A star-branched polyamide-based thermally conductive composite material and its preparation method

Abstract

The invention discloses a star-branched polyamide heat conduction composite material. The star-branched polyamide heat conduction composite material comprises the following components in parts by weight: 5-90 parts of star-branched polyamide resin composition, 5-94.5 parts of heat conduction padding, 0.2-1.5 parts of lubricant, 0.2-1.5 parts of antioxidant, and 0.1-2 parts of coupling agent. The star-branched polyamide resin composition is taken as a matrix resin, so that the dispersity and compatibility of the padding in the matrix resin are improved, the regularity of accumulation of the padding in state of aggregation of the material is effectively improved, and the product has high melt fluidity and is easy to manufacture and shape. Due to good heat stability and special degradation crosslinking property of the star-branched polyamide resin composition, the heat conduction material is endowed with the property of resisting thermal aging for long, and the service life of the heat conduction material is prolonged. The star-branched polyamide heat conduction composite material also has excellent heat conduction efficiency and heat conduction property and high heat diffusion coefficient, and holds both high heat conduction property and good comprehensive mechanical property.

Description

technical field

[0001] The invention relates to the field of polymer materials, in particular to a star-branched polyamide-based heat-conducting composite material, and also relates to a preparation method of the star-shaped branched polyamide-based heat-conducting composite material. Background technique

[0002] With the popularity of electronic products, people have higher and higher requirements for electronic products, and the thermal conductivity of electronic products is one of them. The increase of circuit density and load will cause the plastic products in the electronic components to generate a lot of heat during operation. fire. Therefore, there is a need to improve the thermal conductivity of plastics. Metal and plastic heat-conducting materials are currently used as heat-conducting materials. Although metal heat-conducting materials have excellent heat-conducting properties, they have disadvantages such as large specific weight, no corrosion resistance, high p...

Examples

preparation example Construction

[0033] The thermally conductive filler in the present invention is a commonly used thermally conductive filler in the preparation process of conductive materials, without limitation, specifically selected from magnesium oxide, spherical alumina, quasi-spherical alumina, aluminum nitride, boron nitride, carbon nanotubes, graphite, Graphene, halloysite or silicon carbide, as a specific embodiment, the above-mentioned thermally conductive fillers can be used in combination of one or more of them.

[0034] In the present invention, the antioxidant is selected from any one or a combination of hindered phenolic antioxidants and phosphite antioxidants, which has good antioxidant effect, high thermal stability, and can well inhibit The thermo-oxidative degradation of the product can be well compatible with other raw materials of the present invention at the same time. When the two are used in combination, a synergistic effect can occur, which can better inhibit the thermo-oxidative de...

Embodiment 1

[0043] A preparation method of a star-branched polyamide-based thermally conductive composite material, comprising the following steps:

[0044] S1 Weigh 5 parts of star-branched polyamide resin composition, 5 parts of magnesium oxide, 0.2 parts of PETS, 0.2 parts of hindered phenolic antioxidant and 0.1 parts of silane coupling agent KH7920. The polyamide resin composition consists of 3 parts of star-branched polyamide 11 (star-branched nylon 11) and 2 parts of polyamide 6 (nylon 6). Magnesium oxide can be made of halloysite, carbon nanotubes or silicon carbide replace;

[0045] S2 adds thermally conductive fillers and coupling agents to the high-speed mixer for mixing, and after mixing evenly, adds the star-shaped branched polyamide resin composition, lubricant and antioxidant to the high-speed mixer and mixes;

[0046] S3 The material obtained in step S2 is passed into a screw extruder for melt extrusion, and then after traction, cooling, and pelletizing processes, a star-...

Embodiment 2

[0049] Compared with Example 1, the difference of this example is: 30 parts of star branched polyamide resin composition, 68 parts of thermally conductive filler, 0.5 part of fatty acid amide, 1.0 part of phosphite antioxidant and 0.5 part of KH5600, Among them, the star-branched polyamide resin composition consists of 10 parts of star-branched polyamide 6 (star-branched nylon 6) and 20 parts of polyamide 66 (nylon 66), and the thermally conductive filler consists of 55 parts of oxidized Composed of magnesium and 13 parts of spherical alumina, the thermally conductive filler can also be replaced by any two of the above-mentioned ones in the present invention.

[0050] And the temperature at the rear of the barrel of the screw extruder is 240°C, the temperature at the middle of the barrel is 260°C, the temperature at the front of the barrel is 275°C, and the screw speed is 250r / min.

technical field

[0001] The invention relates to the field of polymer materials, in particular to a star-branched polyamide-based heat-conducting composite material, and also relates to a preparation method of the star-shaped branched polyamide-based heat-conducting composite material. Background technique

[0002] With the popularity of electronic products, people have higher and higher requirements for electronic products, and the thermal conductivity of electronic products is one of them. The increase of circuit density and load will cause the plastic products in the electronic components to generate a lot of heat during operation. fire. Therefore, there is a need to improve the thermal conductivity of plastics. Metal and plastic heat-conducting materials are currently used as heat-conducting materials. Although metal heat-conducting materials have excellent heat-conducting properties, they have disadvantages such as large specific weight, no corrosion resistance, high p...

Examples

preparation example Construction

[0033] The thermally conductive filler in the present invention is a commonly used thermally conductive filler in the preparation process of conductive materials, without limitation, specifically selected from magnesium oxide, spherical alumina, quasi-spherical alumina, aluminum nitride, boron nitride, carbon nanotubes, graphite, Graphene, halloysite or silicon carbide, as a specific embodiment, the above-mentioned thermally conductive fillers can be used in combination of one or more of them.

[0034] In the present invention, the antioxidant is selected from any one or a combination of hindered phenolic antioxidants and phosphite antioxidants, which has good antioxidant effect, high thermal stability, and can well inhibit The thermo-oxidative degradation of the product can be well compatible with other raw materials of the present invention at the same time. When the two are used in combination, a synergistic effect can occur, which can better inhibit the thermo-oxidative de...

Embodiment 1

[0043] A preparation method of a star-branched polyamide-based thermally conductive composite material, comprising the following steps:

[0044] S1 Weigh 5 parts of star-branched polyamide resin composition, 5 parts of magnesium oxide, 0.2 parts of PETS, 0.2 parts of hindered phenolic antioxidant and 0.1 parts of silane coupling agent KH7920. The polyamide resin composition consists of 3 parts of star-branched polyamide 11 (star-branched nylon 11) and 2 parts of polyamide 6 (nylon 6). Magnesium oxide can be made of halloysite, carbon nanotubes or silicon carbide replace;

[0045] S2 adds thermally conductive fillers and coupling agents to the high-speed mixer for mixing, and after mixing evenly, adds the star-shaped branched polyamide resin composition, lubricant and antioxidant to the high-speed mixer and mixes;

[0046] S3 The material obtained in step S2 is passed into a screw extruder for melt extrusion, and then after traction, cooling, and pelletizing processes, a star-...

Embodiment 2

[0049] Compared with Example 1, the difference of this example is: 30 parts of star branched polyamide resin composition, 68 parts of thermally conductive filler, 0.5 part of fatty acid amide, 1.0 part of phosphite antioxidant and 0.5 part of KH5600, Among them, the star-branched polyamide resin composition consists of 10 parts of star-branched polyamide 6 (star-branched nylon 6) and 20 parts of polyamide 66 (nylon 66), and the thermally conductive filler consists of 55 parts of oxidized Composed of magnesium and 13 parts of spherical alumina, the thermally conductive filler can also be replaced by any two of the above-mentioned ones in the present invention.

[0050] And the temperature at the rear of the barrel of the screw extruder is 240°C, the temperature at the middle of the barrel is 260°C, the temperature at the front of the barrel is 275°C, and the screw speed is 250r / min.