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Silicon nitride-modified phase-change and energy-storage microcapsule and preparation method thereof

A phase-change energy storage and microcapsule technology, which is applied in the direction of microcapsule preparation, microsphere preparation, chemical instruments and methods, etc., can solve the problem of large difference in structure between inorganic rigid particles and organic phases, failure to achieve beneficial properties, and damage to polymers. Performance and other issues, to achieve good interface performance, property improvement, and improve the effect of temperature resistance

Active Publication Date: 2014-05-21
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high surface free energy of nano-silicon nitride, it is easy to form agglomerations. When it is added to the polymer matrix as a filler, due to the large difference in structure between the inorganic rigid particles and the organic phase, the compatibility is poor, resulting in nano-nitrogen It is difficult for silicon dioxide particles to be uniformly dispersed in the polymer matrix at the nanoscale, but it is easy to form aggregated large particles, which become defects in composite materials.
This will not only fail to achieve the above-mentioned beneficial properties, but will damage the properties of the polymer itself

Method used

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  • Silicon nitride-modified phase-change and energy-storage microcapsule and preparation method thereof
  • Silicon nitride-modified phase-change and energy-storage microcapsule and preparation method thereof
  • Silicon nitride-modified phase-change and energy-storage microcapsule and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035]1) Weigh 3g of γ-methacryloxypropyltrimethoxysilane (KH570) and add it into 10g of ethanol to make an alcoholic solution, then add 1.5g of silicon nitride powder, ultrasonicate for 15min, then soak for 48h, at 50℃ drying in an oven to obtain grafted silicon nitride powder. 2) Heat up 12g of n-octadecane to melt, while maintaining the temperature, add 0.5g of grafted silicon nitride powder obtained in step 1), 1g of styrene-maleic anhydride copolymer, stir at 600rpm for 15min, and then Sonicate for 15 minutes to form an emulsion. 3) Add the emulsion prepared in step 2) to 200g of deionized water, then add 1g of sodium lauryl sulfate and 2g of styrene-maleic anhydride copolymer, and stir at 6000rpm for 10min with a high-speed shear emulsifier . 4) Add 1g of the grafted silicon nitride powder obtained in step 1), 3g of pentaerythritol tetraacrylate, and 0.3g of azobisisobutylcyanide into 10g of methyl methacrylate, and use a high-speed shear emulsifier at 6000rpm Stir fo...

Embodiment 2

[0037] 1) Weigh 3g of γ-(2,3-epoxypropoxy)propyltrimethoxysilane (KH560) and add it into 30g of methanol to prepare an alcohol solution, then add 2g of silicon nitride powder, ultrasonicate for 10min, and then soak After 10 hours, dry in an oven at 50°C to obtain grafted silicon nitride powder. 2) Warm up 50g of n-butyl stearate to melt, while maintaining the temperature, add 1g of grafted silicon nitride powder obtained in step 1), 1g of styrene-maleic anhydride copolymer, stir at 600rpm for 10min, then Sonicate for 15 minutes to form an emulsion. 3) Add the emulsion prepared in step 2) to 500g of deionized water, add 1g of sodium lauryl sulfate, 2g of styrene-maleic anhydride copolymer, and stir for 5min at 5000rpm with a high-speed shear emulsifier . 4) Add 1g of the grafted silicon nitride powder obtained in step 1), 1g of pentaerythritol tetraacrylate, and 0.1g of azobisisobutylcyanide to 50g of methyl methacrylate, and use a high-speed homogenizer at a speed of 6000rpm...

Embodiment 3

[0039] 1) Weigh 30g of γ-methacryloxypropyltrimethoxysilane (KH570) and add it into 100g of ethanol to make an alcohol solution, then add 15g of silicon nitride powder, ultrasonically treat for 40min, then soak for 60h, and dry naturally at room temperature. The grafted silicon nitride powder was obtained. 2), heat up 70g of n-butyl stearate to melt, while maintaining the temperature, add 5g of grafted silicon nitride powder obtained in step 1), 1g of styrene-maleic anhydride copolymer, stir at 800rpm for 20min, then Ultrasonic treatment for 50 minutes was performed to form an emulsion. 3) Add the emulsion prepared in step 2) to 800g of deionized water, add 2g of sodium lauryl sulfate, 10g of styrene-maleic anhydride copolymer, and stir for 20min at 10,000rpm with a high-speed shear emulsifier . 4) Add 10g of the grafted silicon nitride powder obtained in step 1), 10g of divinylbenzene, and 4g of azobisisobutylcyanide to 50g of methyl methacrylate, and use a high-speed shear...

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Abstract

The invention discloses a silicon nitride-modified phase-change and energy-storage microcapsule, comprising a shell material and a cladded core material, wherein the shell material comprises the following raw materials in parts by weight: 50-100 parts of high-molecular polymers and 1-20 parts of silicon nitride powder which is evenly dispersed into the high-molecular polymers; the core material comprises 50-100 parts of organic phase-change and energy-storage materials and 1-20 parts of silicon nitride powder which is evenly dispersed into the organic phase-change and energy-storage materials. The invention also provides a preparation method of the phase-change energy-storage microcapsule. The thermal conductivity of the phase-change and energy-storage material is improved, overheat and overcold degrees in the phase-change process are inhibited, and meanwhile, the thermal endurance and the abrasive resistance, the thermal shock resistance, the fatigue resistance and the like also are improved. The silicon nitride-modified phase-change and energy-storage microcapsule is relatively simple in preparation technology, available in raw materials, strong in controllability, and applicable to the industrial large-scale production, an existing industrial processing technology can be fully utilized, and the performance of the phase-change and energy-storage microcapsule is improved.

Description

technical field [0001] The invention relates to a phase change energy storage microcapsule and a preparation method thereof, in particular to a silicon nitride modified phase change energy storage microcapsule and a preparation method thereof. Background technique [0002] In today's increasingly prominent energy and environmental issues, phase change energy storage materials (PCMs) with high energy storage density and long cycle life have attracted more and more attention. The research on phase change energy storage microcapsules (MicroPCMs) overcomes a series of problems in the application of PCMs, such as: high fluidity of liquid, easy leakage during phase change, poor compatibility with matrix materials, and low strength of microcapsules , poor thermal conductivity, etc. The application of MicroPCMs has covered various fields such as aerospace, energy-saving buildings, temperature-regulating fibers, battery management, and factory waste heat recovery, and is closely rel...

Claims

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Application Information

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IPC IPC(8): C09K5/06B01J13/16
Inventor 唐国翌杨艳阳宋国林刘源
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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