Phase-change energy storage dual-limit temperature-regulating mortar and preparation method thereof

Abstract

The invention discloses phase-change energy-storage dual-limit temperature adjustment mortar and a preparation method thereof. The phase-change energy-storage dual-limit temperature adjustment mortar comprises the following raw materials in parts by weight: 25 parts of cement, 20-55 parts of medium sand, 10-30 parts of phase-change microcapsules, 10-40 parts of expanded perlite shape-stabilized phase-change particles, 0.25-1 part of fibers, 0.2-0.5 parts of cellulose ether, 1.5-3 parts of redispersible latex powder and 25-30 parts of water, wherein the phase-change temperature of the phase-change microcapsules is 18-20 DEG C and the phase-change temperature of the expanded perlite shape-stabilized phase-change particles is 26-28 DEG C. The phase-change energy-storage dual-limit temperature adjustment mortar prepared by the method has a dual-limit temperature adjustment function, not only can remarkably adjust a room temperature to be within upper and lower limit ranges of a comfortable temperature of a human body and improve thermal comfort of a human settlement environment but also improves energy-storage and temperature-adjustment capabilities of a phase-change mortar product and overcomes performance deficiencies existent during addition of a single phase-change medium through compound addition of two phase-change mediums, that is to say, the phase-change microcapsules and the expanded perlite shape-stabilized phase-change particles.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a phase-change energy storage dual-limit temperature-regulating mortar and a preparation method thereof. Background technique [0002] In modern buildings, especially high-rise buildings, lightweight envelope structures have been used more and more widely, mainly because lightweight envelope structures can not only greatly reduce the self-load of building structures, but also have good thermal resistance. , can improve the thermal insulation effect of the building envelope. However, due to the small heat capacity and poor heat storage capacity of the lightweight enclosure structure, it cannot absorb and store a large amount of solar radiant heat during the day, causing the indoor temperature to be too high during the day and too low at night, with large diurnal fluctuations and poor thermal comfort. This results in an increase in air conditioning and heating energy ...

AI Technical Summary

Problems solved by technology

However, since the wall material of phase change microcapsules is an organic material, when added into the cement-based mortar matrix, defects will occur at the interface junction. When the amount is large, the strength of the hardened mortar will be significantly reduced, the possibility of cracking will be increased, and the phase change will be slightly The cost of the capsule is relatively high, and it is not suitable for a large amount of mixing, which eventually leads to the restriction of the energy storage and temperature adjustment capabilities of the mortar

It can be seen that there are certain technical and economic problems in adding inorganic porous-based shape-fixed phase-change particles or phase-change microcapsules alone, and it is difficult to obtain a substantial improvement in the energy storage and temperature regulation function.

[0007] In addition, the existing phase-change energy storage temperature-regulating mortar products generally only have a single phase-change temperature point, and the temperature-regulating function has limitations. When the indoor temperature is in different ranges in different seasons, the phase-change temperature point with a single phase It is difficult for variable mortar to exert energy storage and temperature regulation functions for a long time

For example, the phase change mortar with a phase change temperature of about 28 degrees Celsius can only play a role in summer after repeated phase changes, but it is difficult to play a role in cold seasons when the indoor temperature is low; the phase change mortar with a phase change temperature of about 18 degrees Celsius can only In autumn and winter, it has the significance of indoor energy storage and temperature regulation, but in summer, the phase change material is in a melting state for a long time, and the solid-liquid phase transition cannot occur, and loses the function of energy storage and temperature regulation

Therefore, the phase change mortar with a single phase change temperature point has fewer effective phase change reactions throughout the year, and the energy storage and temperature regulation effects are not significant enough.