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Organic phase-change material microcapsules in narrow particle size distribution and preparation method thereof

An organic phase and microcapsule technology, applied in the direction of microcapsule preparation, microsphere preparation, heat exchange materials, etc., can solve the problem of hindering uniform heat transfer temperature field, unfavorable phase change material control temperature and heat storage performance, organic phase change Microcapsule particles are difficult to meet the needs of fine compounding and processing

Active Publication Date: 2017-12-01
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For the existing organic phase change microcapsule particles with non-uniform or wide distribution of particle size, it is difficult to meet the fine compounding and processing requirements, which will hinder the formation of a uniform heat transfer temperature field, and is not conducive to giving full play to the temperature control and heat storage of phase change materials The problem of performance, and the time-consuming conventional emulsification method in the existing preparation of organic phase change microcapsules, the problem of limiting the preparation efficiency of organic phase change microcapsules, the invention provides an organic phase change material with a narrow particle size distribution Microcapsule and its preparation method

Method used

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  • Organic phase-change material microcapsules in narrow particle size distribution and preparation method thereof
  • Organic phase-change material microcapsules in narrow particle size distribution and preparation method thereof
  • Organic phase-change material microcapsules in narrow particle size distribution and preparation method thereof

Examples

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Embodiment 1

[0072] This embodiment provides an organic phase change material microcapsule and a preparation method thereof, the method sequentially includes an emulsion emulsification stage, a microencapsulation stage and a post-treatment stage;

[0073] specific:

[0074] (1) configuration mass concentration is the styrene-maleic anhydride copolymer solution of 2.5wt% as emulsifier, it is added in liquid paraffin and simply stirred to obtain pre-emulsion;

[0075] (2) the pre-emulsion prepared in step (1) is pressed through a porous membrane with a pore size of 10.1 μm under a membrane pressure of 0.1 MPa to obtain uniform emulsion droplets with a particle size for 4 times;

[0076] (3) The melamine-formaldehyde prepolymer solution whose mass concentration is 2.88wt% is prepared, and slowly added dropwise to the emulsion droplets prepared in step (2) under the condition of a stirring rate of 200r / min at 70°C, dripping After the addition is completed, increase the stirring rate to 600r / m...

Embodiment 2

[0080] This example provides an organic phase change material microcapsule and a preparation method thereof. In the method, except that the membrane pressure in step (2) is 0.3 MPa, other preparation methods and conditions are the same as those in Example 1.

[0081] The average particle size of the liquid paraffin microcapsules prepared in this example is 6.70 μm, the relative standard deviation is 0.33, the particle size distribution range is wider than that of Example 1, and the number of small particle size microcapsules increases.

[0082] The liquid paraffin microcapsule optical microscope photo that makes in the present embodiment is as figure 1 As shown, the scanning electron microscope pictures are shown as figure 2 As shown, the particle size distribution diagram is shown in Figure 4 As shown, it can be seen that the particle size distribution of the microcapsule product prepared in this embodiment is narrow, and the surface is smooth and dense, and basically no a...

Embodiment 3

[0085] This embodiment provides a kind of microcapsule of organic phase change material and preparation method thereof, described method is except that the number of passing membrane in step (2) is 1 time, and passing membrane pressure is 0.2MPa, other preparation methods and conditions are all the same as Same as in Example 1.

[0086] The average particle size of the liquid paraffin microcapsules prepared in this example was 14.51 μm, and the relative standard deviation was 0.30.

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Abstract

The invention provides organic phase-change material microcapsules in narrow particle size distribution and a preparation method thereof. The method sequentially comprises an emulsion emulsifying stage and a microencapsulation stage, wherein the emulsion emulsifying stage comprises the following steps: (1) preparing a pre-emulsion; (2) pressing the pre-emulsion obtained in the step (1) through a porous membrane to obtain emulsion drops. According to the organic phase-change material microcapsules provided by the invention, the range of particle size distribution is narrow, and the average particle size is controllable, thereby facilitating industrial production; the organic phase-change material microcapsules can be applied to the heat preservation and energy storage in building as well as the fields such as temperature regulating fiber, heat transfer fluid, electronic element cooling and thermal protection on biomedical micro devices with higher requirements on particle size, and solve the problems that uniform heat transfer is hard to realize by existing microcapsule particles in non-uniform distribution and the temperature control and heat storage properties of the phase-change material are not realized fully.

Description

technical field [0001] The invention belongs to the technical field of phase-change energy storage materials, and relates to an organic phase-change material microcapsule and a preparation method thereof, in particular to an organic phase-change material microcapsule with a narrow particle size distribution and a preparation method thereof. Background technique [0002] In recent years, in order to improve energy utilization efficiency and solve the contradiction between thermal energy supply and demand imbalance, phase change materials have been used more and more widely. As early as the 1940s, academic research on phase change materials had appeared, but it did not attract people's attention. In the 1960s, the United States began research on phase change materials and found that they have great application potential in thermal energy storage and temperature control. In the 1970s, microcapsule technology developed rapidly and began to be applied to phase change materials. ...

Claims

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Application Information

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IPC IPC(8): C09K5/06B01J13/02
CPCB01J13/02C09K5/063
Inventor 李建强李晓禹张英
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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