On the Mechanism of Destruction and Oxidation of Starch for the Production of Plasterboard Sheets (PBS)

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The technological process of PBS production requires careful control of the phase composition of the gypsum binder used, as well as compliance with the drying modes of the sheets. This is necessary in order to ensure the adhesion of the gypsum core to the cardboard and, as a result, to give the sheets the required mechanical and physical properties. The use of various kinds of modified starches in the production technology of PBS makes it possible to achieve the required adhesion with fluctuations in the phase composition of the binder and deviations in the drying mode of products. Considering this, it becomes obvious that the characteristics of modified starches have a significant effect on the quality of PBS. The study of existing standards regulating the quality indicators of starch derivatives showed the absence of parameters reflecting the effectiveness of their use in the production technology of PBS. In this paper, the structural features of the most widely used types of modified starch are considered. The paper summarizes information about the mechanism of adhesion of the gypsum core to cardboard, the factors influencing this process, the mechanisms of starch destruction and oxidation, and also offers a list of quality indicators of starch derivatives and the requirements for them. It is shown that the effectiveness of the use of modified starches in the production of PBS is achieved by regulating the direction and depth of the processes of destruction and oxidation.

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作者简介

S. Araslankin

«Exponenta» LLC

编辑信件的主要联系方式.
Email: ceo@sci-exp.ru

CEO

俄罗斯联邦, 26 A, Stanislavskogo Street, Ruzayevka, 431448

M. Shchankin

«Exponenta» LLC

Email: lab@sci-exp.ru

Candidate of Science (Biology), Senior Scientist

俄罗斯联邦, 26 A, Stanislavskogo Street, Ruzayevka, 431448

A. Buryanov

National Research Moscow State University of Civil Engineering

Email: rga-service@mail.ru

Doctor of Sciences (Engineering)

俄罗斯联邦, 26, Yaroslavskoe Highway, Moscow, 129337

O. Nipruk

Lobachevsky State University of Nizhny Novgorod (National Research University)

Email: nipruk@chem.unn.ru

Doctor of Sciences (Chemistry)

俄罗斯联邦, 23, Gagarina Avenue, Nizhny Novgorod, 603022

参考

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2. Fig. 1. The diagram for adhesion of a gypsum to cardboard depending on the concentration of CaSO₄.2H₂O (1) and CaSO₄.1/2H₂O (2)

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3. Fig. 2. The diagram for adhesion of a gypsum to cardboard depending on the moisture content in the cardboard and gypsum

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4. Fig. 3. Structural fragments of amylose and amylopectin

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5. Fig. 4. Degradation mechanism of starch: I – homolytic cleavage of the glycosidic bond; II – heterolytic cleavage of the glycosidic bond

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6. Fig.5.

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