Unlock instant, AI-driven research and patent intelligence for your innovation.

Lead tungstate housing phase-change microcapsule and preparation method thereof

A phase change microcapsule, lead tungstate technology, applied in chemical instruments and methods, other chemical processes, electrical components, etc., can solve the problems of insufficient thermal conductivity, phase change microcapsules not involving phase change microcapsules, leakage, etc. , to achieve the effect of low cost

Active Publication Date: 2018-08-24
SOUTHWEAT UNIV OF SCI & TECH
View PDF5 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the inorganic wall material phase-change microcapsules prepared by this method effectively overcome the shortcomings of the organic wall material reaction monomers such as irritation and toxicity, and have the characteristics of non-toxicity and flame retardancy, their thermal conductivity is not enough. The leakage problem is serious
[0004] None of the reported preparation methods of phase change microcapsules involve phase change microcapsules capable of both energy storage and radiation protection.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Lead tungstate housing phase-change microcapsule and preparation method thereof
  • Lead tungstate housing phase-change microcapsule and preparation method thereof
  • Lead tungstate housing phase-change microcapsule and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A preparation method of lead tungstate shell phase-change microcapsules, comprising the following steps:

[0032] Step 1. Mix 5g of stearic acid, 1.6g of sodium citrate, 32mL of an anionic surfactant styrene-maleic anhydride copolymer solution with a concentration of 2wt%, and 40mL of deionized water, and melt it into a liquid under a constant temperature water bath at 70°C The core material is emulsified by a high-shear emulsifier, the speed of the high-shear emulsifier is 10000r / min, and the time is 3min to obtain a phase change material emulsion;

[0033] Step 2: Take 4.17g of lead acetate and 3.62g of sodium tungstate, add 60mL of deionized water to dissolve them into solutions, drop the lead acetate solution into the phase change material emulsion at 70°C at a speed of 0.02mL / s, Stir at a rotating speed for 3 hours, then drop the sodium tungstate solution into the phase change material emulsion at a speed of 0.005mL / s, stir at a rotating speed of 300r / min for 8 hou...

Embodiment 2

[0037] A preparation method of lead tungstate shell phase-change microcapsules, comprising the following steps:

[0038] Step 1. Mix 5g of paraffin, 1.6g of sodium citrate, 32mL of an anionic surfactant styrene-maleic anhydride copolymer solution with a concentration of 2wt%, and 40mL of deionized water, and melt it into a liquid core material in a constant temperature water bath at 70°C , using a high-shear emulsifier to emulsify, the speed of the high-shear emulsifier is 10000r / min, and the time is 3min to obtain a phase change material emulsion;

[0039] Step 2: Take 4.17g of lead acetate and 3.62g of sodium tungstate, add 60mL of deionized water to dissolve them into solutions, drop the lead acetate solution into the phase change material emulsion at 70°C at a speed of 0.02mL / s, Stir at a rotating speed for 3 hours, then drop the sodium tungstate solution into the phase change material emulsion at a speed of 0.005mL / s, stir at a rotating speed of 300r / min for 8 hours, lead...

Embodiment 3

[0042] A preparation method of lead tungstate shell phase-change microcapsules, comprising the following steps:

[0043] Step 1. Mix 5g of paraffin, 1.6g of sodium citrate, 32mL of an anionic surfactant styrene-maleic anhydride copolymer solution with a concentration of 2wt%, and 40mL of deionized water, and melt it into a liquid core material in a constant temperature water bath at 70°C , using a high-shear emulsifier to emulsify, the speed of the high-shear emulsifier is 10000r / min, and the time is 3min to obtain a phase change material emulsion;

[0044] Step 2: Take 2.37g of lead acetate and 1.82g of sodium tungstate, add 60mL of deionized water to dissolve into a solution, drop the lead acetate solution into the phase change material emulsion at 70°C at a speed of 0.02mL / s, Stir at a rotating speed for 3 hours, then drop the sodium tungstate solution into the phase change material emulsion at a speed of 0.005mL / s, stir at a rotating speed of 300r / min for 8 hours, lead sal...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Latent heat valueaaaaaaaaaa
Phase transition temperatureaaaaaaaaaa
Login to View More

Abstract

The invention discloses a lead tungstate housing phase-change microcapsule and a preparation method thereof. The preparation method comprises the following steps: mixing a phase-change material, citrate, an emulsifier solution and deionized water, and emulsifying the mixture to obtain phase-change material emulsion; dropwise adding a lead salt solution into the phase-change material emulsion, stirring the solution and the emulsion, then dropwise adding a tungstate solution into the phase-change material emulsion, stirring the solution and the emulsion, generating lead tungstate precipitates through precipitation reaction of the lead salt and the tungstate, so as to form a housing wrapping a core material on the emulsion droplet surface of the phase-change material; cooling a reacted systemto room temperature, taking out the phase-change microcapsule, washing the phase-change microcapsule with deionized water, and drying the phase-change microcapsule, thus obtaining the lead tungstatehousing phase-change microcapsule. The lead tungstate housing phase-change microcapsule prepared by the preparation method disclosed by the invention solves the technical problems of leakage of the phase-change material, phase separation and supercooling and low thermal conductivity. Besides, the lead tungstate housing and a paraffin phase-change material have the capacity of shielding gamma-raysand neutrons, so that the lead tungstate housing phase-change microcapsule has two functions of phase-change energy storage and radiation prevention.

Description

technical field [0001] The invention belongs to the technical field of functional materials, relates to phase change energy storage materials and radiation protection materials, and can be widely used in aerospace, textile materials and military affairs, etc., and because the invention has dual functions of phase change energy storage and radiation protection Features, the invention especially relates to nuclear radiation protection clothing, military buildings and other technical fields that need to shield nuclear radiation and require a certain heat storage capacity. Background technique [0002] In recent years, the quest for renewable energy has become a focus due to energy shortages and a host of problems caused by the use of fossil fuels. As an energy-saving and environmentally friendly energy storage material, phase change materials can absorb or release a large amount of latent heat during the phase change process, thus attracting people's interest. Organic phase ch...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C09K5/06C09K3/00H05K9/00G21F1/02
CPCC09K3/00C09K5/063G21F1/02H05K9/0081
Inventor 杨文彬娄兰蒋卓妮何方方范敬辉张凯
Owner SOUTHWEAT UNIV OF SCI & TECH