Room-temperature solid-solid phase change material for thermal energy storage and preparation method of room-temperature solid-solid phase change material

A technology of thermal energy storage and phase change materials, which is applied in the field of composite materials, can solve problems such as the influence of phase change enthalpy, the decline of crystallization ability, and the restriction of chain segment movement, and achieve the effect of low implementation cost and increased phase change enthalpy

Active Publication Date: 2019-10-25
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, solvent-based polyurethane is gradually replaced by water-based polyurethane due to the environmental hazards caused by the use of a large amount of organic solvents, and due to the fixing effect of its chemical bonds, the phase change unit is restricted in the polymer structure, resulting in phase change at the phase change temperature point. The chain segment movement of the variable unit is restricted, the crystallization ability is reduced, and its phase change enthalpy is greatly affected

Method used

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  • Room-temperature solid-solid phase change material for thermal energy storage and preparation method of room-temperature solid-solid phase change material
  • Room-temperature solid-solid phase change material for thermal energy storage and preparation method of room-temperature solid-solid phase change material
  • Room-temperature solid-solid phase change material for thermal energy storage and preparation method of room-temperature solid-solid phase change material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Preparation of polyurethane dispersion

[0047] 5g (0.0025moL) polyether 220 (M n=2000) was vacuum-dried at 120°C for 4 hours by a circulating water pump, then lowered to 50°C, added 2.5g of diphenylmethane diisocyanate (0.01moL), reacted for 2h, then added 0.335g (0.0025moL) and dried in a vacuum oven at 80°C for 2h Dimethylolpropionic acid and 3 drops of dibutyltin dilaurate, heated to 75°C for 2 hours, cooled to 50°C, added 1.589g (0,012moL) hydroxyethyl methacrylate and 3 drops of dibutyltin dilaurate , and reacted for 2 hours to obtain a polyurethane prepolymer. During the process, due to the increase in viscosity, a total of 5g of acetone solution was added; when it was lowered to room temperature, 0.2525g of triethylamine was added for neutralization for 10min, and then 22g of deionized water was added to self-emulsify to obtain a double bond-containing Polyurethane dispersion;

[0048] (2) Preparation of polyurethane-acrylate emulsion

[0049] Take the ab...

Embodiment 2

[0053] (1) Preparation of polyurethane dispersion

[0054] 5g (0.005moL) polyether 220 (M n =2000) was vacuum-dried at 120°C for 4 hours by a circulating water pump, cooled to 50°C, added 2.5g of diphenyl diisocyanate (0.02moL), reacted for 2h, then added 0.82g (0.006moL) and dried in a vacuum oven at 80°C for 2h Dimethylolpropionic acid and 3 drops of dibutyltin dilaurate, react for 2h, add 2.918g hydroxyethyl methacrylate (0.022moL) and 3 drops of dibutyltin dilaurate, react for 2h, and obtain polyurethane prepolymer, process Due to the increase in viscosity, add a total of 5g of acetone solution; drop to room temperature and add 0.2525g of triethylamine to neutralize for 10min, then add 43g of deionized water to self-emulsify to obtain a polyurethane dispersion;

[0055] (2) Preparation of polyurethane-acrylate emulsion

[0056] Take the above polyurethane dispersion in a three-necked flask, add 1.25g methyl methacrylate (MMA), 0.625g butyl methacrylate (BMA), stir at a l...

Embodiment 3

[0060] (1) Preparation of polyurethane dispersion

[0061] 5g (0.0025moL) of polyether 220 and 0.335g (0.0025moL) of dimethylol propionic acid were dried in vacuum at 120°C for 4 hours, then lowered to 90°C, and 2.2g of isophorone diisocyanate (0.01moL) and 3 drops of diisocyanate were added. Dibutyltin laurate, react for 4h, cool down to 50°C, add 1.589g hydroxyethyl methacrylate (0.012moL) and 3 drops of dibutyltin dilaurate, react for 2h, and obtain polyurethane prepolymer, the viscosity increases during the process , add a total of 5g of toluene solution; drop to room temperature and add 0.2525g of triethylamine to neutralize for 10min, then add 22g of deionized water to self-emulsify to obtain a polyurethane dispersion;

[0062] (2) Preparation of polyurethane-acrylate emulsion

[0063] Take the above polyurethane dispersion in a three-necked flask, add 1.25g methyl methacrylate (MMA), 0.625g butyl methacrylate (BMA), stir at a low speed for 30min, then add 0.027g of AIB...

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Abstract

The invention provides a room-temperature solid-solid phase change material for thermal energy storage and a preparation method of the room-temperature solid-solid phase change material. The preparation method comprises the steps: preparing double-bond-modified waterborne polyurethane firstly, then performing radical copolymerization on the double-bond-modified waterborne polyurethane with an acrylic monomer, and then mixing a phase-change monomer with the obtained emulsion by using a solution mixing method so as to obtain the room temperature solid-solid phase change material for heat energystorage. The room-temperature solid-solid phase change material for heat energy storage can be applied to clothes warming and building insulation and freeze protection, has the advantages of a simpleeasily-controllable reaction process, no monomer residual, no application of emulsifiers and environmental friendliness.

Description

technical field [0001] The invention relates to a solid-solid phase change material used for thermal energy storage at room temperature and a preparation method thereof, belonging to the field of composite materials. Background technique [0002] With the change of the times, the advancement of science and technology, the development of human beings is increasingly constrained by energy, and the development of renewable energy has become the goal of researchers. Phase change energy storage materials (herein referred to as PCM, hereinafter replaced by PCM) are very good Meet people's demand for energy. PCM refers to a material that absorbs or releases energy by changing its state of matter with temperature changes. According to the phase change form, it is mainly divided into solid-solid PCM, solid-liquid PCM, solid-gas PCM, and liquid-gas PCM. According to the phase change temperature, it can be divided into low-temperature PCM, room temperature PCM, and high-temperature PC...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/00C08F220/14C08F220/18C08G18/34C08G18/48C08G18/66C08G18/67C08G18/32C09K5/02
CPCC08F283/008C08G18/4825C08G18/348C08G18/6692C08G18/672C08G18/3206C09K5/02C08F220/14
Inventor 姜彦林兴李建平蒋鲸喆陈玉瑛房子昂
Owner CHANGZHOU UNIV
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