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Polypropylene-polyamide thermal conductive composite material

A heat-conducting composite material and polyamide technology, applied in the field of materials, can solve the problems of affecting the thermal conductivity of materials, unsatisfactory physical properties, and low thermal conductivity of glass fibers, etc., to achieve enhanced interface bonding, low reaction conditions and equipment requirements, The effect of improving competitiveness

Inactive Publication Date: 2018-03-30
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

[0030] Preparation of Modified Glass Fiber

[0031] (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.

[0032](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.

[0033] (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.

[0034] (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 etha...

Embodiment 2

[0037] The modified glass fiber prepared in Example 1 was applied to the preparation of polypropylene-polyamide thermally conductive composite material, in the formula: 50 parts of polypropylene, 50 parts of nylon-6, 100 parts of boron nitride, 20 parts of modified glass fiber, Maleic anhydride grafted polypropylene 20 parts, antimony trioxide 15 parts, light stabilizer UV-770 0.5 parts, KH-5700.2 parts, antioxidant 1010 0.2 parts.

[0038] 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.

[0039] The thermal conductivity was tested with a DRE-2C thermal conductivity tester, and the result was 6.557W / (m·K).

Embodiment 3

[0041] The modified glass fiber prepared in Example 1 was applied to the preparation of polypropylene-polyamide thermally conductive composite material, in the formula: 50 parts of polypropylene, 70 parts of nylon-6, 80 parts of boron nitride, 30 parts of modified glass fiber, Maleic anhydride grafted polypropylene 20 parts, antimony trioxide 10 parts, light stabilizer UV-770 0.5 parts, KH-570 0.2 parts, antioxidant 1010 0.2 parts.

[0042] 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 240°C, the screw speed 350r / min, the modified glass fiber is fed into the side inlet, extruded and pelletized by a twin-screw extrusion pelletizer to make uniform pellets.

[0043] The thermal conductivity was tested with a DRE-2C thermal conductivity tester, and the result was 4.893W / (m·K).

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Abstract

The invention belongs to the field of materials, and in particular relates to a polypropylene-polyamide thermal conductive composite material. The polypropylene-polyamide thermal conductive compositematerial is prepared from the following raw materials in parts by weight: 30-70 parts of polypropylene, 30-70 parts of polyamide, 50-100 parts of thermally conductive filler, 20-40 parts of modified glass fibers, 20-30 parts of a compatibilizer, 10-15 parts of a flame retardant, 0.5-1.0 part of a light stabilizer, 0.2-0.3 part of a coupling agent and 0.2-0.3 part of an antioxidant, wherein the modified glass fibers are composite aluminum nitride obtained by carrying out surface modification on glass fibers with dopamine. The surfaces of the glass fibers are modified by using the dopamine, so that aluminum nitride particles are attached to the surfaces of the glass fibers, and the thermal conductivity of the glass fibers is further improved; furthermore, the modified glass fibers are addedinto the polypropylene-polyamide composite material, so that the thermal conductivity of composite material products is ensured while the mechanical properties of the composite material products are enhanced.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a polypropylene-polyamide heat-conducting composite material. Background technique [0002] Polypropylene (PP) is a widely used thermoplastic. Its raw materials are rich in sources, low in price, and have good comprehensive properties. It occupies an important position in plastics. Compared with polyamide, polypropylene hardly absorbs water and is not affected by the humidity of the use environment, but polypropylene has disadvantages such as large molding shrinkage and poor notched impact toughness. Polyamide (PA), commonly known as nylon, is a thermoplastic engineering plastic widely used in automobiles, electronics, machinery, instrumentation and other fields. PA has excellent wear resistance, oil resistance and wide temperature range. Its disadvantages are high water absorption, poor dimensional stability, low temperature and low dry impact strength, which largely limit ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L77/02C08L51/06C08K13/06C08K9/04C08K7/14C08K3/38C08K3/22C08K3/28C09K5/14
CPCC08L23/12C08K2003/282C08K2003/385C08K2201/003C08L77/02C08L2205/03C09K5/14C08L51/06C08K13/06C08K9/04C08K7/14C08K3/38C08K3/2279C08K3/28
Inventor 李强
Owner GAOYOU INST CO LTD DALIAN UNIV OF TECH
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