纳米白炭黑核-壳型木塑复合材料抗紫外老化研究

发布时间：2018-03-16 10:43

本文选题：核-壳木塑复合材料　切入点：纳米白炭黑　出处：《塑料工业》2017年04期 　论文类型：期刊论文

【摘要】：以高密度聚乙烯(HDPE)和木粉为原料,辅以少量化学助剂,采用共挤出生产工艺,以芯层木塑比为6∶4,壳层添加不同含量纳米白炭黑制备出核-壳结构木塑复合材料(WPC)。将其放入老化箱进行紫外光加速老化试验,并对表面颜色、表面形貌、抗弯性能及化学成分进行了测试和表征。结果表明,紫外老化2 500 h后,较之空白样,加入2%纳米白炭黑的ΔE下降了32.7%,试样表面更加完整,裂纹与粉尘较少;弯曲强度保留率提高了9.9%,弹性模量保留率提高了13.2%,且均优于1%纳米白炭黑试样;所有材料表面的氧(O)/碳(C)含量比(n_O/n_C)与老化后木塑表面氧化的碳(C_(ox))/未氧化的碳(C_(unox))的含量比(n_(C_(ox))/n_(C_(unox)))均增大,表面氧化程度加深;其中添加2%纳米白炭黑的WPC表面氧化程度最低,n_O/n_C增长幅度为15.5%,n_(C_(ox))/n_(C_(unox))增加了16.5%,均低于空白样与1%纳米白炭黑试样。说明纳米白炭黑能够提高核-壳WPC抗紫外老化性能并降低其光氧化降解程度,并且适当提高添加量效果更佳。
[Abstract]:High density polyethylene (HDPE) and wood flour were used as raw materials and a small amount of chemical auxiliaries were used to produce HDPE and wood flour by co-extrusion. Core-shell structure wood-plastic composite (WPC) was prepared with core layer wood / plastic ratio of 6: 4 and shell layer with different content of nano-silica. It was put into aging box for UV accelerated aging test, and the surface color and surface morphology were analyzed. The bending resistance and chemical composition were tested and characterized. The results showed that after UV aging for 2 500 h, the 螖 E of 2% nanometer silica decreased by 32.7%, the surface of the sample was more complete, and the cracks and dust were less than that of the blank sample. The retention ratio of flexural strength and modulus of elasticity were increased by 9.9 and 13.2mm, respectively, and were better than those of 1% nano-silica. The content of O / C) on the surface of all the materials is higher than that on the surface of all materials, and the content of the oxidized C / C / C / C / C / C / C / C / C / C / C / C / C are higher and the degree of oxidation on the surface is higher than that on the surface of the aged wood / plastic surface. The surface oxidation degree of WPC added with 2% nm silica was the lowest, and the increase rate of WPC was 15.5nC. The increase was 16.5g, which was lower than that of blank sample and 1% nano-silica sample. The results showed that nano-silica could improve the anti-UV aging performance of core-shell WPC and improve the UV aging resistance of WPC. Reduce the degree of photooxidation degradation, And it is better to increase the amount of addition properly.
【作者单位】：南京林业大学材料科学与工程学院;江苏省速生木材与农作物秸秆材料工程研究中心;江苏省林业资源高效利用协同创新中心;
【基金】：国家948项目(2014-4-49) 江苏省优势学科二期建设项目(PAPD) 江苏省林业资源高效利用协同创新中心项目
【分类号】：TB332

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