Preparation method of polyurethane solid-solid phase-change material with high enthalpy of phase change

A technology of phase change materials and polyurethane, which is applied in the field of phase change energy storage materials and its preparation, can solve the problems of long preparation process, difficulty in obtaining raw materials, and restrictions on the promotion and application of polyurethane solid-solid phase change materials, and achieves a simple and convenient preparation method Easy-to-control, easy-to-achieve effects

Inactive Publication Date: 2013-06-19
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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AI Technical Summary

Problems solved by technology

[0005] The phase change enthalpy of polyurethane solid-solid phase change materials prepared by the above method is relatively high, but either part of the raw materials used are difficult to obtain, or the preparation process is long, And the preparation needs to use a large amount of large organic solvents, and the solvents used are difficult to completely remove
For example, the hyperbranched polyester used by Qi Cao is very expensive; the preparation method of the tetrahydroxy chain extender designed by Peng Xi is very complicated and the preparation process is long; the raw materials used by Jing-Cang Su, Gao Yi, Wei-Dong Li, etc. are easy to obtain , but its preparation process is long, and a large amount of organic solvents are also used in the preparation process
These problems limit the promotion and application of polyurethane solid-solid phase change materials

Method used

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  • Preparation method of polyurethane solid-solid phase-change material with high enthalpy of phase change

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preparation example Construction

[0043] The one-step preparation method of the polyurethane solid-solid phase change material of high phase change enthalpy of the present invention, comprises the steps of following order successively:

[0044] (1) Vacuumize polyol I and polyol II at a temperature of 120°C to 140°C for 2h to 4h, so that the moisture content in the raw material is lower than 0.02%, and cool the raw material to 60°C to 100°C;

[0045] (2) Mix polyol Ⅰ and polyol Ⅱ evenly in proportion to remove air bubbles;

[0046] (3) Add diisocyanate to the mixture of polyol I and polyol II obtained in step (2), and stir for 1min~5min at a stirring speed of 500rpm~2500rpm;

[0047] (4) Add a catalyst to the material obtained in step (3), and stir for 10s~300s at a stirring speed of 500rpm~2500rpm;

[0048] (5) removing air bubbles in the material obtained in step (4);

[0049] (6) Pour the material obtained in step (5) into a mold at a temperature of 40°C~80°C, then place the mold in an oven at 80°C~120°C f...

Embodiment 1

[0058] The polyol I used in the formula is polyethylene glycol with a relative molecular mass of 6000, the polyol II is polyhexamethylene adipate polyol with a relative molecular mass of 3000, and the diisocyanate used is polyol-modified diphenyl methyl methane diisocyanate. When preparing the material, polyethylene glycol with a relative molecular mass of 6000 and polyhexamethylene adipate polyol with a relative molecular mass of 3000 were heated and melted, and then placed in a vacuum oven at 140°C for 4 hours of vacuum treatment. Cool to 80°C and set aside. Add 82.8 parts of polyethylene glycol and 11.2 parts of polyhexamethylene adipate polyol into the reaction kettle and mix evenly, remove air bubbles, and control the temperature of the reactant at 80°C; add 5.9 parts of polyol to the above mixture to modify Diphenylmethane diisocyanate, stirred at a stirring rate of 1500rpm for 5min, then added 0.1 part of dibutyltin dilaurate, stirred for 15s, removed the air bubbles i...

Embodiment 2

[0063] Others of this embodiment are the same as Example 1, except that the consumption of polyethylene glycol is 74.9 parts, the consumption of polyhexamethylene adipate polyol is 18.7 parts, polyol modified diphenylmethane diisocyanate The dosage is 6.3 parts.

[0064] The melting peak temperature of the prepared material is 56.9 ℃, the melting enthalpy is 96.2 J / g, the crystallization peak temperature is 35.0 ℃, and the crystallization enthalpy is 84.2 J / g. The phase transition process of the material is solid-solid phase transition.

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Abstract

The invention provides a preparation method of a polyurethane solid-solid phase-change material with high enthalpy of phase change. The formulation of the polyurethane solid-solid phase-change material comprises the following components in percentage by weight: 65-96% of polyhydric alcohol I, 1-30% of polyhydric alcohol II, 3-20% of diisocyanate and 0-3% of catalysts. The preparation method provided by the invention comprises the steps of: carrying out a reaction on the polyhydric alcohol I (or the polyhydric alcohol I) and the diisocyanate, so as to synthesize a prepolymer; uniformly mixing the prepolymer with the polyhydric alcohol I (or the polyhydric alcohol I), and carrying out defoaming after adding the catalysts; and pouring the mixture into a mold, and carrying out solidifying, cooling and demolding, so as to obtain the polyurethane solid-solid phase-change material. According to the preparation method, the raw materials are easily available, the preparation method is simple and convenient and is easy to control, and organic solvents harmful to an environment or a human body are avoided in the preparation process.

Description

Technical field [0001] The invention involves a phase-changing energy storage material and its preparation method, which specializes in a polyurethane solid-solid-phase transformer material and its preparation method with a high phase transformer. Background technique [0002] Energy is the basis for human beings to survive and develop. Because energy supply and demand have strong time dependence, people often need to store the energy that is not used for the time being, and then release it when needed to improveEnergy efficiency.Phase Change Materials (PCM) is absorbed or released when the substance is transformed or released when the substance is transformed for storage or interpretation.Relieving, alleviating energy tension, has been widely used in daily necessities such as refrigerators, air -conditioning, smart buildings, and warm clothing, heater, and energy storage cooker. [0003] According to the form of phase change, the phase transformer material can be divided into fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/73C08G18/48C08G18/42C08G18/08C08G18/12C09K5/02
Inventor 田春蓉王建华高毅周秋明余雪江陈可平贾晓蓉
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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