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Two-stage micro-packaging composite heat storage material and preparation method and use thereof

A technology of composite heat storage materials and packaging materials, which is applied in the field of two-stage micro-encapsulation composite heat storage materials and its preparation, can solve problems such as insufficient tightness, and achieve uniform heating, tight bonding, and improved bonding effects

Active Publication Date: 2019-05-21
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above methods increase the density of the material to a certain extent and reduce leakage, but they are only sintered after pressing and forming. Before pressing and forming, they are simply mixed and not fully uniform. There are still pores inside the composite material during subsequent sintering, which is not compact enough. In order to make the combination between the phase change material and the carrier material more compact and increase the proportion of the phase change material, it is necessary to improve the preparation process

Method used

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  • Two-stage micro-packaging composite heat storage material and preparation method and use thereof
  • Two-stage micro-packaging composite heat storage material and preparation method and use thereof
  • Two-stage micro-packaging composite heat storage material and preparation method and use thereof

Examples

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Embodiment 1

[0056] This embodiment provides a method for preparing a two-stage microencapsulated composite heat storage material, the method comprising the following steps:

[0057] (a) Dry silica at 105°C for 6 hours, dry at 105°C, and the particle size after ball milling is D 50 50μm phase change material 6h, and after treatment D 50 Silica with a thickness of 5 μm is uniformly mixed with the treated phase-change material at a mass ratio of 1:4, and the phase-change material is formed by uniformly mixing sodium nitrate and potassium nitrate at a mass ratio of 3:2;

[0058] (b) heating up to 250°C at a heating rate of 5°C / min, and pre-sintering the mixed materials in step (a) for 60 minutes at 250°C to obtain a premix;

[0059] (c) Press step (b) gained premix at 60MPa for 2min to obtain a cylinder with a diameter of 20mm and a thickness of 1mm;

[0060] (d) Heating up to 250° C. at a heating rate of 5° C. / min, sintering the cylinder obtained in step (c) for 120 minutes, and cooling na...

Embodiment 2

[0063] This embodiment provides a method for preparing a two-stage microencapsulated composite heat storage material, the method comprising the following steps:

[0064] (a) Dry silica at 110°C for 5 hours, dry at 110°C, and the particle size after ball milling is D 50 40μm phase change material 5h, and after treatment D 50 The silicon dioxide with a thickness of 3 μm is uniformly mixed with the treated phase-change material at a mass ratio of 1:4, and the phase-change material is uniformly mixed with sodium nitrate and potassium nitrate at a mass ratio of 1:1;

[0065] (b) heating up to 240°C at a heating rate of 3°C / min, and pre-sintering the mixed materials in step (a) for 50 minutes at 240°C to obtain a premix;

[0066] (c) Press step (b) gained premix under 40MPa for 1.5min to obtain a cylinder with a diameter of 15mm and a thickness of 1.5mm;

[0067] (d) Heating up to 240°C at a heating rate of 3°C / min, sintering the cylinder obtained in step (c) for 150min, and cooli...

Embodiment 3

[0070] This embodiment provides a method for preparing a two-stage microencapsulated composite heat storage material, the method comprising the following steps:

[0071] (a) Dry silica at 120°C for 4 hours, and dry at 120°C for particle size D after ball milling 50 55μm phase change material 4h, and after treatment D 50 SiO2 with a thickness of 6 μm is uniformly mixed with the treated phase-change material at a mass ratio of 1:4, and the phase-change material is formed by uniformly mixing sodium nitrate and potassium nitrate at a mass ratio of 3:1;

[0072] (b) heating up to 260°C at a heating rate of 7°C / min, and pre-sintering the mixed materials in step (a) for 40 minutes at 260°C to obtain a premix;

[0073] (c) Press step (b) gained premix at 30MPa for 2.5min to obtain a cylinder with a diameter of 30mm and a thickness of 2mm;

[0074] (d) Raise the temperature to 260° C. at a heating rate of 7° C. / min, sinter the cylinder obtained in step (c) for 90 minutes, and cool na...

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Abstract

The invention belongs to the field of heat storage materials, and relates to a two-stage micro-packaging composite heat storage material and a preparation method and use thereof. The preparation method comprises the following steps that (1) a shaped packaging material and a phase change material are pre-sintered after being mixed; (2) a premix obtained after pre-sintering treatment is subjected topress forming and sintered to obtain the micro-packaging composite phase change heat storage material. According to the method, by setting the pre-sintering step, the bonding effect of the phase change material and the shaped packaging material is improved; by sequentially carrying out the process steps of pre-sintering, press forming and re-sintering, the phase change material is uniformly adsorbed into pores of the shaped packaging material, so that the prepared micro-packaging composite phase change heat storage material is high in heat storage density and good in forming degree and has nocracking phenomenon; by adjusting the mass ratio of sodium nitrate to potassium nitrate, the phase change enthalpy of the two-stage micro-packaging composite heat storage material can vary within 74.5-93.67 J / g.

Description

technical field [0001] The invention belongs to the field of heat storage materials and relates to a composite heat storage material and its preparation method and application, in particular to a two-stage micro-encapsulated composite heat storage material and its preparation method and application. Background technique [0002] Microencapsulated composite phase change materials can overcome the shortcomings of single phase change materials, and can also improve the thermal and mechanical properties of phase change materials. It is a hot spot and trend in the field of heat storage materials. Nitrate-based phase-change materials have large latent heat and thermal conductivity, and the melting point can be adjusted by the ratio of salts. They are cheap and are a research hotspot in the field of heat storage materials. [0003] Alexander et al. ("Phase relations in heat transfer salt systems", "IndustrEng Chem" 1993, Volume 39, No. 8, Page 1044) showed that the binary molten sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
Inventor 黄云王燕姜竹黄巧田傲雪姚华王娜峰
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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