Pressure-Steam Heat Treatment-Enhanced Anti-Mildew Property of Arc-Shaped Bamboo Sheets

Abstract

Bamboo is one of the most promising biomass materials in the world. However, the poor anti-mildew property and poor dimensional stability limits its outdoor applications. Current scholars focus on the modification of bamboo through heat treatment. Arc-shaped bamboo sheets are new bamboo products for special decoration in daily life. In this paper, we reported pressure-steam heat treatment and explored the effect of pressure-steam on the micro-structure, crystallinity index, anti-mildew, chemical composition, physical properties, and mechanical properties of bamboo via X-ray diffractometer (XRD), scanning electron microscopy (SEM), Fourier-transform infrared (FTIR), wet chemistry method and nanoindentation (NI). Herein, saturated-steam heat treatment was applied for modified moso bamboo for enhancing the anti-mildew properties and mechanical properties of moso bamboo. Results showed that with the introduction of saturated steam, the content of hemicellulose and cellulose decreased, while the lignin-relative content increased significantly. The anti-mildew property of moso bamboo was enhanced due to the decomposition of polysaccharide. Last, the modulus of elasticity and hardness of treated moso bamboo cell walls were enhanced after saturated-steam heat treatment. For example, the MOE of the treated moso bamboo cell wall increased from 12.7 GPa to 15.7 GPa. This heat treatment strategy can enhance the anti-mildew property of moso bamboo and can gain more attention from entrepreneurs and scholars.

Dimensionally Stable Delignified Bamboo Matrix Phase-Change Composite under Ambient Temperature for Indoor Thermal Regulation

“…From comparison of Figure 4 b,d, we can see that the cell wall of HTB was looser and more porous than that of original bamboo. Based on this, the HTB was much more easily soaked with chemical reagent, which was also the reason HTB was chosen as the matrix of DB [ 37 , 38 , 39 ]. The cell wall thicknesses of DB and HTB ( Figure 4 d,f) were measured by using image J and the values were 0.56 μm and 2.49 μm, respectively, confirming that the lignin and partial hemicellulose of HTB were removed during the multi-delignification process [ 40 ].…”

Effect of Low-Thermal Treatment on the Particle Size Distribution in Wood Dust after Milling

“…Thermal treatment (thermal modification, hydrothermal treatment) processes are applied to a well-established commercial technology for improving wood’s appearance, dimensional stability, and durability. There are reports about hygrothermal treated hardwood [ 29 , 30 , 31 ], softwood [ 32 , 33 ], and bamboo [ 34 ]. Heat-treated wood, due to its properties, is suitable for flooring, various building facade elements, and especially for humid areas such as saunas and bathrooms.…”

Research on the Change in Chemical Composition and Fungal Resistance of Moso Bamboo with Heat Treatment

“…When exposed to higher temperature conditions, these chemical compositions exhibit viscoelastic and plastic behaviors. Compared with the traditional heat treatment medium, saturated steam, dimethyl silicone oil, tung oil, water, etc., bamboo modified by an oven will not produce a large amount of waste solution, and in the process of treatment can be modified to improve the dimensional stability and mildew resistance [ 5 ]. Additionally, chemical agent impregnation can effectively enhance the mechanical properties and anti-mildew properties of bamboo tubes.…”