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Water-based phase-change microcapsule film and preparation method thereof

A phase change microcapsule and microcapsule technology, applied in chemical instruments and methods, heat exchange materials, etc., can solve the problem of poor film strength and weather resistance, weak phase change heat absorption and exothermic ability, and cannot be applied to industrial production, etc. problems, to achieve excellent thermal conductivity and thermal stability, suitable for large-scale production, simple and environmentally friendly production process

Inactive Publication Date: 2019-10-15
杭州英诺克新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor film-forming property of the raw material, the size and thickness of the prepared film material are difficult to control and uneven, so this invention cannot be applied to industrial production; at the same time, the enthalpy value of the film is low, and the heat absorption and release capacity of the phase change is not strong. ; In addition, the film strength and weather resistance are not good, and the practical application is greatly restricted

Method used

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  • Water-based phase-change microcapsule film and preparation method thereof
  • Water-based phase-change microcapsule film and preparation method thereof
  • Water-based phase-change microcapsule film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0038] Weigh the paraffin in a beaker, heat and melt it in a constant temperature oven to a transparent liquid state, then add an appropriate amount of film material into the molten paraffin and stir to dissolve to form an oil phase; in another beaker, dissolve the emulsifier in ionized water to form a water phase. The oil phase and the water phase are then mixed, and a milky white O / W type emulsion is obtained by shearing. The phase change microcapsules are obtained by adding a crosslinking agent or an initiator to crosslink the film material to form a film.

[0039] After testing, the particle size of the obtained microcapsules is D50=20um, and the energy storage value of the obtained microcapsules is 217 J / g. According to the TGA experiment of thermogravimetric analysis, it has no obvious thermal weight loss before 250°C, and has good thermal stability.

Embodiment 1

[0041] Add 30g phase change microcapsule water dispersion slurry (solid content 36%) and 1g flame retardant to 6g adhesive (solid content about 50%), stir to make the phase change microcapsule evenly dispersed in the water phase; then add 0.15g of defoamer was stirred, and 0.15g of acrylate thickener was slowly added at the same time, and the stirring was continued for a period of time to obtain a uniform aqueous phase change microcapsule dispersion.

[0042] The aqueous phase change microcapsule dispersion liquid is uniformly coated into a film, dried in an oven, and cured to form an aqueous phase change microcapsule film.

[0043] After testing, the obtained milky white aqueous phase change microcapsule film has a thickness of 0.5 mm and a latent heat enthalpy of about 151 J / g. The flame retardant grade reaches UL-94HB grade.

Embodiment 2

[0045]Add 12g phase change microcapsule aqueous dispersion slurry (solid content 36%) and 0.7g flame retardant to 6g binder (solid content 50%), shake to fully wet the powder, stir to make the phase change microcapsules Disperse uniformly in the water phase; then add 0.1g defoamer, stir, and slowly add 0.1g carboxymethyl cellulose thickener at the same time, continue stirring for a period of time to obtain a uniform aqueous phase change microcapsule dispersion.

[0046] The aqueous phase change microcapsule dispersion liquid is uniformly coated into a film, dried in an oven, and cured to form an aqueous phase change microcapsule film.

[0047] After testing, the obtained milky white aqueous phase change microcapsule film has a thickness of 0.4 mm and a latent heat enthalpy of about 122 J / g. The flame retardant grade reaches UL-94HB grade.

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Abstract

The invention provides a water-based phase-change microcapsule film and a preparation method thereof. The phase-change microcapsule film comprises the following components by mass: 3-60% of an adhesive, 40-95% of phase-change microcapsules, 0-1% of a defoaming agent, 0.1-5% of a thickening agent, 4-20% of a flame retardant, 0-20% of a high-thermal-conductivity carbon material and the balance of water. The phase change microcapsule film is high in enthalpy value, excellent in energy storage performance and good in heat conductivity and heat stability. The film is adjustable in shape, size and thickness, high in strength, good in flexibility, resistant to bending, simple in production mode, environmentally friendly, suitable for large-scale industrial production and wide in application range.

Description

technical field [0001] The invention relates to the technical field of phase change materials, and more particularly, to an aqueous phase change microcapsule film and a preparation method thereof. Background technique [0002] The increasing shortage of global energy makes the development and research of energy saving and energy storage technology one of the important means to improve energy utilization. With the improvement of the degree of integration of electronic circuits, electronic components are becoming more and more miniaturized and high-power, which makes the heat density of various electronic components higher and higher. Excessive temperature will reduce the efficiency and life of the equipment, and even cause safety accidents such as burning or explosion. Phase change energy storage technology is an important means to solve the contradiction between energy supply and demand in time and space by utilizing the characteristics of phase change materials that can ab...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 焦国泰刘宏伟陈蕾
Owner 杭州英诺克新材料有限公司
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