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A method of adding manganese dioxide particles to improve the thermal performance of n-octadecane/polystyrene phase change microcapsules

A phase change microcapsule, n-octadecane technology, applied in microcapsule preparations, chemical instruments and methods, heat exchange materials, etc., can solve the problems of easy agglomeration of nanoparticles and difficult to achieve adding effects, etc.

Active Publication Date: 2021-04-06
SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nanoparticles are easy to agglomerate during emulsification, and it is difficult to achieve a good addition effect. At present, there are few studies on the addition performance of metal oxides with spiny structures. Metal oxides have certain thermal conductivity, and spiny structures can increase the size of microcapsules. The cohesion between particles can improve the encapsulation efficiency of microcapsules

Method used

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  • A method of adding manganese dioxide particles to improve the thermal performance of n-octadecane/polystyrene phase change microcapsules
  • A method of adding manganese dioxide particles to improve the thermal performance of n-octadecane/polystyrene phase change microcapsules
  • A method of adding manganese dioxide particles to improve the thermal performance of n-octadecane/polystyrene phase change microcapsules

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In the examples, the mass of n-octadecane is 29.85 g, and the mass of manganese dioxide particles (self-made, tested with a Malvern 2000 laser particle size analyzer, with a particle size of about 20 μm) is 0.15 g. The amount of manganese dioxide particles added to the core material n-octadecane is 0.5%.

[0032] Use 10wt% NaOH solution to remove the polymerization inhibitor in styrene, add a small amount of anhydrous calcium chloride to dry. Dissolve 2g of dispersant polyvinylpyrrolidone in 240mL of deionized water and heat to 40°C to prepare an aqueous phase; at the same time, 29.85 g of n-octadecane and 0.15 g of MnO 2 The particles were placed in a beaker and sonicated at 30°C for 15 min to form a suspension; 30g n-octadecane / MnO 2 Suspension, 29.3mL styrene (St), 3.4mL divinylbenzene (DVB, cross-linking agent) and 0.7g azobisisobutyronitrile (AIBN, initiator) were sequentially added to the beaker and heated in an oil bath at 40°C, magnetic Stir for 20 min to make...

Embodiment 2

[0034] In the example, the mass of n-octadecane is 29.55 g, and the mass of manganese dioxide particles is 0.45 g. The amount of manganese dioxide particles added is 1.5% of the mass of the core material n-octadecane.

[0035] Use 10wt% NaOH solution to remove the polymerization inhibitor in styrene, add a small amount of anhydrous calcium chloride to dry. Dissolve 2 g of dispersant polyvinylpyrrolidone in 240 mL of deionized water and heat to 50 °C to prepare an aqueous phase; meanwhile, 29.55 g of n-octadecane and 0.45 g of MnO 2 The particles were placed in a beaker, and ultrasonicated at 40°C for 20 min to form a suspension; 30g n-octadecane / MnO2 Suspension, 29.3 mL styrene (St), 3.4 mL divinylbenzene (DVB, cross-linking agent) and 0.7 g azobisisobutyronitrile (AIBN, initiator) were added to the beaker in sequence according to the proportion and heated in an oil bath at 50 °C , magnetic stirring for 30 minutes to make the oil phase, when the temperature of the two-phase s...

Embodiment 3

[0037] In the example, the mass of n-octadecane is 29.13 g, and the mass of manganese dioxide particles is 0.87 g. The added amount of manganese dioxide particles accounted for 3.0% of the mass of the core material n-octadecane.

[0038] Use 10wt% NaOH solution to remove the polymerization inhibitor in styrene, add a small amount of anhydrous calcium chloride to dry. Dissolve 2g of dispersant polyvinylpyrrolidone in 240mL of deionized water and heat to 60°C to prepare an aqueous phase; at the same time, 29.13 g of n-octadecane and 0.87 g of MnO 2 The particles were placed in a beaker, and ultrasonicated at 50°C for 30 min to form a suspension; 30 g of n-octadecane / MnO 2 Suspension, 29.3mL styrene (St), 3.4mL divinylbenzene (DVB, crosslinking agent) and 0.7g azobisisobutyronitrile (AIBN, initiator) were added to the beaker in sequence according to the proportion and heated in an oil bath at 60°C , magnetically stirred for 40 minutes to make an oil phase, when the temperature ...

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Abstract

The invention discloses a method for improving the thermal performance of n-octadecane / polystyrene phase change microcapsules by adding manganese dioxide particles. It includes the following steps: (1) dissolving the dispersant in water, heating to 40-60°C to prepare a water phase; (2) mixing n-octadecane and MnO 2 The particles were mixed and ultrasonicated at 30-50°C to form a suspension; (3) n-octadecane / MnO 2 Stir the suspension, styrene, divinylbenzene and initiator at a temperature of 40~60°C to make an oil phase; (4) Add the oil phase to the water phase at the same temperature of the water and oil two-phase system After mixing, stir and emulsify, then increase the temperature and continue to stir; after the reaction is completed, carry out suction filtration, washing and drying while hot to obtain manganese dioxide-modified n-octadecane / polystyrene phase change microcapsules. The invention can effectively improve the encapsulation rate and thermal conductivity of n-octadecane / polystyrene phase change microcapsules by adding manganese dioxide particles.

Description

technical field [0001] The invention relates to a method for improving the thermal performance of n-octadecane / polystyrene phase change microcapsules by adding manganese dioxide particles, and belongs to the technical field of microcapsule phase change materials. Background technique [0002] In today's society, human society continues to develop and accelerate the degree of global industrialization, and the corresponding energy demand is also increasing, and global energy is increasingly exhausted. Building energy consumption accounts for a large proportion of the overall energy consumption of the society. How to reduce building energy consumption and develop new building energy-saving materials and technologies has become a research hotspot for sociologists today. Phase-change materials (PCMs) can undergo phase changes within a specific temperature range, and through phase changes accompanied by energy conversion to adjust the ambient temperature. It makes phase change ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/02C09K5/06
CPCB01J13/02C09K5/063
Inventor 王继芬张凯蔡乐
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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