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Process for preparing shaped phase change material

A technology of shape-setting phase change materials and phase change materials, applied in the field of preparation of shape-setting phase change materials

Inactive Publication Date: 2002-09-18
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

No results reported for phase transition enthalpy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Heat the double-roller rubber mixer to about 80°C, first plasticize the low-density polyethylene into sheets, and then gradually add #60 semi-refined paraffin wax between room temperature and 40°C until the ratio of the two reaches 20 / 80, mixing evenly.

[0024] (2) Pulverize the mixture in a plastic pulverizer.

[0025] (3) Add the pulverized mixture into the plastic extruder, set the heating temperature of the barrel to 90°C, the heating temperature of the screw part to 100°C, the heating temperature of the die to 90°C, and the screw speed to 25-30r / min.

[0026] (4) Dry the extruded melt after cooling with water.

[0027] The measured phase transition temperature is 60.18°C, and the phase transition enthalpy is 144.4 kJ / kg.

Embodiment 2

[0029] (1) Heat the double-roller rubber mixer to about 100°C, first plasticize the polypropylene into sheets, and then gradually add #48 paraffin slices between room temperature and 40°C until the ratio of the two reaches 50 / 50, Mix well.

[0030] (2) Pulverize the mixture in a plastic pulverizer.

[0031] (3) Add the pulverized mixture into the plastic extruder, set the heating temperature of the barrel to 150°C, the heating temperature of the screw part to 160°C, the heating temperature of the die to 150°C, and the screw speed to 25-30r / min.

[0032] (4) Dry the extruded melt after cooling with water.

[0033] The measured phase transition temperature is 50.72°C, and the phase transition enthalpy is 79.57kJ / kg.

Embodiment 3

[0035] (1) Heat the double-roller rubber mixer to about 80°C, first plasticize the high-density polyethylene into sheets, and then gradually add #60 semi-refined paraffin between room temperature and 40°C until the ratio of the two reaches 10 / 90, mixing evenly.

[0036] (2) Pulverize the mixture in a plastic pulverizer.

[0037] (3) Add the pulverized mixture into the plastic extruder, set the heating temperature of the barrel to 120°C, the heating temperature of the screw part to 130°C, the heating temperature of the die to 120°C, and the screw speed to 25-30r / min.

[0038] (4) Dry the extruded melt after cooling with water.

[0039] The measured phase transition temperature is 60.54°C, and the phase transition enthalpy is 174.8 kJ / kg.

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Abstract

A process for preparing a form-fixed phase change material includes plasticizing olefine polymer (10-50 wt.%) to become chips, gradually adding paraffine until its content is 90-50 wt%, breaking, smelting-extruding out, water cooling and baking. The said polymer may be at least one of polyethene, polypropene, polybutene, etc. The resultant material features 25-70 deg.c for phase-changing temp, high phase-changing enthalpy up to 175 KJ / kg and no molecular leakage.

Description

technical field [0001] The invention relates to a preparation method of a phase-change material, in particular to a preparation method of a fixed-shape phase-change material using paraffin wax and olefin polymers as raw materials. Background technique [0002] Using the latent heat of phase change materials to store or release thermal energy can create various facilities that improve energy utilization. At the same time, using the characteristics of phase change materials that the temperature is approximately constant during phase change can achieve the purpose of temperature control. Therefore, in today's increasingly tense energy supply, the application of phase change materials can greatly alleviate the contradiction between energy supply and demand. At present, this kind of material has been widely used in civil and military fields such as solar energy utilization, waste heat recovery, intelligent automatic air-conditioning buildings, glass greenhouses, phase-change ener...

Claims

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Application Information

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IPC IPC(8): C09K5/06
Inventor 杨睿张寅平秦鹏华贾俊
Owner TSINGHUA UNIV
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