Insulation boards from annual and perennial plants with tannin and other adhesives
: 33 - 39
The thermal insulation of buildings does not only saves energy costs, but also helps to reduce CO2 pollution and save resources. This study deals with the production of insulating boards based on biogenic raw materials and the investigation of their material properties. Maize stack and wheat straw as well as miscanthus were used as the raw material for the boards. The binder used was a urea-formaldehyde resin, a sodium water glass and a tannin-hexamine system. The boards were produced by means of a hot pressing process under comparable conditions. In addition to the thermal conductivity of the boards, the particle distribution, the water uptake or release as well as the fire behaviour of the different starting materials as well as of the resulting their panels/plates were examined. The results show that the thermal conductivity of the panels from the raw materials used is in the range of natural insulation materials on the market. The results from the water uptake test show low increase of the miscanthus boards. The influence of the different adhesive systems plays only a subordinate role in the water uptake/absorption. However, differences in adhesives can be determined by the fire behaviour test. Here, the tannin-hexamine binder shows advantages over the two other systems. Through these investigations, the potentials of plant based natural materials as an insulating material and as a binder were raised to provide a basis for further investigations.