WO2012016465A1 - 一种导热绝缘材料、导热绝缘片及其制备方法 - Google Patents

一种导热绝缘材料、导热绝缘片及其制备方法 Download PDF

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WO2012016465A1
WO2012016465A1 PCT/CN2011/074182 CN2011074182W WO2012016465A1 WO 2012016465 A1 WO2012016465 A1 WO 2012016465A1 CN 2011074182 W CN2011074182 W CN 2011074182W WO 2012016465 A1 WO2012016465 A1 WO 2012016465A1
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conductive insulating
thermally conductive
weight
parts
group
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PCT/CN2011/074182
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English (en)
French (fr)
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汪友森
赵敬棋
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天津莱尔德电子材料有限公司
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Publication of WO2012016465A1 publication Critical patent/WO2012016465A1/zh
Priority to US13/759,741 priority Critical patent/US9321949B2/en

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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K5/00Heat-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
    • C09K5/08Materials not undergoing a change of physical state when used
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00Use of inorganic substances as compounding ingredients
    • C08K3/01Use of inorganic substances as compounding ingredients characterized by their specific function
    • C08K3/013Fillers, pigments or reinforcing additives
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00Compositions 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; Compositions of derivatives of such polymers
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00Compositions 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; Compositions of derivatives of such polymers
    • C08L83/04Polysiloxanes
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K5/00Heat-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
    • C09K5/08Materials not undergoing a change of physical state when used
    • C09K5/14Solid materials, e.g. powdery or granular
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00Constructional details common to different types of electric apparatus
    • H05K7/20Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2039Modifications to facilitate cooling, ventilating, or heating characterised by the heat transfer by conduction from the heat generating element to a dissipating body

Definitions

  • Thermal conductive insulating material thermal conductive insulating sheet and preparation method thereof
  • the present invention relates to a thermally conductive insulating material, a thermally conductive insulating sheet, and a method of preparing the thermally conductive insulating material and the thermally conductive insulating sheet. Background technique
  • the heat dissipation effect is better, and a material capable of conducting heat is required to be filled between the heat sink and the electronic component.
  • Ordinary thermal grease and phase change materials have good thermal conductivity, but electrical insulation is poor and cannot be used in applications where high insulation is required.
  • Soft thermal gap fillers although they have a certain electrical insulation, cannot be used in applications where high insulation is required, and such materials are only suitable for low pressure applications and are not suitable for applications such as high power supplies and automobiles.
  • the thermal and insulating thermal insulation material can solve the problem of heat conduction under high insulation conditions.
  • the thermal insulation material can effectively connect the device and the heat sink, provide heat conduction channels to reduce the thermal resistance, and good electrical insulation performance can be guaranteed.
  • the device is operating normally.
  • the conventional thermal conductive insulating material is a fully cured silicone composite material, which is generally made of a silicone resin as a base material, and thermally conductive ceramic particles such as alumina, aluminum nitride, or zinc oxide are used as a filler.
  • the cured silicone surface is not tacky, it is easy to slip off during installation of the insulating material to the heat sink or device during use, especially when operating on a vertical plane.
  • the thermal conductivity of the double-sided tape is low, so that the heat conduction effect of the entire thermally conductive insulating material is lowered.
  • the current process is difficult to use adhesive tape on both sides of the thermal conductive material to make the two sides of the material sticky, thereby limiting the range of use of the thermal insulation material.
  • One invention of the present invention is to provide a thermally conductive insulating material, a thermally conductive insulating sheet, and a method of preparing the thermally conductive insulating material and the thermally conductive insulating sheet to solve one or more problems existing in the prior art.
  • a thermally conductive insulating material which is mainly composed of the following components: 4 to 40 parts by weight of a polymer matrix material; 1 to 20 parts by weight of a tackifying additive, the tackifying additive A reactive group having the same or similar reactivity as at least one of the curing reactive groups in the polymer matrix material; and 40 to 85 parts by weight of thermally conductive insulating particles.
  • a thermally conductive insulating sheet comprising: a supporting film; and a thermally conductive insulating material coated on the supporting film, the thermally conductive insulating material mainly composed of the following components: 4 40 parts by weight of a polymer matrix material; 1 to 20 parts by weight of a tackifying additive containing a reactive group similar or similar to at least one curing reactive group in the polymer matrix material And 40 to 85 parts by weight of thermally conductive insulating particles.
  • a method of preparing a thermally conductive insulating material comprising the steps of: providing 4 to 40 parts by weight of an uncured polymeric matrix material and 1 to 20 parts by weight of a tackifying additive, and The polymer matrix material and the tackifying additive are uniformly mixed, wherein the tackifying additive contains a reactive group which is the same as or similar to at least one curing reactive group in the polymer matrix material; and provides 40 to 85 parts by weight.
  • Thermal conductive insulating particles and uniformly adding the thermally conductive insulating particles to the mixed polymer base material and the thickening additive; and a mixture of the polymer base material and the thickening additive to which the thermally conductive insulating particles are added Curing is carried out.
  • a method of preparing a thermally conductive insulating sheet comprising the steps of: providing 4 to 40 parts by weight of an uncured polymer matrix material and 1 to 20 parts by weight of a tackifying additive, and The polymer matrix material and the viscosity-increasing additive are uniformly mixed, wherein the viscosity-increasing The additive contains the same or similar reactive groups as at least one of the curing reactive groups in the polymer matrix material; 40 to 85 parts by weight of thermally conductive insulating particles are provided, and the thermally conductive insulating particles are uniformly added to the mixing The polymer matrix material and the adhesion promoting additive; providing a support film, coating a mixture of the polymer matrix material and the adhesion promoter added with the heat conductive insulating particles on the support film; The mixture coated on the support film is subjected to solidification molding.
  • the above polymer base material is a material suitable for use between an electronic component and a heat sink.
  • the polymer matrix material may be selected from the group consisting of vinyl silicone resin, polyisobutylene polymer, silicone rubber, polyurethane, methyl methacrylate, organopolysiloxane, acrylate, and polyamide resin.
  • the tackifying additive may be selected from one or more of MQ silicone resin, petroleum rosin, silicone resin, polyol, ethyl acrylate, rosin and vinyl phenyl acetate resin.
  • the thermally conductive insulating particles may be selected from one or more of the group consisting of alumina, boron nitride, aluminum nitride, magnesium oxide, and zinc oxide.
  • the support membrane is selected from the group consisting of fiberglass cloth, PEN or PI.
  • the thermally conductive insulating material of the embodiment of the invention has both good thermal and thermal insulation properties and is viscous, and can be adhered between the heat sink and the electronic component without using double-sided tape.
  • the thermally conductive insulating material in the embodiment of the present invention does not have an additional process such as corona introduced for the use of the tape, thereby avoiding damage to the insulating property of the material, and also overcomes the problem that the thermal conductivity of the tape is low and affects the overall thermal conductivity of the product.
  • the thermally conductive insulating material of the present invention can better achieve surface contact with the heat sink and the device under the premise of ensuring insulation, and provides better heat conduction.
  • the thermally conductive insulating material provided by the embodiments of the present invention is mainly composed of the following materials: a polymer matrix material, an additive for providing viscosity (which may be referred to as a tackifying additive), and a thermally conductive insulating particle.
  • a polymer matrix material an additive for providing viscosity
  • a thermally conductive insulating particle a thermally conductive insulating particle.
  • the present invention mainly forms a thermally conductive insulating material by mixing an elastic polymer matrix material and a rigid tackifying additive and filling the thermally conductive insulating particles.
  • the tackifying additive may have a reactive group that provides viscosity (such as a hydroxyl functional group or other functional group capable of providing viscosity), and also has a reactive group similar or similar to at least one curing reactive group in the polymeric matrix material. (such as vinyl, etc.) so that a curing cross-linking reaction can occur with the matrix material.
  • a reactive group that provides viscosity such as a hydroxyl functional group or other functional group capable of providing viscosity
  • a reactive group similar or similar to at least one curing reactive group in the polymeric matrix material such as vinyl, etc.
  • the elastic polymer matrix material may be a polymer resin or other polymer material such as a polymer.
  • the tackifier may be, for example, a low molecular polymer such as a low molecular weight resin or other low molecular material, but is not limited thereto.
  • the polymer matrix material is a vinyl silicone resin
  • the tackifying additive is a vinyl MQ silicone resin
  • the thermally conductive insulating material comprises: 4 parts by weight of vinyl silicone resin, 1 part by weight of vinyl MQ silicone resin, and 40 parts by weight of alumina particles having different particle sizes.
  • the thermally conductive insulating material comprises: 20 parts by weight of vinyl silicone resin, 10 parts by weight of vinyl MQ silicone resin, and 70 parts by weight of alumina particles having different particle sizes.
  • the thermally conductive insulating material comprises: 40 parts by weight of vinyl silicone resin, 20 parts by weight of vinyl MQ silicone resin, and 85 parts by weight of alumina particles having different particle sizes.
  • the parts by weight of the above components are merely examples, and the present invention is not limited to the weight parts of the above components.
  • the thermally conductive insulating material of the present embodiment may comprise 4 to 40 parts by weight of a vinyl silicone resin, 1 to 20 parts by weight of a vinyl MQ silicone resin, and 40 to 85 parts by weight of thermally conductive insulating particles.
  • the present invention is not limited to this preferred case, but a reasonable change in the content of each component can be carried out based on actual needs and limited experiments.
  • the vinyl MQ silicone resin has a hydroxyl functional group, and the vinyl MQ silicone resin also has the same reactive group as the curing reactive group of the vinyl silicone resin, that is, an unsaturated double bond.
  • the thermally conductive insulating particles may be one or more metal oxides and/or metal nitride particles, for example, one or more selected from the group consisting of alumina, boron nitride, aluminum nitride, magnesium oxide, and zinc oxide.
  • Thermal conduction The particle diameter of the insulating particles can be, for example, 1 to 30 ⁇ m, but is not limited thereto.
  • thermally conductive insulating particles one or more thermally conductive insulating particles of uniform particle size may be selected, or a combination of different particle sizes of one or more metal oxides and/or metal nitride particles may be selected, for example A combination of 10 to 30 micron alumina particles and 1 to 10 micron boron nitride particles can be selected.
  • the numbers recited herein are only preferred examples, and it is entirely possible to select thermally conductive insulating particles having a wider or narrower particle size range depending on actual needs.
  • the thermally conductive insulating particles are uniformly dispersed therein, and then the mixed material is cured to form a good thermal conductive insulating property.
  • the viscous thermally conductive insulating material adheres well between the electronic component and the heat sink without the aid of double-sided tape or corona treatment.
  • thermally conductive insulating material of the present embodiment has good thermal conductive insulating properties and has viscosity (also called pressure sensitive adhesive, that is, viscosity is sensitive to pressure), and can be adhered. It is attached between the heat sink and the electronic components without using double-sided tape, thus overcoming the problem that the thermal conductivity of the tape is low and affects the overall thermal conductivity of the product.
  • Samples 1 to 3 of the present invention are respectively thermally conductive insulating material products of the present invention in which different weight parts of vinyl MQ silicone resin are added.
  • the content of the vinyl silicone resin as the base material was 20 parts by weight
  • the content of the vinyl MQ silicone resin was 2, 4 and 6 parts by weight, respectively
  • the thermally conductive insulating particles (alumina) The content is 80 parts. That is, the ratio of the MQ silicone resin to the vinyl silicone resin in the sample 1 to the inventive sample of the present invention was 5 wt% and 10 wt% P 15 wt%, respectively.
  • the ordinary sample prepared by itself was made by using the same weight part of the vinyl silicone resin and the same part by weight of the thermally conductive insulating particles (alumina) as the inventive sample 1 to the inventive sample 3. The sample is formed. That is, the treatment in the "normal sample prepared by itself” did not have the vinyl MQ silicone resin, and the other components were the same as those of the inventive sample 1 to the inventive sample 3. Further, the Dielectric breakdown voltages of the inventive samples 1 to 3 of the present invention are respectively for the respective samples. Table 1.
  • the thermal resistance of the inventive samples 1 to 3 of the MQ silicone resin was slightly increased, and the thermal resistance of the samples 2 and 3 was lowered, even lower than the thermal resistance of the "normal sample”.
  • the thermal resistance of the inventive samples 1 to 3 to which the MQ silicone resin was added in the present embodiment was lowered as compared with the "self-prepared ordinary sample” to which the MQ silicone resin was not added, and the dielectric breakdown voltage was increased, and It also has a viscosity, that is, after the addition of MQ silicone resin, the thermal conductive insulation performance is improved and it is sticky.
  • the conductive insulating material to which the MQ silicone resin is added in the embodiment of the present invention can be disposed between the heat sink and the electronic component as a heat conductive insulating material of the electronic component, and since the material itself has a viscosity, the double-sided tape can be used. Installed between the heat sink and electronic components. Moreover, by adjusting the weight ratio of the polymer (MQ silicone resin) as a tackifier, it is possible to obtain a very good thermal insulation effect (even superior to the existing thermally conductive insulating material without double-sided tape) and very good Sticky effect (even better than double-sided tape).
  • a reactive group such as a hydroxyl group having a viscosity and having a group capable of reacting with a vinyl silicone resin is added to a matrix resin (vinyl silicone resin) of an uncured elastomeric polymer (not The saturated double bond polymer (MQ silicone resin), when the matrix resin is cured, the low molecular weight polymer can be cross-linked with the matrix resin to complete the crosslinked network.
  • the cured material may have a certain viscosity due to the addition of the low molecular weight polymer, and the size of the viscosity may be adjusted according to the addition ratio of the low molecular weight polymer.
  • the entire material process does not receive any influence and additional steps, and does not adversely affect the thermal insulation properties of the final product.
  • In situ means that the addition is done during the preparation process without the need to introduce additional materials or processes after the final product has been prepared.
  • a method of preparing the thermally conductive insulating material according to the present embodiment will be described in detail below. The method comprises the following steps:
  • An uncured polymer matrix material and a low molecular viscosity-increasing additive are provided, and the uncured matrix material and the low molecular viscosity-increasing additive are uniformly mixed.
  • the polymer base material is 4 to 40 parts by weight of a vinyl silicone resin.
  • the low molecular weight increasing additive is 1 to 20 parts by weight of a vinyl MQ silicone resin.
  • 4 to 40 parts by weight and 1 to 20 parts by weight are only preferred examples, and the content can be appropriately changed according to actual needs.
  • a vinyl MQ silicone resin can be uniformly dispersed in an uncured vinyl silicone resin.
  • a mixer such as a dual planetary mixer
  • a mixer can be used to mix evenly by vacuum stirring. It is also possible to disperse the above two resins (vinyl silicone resin and vinyl MQ silicone resin) in a solvent such as naphtha (or other silicone solvent such as toluene or n-glycol), and then use a stirring device (such as a double planet). Mixer) Mix evenly.
  • thermally conductive insulating particles are uniformly mixed into the above dispersed resin mixture.
  • alumina, boron nitride, aluminum nitride, magnesium oxide, and zinc oxide satisfying a predetermined particle size requirement are uniformly mixed by a stirring device to completely disperse the particles.
  • a stirring device to completely disperse the particles.
  • the alumina particles are uniformly dispersed in the above dispersed resin mixture.
  • a mixed material of a vinyl silicone resin, a vinyl MQ silicone resin, and a thermally conductive insulating particle is cured at a temperature of 100 to 180 °C. After a few minutes (such as 1 to 10 minutes, but not limited to this), the curing is completed.
  • thermally conductive insulating material having a pressure-sensitive adhesive is formed.
  • a support carrier (or a diaphragm) may be added to the heat conductive insulating material having the above composition to form heat conduction.
  • Insulation sheet may be, for example, a glass fiber cloth or an insulating polymer film such as PEN (polyethylene naphthalate) or PI (polyimide), but is not limited thereto.
  • a method of preparing a thermally conductive insulating sheet is as follows:
  • This step can be the same as the aforementioned step (1).
  • B. The thermally conductive insulating particles are uniformly mixed into the above dispersed resin mixture. This step can be the same as the aforementioned step (2).
  • a carrier is provided, and the material mixed by the above step B is coated on both sides of the carrier.
  • the support may be selected from glass fiber cloths, or insulating polymer films such as PEN, PI, etc., but not exclusively, and may be other porous or non-porous films capable of supporting.
  • the thickness of the film can be selected according to the final requirements for heat conduction and insulation properties of the product and/or the thickness of the product. Generally, it can be selected between 12 and 100 microns, but is not limited thereto. Different thicknesses can be chosen for different carrier materials. As an example, a PEN polymer can be selected with a film thickness of 0.0254 mm.
  • the solvent may be adjusted by the solvent in the above step B to bring the viscosity of the solution to the level required by the coating process.
  • the mixed solution can then be applied to the support PEN polymer film.
  • a heat-conductive insulating sheet having a pressure-sensitive adhesive strength having a stronger tensile strength is formed.
  • the formed thermally conductive insulating sheet can be wound or sliced for ease of use.
  • the vinyl silicone resin may also be replaced by one or more of an organopolysiloxane, an acrylate, or a polyamide resin.
  • the vinyl MQ silicone resin as a tackifying additive may also be made of rosin or ethylene.
  • a phenylacetate resin or other MQ silicone resin or the like is substituted as long as at least one of the tackifying additives has a group providing a viscosity and having a curing reactive group which is the same as or similar to at least one of the matrix materials.
  • the curing reactive reactive group of the organopolysiloxane is siloxane
  • the curing reactive group of the acrylate is an unsaturated double bond
  • the curing reactive group of the polyamide resin is an amine group, rosin or
  • the viscous group of the vinyl phenylacetate resin is a hydroxyl group
  • the group which undergoes a curing crosslinking reaction with the matrix material may be a silicon hydrogen bond or a carbon-carbon double bond. Therefore, after the replacement, a thermally conductive insulating material having good thermal conductive properties and viscosity and a thermally conductive insulating sheet can be produced.
  • the thermally conductive insulating sheet having the above composition has good thermal conductive insulating properties, and both sides of the thermally conductive insulating sheet are sticky. Therefore, under the premise of ensuring insulation, the surface contact with the heat sink and the device is better realized, and a better heat conduction effect is provided.
  • the pressure sensitive adhesive of the thermally conductive insulating material produced in this embodiment can be adjusted The ratio of the addition of the vinyl MQ silicone resin is adjusted.
  • the base material of the polymer is 4 to 40 parts by weight of a polyisobutylene polymer.
  • the low molecular weight-increasing additive is 1 to 20 parts by weight of petroleum rosin.
  • 4 to 40 parts by weight and 1 to 20 parts by weight are only preferred, and a reasonable change in the content can be carried out according to actual needs.
  • the thermally conductive insulating particles may be one or more selected from the group consisting of alumina, boron nitride, aluminum nitride, magnesium oxide, and zinc oxide, and are used in an amount of, for example, 40 to 85 parts by weight.
  • 40 to 85 parts by weight are only preferred examples, and a reasonable change in the content may be carried out according to actual needs.
  • the thermally conductive insulating material comprises: 4 parts by weight of a polyisobutylene polymer, 1 part by weight of petroleum rosin, and 60 parts by weight of boron nitride and zinc oxide particles.
  • the thermally conductive insulating material comprises: 20 parts by weight of a polyisobutylene polymer, 10 parts by weight of petroleum rosin, and 70 parts by weight of boron nitride and zinc oxide particles.
  • the thermally conductive insulating material comprises: 40 parts by weight of a polyisobutylene polymer, 20 parts by weight of petroleum rosin, and 80 parts by weight of boron nitride and zinc oxide particles.
  • the uncured polyisobutylene polymer, the petroleum rosin, and the thermally conductive insulating particles are thoroughly mixed and uniformly formed, and after curing, a thermally conductive insulating material having good thermal conductive properties and viscosity is formed.
  • a support carrier may be added to the mixture of the fully mixed polyisobutylene polymer, the petroleum rosin, and the thermally conductive insulating particles, such as a glass fiber cloth or an insulating polymer film such as PEN or PI to form a heat conductive insulation. sheet.
  • thermally conductive insulating material or thermally conductive insulating sheet is as follows:
  • the amount of the polyisobutylene polymer is, for example, 4 to 40 parts by weight
  • the amount of the petroleum rosin is, for example, 1 to 20 parts by weight.
  • the polyisobutylene polymer and the petroleum rosin may be uniformly mixed by using a stirring device, or the two resins may be separately dispersed in a solvent such as naphtha, and then uniformly mixed by a stirring device.
  • thermally conductive insulating particles are uniformly mixed into a mixture of a polyisobutylene polymer and a petroleum rosin.
  • a thermally conductive insulating material having a pressure-sensitive adhesive is formed.
  • the material mixed by the step (2) is first coated on both sides of a support carrier (such as glass fiber cloth, PEN or PI), and then coated on the polymer film. The mixture is cured.
  • a support carrier such as glass fiber cloth, PEN or PI
  • the thermally conductive insulating sheet to which the support carrier is added has better tear resistance.
  • the experimental verification has been carried out on electronic components.
  • the test proves that the above thermal conductive insulating material and thermal conductive insulating sheet of the present embodiment have good thermal conductive insulating properties, and the surface of the material has viscosity (pressure sensitive adhesive, that is, viscosity is sensitive to pressure). Therefore, it is possible to adhere between the heat sink and the electronic component without using double-sided tape.
  • the strength of the pressure sensitive property of the thermally conductive insulating material prepared in this embodiment can be adjusted by controlling the ratio of the added petroleum rosin to suit the requirements of different environments.
  • the adhesiveness of the surface of the material the surface contact with the heat sink and the device is better realized, and a better heat conduction effect is provided under the premise of ensuring insulation.
  • the in situ addition of petroleum rosin used in the examples of the present invention does not have any negative impact on the insulating properties of the matrix material, and the additional bonding tape or binder does not require any additional processing.
  • the petroleum rosin has a group which provides viscosity (such as a carboxyl group and a hydroxyl group) and has the same curing reactive group (unsaturated double bond) as the polyisobutylene polymer, and thus can be completed with the polyisobutylene polymer.
  • Crosslinking cures such as a carboxyl group and a hydroxyl group
  • the base material of the polymer is 4 to 40 parts by weight of a silicone rubber.
  • the low molecular weight-increasing additive is 1 to 20 parts by weight of a silicone resin.
  • 4 to 40 parts by weight and 1 to 20 parts by weight are merely preferred examples, and a reasonable change in the content may be carried out according to actual needs.
  • the thermally conductive insulating particles may be one or more selected from the group consisting of alumina, boron nitride, aluminum nitride, magnesium oxide, and zinc oxide, and are used in an amount of, for example, 40 to 85 parts by weight.
  • 40 to 85 parts by weight are only preferred examples, and a reasonable change in the content may be carried out according to actual needs.
  • the thermally conductive insulating material comprises: 4 parts by weight of silicone rubber, 1 part by weight of silicone resin, and 40 parts by weight of boron nitride particles.
  • the thermally conductive insulating material comprises: 20 parts by weight of a silicone rubber, 10 parts by weight of a silicone resin, and 70 parts by weight of boron nitride particles. In another specific example, the thermally conductive insulating material comprises: 40 parts by weight of a silicone rubber, 20 parts by weight of a silicone resin, and 85 parts by weight of boron nitride particles.
  • thermally conductive insulating material having good thermal conductive properties and viscosity is formed.
  • a support carrier may be added to the mixture of the fully mixed silicone rubber, the silicone resin, and the thermally conductive insulating particles, such as a glass fiber cloth or an insulating polymer film such as PEN or PI to form a thermally conductive insulating sheet.
  • thermally conductive insulating material or thermally conductive insulating sheet is as follows:
  • the amount of the silicone rubber is, for example, 4 to 40 parts by weight, and the amount of the silicone resin is, for example, 1 to 20 parts by weight.
  • the silicone rubber and the silicone resin may be uniformly mixed by using a stirring device, or the two resins may be separately dispersed in a solvent such as naphtha, and then uniformly mixed by a stirring device.
  • thermally conductive insulating particles are uniformly mixed into a mixture of a silicone rubber and a silicone resin.
  • the material mixed by the step (2) is directly cured.
  • a thermally conductive insulating material having a pressure-sensitive adhesive is formed.
  • the material mixed in step (2) is first coated on both sides of a support carrier (such as glass fiber cloth, PEN or PI), and then coated on the polymer film. The mixture is cured.
  • a support carrier such as glass fiber cloth, PEN or PI
  • the thermally conductive insulating sheet to which the support carrier is added has better tear resistance.
  • the experimental verification has been carried out on electronic components.
  • the test proves that the above thermal conductive insulating material and thermal conductive insulating sheet of the present embodiment have good thermal conductive insulating properties, and the surface of the material has viscosity (pressure sensitive adhesive, that is, viscosity is sensitive to pressure). Therefore, it is possible to adhere between the heat sink and the electronic component without using double-sided tape.
  • the strength of the pressure sensitive property of the thermally conductive insulating material prepared in this embodiment can be adjusted by controlling the proportion of the added silicone resin to meet the requirements of different use environments. By the adhesiveness of the surface of the material, the surface contact with the heat sink and the device is better realized, and a better heat conduction effect is provided under the premise of ensuring insulation.
  • the method of in-situ addition of silicone resin employed in embodiments of the present invention does not have any negative impact on the insulating properties of the matrix material, and the additional bonding tape or adhesive does not require any additional processing.
  • the silicone resin has a group (hydroxyl group) which provides viscosity, and has the same curing reactive group (unsaturated double bond) as the silicone rubber, and thus can be crosslinked and cured with the polyisobutylene polymer.
  • the base material of the polymer is 4 to 40 parts by weight of polyurethane.
  • the low molecular weight thickening additive is from 1 to 20 parts by weight of the polyol.
  • 4 to 40 parts by weight and 1 to 20 parts by weight are merely preferred examples, and a reasonable change in the content may be carried out according to actual needs.
  • the thermally conductive insulating particles may be one or more selected from the group consisting of alumina, boron nitride, aluminum nitride, magnesium oxide, and zinc oxide, and are used in an amount of, for example, 40 to 85 parts by weight.
  • 40 to 85 parts by weight are only preferred examples, and a reasonable change in the content may be carried out according to actual needs.
  • the thermally conductive insulating material comprises: 4 parts by weight of polyurethane, 1 part by weight of a polyol, and 40 parts by weight of aluminum nitride particles.
  • the thermally conductive insulating material comprises: 20 parts by weight of polyurethane, 10 parts by weight of a polyol, and 60 parts by weight of aluminum nitride particles.
  • the thermally conductive insulating material comprises: 40 parts by weight of polyurethane, 20 parts by weight of a polyol, and 85 parts by weight of aluminum nitride particles.
  • a support for supporting such as a glass cloth or an insulating polymer film such as PEN or PI, may be added to the mixture of the sufficiently mixed polyurethane, polyol, and thermally conductive insulating particles to form a thermally conductive insulating sheet.
  • thermally conductive insulating material or thermally conductive insulating sheet is as follows:
  • the amount of the polyurethane is, for example, 4 to 40 parts by weight, and the amount of the polyol is, for example, 1 to 20 parts by weight.
  • the polyurethane and the polyol may be uniformly mixed by using a stirring device, or the two resins may be separately dispersed in a solvent such as naphtha, and then uniformly mixed by a stirring device.
  • thermally conductive insulating particles are uniformly mixed into a mixture of polyurethane and polyol.
  • the material mixed by the step (2) is directly solidified.
  • a thermally conductive insulating material having a pressure sensitive adhesive is formed.
  • the material mixed by the step (2) is first coated on both sides of a support carrier (such as glass fiber cloth, PEN or PI), and then coated on the polymer film. The mixture is cured.
  • a support carrier such as glass fiber cloth, PEN or PI
  • the thermally conductive insulating sheet to which the support carrier is added has better tear resistance.
  • the experimental verification has been carried out on electronic components.
  • the test proves that the above thermal conductive insulating material and thermal conductive insulating sheet of the present embodiment have good thermal conductive insulating properties, and the surface of the material has viscosity (pressure sensitive adhesive, that is, viscosity is sensitive to pressure). Therefore, it is possible to adhere between the heat sink and the electronic component without using double-sided tape.
  • the strength of the pressure sensitive property of the thermally conductive insulating material prepared in this embodiment can be adjusted by controlling the ratio of the added polyol to suit the requirements of different use environments. By making the surface of the material sticky, it is better to achieve surface contact with the heat sink and the device, and to provide better thermal conductivity while ensuring insulation.
  • the method of in situ addition of the polyol employed in the examples of the present invention does not have any negative effect on the insulating properties of the matrix material, and the additional bonding tape or binder does not require any additional process.
  • the polyol has a group (hydroxyl group) which provides viscosity, and the hydroxyl group can be crosslinked by esterification reaction with the polyurethane, so that crosslinking and curing can be completed with the polyurethane.
  • the base material of the polymer is 4 to 40 parts by weight of methyl methacrylate.
  • the low molecular weight-increasing additive is 1 to 20 parts by weight of ethyl acrylate.
  • 4 to 40 parts by weight and 1 to 20 parts by weight are merely preferred examples, and a reasonable change in the content may be carried out according to actual needs.
  • the thermally conductive insulating particles may be one or more selected from the group consisting of alumina, boron nitride, aluminum nitride, magnesium oxide, and zinc oxide, and are used in an amount of, for example, 40 to 85 parts by weight.
  • 40 to 85 parts by weight are only preferred examples, and a reasonable change in the content may be carried out according to actual needs.
  • the thermally conductive insulating material comprises: 4 parts by weight of methyl methacrylate, 1 part by weight of ethyl acrylate, and 40 parts by weight of magnesium oxide and zinc oxide particles.
  • the thermally conductive insulating material comprises: 20 parts by weight of methyl methacrylate, 10 parts by weight of ethyl acrylate, and 60 parts by weight of magnesium oxide and zinc oxide particles.
  • the thermally conductive insulating material comprises: 40 parts by weight of methyl methacrylate, 20 parts by weight of ethyl acrylate, and 85 parts by weight of magnesium oxide and zinc oxide particles. After the above-mentioned methyl methacrylate, ethyl acrylate, and thermally conductive insulating particles are sufficiently mixed and uniformly cured, a thermally conductive insulating material having both good thermal conductive properties and viscosity is formed.
  • a support carrier may be added to a mixture of sufficiently mixed methyl methacrylate, ethyl acrylate, and thermally conductive insulating particles, such as a glass fiber cloth or an insulating polymer film such as PEN or PI to form heat conduction. Insulation sheet.
  • thermally conductive insulating material or thermally conductive insulating sheet is as follows:
  • methyl methacrylate and ethyl acrylate Provide uncured methyl methacrylate and ethyl acrylate and mix them evenly.
  • the amount of methyl methacrylate is, for example, 4 to 40 parts by weight, and the amount of ethyl acrylate is, for example, 1 to 20 parts by weight.
  • Methyl methacrylate and ethyl acrylate may be uniformly mixed by using a stirring device, or the two resins may be separately dispersed in a solvent such as naphtha, and then uniformly mixed by a stirring device.
  • thermally conductive insulating particles are uniformly mixed into a mixture of methyl methacrylate and ethyl acrylate.
  • the material mixed by the step (2) is directly cured.
  • a thermally conductive insulating material having a pressure-sensitive adhesive is formed.
  • the material mixed in step (2) is first coated on both sides of a support carrier (such as glass fiber cloth, PEN or PI), and then coated on the polymer film. The mixture is cured.
  • a support carrier such as glass fiber cloth, PEN or PI
  • the thermally conductive insulating sheet to which the support carrier is added has better tear resistance.
  • the experimental verification has been carried out on electronic components.
  • the test proves that the above thermal conductive insulating material and thermal conductive insulating sheet of the present embodiment have good thermal conductive insulating properties, and the surface of the material has viscosity (pressure sensitive adhesive, that is, viscosity is sensitive to pressure). Therefore, it is possible to adhere between the heat sink and the electronic component without using double-sided tape.
  • the strength of the pressure sensitive property of the thermally conductive insulating material prepared in this embodiment can be adjusted by controlling the ratio of the added ethyl acrylate to meet the requirements of different use environments.
  • the adhesiveness of the surface of the material the surface contact with the heat sink and the device is better realized, and a better heat conduction effect is provided under the premise of ensuring insulation.
  • the method of adding ethyl acrylate in situ according to the embodiment of the present invention does not have any negative effect on the insulation properties of the base material. Oral, and additional adhesive tape or adhesive does not require any additional processing.
  • ethyl acrylate has a group which provides viscosity (such as a hydroxyl group and a carboxyl group), and has the same curing reactive group (unsaturated double bond) as methyl methacrylate, and thus can be combined with methacrylic acid
  • the ester is crosslinked and cured.
  • each contains a polymer matrix material and a low molecular viscosity-increasing additive, but in actual use, it is not limited to such a case, a thermal conductive insulating material or The thermally conductive insulating sheet may contain not only a plurality of polymer matrix materials but also various low molecular viscosity increasing additives.
  • the matrix material of the polymer is selected from the group consisting of vinyl silicone resin, polyisobutylene polymer, silicone rubber, polyurethane, methyl methacrylate, organopolysiloxane, methyl vinyl silicone resin, acrylate. And one or more of the polyamide resins.
  • the total content of the base material is 4 to 40 parts by weight.
  • 4 to 40 parts by weight is only a preferred example, and a reasonable change in the content may be carried out according to actual needs.
  • the low molecular viscosity increasing additive is selected from one or more of MQ silicone resin, petroleum rosin, silicone resin, polyol, ethyl acrylate, rosin and vinyl phenyl acetate resin, as long as the selected low molecular viscosity increasing additive At least one of them has a group providing a viscosity and has a curing reactive group which is the same as or similar to at least one of the selected matrix materials.
  • the total content of the selected low molecular weight thickening additive is from 1 to 20 parts by weight. Here, 1 to 20 parts by weight is only a preferred example, and a reasonable change in the content may be carried out according to actual needs.
  • the base material for example, 15 parts by weight of each of the vinyl silicone resin, the polyisobutylene polymer, and the silicone rubber may be selected, in total, 45 parts by weight.
  • the tackifying additive 3 parts by weight of MQ silicone resin and petroleum rosin may be selected, respectively, for a total of 9 parts by weight.
  • the thermally conductive insulating particles may be one or more metal oxides and/or metal nitride particles, such as one or more selected from the group consisting of alumina, boron nitride, aluminum nitride, magnesium oxide, and zinc oxide.
  • the amount used is, for example, 40 to 85 parts by weight.
  • 40 to 85 parts by weight are only preferred examples, and a reasonable change in the content can be carried out according to actual needs.
  • 65 parts by weight of boron nitride particles may be selected.
  • the low molecular viscosity-increasing additive and the heat-conductive insulating particles are thoroughly mixed and uniformly formed, after solidification molding, a conductive guide having good thermal conductivity and viscosity can be formed. Thermal insulation material.
  • a support carrier may be added to the mixture of the sufficiently mixed base material, the low molecular viscosity-increasing additive, and the thermally conductive insulating particles, such as a glass fiber cloth or an insulating polymer film such as PEN or PI to form a thermal conductive insulation. sheet.
  • thermally conductive insulating material or thermally conductive insulating sheet is as follows:
  • the matrix is selected from one or more of a vinyl silicone resin, a polyisobutylene polymer, a silicone rubber, a polyurethane, a methyl methacrylate, an organopolysiloxane, an acrylate, and a polyamide resin.
  • the base material has a total content of 4 to 40 parts by weight.
  • the low molecular viscosity increasing additive is selected from one or more of MQ silicone resin, petroleum rosin, silicone resin, polyol, ethyl acrylate, rosin and vinyl phenyl acetate resin, as long as the selected low molecular viscosity increasing additive At least one of them has a reactive group that provides viscosity and has a curing reactive group that is the same as or similar to at least one of the selected matrix materials.
  • the total content of the selected low molecular weight thickening additive is from 1 to 20 parts by weight.
  • the selected matrix material and the low molecular viscosity-increasing additive may be uniformly mixed by using a stirring device, or the selected matrix material and the low molecular viscosity-increasing additive may be separately dispersed in a solvent such as naphtha, and then uniformly mixed by a stirring device.
  • thermally conductive insulating particles are uniformly mixed into a mixture of the selected base material and the low molecular viscosity increasing additive.
  • the material mixed by the step (2) is directly cured.
  • a thermally conductive insulating material having a pressure-sensitive adhesive is formed.
  • the material mixed in step (2) is first coated on both sides of a support carrier (such as glass fiber cloth, PEN or PI), and then coated on the polymer film. The mixture is cured.
  • a support carrier such as glass fiber cloth, PEN or PI
  • the thermally conductive insulating sheet to which the support carrier is added has better tear resistance.
  • thermo conductive insulating material of the present embodiment has good thermal conductive insulating properties, and the surface of the material has viscosity (pressure sensitive adhesive, that is, viscosity is sensitive to pressure), so that it can be adhered. Attached between the heat sink and the electronic components without using double-sided tape.
  • the strength of the pressure sensitive property of the thermally conductive insulating material prepared in this embodiment can be adjusted by controlling the proportion of the added tackifying additive to suit the requirements of different use environments. By making the surface of the material sticky, it is better to achieve surface contact with the heat sink and the device, and to provide better thermal conductivity while ensuring insulation. Moreover, the method of in situ addition of the tackifying additive employed in embodiments of the present invention does not have any negative impact on the insulating properties of the matrix material, and the additional bonding tape or adhesive does not require any additional processing.
  • the tackifying additive has a reactive group that provides viscosity and has the same reactive curing reactive group as at least one of the matrix materials, so that crosslinking and curing can be completed with the matrix material, and the cured material is obtained. Sticky.

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Abstract

本发明提供一种导热绝缘材料、导热绝缘片以及制备该导热绝缘材料和导热绝缘片的方法。其中,所述导热绝缘材料主要由如下成分组成:4〜40重量份的高分子基体材料;1〜20重量份的增粘添加剂,该增粘添加剂中含有与所述高分子基体材料中的至少一种固化活性基团相同或相类似的反应基团;以及40〜85重量份的导热绝缘颗粒。本发明的导热绝缘材料良好的导热绝缘性能、又具有粘性,因此无需借助于双面胶或电暈处理就可以粘附在散热器和电子元器件之间。

Description

一种导热绝缘材料、 导热绝缘片及其制备方法 技术领域
本发明涉及一种导热绝缘材料、 导热绝缘片以及制备该导热绝缘材料和 导热绝缘片的方法。 背景技术
近年来, 随着半导体器件集成工艺的迅速发展, 半导体器件的集成化程 度越来越高。 设计工程师都力求在更小的面积上安装更多的半导体器件, 以 实现仪器设备的小型化。 为保证这些高度集成的半导体器件能够稳定运行, 各个电子元器件所产生的热量必须有效、 及时的传递到周围环境中去。 通常 的方法是在集成了半导体器件的电子元器件表面安装铜、 铝等高导热率的金 属散热器, 增大散热面积。 然而, 电子元器件和散热器的表面不能是绝对平 整, 两者接触时不可避免的产生空气隙, 空气隙的存在使得散热效率大大降 低。 因此, 为了让散热片与发热的器件表面更好的结合, 使散热效果更好, 需要在散热器和电子元器件之间填充能够导热的材料。 普通的导热硅脂和相 变材料具有很好的导热效果, 但是电绝缘性比较差, 不能适用于那些需要很 高绝缘的场合。 柔软的导热填隙材料虽然具有一定的电绝缘性, 但是不能用 于那些需要很高绝缘的场合, 并且这类材料只适合于压力较低的应用, 不能 胜任像大功率电源, 汽车等领域。
既导热又绝缘的导热绝缘材料可以很好的解决在要求高绝缘条件下的导 热问题, 导热绝缘材料可以有效地连接器件和散热器, 提供导热通道以降低 热阻, 并且良好的电气绝缘性能可以保证器件的正常运转。 常规的导热绝缘 材料是完全固化的硅树脂复合材料, 其一般是采用硅树脂为基材, 以氧化铝、 氮化铝、 氧化锌等导热绝缘的陶瓷颗粒作为填充剂。 但是, 由于固化完全的 硅树脂表面不具有粘性, 在使用过程中, 在将绝缘材料安装到散热器或器件 的过程中容易滑落移位, 尤其是在垂直的平面上进行操作时。 为了使得材料 表面具有粘性, 目前常用的方法是将双面胶带附在导热绝缘片的表面, 使得 导热绝缘材料表面具有一定的粘性。 但是该方法带来很多弊端, 一方面, 导 热绝缘材料表面能很低, 胶带不能直接粘贴在表面, 需要昂贵的硅胶带或者 经过额外的电暈等对导热绝缘材料进行处理来提高材料表面能, 然后再用胶 带粘贴在表面。 采用硅胶带无疑增加了成本, 而电暈过程又很容易对材料性 能尤其是绝缘性能产生破坏。 另一方面, 双面胶带的导热性很低, 因此使得 导热绝缘材料整体的导热效果下降。 同时, 目前的工艺很难在导热绝缘材料 两面同时使用粘性胶带来使材料双面都具有粘性, 从而限制了导热绝缘材料 的使用范围。 发明内容
本发明是鉴于上述现有技术的问题而提出的。 本发明的一个发明在于提 供一种导热绝缘材料、 导热绝缘片以及制备该导热绝缘材料和导热绝缘片的 方法, 以解决现有技术中存在的一个或更多个问题。
根据本发明的一个方面, 提供一种导热绝缘材料, 该导热绝缘材料主要 由如下成分组成: 4〜40重量份的高分子基体材料; 1〜20重量份的增粘添加 剂, 该增粘添加剂中含有与所述高分子基体材料中的至少一种固化活性基团 相同或相类似的反应基团; 以及 40〜85重量份的导热绝缘颗粒。
根据本发明的一个方面, 提供一种导热绝缘片, 该导热绝缘片包括: 支 撑膜片; 以及涂覆在所述支撑膜片上的导热绝缘材料, 该导热绝缘材料主要 由如下成分组成: 4〜40重量份的高分子基体材料; 1〜20重量份的增粘添加 剂, 该增粘添加剂中含有与所述高分子基体材料中的至少一种固化活性基团 相同或相类似的反应基团; 以及 40〜85重量份的导热绝缘颗粒。
根据本发明的一个方面, 提供一种制备导热绝缘材料的方法, 该方法包 括如下步骤: 提供 4〜40重量份的未固化的高分子基体材料和 1〜20重量份 的增粘添加剂, 并将该高分子基体材料和增粘添加剂混合均匀, 其中该增粘 添加剂中含有与所述高分子基体材料中的至少一种固化活性基团相同或相类 似的反应基团; 提供 40〜85重量份的导热绝缘颗粒, 并将该导热绝缘颗粒均 匀地添加到混合后的所述高分子基体材料和增粘添加剂中; 以及对添加了所 述导热绝缘颗粒的高分子基体材料和增粘添加剂的混合物进行固化成型。
根据本发明的一个方面, 提供一种制备导热绝缘片的方法, 该方法包 括如下步骤:提供 4〜40重量份的未固化的高分子基体材料和 1〜20重量份 的增粘添加剂, 并将该高分子基体材料和增粘添加剂混合均匀, 其中该增粘 添加剂中含有与所述高分子基体材料中的至少一种固化活性基团相同或相类 似的反应基团; 提供 40〜85重量份的导热绝缘颗粒, 并将该导热绝缘颗粒均 匀地添加到混合后的所述高分子基体材料和增粘添加剂中; 提供支撑膜片, 将添加了所述导热绝缘颗粒的高分子基体材料和增粘添加剂的混合物涂覆在 所述支撑膜片上; 以及将涂覆在所述支撑膜片上的混合物进行固化成型。
上述高分子基体材料为适于用在电子元器件和散热器之间的材料。 优选 地, 所述高分子基体材料可选自乙烯基硅树脂、 聚异丁烯聚合物、 有机硅橡 胶、 聚氨酯、 甲基丙烯酸甲酯、 有机聚硅氧垸、 丙烯酸酯和聚酰胺树脂中的 一种或几种; 所述增粘添加可剂选自 MQ硅树脂、 石油松香脂、 硅酮树脂、 多元醇、 丙烯酸乙酯、 松香和乙烯苯基醋酸树脂中的一种或几种。
优选地, 所述导热绝缘颗粒可选自氧化铝、 氮化硼、 氮化铝、 氧化镁和 氧化锌中的一种或更多种。
优选地, 所述支撑膜片选自玻璃纤维布、 PEN或 PI。
本发明实施例的导热绝缘材料既具有良好的导热绝缘性能,又具有粘性, 无需使用双面胶带就能够粘附在散热器和电子元器件之间。
此外, 本发明实施例中的导热绝缘材料没有为了使用胶带而引入的电暈 等额外工艺, 避免了对材料绝缘性能的损坏, 同时也克服了胶带导热系数低, 影响产品整体导热能力的问题。 整个制程没有额外的工艺, 相比于之前的设 计极大的简化了制备工艺和成本。 因此, 本发明的导热绝缘材料在保证绝缘 性的前提下, 更好的实现了与散热器和器件的表面接触, 提供了更好的导热 效果。 具体实施方式
下面将对本发明的具体实施方式进行详细说明。 在下面的描述中, 出于 解释而非限制的目的, 阐述了具体细节, 以帮助全面地理解本发明。 然而, 对本领域技术人员来说显而易见的是, 也可以在脱离了这些具体细节的其它 实施方式中实践本发明。
应该强调的是, 在以下的说明中使用的用语 "包括 /包含 /具有"用于指明 所描述的特征、 步骤等的存在, 而并不排除其它特征、 步骤或它们的组合的 存在。 本发明实施例提供的导热绝缘材料主要由如下材料组成: 高分子基体材 料、 用于提供粘性的添加剂 (可称为增粘添加剂) 和导热绝缘颗粒。 具体地, 本发明主要通过将弹性的高分子基体材料和刚性的增粘添加剂相混合, 并填 充导热绝缘颗粒来形成导热绝缘材料。 其中增粘添加剂可具有提供粘性的活 性基团 (如羟基官能团或其它能够提供粘性的官能团), 并还具有与高分子基 体材料中的至少一种固化活性基团相同或相类似的反应基团 (如乙烯基等), 以便可以与基体材料发生固化交联反应。
本发明实施例中, 弹性的高分子基体材料可以是高分子树脂或其它高分 子聚合物等材料。 增粘添加剂例如可以是低分子树脂等低分子聚合物也可以 是其它低分子材料, 但并不限于此。
下面进行详细举例说明。
实施例 1
本实施例中提供的导热绝缘材料中, 高分子基体材料为乙烯基硅树脂、 增粘添加剂为乙烯基 MQ硅树脂。
在一个具体示例中, 导热绝缘材料包括: 4重量份的乙烯基硅树脂, 1重 量份的乙烯基 MQ硅树脂和 40重量份的具有不同粒度的氧化铝颗粒。
在另一具体示例中, 导热绝缘材料包括: 20 重量份的乙烯基硅树脂, 10 重量份的乙烯基 MQ硅树脂和 70重量份的具有不同粒度的氧化铝颗粒。
在另一具体示例中, 导热绝缘材料包括: 40 重量份的乙烯基硅树脂, 20 重量份的乙烯基 MQ硅树脂和 85重量份的具有不同粒度的氧化铝颗粒。
但如上各成分的重量份仅为示例, 本发明并不限于上述个成分的重量份 取值。 优选地, 本实施例的导热绝缘材料中, 可以包含 4〜40重量份的乙烯 基硅树脂、 1〜20重量份的乙烯基 MQ硅树脂和 40〜85重量份的导热绝缘颗 粒。 但本发明也不限于该优选的情况, 而是还可以根据实际需要和有限的实 验进行各成分的含量的合理的变更。
上述成分中, 乙烯基 MQ硅树脂具有羟基官能团, 同时, 该乙烯基 MQ 硅树脂还具有与乙烯基硅树脂的固化活性基团相同的反应基团, 即不饱和双 键。
导热绝缘颗粒可以为一种或更多种金属氧化物和 /或金属氮化物颗粒, 例 如选自氧化铝、 氮化硼、 氮化铝、 氧化镁和氧化锌中的一种或更多种。 导热 绝缘颗粒的粒径例如可以选择 1〜30微米, 但并不限于此。 在选择导热绝缘 颗粒时, 可以选择均匀粒径的一种或更多种导热绝缘颗粒, 也可以选择一种 或更多种金属氧化物和 /或金属氮化物颗粒的不同粒径的组合, 例如, 可以选 择 10〜30微米的氧化铝颗粒和 1〜10微米的氮化硼颗粒的组合。在此所列举 的数字仅为优选示例, 完全可以根据实际需要选择具有更宽或更窄粒径范围 的导热绝缘颗粒。
将未固化的高分子的乙烯基硅树脂和乙烯基 MQ硅树脂混合均匀后, 将 导热绝缘颗粒均匀分散在其中, 然后对混合后的材料进行固化, 就可以形成 既具有良好的导热绝缘性能、 又具有粘性的导热绝缘材料, 无需借助于双面 胶或电暈处理就可以很好的粘附在电子元器件和散热器之间。
通过在电子元器件中的多次实验测试中已经证明,本实施例的如上的导热 绝缘材料具有良好的导热绝缘性能, 并且具有粘性 (也称压敏粘性, 即粘性对 压力敏感), 能够粘附在散热器和电子元器件之间, 而无需使用双面胶带, 从 而克服了胶带导热系数低, 影响产品整体导热能力的问题。
如下表 1中列举了本发明实施例中 3种导热绝缘材料与现有技术中的三 种导热绝缘产品的导热绝缘性能及粘性的比较。 表 1中, "普通样品"为购买 的一种现有的普通的没有粘性的导热绝缘材料产品。 "提供了单面粘性的普通 样品"为对与普通样品相同的样品的单面贴上了双面胶带之后形成的、 提供 了单面粘性的导热绝缘材料产品 (对于双面都贴上了双面胶带之后的样品, 热阻将比提供了单面粘性的普通样品的热阻大的多)。 本发明样品 1〜本发明 样品 3分别为本发明的添加了不同重量份的乙烯基 MQ硅树脂的导热绝缘材 料产品。本发明样品 1〜本发明样品 3中, 作为基体材料的乙烯基硅树脂的含 量都为 20重量份, 乙烯基 MQ硅树脂的含量分别为 2、 4和 6重量份, 导热 绝缘颗粒 (氧化铝) 的含量为 80份。 也就是说, 本发明样品 1〜本发明样品 3中 MQ硅树脂占乙烯基硅树脂的比例分别为 5wt%、 lOwt ^P 15wt%。此外, 表 1中, "自己制备的普通样品"为采用了与本发明样品 1〜本发明样品 3相同 的重量份的乙烯基硅树脂和相同的重量份的导热绝缘颗粒 (氧化铝) 而制成 的样品。 也就是说, "自己制备的普通样品"中处理不具有乙烯基 MQ硅树脂 夕卜, 其它成分与本发明样品 1〜本发明样品 3相同。 此外, 本发明样品 1〜本 发明样品 3的介质击穿电压(Dielectric breakdown voltage)分别为对各自样品 表 1.
Figure imgf000007_0001
从表 1 可见, 与"提供了单面粘性的普通样品"相比, 本实施例的添加了
MQ硅树脂的本发明样品 1〜3中, 只有样品 1的热阻略有升高, 样品 2和 3 的热阻都降低, 甚至低于"普通样品"的热阻。 而与未添加 MQ硅树脂的"自己 制备的普通样品"相比, 本实施例的添加了 MQ硅树脂的本发明样品 1〜3的 热阻都有降低, 并且介质击穿电压升高, 并且还具有了粘性, 也就是说, 在 添加了 MQ硅树脂后, 导热绝缘性能提高并具有了粘性。 因此本发明实施例 的添加了 MQ硅树脂的导电绝缘材料可以作为电子元器件的导热绝缘材料布 置在散热器和电子元器件之间, 并且由于材料本身具有了粘性, 从而无需双 面胶带就可以安装在散热器和电子元器件之间。 并且, 通过调节作为增粘剂 的聚合物(MQ硅树脂)的重量比例, 可以获得非常好的导热绝缘效果(甚至 优于现有的未贴双面胶带的导热绝缘材料产品) 和非常好的粘性效果 (甚至 优于双面胶带)。
本发明实施例中, 通过在未固化的弹性高分子的基体树脂 (乙烯基硅树 脂) 中加入具有提供粘性的活性基团 (如羟基) 并具有能够与乙烯基硅树脂 反应的基团 (不饱和双键) 的聚合物 (MQ硅树脂), 在对基体树脂进行固化 成型时, 低分子聚合物就能够与基体树脂共同发生交联反应, 共同完成交联 网络。 固化后的材料由于该低分子聚合物的加入可以具有一定的粘性, 并且 粘性的大小可以根据该低分子聚合物的加入比例进行调节。 本实施例中, 由 于在原位添加具有粘性的低分子聚合物, 因此整个材料的制程没有收到任何 影响和额外步骤, 同时不会对最终产品的导热绝缘性能产生负面影响。 在此 所述的原位是指添加在制备过程中完成, 而不需要在最终产品制备出来后再 引入额外的材料或者工艺。 下面详细地说明对根据本实施例的导热绝缘材料的制备方法。 该方法包 括如下步骤:
( 1 )提供未固化的高分子基体材料和低分子增粘添加剂, 并将该未固化 的基体材料和低分子增粘添加剂混合均匀。
本实施例中, 该高分子基体材料为 4〜40重量份的乙烯基硅树脂。低分子 增粘添加剂为 1〜20重量份的乙烯基 MQ硅树脂。 在此, 4〜40重量份和 1〜 20重量份仅为优选示例, 完全可以根据实际需要来合理的变更含量。
例如可将乙烯基 MQ硅树脂均匀分散在未固化的乙烯基硅树脂中。 具体 地可选用搅拌机 (如双行星搅拌机) 采用真空搅拌的方式混合均匀。 也可以 将上述两种树脂 (乙烯基硅树脂和乙烯基 MQ硅树脂) 分别分散到石脑油等 溶剂 (或甲苯、 正庚垸等其它硅树脂溶剂) 中, 然后采用搅拌设备 (如双行 星搅拌机) 混合均匀。
(2) 将导热绝缘颗粒均匀混合到上述分散好的树脂混合物中。
例如, 将 40〜85重量份的符合预定的粒径要求的氧化铝、 氮化硼、 氮化 铝、 氧化镁和氧化锌中的一种或更多种采用搅拌设备混合均匀, 使颗粒完全 分散在上述分散好的树脂混合物中。 作为一个示例, 将氧化铝粒均匀地分散 在上述分散好的树脂混合物中。
(3 ) 对混合后的材料进行固化成型。
例如,在 100〜180°C温度下对乙烯基硅树脂、 乙烯基 MQ硅树脂和导热 绝缘颗粒的混合材料进行固化成型。 经过若干分钟 (如 1〜10分钟, 但并不 限于此) 后, 固化完成。
经过如上工艺, 就形成了具有压敏粘性的导热绝缘材料。
此外, 为了更方便使用, 并增加产品的抗撕裂性, 在本发明优选实施例 中,还可以在具有如上组成的导热绝缘材料中添加支撑用的载体(或称膜片), 来形成导热绝缘片。 该支撑用的载体, 例如可为玻璃纤维布或 PEN (聚萘二 甲酸乙二醇酯)、 PI (聚酰亚胺) 等绝缘聚合物膜, 但并不限于此。
制备导热绝缘片的方法例如如下:
A、提供未固化的基体材料和低分子增粘添加剂,并将该未固化的基体材 料和低分子增粘添加剂混合均匀。
该步骤可与前述的步骤 (1 ) 相同。 B、 将导热绝缘颗粒均匀混合到上述分散好的树脂混合物中。 该步骤可与前述步骤 (2) 相同。
C、 提供一种载体, 将经如上步骤 B混合后的材料涂覆在载体的两面。 载体可以选自玻璃纤维布, 或 PEN、 PI等绝缘聚合物膜, 但并不先于此, 完全还可以是其它的能够起支撑作用的有孔或无孔的薄膜。
薄膜的厚度可根据最终对产品导热、 绝缘性能的要求和 /或对产品厚度的 要求进行选择, 一般可以选择在 12〜100微米之间, 但并不限于此。 针对不 同的载体材料可以选择不同的厚度。 作为示例, 可选择采用 PEN聚合物, 薄 膜厚度为 0.0254mm。
可以用溶剂来调节经如上步骤 B混合后的材料, 使溶液粘度达到涂覆工 艺要求的水平。 然后, 可将混合好的溶液涂覆在载体 PEN聚合物薄膜上。
D、 对涂覆在聚合物膜上的混合材料进行固化。
例如在 100〜180°C温度下经过一定时间(如 1〜10分钟,但并不限于此) 的固化之后, 就形成了具有更强的抗拉伸强度的、 具有压敏粘性的导热绝缘 片。 可对形成的导热绝缘片进行打卷或切片, 以便于使用。
在本实施例中, 乙烯基硅树脂还可由有机聚硅氧垸、 丙烯酸酯、 聚酰胺 树脂中的一种或几种来代替, 作为增粘添加剂的乙烯基 MQ硅树脂也可以由 松香、 乙烯苯基醋酸树脂或其它 MQ硅树脂等代替, 只要增粘添加剂中的至 少一种具有提供粘性的基团并具有与基体材料中至少一种相同或相类似的固 化反应基团。 例如, 在此, 有机聚硅氧垸的固化活性反应基团为硅氧垸, 丙 烯酸酯的固化活性反应基团为不饱和双键, 聚酰胺树脂的固化活性反应基团 为胺基, 松香或乙烯苯基醋酸树脂的提供粘性的基团为羟基, 与基体材料进 行固化交联反应的基团可为硅氢键或者碳碳双键。 因此, 代替后, 同样可以 生成具有良好的导热绝缘性能和粘性的导热绝缘材料以及导热绝缘片。
已经经过在电子元器件中的实验测试, 测试证明, 具有如上组成的导热 绝缘片具有良好的导热绝缘性能, 并且导热绝缘片的两面都具有粘性。 因此 在保证绝缘性的前提下, 更好的实现了与散热器和器件的表面接触, 提供了 更好的导热效果。
此外, 整个制程没有额外的工艺, 相比于之前的设计极大的简化了制备 工艺和成本。 此外, 本实施例制成的导热绝缘材料的压敏粘性可以通过调节 乙烯基 MQ硅树脂的添加比例来进行调节。
实施例 2
在本实施例中, 高分子的基体材料为 4〜40重量份的聚异丁烯聚合物。 低分子的增粘添加剂为 1〜20重量份的石油松香脂。 在此, 举出的 4〜40重 量份、 1〜20重量份仅为优选情况, 还可以根据实际需要进行含量的合理的变 更。
导热绝缘颗粒可以为选自氧化铝、 氮化硼、 氮化铝、 氧化镁和氧化锌中 的一种或更多种, 所采用的量例如为 40〜85重量份。 在此, 40〜85重量份 仅为优选示例, 还可以根据实际需要进行含量的合理的变更。
例如, 在一个具体示例中, 导热绝缘材料包括: 4重量份的聚异丁烯聚合 物, 1重量份的石油松香脂和 60重量份的氮化硼和氧化锌颗粒。
在另一具体示例中, 导热绝缘材料包括: 20重量份的聚异丁烯聚合物, 10重量份的石油松香脂和 70重量份的氮化硼和氧化锌颗粒。
在另一具体示例中, 导热绝缘材料包括: 40重量份的聚异丁烯聚合物, 20重量份的石油松香脂和 80重量份的氮化硼和氧化锌颗粒。
将未固化的聚异丁烯聚合物、 石油松香脂以及导热绝缘颗粒充分混合均 匀后, 经固化成型, 就形成了既具有良好的导热绝缘性能、 有具有粘性的导 热绝缘材料。
同样, 还可以在充分混合后的聚异丁烯聚合物、 石油松香脂以及导热绝 缘颗粒的混合物中添加支撑用的载体, 如可为玻璃纤维布或 PEN、 PI等绝缘 聚合物膜, 来形成导热绝缘片。
具体地, 制备如上导热绝缘材料或导热绝缘片的工艺如下:
( 1 ) 提供未固化的聚异丁烯聚合物和石油松香脂, 并将它们混合均匀。 其中, 聚异丁烯聚合物的量例如为 4〜40重量份, 石油松香脂的量例如 为 1〜20重量份。
可采用搅拌设备将聚异丁烯聚合物和石油松香脂混合均匀, 也可以先将 该两种树脂分别分散到石脑油等溶剂中, 再用搅拌设备混合均匀。
(2 )将导热绝缘颗粒均匀混合到聚异丁烯聚合物和石油松香脂的混合物 中。
( 3 ) 如果不需要添加支撑载体, 则直接对经步骤 (2 ) 混合后的材料进 行固化成型。
例如在一定的温度(100〜180°C, 并不限于此)下经过一定时间(如 1〜 10分钟, 或更长时间) 进行固化成型。 固化后即形成了具有压敏粘性的导热 绝缘材料。
如果要添加支撑载体, 则本步骤中首先将经步骤(2 )混合后的材料涂覆 在支撑载体 (如玻璃纤维布、 PEN或 PI ) 的两面, 然后再对涂覆在聚合物膜 上的混合物进行固化。 添加了支撑载体的导热绝缘片具有更好的抗撕裂性。
已经在电子元器件上进行的实验验证, 测试证明, 本实施例的如上的导 热绝缘材料及导热绝缘片具有良好的导热绝缘性能, 并且材料表面具有粘性 (压敏粘性,即粘性对压力敏感),因此能够粘附在散热器和电子元器件之间, 而无需使用双面胶带。 此外, 本实施例制备的导热绝缘材料的压敏性能的强 弱可以通过控制添加的石油松香脂的比例来进行调节, 以适应不同使用环境 的要求。 通过材料表面具有粘性, 更好的实现了与散热器和器件的表面接触, 在保证绝缘性的前提下, 提供了更好的导热效果。 此外, 本发明实施例采用 的原位添加石油松香脂的方法没有对基体材料的绝缘性能产生任何负面影 口向, 并且额外的粘结胶带或粘结剂也不需要任何额外工艺。
本实施例中, 石油松香脂具有提供粘性的基团 (如羧基和羟基), 并具有 与聚异丁烯聚合物相同的固化活性反应基团 (不饱和双键), 因此可以与聚异 丁烯聚合物完成交联固化。
实施例 3
在本实施例中, 高分子的基体材料为 4〜40重量份的有机硅橡胶。低分子 的增粘添加剂为 1〜20重量份的硅酮树脂。 在此, 举出的 4〜40重量份、 1〜 20重量份仅为优选示例, 还可以根据实际需要进行含量的合理的变更。
导热绝缘颗粒可以为选自氧化铝、 氮化硼、 氮化铝、 氧化镁和氧化锌中的 一种或更多种, 所采用的量例如为 40〜85重量份。 在此, 40〜85重量份仅为 优选示例, 还可以根据实际需要进行含量的合理的变更。
例如, 在一个具体示例中, 导热绝缘材料包括: 4重量份的有机硅橡胶, 1重量份的硅酮树脂和 40重量份的氮化硼颗粒。
在另一具体示例中, 导热绝缘材料包括: 20重量份的有机硅橡胶, 10重 量份的硅酮树脂和 70重量份的氮化硼颗粒。 在另一具体示例中, 导热绝缘材料包括: 40重量份的有机硅橡胶, 20重 量份的硅酮树脂和 85重量份的氮化硼颗粒。
将如上有机硅橡胶、 硅酮树脂以及导热绝缘颗粒充分混合均匀后, 经固 化成型, 就形成了既具有良好的导热绝缘性能、 又具有粘性的导热绝缘材料。
同样, 还可以在充分混合后的有机硅橡胶、 硅酮树脂以及导热绝缘颗粒 的混合物中添加支撑用的载体, 如可为玻璃纤维布或 PEN、 PI等绝缘聚合物 膜, 来形成导热绝缘片。
具体地, 制备如上导热绝缘材料或导热绝缘片的工艺如下:
( 1 ) 提供未固化的有机硅橡胶和硅酮树脂, 并将它们混合均匀。
有机硅橡胶的量例如为 4〜40重量份,硅酮树脂的量例如为 1〜20重量份。 可采用搅拌设备将有机硅橡胶和硅酮树脂混合均匀, 也可以下将该两种 树脂分别分散到石脑油等溶剂中, 再用搅拌设备混合均匀。
(2) 将导热绝缘颗粒均匀混合到有机硅橡胶和硅酮树脂的混合物中。
(3 ) 如果不需要添加支撑载体, 则直接对经步骤 (2) 混合后的材料进 行固化成型。
例如在一定的温度(100〜180°C, 并不限于此)下经过一定时间(如 1〜 10分钟, 或更长时间) 进行固化成型。 固化后即形成了具有压敏粘性的导热 绝缘材料。
如果要添加支撑载体, 则本步骤中首先将经步骤(2)混合后的材料涂覆 在支撑载体 (如玻璃纤维布、 PEN或 PI) 的两面, 然后再对涂覆在聚合物膜 上的混合物进行固化。 添加了支撑载体的导热绝缘片具有更好的抗撕裂性。
已经在电子元器件上进行的实验验证, 测试证明, 本实施例的如上的导 热绝缘材料及导热绝缘片具有良好的导热绝缘性能, 并且材料表面具有粘性 (压敏粘性,即粘性对压力敏感),因此能够粘附在散热器和电子元器件之间, 而无需使用双面胶带。 此外, 本实施例制备的导热绝缘材料的压敏性能的强 弱可以通过控制添加的硅酮树脂的比例来进行调节, 以适应不同使用环境的 要求。 通过材料表面具有粘性, 更好的实现了与散热器和器件的表面接触, 在保证绝缘性的前提下, 提供了更好的导热效果。 此外, 本发明实施例采用 的原位添加硅酮树脂的方法没有对基体材料的绝缘性能产生任何负面影响, 并且额外的粘结胶带或粘结剂也不需要任何额外工艺。 本实施例中, 硅酮树脂具有提供粘性的基团 (羟基), 并具有与有机硅橡 胶相同的固化活性反应基团 (不饱和双键), 因此可以与聚异丁烯聚合物完成 交联固化。
实施例 4
在本实施例中, 高分子的基体材料为 4〜40重量份的聚氨酯。 低分子的 增粘添加剂为 1〜20重量份的多元醇。在此, 举出的 4〜40重量份、 1〜20重 量份仅为优选示例, 还可以根据实际需要进行含量的合理的变更。
导热绝缘颗粒可以为选自氧化铝、 氮化硼、 氮化铝、 氧化镁和氧化锌中的 一种或更多种, 所采用的量例如为 40〜85重量份。 在此, 40〜85重量份仅为 优选示例, 还可以根据实际需要进行含量的合理的变更。
例如, 在一个具体示例中, 导热绝缘材料包括: 4重量份的聚氨酯, 1重 量份的多元醇和 40重量份的氮化铝颗粒。
在另一具体示例中, 导热绝缘材料包括: 20重量份的聚氨酯, 10重量份 的多元醇和 60重量份的氮化铝颗粒。
在另一具体示例中, 导热绝缘材料包括: 40重量份的聚氨酯, 20重量份 的多元醇和 85重量份的氮化铝颗粒。
将如上聚氨酯、 多元醇以及导热绝缘颗粒充分混合均匀后, 经固化成型, 就形成了既具有良好的导热绝缘性能、 又具有粘性的导热绝缘材料。
同样, 还可以在充分混合后的聚氨酯、 多元醇以及导热绝缘颗粒的混合 物中添加支撑用的载体, 如可为玻璃纤维布或 PEN、 PI等绝缘聚合物膜, 来 形成导热绝缘片。
具体地, 制备如上导热绝缘材料或导热绝缘片的工艺如下:
( 1 ) 提供未固化的聚氨酯和多元醇, 并将它们混合均匀。
聚氨酯的量例如为 4〜40重量份, 多元醇的量例如为 1〜20重量份。 可采用搅拌设备将聚氨酯和多元醇混合均匀, 也可以下将该两种树脂分 别分散到石脑油等溶剂中, 再用搅拌设备混合均匀。
(2 ) 将导热绝缘颗粒均匀混合到聚氨酯和多元醇的混合物中。
( 3 ) 如果不需要添加支撑载体, 则直接对经步骤 (2 ) 混合后的材料进 行固化成型。
例如在一定的温度(100〜180°C, 并不限于此)下经过一定时间(如 1〜 10分钟, 或更长时间) 进行固化成型。 固化后即形成了具有压敏粘性的导热 绝缘材料。
如果要添加支撑载体, 则本步骤中首先将经步骤(2 )混合后的材料涂覆 在支撑载体 (如玻璃纤维布、 PEN或 PI ) 的两面, 然后再对涂覆在聚合物膜 上的混合物进行固化。 添加了支撑载体的导热绝缘片具有更好的抗撕裂性。
已经在电子元器件上进行的实验验证, 测试证明, 本实施例的如上的导 热绝缘材料及导热绝缘片具有良好的导热绝缘性能, 并且材料表面具有粘性 (压敏粘性,即粘性对压力敏感),因此能够粘附在散热器和电子元器件之间, 而无需使用双面胶带。 此外, 本实施例制备的导热绝缘材料的压敏性能的强 弱可以通过控制添加的多元醇的比例来进行调节, 以适应不同使用环境的要 求。 通过材料表面具有粘性, 更好的实现了与散热器和器件的表面接触, 在 保证绝缘性的前提下, 提供了更好的导热效果。 此外, 本发明实施例采用的 原位添加多元醇的方法没有对基体材料的绝缘性能产生任何负面影响, 并且 额外的粘结胶带或粘结剂也不需要任何额外工艺。
本实施例中, 多元醇具有提供粘性的基团 (羟基), 羟基可以用与聚氨酯 发生酯化反应形成交联, 因此可以与聚氨酯完成交联固化。
实施例 5
在本实施例中, 高分子的基体材料为 4〜40重量份的甲基丙烯酸甲酯。 低分子的增粘添加剂为 1〜20重量份的丙烯酸乙酯。 在此, 举出的 4〜40重 量份、 1〜20重量份仅为优选示例, 还可以根据实际需要进行含量的合理的变 更。
导热绝缘颗粒可以为选自氧化铝、 氮化硼、 氮化铝、 氧化镁和氧化锌中的 一种或更多种, 所采用的量例如为 40〜85重量份。 在此, 40〜85重量份仅为 优选示例, 还可以根据实际需要进行含量的合理的变更。
例如, 在一个具体示例中, 导热绝缘材料包括: 4重量份的甲基丙烯酸甲 酯, 1重量份的丙烯酸乙酯和 40重量份的氧化镁和氧化锌颗粒。
在另一具体示例中, 导热绝缘材料包括: 20重量份的甲基丙烯酸甲酯, 10重量份的丙烯酸乙酯和 60重量份的氧化镁和氧化锌颗粒。
在另一具体示例中, 导热绝缘材料包括: 40重量份的甲基丙烯酸甲酯, 20重量份的丙烯酸乙酯和 85重量份的氧化镁和氧化锌颗粒。 将如上甲基丙烯酸甲酯、丙烯酸乙酯以及导热绝缘颗粒充分混合均匀后, 经固化成型, 就形成了既具有良好的导热绝缘性能、 又具有粘性的导热绝缘 材料。
同样, 还可以在充分混合后的甲基丙烯酸甲酯、 丙烯酸乙酯以及导热绝 缘颗粒的混合物中添加支撑用的载体, 如可为玻璃纤维布或 PEN、 PI等绝缘 聚合物膜, 来形成导热绝缘片。
具体地, 制备如上导热绝缘材料或导热绝缘片的工艺如下:
( 1 ) 提供未固化的甲基丙烯酸甲酯和丙烯酸乙酯, 并将它们混合均匀。 甲基丙烯酸甲酯的量例如为 4〜40重量份,丙烯酸乙酯的量例如为 1〜20 重量份。
可采用搅拌设备将甲基丙烯酸甲酯和丙烯酸乙酯混合均匀, 也可以下将 该两种树脂分别分散到石脑油等溶剂中, 再用搅拌设备混合均匀。
(2)将导热绝缘颗粒均匀混合到甲基丙烯酸甲酯和丙烯酸乙酯的混合物 中。
(3 ) 如果不需要添加支撑载体, 则直接对经步骤 (2) 混合后的材料进 行固化成型。
例如在一定的温度(100〜180°C, 并不限于此)下经过一定时间(如 1〜 10分钟, 或更长时间) 进行固化成型。 固化后即形成了具有压敏粘性的导热 绝缘材料。
如果要添加支撑载体, 则本步骤中首先将经步骤(2)混合后的材料涂覆 在支撑载体 (如玻璃纤维布、 PEN或 PI) 的两面, 然后再对涂覆在聚合物膜 上的混合物进行固化。 添加了支撑载体的导热绝缘片具有更好的抗撕裂性。
已经在电子元器件上进行的实验验证, 测试证明, 本实施例的如上的导 热绝缘材料及导热绝缘片具有良好的导热绝缘性能, 并且材料表面具有粘性 (压敏粘性,即粘性对压力敏感),因此能够粘附在散热器和电子元器件之间, 而无需使用双面胶带。 此外, 本实施例制备的导热绝缘材料的压敏性能的强 弱可以通过控制添加的丙烯酸乙酯的比例来进行调节, 以适应不同使用环境 的要求。 通过材料表面具有粘性, 更好的实现了与散热器和器件的表面接触, 在保证绝缘性的前提下, 提供了更好的导热效果。 此外, 本发明实施例采用 的原位添加丙烯酸乙酯的方法没有对基体材料的绝缘性能产生任何负面影 口向, 并且额外的粘结胶带或粘结剂也不需要任何额外工艺。
本实施例中, 丙烯酸乙酯具有提供粘性的基团 (如羟基和羧基), 并具有 与甲基丙烯酸甲酯相同的固化活性反应基团 (不饱和双键), 因此可以与甲基 丙烯酸甲酯完成交联固化。
实施例 6
在如上实施例的导热绝缘材料或导热绝缘片中, 各含有一种高分子基体 材料和一种低分子增粘添加剂, 但在实际使用中, 并不限于这样的情况, 一 种导热绝缘材料或导热绝缘片中不仅可以含有多种高分子基体材料, 还可以 含有多种低分子增粘添加剂。
在本实施例中, 高分子的基体材料选自乙烯基硅树脂、 聚异丁烯聚合物、 有机硅橡胶、 聚氨酯、 甲基丙烯酸甲酯、 有机聚硅氧垸、 甲基乙烯基硅树脂、 丙烯酸酯和聚酰胺树脂中的一种或几种。 该基体材料的总的含量为 4〜40重 量份。在此, 4〜40重量份仅为优选示例, 还可以根据实际需要进行含量的合 理的变更。
低分子增粘添加剂选自 MQ硅树脂、 石油松香脂、 硅酮树脂、 多元醇、 丙烯酸乙酯、 松香和乙烯苯基醋酸树脂等中的一种或几种, 只要选择的低分 子增粘添加剂中的至少一种具有提供粘性的基团并具有与选择的基体材料中 至少一种相同或相类似的固化反应基团。 选择的低分子增粘添加剂的总含量 为 1〜20重量份。在此, 1〜20重量份仅为优选示例, 还可以根据实际需要进 行含量的合理的变更。
作为示例,对于基体材料,例如可以选择各占 15重量份的乙烯基硅树脂、 聚异丁烯聚合物和有机硅橡胶, 总共占 45重量份。 对于增粘添加剂, 可选择 各占 3重量份的 MQ硅树脂和石油松香脂, 共占 9重量份。
导热绝缘颗粒可以为一种或更多种金属氧化物和 /或金属氮化物颗粒, 例 如选自氧化铝、 氮化硼、 氮化铝、 氧化镁和氧化锌中的一种或更多种, 所采 用的量例如为 40〜85重量份。在此, 40〜85重量份仅为优选示例, 还可以根 据实际需要进行含量的合理的变更。 作为示例, 例如可以选择 65重量份的氮 化硼颗粒。
将选择的基体材料、 低分子增粘添加剂以及导热绝缘颗粒充分混合均匀 后, 经固化成型, 就可以形成既具有良好的导热绝缘性能、 又具有粘性的导 热绝缘材料。
同样, 还可以在充分混合后的基体材料、 低分子增粘添加剂以及导热绝 缘颗粒的混合物中添加支撑用的载体, 如可为玻璃纤维布或 PEN、 PI等绝缘 聚合物膜, 来形成导热绝缘片。
具体地, 制备如上导热绝缘材料或导热绝缘片的工艺如下:
( 1 ) 提供未固化的基体材料和低分子增粘添加剂, 并将它们混合均匀。 其中, 基体选自乙烯基硅树脂、 聚异丁烯聚合物、 有机硅橡胶、 聚氨酯、 甲基丙烯酸甲酯、 有机聚硅氧垸、 丙烯酸酯和聚酰胺树脂中的一种或几种。 该基体材料的总的含量为 4〜40重量份。
低分子增粘添加剂选自 MQ硅树脂、 石油松香脂、 硅酮树脂、 多元醇、 丙烯酸乙酯、 松香和乙烯苯基醋酸树脂等中的一种或几种, 只要选择的低分 子增粘添加剂中的至少一种具有提供粘性的活性基团并具有与选择的基体材 料中至少一种相同或相类似的固化反应基团。 选择的低分子增粘添加剂的总 含量为 1〜20重量份。
可采用搅拌设备将选择的基体材料和低分子增粘添加剂混合均匀, 也可 以下将选择的基体材料和低分子增粘添加剂分别分散到石脑油等溶剂中, 再 用搅拌设备混合均匀。
(2)将导热绝缘颗粒均匀混合到选择的基体材料和低分子增粘添加剂的 混合物中。
(3 ) 如果不需要添加支撑载体, 则直接对经步骤 (2) 混合后的材料进 行固化成型。
例如在一定的温度(100〜180°C, 并不限于此)下经过一定时间(如 1〜 10分钟, 或更长时间) 进行固化成型。 固化后即形成了具有压敏粘性的导热 绝缘材料。
如果要添加支撑载体, 则本步骤中首先将经步骤(2)混合后的材料涂覆 在支撑载体 (如玻璃纤维布、 PEN或 PI) 的两面, 然后再对涂覆在聚合物膜 上的混合物进行固化。 添加了支撑载体的导热绝缘片具有更好的抗撕裂性。
已经在电子元器件上进行的实验验证, 测试证明, 本实施例的如上的导 热绝缘材料具有良好的导热绝缘性能, 并且材料表面具有粘性 (压敏粘性, 即粘性对压力敏感), 因此能够粘附在散热器和电子元器件之间, 而无需使用 双面胶带。
此外, 本实施例制备的导热绝缘材料的压敏性能的强弱可以通过控制添 加的增粘添加剂的比例来进行调节, 以适应不同使用环境的要求。 通过材料 表面具有粘性, 更好的实现了与散热器和器件的表面接触, 在保证绝缘性的 前提下, 提供了更好的导热效果。 此外, 本发明实施例采用的原位添加增粘 添加剂的方法没有对基体材料材料的绝缘性能产生任何负面影响, 并且额外 的粘结胶带或粘结剂也不需要任何额外工艺。
本实施例中, 增粘添加剂具有提供粘性的活性基团, 并具有与基体材料 这的至少一种相同的活性固化反应基团, 因此可以与基体材料完成交联固化, 并使得固化后的材料具有粘性。
在上面对本发明具体实施例的描述中,针对一种实施方式描述和 /或示出 的特征可以以相同或类似的方式在一个或更多个其它实施方式中使用, 与其 它实施方式中的特征相组合, 或替代其它实施方式中的特征。
以上所述的具体实施例, 对本发明的目的、 技术方案和有益效果进行了 进一步详细说明, 所应理解的是, 以上所述仅为本发明的具体实施例而已, 并不用于限定本发明的保护范围, 凡在本发明的精神和原则之内, 所做的任 何修改、 等同替换、 改进等, 均应包含在本发明的保护范围之内。

Claims

权利要求书
1、 一种导热绝缘材料, 其特征在于, 所述导热绝缘材料主要由如下成分 组成:
4〜40重量份的高分子基体材料;
1〜20重量份的增粘添加剂,该增粘添加剂中含有与所述高分子基体材料 中的至少一种固化活性基团相同或相类似的反应基团; 以及
40〜85重量份的导热绝缘颗粒。
2、 根据权利要求 1所述的导热绝缘材料, 其中所述高分子基体材料选自 乙烯基硅树脂、 聚异丁烯聚合物、 有机硅橡胶、 聚氨酯、 甲基丙烯酸甲酯、 有机聚硅氧垸、 丙烯酸酯和聚酰胺树脂中的一种或几种;
所述增粘添加剂选自 MQ硅树脂、 石油松香脂、 硅酮树脂、 多元醇、 丙 烯酸乙酯、 松香和乙烯苯基醋酸树脂中的一种或几种。
3、 根据权利要求 2所述的导热绝缘材料, 其中所述导热绝缘颗粒选自氧 化铝、 氮化硼、 氮化铝、 氧化镁和氧化锌中的一种或更多种。
4、 一种导热绝缘片, 其特征在于所述导热绝缘片包括:
支撑膜片; 以及
涂覆在所述支撑膜片上的导热绝缘材料, 该导热绝缘材料主要由如下成 分组成:
4〜40重量份的高分子基体材料;
1〜20重量份的增粘添加剂,该增粘添加剂中含有与所述高分子基体材料 中的至少一种固化活性基团相同或相类似的反应基团; 以及
40〜85重量份的导热绝缘颗粒。
5、 根据权利要求 4所述的导热绝缘材料, 其中所述高分子基体材料选自 乙烯基硅树脂、 聚异丁烯聚合物、 有机硅橡胶、 聚氨酯、 甲基丙烯酸甲酯、 有机聚硅氧垸、 丙烯酸酯和聚酰胺树脂中的一种或几种;
所述增粘添加剂选自 MQ硅树脂、 石油松香脂、 硅酮树脂、 多元醇、 丙 烯酸乙酯、 松香和乙烯苯基醋酸树脂中的一种或几种。
6、 根据权利要求 4所述的导热绝缘材料, 其中所述导热绝缘颗粒选自氧 化铝、 氮化硼、 氮化铝、 氧化镁和氧化锌中的一种或更多种。
7、 根据权利要求 4所述的导热绝缘材料, 其中所述支撑膜片选自玻璃纤 维布、 聚萘二甲酸乙二醇酯 PEN或聚酰亚胺 PI。
8、 一种制备导热绝缘材料的方法, 其特征在于所述方法包括如下步骤: 提供 4〜40重量份的未固化的高分子基体材料和 1〜20重量份的增粘添 加剂, 并将所述高分子基体材料和增粘添加剂混合均匀, 其中所述增粘添加 剂中含有与所述高分子基体材料中的至少一种固化活性基团相同或相类似的 反应基团;
提供 40〜85重量份的导热绝缘颗粒,并将所述导热绝缘颗粒均匀地添加 到混合后的所述高分子基体材料和增粘添加剂中; 以及
对添加了所述导热绝缘颗粒的高分子基体材料和增粘添加剂的混合物进 行固化成型。
9、 根据权利要求 8所述的方法, 其中所述高分子基体材料选自乙烯基硅 树脂、 聚异丁烯聚合物、 有机硅橡胶、 聚氨酯、 甲基丙烯酸甲酯、 有机聚硅 氧垸、 丙烯酸酯和聚酰胺树脂中的一种或几种;
所述增粘添加剂选自 MQ硅树脂、 石油松香脂、 硅酮树脂、 多元醇、 丙 烯酸乙酯、 松香和乙烯苯基醋酸树脂中的一种或几种。
10、 一种制备导热绝缘片的方法, 其特征在于所述方法包括如下步骤: 提供 4〜40重量份的未固化的高分子基体材料和 1〜20重量份的增粘添 加剂, 并将所述高分子基体材料和增粘添加剂混合均匀, 其中所述增粘添加 剂中含有与所述高分子基体材料中的至少一种固化活性基团相同或相类似的 反应基团;
提供 40〜85重量份的导热绝缘颗粒,并将所述导热绝缘颗粒均匀地添加 到混合后的所述高分子基体材料和增粘添加剂中;
提供支撑膜片, 将添加了所述导热绝缘颗粒的高分子基体材料和增粘添 加剂的混合物涂覆在所述支撑膜片上; 以及
将涂覆在所述支撑膜片上的混合物进行固化成型。
11、 根据权利要求 10所述的方法, 其中所述高分子基体材料选自乙烯基 硅树脂、 聚异丁烯聚合物、 有机硅橡胶、 聚氨酯、 甲基丙烯酸甲酯、 有机聚 硅氧垸、 丙烯酸酯和聚酰胺树脂中的一种或几种;
所述增粘添加剂选自 MQ硅树脂、 石油松香脂、 硅酮树脂、 多元醇、 丙 烯酸乙酯、 松香和乙烯苯基醋酸树脂中的一种或几种。
12、 根据权利要求 10所述的方法, 其中所述导热绝缘颗粒选自氧化铝、 氮化硼、 氮化铝、 氧化镁和氧化锌中的一种或更多种。
13、 根据权利要求 10所述的方法, 其中所述支撑膜片选自玻璃纤维布、 聚萘二甲酸乙二醇酯 PEN或聚酰亚胺 PI。
PCT/CN2011/074182 2010-08-05 2011-05-17 一种导热绝缘材料、导热绝缘片及其制备方法 WO2012016465A1 (zh)

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