Nano cellulose solid-solid phase transition material and its preparing method

Abstract

The invention relates to a kind of nano cellulose solid - solid phrase change material and its producing method. Its characteristics are: in non-homogeneous phase system, according to the reactants proportions as polyethylene glycol containing active group at one end or both ends 19.8% - 82.0%, crosslinking agent 0% - 55.1% and nanometer cellulose or its ramification 4.0% - 69.5%, ingraft the polyethylene glycol containing active group at one end or both ends as energy storing function group onto nanometer cellulose or its ramification framework material. The biggest enthalpy of phase change of the nanometer cellulose solid - solid phrase change material of the invention can get to over 110 J / g, the phrase change temperature is 0 - 60 Deg. C, and can keep good solid state before and after the phrase change. It won't occur phrase separation, besides it is non-toxic and harmless, low cost, simple producing technics.

Description

technical field [0001] The invention relates to a phase change material, in particular to a nano-cellulose solid-solid phase change material, and also to a preparation method of the phase change material. Background technique [0002] Phase change materials are currently widely used energy storage materials, and with the coming of the energy crisis, their applications in real life will be more extensive. According to the different phase change methods, phase change materials can be divided into solid-liquid phase change materials and solid-solid phase change materials. At present, the most commonly used phase change materials at home and abroad are solid-liquid phase change materials, but because of the liquid phase generated during the phase change process, it must be packaged in a container before use, otherwise the liquid phase will leak and corrode and pollute the environment. Danger. Moreover, the liquid material of solid-liquid phase change materials generally has di...

AI Technical Summary

Problems solved by technology

From a macroscopic point of view, crosslinking occurs between the energy storage groups and the skeleton material, but from a microscopic point of view, this phase change material is homopolymerized to a large extent, that is, a very large part of the skeleton material and the skeleton material Material cross-linking, energy storage groups and energy storage groups are cross-linked, which may cause phase separation, liquid phase leakage and other phenomena during the use of phase change, so the preparation process of the phase change material becomes more complicated

In U.S. patents [US 863 274 (1992)] and [US371 779 (1989)], the phase change materials are prepared by chemical methods, not only the phase change enthalpy of the phase change materials is small, but also the stability of the materials is not good