Inorganic/organic composite casing layer nanometer phase-change capsule cool-storage fluid and preparation method thereof

A nano-phase and shell technology, applied in chemical instruments and methods, heat exchange materials, etc., can solve the problems of rarely mentioned, difficult cooling energy transfer, brittle performance, etc., to ensure excellent performance and good thermal stability. , the effect of high phase change enthalpy

Inactive Publication Date: 2016-05-04
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As for the nanocapsule LFTF in the field of phase change cold storage air conditioning, so far, few mentions have been made.
Since the shell of the nanocapsule is a vinyl polymer, on the one hand, its long-term cold-heat cycle puts forward high requirements on the thermal stability (heat resistance) of the material; on the other hand, its own thermal conductivity is low, if As a cold storage fluid, it is

Method used

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  • Inorganic/organic composite casing layer nanometer phase-change capsule cool-storage fluid and preparation method thereof
  • Inorganic/organic composite casing layer nanometer phase-change capsule cool-storage fluid and preparation method thereof
  • Inorganic/organic composite casing layer nanometer phase-change capsule cool-storage fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0048] Example 1

[0049] (1) Under the condition of constant temperature water bath at 60℃, dissolve 5ml ethyl orthosilicate in 30ml absolute ethanol, add 0.008mol ammonia water dropwise, add 0.06g KH-570 after the reaction for 0.5h, continue the reaction for 2.5h, and naturally cool to The modified silica sol was prepared at room temperature. Ignoring other components, the theoretically calculated solid content is 16.7% (the same below).

[0050] (2) 10g of styrene, 12g of n-tetradecane, 0.4g of ethyl acrylate, 0.2g of dodecanethiol and 0.05g of azobisisobutyronitrile were prepared into oil phase liquid, and 0.3g of emulsifier (SDS) was added. : OP-10=1:1) in 100 g of water, use a homogenizer to emulsify for 10 min to obtain an emulsion.

[0051] (3) transfer the emulsion into a 250ml four-necked flask equipped with a reflux tube, nitrogen inlet, dropping funnel and mechanical stirring, first pass nitrogen for 15min to remove the oxygen in the system, then under the reflux...

Example Embodiment

[0053] Example 2

[0054] (1) Under the condition of constant temperature water bath at 60℃, dissolve 5ml ethyl orthosilicate in 30ml absolute ethanol, add 0.008mol ammonia water dropwise, add 0.06g KH-570 after the reaction for 0.5h, continue the reaction for 2.5h, and naturally cool to The modified silica sol was prepared at room temperature.

[0055] (2) 10g of styrene, 12g of n-tetradecane, 0.4g of ethyl acrylate, 0.2g of dodecanethiol and 0.05g of azobisisobutyronitrile were prepared into oil phase liquid, and 0.3g of emulsifier (SDS) was added. : OP-10=1:1) in 100 g of water, use a homogenizer to emulsify for 10 min to obtain an emulsion.

[0056] (3) transfer the emulsion into a 250ml three-necked flask equipped with a reflux tube, a nitrogen inlet and mechanical stirring, first pass nitrogen for 15 min to remove the oxygen in the system, then under the reflux tube condensation, heat up to 60 ° C, keep a water bath After 30min of polymerization reaction under constant...

Example Embodiment

[0058] Example 3

[0059] (1) Under the condition of constant temperature water bath at 60℃, dissolve 5ml tetrabutyl titanate in 30ml absolute ethanol, add 0.008mol ammonia water dropwise, add 0.06g KH-570 after the reaction for 0.5h, continue the reaction for 2.5h, and naturally cool to The modified titanium sol was prepared at room temperature.

[0060] (2) 10g of styrene, 12g of n-pentadecane, 0.4g of ethyl acrylate, 0.2g of dodecanethiol and 0.05g of azobisisobutyronitrile were prepared into an oil phase liquid, and 0.3g of emulsifier (SDS) was added. : OP-10=1:1) in 100 g of water, use a homogenizer to emulsify for 10 min to obtain an emulsion.

[0061] (3) transfer emulsion into 250ml three-necked flask equipped with reflux tube, nitrogen inlet, dropping funnel and mechanical stirring, first pass nitrogen for 15min to remove oxygen in the system, then under reflux tube condensation, heat up to 60 °C ℃, after keeping the water bath temperature constant for 30min of poly...

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Abstract

The invention belongs to the field of a phase change material technology for cool storage, and discloses an inorganic/organic composite casing layer nanometer phase-change capsule cool-storage fluid and a preparation method thereof. The preparation method comprises the following steps: hydrolysis and condensation are carried out for metal alkoxide, modification is carried out with an organosilicon coupling agent, modified metal oxide sol is obtained; a styrene monomer, an acrylic ester comonomer, a chain transferring agent, an initiator and an alkane core material are mixed for forming an oil phase, the oil phase is added into an emulsifier and deionized water for forming a water phase, homogeneous emulsification is carried out, and miniemulsion is obtained; the miniemulsion is heated to 40-80 DEG C, in situ polymerization is carried out for 10-50 minutes, the modified metal oxide sol is added drop by drop, and after a reaction, a composite casing layer nanometer phase change capsule emulsion is obtained; the emulsion is added into an antifreeze, water is added for dilution, and the product is obtained. Metal oxide and organic polymers are compounded into a casing layer; the product has the advantages of high heat conduction performance, high specific heat capacity and good mechanical stability at the same time, and the product can be used as phase-change cool-storage fluid for cool storage air-conditionings.

Description

technical field [0001] The invention belongs to the technical field of phase change cold storage materials, in particular to an inorganic / organic composite shell nano phase change capsule cold storage fluid and a preparation method. Background technique [0002] Air-conditioning phase-change cold storage is an effective means to realize the "peak shifting and valley filling" of the power grid. It can not only improve the cooling efficiency of the air-conditioning system, but also reduce environmental pollution. Traditional phase change cold storage materials, such as ice, eutectic salt, etc., in the cold storage system, the cold storage medium (phase change cold storage material) and the release medium (refrigerant or frozen water) are functionally separated, that is, the storage and transportation of cold energy It is completed by two materials, one material stores cold energy (first heat exchange), and then transfers cold energy to another fluid (second heat exchange). Du...

Claims

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Application Information

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IPC IPC(8): C08F212/08C08F220/18C08F2/26C08F2/30C08K3/36C08K9/06C09K5/06
CPCC08F212/08C08K3/36C08K9/06C09K5/066C08F220/1802C08F212/00C08F2/26C08F2/30C09K5/06Y02E60/14
Inventor 方玉堂付弯弯梁向晖汪双凤余慧敏谢鸿洲高学农张正国
Owner SOUTH CHINA UNIV OF TECH
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