Abstract
Aldehyde-free cotton straw board can be prepared by hot pressing using a starch-based adhesive to realize the value-added reuse of waste, and achieve carbon peak and carbon neutrality. However, traditional starch adhesives have poor stability and weak bonding forces, which leads to poor water resistance and mechanical properties of the resulting board. In this paper, an epoxy/polyvinyl acetal-modified starch adhesive (EP/G-PVA/St) was developed and used to prepare cotton straw board. The starch adhesive and straw fiber formed strong hydrogen bonds and covalent bonds. Due to these bonds, the aldehyde-free cotton stalk board showed an MOE of 3878.55 MPa, an MOR of 32.07 MPa, IB strength of 0.84 MPa, and a TS of 7.40 %. Its comprehensive performance was far greater than that of the ordinary aldehyde-free wood-based board. At the same time, the cost of starch adhesive in this study is significantly lower than PMDI, which has great application value and may find applications in construction engineering materials and modern intelligent agriculture.
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