CN112625452B - Phase change energy storage silicone grease gasket for electronic equipment and preparation method thereof - Google Patents
Phase change energy storage silicone grease gasket for electronic equipment and preparation method thereof Download PDFInfo
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- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
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- C08J2391/00—Characterised by the use of oils, fats or waxes; Derivatives thereof
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- C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
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- C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
- C08J2483/04—Polysiloxanes
- C08J2483/07—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
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Abstract
The invention relates to the field of thermal interface materials, in particular to a phase change energy storage silicone grease gasket for electronic equipment and a preparation method thereof, wherein the phase change energy storage silicone grease gasket comprises the following components: 10-20 parts of vinyl silicone oil, 0.1-1 part of hydrogen-containing silicone oil, 0.1-0.3 part of catalyst, 0.1-2 parts of silane coupling agent and 20-200 parts of phase-change microcapsule; the raw materials are stirred and mixed by a stirrer according to the formula amount, a catalyst is added in the stirring process to prepare a paste, and the phase change energy storage silicone grease gasket is obtained after the paste is solidified at high temperature. Compared with the prior art, the phase change microcapsule is added in the preparation process of the silicone grease gasket, and the coupling agent capable of promoting the compatibility of the phase change microcapsule shell and the silicone oil is added, so that the energy storage silicone grease gasket with excellent performance is prepared; when the working temperature of the electronic device is rapidly increased to be higher than the melting point, the solid gasket is subjected to phase change to become liquid, so that redundant energy is stored, the integral stability of the electronic device can be kept, redundant heat can be effectively stored in time, and the waste of energy is reduced.
Description
Technical Field
The invention relates to the field of preparation and application of thermal interface materials, in particular to a phase change energy storage silicone grease gasket for electronic equipment and a preparation method thereof.
Background
The thermal interface material can be filled in air gaps of the heat conducting element and the heat radiating element to realize effective heat transfer, and plays an extremely important role in a plurality of fields of electronics, electricity, aviation, aerospace and the like. There are many kinds of thermal interface materials, and most of them, silicone grease gaskets occupy the market of thermal interfaces because of their simple and easy-to-handle preparation method and excellent characteristics.
With the rapid development of the miniaturization of electronic devices, a series of electronic fast charging devices, such as flash charging chargers of children watches and mobile phones in video calls, release a large amount of heat in a short time, and at the moment, materials with good heat storage performance are required to store the released energy and provide corresponding energy when needed. The traditional heat-conducting silicone grease gasket generally uses inorganic heat-conducting filler to improve the heat conductivity coefficient, but the traditional heat-conducting silicone grease gasket can only transfer heat and cannot absorb stored energy. The phase change material utilizes the solid-liquid phase change characteristic thereof, and improves the heat conduction characteristic of the phase change thermal interface material through the fusion with the silicone oil, thereby realizing the heat management function. The phase-change thermal interface material integrates the dual advantages of a heat-conducting gasket and heat-conducting paste, has the same advantages as a common heat-conducting gasket before reaching the phase-change temperature, has good elasticity and plasticity, is relatively easy to assemble and operate, and does not have the problems of overflowing and the like. However, when the operating temperature of the electronic device is raised above the melting point, the electronic device will be transformed into liquid, thereby effectively wetting the thermal interface, filling the interface gap to the maximum extent, and greatly reducing the thermal resistance between the two material interfaces. In addition, the phase change thermal interface material also has the effect of energy buffering, and heat is absorbed or released through the phase change process.
Disclosure of Invention
The invention aims to solve the problems and provides a phase-change energy-storage silicone grease gasket which is used for filling a radiator gap of electronic equipment and improving the service life and stability of elements of the electronic equipment; by optimizing the formula design and the preparation method, the heat conduction is enhanced, and meanwhile, a large amount of heat released by equipment is stored, so that the design requirement of a product is met.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a phase change energy storage silicone grease gasket for electronic equipment comprises the following components in parts by weight:
10-20 parts of vinyl silicone oil;
0.1-1 part of hydrogen-containing silicone oil;
20-200 parts of phase change microcapsules;
0.1-3 parts of a coupling agent;
0.1-0.3 part of catalyst.
Preferably, the vinyl silicone oil has an ethylene content of 0.01 to 0.3% and a viscosity of 100 mpa.s.
Preferably, the active hydrogen content of the hydrogen-containing silicone oil is 0.1-0.5%.
Preferably, the inner core of the phase-change microcapsule is paraffin, the outer shell of the phase-change microcapsule is melamine, and the phase-change temperature is 137-147 ℃.
Preferably, the coupling agent is one or a mixture of KH-540, KH-792, Si-602, A-151 and A-172.
Preferably, the catalyst is a platinum catalyst.
A preparation method of a phase change energy storage silicone grease gasket for electronic equipment comprises the following steps:
s1, adding the vinyl silicone oil, the hydrogen-containing silicone oil, the phase change microcapsule and the coupling agent in a formula ratio into a powerful high-speed stirrer, and stirring for 0.25h at a controlled rotation speed of 120-160 rpm;
s2, adding a platinum catalyst into the obtained mixture while stirring, and stirring for 0.25h at a controlled rotation speed of 60-80 rpm;
s3, after uniformly stirring, vacuumizing to remove bubbles to obtain a paste material;
s4, placing the paste material in the middle of a PET release film, rolling the paste material into a paste sheet with the thickness of 1-5 mm, curing the paste sheet at 100-130 ℃ for 0.5h,
and S5, cutting the solidified paste into paste pieces with the specification of 100mm multiplied by 100mm to obtain the phase change energy storage silicone grease gasket.
The invention has the beneficial effects that:
according to the invention, the phase change microcapsule is added on the basis of the traditional silicone grease gasket preparation process, and the coupling agent for promoting the phase change microcapsule shell to be compatible with the silicone oil is added in the preparation process, so that the energy storage silicone grease gasket with excellent performance is prepared, and when the working temperature of an electronic device is rapidly increased to be higher than the melting point, the solid gasket is subjected to phase change to be in a liquid state, so that redundant energy is stored; the integral stability of the electronic equipment can be kept, the redundant heat can be effectively stored in time, and the waste of energy is reduced.
Drawings
FIG. 1 is a Scanning Electron Microscope (SEM) morphology of the paste before the phase change energy storage silicone grease pad is cured in example 3 of the present invention;
FIG. 2 is a Scanning Electron Microscope (SEM) morphology of phase change microcapsules in example 3 of the invention;
FIG. 3 is a phase change characteristic curve diagram of the phase change energy storage silicone grease gasket manufactured by the method of the present invention and the energy storage gasket manufactured by the traditional method under a DSC differential thermal scanning calorimetry analyzer.
Detailed Description
In order to better explain the present invention, the detailed description of the present invention is made below with reference to the accompanying drawings and examples.
Example (b): see fig. 1-3.
A phase change energy storage silicone grease gasket for electronic equipment and a preparation method thereof are disclosed, wherein the phase change energy storage silicone grease gasket comprises the following components in parts by weight: 10-20 parts of vinyl silicone oil; 0.1-1 part of hydrogen-containing silicone oil; 20-200 parts of phase change microcapsules; 0.1-3 parts of a coupling agent; 0.1-0.3 part of catalyst; the preparation process comprises the following steps:
s1, adding the vinyl silicone oil, the hydrogen-containing silicone oil, the phase change microcapsule and the coupling agent in a formula ratio into a powerful high-speed stirrer, and stirring for 0.25h at a controlled rotation speed of 120-160 rpm;
s2, adding a platinum catalyst into the obtained mixture while stirring, and stirring for 0.25h at a controlled rotation speed of 60-80 rpm;
s3, after uniformly stirring, vacuumizing to remove bubbles to obtain a paste material;
s4, placing the paste material in the middle of a PET release film, rolling the paste material into a paste sheet with the thickness of 1-5 mm, curing the paste sheet at 100-130 ℃ for 0.5h,
and S5, cutting the solidified paste into paste pieces with the specification of 100mm multiplied by 100mm to obtain the phase change energy storage silicone grease gasket.
Example 1 (comparative):
adding 15 parts of vinyl silicone oil, 0.5 part of hydrogen-containing silicone oil, 80 parts of phase change microcapsule and 0.1 part of silane KH570 coupling agent into a powerful high-speed stirrer, stirring for 0.25h at the controlled rotation speed of 140rpm, then adding 0.15 part of platinum catalyst while stirring, and stirring for 0.25h at the controlled rotation speed of 70 rpm; after being stirred uniformly, the mixture is vacuumized to remove bubbles, and a paste material is obtained; placing the paste material in the middle of a PET release film, rolling the paste material into a paste sheet with the thickness of 3 mm, curing the paste sheet at 115 ℃ for 0.5h, and cutting the solidified paste material into paste sheets with the specification of 100mm multiplied by 100mm to obtain the traditional energy storage gasket.
Example 2:
taking 10 parts of vinyl silicone oil, 0.1 part of hydrogen-containing silicone oil, 20 parts of phase change microcapsule and 0.1 part of silane KH-540 coupling agent, adding into a strong high-speed stirrer, stirring for 0.25h at the controlled rotation speed of 120rpm, then adding 0.1 part of platinum catalyst while stirring, and stirring for 0.25h at the controlled rotation speed of 60 rpm; after being stirred uniformly, the mixture is vacuumized to remove bubbles, and a paste material is obtained; and placing the paste material in the middle of a PET release film, rolling the paste material into a paste sheet with the thickness of 1-5 mm, curing the paste sheet at 100-130 ℃ for 0.5h, and cutting the solidified paste material into paste sheets with the specification of 100mm multiplied by 100mm to obtain the phase change energy storage silicone grease gasket.
Example 3:
adding 15 parts of vinyl silicone oil, 0.5 part of hydrogen-containing silicone oil, 80 parts of phase change microcapsule and 0.3 part of silane KH-540 coupling agent into a powerful high-speed stirrer, stirring for 0.25h at the controlled rotation speed of 140rpm, and then adding 0.15 part of platinum catalyst while stirring, and stirring for 0.25h at the controlled rotation speed of 70 rpm; after being stirred uniformly, the mixture is vacuumized to remove bubbles, and a paste material is obtained; and placing the paste material in the middle of a PET release film, rolling the paste material into a paste sheet with the thickness of 3 mm, curing the paste sheet at 115 ℃ for 0.5h, and cutting the solidified paste material into paste sheets with the specification of 100mm multiplied by 100mm to obtain the phase change energy storage silicone grease gasket.
Example 4:
adding 20 parts of vinyl silicone oil, 1 part of hydrogen-containing silicone oil, 140 parts of phase change microcapsule and 0.6 part of silane KH-540 coupling agent into a powerful high-speed stirrer, stirring for 0.25h at the controlled rotation speed of 160rpm, adding 0.3 part of platinum catalyst, stirring at the controlled rotation speed of 80rpm, and stirring for 0.25 h; after being stirred uniformly, the mixture is vacuumized to remove bubbles, and a paste material is obtained; and placing the paste material in the middle of a PET release film, rolling the paste material into a paste sheet with the thickness of 5 mm, curing the paste sheet at 130 ℃ for 0.5h, and cutting the solidified paste material into paste sheets with the specification of 100mm multiplied by 100mm to obtain the phase change energy storage silicone grease gasket.
Referring to fig. 1-2, fig. 1 is a Scanning Electron Microscope (SEM) image of the paste before curing in example 3; fig. 2 is a shape diagram of the phase change microcapsule used in example 3 under a Scanning Electron Microscope (SEM), and it can be seen from the diagram that the energy storage filler in the mixture, i.e., the phase change microcapsule and the vinyl silicone oil, are well fused together under the action of the coupling agent, and the vinyl silicone oil completely wraps the microcapsule shell, which indicates that the phase change microcapsule and the vinyl silicone oil can be effectively fused according to the method of the present invention, so that the prepared energy storage gasket has good heat storage capacity, and the phase change capsule is ensured not to be separated from the silicone oil after high temperature phase change.
Referring to fig. 3, fig. 3 is a phase change characteristic curve diagram of the phase change energy storage silicone grease gasket prepared by the method of the present invention (example 3) and the energy storage gasket prepared by the conventional method (example 1) under a DSC differential thermal scanning calorimetry analyzer, and it can be seen from the diagram that the phase change range of the phase change energy storage silicone grease gasket prepared by the method of the present invention is 39.87-49.12 ℃, the peak value is 47.05 ℃, the latent heat of phase change is 147.2J/g, while the phase change region of the heat storage gasket prepared by the conventional method is smaller; the method disclosed by the invention has the advantage that the heat storage capacity of the prepared energy storage silicone oil gasket can be effectively improved by adding a proper and specific coupling agent in the preparation process of the energy storage silicone oil gasket.
In conclusion, the method of the invention prepares the energy storage silicone grease gasket with excellent performance by adding the phase change microcapsule on the basis of the traditional silicone grease gasket preparation process and adding the coupling agent for promoting the phase change microcapsule shell to be compatible with the silicone oil in the preparation process, and when the working temperature of the electronic device is rapidly increased to be higher than the melting point, the solid gasket is subjected to phase change to be liquid so as to store redundant energy; the integral stability of the electronic equipment can be kept, the redundant heat can be effectively stored in time, and the waste of energy is reduced.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structures or equivalent transformations made by the present specification and the attached drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (3)
1. A preparation method of a phase change energy storage silicone grease gasket for electronic equipment is characterized in that the phase change energy storage silicone grease gasket comprises the following components in parts by weight: 15 parts of vinyl silicone oil; 0.5 part of hydrogen-containing silicone oil; 80 parts of phase change microcapsules; 0.3 part of KH-540 coupling agent; 0.15 part of a platinum catalyst;
the preparation method of the phase change energy storage silicone grease gasket comprises the following steps:
s1, adding the vinyl silicone oil, the hydrogen-containing silicone oil, the phase change microcapsule and the KH-540 coupling agent in parts by weight into a powerful high-speed stirrer, and stirring for 0.25h at the controlled rotation speed of 120-160 rpm;
s2, adding a platinum catalyst into the obtained mixture while stirring, controlling the rotating speed to be 60-80 rpm, and stirring for 0.25 h;
s3, after uniformly stirring, vacuumizing to remove bubbles to obtain a paste material;
s4, placing the paste material in the middle of a PET release film, rolling the paste material into a paste material sheet with the thickness of 1-5 mm, and curing the paste material at 100-130 ℃ for 0.5 h;
and S5, cutting the solidified paste into paste pieces with the specification of 100mm multiplied by 100mm to obtain the phase change energy storage silicone grease gasket.
2. The method for preparing a phase change energy storage silicone grease pad for electronic equipment as claimed in claim 1, wherein the vinyl silicone oil has an ethylene content of 0.01-0.3% and a viscosity of 100 mPa-s.
3. The method for preparing the phase-change energy-storage silicone grease gasket for the electronic equipment as claimed in claim 1, wherein the active hydrogen content of the hydrogen-containing silicone oil is 0.1-0.5%.
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| CN113698771A (en) * | 2021-09-02 | 2021-11-26 | 应急管理部四川消防研究所 | Self-temperature-adaptive flame-retardant organic silicon foam sealing gasket and preparation method thereof |
| CN115331549A (en) * | 2022-08-01 | 2022-11-11 | 武汉华星光电半导体显示技术有限公司 | Flexible display panel and electronic device |
| CN115746569A (en) * | 2022-12-02 | 2023-03-07 | 锐腾新材料制造(苏州)有限公司 | Energy storage encapsulating material |
| CN116120754A (en) * | 2022-12-27 | 2023-05-16 | 深圳中诺材料技术有限公司 | Preparation method of heat conduction and heat storage structural member of electronic product |
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