Regenerated natural polymer-based solid-solid phase change fiber as well as preparation method and application thereof

The invention belongs to the technical field of modified asphalt, and particularly relates to regenerated natural polymer-based solid-solid phase change fibers and a preparation method and application thereof. Natural polymer materials are used as raw materials, and the natural polymer-based solid-solid phase change materials are prepared through chemical grafting of the natural polymer materials and phase change materials; and the regenerated natural polymer-based solid-solid phase change fiber is obtained by using a solution spinning method. The phase change material has latent heat characteristics and can store heat and adjust temperature. The phase-change fiber is doped into the asphalt, and when the environment temperature rises to the phase-change temperature, the phase-change fiber absorbs and stores a large amount of heat, so that the high-temperature stability and durability of the asphalt and the asphalt mixture are improved, the pavement performance is improved, and meanwhile, the high-temperature