RESEARCH OF BUILDING MATERIALS

Diethyldichloro-, ethyltrichlorosilanes in reactionswith cement stone minerals

Vestnik MGSU 7/2013
  • Novosel’nov Anatoliy Aleksandrovich - Moscow State University of Civil Engineering (MGSU) Candidate of Technical Sciences, Associate Professor, Associate Professor, Department of General Chemistry, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Myasoedov Evgeniy Mikhaylovich - Moscow State University of Mechanical Engineering (MAMI); Moscow State University of Civil Engineering (MGSU) Candidate of Chemical Sciences, Associate Professor, Department of General and Analytical Chemistry, Moscow State University of Mechanical Engineering (MAMI); Professor, Department of General Chemistry, Moscow State University of Civil Engineering (MGSU), Moscow State University of Mechanical Engineering (MAMI); Moscow State University of Civil Engineering (MGSU), 38 Bol’shaya Semenovskaya str., Moscow, 107023, Russian Federation; 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Sidorov Vyacheslav Ivanovich - Moscow State University of Civil Engineering (MGSU) Doctor of Chemical Sciences, Professor, Professor, Department of General Chemistry, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 114-120

One of the uses of organosilicon compounds (OSCs) is associated with the production of hydrophobic coatings for building materials. Water-proofing properties of hydrophobic coatings extend the service life and improve the performance properties of building materials. Some of OSCs form hydrophobic polymer films on the surface of various building materials. High stability of these coatings is associated with the possible existence of chemical bonds between the polyorganosiloxane film and the hydrophilic surface of the material. Presently, there is no clear understanding of the mechanism of interaction between the mineral substrate and the film, although OSCs are widely used as part of water-proof building materials.Towards this end, the authors have identified the conditions that facilitate the formation of protective coatings on the surface of mineral substrates, if OSCs are applied to the surface of building materials. The authors have completed a research into the nature of interaction between the coatings and the mineral substrate to determine their physical and chemical properties. The silylation of calcium hydroxide by diethyldichloro-, ethyltrichlorosilanes was studied as the model process. The products of silylation were studied using methods of gas-liquid chromatography, infrared spectroscopy, electron mi- croscopy, X-ray diffraction and differential thermal analysis.The authors used the method of gas-liquid chromatography to discover that the periods of fast and slow conversion of silanes corresponded to the periods of domination of hydrolysis or hemosorbtion. The authors discovered that the hydrolysis products of diethyldichloro-, ethyltrichlorosilanes do not react with calcium hydroxide.The authors used the method of the thermal analysis to discover the physical and chemical properties of oligomers and polymers formed on the surface of the mineral substrate. Comparison of the findings of the thermal analysis of poliethylpolysiloxane in the mixture and in the block (312 °С) shows that there is practically no shift of the maximum exotherm. The following components of the hydrophobic effect of silylation where identified: formation of insoluble polyorganosiloxanes on the surface and inside the mineral stone accompanied by partial hemosorbtion, and physical adsorption of monomers, oligomers and polyorganosiloxanes - hydrolyzates on the mineral stone surface.

DOI: 10.22227/1997-0935.2013.7.114-120

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