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A method for preparing phase-change microcapsules by hydrothermal method

A technology of phase change microcapsules and hydrothermal method, which is applied in heat exchange materials, chemical instruments and methods, bulk chemical production, etc., to achieve the effects of controllable product shape, simple reaction, and adjustable temperature

Active Publication Date: 2021-06-25
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no report on the direct use of hydrothermal reaction to synthesize phase change microcapsules

Method used

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  • A method for preparing phase-change microcapsules by hydrothermal method
  • A method for preparing phase-change microcapsules by hydrothermal method
  • A method for preparing phase-change microcapsules by hydrothermal method

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Effect test

Embodiment 1

[0030] A method for preparing phase-change microcapsules by hydrothermal method, comprising the following steps:

[0031] Step 1. Dissolve 8g of paraffin wax and 25mL of anionic surfactant styrene-maleic anhydride copolymer with a concentration of 2wt% and 50mL of deionized water into a mixed liquid in a constant temperature water bath at 80°C; emulsify with a high-shear emulsifier, The rotation speed is 19000r / min, and the emulsification time is 5min to obtain phase change material emulsion;

[0032] Step 2, 3.341g bismuth nitrate was dissolved in 80mL concentration of 2.5% nitric acid solution to make bismuth nitrate solution; 1.136487g sodium tungstate was dissolved in 80mL deionized water to make sodium tungstate solution; bismuth nitrate solution was dissolved in 0.02 Drop into the phase-change material emulsion at 80°C at a rate of mL / s, and stir for 3 hours at a speed of 600r / min; then drop the sodium tungstate solution into the phase-change material emulsion at a rate ...

Embodiment 2

[0037] A method for preparing phase-change microcapsules by hydrothermal method, comprising the following steps:

[0038] Step 1. Dissolve 8g of paraffin wax and 25mL of anionic surfactant styrene-maleic anhydride copolymer with a concentration of 2wt% and 50mL of deionized water into a mixed liquid in a constant temperature water bath at 80°C; emulsify with a high-shear emulsifier, The rotation speed is 19000r / min, and the emulsification time is 5min to obtain phase change material emulsion;

[0039]Step 2, 6.667g bismuth nitrate is dissolved in the nitric acid solution that 80mL concentration is 2.5% and makes bismuth nitrate solution; 2.632g borax is dissolved in 80mL deionized water and makes borax solution; Drop into the phase change material emulsion at 80°C and stir for 3h at a speed of 600r / min; then drop the borax solution into the phase change material emulsion at a speed of 0.005mL / s and stir for 1h at a speed of 300r / min. During the stirring process, ammonia water...

Embodiment 3

[0044] A method for preparing phase-change microcapsules by hydrothermal method, comprising the following steps:

[0045] Step 1. Dissolve 8g of paraffin wax and 25mL of anionic surfactant styrene-maleic anhydride copolymer with a concentration of 2wt% and 50mL of deionized water into a mixed liquid in a constant temperature water bath at 80°C; emulsify with a high-shear emulsifier, The rotation speed is 19000r / min, and the emulsification time is 5min to obtain phase change material emulsion;

[0046] Step 2, 3.341g bismuth nitrate was dissolved in 80mL concentration of 2.5% nitric acid solution to make bismuth nitrate solution; 1.136487g sodium tungstate was dissolved in 80mL deionized water to make sodium tungstate solution; bismuth nitrate solution was dissolved in 0.02 Drop into the phase-change material emulsion at 80°C at a rate of mL / s, and stir for 3 hours at a speed of 600r / min; then drop the sodium tungstate solution into the phase-change material emulsion at a rate ...

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Abstract

The invention discloses a method for preparing phase-change microcapsules by a hydrothermal method, comprising: preparation of phase-change material emulsion; dropping bismuth salt solution into the phase-change material emulsion, stirring, and then adding tungstate solution or borax solution Drop into the phase change material emulsion, stir, and in the process of stirring, use ammonia water to adjust and adjust the phase change material emulsion to be neutral, and obtain the phase change material emulsion containing the shell precursor; the phase change material emulsion containing the shell precursor Adding it into a hydrothermal reaction kettle for hydrothermal reaction; cooling the system after the hydrothermal reaction to room temperature, taking out the phase-change microcapsules, washing with deionized water, and drying to obtain the phase-change microcapsules. The invention adopts the hydrothermal method in the preparation of phase change microcapsules, which has the advantages of simple reaction, adjustable temperature and controllable product morphology; meanwhile, organic solid-liquid phase change material is used as the core material, which is an inorganic material with radiation protection function As the shell material, the prepared phase change microcapsules have dual functions of phase change energy storage and radiation protection.

Description

technical field [0001] The invention belongs to the technical field of preparing functional materials by a hydrothermal method, relates to a phase change energy storage material, and can be widely used in aerospace, textile materials, military affairs, etc., and specifically relates to a method for preparing phase change microcapsules by a hydrothermal method. Background technique [0002] As we all know, the development of renewable energy is the core and key to achieve sustainable development. Among them, the use of phase change materials with energy storage capacity for energy storage can help improve energy efficiency. Among many phase change materials, organic solid-liquid phase change materials have the advantages of chemical stability, high phase transition temperature, high safety and reliability, and are used as the material of choice for thermal energy storage. This material has been widely used in fields such as construction, food industry, heat pump systems, sma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06
CPCC09K5/063Y02P20/54
Inventor 杨文彬魏欢邓浩蔡天瑜周元林何韧范敬辉张凯
Owner SOUTHWEAT UNIV OF SCI & TECH
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