Flame-retardant phase-change material containing Schiff base structure as well as preparation method and application thereof

Abstract

The structural general formulas of a flame-retardant phase-change material containing a Schiff base structure disclosed by the invention are shown in the specification, the phase-change temperature ofthe flame-retardant phase-change material is 33-101 DEG C, the phase-change enthalpy of the flame-retardant phase-change material is as high as 117.9-183.4 J / g, and the carbon residue rate of the flame-retardant phase-change material is 3.4-23.8%. The initial decomposition temperatures of the flame-retardant phase-change materials represented by the structural general formulas [I] and [II] can beincreased by 19.3-42.7% and 34.9-38.8% respectively. The invention also discloses a preparation method and application of the material. The phase-change material disclosed by the invention contains aC = N group with a high-temperature cross-linking charring effect, so that a generated carbon layer is good in heat-insulating and oxygen-isolating effects, the thermal weight loss behavior of the material can be changed, the phase-change material has relatively high phase-change energy storage property, the phase-change material can be endowed with excellent flame retardance without adding a flame retardant, and the problems of reduction of energy storage density and compatibility caused by addition of a flame retardant are avoided; the prepared flame-retardant phase-change material is not cross-linked in the processing and reaction processes, so that the good processability of the flame-retardant phase-change material is retained; and the preparation method is simple, low in cost and beneficial to large-scale popularization.

Description

technical field [0001] The invention belongs to the technical field of flame-retardant phase-change heat storage materials and their preparation, and in particular relates to a flame-retardant phase-change material containing a Schiff base structure and its preparation method and application. Background technique [0002] Due to limited resources and the irreversible burning of fossil fuels (such as oil and coal, etc.), the sustainable development of energy is seriously threatened. In order to cope with the increasingly serious environmental pollution problems caused by the depletion of fossil fuels and the combustion process of fossil fuels, and to maintain sustainable development, renewable energy conversion and storage have received great attention. Among various energy storage methods, thermal energy storage technology has attracted much attention due to its key role in renewable energy storage infrastructure. Phase change materials (phase change materials, PCMs) are fu...

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Problems solved by technology

[0006] However, the addition amount of these additive flame retardants is relatively large when their flame retardancy is greatly improved, usually 20 to 40 wt%. On the one hand, it is inevitable to reduce the energy storage density of phase change materials, and the It is difficult for the agent to disperse uniformly in PCMs, and it will also affect the thermophysical properties of PCMs

On the other hand, the currently commonly used organic phase change materials are all small molecules, such as octadecane, octadecylamine, fatty acids, etc., with small molecular weight and low boiling point. Not only will they be vaporized before reaching their decomposition temperature, but the initial decomposition temperature Both are lower than the decomposition temperature of phosphorus-based and brominated flame retardants, and cannot achieve a good flame-retardant effect

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