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A preparation method for secondary coating of low-temperature phase-change microcapsules

A low-temperature phase change, secondary packaging technology, applied in microcapsule preparation, microsphere preparation, chemical instruments and methods, etc., can solve the problems of reducing mechanical strength, core material leakage, particle adhesion, etc., to achieve dense shell, wall Effects of increased thickness, heat resistance and mechanical properties

Active Publication Date: 2015-12-09
XINHUASHENG ENERGY SAVING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a preparation method for secondary coating of low-temperature phase change microcapsules, which overcomes the adhesion between particles caused by incomplete coating of microcapsule particles in the current phase change microcapsule primary coating preparation method. Material leakage, reduce heat resistance, reduce the lack of mechanical strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Prepare the core material solution: weigh out 4.00 kg of stearic acid, 8.00 kg of 46# paraffin, and 8.00 kg of liquid paraffin, and stir in a water bath at 50°C to a transparent molten mixed state;

[0023] (2) Prepare the surfactant aqueous solution: weigh 8.00 kg of sodium polyacrylate, polystyrene sulfonate, styrene-maleic anhydride copolymer mixture and 210.00 kg of deionized water, stir and mix;

[0024] (3) Prepare oil-soluble monomer solution: weigh 0.80 kg of hydroxypropyl methacrylate, divinylbenzene, N-methylol acrylamide, 0.40 kg dibenzoyl peroxide and 7.40 kg methacrylic acid Methyl ester, stir until the dibenzoyl peroxide melts;

[0025] (4) Preparation of dispersion emulsion: set the temperature of the reaction kettle to 50℃ and keep it constant, add the surfactant aqueous solution to the reaction kettle and stir at a stirring speed of 300r / min, and then add the prepared core materials separately For solution and oil-soluble monomer solution, increase the sp...

Embodiment 2

[0029] (1) Prepare the core material solution: weigh out 4.50 kg of stearic acid, 9.00 kg of 46# paraffin, and 9.00 kg of liquid paraffin, and stir in a water bath at 55°C to a transparent molten mixed state;

[0030] (2) Prepare a surfactant aqueous solution: Weigh 9.00 kg of ethylene oxide-propylene oxide block copolymer, polyoxyethylene styrene phenol, polyvinyl alcohol mixture and 190.00 kg of deionized water, stir and mix;

[0031] (3) Prepare oil-soluble monomer solution: Weigh 0.80kg of acrylic acid, hydroxyethyl acrylate, hydroxypropyl acrylate, 0.40kg of dibenzoyl peroxide and 7.60kg of methyl methacrylate, and stir to Benzoyl melt

[0032] (4) Preparation of dispersion emulsion: set the temperature of the reaction kettle to 50℃ and keep it constant, add the surfactant aqueous solution to the reaction kettle and stir at a stirring speed of 300r / min, and then add the prepared core materials separately For solution and oil-soluble monomer solution, increase the speed to 2000r...

Embodiment 3

[0036] (1) Prepare the core material solution: weigh out 5.00 kg of stearic acid, 10.00 kg of 46# paraffin, and 10.00 kg of liquid paraffin, and stir to a transparent molten mixed state in a water bath at 55°C;

[0037] (2) Prepare the surfactant aqueous solution: weigh 10.00kg of polyvinyl lactam, polyacrylamide, polyvinylpyrrolidone mixture and 210.00kg deionized water, stir and mix;

[0038] (3) Prepare oil-soluble monomer solution: weigh out 0.90 kg of a mixture of methacrylic acid and hydroxyethyl methacrylate, 0.50 kg of dibenzoyl peroxide and 7.80 kg of methyl methacrylate, and stir until diphenyl peroxide Formyl melt

[0039] (4) Preparation of dispersion emulsion: set the temperature of the reaction kettle to 50℃ and keep it constant, add the surfactant aqueous solution to the reaction kettle and stir at a stirring speed of 300r / min, and then add the prepared core materials separately For solution and oil-soluble monomer solution, increase the speed to 2000r / min, emulsify f...

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PUM

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Abstract

The invention discloses a preparation method for twice coating of a low-temperature phase change microcapsule. The preparation method for twice coating of the low-temperature phase change microcapsule comprises the following steps: preparing a core material solution, namely taking 20-25 parts by weight of low-temperature phase change core material for water bath at 50-55 DEG C; preparing a surfactant aqueous solution, namely stirring and mixing 8-10 parts by weight of a macromolecular surfactant and 190-210 parts by weight of deionized water; preparing an oil-soluble monomer solution, namely stirring 0.4-0.5 part by weight of an oil soluble initiator, 0.8-0.9 part by weight of a cross-linking agent and 7.4-7.8 parts by weight of methyl methacrylate; adding the surfactant aqueous solution into a reaction kettle with the temperature of 50 DEG C, stirring at a speed of 300r / min, adding the core material solution and the oil-soluble monomer solution, increasing the rotation speed to 2,000r / min, emulsifying for 15 minutes, and reducing the rotation speed to 450r / min; dropwise adding 3.7-3.9 parts by weight of methacrylic acid under the reflux condensation condition, and subsequently increasing the temperature to 75 DEG C; and dropwise adding 0.30-0.35 part by weight of the water soluble initiator, 5-8 parts by weight of methyl methacrylate and 0.5-0.7 part by weight of the cross-linking agent, reacting at the constant temperature for 5-6 hours, cooling after the reaction is completed, washing with deionized water for 2-3 times, carrying out vacuum suction filtration so as to obtain the low-temperature phase change microcapsule. According to the invention, the wall thickness of the low-temperature phase change microcapsule is increased; the shell is compact; the heat resistance property and the mechanical property are improved.

Description

Technical field [0001] The invention relates to a preparation method for secondary coating of low-temperature phase change microcapsules, and belongs to the technical field of new environmentally friendly phase change energy storage. Background technique [0002] Because phase change materials can absorb or release a large amount of latent heat during the phase change process, they have broad application prospects in the fields of heat storage and temperature regulation, textiles, building energy conservation, and solar energy utilization. Phase change microcapsule technology is a technology that uses film-forming materials to coat phase change materials to form particles with a core-shell structure. The microencapsulation of phase change materials solves the shortcomings of large phase change volume changes, difficult storage, slow heat transfer rate, and easy leakage during the process of using phase change materials alone, so as to play the role of protection and barrier. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/02C09K5/06
Inventor 孙美娟刘海锋钟勤程峰唐安邦
Owner XINHUASHENG ENERGY SAVING TECH CO LTD
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