Influence of relative humidity on the hardening behavior of wallpaper paste

Commercially available wallpaper paste mainly consists of methyl-cellulose. Due to its hydrophilic character this cellulose ether can be dispersed in cold water forming a gel. The drying of the gel results in the hardening of the adhesive material. When the wallpaper paste is used for paperhanging, the hardening process indicates that the wallpaper is fixed on the wall. This process depends on the water content of the paste which in turn is affected by the ambient relative humidity. For this reason the impact of relative humidity on the rheological behavior of wallpaper paste has been investigated. Application oriented measurements were conducted using an Anton Paar Modular Compact Rheometer, a modified Convection Temperature Device and a Modular Humidity Generator.

Commercially available wallpaper paste mainly consists of methyl-cellulose. Due to its hydrophilic character this cellulose ether can be dispersed in cold water forming a gel. The drying of the gel results in the hardening of the adhesive material. When the wallpaper paste is used for paperhanging, the hardening process indicates that the wallpaper is fixed on the wall. This process depends on the water content of the paste which in turn is affected by the ambient relative humidity. For this reason the impact of relative humidity on the rheological behavior of wallpaper paste has been investigated. Therefore, a commercially available wallpaper paste was mixed with water (c = 2.5 g / 100 g). Application oriented measurements were conducted using an Anton Paar Modular Compact Rheometer (MCR), a modified Convection Temperature Device (CTD 180 Humidity Ready) and a Modular Humidity Generator (MHG). As measuring system a plate-plate geometry PP50 (Ø=50 mm) or a modified ring geometry PPR32/28 (Øout = 32 mm; Øin = 28 mm) was used. The temperature was 25 °C for all tests. 

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