Method for preparing microcapsule phase change material by using composite emulsifier

A composite emulsifier and phase change material technology, applied in microcapsule preparations, chemical instruments and methods, microsphere preparation, etc., can solve the problems of polluted environment, uneven dispersion, volume change, etc., and achieve high encapsulation rate, particle size Evenly distributed, smooth surface effect

Inactive Publication Date: 2013-06-26
DALIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, a single phase change material has some defects, such as the solid-liquid phase change material has fluidity when it is in a liquid state when it is directly used in practice, the volume will change during the phase change, and it will be polluted when it becomes liquid after the phase change. environment, uneven dispersion during use, etc.

Method used

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  • Method for preparing microcapsule phase change material by using composite emulsifier
  • Method for preparing microcapsule phase change material by using composite emulsifier
  • Method for preparing microcapsule phase change material by using composite emulsifier

Examples

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preparation example Construction

[0023] One, the preparation of melamine-formaldehyde prepolymer

[0024] Put a certain amount of melamine, formaldehyde aqueous solution (37-40wt%) and deionized water into a 150mL three-necked flask, adjust the pH value of the mixed solution to 8.5-9.0 with 10% triethanolamine, and stir in a constant temperature water bath at 70°C React until the mixed solution is completely transparent to obtain a prepolymer solution, which is set aside.

[0025] 2. Preparation of oil-in-water emulsion

[0026] Uniformly disperse the oil phase monomer in the water phase to form an oil-in-water (o / w) emulsion, the shear speed is 1500-3000rpm, and the amount of compound emulsifier is 5-15% of the core material content, emulsifying the oil-water of paraffin The ratio is 1:3-1:10. Specific steps:

[0027] (1) Add a certain amount of distilled water (the ratio of oil to water is 1:3-1:10) and Tween 20 (Tween 20 accounts for 66% of the total mass of the emulsifier) ​​into a 300mL beaker with a ...

Embodiment 1

[0037] One, the preparation of melamine-formaldehyde prepolymer

[0038] Put 2.92g of melamine, 5.8mL of formaldehyde solution (37-40wt%) and 20mL of deionized water into a 150mL three-necked flask, and adjust the pH value of the mixed solution to 8.5-9.0 with 10wt% triethanolamine (about 5-6 drops) , put it in a constant temperature water bath at 70°C and stir until the mixed solution is completely transparent, and keep it warm for 30 minutes to obtain a prepolymer solution, which is ready for use

[0039] 2. Preparation of oil-in-water emulsion

[0040] (1) Add 50mL of distilled water and 0.66g of Tween 20 into a 300mL beaker with a thermometer and mechanical stirring, heat the water bath to 50°C, and stir at 500r / min for 15 minutes to prepare an emulsifier aqueous solution.

[0041] (2) Slowly add the mixed solution of 10g phase-change paraffin and 0.34g Span 80 into the emulsified aqueous solution, keep the temperature of the water bath at 50°C, increase the speed to 3000...

Embodiment 2

[0045] One, the preparation of melamine-formaldehyde prepolymer: with embodiment 1.

[0046] 2. Preparation of oil-in-water emulsion

[0047] (1) Add 50mL of distilled water and 0.33g of Tween 20 into a 300ml beaker with a thermometer and mechanical stirring, heat in a water bath to 50°C, and stir at 500r / min for 15 minutes to prepare an aqueous emulsifier solution.

[0048] (2) Slowly add the mixed solution of 10g phase-change paraffin and 0.17g Span 80 into the emulsified aqueous solution, keep the temperature of the water bath at 50°C, increase the speed to 3000r / min, and stir rapidly for 30min to obtain a stable oil-in-water (o / w) lotion.

[0049] Three, microencapsulation process: with embodiment 1.

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Abstract

The invention discloses a method for preparing a microcapsule phase change material by using a composite emulsifier, which is used for preparing a microcapsule phase change material by using an in-situ polymerization method with paraffin as the core material and melamine-formaldehyde resin as the wall material. According to the method, firstly an oil-in-water (o / w) latex is prepared under the certain rotation speed with tween-20 and span-80 as the composite emulsifier, then melamine-formaldehyde prepolymer solution is added into the latex, the prepolymer gradually swells and deposits on the surface of the core material, a solid capsule shell is finally formed due to continuous cross linking and polymerization, and the encapsulated-completely phase change material microcapsule is obtained. The microcapsule phase change material prepared according to the method has the particle size of 3-4 mum, and has regular surface morphology, high encapsulation rate and good permeability resistance, and the method is simple and applied to the fields of building energy storage, textile and clothing, military affairs and the like.

Description

technical field [0001] The invention belongs to a functional heat storage microcapsule phase-change microcapsule and a preparation method thereof. The obtained microcapsule phase-change material can be directly applied to the field of textiles, construction, military affairs and the like. Background technique [0002] Phase change materials (phase change materials) are materials that use phase change latent heat to absorb, store and release heat energy. The heat absorbed and released during the phase change process is called phase change latent heat, while its own temperature remains unchanged. It can be widely used in the fields of energy storage and temperature control, and has developed rapidly in European and American countries in the past 20 years. However, in practical applications, a single phase change material has some defects, such as the solid-liquid phase change material has fluidity when it is in a liquid state when it is directly used in practice, the volume wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/18C09K5/06
Inventor 詹世平周智轶陈理
Owner DALIAN UNIV
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