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Preparation method of microencapsulated stabilized phase-change material

A phase change material and microencapsulation technology, applied in chemical instruments and methods, heat exchange materials, etc., can solve the problems of poor compatibility of building materials, increase thermal conductivity of polymers, poor thermal conductivity, etc., and achieve superior thermal conductivity , broad application prospects, good compatibility

Inactive Publication Date: 2017-05-31
闫博文
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention: Aiming at the problems that the traditional stereotyped phase change materials have relatively poor thermal conductivity, resulting in insufficient heat absorption and release, and poor compatibility with building materials, a phase change material using fatty acid and paraffin wax is provided. , after microencapsulation by graphite-doped polyethylene coating, and then further coating with silicon dioxide to prepare the microencapsulated stereotyped phase change material, the present invention first uses soapstock as raw material, undergoes saponification, acidolysis Finally, fatty acid is obtained, and then mixed with paraffin to obtain a phase change material. Fatty acid can reduce the melting point of paraffin, and then insert vinyl monomer into graphite sheet, and the graphite sheet is separated by polymerization, graphite is doped into the polymer, and the polymer increases. The thermal conductivity, and then through the emulsion reaction, the polymer embeds the phase change material, and then uses tetraethyl orthosilicate as the raw material, and the silica is deposited on the surface of the polymer to form a coating through the action of alkali, and the silica and building materials It has good compatibility, and finally the microencapsulated shaped phase change material can be obtained after drying. The microencapsulated shaped phase change material prepared by the present invention has excellent thermal conductivity, good compatibility with building materials, and will not affect the quality of building materials. Relevant mechanical properties, has a wide range of application prospects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0017] First, weigh 400g of soapstock and add it to a beaker filled with 500mL of 15% sodium hydroxide solution, place the beaker in an oil bath, control the temperature at 100°C, and saponify with magnetic stirring for 4 hours, then add to the beaker The mass fraction is 25% citric acid solution to adjust the pH to 6.2, continue to stir and react for 40 minutes, collect the product after the reaction is completed, and after the temperature of the product drops to 30 ° C, add 400 mL of ether to the product, stir and mix for 3 minutes, and then let it stand for stratification. Collect the upper organic phase, and move the upper organic phase into a rotary evaporator, and evaporate to 1 / 3 of the original volume of the upper organic phase to obtain a concentrated solution; weigh 200g of 52# paraffin and 300g of 54# paraffin into a beaker, and place the beaker in In a water bath, control the temperature at 80°C, stir and melt for 50 minutes, then add 150g of the above concentrated ...

example 2

[0020] First, weigh 300g of soapstock and add it to a beaker filled with 400mL of 15% sodium hydroxide solution, place the beaker in an oil bath, control the temperature at 90°C, and saponify with magnetic stirring for 3 hours, then add to the beaker The mass fraction is 25% citric acid solution to adjust the pH to 5.8, continue to stir the reaction for 30 minutes, and collect the product after the reaction is completed. After the temperature of the product drops to 25 ° C, add 300 mL of ether to the product, stir and mix for 1 minute, and then let it stand for stratification. Collect the upper organic phase, and move the upper organic phase into a rotary evaporator, and evaporate to 1 / 3 of the original volume of the upper organic phase to obtain a concentrated solution; weigh 100g of 52# paraffin and 200g of 54# paraffin into a beaker, and place the beaker in In a water bath, control the temperature at 70°C, stir and melt for 40 minutes, then add 100g of the above concentrated...

example 3

[0023] First, weigh 350g of soapstock and add it to a beaker filled with 450mL of 15% sodium hydroxide solution, place the beaker in an oil bath, control the temperature at 95°C, and saponify with magnetic stirring for 3 hours, then add to the beaker The mass fraction is 25% citric acid solution to adjust the pH to 6.1, continue to stir and react for 35 minutes, collect the product after the reaction is completed, and after the temperature of the product drops to 27 ° C, add 350 mL of ether to the product, stir and mix for 2 minutes, and then let it stand for stratification. Collect the upper organic phase, and move the upper organic phase into a rotary evaporator, and evaporate to 1 / 3 of the original volume of the upper organic phase to obtain a concentrated solution; weigh 150g of 52# paraffin and 250g of 54# paraffin into a beaker, and place the beaker in In a water bath, control the temperature at 75°C, stir and melt for 45 minutes, then add 120g of the above concentrate to...

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PUM

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Abstract

The invention relates to a preparation method of a microencapsulated stabilized phase-change material and belongs to the technical field of phase-change materials. The preparation method comprises the following steps: firstly, taking soap stock as a raw material; carrying out saponification and acidolysis to obtain fatty acid; mixing the fatty acid with paraffin wax to obtain a phase-change material, wherein the fatty acid can be used for reducing the melting point of the paraffin wax; inserting an ethylene monomer into a graphite flake layer; polymerizing to separate the graphite flake layer; doping graphite into a polymer so as to increase the thermal conductivity of the polymer; carrying out emulsion reaction to coat the phase-change material with the polymer; taking tetraethyl orthosilicate as a raw material and depositing silicon dioxide on the surface of the polymer under the action of alkali to form a coating film; finally, drying to obtain the microencapsulated stabilized phase-change material. The microencapsulated stabilized phase-change material prepared by the preparation method has an excellent heat-conducting performance, the phase change enthalpy reaches 130.14kJ / kg to 135.25kJ / kg and the phase change temperature is 20 DEG C to 40 DEG C; the microencapsulated stabilized phase-change material has good compatibility with a building material and related mechanical properties of the building material are not influenced; the microencapsulated stabilized phase-change material has wide application prospect.

Description

technical field [0001] The invention relates to a preparation method of a microencapsulated and shaped phase-change material, and belongs to the technical field of phase-change material preparation. Background technique [0002] In my country, buildings have gradually become one of the main energy consumption. Building energy consumption currently accounts for about 25% of the total energy consumption of the national economy, and it is showing an increasing trend. According to tests, about 50% of the total energy consumption of buildings is caused by walls. of. Although the widely used external wall insulation and internal wall insulation technology can reduce energy consumption, due to the limited heat capacity of the material itself, the energy cannot be fully stored and utilized, thus limiting the energy saving capacity of the building. Phase change materials are environmentally friendly and energy-saving intelligent materials with broad application prospects. It has uni...

Claims

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Application Information

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IPC IPC(8): C04B24/42C04B24/36C09K5/06
CPCC09K5/063C04B40/0039C04B2103/0071C04B24/08C04B24/36C04B14/024C04B24/005C04B24/00C04B24/32C04B22/14C04B24/42C04B24/20C04B22/062
Inventor 闫博文薛洋王维
Owner 闫博文
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