Hidden heat energy storage type gypsum-based construction material

Abstract

The invention discloses a latent heat storage type gypsum-based building material which is formed by combining a composite phase change material with building gypsum, wherein, the composite phase change material takes expanded graphite as a adsorbing medium; the mixing amount of the composite phase change material is 3 percent-6 percent of the total amount of the material; the mixing amount of the building gypsum is 94 percent-97 percent of the total amount of the material; the expanded graphite is made from expandable graphite, namely crystalline flake graphite processed by intercalation, the expandable graphite presents a flake shape, the granularity is 40-60 meshes, the carbon content is larger than or equal to 99 percent, and the expansion multiple is 200 mL / g-300 mL / g; and the phase change material is paraffin wax, the phase-transition temperature thereof is 50 DEG C-70 DEG C, the phase-transition temperature of butyl stearate is 18 DEG C-24 DEG C, and the phase-transition temperature of palmitic propyl ester is 18 DEG C-24 DEG C. The building material can play the roles of adjusting the environmental temperature and reducing the building energy consumption without influencing original functions.

Description

technical field [0001] The invention is a composite building material with building energy-saving function, specifically, it is a new type of gypsum-based building material prepared by compounding porous gypsum building material and functional material with latent heat storage function. Background technique [0002] Latent heat energy storage materials, in the process of their own phase change, due to the high energy storage density per unit volume (mass) of the material, are used within the phase change temperature range, and can be kept at a certain temperature for heat absorption and heat release. It has good stability and high safety performance, and is a functional material with good thermal effect. Combining it with porous gypsum building materials can produce latent heat energy storage gypsum-based building materials. Using such a multifunctional building material adds functions to the building without occupying additional building space, reducing building costs. It i...

AI Technical Summary

Problems solved by technology

[0004] The main problems in the preparation of materials in this field at this stage are: (1) The liquid phase control problem during the use of latent heat energy storage materials

However, when the substance is in the liquid state, it often faces flow and leakage problems

(2) Modification of thermophysical properties of phase change materials

Existing research mainly focuses on the synthesis, preparation and utilization of phase change materials, and the modification of the material itself, especially the improvement of thermal properties, is insufficiently considered.