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Method for preparing linear polyurethane phase change material

A phase-change energy storage material, polyurethane technology, applied in the direction of heat exchange materials, chemical instruments and methods, can solve the problems of unfavorable processing and molding, difficult processing and molding, and expensive raw materials, and achieve low cost, easy molding and processing, The effect of simple preparation method

Active Publication Date: 2014-04-23
温州东润新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is a document disclosing a prepared hyperbranched polyurethane with a phase change enthalpy of 138.2 J / g, but the raw materials used are expensive, and it is easy to form cross-linked polyurethane, which is not conducive to processing and molding
It has been reported in the literature that the prepared cross-linked polyurethane has a phase change enthalpy of 152.97 J / g, but it is not easy to process and shape

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 18g of polyethylene glycol with a number-average molecular mass of 6000 into a 500mL three-neck flask with a stirrer, raise the temperature to 110°C, start stirring and vacuum dehydration for 2 hours, then cool to 70°C, and blow in nitrogen Release the vacuum. Add 1.6g of 4,4'-diphenylmethane diisocyanate and a certain amount of solvent DMF, and react for 2 hours. Then add 0.4g N-methyldiethanolamine and react at 60°C for 2 hours, add 0.5g butane sultone and react for 2 hours, apply the polyurethane solution evenly on the release paper, leave it at room temperature for one week, and then dry it. Bake at 80°C for 10 hours in an oven.

Embodiment 2

[0025] Add 18g of polyethylene glycol with a number-average molecular mass of 6000 into a 500mL three-neck flask with a stirrer, raise the temperature to 110°C, start stirring and vacuum dehydration for 2 hours, then cool to 70°C, and blow in nitrogen Release the vacuum. Add 1.6g of 4,4'-diphenylmethane diisocyanate and a certain amount of mixed solvent DMF and butanone, and react for 2 hours. Then add 0.7g of N-phenyldiethanolamine and react at 60°C for 2 hours, then evenly coat the polyurethane solution on the release paper, leave it at room temperature for a week, and bake it in a vacuum oven at 60°C for 4 hours.

Embodiment 3

[0029]Add 18g of polyethylene glycol with a number-average molecular mass of 10,000 into a 500mL three-neck flask with a stirrer, raise the temperature to 110°C, start stirring and vacuum dehydration for 2 hours, then cool to 60°C, and blow in nitrogen Release the vacuum. Add 1.5g of 4,4'-diphenylmethane diisocyanate and a certain amount of solvent DMF to react for 4 hours. Then add 0.5g of N-methyldiethanolamine and react at 60°C for 2 hours, then add 0.3g of acetic acid and react for 2 hours, apply the polyurethane solution evenly on the release paper, and place it at room temperature for a week, then place it in a drying oven at 80°C Bake for 10 hours.

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Abstract

The invention discloses a method for preparing a linear polyurethane phase change material. The method comprises the following steps: dissolving polyethylene glycol and diisocyanate into solvent in inert atmosphere, reacting in the presence of optional catalyst, adding tertiary amine type chain extender containing hydroxyl for chain extension, adding an optional neutralizer for salt formation so as to obtain the linear polyurethane phase change material, wherein the molar ratio of the sum of hydroxyl of polyethylene glycol and hydroxyl of chain extender to the isocyanate group of diisocyanate is 1:1, the add amount of the catalyst accounts for 0-1% the total weight of the polyethylene glycol, diisocyanate and chain extender, the molar ratio of neutralizer to tertiary amine type chain extender is 0-1, and the molecular weight of the polyethylene glycol is higher than 2000. The linear polyurethane phase change material prepared by the method has a linear structure and large enthalpy of phase change, has a simple preparation method, is low in cost, has stable property, can be stored for long time, is not solidified and cross-linked, is easy to process and shape, and is beneficial to large-scale popularization and application.

Description

technical field [0001] The invention relates to a linear polyurethane phase change energy storage material and a preparation method thereof. The preparation process of the invention is simple, the phase change enthalpy is high, the raw material is cheap, and it is easy to process and shape. Background technique [0002] Energy is the basis for human survival, but there are often time and space mismatches between energy supplies, and many energy sources cannot be reasonably and fully utilized at present. Finding new energy and developing renewable energy to solve the contradiction between heat supply and demand, improve energy utilization efficiency and environmental protection are current research hotspots. Phase change materials use the thermal effect in the phase change process of matter to store and release energy, and the phase change process is a transition from solid to solid. The volume change during the phase change process is small, no liquid or gas is produced, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/32C09K5/02
CPCC08G18/0814C08G18/10C08G18/4833C09K5/02C08G18/3275
Inventor 翟兰兰陈凯刘若望邵沁怡戴伟婷叶海波蔡晓庆兰云军
Owner 温州东润新材料科技有限公司
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