The use of chloroprene, piperylene and isoprene latexes in the manufacture of paper-like materials

The aim of the study is influence of concentration and nature of synthetic chloroprene, piperylene and isoprene latexes on the physical and mechanical properties of a paper‒like material based on mineral fibers. The methodology of the work was in the manufacture and testing of laboratory samples of asbestos cardboard castings obtained from the composition, wt. h.: 100 ‒ asbestos fiber grade M-4-20; 5‒60 ‒ latexes: chloroprene L-7; piperylene PNK-33/2; isoprene SLIN-40, for sizing asbestos fiber grade M-4-20; 3‒6 was aluminum sulfate as a coagulant. The mechanical and hydrophobic properties of the obtained material are characterized by the physico-mechanical parameters: breaking length (L, m); tear resistance (E, mN); penetration resistance (P_o, kPa); absorbency with unilateral wetting (G, g/m²); capillary absorbency (B, mm); degree of sizing (C, s/mm). Results of the work are: With an increase in the content of PNK-33/2 in the initial mass (5‒40 wt.h.), the breaking length increases. Tearing and punching resistance is: L, m/E, mN/ P_o, kPa = (330‒380)–(550‒626)/(930‒1660)–(2600)/(15‒29)–(35‒40). The strength of castings with SLIN-40 practically does not depend on the binder content (10‒60 wt.h.), varying in intervals at the concentration of coagulant (3‒6 wt.h.): L, m / E, mN / P_o, kPa = (160‒200)–(180‒240)/(1600‒1700)–(1300‒1700)/(15‒17)–(17‒24). The hydrophobic properties of the finished material with PNK-33/2 and SLIN-40 are quite high and increase with the growth in the binder content in the initial mass (10‒40 wt.h.) at a concentration of coagulant (3‒6 wt.h.) in the intervals: G, g/m² / V, mm / S, s/ mm = (2,0–0,3)–(1,8–1,0)/(2,0–0,5)–(1,5–0,3)/(100‒1500)–(150‒1200). Conclusions: a material with high strength and hydrophobic properties can be obtained using latex 30‒40 wt.h. PNK-33/2 and 3‒4 wt.h. Al₂(SO₄)₃. 

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