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Phase-change material microcapsule and preparation method thereof

A technology of phase change materials and microcapsules, which is applied in the direction of microcapsule preparation, microsphere preparation, heat exchange materials, etc., can solve the problems of increasing process steps and complicated preparation process, and achieve simple process, convenient operation and wide application range Effect

Inactive Publication Date: 2010-05-05
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology prepares microcapsules with excellent physical and mechanical properties by coating the outer wall of melamine resin on the inner layer with modified melamine resin. Obviously, this technology increases the process steps and makes the preparation process more complicated.

Method used

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  • Phase-change material microcapsule and preparation method thereof
  • Phase-change material microcapsule and preparation method thereof
  • Phase-change material microcapsule and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Microcapsule mass percentage composition design is:

[0072] Oil phase 190g, wherein radical polymerizable monomers include methyl acrylate (MA) 28g, n-butyl methacrylate 10g, styrene (St) 15g, crosslinking agent glycerol trimethacrylate 18g, phase change material 117 g of 1-bromooctadecane (Broct) and 2 g of the initiator azobisisoheptanonitrile.

[0073] Water phase 1000g, wherein deionized water (abbreviated as water) 970g, emulsifier sodium lauryl sulfate 10g, co-emulsifier 1-tetradecyl alcohol and 10g and stabilizer polyethylene glycol (number average molecular weight 600) 10g.

[0074] The mass percentage of the oil phase in the mixed liquid is 16%.

[0075] The preparation method of the microcapsules is as follows: First, at a temperature I of 40° C. and a stirring speed I of 600 rpm, the mixture of the free radical polymerization monomer, crosslinking agent, organic phase change material and initiator in the mass percentage is stirred evenly , to make an oil p...

Embodiment 2

[0078] The mass percent of microcapsules consists of:

[0079] Oil phase 600g, wherein radical polymerization monomer comprises methylstyrene (MSt) 265g, crosslinking agent divinylbenzene (DVB) 28g, phase change material 1-bromoeicosane (Brei) 300g and free polymerization initiator Azobisisobutyronitrile (AIBN) 7g.

[0080] Water phase 2400g, wherein water 2352g, emulsifier sorbitol oleate (Span 80) 24g, stabilizer polyvinyl alcohol (polymerization degree 1750, hydrolysis degree 98%) 24g.

[0081] The mass percentage of the oil phase in the mixed liquid is 20%.

[0082] The preparation method of the microcapsules is as follows: First, at a temperature I of 60° C. and a stirring speed I of 800 rpm, the mixture of the free radical polymerization monomer, crosslinking agent, organic phase change material and initiator in the mass percentage is stirred evenly , to make an oil phase; at a temperature I of 60°C and a stirring speed I of 800rpm, the mass percent emulsifier, co-emul...

Embodiment 3～5

[0085] Using the same process conditions as in Example 2, only changing the mass percentage of 1-bromoeicosane and polymerized monomers and crosslinking agents, phase change material microcapsules with different 1-bromoeicosane contents were obtained. As shown in Table 1. The mass percent compositions of embodiment 3-5 microcapsules are respectively:

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Abstract

The invention relates to a phase-change material microcapsule and a preparation method thereof. The microcapsule is prepared by a mixed liquor of an oil-phase component and an aqueous phase component; the oil-phase component accounts for 9-30% of the mixed liquor according to the mass percentage (the same below); the oil-phase component comprises 28-49% of free radical polymerization monomer, 1-9% of crosslinker, 44-70% of organic phase-change material and 1-2% of initiating agent; the aqueous phase component comprises 80-90% of deionized water and 1-20% of emulsifier; the surface of the microcapsule has one or more than hollows, the average grain diameters of which are less than or equal to 90mum and the total volume of which accounts for 20-40% of the microcapsule according to the volume percent; the thermal decomposition temperature of the microcapsule is larger than or equal to 230 DEG C. The preparation method adopts the mass percent composition of the microcapsule and the following technique: firstly, the well-mixed oil phase component is added into the well-mixed aqueous phase solution in the temperature I and the stirring speed I, and stirred into a mixed emulsion in the stirring speed II; and then the temperature of the mixed emulsion is raised to II; and finally the mixed emulsion is filtered, separated, mixed, washed with deionized water for 2 to 5 times after being fully stirred, thus obtaining the microcapsule wet cake; or the microcapsule wet cake is dried till reaching constant weight, thus obtaining the microcapsule dry powder.

Description

technical field [0001] The invention relates to phase-change material microcapsule technology, in particular to a phase-change material microcapsule with thermal energy storage and utilization functions and a preparation method thereof. Background technique [0002] Phase change material is an energy-saving and environmentally friendly material that was discovered in the 1960s and developed and applied after the 1970s. It is also a clean energy storage material. During the phase change process, phase change materials can absorb or release a large amount of latent heat of phase change, and are widely used in HVAC, energy-saving buildings, solar energy utilization, clothing and other fields, and are of great significance in "energy saving and emission reduction". Phase change material microcapsules are phase change material particles coated with polymer materials, metal materials or non-metal materials. The permanent solidification of the phase change material can be achieved...

Claims

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Application Information

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IPC IPC(8): C09K5/04B01J13/16
Inventor 张兴祥由明单新丽王建平王学晨
Owner TIANJIN POLYTECHNIC UNIV
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