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Phase change microcapsule based on ultrasound wave irradiation technology and preparing method

A technology of phase change microcapsules and irradiation technology, which is applied in the field of phase change material preparation, can solve the problems of large volume change during the phase change process, slow response speed of temperature change, and non-compliance with environmental protection requirements, and achieve high latent heat of phase change, high temperature The effect of fast change response speed and large latent heat of melting phase change

Inactive Publication Date: 2019-05-31
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In recent years, the modification method that has been studied more is to use in-situ polymerization to synthesize microencapsulated particles of phase change materials with formaldehyde as the shell material and paraffin as the phase change material. However, affected by the preparation process and the inherent properties of the materials, this The preparation process leaves formaldehyde in the capsule wall, such as melamine-formaldehyde, gelatin-formaldehyde and urea-formaldehyde shell microcapsules usually release toxic formaldehyde during application, which does not meet environmental protection requirements
At the same time, as a core material, paraffin wax has defects such as low density, low thermal conductivity, large volume change during phase transition, and slow response to temperature changes.

Method used

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  • Phase change microcapsule based on ultrasound wave irradiation technology and preparing method
  • Phase change microcapsule based on ultrasound wave irradiation technology and preparing method
  • Phase change microcapsule based on ultrasound wave irradiation technology and preparing method

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preparation example Construction

[0038] Correspondingly, the embodiment of the present invention also provides a preparation method of the phase-change microcapsules of the above-mentioned embodiments. Embodiments of the present invention phase change microcapsules preparation method process such as figure 1 shown, including the following steps:

[0039] Step S01, preparing styrene-maleic anhydride copolymer emulsifier: adding styrene-maleic anhydride copolymer powder, NaOH and deionized water to the container in sequence, stirring magnetically at 80-90°C for 1-3 hours, when the solution When it is light yellow and transparent, use citric acid to adjust the pH value of the solution to 4-6 to obtain a styrene-maleic anhydride copolymer emulsifier;

[0040] Step S02, preparing the oil phase mixture: adding urethane acrylate, 1,4-butanediol diacrylate, acrylic acid, azobisisobutyronitrile and n-dodecanol to the container in sequence, and ultrasonic irradiation at 25-45°C Stir at a constant temperature for 30-4...

Embodiment 1

[0048] Styrene-maleic anhydride copolymer 1.8g

[0049] Sodium hydroxide 0.6g

[0050] Urethane acrylate 9.0g

[0051] 1,4-Butanediol diacrylate 3.0g

[0052] Acrylic acid 2.0g

[0053] Azobisisobutyronitrile 0.15g

[0054] n-dodecyl alcohol 11.5g

[0055] Deionized water 120.0g

[0056] Preparation of styrene-maleic anhydride copolymer emulsifier: Add styrene-maleic anhydride copolymer powder, NaOH, and deionized water into a three-necked flask, stir magnetically and heat up to 85°C in a water bath, and keep it for 1 hour. When the solution is light yellow and transparent, adjust the pH value of the solution to 5 with citric acid;

[0057] The concentration of styrene-maleic anhydride copolymer emulsifier is 4mg·mL ～1 ;

[0058] Prepare the oil phase mixture: Add polyurethane acrylate, 1,4-butanediol diacrylate, acrylic acid, azobisisobutyronitrile, n-dodecanol to the container in sequence, and stir for 30 minutes under ultrasonic irradiation at 30°C ;

[0059] Prep...

Embodiment 2

[0064] Styrene-maleic anhydride copolymer 1.8g

[0065] Sodium hydroxide 0.6g

[0066] Urethane acrylate 9.0g

[0067] 1,4-Butanediol diacrylate 3.0g

[0068] Acrylic acid 2.0g

[0069] Azobisisobutyronitrile 0.15g

[0070] n-dodecyl alcohol 11.5g

[0071] Deionized water 120.0g

[0072] Preparation of styrene-maleic anhydride copolymer emulsifier: Add styrene-maleic anhydride copolymer powder, NaOH, and deionized water into a three-necked flask, stir magnetically and heat up to 90°C in a water bath, and keep it for 2 hours. When the solution is light yellow and transparent, adjust the pH value of the solution to 5 with citric acid;

[0073] The concentration of styrene-maleic anhydride copolymer emulsifier is 8mg·mL ～1 ;

[0074] Prepare the oil phase mixture: add polyurethane acrylate, 1,4-butanediol diacrylate, acrylic acid, azobisisobutyronitrile, n-dodecanol to the container in sequence, and stir for 20 minute;

[0075] Preparation of oil-in-water emulsion: Afte...

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Abstract

The invention discloses a preparing method of a phase change microcapsule. The method includes the steps of preparing a styrene-maleic anhydride copolymer emulsifier, preparing an oil phase mixture, preparing an oil-in-water emulsion, and preparing the phase change microcapsule. The phase change microcapsule based on the ultrasound wave irradiation technology comprises a shell and a phase change material arranged in the shell. The shell comprises polyurethane acrylate, 1,4-butanediol diacrylate, acrylic acid and azodiisobutyronitrile. The phase change material is dodecyl alcohol. The phase change microcapsule presents the complete spherical shape, is smooth and uniform in surface, large in melting phase change latent heat, high in coating rate and high in temperature change response speedand is widely applied in the fields of building materials and air conditioning refrigeration.

Description

technical field [0001] The invention belongs to the technical field of preparation of phase-change materials, and in particular relates to a phase-change microcapsule based on ultrasonic irradiation technology and a preparation method thereof. Background technique [0002] The process of transition of materials between solid, liquid and gas is called phase transition. During the phase change process, heat will be released or absorbed, and the material will maintain a constant temperature. Materials with this characteristic are called phase change materials. Phase change materials can be divided into inorganic phase change materials, organic phase change materials and composite phase change materials according to their chemical composition. Inorganic phase change materials include crystalline hydrated salt, molten salt, metal alloy and other inorganic substances; organic phase change materials include paraffin, Carboxylic acid, ester, polyol and other organic substances; hyb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
Inventor 鲁进利李洋吴丽韩亚芳孙智勇
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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