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Heat storage phase-changing material and method for producing the same

A phase change material and manufacturing method technology, applied in the fields of thermal insulation and building heating, can solve the problems of easy leakage, easy leakage of core materials, etc., and achieve the effects of not easy leakage, low cost, and small enthalpy value.

Inactive Publication Date: 2009-08-19
BEIJING JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: after the porous substance absorbs the core material, the core material is easy to leak, especially in the presence of a solvent, and the problem is to provide a heat storage phase change material and its Manufacturing method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In step 1, 0.3 g of urea is weighed and dissolved in water to prepare a solution with a mass fraction of 0.75%.

[0019] Step 2 Add 2 grams of paraffin and 0.22 grams of Tween-20, and stir evenly.

[0020] Step 3 Add 2 grams of diatomaceous earth, carry out distillation, and stir at the same time, until the water is completely evaporated.

[0021] Step 4 Cool down to 15 degrees Celsius, add 1.5 ml of formaldehyde solution with a mass fraction of 37% and 10 ml of water.

[0022] Step 5 Use 0.1 mol / L hydrochloric acid to adjust the pH to 4, react for 3 hours; filter with suction, wash with water, and dry to obtain 2.9 grams of heat storage phase change material.

[0023] The product is characterized by DSC, the content of the core material is 23.76%, the proportion of diatomaceous earth is 2 / 2.9=68.97%, and the proportion of urea-formaldehyde resin is 1-23.76%-68.97%=7.27%.

Embodiment 2

[0025] In step 1, 0.3 g of urea is weighed and dissolved in water to prepare a solution with a mass fraction of 0.75%.

[0026] Step 2, add 2 grams of hexadecane and 0.22 grams of Tween-20, and stir evenly.

[0027] Step 3, adding 2 grams of diatomaceous earth, distilling and stirring at the same time, until the water is completely evaporated.

[0028] Step 4, the temperature is lowered to 15 degrees Celsius, and 1.5 milliliters of formaldehyde solution with a mass fraction of 37% and 10 milliliters of water are added.

[0029] Step five, adjust the pH to 3 with 0.1 mol / L hydrochloric acid and react for 3 hours. Suction filtration, washing with water, and drying yielded 2.9 g of the product.

[0030] It was characterized by DSC, the content of the core material was 23.12%, the proportion of diatomite was 2 / 2.9=68.97%, and the proportion of urea-formaldehyde resin was 1-23.12%-68.97%=7.91%.

Embodiment 3

[0032] In step 1, 0.3 g of urea is weighed and dissolved in water to prepare a solution with a mass fraction of 0.75%.

[0033] Step 2, add 2 grams of octadecane and 0.22 grams of Tween-20, and stir evenly.

[0034] Step 3, add 2 grams of diatomaceous earth in step 3, distill and stir at the same time until the water is completely distilled.

[0035] Step 4, cool down to 15 degrees Celsius, add 1.5 ml of formaldehyde solution with a mass fraction of 37% and 10 ml of water, adjust the pH to 3 and react for 3 hours.

[0036] Step five, adjust the pH to 3 with 0.1 mol / L hydrochloric acid and react for 3 hours. Suction filtration, washing with water, and drying yielded 3.0 g of the product.

[0037] It is characterized by DSC, the content of the core material is 26.23%, the proportion of diatomite is 2 / 3.0=66.67%, and the proportion of urea-formaldehyde resin is 1-26.23%-66.67%=7.10%.

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Abstract

A heat accumulation phase-change material solves the problem that core materials are easy to leak after being absorbed by porous mass and is used for the fields such as warming, heat preservation, etc. The heat accumulation phase-change material comprises diatomite, expansive soil or expansion graphite, lauxite and core material which is paraffin, octadecane or cetane. A method for manufacturing the heat accumulation phase-change material comprises: step 1, carbamide is dissolved in water or absolute ethyl alcohol; step 2, the obtained solution is added with the core material and Tween-20 to be evenly stirred; step 3, the diatomite and the expansive soil or the expansion graphite are added into the mixed solution to be distilled and stirred until the absolute ethyl alcohol or the water is completely evaporated; step 4, when the temperature is lowered by 1-10 DEG C under the melting point of the core material, the obtained mixture is added with formaldehyde solution with the mass percentage being 37% and water having the mass being 5 times heavier than that of diatomite and expansive soil or the expansion graphite; step 5, the pH value is adjusted to be 3-4, and the reactants react for 3h and are processed by suction filtration, water rinse and desiccation; finally, the heat accumulation phase-change material is obtained.

Description

technical field [0001] The invention relates to a novel heat storage phase change material and a manufacturing method thereof, which are suitable for building heating, heat preservation and other fields. Background technique [0002] Heat storage technology can solve the contradiction between thermal energy supply and demand imbalance, and is an important technology to improve energy utilization efficiency and protect the environment. It has broad application prospects in solar energy utilization, industrial waste heat and waste heat recovery, energy saving of building heating and air conditioning, heat dissipation and cooling of electronic components, and many civil and military fields. The main problems hindering the application of phase change heat storage technology are: the low thermal conductivity of phase change heat storage materials, especially organic matter, and the fluidity of phase change materials in the process of solid and liquid phase change. The low therma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06C08L61/28C08K3/04C08K3/34
CPCY02E60/145F28D20/02Y02E60/14
Inventor 刘博付生军常进段武彪唐梦华郑惠钦王凯顾军
Owner BEIJING JIAOTONG UNIV
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