Test of Adhesion and Cohesion of Silicone Sealants on Facade Cladding Materials within Extreme Weather Conditions

Abstract

This research was carried out as part of project MPO FR - TI4/332 – New Technologies of Bonded Facade Cladding with Anchor Elements with Increased Resistance to Corrosion.This contribution concerns tests carried out to investigate the tensile properties of silicone sealants for use with facade cladding materials. The experimental part of the research is aimed at ascertaining the technical properties of sealants via the cyclic alternation of extension and compression of test specimens in test moulds. For the tests, industrially manufactured neutral and universal silicones were chosen from three different manufacturers. The aim of the research was to discover any differences that might appear in their resistance against alternating maintained extension and compression of the specimens under extreme temperature conditions, i.e. a high temperature of (70+2) °C and a temperature simulating freezing, i.e. (-20+2) °C. The cladding material used was fibre-cement composite boards (known as Cembonit), ceramic and glass cement facade claddings.The result of the measurements taken is a summary in which effective and unsuitable combinations of sealants and test substrates are outlined. The main conclusion is the fact that it is not possible to responsibly choose a suitable material without taking appropriate measurements or having previous experience. A secondary conclusion to this article is the fact that there are significant differences between individual sealants in the results they provide in combination with specific cladding material.

Performance of structural glass facades under extreme loads – Design methods, existing research, current issues and trends

“…In the case of glazing facades and curtains (even not composed of glass panels), careful consideration should be paid for full assemblies but also to single cladding components. Nec ˇasová et al [151], for example, experimentally assessed the adhesion and cohesion properties of silicone sealants in use for curtain walls, giving evidence of the effects of extreme temperatures (À20 °C up to 70 °C the range of interest).…”

Research Summary on Characterizing Impact of Environment on Adhesion of Sealed Joints in Façade Applications

“…On the contrary, polyurethanes were suitable for almost all tested materials. The most negative impact was observed in combination with MS polymer sealant [10][11][12]. One of the conclusions was that this specificity can be partly attributed to the use of a primer in combination with PU sealants that led to an improvement of adhesive properties (the tested silicones and MS polymers did not require the usage of primer).…”

“…The samples were subjected to 11 standardized test methods, e.g., determination of tensile properties at maintained extension after immersion in water acc. to EN ISO 10590:2005 etc., a total of 1980 samples were tested [10]. The group of silicone sealants showed good resistance to weathering.…”

Silicone-Thioxanthone: A Multifunctionalized Visible Light Photoinitiator with an Ability to Modify the Cured Polymers

“…Silicone has been known as an inorganic–organic hybrid polymer material featured with a series of properties such as good chemical and thermal ability, weather-resistance, low friction coefficient, low surface energy, and nonstick behavior [20,21,22,23,24]. It has also been widely used as an additive agent to improve the properties of polymer materials, such as thermal ability [25,26,27] and weather-resistance [28,29]. As a kind of multifunctional photoinitiator, silicone-containing photoinitiator could also endow some specific properties on the photocured materials, such as reducing the critical surface tension of the crosslinked films [30,31].…”