Thermal Insulation Materials Based on Expanded Vermiculite and Foamed Liquid Glass
- PDF / 396,495 Bytes
- 5 Pages / 594 x 792 pts Page_size
- 38 Downloads / 151 Views
Vol. 61, No. 4, November, 2020
THERMAL INSULATION MATERIALS BASED ON EXPANDED VERMICULITE AND FOAMED LIQUID GLASS I. N. Tikhomirova1,2, A. V. Makarov,1 and Zin Min Htet1 Translated from Novye Ogneupory, No. 8, August, 2020
Original article submitted July 27, 2020. The authors have studied the properties of thermal insulation materials obtained based on expanded vermiculite and liquid-glass binder produced by foaming with a gas-generating (foaming) agent and volumetrically solidified by reacting it with sodium fluorosilicate. The quantitative binder-to-filler ratio was determined, which allows forming the products by casting and obtain materials with various strength, thermal conductivity and density. Keywords: thermal insulation materials, sodium silicate, silicate module, foaming ratio, foaming agent, hardener, expanded vermiculite.
the former type materials occurs at relatively high temperatures (350 – 550°C) due to extraction of chemically bound water from heat-softened glass-like hydrosilicate. The latter type materials are foamed at room or slightly elevated (up to 100°C) temperature due to a chemical reaction between liquid glass and a foaming agent, or as a result of mechanical processing (cellular concrete technology) [2]. Inorganic thermal insulation materials are highly durable and environmentally friendly. At the same time, they have certain disadvantages, such as higher average density compared to organic materials, and increased thermal conductivity, which limits their widespread application for thermal insulation of buildings and structures. However, in terms of fire safety, service life and maintainability, thermal insulation based on mineral components is more effective, although its mechanical strength is lower due to lower average density [4]. The sodium silicate composites are widely used in construction to provide thermal insulation of various building structures and components. The objective of this work is to optimize the composition of the raw-material mixtures, their processing conditions, and to study the thermal insulation properties of the materials made on the basis of expanded vermiculite and liquid-glass binder, mechanically foamed using a foaming agent. According to the sample producing technology, certain dosages of hardener, foaming agent and modifying additives (if necessary) were added to liquid glass. Next, the resulting mass was intensively whipped using a mixer. After the formation of stable foam, vermiculite was gradually added to
INTRODUCTION A review of the experience of different countries in resolving the issue of energy saving shows that one of the most effective ways to address it is to reduce heat losses through the enclosures of buildings, structures, and industrial equipment [1]. An increase in electrical energy and heating media prices necessitates the development of more efficient thermal insulation materials, products and structures made thereof, featuring simplicity, efficiency and competitiveness. The range of highly porous refractory ceramic materials is qui
Data Loading...
