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Energy-accumulating temp-controlled thermoplastic cross-link high-molecular composite material with solid-solid phase change and its preparing process

A composite material and phase change energy storage technology, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve problems such as difficulty in making various complex shapes, large investment in equipment, pollution, etc., and achieve good thermal stability, The effect of high energy storage density

Inactive Publication Date: 2004-03-17
云南玮昊能源发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This preparation method has the following disadvantages: (1) use radiation crosslinking or organic peroxide crosslinking method to crosslink polyethylene, the equipment investment is very large, and the production cost is very high; (2) the shape of the product after crosslinking polyethylene is impregnated (3) Cleaning with pentane or hexane after impregnation has problems of solvent recovery and environmental pollution; (4) Phase change materials are difficult to make into products of various complex shapes

Method used

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  • Energy-accumulating temp-controlled thermoplastic cross-link high-molecular composite material with solid-solid phase change and its preparing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020]With 1000 grams of high-density polyethylene (HDPE, 2200J, melt index: 7), 15 grams of vinyltrimethoxysilane (A171, U.S. Oskar product), 0.08 gram of dicumyl peroxide (DCP, industrial product) , and 4 grams of antioxidant 1010 were uniformly mixed and melt-grafted in a screw extruder, and the extrusion temperature was 220°C. The melt index of the grafted product was 1.8 and the gel content was zero. The grafted product was cut into pellets, soaked in an aqueous emulsion (80° C.) containing 0.05% dibutyltin dilaurate for 6 hours to obtain a cross-linked polyethylene with a gel content of 58.6%.

[0021] Vinyltrimethoxysilane (A171) in the above example was replaced by vinyltrimethoxyethoxysilane (A172), the melt index of the grafted product obtained was 0.6, and the gel content was 3.8%. The grafted product was cut into granules, soaked in an aqueous emulsion (80° C.) containing 0.05% dibutyltin dilaurate for 6 hours to obtain a cross-linked polyethylene with a gel conte...

Embodiment 2

[0023] Add paraffin wax with a crystallization melting point of 80°C into a container with heating and stirring, and heat to 160°C. The grafted polyethylene (melt index 1.8) obtained in Example 1 was added into the container according to the ratio of 30:70 to the paraffin wax, and stirring was applied to completely dissolve the grafted silane polyethylene in the paraffin wax. After the viscous melt is cooled, it is hot-pressed into a 2.5 mm thick sheet, and soaked in a hot water emulsion (80°C) containing 0.05% dibutyltin dilaurate for 4 hours to obtain a cross-linked polyethylene / paraffin polymer Solid-solid phase transition materials. The phase transition temperature of the material is 80° C. (the melting temperature measured by differential scanning calorimeter is 81.5° C., and the crystallization temperature is 79.6° C.), and the phase transition enthalpy is 137 joules / g.

[0024] The cross-linked polyethylene / paraffin wax macromolecular solid-solid phase transition mater...

Embodiment 3

[0029] The grafted polyethylene obtained in Example 1 (melt index 1.8) was cut into pellets, soaked in an aqueous emulsion (80° C.) containing 0.1% dibutyltin dilaurate for 6 hours, and obtained a gel content of 58.6%. Cross-linked polyethylene pellets. Soak the cross-linked polyethylene pellets in paraffin wax at 160°C and a crystal melting point of 60°C for swelling. After swelling for 4 hours, separate the swollen particles from the hot paraffin with a filter, and then put the swollen body into a hot water washing and separating device Remove paraffin adsorbed on the surface. After drying, the cross-linked polyethylene / paraffin wax polymer solid-solid phase transition material is obtained. The material contains 80% paraffin and has a phase transition enthalpy of 141 Joules / gram. The phase transition temperature is 60°C (the melting temperature measured by a differential scanning calorimeter is 61.7°C, and the crystallization temperature is 59.3°C).

[0030] Another cross...

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Abstract

The present invention features that the material has crosslinked crystalline polyolefin as base body and crystalline alkyl hydrocarbon dispersed inside the crosslinked net as the composite material for phase change energy accumulation. In the composite material, the phase change energy accumulating component accounting for 40-80 % has solid-solid phase conversion at phase change temperature of 20-80 deg.c and phase change enthalpy greater than 80 J / g. The composite phase change material has relatively high energy accumulating density and excellent heat stability, may be used as energy accumulating material for the accumulation of solar energy and industrial afterheat, constant temperature in building and energy saving in air conditioner and as temperature control material in electronic instrument, machinery, etc. widely.

Description

technical field [0001] The invention relates to the technical field of phase change energy storage materials, in particular to a preparation method of a cross-linked polymer solid-solid phase change energy storage temperature control composite material. Background technique [0002] Phase change energy storage materials can store and release energy at a constant temperature by utilizing their characteristics of absorbing or releasing a large amount of heat during the reversible phase change process. Compared with the sensible heat storage method, the use of phase change energy storage has the advantages of high energy storage density, high thermal efficiency, and constant temperature in the process of absorbing and releasing heat, so this kind of functional materials can be widely used in various fields of military and civilian use , including: (1) solar energy storage; (2) utilization of industrial waste heat; (2) energy storage during low-load periods of electricity; (...

Claims

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Application Information

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IPC IPC(8): C09K5/14
Inventor 俞强
Owner 云南玮昊能源发展有限公司
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