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Polypropylene composite material with high heat conductivity

A technology of composite materials and polypropylene, applied in the field of materials, can solve the problems of low thermal conductivity of glass fibers, affect the thermal conductivity of materials, and fail to meet physical properties, meet the requirements of low reaction conditions and equipment, enhance interface bonding, and improve The effect of competitiveness

Inactive Publication Date: 2018-04-03
GAOYOU INST CO LTD DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thermal conductivity of glass fiber is too low, only 0.035 (W / m-K). If the amount of glass fiber added is too high, it will seriously affect the thermal conductivity of the material. If the amount of glass fiber added is too low, it cannot meet the appropriate requirements. physical properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of Modified Glass Fiber

[0029] (1) Select alkali-free glass fibers with a diameter between 6 μm and 9 μm, burn the glass fibers at 600° C. for 1 hour, wash them with deionized water three times, and dry them for later use.

[0030] (2) Add dopamine to deionized water to prepare a 2 g / L dopamine aqueous solution, and adjust the pH to 8.5 with Tris-HCl.

[0031] (3) Add the pretreated glass fiber into the dopamine aqueous solution and perform magnetic stirring for 24 hours, then filter the glass fiber and wash it with deionized water, and dry it at 60° C. to obtain the dopamine-modified glass fiber.

[0032] (4) Add aluminum nitride powder with an average particle size of 1.50 μm into ethanol solvent and add stearic acid with 10% mass of aluminum nitride powder, stir evenly and let stand for 2 hours, then add 3% mass of aluminum nitride powder Tween 80, stirred at 60°C for 4 hours, and finally the filtered aluminum nitride powder was washed 3 times with eth...

Embodiment 2

[0035] Apply the modified glass fiber prepared in Example 1 to the preparation of heat-conducting polypropylene, in the formula: 50 parts of polypropylene, 70 parts of boron nitride, 20 parts of modified glass fiber, 10 parts of antimony trioxide, light stabilizer UV -7700.3 parts, KH-570 0.2 parts, antioxidant 1010 0.15 parts.

[0036] When preparing, put other raw materials except modified glass fiber into the mixer and mix them for 20 minutes to make them fully mixed, and then put the mixture into the twin-screw extruder granulator for melting, the processing temperature is 200°C, the screw speed 300r / min, the modified glass fiber is fed into the side inlet, extruded and pelletized by a twin-screw extrusion pelletizer to make uniform pellets.

[0037] The thermal conductivity was tested with a DRE-2C thermal conductivity tester, and the result was 7.341W / (m·K).

Embodiment 3

[0039] The modified glass fiber prepared in Example 1 is applied to the preparation of heat-conducting polypropylene. In the formula: 70 parts of polypropylene, 70 parts of boron nitride, 30 parts of modified glass fiber, 10 parts of antimony trioxide, light stabilizer UV -7700.5 parts, KH-570 0.2 parts, antioxidant 1010 0.2 parts.

[0040] When preparing, put other raw materials except modified glass fiber into the mixer and mix them for 20 minutes to make them fully mixed, then put the mixture into the twin-screw extruder granulator for melting, the processing temperature is 220°C, the screw speed 300r / min, the modified glass fiber is fed into the side inlet, extruded and pelletized by a twin-screw extrusion pelletizer to make uniform pellets.

[0041] The thermal conductivity was tested with a DRE-2C thermal conductivity tester, and the result was 5.330W / (m·K).

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Abstract

The invention belongs to the field of materials, and particularly relates to a polypropylene composite material with high heat conductivity. The polypropylene composite material is prepared from the following raw materials: 30 to 70 parts of polypropylene, 30 to 70 parts of a heat conduction filler, 10 to 30 parts of modified glass fiber, 5 to 10 parts of a flame retardant, 0.2 to 0.5 part of a light stabilizer, 0.1 to 0.2 part of a coupling agent and 0.1 to 0.2 part of an antioxidant. The modified glass fiber is obtained by performing surface modification on glass fiber with dopamine and thencompounding the modified glass fiber with aluminum nitride. According to the polypropylene composite material with the high heat conductivity, after the glass fiber is subjected to the surface modification with the dopamine, aluminum nitride particles are attached to the glass fiber, thereby improving the heat conductivity of the glass fiber; the modified glass fiber is added into the heat conduction polypropylene, so that the mechanical property of a heat conduction polypropylene product is improved, and a requirement for the heat conductivity is guaranteed.

Description

technical field [0001] The invention belongs to the field of materials, in particular to a polypropylene composite material with high thermal conductivity. Background technique [0002] Polymer-based composites have been widely used due to their light weight, easy processing, wear resistance, simple preparation, and easy industrialization. However, the thermal conductivity of most polymer materials is extremely low. If a certain thermal conductivity is endowed to polymer materials, the application fields of polymer materials can be greatly expanded. Polypropylene (PP) is a semi-crystalline thermoplastic. It has high impact resistance, strong mechanical properties, and resistance to various organic solvents and acid and alkali corrosion. It is widely used in industry and is one of the common polymer materials. At present, as a heat dissipation component of LED lighting fixtures, it is an emerging technology trend in the field of LED lighting. Thermally conductive polymer c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L23/14C08K13/06C08K3/38C08K9/04C08K7/14C08K3/22C08K5/5425C08K5/134C08K3/28
CPCC08L23/12C08K2003/282C08K2003/385C08L23/14C08L2205/02C08K13/06C08K3/38C08K9/04C08K7/14C08K3/2279C08K5/5425C08K5/1345C08K3/28
Inventor 李强
Owner GAOYOU INST CO LTD DALIAN UNIV OF TECH
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