Chen Yaoxing, Rao Yongjing, Liu Peng, Han Zhong, Xie Fengwei
School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou Higher Education Mega Center, Guangzhou, Guangdong 510006, China; School of Food Science and Engineering, South China University of Technology, Guangzhou 510641, China.
School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou Higher Education Mega Center, Guangzhou, Guangdong 510006, China.
Int J Biol Macromol. 2024 Dec;282(Pt 4):137180. doi: 10.1016/j.ijbiomac.2024.137180. Epub 2024 Nov 1.
The demand for non-toxic, environmentally friendly, easily processable, water-resistant, flame-retardant and antimicrobial adhesives in the wood processing industry is becoming increasingly urgent. Few adhesives can possess these functions altogether while being synthesized easily. This paper presents a one-pot process utilizing corn starch, sodium hypochlorite, itaconic acid, and borax to synthesize a starch-based adhesive with dual crosslinking. Initial crosslinking takes place between the carboxyl groups of itaconic acid and hydroxyl groups on oxidized starch due to the formation of ester bonds. Secondary crosslinking by borate ester bonds occurs between starch hydroxyl groups and boric acid. The entire reaction process is environmentally benign, generating no waste, with all reactants converted into final products, aligning with "green" chemistry principles. When used to bond wooden boards, this adhesive achieved a dry shear strength of 5.34 ± 0.24 MPa, and a wet shear strength of 1.22 ± 0.06 MPa after soaking in water. Additionally, this starch-based adhesive exhibited antibacterial properties against Escherichia coli (ATCC 8739) and Staphylococcus aureus. Moreover, with borax incorporated, the adhesive demonstrated flame-retardancy. The limiting oxygen index for bonded wooden boards was 30.9 %, qualifying it as a flame-retardant material. These multiple functions render it promising for applications in the wood processing industry.
木材加工行业对无毒、环保、易加工、防水、阻燃和抗菌粘合剂的需求日益迫切。很少有粘合剂能在易于合成的同时具备所有这些功能。本文介绍了一种利用玉米淀粉、次氯酸钠、衣康酸和硼砂一锅法合成具有双重交联的淀粉基粘合剂。由于酯键的形成，衣康酸的羧基与氧化淀粉上的羟基之间发生初次交联。淀粉羟基与硼酸之间通过硼酸酯键发生二次交联。整个反应过程对环境友好，不产生废物，所有反应物都转化为最终产物，符合“绿色”化学原则。当用于粘结木板时，这种粘合剂的干剪切强度为5.34±0.24MPa，在水中浸泡后的湿剪切强度为1.22±0.06MPa。此外，这种淀粉基粘合剂对大肠杆菌（ATCC 8739）和金黄色葡萄球菌具有抗菌性能。此外，加入硼砂后，该粘合剂表现出阻燃性。粘结木板的极限氧指数为30.9%，符合阻燃材料的标准。这些多种功能使其在木材加工行业具有广阔的应用前景。
