A thermally conductive vibration isolation interface material

Abstract

The present invention discloses a heat-conducting vibration-isolating interface material, comprising a plurality of arrays of heat-conducting strips, wherein the interior of the heat-conducting strips comprises an inner core, the exterior of the inner core is covered with a backing adhesive layer, the exterior of the backing adhesive layer is bonded with a heat transfer layer, the exterior of the heat transfer layer is covered with an insulating layer, and the outer side of the heat-conducting strips is provided with a heat-conducting gasket, and the area of ​​the heat-conducting gasket is larger than the surface area of ​​a single heat-conducting strip. The device has the requirements of high vibration isolation rate, high temperature resistance, low thermal resistance, and mass production.

Description

Technical Field

[0001] The invention relates to the field of heat-conducting foam processing, and in particular to a heat-conducting vibration-isolating interface material. Background Art

[0002] In the case of shock-absorbing structures or vibration isolation, the equipment needs to be cooled by conduction, which requires an interface material that can both isolate vibration and transfer heat. The existing graphite-foam composite material basically meets the requirements of this use condition, but it has deficiencies in vibration isolation performance, temperature resistance, heat transfer performance and mass production processability.

[0003] A graphite thermal conductive foam with publication number CN205818554U can effectively prevent leakage caused by graphite powder falling in the gap of the machine, so it can effectively improve the actual working efficiency and the abnormal problems caused by graphite powder falling, but there are still the following problems:

[0004] 1. The commonly used middle foam material is PE, which cannot withstand high temperatures up to 110°C and has a low rebound rate at high temperatures;

[0005] 2. The interface contact thermal resistance is large. A common use method is to use the graphite bubble surface without adhesive on the outside, and contact the interface by pressure. There are many air gaps on the contact interface at the microscopic level, which increases the contact thermal resistance. Another common use method is to use ordinary adhesive on the surface for bonding, because the adhesive has poor heat transfer and high thermal resistance, which increases the contact thermal resistance;

[0006] 3. Large heat transfer resistance. The heat transfer path of traditional graphite foam is the graphite on the surface. Because the thickness of graphite is usually limited to less than 100um, the heat transfer cross-sectional area is small and the heat transfer resistance is large;

[0007] 4. Poor mass production processability. It cannot meet the needs of mass production. The graphite foam will scatter during the assembly process, which is not convenient for mass production. Summary of the invention

[0008] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a heat-conducting vibration-isolating interface material.

[0009] In order to achieve the above-mentioned object, the present invention adopts the following technical scheme: a thermally conductive vibration-isolating interface material, comprising a plurality of arrays of thermally conductive strips;

[0010] The interior of the thermal conductive strip includes an inner core, the outer portion of the inner core is covered with a back adhesive layer, the outer portion of the back adhesive layer is bonded with a heat transfer layer, and the outer portion of the heat transfer layer is covered with an insulating layer;

[0011] A thermally conductive pad is disposed on the outer side of the thermally conductive strip, and the area of ​​the thermally conductive pad is larger than the surface area of ​​a single thermally conductive strip.

[0012] As a further description of the above technical solution: the thermally conductive gasket covers the upper and lower surfaces or one of the surfaces of the thermally conductive strip, and the outside of the thermally conductive gasket is simultaneously connected to multiple groups of the thermally conductive strips.

[0013] As a further description of the above technical solution: a certain distance of gap is arranged between adjacent thermally conductive strips.

[0014] As a further description of the above technical solution: the heat transfer layer is a graphite film or a graphene film.

[0015] As a further description of the above technical solution: the inner core is a foamed silicone material with high porosity. As a further description of the above technical solution: the thermally conductive gasket is an acrylic-based thermally conductive gasket, and its thermal conductivity is greater than 3W / (m·K) and its hardness is less than 30HA.

[0016] As a further description of the above technical solution: the thickness of the heat transfer layer is 17 μm-100 μm.

[0017] As a further description of the above technical solution: the thickness of the thermal conductive gasket is 0.3mm-3mm.

[0018] As a further description of the above technical solution: the thermal conductive gasket is self-adhesive.

[0019] As a further description of the above technical solution: the material of the insulating layer is PET (polyethylene terephthalate).

[0020] The present invention has the following beneficial effects:

[0021] 1. The width of the heat-conducting strips of the present invention can be selected in different sizes according to the size and heat conductivity of the interface material. A gap is reserved between the strips to accommodate the compression deformation and prevent interference between the strips during the compression process, thereby ensuring a good compression rate and vibration isolation. The thermal interface material is composed of multiple arrays, thereby increasing the channels for heat transfer and enhancing the vertical heat transfer performance of the interface material.

[0022] 2. The inner core material of the present invention is a high-porosity foamed silica gel. Compared with the original PE material, it can withstand a high temperature of 120°C and the rebound rate will not be reduced. At the same time, it has a smaller compression force, a larger compression rate and a larger rebound rate, thereby ensuring the compression rate, compression force, vibration isolation and rebound rate effects of the interface material.

[0023] 3. The present invention covers the surface of the thermal strip array with a self-adhesive thermal gasket, and the thermal gasket is a self-adhesive acrylic substrate or a silicone substrate thermal gasket, and its thermal conductivity is greater than 3W / (m·K) and its hardness is less than 30HA, which reduces the interface contact thermal resistance between the interface material and the equipment, enhances the heat transfer performance in the horizontal direction, and enhances the overall reliability of the interface material. The thermal gasket covers or bonds the entire interface material as a whole to avoid scattering and optimize the mounting process. In the production process of the thermal interface material, it is more convenient to stick the thermal gasket than to stick the thermal double-sided tape on the thermal foam strip array, and it is easier to realize mass production process.

[0024] 4. The thermally conductive gasket of the present invention is a self-adhesive acrylic-based thermally conductive gasket, which has a high temperature resistance of above 120° C. and has high reliability compared to double-sided tape or adhesive backing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A cross-sectional view of a thermally conductive vibration-isolating interface material proposed by the present invention;

[0026] Figure 2 A thermally conductive vibration isolation interface material proposed by the present invention Figure 1 Schematic diagram of part A.

[0027] Legend:

[0028] 1. Thermal conductive strip; 2. Inner core; 3. Adhesive layer; 4. Heat transfer layer; 5. Insulation layer; 6. Thermal conductive gasket. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Reference Figure 1-Figure 2 , an embodiment provided by the present invention: a thermally conductive vibration isolation interface material, comprising a plurality of arrays of thermally conductive strips 1;

[0032] The interior of the heat-conducting strip 1 includes an inner core 2, the outer portion of the inner core 2 is covered with a back adhesive layer 3, the outer portion of the back adhesive layer 3 is bonded with a heat transfer layer 4, and the outer portion of the heat transfer layer 4 is covered with an insulating layer 5;

[0033] A thermally conductive pad 6 is disposed on the outer side of the thermally conductive strip 1 , and the area of ​​the thermally conductive pad 6 is larger than the surface area of ​​a single thermally conductive strip 2 .

[0034] The entire interface material is composed of a plurality of arrays of thermally conductive strips 1 and thermally conductive gaskets 6 bonded on the upper and lower surfaces or in between. A gap of a certain distance is set between two adjacent groups of thermally conductive strips 1 to accommodate the compression deformation of the thermally conductive strips 1 and prevent interference between adjacent thermally conductive strips 1. The inner core 2 of the thermally conductive strip 1 is made of high-porosity foamed silicone with a small compression force, a large compression rate and a rebound rate, thereby ensuring good compression rate and seismic isolation. At the same time, the existence of the gap allows heat to pass through the gap, thereby improving the vertical heat transfer performance of the interface material. Since the material of the inner core 2 is foamed silicone, the foamed silicone is resistant to high temperatures of 120°C and can still maintain its rebound rate at a temperature of 110°C.

[0035] Furthermore, the thermally conductive gasket 6 covers the upper and lower surfaces or one of the surfaces of the thermally conductive strip 2 , and the exterior of the thermally conductive gasket 6 is simultaneously connected to multiple groups of thermally conductive strips 1 .

[0036] Furthermore, a certain distance of gap is provided between adjacent heat conducting strips 1 .

[0037] Furthermore, the heat transfer layer 4 is a graphite film or a graphene film, which has good thermal conductivity.

[0038] Furthermore, the inner core 2 is a high-porosity foamed silicone material with a small compression force, a large compression rate and a large rebound rate, thereby meeting the high vibration isolation rate requirements, and the foamed silicone can withstand high temperatures of up to 120°C.

[0039] Furthermore, the thermally conductive gasket 6 is a thermally conductive gasket with an acrylic substrate or a silicone substrate, and its thermal conductivity is greater than 3W / (m·K) and its hardness is less than 30HA.

[0040] The thermally conductive gasket 6 has a self-adhesive acrylic substrate or a silicone substrate. The softness and gap-filling ability of the thermally conductive gasket 6 can significantly reduce the contact thermal resistance between the interface material and the interface. The thermally conductive gasket 6 increases the cross-sectional area of ​​the heat transfer channel in the horizontal direction, significantly reducing the thermal resistance of the heat transfer in the horizontal direction. The thermally conductive gasket 6 wraps or bonds the discrete thermally conductive strips 1 as a whole, and will not scatter after the outer protective film is torn off, thereby affecting the processability of the interface material during use, and can be efficiently mass-produced. In the production process of thermally conductive interface materials, it is more convenient to stick the thermally conductive gasket 6 than to stick a thermally conductive double-sided tape on an array of thermally conductive foam strips, and it is easier to realize mass production process. Fourth, the thermally conductive gasket is resistant to high temperatures above 120°C and has high reliability, while the double-sided tape or adhesive backing in existing materials are difficult to meet high temperatures and high reliability.

[0041] Furthermore, the thickness of the heat transfer layer 4 is 17μm-100μm. The heat transfer layer 4 is made of graphite or graphene material. Compared with the existing graphite or graphene with a thickness of less than 100 microns, the graphite or graphene layer of this material has a thickness of 17μm-100μm, has a larger heat transfer area, and has a smaller heat transfer resistance.

[0042] Furthermore, the thickness of the thermally conductive pad 6 is 0.3 mm-3 mm.

[0043] Furthermore, the thermally conductive pad 6 has self-adhesiveness.

[0044] Furthermore, the material of the insulating layer 5 is PET (polyethylene terephthalate).

[0045] Working principle: When the product is in use, the entire interface material is composed of multiple groups of arrays of thermally conductive strips 1 and thermally conductive gaskets 6 bonded on the upper and lower surfaces or in between. A gap of a certain distance is set between two adjacent groups of thermally conductive strips 1 to accommodate the compression deformation of the thermally conductive strips 1 and prevent interference between adjacent thermally conductive strips 1. The inner core 2 of the thermally conductive strip 1 is made of high-porosity foamed silicone with a small compression force, large compression rate and rebound rate, thereby ensuring good compression rate and seismic isolation. At the same time, the existence of the gap allows heat to pass through the gap, thereby improving the vertical heat transfer performance of the interface material. Since the material of the inner core 2 is foamed silicone, the foamed silicone is resistant to high temperatures of 120°C and can still maintain its rebound rate at a temperature of 110°C.

[0046] The thermally conductive gasket 6 has a self-adhesive acrylic substrate or a silicone substrate. The softness and gap-filling ability of the thermally conductive gasket 6 can significantly reduce the contact thermal resistance between the interface material and the interface. The thermally conductive gasket 6 increases the cross-sectional area of ​​the heat transfer channel in the horizontal direction, significantly reducing the thermal resistance of the heat transfer in the horizontal direction. The thermally conductive gasket wraps or bonds the discrete thermally conductive strips 1 as a whole, and will not scatter after the outer protective film is torn off, thereby affecting the processability of the interface material during use, and can be efficiently mass-produced. In the production process of thermally conductive interface materials, it is more convenient to stick a thermally conductive gasket 6 than to stick a thermally conductive double-sided tape on an array of thermally conductive foam strips, and it is easier to realize mass production process. The thermally conductive gasket is resistant to high temperatures above 120°C, and has high reliability compared to the double-sided tape or adhesive backing in existing materials.

[0047] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A thermally conductive vibration isolation interface material, characterized in that: A heat conducting strip (1) comprising a plurality of arrays; The interior of the thermally conductive strip (1) comprises an inner core (2), the outer portion of the inner core (2) is covered with a back adhesive layer (3), the outer portion of the back adhesive layer (3) is bonded with a heat transfer layer (4), and the outer portion of the heat transfer layer (4) is covered with an insulating layer (5); A thermally conductive pad (6) is provided on the outer side of the thermally conductive strip (1), and the area of ​​the thermally conductive pad (6) is larger than the surface area of ​​a single thermally conductive strip (1). A certain distance of gap is provided between adjacent thermally conductive strips (1), the thermally conductive gasket (6) covers the upper and lower surfaces or one of the surfaces of the thermally conductive strips (1), and the outside of the thermally conductive gasket (6) is simultaneously connected to multiple groups of the thermally conductive strips (1).

2. A thermally conductive vibration isolation interface material according to claim 1, characterized in that: The heat transfer layer (4) is a graphite film or a graphene film.

3. The thermally conductive vibration-isolating interface material according to claim 1, characterized in that: The inner core (2) is made of foamed silica gel material with high porosity.

4. The thermally conductive vibration-isolating interface material according to claim 1, characterized in that: The thermally conductive pad (6) is an acrylic-based thermally conductive pad, and its thermal conductivity is greater than 3W / (m·K) and its hardness is less than 30HA.

5. The thermally conductive vibration-isolating interface material according to claim 1, characterized in that: The thickness of the heat transfer layer (4) is in the range of 17 μm to 100 μm.

6. The thermally conductive vibration-isolating interface material according to claim 1, characterized in that: The thickness of the thermally conductive pad (6) is in the range of 0.3 mm to 3 mm.

7. The thermally conductive vibration-isolating interface material according to claim 1, characterized in that: The thermally conductive pad (6) is self-adhesive.

8. The thermally conductive vibration-isolating interface material according to claim 1, characterized in that: The material of the insulating layer (5) is PET (polyethylene terephthalate).

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