Phase-variable microcapsule and its production

A phase change microcapsule and phase transition technology, applied in microcapsule preparation, microsphere preparation, etc., can solve the problems of uneven thickness of microcapsule shell, easy independent nucleation of polymers, etc., and achieve good compactness and wide melting point range. , good heat resistance effect

Inactive Publication Date: 2007-11-21
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thickness of the microcapsule shell formed by this method is not uniform, and the polymer is

Method used

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  • Phase-variable microcapsule and its production
  • Phase-variable microcapsule and its production
  • Phase-variable microcapsule and its production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Dissolve 1g of thermosetting phenolic resin in 30g of ethyl acetate, then add 1g of hexadecane to form an organic solution. In a 100ml three-necked flask, add 20g of deionized water and 0.4g of gum arabic, stir to dissolve, emulsify 15g of the above organic solution at 30°C at a speed of 3000rpm, and add 20g of deionized water after emulsification for one hour After dilution, the resulting thin emulsion was evaporated under reduced pressure at 30°C for 40 minutes.

[0024] The above emulsion with the solvent evaporated was transferred to a high-pressure reactor, solidified in an oven at 150°C for 6 hours, and then naturally cooled to room temperature. The obtained microcapsule dispersion was centrifuged, washed three times with deionized water, washed once with ethanol and ethyl acetate, and finally dried in a vacuum oven at 50°C for 10 hours to obtain microcapsules.

[0025] The SEM photo of the obtained microcapsules is shown in Figure 2. The illustration in the figu...

Embodiment 2

[0028] Dissolve 2g of thermosetting phenolic resin in 30g of ethyl acetate, then add 1g of hexadecane to form an organic solution. In a 250ml three-necked flask, add 50g of deionized water and 1g of gum arabic. After stirring and dissolving, emulsify 30g of the above organic solution at 30°C at a speed of 3000rpm. After emulsifying for one hour, add 50g of deionized water to dilute. The resulting dilute emulsion was evaporated under reduced pressure at 30°C for 40 minutes.

[0029] The above emulsion with the solvent evaporated was transferred to a high-pressure reactor, solidified in an oven at 150°C for 6 hours, and then naturally cooled to room temperature. The obtained microcapsule dispersion was centrifuged, washed three times with deionized water, washed once with ethanol and ethyl acetate, and finally dried in a vacuum oven at 50° C. for 10 hours to obtain microcapsules.

[0030] The latent heat of phase change of the obtained microcapsules was 86.3 J / g, and the latent...

Embodiment 3

[0032] Dissolve 0.4g of thermosetting phenolic resin in 30g of ethyl acetate, then add 1g of hexadecane to form an organic solution. In a 100ml three-necked flask, add 20g of deionized water and 0.4g of gum arabic, stir to dissolve, and emulsify 15g of the above organic solution at 30°C at a speed of 3000rpm. After emulsification for one hour, add 20g of deionized water to dilute , The obtained dilute emulsion was distilled at 30° C. under reduced pressure for 40 minutes.

[0033] The above emulsion with the solvent evaporated was transferred to a high-pressure reactor, solidified in an oven at 150°C for 6 hours, and then naturally cooled to room temperature. The obtained microcapsule dispersion was centrifuged, washed three times with deionized water, and washed once with ethanol and ethyl acetate respectively. Finally, dry in a vacuum oven at 50° C. for 10 hours to obtain microcapsules.

[0034] Due to the thin wall of the obtained microcapsules, most of the capsule shells...

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Abstract

The invention is concerned with phase transition tiny capsule and its production. The phase transition tiny capsule relates to solid purse shell and phase transition inner core and the core is packed in the solid purse shell. The shell is thermosetting phenol-formaldehyde resin and the core is one or some alkane with 14 to 20 carbons. The method is easy to control the thickness of wall and the proportion of tiny purse shell and core is same as the ration of material. The shape of tiny purse shell is good with smooth surface and is not reuniting with certain shell and core structure. It has wide range of melting point and the capsule is well during the phase transition with long work time. The rigidity aromatic ring does well in bearing heat, and the capsule shell is phenol-formaldehyde resin and has good tight character and high anti-heating temperature.

Description

technical field [0001] The invention relates to a phase change microcapsule and a preparation method thereof. Background technique [0002] Because phase change microcapsules can absorb, store and emit a large amount of latent heat in the temperature range of phase change, so as to achieve the purpose of controlling the ambient temperature and saving energy, they have received more and more attention. It has broad application prospects in fields such as heat energy recovery. Phase-change microcapsules can generally be divided into two parts, a solid capsule shell and a phase-change core, and the phase-change core is wrapped in the solid capsule shell. A series of polymers have been used to prepare phase change microcapsule shells, such as melamine-formaldehyde resin, urea-formaldehyde resin, polyurethane, gelatin-formaldehyde resin, etc. temperature, which limits its field of application. [0003] There are many ways to prepare microcapsules with solid shell, liquid / solid...

Claims

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Application Information

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IPC IPC(8): B01J13/02
Inventor 赵彤姜言彬
Owner INST OF CHEM CHINESE ACAD OF SCI
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