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Modified urea resin low-temperature phase change microcapsule and preparation method thereof

A urea-formaldehyde resin, low-temperature phase change technology, applied in microcapsule preparation, microsphere preparation, chemical instruments and methods, etc., can solve the problems of urea-formaldehyde resin poor water resistance and weather resistance, large release of free formaldehyde, short storage period, etc. The effect of inhibiting food spoilage

Inactive Publication Date: 2014-08-27
SHANGHAI INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, urea-formaldehyde resin has disadvantages such as poor water resistance and weather resistance, short storage period, and large release of free formaldehyde.

Method used

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  • Modified urea resin low-temperature phase change microcapsule and preparation method thereof
  • Modified urea resin low-temperature phase change microcapsule and preparation method thereof
  • Modified urea resin low-temperature phase change microcapsule and preparation method thereof

Examples

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preparation example Construction

[0049] The specifications of each used preparation raw material or reagent of the present invention and the information of the manufacturer are as follows:

[0050] Urea, analytically pure, Sinopharm Chemical Reagent Co., Ltd.;

[0051] Formaldehyde, analytically pure, Sinopharm Chemical Reagent Co., Ltd.;

[0052] Triethanolamine, analytically pure, Sinopharm Chemical Reagent Co., Ltd.;

[0053] Melamine, analytically pure, Sinopharm Chemical Reagent Co., Ltd.;

[0054] n-tetradecane, analytically pure, Sinopharm Chemical Reagent Co., Ltd.;

[0055] Polyvinyl alcohol, analytically pure, Sinopharm Chemical Reagent Co., Ltd.;

[0056] Tween-80, analytically pure, Sinopharm Chemical Reagent Co., Ltd.;

[0057] Span-80, analytically pure, Sinopharm Chemical Reagent Co., Ltd.;

[0058] Sodium chloride, analytically pure, Sinopharm Chemical Reagent Co., Ltd.;

[0059] Sodium carbonate, analytically pure, Sinopharm Chemical Reagent Co., Ltd.;

[0060] Hydrochloric acid, analy...

Embodiment 1

[0074] A low-temperature phase-change solid microcapsule of modified urea-formaldehyde resin, using the low-temperature organic phase-change material n-tetradecane as the core material, and wrapping urea and formaldehyde on the surface of the low-temperature organic phase-change material n-tetradecane by in-situ polymerization As the raw material, the urea-formaldehyde resin obtained through polycondensation reaction with melamine and polyvinyl alcohol as the modifier is used as the outer wall material.

[0075] The composition and content of the above-mentioned modified urea-formaldehyde resin low-temperature phase-change solid microcapsules are calculated in parts by weight as follows:

[0076] urea 5 parts

[0077] Formaldehyde 15 parts

[0078] 2.2 parts of melamine

[0079] Span-80 0.45 parts

[0080] Tween-80 0.55 parts

[0081] 20 parts n-tetradecane

[0082] 0.2 parts of polyvinyl alcohol

[0083] Mass percentage concentration is 10 parts of sodium chloride aqueo...

Embodiment 2

[0093] A low-temperature phase-change solid microcapsule of modified urea-formaldehyde resin, using the low-temperature organic phase-change material n-tetradecane as the core material, and wrapping urea and formaldehyde on the surface of the low-temperature organic phase-change material n-tetradecane by in-situ polymerization As the raw material, the urea-formaldehyde resin obtained through polycondensation reaction with melamine and polyvinyl alcohol as the modifier is used as the outer wall material.

[0094] The composition and content of the above-mentioned modified urea-formaldehyde resin low-temperature phase-change solid microcapsules are calculated in parts by weight as follows:

[0095] Urea 5.6 parts

[0096] Formaldehyde 18 parts

[0097] 2.5 parts of melamine

[0098] Span-80 0.48 parts

[0099] Tween-80 0.52 parts

[0100] n-tetradecane 25 parts

[0101] 0.3 parts of polyvinyl alcohol

[0102] Mass percent concentration is 12 parts of 10% sodium chloride aq...

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Abstract

The invention relates to a modified urea resin low-temperature phase change microcapsule and a preparation method thereof. The modified urea resin low-temperature phase change microcapsule takes n-tetradecane as an internal core material, the surface of the n-tetradecane is wrapped with a urea resin as an outer-layer wall material by using an in-situ polymerization method, the urea resin is prepared by taking urea and formaldehyde as raw materials and melamine and polyving alcohol as modifying agents through polycondensation reaction, and the modified urea resin low-temperature phase change microcapsule is prepared from the following components in parts by weight: 4-10 parts of urea, 10-20 parts of formaldehyde, 2-5 parts of melamine, 0.2-0.8 part of span-80, 0.2-0.8 part of tween-80, 15-35 parts of n-tetradecane, 0.2-0.8 part of polyving alcohol and 5-20 parts of sodium chloride water solution of which the mass percentage concentration is 10%. The modified urea resin low-temperature phase change microcapsule is safe and non-toxic, energy-saving and environment-friendly, high in heat conduction efficiency and high in thermal stability, and the application field of a low-temperature organic phase change material is widened.

Description

technical field [0001] The invention relates to a microcapsule and a preparation method thereof, in particular to a modified urea-formaldehyde resin low-temperature phase-change microcapsule and a preparation method thereof. Background technique [0002] Phase change materials can absorb or release a large amount of latent heat during the phase change process, and the temperature of the material itself changes very little during the process, so it has great significance in the fields of energy saving and temperature control, and is very suitable for solving energy supply problems. The problem of imbalance with demand. Microencapsulating the phase change material not only effectively increases its heat conduction area, reduces the possibility of its reaction with surrounding substances, but also controls its volume change during the phase change process, fundamentally overcoming the phase change. The limitations of the application of phase change materials have realized the ...

Claims

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Application Information

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IPC IPC(8): C09K5/06B01J13/14
Inventor 叶琳刘钦矿杨晓波宋晓秋
Owner SHANGHAI INSTITUTE OF TECHNOLOGY
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