CN108940147B - Polyethylene glycol/cellulose triacetate phase change microcapsule and preparation method thereof - Google Patents
Polyethylene glycol/cellulose triacetate phase change microcapsule and preparation method thereof Download PDFInfo
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- CN108940147B CN108940147B CN201810965585.9A CN201810965585A CN108940147B CN 108940147 B CN108940147 B CN 108940147B CN 201810965585 A CN201810965585 A CN 201810965585A CN 108940147 B CN108940147 B CN 108940147B
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- B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
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- B01J13/04—Making microcapsules or microballoons by physical processes, e.g. drying, spraying
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Abstract
The invention discloses a polyethylene glycol/cellulose triacetate phase change microcapsule and a preparation method thereof. The phase change microcapsule has a core material of polyethylene glycol, a wall material of cellulose triacetate, a diameter of 2-15 μm, and a phase change heat of 100-160J/g. The preparation method comprises the steps of dissolving polyethylene glycol and cellulose triacetate by taking dichloromethane as a solvent, and preparing the polyethylene glycol/cellulose triacetate phase-change microcapsule by spray drying. The novel polyethylene glycol phase change microcapsule material taking the cellulose triacetate as the wall material does not release formaldehyde in the using process, and the cellulose triacetate is easy to degrade. Compared with other preparation methods, the spray drying method using the dichloromethane as the solvent does not need an additional emulsifier, and the dichloromethane is easy to recover, so the preparation method is environment-friendly. The polyethylene glycol/ethyl cellulose phase change microcapsule has the particle size range of 2-15 mu m and the phase change heat of 100-160J/g, and can be widely applied to the preparation of phase change materials.
Description
Technical Field
The invention relates to the technical field of phase change microcapsules, in particular to a polyethylene glycol/cellulose triacetate phase change microcapsule and a preparation method thereof.
Background
Polyethylene glycol is a common phase change material, and has a wide phase change temperature change range and high phase change heat, so that the polyethylene glycol is widely concerned and researched. But the defects of easy leakage in the use process, large volume change in the phase change process, low heat conductivity and the like exist. In view of the above disadvantages, the microcapsule technology of using a film-forming material to coat a phase-change material to form a phase-change microcapsule can prevent the phase-change material from leaking and contacting with the external environment, control the volume change during phase change, and increase the heat transfer area. Therefore, phase change microcapsules have become the most developed class of composite phase change materials.
At present, the most common wall materials are high polymer materials such as melamine resin, urea resin and the like, and formaldehyde is released or is difficult to degrade in the using process, so that the environment is polluted, and the using requirements can not be met obviously.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the defects in the prior art, the invention aims to provide the polyethylene glycol/cellulose triacetate phase change microcapsule which has the advantages of easy degradation, no formaldehyde and the like; the invention also aims to provide a preparation method of the polyethylene glycol/cellulose triacetate phase change microcapsule. The invention also aims to provide an application of the polyethylene glycol/cellulose triacetate phase change microcapsule.
The technical scheme is as follows: in order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
a polyethylene glycol/cellulose triacetate phase change microcapsule is provided, wherein a core material is polyethylene glycol, a wall material is cellulose triacetate, the diameter is 2-15 μm, and the phase change heat is 100-160J/g.
The molecular weight of the polyethylene glycol is 800-8000.
The mass ratio of the cellulose triacetate to the polyethylene glycol is 1: 3-1: 5.
The preparation method of the polyethylene glycol/cellulose triacetate phase-change microcapsule comprises the steps of dissolving polyethylene glycol and cellulose triacetate by taking methylene chloride as a solvent, and preparing the polyethylene glycol/cellulose triacetate phase-change microcapsule by spray drying.
The preparation method of the polyethylene glycol/cellulose triacetate phase change microcapsule comprises the following steps:
1) adding cellulose triacetate and polyethylene glycol into dichloromethane, and stirring and dissolving at normal temperature to obtain a transparent and uniform solution;
2) conveying the solution obtained in the step 1) into a spray drying device through a peristaltic pump at the speed of 1.4-4.2 mL/min, and performing spray drying to obtain the polyethylene glycol/cellulose triacetate phase change microcapsule.
The mass ratio of the cellulose triacetate to the polyethylene glycol is 1: 3-1: 5.
In the step 2), the outlet temperature of spray drying is set to be 60-100 ℃, the pressure of compressed air is 0.14-0.18 MPa, and the air flow rate is 20-40 m3/h。
The molecular weight of the polyethylene glycol is 800-8000.
The polyethylene glycol/cellulose triacetate phase change microcapsule is applied to the preparation of phase change materials.
Has the advantages that: compared with the prior art, the polyethylene glycol/cellulose triacetate phase change microcapsule and the preparation method thereof have the advantages that:
1) the new polyethylene glycol phase change microcapsule material taking the cellulose triacetate as the wall material does not release formaldehyde in the using process, and the cellulose triacetate is easy to degrade.
2) Compared with other preparation methods, the spray drying method using the dichloromethane as the solvent does not need an additional emulsifier, and the dichloromethane is easy to recover, so the preparation method is environment-friendly.
3) The environment-friendly phase change microcapsule prepared by coating the phase change material with the cellulose is also an important way for realizing high-value utilization of the cellulose.
4) The polyethylene glycol/ethyl cellulose phase change microcapsule has the particle size range of 2-15 mu m and the phase change heat of 100-160J/g, and can be widely applied to the preparation of phase change materials.
Drawings
FIG. 1 is an optical microscope photograph of polyethylene glycol/cellulose triacetate phase change microcapsules of example 1;
FIG. 2 is an optical microscope photograph of the polyethylene glycol/cellulose triacetate phase change microcapsules of example 2;
FIG. 3 is an optical microscope photograph of the polyethylene glycol/cellulose triacetate phase change microcapsules of example 3.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
Adding cellulose triacetate and polyethylene glycol (molecular weight of 8000) at a mass ratio of 1: 3 (mass ratio of cellulose triacetate to polyethylene glycol, the same applies below) into dichloromethane, and stirring at room temperature for 3h to obtain a transparent and uniform solution. The inlet temperature of the spray drying device is set to be 100 ℃, the pressure of compressed air is 0.18MPa, and the air flow rate is set to be 30m3And/h, conveying the solution into a spray drying device through a peristaltic pump at the speed of 1.4mL/min, and performing spray drying to obtain the polyethylene glycol/cellulose triacetate phase change microcapsule.
An optical microscope image of the prepared polyethylene glycol/cellulose triacetate phase change microcapsule is shown in fig. 1, in the polyethylene glycol/cellulose triacetate phase change microcapsule, cellulose triacetate is arranged on the outer side, polyethylene glycol is arranged on the inner side, particles are spherical, the size is uniform, and the particle size range is 2-10 mu m. The phase transition heat of the microcapsules was measured to be 160J/g using a DSC200F1 differential scanning calorimeter.
Example 2
Adding cellulose triacetate and polyethylene glycol (molecular weight is 800) into dichloromethane at a mass ratio of 1: 5, and stirring at room temperature for 3h to obtain transparent and uniform solution. The inlet temperature of the spray drying device is set to be 60 ℃, the pressure of compressed air is 0.14MPa, and the air flow rate is set to be 40m3And/h, conveying the solution into a spray drying device through a peristaltic pump at the speed of 4.2mL/min, and performing spray drying to obtain the polyethylene glycol/cellulose triacetate phase change microcapsule.
An optical microscope image of the prepared polyethylene glycol/cellulose triacetate phase change microcapsule is shown in fig. 2, in the polyethylene glycol/cellulose triacetate phase change microcapsule, cellulose triacetate is arranged on the outer side, polyethylene glycol is arranged on the inner side, particles are spherical, the size is uniform, and the particle size range is 5-10 mu m. The phase transition heat of the microcapsules was measured to be 100J/g using a DSC200F1 differential scanning calorimeter.
Example 3
Adding cellulose triacetate and polyethylene glycol (molecular weight is 1000) in a mass ratio of 1: 4 into dichloromethane, and stirring at room temperature for 3h to obtain a transparent and uniform solution. Setting inlet temperature 8 of spray drying apparatus0 ℃, the pressure of compressed air is 0.16MPa, and the air flow rate is 20m3And/h, conveying the solution into a spray drying device through a peristaltic pump at the speed of 2.8mL/min, and performing spray drying to obtain the polyethylene glycol/cellulose triacetate phase change microcapsule.
An optical microscope image of the prepared polyethylene glycol/cellulose triacetate phase change microcapsule is shown in fig. 3, in the polyethylene glycol/cellulose triacetate phase change microcapsule, cellulose triacetate is arranged on the outer side, polyethylene glycol is arranged on the inner side, particles are spherical, the size is uniform, and the particle size range is 2-15 mu m. The phase transition heat of the microcapsules was measured to be 108J/g using a DSC200F1 differential scanning calorimeter.
Claims (4)
1. A polyethylene glycol/cellulose triacetate phase change microcapsule is characterized in that a core material of the phase change microcapsule is polyethylene glycol, a wall material is cellulose triacetate, the diameter is 2-15 mu m, and the phase change heat is 160J/g;
the preparation method of the polyethylene glycol/cellulose triacetate phase change microcapsule comprises the following steps:
1) adding cellulose triacetate and polyethylene glycol into dichloromethane, and stirring and dissolving at normal temperature to obtain a transparent and uniform solution;
2) conveying the solution obtained in the step 1) into a spray drying device through a peristaltic pump at the speed of 1.4-4.2 mL/min, setting the outlet temperature of spray drying to be 60-100 ℃, the pressure of compressed air to be 0.14-0.18 MPa and the air flow rate to be 20-40 m3And h, spray drying to obtain the polyethylene glycol/cellulose triacetate phase change microcapsule.
2. The polyethylene glycol/cellulose triacetate phase change microcapsule according to claim 1, wherein the polyethylene glycol has a molecular weight of 800 to 8000.
3. The polyethylene glycol/cellulose triacetate phase-change microcapsule according to claim 1, wherein the mass ratio of the cellulose triacetate to the polyethylene glycol is 1: 3 to 1: 5.
4. Use of the polyethylene glycol/cellulose triacetate phase change microcapsules of claim 1, 2 or 3 in preparing a phase change material.
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