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Waterborne polyurethane composite material with high thermal conductivity and preparation method thereof

A technology of water-based polyurethane and composite materials, applied in the direction of polyurea/polyurethane adhesives, non-polymer adhesive additives, adhesive types, etc. The effect of good performance, excellent mechanical performance and excellent performance

Pending Publication Date: 2022-02-15
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] First of all, graphene has a very high thermal conductivity of 5300W / (m·K). This is because of the unique structure of graphene, which is a two-dimensional periodic hexagonal ring honeycomb layered structure composed of carbon. Graphene relies on its unique acoustic The sub-mode for heat transfer is currently the best matrix widely used in filling composite materials. However, if the high-mass fraction filler is easy to agglomerate in the resin matrix, it is difficult to disperse uniformly in the matrix, resulting in a decrease in thermal conductivity. Therefore, In order to solve the dispersion problem of graphene, we usually need to modify the surface of graphene to solve the dispersion problem, and then prepare composite materials through the composite method of solution mixing. The functionalization of graphene is generally by functionalizing graphene oxide and then reducing it. achieved by

Method used

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  • Waterborne polyurethane composite material with high thermal conductivity and preparation method thereof
  • Waterborne polyurethane composite material with high thermal conductivity and preparation method thereof
  • Waterborne polyurethane composite material with high thermal conductivity and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] a. Main reaction raw materials and proportion composition:

[0036] raw material mass (g) millimole (mmol) Isophorone diisocyanate 6.72 30.24 Modified Graphene Oxide Powder 0.17 14.15 Dimethylolpropionic acid 0.84 6.25 1,4-Butanediol 0.79 8.4 Triethylamine 0.633 6.24 Dibutyltin dilaurate 0.15 0.25 Deionized water 39.9 2215 Trimethylolpropane 0.168 1.25 Polytetrahydrofuran ether diol 8.29 8.29

[0037] The reaction raw material diisocyanate is isophorone diisocyanate, the modified graphene oxide powder is modified by 3-aminopropyltriethoxysilane, the hydrophilic chain extender is dimethylol propionic acid, and small molecule chain extension The agent is 1,4-butanediol, the neutralizing agent is triethylamine, the organotin catalyst is dibutyltin dilaurate, deionized water, the internal crosslinking agent is trimethylolpropane, and the hydroxyl-terminated diol is polytetrahydrofuran Ether gly...

Embodiment 2

[0044] Compared with Example 1, the above-mentioned steps are not changed, but the addition amount of G2 is changed, and the addition amount is 0.343gG2 Acetone dispersion liquid, promptly obtains composite water-based polyurethane emulsion, is recorded as ARGO-WPU-2, its solidification Content, particle size, and stability were tested, and the solid content of the emulsion was 30.8%, the average particle size of the emulsion was 48.22mm, and the emulsion was centrifugally stable. Then take the emulsion and pour it into a circular tetrachlorethylene mold with a diameter of 4 cm, dry it at room temperature for 48 hours, and then dry it in a vacuum oven for 24 hours to obtain a waterborne polyurethane composite material with a mass fraction of 2% and high thermal conductivity. It is tested for thermal conductivity, water absorption, tensile strength, elongation at break, and pencil hardness. When the mass fraction is 2%, the thermal conductivity of the composite film is 0.62W / (m...

Embodiment 3

[0046] Compared with Example 1, the above-mentioned steps are not changed, but the addition amount of G2 is changed, and the addition amount is 0.520gG2 Acetone dispersion liquid, promptly obtains composite water-based polyurethane emulsion, is recorded as ARGO-WPU-3, its solidification Content, particle size, and stability were tested, and the solid content of the emulsion was 32.1%, the average particle size of the emulsion was 57.55mm, and the emulsion was stable in centrifugation. Then take the emulsion and pour it into a circular tetrachlorethylene mold with a diameter of 4 cm, dry it at room temperature for 48 hours, and then dry it in a vacuum oven for 24 hours to obtain a waterborne polyurethane composite material with a mass fraction of 3% and high thermal conductivity. It is tested for thermal conductivity, water absorption, tensile strength, elongation at break, and pencil hardness. When the mass fraction is 3%, the thermal conductivity of the composite film is 0.65...

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Abstract

The invention discloses a waterborne polyurethane composite material with high thermal conductivity. Firstly, a cross-linking waterborne polyurethane composite emulsion is prepared from macromolecular dihydric alcohol, diisocyanate, a hydrophilic chain extender, a micromolecular chain extender, a neutralizer, deionized water, modified graphene powder and an internal cross-linking agent. The average colloidal particle size of the prepared waterborne polyurethane composite emulsion is 40.00-60.00 mm, the solid content is about 30%, and the centrifugal stability of the composite emulsion is very good. After the composite emulsion is dried to form a film, the pencil hardness is 1H-2H, the water absorption rate is 20-40%, the ethanol swelling rate is 10-35%, the tensile strength is 10-25MPa, the elongation at break is 500-800%, and the heat conductivity coefficient is 0.3-0.7 W / (m.K). When the filling mass fraction is 3%, the heat conductivity coefficient of the composite adhesive film is 0.65 W / (m.K), the tensile strength is 17.9 MPa, the elongation at break is 754%, and at the moment, the waterborne polyurethane composite film is excellent in performance in all aspects.

Description

technical field [0001] The invention belongs to the field of heat-conducting resin materials, and in particular relates to a water-based polyurethane composite material with high heat-conducting performance and a preparation method thereof. Background technique [0002] With the rapid development of microelectronics integration and assembly technology, electronic equipment and components are increasingly miniaturized, multi-functional, and efficient, and their operating frequency increases sharply. As a result, the heat generated by the device during operation will increase sharply, resulting in A sharp rise in temperature will also cause the ambient temperature to rise continuously. If the generated heat cannot be released in time, the reliability of electronic equipment and electronic components will be greatly affected, and the service life will be greatly shortened. And it will also threaten the safety of the circuit. Therefore, in order to ensure the continuous, stabl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C09J11/04C09J7/10C08G18/32C08G18/34C08G18/48C08G18/66
CPCC09J175/08C09J11/04C09J7/10C08G18/6692C08G18/4854C08G18/348C08G18/3206C09J2301/408C09J2203/326C08K9/06C08K3/042
Inventor 吴淑英赵玉金吴志民薛耀宗
Owner XIANGTAN UNIV
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