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Preparation method of phase-change material microcapsule

A phase change material and microcapsule technology, applied in the field of preparation of phase change material microcapsules, can solve the problems of low encapsulation yield, easy leakage, difficult reaction, etc., and achieves easy control of reaction speed, high encapsulation yield, Density-enhancing effect

Inactive Publication Date: 2010-06-02
TIANJIN POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0009] However, the above-mentioned methods may have the following disadvantages: (1) the microcapsule wall of most methods adopts melamine-formaldehyde resin, and the formaldehyde therein may cause harm to users, and does not have environmental protection; (2) interfacial polymerization The reaction speed of the prepared polyurea microcapsules is extremely fast, and the reaction is difficult to control, causing the microcapsule wall material to be loose and easy to leak; (3) the emulsifier used in the preparation of phase change material microcapsules by emulsion polymerization has a single function, which is not conducive to the formation of microcapsules, resulting in relatively Low encapsulation yield; (4) microcapsule-coated phase change materials are limited to application in building interior walls (phase change materials for exterior walls have not been reported)
[0010] Within the scope of the applicant's search, the preparation method of phase change material microcapsules of the present invention has not been reported

Method used

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  • Preparation method of phase-change material microcapsule
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  • Preparation method of phase-change material microcapsule

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preparation example Construction

[0035] Specifically, the processing steps of the preparation method of the present invention include:

[0036] (1) Preparation of oil phase

[0037] 10-60 parts by weight of phase change material, 5-10 parts of lipophilic vinyl radical monomer, 0.1-5 parts of hydrophilic vinyl radical monomer, 0.1-5 parts of Oil-soluble monomers are mixed. If an oil-soluble initiator is used, 0.05 to 1 part of the oil-soluble initiator is added, dissolved and heated to a temperature above the phase change point of the phase change material to obtain an oil phase;

[0038] (2) Preparation of water phase

[0039] Dissolve 0.1-5 parts of functional surfactant in 100-500 parts of water, and heat to the temperature above the phase transition point of the phase change material. If a water-soluble initiator is used, then 0.05-1 part of water-soluble initiator agent is added to obtain the aqueous phase;

[0040] (3) Preparation of emulsion

[0041] The oil phase is added to the water phase at a te...

Embodiment 1

[0051] (1) Preparation of the oil phase: the phase transition point of 13g is mixed with the phase change material of 24°C and the methyl methacrylate of 3.7g, the methacrylic acid of 1.9g and the benzoyl peroxide of 0.2g, heated to At 45°C, an oil phase is formed after dissolution;

[0052] (2) Preparation of the water phase: dissolving 2 g of the functional surfactant sodium oleate in 100 g of distilled water and heating to 45° C. to form the water phase;

[0053] (3) Preparation of emulsion: place the water phase on a high-speed shear emulsifier and adjust the rotating speed to 1600 rpm, slowly add the oil phase, and emulsify for 15 minutes to form a stable emulsion;

[0054] (4) Preparation of phase-change material microcapsules: under nitrogen protection, adding a reflux device and a stirring speed of 500 rpm, the emulsion is gradually warmed up to 75°C and kept for 4.5 hours, then the heating is stopped, cooled to room temperature, the mixture is filtered, Washing with ...

Embodiment 2

[0058] (1) Preparation of the oil phase: 10.0 g of phase change materials with a phase transition temperature of 24° C., 5.712 g of styrene, 0.5085 g of methacrylic acid, 0.2401 g of butylene glycol diacrylate and 0.3019 g of diacrylate Mix nitrogen diisobutyronitrile, heat to 55°C, and form an oil phase after dissolving;

[0059] (2) Preparation of the water phase: 4 g of methacryloxyethyl dodecyl dimethyl ammonium bromide was dissolved in 200 g of distilled water, and heated to 55° C. after dissolving to form a water phase;

[0060] (3) Preparation of emulsion: Mix the oil phase with the water phase, stir at low speed and pre-emulsify for 10 minutes, keep the temperature at 55°C and emulsify in an ultrasonic emulsifier for 5 minutes to form a stable emulsion;

[0061] (4) Preparation of phase change material microcapsules: Under nitrogen protection, add reflux device and at a stirring speed of 300 rpm, the emulsion is gradually warmed up to 75°C and kept for 3 hours, stop th...

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Abstract

The invention discloses a preparation method of a phase-change material microcapsule, comprising the following steps of: mixing the core material and the monomer of a phase-change material designed with a phase-change temperature according to a certain proportion, uniformly stirring and heating to the temperature higher than the phase-change point of the core material of the phase-change material to enable the core material and the monomer to be fully dissolved and prepared into an oil phase; dissolving a functional surface active agent in water, heating the mixture to the temperature higher than the phase-change point of the phase-change material and then preparing the mixture into a water phase, wherein an oil-solubility initiating agent is only added in the oil phase preparing process or a water-solubility initiating agent is only added in the water phase preparing process; adding the oil phase in the water phase, preparing an emulsion with a high-shear emulsifying method or a pre-emulsifying and ultrasonic emulsifying method and then deoxidizing, wherein the water-solubility initiating agent is added, the emulsion is polymerized at a certain temperature, the polymerization reaction directionally occurs on the surface of the emulsion drip by adopting a emulsion polymerizing method, and then the phase-change material microcapsule with the required phase-change temperature is obtained.

Description

technical field [0001] The invention relates to a functional material manufacturing technology, in particular to a preparation method of an environment-friendly phase change material microcapsule. Background technique [0002] Phase change (energy storage) materials are an environmentally friendly and energy-saving material that has developed rapidly in recent years. It has been widely used in construction, clothing, HVAC, solar energy utilization and other fields, which is of great significance. [0003] S.K.Roy et al. (See S.K.Roy et al., Laminar Forced Convection Heat Exchangers Using Phase Change Material Emulsions, International Journal of Heat and Mass Transfer Communications: S.K.Roy, B.L.Avanic, Laminar Forced convectionheat Transfer with Phase change material emulsions, Int.Comm. HeatMass Transfer, 1997, 24 (5): 653-662) proved through experiments that the heat transfer performance of phase change materials is similar to that of phase change materials coated with mi...

Claims

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Application Information

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IPC IPC(8): C09K5/00B01J13/16C09D7/12
Inventor 王建平张兴祥张学静王学晨
Owner TIANJIN POLYTECHNIC UNIV
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