目的 确定酚醛树脂（Phenol-formaldehyde Resin,PF）和异氰酸酯（Methylene Diphenyl Diisocyanate,MDI）2种胶黏剂体系下玻璃纤维增强树脂基复合材料（Glass Fiber Reinforced Polymer,GFRP）颗粒增强刨花板适宜的刨花含水率,为退役风电叶片在包装工程用木质基复合板材中的高值化利用提供依据。方法 以废弃风电叶片机械破碎所得GFRP颗粒与杨木刨花为原料,二者质量比为30∶70。分别采用PF和MDI胶黏剂制备GFRP颗粒增强刨花板,其中PF体系和MDI体系的刨花含水率分别为4%~10%和9%~15%;板材厚度为12 mm,目标密度为0.7 g/cm3。按GB/T 17657—2022测定板材静曲强度、弹性模量、内结合强度和24 h吸水厚度膨胀率,分别记为MOR、MOE、IB和TS,并通过SEM和TGA表征板材界面结构与热稳定性。结果 PF体系刨花含水率为4%时综合性能最佳,MOR、MOE、IB和24 h TS分别为30.7 MPa、4 960 MPa、0.89 MPa和13.28%;MDI体系刨花含水率为15%时最佳,对应值分别为26.2 MPa、4 100 MPa、0.84 MPa和14.69%。两体系板材多数指标满足GB/T 4897—2015要求;GFRP的引入提高了板材在800 ℃下的残炭率,且PF体系热稳定性优于MDI体系。结论 PF体系适宜的刨花含水率为4%,MDI体系为15%;所制GFRP颗粒增强刨花板可作为绿色包装工程用复合板材的候选材料,为退役风电叶片资源化利用和包装板材低碳化开发提供工艺参考。
Abstract
The work aims to determine the suitable particle moisture content for glass fiber reinforced polymer (GFRP)-particle-reinforced particleboards prepared with phenol-formaldehyde (PF) and methylene diphenyl diisocyanate (MDI) adhesives, so as to provide a basis for the high-value utilization of decommissioned wind-turbine blades in wood-based composite panels for packaging engineering applications. GFRP particles obtained by mechanical crushing of waste wind-turbine blades and poplar wood shavings were used as raw materials at a mass ratio of 30∶70. GFRP-particle-reinforced particleboards were fabricated with a thickness of 12 mm and a target density of 0.7 g/cm3. The particle moisture content ranged from 4% to 10% for the PF system and from 9% to 15% for the MDI system. The measured properties were modulus of rupture, modulus of elasticity, internal bond strength and 24 h thickness swelling, hereafter denoted as MOR, MOE, IB and TS, respectively. The interfacial structure and thermal stability were characterized by SEM and TGA. Results showed that for the PF system, the best comprehensive performance was achieved at a moisture content of 4%, with MOR, MOE, IB and 24 h TS of 30.7 MPa, 4 960 MPa, 0.89 MPa and 13.28%, respectively. For the MDI system, the best performance was obtained at 15%, with corresponding values of 26.2 MPa, 4 100 MPa, 0.84 MPa and 14.69%. Most performance indicators of the boards from both systems met the requirements of GB/T 4897—2015; the incorporation of GFRP increased the char residue of the boards at 800 °C, and the PF system exhibited better thermal stability than the MDI system. In conclusion, a moisture content of 4% is recommended for the PF system, whereas 15% is recommended for the MDI system. The resulting GFRP-particle-reinforced particleboards can serve as candidate materials for green packaging engineering panels, providing a process reference for the high-value utilization of decommissioned wind-turbine blades and the low-carbon development of packaging panels.
关键词
刨花板 /
玻璃纤维增强树脂基复合材料 /
含水率 /
力学性能 /
热稳定性
Key words
particleboard /
glass fiber reinforced polymer /
moisture content /
mechanical properties /
thermal stability
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基金
大唐环境产业集团股份有限公司（CDTHT20230120467）; 京津冀环境综合治理国家科技重大专项（2025ZD1202900）
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