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ПРИМЕНЕНИЕ КАРБОКСИЛАТНЫХ ЛАТЕКСОВ ПРИ ИЗГОТОВЛЕНИИ БУМАГОПОДОБНЫХ МАТЕРИАЛОВ
THE USE OF CARBOXYLATE LATEXES INPRODUCTION OF PAPER-LIKE MATERIALS
The aim of the study is to influence the concentration and nature of synthetic carboxylate latexes on the physical and mechanical properties of a paper - like material based on mineral fibers. The methodology of the work consisted in the manufacture and testing of laboratory samples of asbestos cardboard castings obtained from the composition of the composition, wt. h.: 100 - asbestos fiber grade M-4-20; 5-60 - carboxylate latexes SKD-1, BSK-30/2, BSK-70/2, BSK-50/1; for sizing asbestos fiber grade M-4-20; 3-6 - aluminum sulfate as a coagulant. The mechanical and hydrophobic properties of the resulting material characterize the physico-mechanical parameters: breaking length (L, m); tear resistance (E, mN); penetration resistance (Po, kPa); absorbency with unilateral wetting (G, g/m2); capillary absorbency (B, mm); degree of sizing (C, s/mm). Results of the work: the mechanical strength of castings depends on the nature, the content of the binder and coagulant: the breaking length (L, m) decreases in the series BSK-70/2 - SKD-1 - BSK-30/2 - BSK-50/1, namely: 403 - 388 - 371 - 329 at a content of 10?20 mass part latex and 3 mass part Al2(SO4)3 in the initial mass. The maximum value of Po = 33 kPa was found for latex 40 mass part BSK-70/2 and 3 mass part Al2(SO4)3. The hydrophobic properties of the finished material are enhanced by increasing the latex content in the paper mass to 20-40 mass part, reaching a minimum: Gmin = 1-2 g/m2; Bmin = 2-6 mm. Conclusions: a material with hydrophobic properties can be obtained using latex 30-40 mass part SKD-1 and 3-4 mass part Al2(SO4)3.
Keywords: latex, asbestos cardboard, breaking length, tearing resistance, punching resistance, absorbency during unilateral wetting and capillary, degree of sizing.