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A kind of manganese dioxide-melamine formaldehyde resin double-shell composite phase change material and preparation method thereof

A composite phase change material, melamine technology, applied in chemical instruments and methods, manganese oxide/manganese hydroxide, microsphere preparation, etc., can solve problems such as poor photothermal performance, easy aggregation of nanoparticles, and difficulty in achieving additive effects. Achieve the effects of good leak-proof performance, high photothermal performance, and good thermal cycle stability

Active Publication Date: 2021-07-02
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] (1) Most microcapsule phase change materials have the defect of poor photothermal performance in application
[0009] (2) Adding metal oxides can further effectively improve the photothermal performance of microcapsules, but the added nanoparticles are easy to agglomerate during emulsification, and it is difficult to achieve a better adding effect

Method used

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  • A kind of manganese dioxide-melamine formaldehyde resin double-shell composite phase change material and preparation method thereof
  • A kind of manganese dioxide-melamine formaldehyde resin double-shell composite phase change material and preparation method thereof
  • A kind of manganese dioxide-melamine formaldehyde resin double-shell composite phase change material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] A kind of preparation method of manganese dioxide-melamine formaldehyde resin double-shell composite phase change material:

[0056] Step 1) Pretreatment of raw materials, weigh 6g of melamine, 10ml of formaldehyde, and 10ml of deionized water in a single-necked flask, stir and mix evenly at room temperature to obtain solution A, and then dropwise add triethanolamine solution with a volume fraction of 50% to adjust the pH value to 9, then stirred at 70°C for 1 hour for prepolymerization to obtain a prepolymer, and another 25 g of n-octadecane and 7.5 g of styrene maleic anhydride, wherein the styrene maleic anhydride was first prepared as mass Styrene maleic anhydride solution with a fraction of 5% is emulsified under the conditions that the rotation speed is 2500r / min, the emulsification temperature is 70, and the emulsification time is 2 hours to obtain an emulsion;

[0057] Step 2) Preparation of microcapsules. Under the conditions of temperature 70°C and rotational ...

Embodiment 2

[0079] A method for preparing a manganese dioxide-melamine formaldehyde resin double-shell composite phase change material, the steps not specifically described are the same as in Example 1, except that the quality of manganese sulfate in the step 3 is 0.065g, 0.0167 The volume of g / mL potassium permanganate is 15ml, and the resulting sample is named 3wt% MnO 2 microcapsule.

[0080] In order to prove the phase change properties of manganese dioxide-melamine formaldehyde resin double-shell composite phase change materials, differential scanning calorimetry (DSC) tests were carried out. The result is as Figure 4 As shown, the melting temperature of the manganese dioxide-melamine formaldehyde resin double-shell composite phase change material is 29.70°C, and the crystallization temperature is 23.50°C; the measured latent heat of phase change is 152.71J / g and 151.74J / g.

[0081] In order to prove the photothermal conversion effect of manganese dioxide-melamine formaldehyde re...

Embodiment 3

[0083] A method for preparing a manganese dioxide-melamine formaldehyde resin double-shell composite phase change material, the steps not specifically described are the same as in Example 1, except that the quality of manganese sulfate in the step 3 is 0.10g, 0.0167 The volume of g / mL potassium permanganate is 25ml, and the resulting sample is named 5wt% MnO 2 microcapsule.

[0084] In order to prove the phase change properties of manganese dioxide-melamine formaldehyde resin double-shell composite phase change materials, differential scanning calorimetry (DSC) tests were carried out. The result is as Figure 4 As shown, the melting temperature of the manganese dioxide-melamine formaldehyde resin double-shell composite phase change material is 29.64°C, and the crystallization temperature is 23.61°C; the measured latent heat of phase change is 142.13J / g and 141.44J / g.

[0085] In order to prove the photothermal conversion effect of manganese dioxide-melamine formaldehyde res...

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Abstract

The invention discloses a manganese dioxide-melamine-formaldehyde resin double-shell composite phase change material, which utilizes redox method and electrochemical adsorption method to prepare melamine-formaldehyde resin microcapsules, and then constructs MnO on the surface of the microcapsules 2 nanolayers, forming a double-shell spherical structure. Among them, the negative charge is achieved by modifying the surface of the microcapsules, and the further construction of MnO is achieved through redox reactions. 2 nanolayer; MnO 2 The microscopic morphology of the nanolayer is composed of nanoparticles and nanowires. The preparation method includes the following steps: 1) pretreatment of raw materials; 2) preparation of microcapsules; 3) MnO 2 Shell preparation. The photothermal conversion efficiency of the application as a phase change material is 93%-99%; the phase change temperature is 10-29°C, and the latent heat of phase change is 116-169J / g. The invention has the following advantages: 1. Effectively solve the leakage problem in the phase transition process; 2. High light-to-heat conversion efficiency; 3. High phase transition latent heat and thermal stability.

Description

technical field [0001] The invention relates to the field of phase change energy storage materials, in particular to a manganese dioxide-melamine formaldehyde resin double-shell composite phase change material and a preparation method thereof. Background technique [0002] In today's society, human society continues to develop and accelerate the degree of global industrialization, and the corresponding energy demand is also increasing, and global energy is increasingly exhausted. Building energy consumption accounts for a large proportion of the overall energy consumption of the society. How to reduce building energy consumption and develop new building energy-saving materials and technologies has become a research hotspot for sociologists today. Solar energy is an abundant renewable energy source, and the conversion of solar energy into thermal energy is a direct and effective application of solar radiation. However, the intermittent nature of the sun in time and space red...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06B01J13/14C01G45/02B82Y40/00B82Y30/00
CPCB01J13/14B82Y30/00B82Y40/00C01G45/02C09K5/063
Inventor 张焕芝吴博竞朱钰漕张青峰荆锐孙宗旭夏永鹏魏胜孙立贤徐芬
Owner GUILIN UNIV OF ELECTRONIC TECH
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