College of Engineering, Qufu Normal University, Rizhao, 276826, China.
College of Engineering, Qufu Normal University, Rizhao, 276826, China.
Carbohydr Polym. 2021 Mar 15;256:117429. doi: 10.1016/j.carbpol.2020.117429. Epub 2020 Nov 24.
An eco-friendly dust suppression and sand-fixation liquid mulching film was prepared via a facile secondary spraying process in this work. Water polyurethane (WPU) was blended with dissolved humic acid (HA) firstly, and then the blend solutions (HWPU) were sprayed on the surface of cationic starch (CS) / sodium lignosulfonate (LS) film to synthesize the liquid mulching film (CLS-HWPU). The effects of liquid mulching film composition on mechanical properties in dry and wet states were investigated. The results showed that the optimal composition of liquid mulching film was: 3% (CS), 0.9 % (LS), 1.5 % (glycerol), 2% (HA), and 30 % (WPU). The CLS-HWPU liquid mulching films were characterized in terms of light transmittance, degradation performance test, contact angle test, scanning electron microscopy (SEM), total reflectance-Fourier transform infrared spectrometer (ATR-FTIR), thermo gravimetric analysis (TGA), and erosion resistance test. The results indicated that the CLS-HWPU film had good UV resistance, thermal stability, anti-erosion, and biodegradation. The CLS-HWPU film meets the demand of dust suppression and sand-fixation in dusty areas and desertification environments, which opens a new application field for liquid mulching film with high safety and environmental protection.
本工作通过简便的二次喷涂工艺制备了一种环保型抑尘固沙液膜。首先将水基聚氨酯（WPU）与溶解的腐殖酸（HA）混合，然后将混合溶液（HWPU）喷涂在阳离子淀粉（CS）/木质素磺酸钠（LS）膜表面，合成液膜（CLS-HWPU）。研究了液膜组成对干湿状态下力学性能的影响。结果表明，液膜的最佳组成是：3%（CS）、0.9%（LS）、1.5%（甘油）、2%（HA）和 30%（WPU）。采用透光率、降解性能试验、接触角试验、扫描电子显微镜（SEM）、全反射傅里叶变换红外光谱（ATR-FTIR）、热重分析（TGA）和耐侵蚀性试验对 CLS-HWPU 液膜进行了表征。结果表明，CLS-HWPU 膜具有良好的耐紫外线性、热稳定性、抗侵蚀性和生物降解性。CLS-HWPU 膜满足多尘地区和沙漠化环境抑尘固沙的要求，为高安全性和环保型液膜开辟了新的应用领域。
