Zhenzeng Wu,John Tosin Aladejana,Shuqiong Liu,Xinhuai Gong,Xiaodong Alice Wang,Yongqun Xie
Unsaturated polyester resin (UPR) with good chemical resistance, excellent mechanical properties, and formaldehyde-free shows great potentials in the wood industry. In this study, the mechanical strength, thermostability, dynamic thermomechanical property, and interfacial bonding of bamboo particle boards (BPBs) made from UPR adhesives with toluene diisocyanate (TDI) as the coupling agent were explored. The results showed that covalent bonds were formed among TDI, bamboo particles, and UPR, which could significantly enhance the mechanical strength. The internal bonding strength, modulus of elasticity, and modulus of rupture of treated BPBs were 1.36, 3010, and 19.6 MPa with the increment of 1250, 514, and 833%, respectively, compared to the control samples. Also, the thickness swelling rate of the BPB was 4.6%, much lower than that of the control, with a decrease of 92%. The thermostability of the treated BPB was also improved. As a result, the BPB using UPR as the adhesive and TDI as the coupling agent shows better usability, higher efficiency, and excellent mechanical strength.
Liyuan Zhang,Yizhen Chen,Shimin Geng,Zhen Huang,Renhui Qiu,Tingting Chen,Wendi Liu
The development of eco-friendly adhesives derived from renewable sources to replace conventional petroleum-based alternatives could promote the achievement of carbon peaking and carbon neutrality goals. Herein, a series of plant oil thermosets were developed from acrylated epoxidized soybean oil (AESO) and a palm oil-based dimethacrylate (MPOEA), and then used as the adhesives for developing formaldehyde-free bamboo particleboards . Concerning the weak cohesion and adhesion forces of the adhesives, 2-isocyanethyl methacrylate (IEM) was incorporated to enhance both the crosslinking density within the thermosets and the bonding strength between bamboo particles and the thermosetting materials. The addition of IEM resulted in a notable improvement in the processability, mechanical characteristics, thermal resistance, and lap-shear strength of the thermosets. The thermosets with optimum components attained a tensile strength of 29.7 MPa, a glass transition temperature of 106.9 °C, and a shear strength of 1.7 MPa onto bamboo. The prepared bamboo particleboards exhibited superior mechanical properties, water resistance, and high-temperature resistance.
危险品化学品经营许可证（带存储）