Effect of nano TiO2 on UV aging resistance of wood fiber/polypropylene composites
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摘要: 木塑复合材料作为室外建筑装饰材料时,暴露在紫外光的照射下,易老化导致其力学性能降低、使用寿命减少。将具有高效紫外线屏蔽能力的金红石型纳米TiO2经硅烷偶联剂KH-570表面改性后,与木纤维(WF)、聚丙烯(PP)等制备了TiO2-WF/PP复合材料。对TiO2-WF/PP复合材料进行了人工加速紫外老化,并利用FTIR、TG、SEM、力学性能分析、颜色变化分析等手段,探究了纳米TiO2对WF/PP复合材料抗紫外老化的影响。结果表明:改性纳米TiO2粒子在WF/PP复合材料中均匀分散,无明显团聚,且其加入显著提高了复合材料的热稳定性;TiO2-WF/PP复合材料随着老化时间的延长,力学性能下降相对较小且颜色变化较小。当纳米TiO2的质量分数为2 wt%~3 wt%,老化2 000 h时后,TiO2-WF/PP复合材料的拉伸强度、冲击强度仅分别下降10.0%和12.6%;未加入纳米TiO2颗粒的WF/PP复合材料,则分别下降20.2%和22.6%。Abstract: When wood-plastic composites are used as outdoor building decoration materials, they are exposed to ultraviolet light, resulting in mechanical properties and service life reducing. The rutile nano TiO2 with high-efficiency ultraviolet shielding ability was surface-modified with a silane coupling agent KH-570, and then TiO2-WF/PP composites were prepared with wood fiber (WF), polypropylene (PP). The artificial accelerated UV aging of the composites was carried out. The effects of nano TiO2 on the UV aging of WF/PP composites were investigated by means of FTIR, TG, SEM, mechanical properties analysis and color change analysis. The results show that the modified nano TiO2 particles can be uniformly dispersed in WF/PP composites without obvious agglomeration, and their addition significantly improves the thermal stability of the composites; with the aging time prolonged, the decrease of the mechanical properties of WF/PP composites is relatively small and the color change scope is small. When the mass fraction of nano TiO2 particles is 2 wt%-3 wt% and aging for 2 000 h, the tensile strength and impact strength of the TiO2-WF/PP composites only decrease by 10.0% and 12.6%, respectively, while those without the addition of nano TiO2 particles decrease by 20.2% and 22.6%, respectively.
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Key words:
- nano TiO2 /
- wood fiber(WF) /
- polypropylene(PP) /
- composites /
- surface modification /
- anti-ultraviolet aging
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表 1 TiO2-木质纤维/聚丙烯(TiO2-WF/PP)复合材料的主要成分
Table 1. Ingredients for TiO2-wood fiber/polypropulene(TiO2-WF/PP) composites
Sample Modified TiO2/wt% WF/wt% PP/wt% ZnO/wt% CaCO3/wt% Stabilizer/wt% 0 0 29 66.5 0.5 3 1 1 1 29 65.5 0.5 3 1 2 2 29 64.5 0.5 3 1 3 3 29 63.5 0.5 3 1 4 4 29 62.5 0.5 3 1 5 5 29 61.5 0.5 3 1 -
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