Method of preparing solid-solid phase change material through grafting copolymerization

A phase-change material and phase-change material technology, applied in the field of functional materials, can solve problems such as leakage, and achieve the effects of wide application range, improved heat resistance and processing function, and improved heat resistance and processing function

Pending Publication Date: 2018-01-19
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method grafts and copolymerizes phase change materials on the surface of porous nanopowders, and uses the interaction force between molecules to solve the problem of leakage and precipitation during application.

Method used

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  • Method of preparing solid-solid phase change material through grafting copolymerization
  • Method of preparing solid-solid phase change material through grafting copolymerization
  • Method of preparing solid-solid phase change material through grafting copolymerization

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Dry the porous silicon dioxide raw material, and then ultrasonically disperse it into acetic acid for acid treatment, and dry it before use; use silica gel to dry PEG-6000 before use. Take 60g of acid-treated porous silica and add it to a three-necked flask filled with 200ml of distilled water, stir and disperse evenly, heat the dried PEG-6000 to a molten state, and pour it into the three-necked flask at a stirring speed of 1000r / min Add 30g of molten PEG-6000 dropwise while stirring, continue stirring for 0.5h, then add 5g of toluene diisocyanate and 0.2g of stannous octoate, and then place the three-necked flask in a constant temperature water bath equipped with a condenser tube and a stirrer. The temperature of the constant temperature water bath was controlled to 70° C., and the reaction was carried out under reflux for 2 hours to obtain a crude product. Centrifuge the crude product with a centrifuge, control the speed of the centrifuge to 6000r / min, and the centrif...

Embodiment 2

[0036] The porous silicon dioxide raw material is dried, then ultrasonically dispersed in acetic acid for acid treatment, and then dried for use; the PEG-1000 is dried for use after being dried with silica gel. Take 70g of acid-treated porous silica and add it to a three-necked flask filled with 200ml of distilled water, stir and disperse evenly, heat the dried PEG-1000 to a molten state, and pour it into the three-necked flask at a stirring speed of 500r / min Add 40g of molten PEG-1000 dropwise while stirring, continue stirring for 0.5h, then add 7.5g of diphenylmethane diisocyanate and 0.5g of dibutyltin maleate, and then place the three-necked flask with a condenser In a constant temperature water bath with a stirrer, the temperature of the constant temperature water bath is controlled to be 70° C., and the reaction is carried out under reflux for 2 hours to obtain a crude product. Centrifuge the crude product with a centrifuge, control the speed of the centrifuge to 5000r / m...

Embodiment 3

[0038]The raw material of porous carbon nanotubes is dried, then ultrasonically dispersed in acetic acid for acid treatment, and then dried for use; PEG-2000 is dried with silica gel for use before use. Take 80g of acid-treated porous carbon nanotubes and add them to a three-necked flask filled with 200ml of distilled water, stir and disperse evenly, heat the dried PEG-2000 to a molten state, and pour it into the three-necked flask at a stirring speed of 1000r / min Add 50g of molten PEG-2000 dropwise while stirring, continue stirring for 0.5h, then add 10g of diphenylmethane diisocyanate and 1g of dibutyltin maleate, then place a three-necked flask equipped with a condenser and stir In the constant temperature water bath of the device, the temperature of the constant temperature water bath was controlled to be 70° C., and the reaction was carried out under reflux for 2 hours to obtain the crude product. Centrifuge the crude product with a centrifuge, control the speed of the ce...

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Abstract

The invention discloses a method of preparing a solid-solid phase change material through grafting copolymerization and belongs to the technical field of functional materials. The method comprises thesteps of: 1) pretreatment of raw materials; 2) complete reaction; 3) post-treatment of a crude product. The method preferably including the steps of: treating the surface of porous nano-powder with acid to graft carboxyl groups on the surface of porous nano-powder; performing esterification reaction to the carboxyl groups with hydroxyl groups on a phase-change material, PEG, so as to graft a polyethylene glycol chain terminal onto the framework macromolecules, which have high melting point, high strength and stable structure. Due to the high melting point of the framework macromolecules, macroscopic flowing of the polyethylene glycol is limited, so that solid stage during phase change is guaranteed. The material is free of problems such as separation out, leakage and the like during application.

Description

technical field [0001] The invention relates to phase change materials, which belong to the technical field of functional materials, and in particular to a method for preparing solid-solid phase change materials by graft copolymerization. Background technique [0002] Polyethylene glycol (PEG) is widely used in the preparation of functional composite phase transitions due to its excellent properties such as suitable phase transition temperature, high latent heat capacity, small volume change during solid-liquid phase transition, and excellent heat resistance. Material. However, PEG- is a solid-liquid phase change material, so it must be sealed to prevent liquid leakage after melting. In order to overcome the liquid phase of PEG during the phase change process, the preparation of new solid-solid phase change materials is one of the current research priorities. [0003] Chinese invention patent application (application publication number: CN104910334A, application publicatio...

Claims

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Application Information

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IPC IPC(8): C08G18/48C08K7/26C08K9/04C08K7/24C09K5/02D01F6/92D01F1/10
Inventor 赵青华牛应买王栋梅涛毛秦岑罗宇郭启浩
Owner WUHAN TEXTILE UNIV
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