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Method for preparing phase-change nano capsule at room temperature

A nanocapsule and phase change technology, applied in the preparation of microspheres, microcapsule preparations, chemical instruments and methods, etc., can solve the problems of low heat transfer rate, particle collision damage, small surface area of ​​capsules, etc., and achieve uniform particle size distribution, The effect of increased capsule surface area and uniform particle size

Inactive Publication Date: 2014-05-21
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The capsule surface area of ​​phase change microcapsules is small, the heat transfer rate is low, and the possibility of particle collision damage during use is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] (1) Preparation of fine emulsion: Add 1.0 g of solid paraffin to the aqueous solution of sodium lauryl sulfate, then heat until the paraffin melts, stir and pre-emulsify for 0.5 hours, and then ultrasonically finely emulsify for 3 minutes with an ultrasonic cell disruptor. to obtain a fine emulsion;

[0011] (2), preparation of phase-change nanocapsules: reduce the miniemulsion prepared in step (1) to 20 o C, make the paraffin wax microemulsion drop into solid fine particles, then add styrene and acrylic acid, deoxygenate with nitrogen for 0.5 hours, add K 2 S 2 o 8 -Na 2 SO 3 The oxidation-reduction initiator initiates the polymerization reaction for 10 hours. Paraffin in the reaction: styrene: acrylic acid: sodium lauryl sulfate: water: K 2 S 2 o 8 :Na 2 SO 3 The mass ratio is 1:1.5:0.015:0.03:20:0.03:0.015.

[0012] (3) Post-processing: The product obtained in step (2) is demulsified, filtered, washed with water several times, and vacuum-dried to obtain th...

Embodiment 2

[0014] (1) Preparation of miniemulsion: Add 1.0g of solid paraffin to the aqueous solution of sodium lauryl sulfate, then heat until the paraffin melts, stir and pre-emulsify for 0.5 hours, and then ultrasonically microemulsify for 4 minutes with an ultrasonic cell disruptor. to obtain a fine emulsion;

[0015] (2), preparation of phase-change nanocapsules: reduce the miniemulsion prepared in step (1) to 25 o C, make the paraffin wax microemulsion drop into solid fine particles, then add styrene and acrylic acid, deoxygenate with nitrogen for 0.5 hours, add K 2 S 2 o 8 -Na 2 SO 3 The oxidation-reduction initiator initiates the polymerization reaction for 8 hours. Paraffin in the reaction: styrene: acrylic acid: sodium lauryl sulfate: water: K 2 S 2 o 8 :Na 2 SO 3 The mass ratio is 1:2:0.03:0.05:30:0.04:0.02.

[0016] (3) Post-treatment: The product obtained in step (2) is demulsified, filtered, washed with water several times, and vacuum-dried to obtain the product....

Embodiment 3

[0018] (1) Preparation of fine emulsion: Add 1.0 g of solid paraffin to the aqueous solution of sodium lauryl sulfate, then heat until the paraffin melts, stir and pre-emulsify for 1 hour, and then ultrasonically fine emulsify for 5 minutes with an ultrasonic cell disruptor. to obtain a fine emulsion;

[0019] (2) Preparation of phase-change nanocapsules: reduce the miniemulsion prepared in step (1) to 30 o C, make the paraffin fine emulsion drop into solid fine particles, then add styrene and acrylic acid, deoxygenate with nitrogen for 1 hour, add K 2 S 2 o 8 -Na 2 SO 3 Oxidation-reduction initiators initiate the polymerization reaction for 6 hours. Paraffin in the reaction: styrene: acrylic acid: sodium lauryl sulfate: water: K 2 S 2 o 8 :Na 2 SO 3 The mass ratio is 1: 4: 0.08: 0.1: 40: 0.08: 0.04.

[0020] (3) Post-treatment: Demulsify the product obtained in step 2, filter, wash with water several times, and dry in vacuum to obtain the product. Technical indica...

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Abstract

The invention discloses a method for preparing a phase-change nano capsule at a room temperature, which has a simple process. The method comprises the following steps: (1) preparing mini-emulsion, namely adding solid paraffin into a water solution of lauryl sodium sulfate; heating until the paraffin is smelted and agitating and pre-emulsifying for 0.5-1 hour; and then carrying out ultrasonic mini-emulsification for 3-5 minutes by using an ultrasonic cell crusher to obtain the mini-emulsion; (2) preparing the phase-change nano capsule, namely cooling the mini-emulsion prepared by the step (1) to 20-30 DEG C to convert the paraffin mini-emulsion drops into small solid grains; adding styrene and acrylic acid; introducing nitrogen to remove oxygen for 0.5-1 hour; adding a K2S2O8-Na2SO3 oxidization-reduction initiator to initiate a polymerization reaction; reacting for 6-10 hours, wherein in the reaction, the mass ratio of the paraffin to the styrene to the acrylic acid to the lauryl sodium sulfate to the water to the K2S2O8 to the Na2SO3 is 1 to (1.5-4) to (0.015-0.08) to (0.03-0.1) to (20-40) to (0.03-0.08) to (0.15-0.04); and (3) carrying out post-treatment, namely carrying out demulsification, filtering and water washing on a product obtained by the step (2), and drying in vacuum to prepare the phase-change nano capsule.

Description

technical field [0001] The invention relates to a method for preparing an energy storage material, in particular to a method for preparing phase-change nanocapsules at room temperature. Background technique [0002] With the rapid development of global industry and the increasing shortage of global energy, the research and development of energy saving and energy storage technology has become a hot issue that people pay attention to. The vast majority of energy in consumption is utilized in the form of heat energy, or converted from heat energy into other forms of energy and then utilized. Therefore, the storage and effective utilization of thermal energy is an important research topic for improving energy efficiency and developing renewable energy. Phase change energy storage materials have received high attention because they can recycle energy and greatly improve energy utilization, and have been widely used in various fields such as solar energy utilization, waste heat r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/14C09K5/06
Inventor 张峰侯贵华许宁
Owner YANCHENG INST OF TECH