| Ramie composites were prepared by the compression molding process using the high density polyethylene and the ramie fiber as raw materials. The effects of fiber content, coupling agent treatment, grafted modification ramie fibers and antioxidants on the anti-thermo-oxidative aging of composite were studied by testing the mechanical, melt index, thermal properties and other properties before and after aging. The results showed that:1. Proper amount of ramie fiber composite materials can improve the mechanical properties of the composites during thermo-oxidative aging test. It can be found that the higher the fiber content, the more obvious the color changing in the aging process. The melt index of the composites is reduced along with the increasing in fiber content, the surface tension and the melting temperature of the composites were less than those of pure HDPE after aging process.2. Treating the fiber with coupling agent had improved the mechanical properties before and after the aging, bated the color changes of composites during aging process, reduced the melt index and improved the aging melt temperature and the surface tension.3. Grafted modification had improved the mechanical properties before and after the aging, bated the color changes of composites in aging process,increased melt index and melt temperature.4. Three kinds of antioxidants, BHT, 1010A and 1076 were selected in this paper, 1010A did best improving the flexural strength of composites, the antioxidant 1076 did best improving the impact strength of composites, and the melt index and melt temperature of the composites can be increased after adding of the three kinds of antioxidants.5. The proper combination of the antioxidant can improve properties of the composite during aging process.
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