Double-coated paraffin microcapsule phase change material and preparation method thereof

A technology of paraffin microcapsules and phase change materials, applied in heat exchange materials, chemical instruments and methods, etc., can solve problems such as single wall material, and achieve the effects of prolonging service life, improving strength and excellent weather resistance.

Inactive Publication Date: 2017-02-22
NANTONG JUREN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the wall material of the paraffin microcapsule phase change material is single at present, the invention discloses a double-wrapped paraff

Method used

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  • Double-coated paraffin microcapsule phase change material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] Example 1.

[0023] Step 1: Add 10 parts of No. 58 fully refined paraffin into the stirred tank, raise the temperature to 65°C; add 0.2 part of cetyltrimethylammonium bromide, 0.5 part of Span-60 and 0.5 part of Tween-60 , mixed evenly, and then slowly added 80 parts of deionized water; stirred at a stirring speed of 1500 r / min for 0.5 h to obtain an O / W type paraffin wax emulsion.

[0024] Step 2: Take 20 parts of the paraffin wax emulsion prepared in step 1, add 0.02 part of ammonium persulfate and 0.2 part of 0.5% lithium magnesium silicate solution, raise the temperature to 70°C, stir until the two dissolve, and then slowly add acrylic acid dropwise 5 parts of butyl ester and 2 parts of methyl methacrylate were dripped within 1 h, and then the reaction was incubated for 1 h.

[0025] Step 3: After the completion of step 2, add 0.02 part of ammonium persulfate, then slowly dropwise add 5 parts of methyl methacrylate, 2 parts of butyl acrylate and 1 part of acrylic a...

Example Embodiment

[0027] Example 2.

[0028] Step 1: Add 15 parts of RUBITHERM (34°C) to the stirring tank, raise the temperature to 70°C; add 0.5 part of dodecyl ammonium chloride, 0.5 part of Span-60 and 0.5 part of OP-10, mix well, Then slowly add 120 parts of deionized water; stir at a stirring speed of 1500r / min for 0.5h to obtain an O / W type paraffin wax emulsion.

[0029] Step 2: Take 30 parts of the paraffin wax emulsion prepared in step 1, add 0.04 part of ammonium sulfate and 0.4 part of 0.5% lithium magnesium silicate solution, raise the temperature to 70°C, stir until the two dissolve and start to slowly dropwise add isoacrylic acid. 8 parts of octyl ester and 3 parts of methyl methacrylate were dripped within 1 hour, and then the reaction was incubated for 1 hour.

[0030] Step 3: After the completion of step 2, add 0.04 part of ammonium persulfate, then slowly dropwise add 6 parts of epoxy acrylate, 2 parts of isooctyl acrylate and 2 parts of acrylic acid, the dripping is complet...

Example Embodiment

[0032] Example 3.

[0033] Step 1: Add 20 parts of RUBITHERM (44°C) to the stirred tank, raise the temperature to 70°C; add 1 part of cetylpyridinium bromide, 1 part of Span-80 and 1 part of OP-10, mix well, Then slowly add 160 parts of deionized water; stir at 3000r / min stirring speed for 0.5h to obtain O / W type paraffin wax emulsion.

[0034] Step 2: Take 45 parts of the paraffin wax emulsion prepared in step 1, add 0.05 part of potassium persulfate, 0.3 part of ethylene glycol and 0.2 part of propylene glycol, raise the temperature to 70°C, stir until the two dissolve, and then slowly add acrylic acid dropwise 10 parts of isooctyl ester and 3 parts of methyl methacrylate were dripped within 1 h, and then the reaction was incubated for 1 h.

[0035] Step 3: After the completion of step 2, 0.05 part of potassium persulfate was added, and then 10 parts of epoxy acrylate, 3 parts of isooctyl acrylate, 2 parts of acrylic acid and 1 part of hydroxyethyl acrylate were slowly adde...

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Abstract

The invention discloses a double-coated paraffin microcapsule phase change material and a preparation method thereof. The composite microcapsule is made of paraffin wax as a core material. The coated wall layer of the paraffin microcapsule has two shell structures with different hardness, and is made by the following preparation method. The preparation method includes first, obtaining high stability of the paraffin emulsion through the complex emulsifier; and then through a method of several times of core-shell emulsion polymerization, coating two flexible/hard acrylate layers (hardness of two layers of coating can be adjusted based on actual needs) on the surface of the paraffin emulsion, and then obtaining the double-coated paraffin microcapsule phase change material through the demulsification, suction filtration, and microwave drying. The coated wall layer of the double-coated paraffin microcapsule disclosed in the invention has excellent weathering resistance, heat resistance and anti-blocking property, which solve the problem of poor flexibility, heat resistance and freeze-thaw resistance of microcapsules, and further, strength, toughness and stability of the product are improved, service life is prolonged, and the production process is simple, with good market prospects.

Description

technical field [0001] The invention belongs to the field of phase-change energy storage materials, in particular to a double-wrapped paraffin microcapsule phase-change material and a preparation method thereof. Background technique [0002] In recent years, phase-change energy storage-energy-discharging materials (PCMs) are gradually being widely used in many fields such as building energy conservation and thermal insulation materials. Microencapsulated phase change materials (MicroPCMs) use microcapsule technology to coat phase change materials to form particulate composite phase change materials with a size of 1 μm to 1000 μm. Microcapsule phase change materials can effectively solve the leakage problem of energy storage-energy release materials, prevent the reaction of phase change materials with the surrounding environment, improve the use efficiency of phase change materials, and increase the heat transfer surface area. Widespread attention from domestic and foreign e...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 陆洪彬
Owner NANTONG JUREN NEW MATERIAL TECH
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