilateral wetting and capillary, degree of sizing
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