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A kind of wall phase change putty and preparation method thereof

A putty and phase change technology, applied in chemical instruments and methods, filling slurry, heat exchange materials, etc., can solve the problems affecting the service life of composite materials, the appearance of wall putty, the deterioration of heat storage and release performance of composite materials, and the damage of capsules, etc. To prevent the leakage and migration of hydrated salts, reduce adverse effects, and maintain the performance of heat storage and release

Active Publication Date: 2022-04-22
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of microcapsule technology to coat hydrated salt phase change materials has problems such as high cost and capsule damage.
[0005] Porous materials are used to load hydrated salts, and the combination of hydrated salts and porous materials can achieve the shaping of phase change materials to a certain extent, and alleviate the problems of molten state leakage and phase separation during the phase change process, but due to the existence of open channels in porous materials, composite The hydrated salt in the system is only fixed in the pores by adsorption. During the phase transition process, it can still migrate out of the pores through the open pores in a way of "climbing the wall", and the water volatilized by the molten hydrated salt can still pass through the open pores. The above two phenomena will cause the deterioration of the heat storage and release performance of the composite material in the long-term application process, which will affect the service life of the composite material and the appearance of the wall putty

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A preparation method for wall phase-change putty, comprising the following steps:

[0049] Step 1, take manganese nitrate hexahydrate phase-change material (hydrated salt), nucleating agent (manganese chloride tetrahydrate) and expanded vermiculite (porous material) by weight ratio 77:3:20, expanded vermiculite particle size is 150 purpose, mix evenly, melt manganese nitrate hexahydrate phase change material at 50°C, make it evenly and fully absorbed by expanded vermiculite, cool to below 20°C, and obtain manganese nitrate hexahydrate-expanded vermiculite composite;

[0050] Step 2, preparation contains 1wt% sodium hydroxide (precipitating agent), 5wt% sodium montmorillonite (inorganic gelling agent) and 1%wt sodium carboxymethyl cellulose (organic gelling agent), and the balance is water-soluble silicon the hydrosol;

[0051] Step 3, uniformly spray the obtained hydrosol on the surface of the manganese nitrate hexahydrate-expanded vermiculite composite according to th...

Embodiment 2

[0059] A preparation method for wall phase-change putty, comprising the following steps:

[0060] Step 1, take calcium nitrate tetrahydrate and zinc nitrate hexahydrate by weight ratio 45:55, make calcium nitrate tetrahydrate and zinc nitrate hexahydrate phase change material, take calcium nitrate tetrahydrate by weight ratio 69:1:30 - Zinc nitrate hexahydrate phase change material (hydrated salt), nucleating agent (sodium chloride) and expanded perlite (porous material), the expanded perlite particle size is 250 mesh, mix well, and melt calcium nitrate tetrahydrate at 40°C - Zinc nitrate hexahydrate phase change material, so that it is evenly and fully absorbed by expanded perlite, cooled to below 20°C, and calcium nitrate tetrahydrate-zinc nitrate hexahydrate-expanded perlite composite is obtained;

[0061] Step 2, preparing a hydrosol containing 2wt% oxalic acid dihydrate (precipitating agent), 2wt% hectorite (inorganic gelling agent) and 1%wt polyacrylic acid (organic gell...

Embodiment 3

[0070] A preparation method for wall phase-change putty, comprising the following steps:

[0071] Step 1, take by weight ratio 83:1:1:15 potassium fluoride tetrahydrate phase change material (hydrated salt), nucleating agent (stannous fluoride, sodium dihydrogen phosphate dodecahydrate) and porous silicon (porous Material), the particle size of porous silicon is 400 mesh, mix evenly, melt potassium fluoride tetrahydrate phase change material at 30 ℃, make it be uniformly and fully absorbed by porous silicon, cool to room temperature, and obtain potassium fluoride tetrahydrate-porous silicon composite thing;

[0072] Step 2, prepare the hydrosol (organic gelling agent) containing 3wt% calcium hydroxide (precipitating agent), 3wt% bentonite (inorganic gelling agent) and 1%wt xanthan gum;

[0073] Step 3, impregnating the potassium fluoride tetrahydrate-porous silicon composite in the obtained hydrosol according to the mass ratio of 9:1, ultrasonically exhausting, taking out the c...

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PUM

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Abstract

The invention discloses a phase-change putty and a preparation method thereof. The invention uses a natural inorganic porous material as a carrier, loads a hydrated salt phase-change energy storage material, prepares a hydrated salt-porous carrier composite, and then wraps it with water-soluble silicon or water glass The hydrated salt-porous carrier composite is prepared after dehydration to obtain the hydrogel-coated hydrated salt-porous material composite phase change energy storage material, and the hydrogel-coated hydrated salt-porous material composite phase change The energy storage material is mixed with the putty to obtain the phase change putty. The phase change putty realizes the isolation of the hydrated salt phase change material and the putty, and maintains the heat storage and release performance of the hydrated salt phase change material, while the hydrogel multilayer coating prevents the hydrated salt phase change material from being mixed with the putty. During the process and during the application of phase change putty, the possible leakage and migration of hydrated salt makes the hydrated salt phase change material be applied in putty.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a phase putty and a preparation method thereof. Background technique [0002] Phase change energy storage technology is to use materials to absorb or release a large amount of heat energy during the phase change process, thereby playing the role of temperature control and energy storage, which can solve the contradiction between energy supply and demand in terms of time and space distribution imbalance, and is an important way to improve energy efficiency. Effective means of utilizing efficiencies. Phase change energy storage materials are the core of phase change energy storage technology. Combining phase-change energy storage materials with putty can not only stabilize the temperature change during the aging process of putty, but also effectively improve the energy storage capacity and energy-saving effect of buildings. [0003] At present, most of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D5/34C09D5/32C09K5/06
CPCC09D5/34C09D5/32C09K5/063
Inventor 孙进贺王明勇贾永忠邵斐景燕张鹏瑞谢绍雷张茜黄超驰
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI