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Method for preparing waste acrylic fiber and fatty acid combined phase change material

A technology of composite phase change material and acrylic fiber waste silk, which is applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of leakage of phase change materials of phase change materials, achieve low price, reduce environmental pollution, and improve the preparation process simple effect

Inactive Publication Date: 2013-05-08
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the literature reports that dibasic fatty acids are directly compounded with inorganic particles to obtain phase change materials, there are serious problems such as leakage of phase change materials in this phase change material.

Method used

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  • Method for preparing waste acrylic fiber and fatty acid combined phase change material
  • Method for preparing waste acrylic fiber and fatty acid combined phase change material
  • Method for preparing waste acrylic fiber and fatty acid combined phase change material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 2g of acrylic fiber waste, 6.67g of lauric acid, 1.33g of stearic acid, and 25g of N,N-dimethylformamide (DMF) into a three-necked flask, and stir and reflux at 90°C for a period of time to obtain a uniform milky white polymer. solution. When the polymer solution is injected into water, a white precipitate appears, and after drying, it becomes a composite phase change material of acrylic fiber waste silk and fatty acid.

[0023] Carry out infrared spectrum (see figure 1 ) analysis, the spectrogram of the phase change material prepared by the invention is not the simple summation of three raw materials, but the disappearance of some characteristic peaks and the generation of new characteristic peaks, indicating that although the same series of fatty acids stearic acid and lauric acid Between, there will be no chemical reaction between acrylic fiber (PAN) and dibasic fatty acid, but there is a certain physical interaction between the three after mixing, such as only ...

Embodiment 2

[0026] Add 5g of acrylic fiber waste, 3.33g of lauric acid, 1.67g of stearic acid, and 25g of N,N-dimethylformamide (DMF) into a three-necked flask, and stir and reflux at 60°C for a period of time to obtain a uniform milky white polymer. solution. The polymer solution is injected into a 15% polyvinyl alcohol aqueous solution, and a white precipitate occurs,

[0027] After drying, it becomes a composite phase change material of acrylic fiber waste silk and fatty acid.

Embodiment 3

[0029] Preparation of acrylic waste silk and stearic acid composite phase change material: Add 4g of acrylic waste silk, 6g of stearic acid, and 25g of N,N-dimethylformamide (DMF) into a three-necked flask, and stir and reflux at 60°C for a period of time After that, a homogeneous milky white polymer solution was obtained. When the polymer solution is injected into water, a white precipitate appears, and after drying, it becomes a composite phase change material of acrylic fiber waste silk and fatty acid.

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Abstract

The invention relates to a method for preparing a waste acrylic fiber and fatty acid combined phase change material, which comprises: preparing uniform polymer solution by stirring waste acrylic fibers and fatty acid in a solvent; and allowing the polymer solution to precipitate in a precipitator quickly. Macro molecules of polyacrylonitrile and molecules of fatty acid are agglomerated together through the intermolecular forces, so that the phase change material does not seeps out even the outside temperature reaches 100 DEG C. The amorphous phase change material prepared by the method has the advantages that: the enthalpy value and thermal stability are high; the preparation method is simple; the cost is low; the solvent can be recycled; and the like. The method realizes waste fiber recycling, reduces environmental pollution and provides a new energy-saving material for the society. The invention is a new project with low cost, high profit and sufficient resources, and has a bright development prospect.

Description

technical field [0001] The invention belongs to the technical field of phase-change energy storage materials, and in particular relates to a method for preparing phase-change materials composited with waste acrylic fibers and fatty acids. Background technique [0002] Phase-change energy storage materials are substances that use the heat-absorbing and exothermic effects of materials during the phase-change process to store thermal energy and regulate temperature. Phase change materials have the advantages of approximately constant temperature during the phase change process, and the system temperature can be controlled. Crisis, improving energy efficiency and other aspects have played an important role. [0003] Due to structural reasons, acrylic fiber cannot be regenerated by thermal melting and re-granulation, nor can it be recycled by thermal cracking. However, there are active cyano groups (-C≡N) in its molecular structure, which can be transformed by cyano groups. Acr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/02C09K5/06
Inventor 郭静相恒学
Owner DALIAN POLYTECHNIC UNIVERSITY
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