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Phase-change microcapsule composition material and preparation method thereof

A technology of phase-change microcapsules and composite materials, which is applied in the field of phase-change microcapsule composite materials, can solve problems such as being unable to meet application requirements, and achieve the effects of low raw material cost, good sealing performance, and good coating rate

Inactive Publication Date: 2015-09-02
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This new type of composition made up from two different materials can have very specific properties at certain temperatures that make it useful for various applications such as thermal storage or energy transfer systems. It also allows for easy production without expensive equipment while still maintaining its effectiveness over time.

Problems solved by technology

In order to make better ways to manage thermal resources while reducing their impact on our environment through improved methods such as phase changes (PC) that involve absorbing or releasing specific amounts of heat depending upon its own temperatures. However, current techniques involving phase changing materials suffer drawbacks including limited usability due to poor solubility at low temperatures, difficulty in synthesis, high cost, and potential health hazards associated therewith. There is an urgent demand for effective and affordable greenhouse gas reduction measures without compromising safety concerns over fossil fuel sources.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 3.5g of MgCl 2 ·6H 2 O, use deionized water to make a saturated solution, add 0.45g sodium dodecylbenzenesulfonate, fully emulsify in a homogenizer for 40min, and then emulsify it in a constant temperature water bath at 50°C with a magnetic stirrer for 20min to obtain a uniform Emulsion (a): 2.8g of urea and 3.7g of formaldehyde were weighed and dissolved in deionized water to adjust the pH to 8.6. Stir at 70°C and 450rpm for 1 hour to obtain a transparent urea-formaldehyde resin prepolymer solution (b); slowly add the emulsion (a) to the prepolymer solution (b), adjust the pH to 3, and at 70°C, React at 600 rpm for 2.5 hours, vacuum filter, and wash with acetone and deionized water to obtain solid powder, which is the phase-change microcapsule composite material.

Embodiment 2

[0022] Weigh 6g MgCl 2 ·6H 2 O, make a saturated solution with ionized water, add 0.6g sodium dodecylbenzenesulfonate, fully emulsify in a homogenizer for 50min, and then emulsify it in a constant temperature water bath at 55°C with a magnetic stirrer for 40min to obtain a uniform emulsion (a); 1.7g urea and 2.3g formaldehyde were dissolved in deionized water and the pH was adjusted to be 8.6; at 73°C, stirred at a rotating speed of 500rpm for 2.5h to obtain a transparent urea-formaldehyde resin prepolymer solution (b); the emulsion (a ) slowly dropwise into the prepolymer solution (b), adjust the pH to 3, react at 72°C and 800rpm for 3h, vacuum filter, and wash with acetone and deionized water to obtain a solid powder, which is the phase transition Microcapsule composites.

Embodiment 3

[0024] Weigh 8.5g Mg(NO3) 2 2H 2 O, make a saturated solution with ionized water, add 0.8g sodium dodecylbenzene sulfonate, fully emulsify in a homogenizer for 60 minutes, and then emulsify it in a constant temperature water bath at 60°C with a magnetic stirrer for 60 minutes to obtain a uniform emulsion (a); 0.64g urea and 0.86g formaldehyde were dissolved in deionized water and the pH was adjusted to 8.6; at 75°C, stirred at a speed of 550rpm for 3h to obtain a transparent urea-formaldehyde resin prepolymer solution (b); the emulsion (a) Slowly add it dropwise to the prepolymer solution (b), adjust the pH to 3.5, react at 74°C and 700rpm for 3.5h, vacuum filter, and wash with acetone and deionized water to obtain a solid powder, which is the phase transition Microcapsule composites.

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PUM

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Abstract

The invention discloses a phase-change microcapsule composition material and a preparation method thereof. The material is a microcapsule of a core-wall structure and consists of a core material (1) and a wall material (2), wherein the core material is one or some of phase-change materials, namely, MgCl2.6H2O and Mg(NO3)2.2H2O and D-mannitol; the wall material is one or some of polystyrene, polymethyl methacrylate, urea resin and polyacrylonitrile or a composition material of the high-molecular polymer above and graphene; the core material (1) is 35 to 85% by mass based on the total mass of the microcapsule composition material, and the wall material (2) is 15 to 65% by mass based on the total mass of the microcapsule composition material; the phase-change point of the prepared phase-change microcapsule composition material is between 100 to 200 DEG C, and the particle size is 3 to 4 microns. The prepared phase-change microcapsule composition material is good in wrapping rate, high in sealing performance, high in phase-change latent heat, small in raw material cost, and simple in preparation process.

Description

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Claims

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Application Information

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Owner NANJING UNIV OF TECH
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