Novel heat-conducting nylon composite material and preparation method thereof

A technology of nylon composite materials and thermally conductive fillers, which is applied in the field of materials, can solve the problems of affecting the thermal conductivity of materials, low thermal conductivity of glass fibers, and unsatisfactory physical properties, and achieve enhanced interface bonding, low reaction conditions and equipment requirements. The effect of improving competitiveness

Inactive Publication Date: 2018-03-06
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 0.035W / (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 requirements. suitable physical properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Preparation of Modified Glass Fiber

[0026] (1) Select alkali-free glass fibers with a diameter between 12 μm and 23 μm, burn the glass fibers at 600° C. for 1 hour, wash them with deionized water three times, and dry them for later use.

[0027] (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.

[0028] (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.

[0029] (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 e...

Embodiment 2

[0032] Apply the modified glass fiber prepared in Example 1 to the preparation of heat-conducting nylon, the formula: 50 parts of nylon-6, 70 parts of boron nitride, 20 parts of modified glass fiber, 10 parts of antimony trioxide, KH-570 0.2 Parts, antioxidant 1010 0.15 parts.

[0033] 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 250°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.

[0034] The thermal conductivity was tested with a DRE-2C thermal conductivity tester, and the result was 5.216W / (m·K).

Embodiment 3

[0036]The modified glass fiber prepared in Example 1 is applied to the preparation of thermally conductive nylon. In the formula: 70 parts of nylon-6, 70 parts of boron nitride, 30 parts of modified glass fiber, 10 parts of nano-melamine cyanuric acid, KH-570 0.2 Parts, antioxidant 1010 0.2 parts.

[0037] 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 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.

[0038] The thermal conductivity was tested with a DRE-2C thermal conductivity tester, and the result was 4.108W / (m·K).

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Abstract

The invention belongs to the field of materials and in particular relates to a novel heat-conducting nylon composite material and a preparation method thereof. The novel heat-conducting nylon composite material is prepared from the following raw materials in parts by weight: 30 to 70 parts of nylon-6, 30 to 70 parts of heat-conducting filling, 10 to 30 parts of modified glass fibers, 5 to 10 partsof a flame retardant, 0.1 to 0.2 part of a coupling agent and 0.1 to 0.2 part of an antioxidant, wherein the modified glass fibers are obtained by carrying out dopamine surface modification on glassfibers and compounding aluminum nitride, and can be obtained by a blending method in a preparation process. According to the novel heat-conducting nylon composite material provided by the invention, the surfaces of the glass fibers are modified by adopting dopamine, so that aluminum nitride micro-particles are attached and the heat conductivity of the glass fibers is improved; and the modified glass fibers are added into the heat-conducting nylon, so that the mechanical properties of a heat-conducting nylon product are enhanced and the requirements on heat conductivity are ensured.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a novel heat-conducting nylon composite material and a preparation method thereof. Background technique [0002] Thermally conductive nylon is the most widely used among all thermally conductive materials because of its low price, high thermal conductivity, and superior thermal radiation performance. Especially in the emerging field of LED lighting, high-end products basically use thermally conductive nylon as heat dissipation material. Compared with traditional aluminum, plastic is easy to process, low in cost, and has better heat radiation performance. The thermal conductivity of nylon-6 (PA-66) pure resin is generally around 0.3W / (m K). After adding some thermal conductive fillers to the resin, the thermal conductivity of nylon material can reach 0.5-1.0, which meets the requirements of thermal conductive nylon products. Thermal conductivity requirements, general thermal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/02C08K13/06C08K9/04C08K9/02C08K7/14C08K3/38C08K3/22C08K5/134C08K5/3492C09K5/14
CPCC08K13/06C08K3/2279C08K3/38C08K5/1345C08K5/34928C08K7/14C08K9/02C08K9/04C08K2003/385C08K2201/011C09K5/14C08L77/02
Inventor 李强
Owner GAOYOU INST CO LTD DALIAN UNIV OF TECH
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