CN105385132A - PC-PET-based LED heat dissipating material containing modified boron nitride fiber-carbon nano tube powder and preparing method thereof - Google Patents

Abstract

The invention discloses a PC-PET-based LED heat dissipating material containing modified boron nitride fiber-carbon nano tube powder and a preparing method thereof. Macromolecul materials such as PC and PET are compounded to serve as heat conductive plastic base stock, and the heat conductive plastic base stock is good in comprehensive mechanical property, safe in insulation, stable in heat resistance, small in heat expansion coefficient and stable in size; added nano silicon nitride is capable of effectively improving the heat conductivity of the material, the doped boron nitride fiber-carbon nano tube compound powder modified through ionic liquid is good in dispersity and heat conductivity, good in compatibility with the plastic base stock, capable of forming a stable and efficient heat conducting network in the base stock in the step-by-step feeding processing, and therefore the good heat transferring and dissipating effects are achieved. The PC-PET-based LED heat dissipating material has broad application space in LED packaging.

Description

A kind of PC-PET base LED heat sink material containing modification boron nitride fibre-carbon nanotube and preparation method thereof

Technical field

The present invention relates to heat conduction engineering plastics technical field, particularly relate to a kind of PC-PET base LED heat sink material containing modification boron nitride fibre-carbon nanotube and preparation method thereof.

Background technology

LED is as the novel light source of a generation, there is efficient, energy-saving and environmental protection, long service life, be easy to safeguard etc. advantage, by the pre-third generation light source for incandescent light and luminescent lamp can be replaced, the working temperature of the light extraction efficiency of LED and life-span and chip has direct relation, heat dissipation problem is the subject matter that restriction packaged LED product improves power and luminous efficiency, the effective means solving LED heat dissipation problem be exactly utilize high heat conduction, high insulation, high permeability material heat is passed fast.

The heat sink material that current LED is commonly used is mainly metal aluminium or stupalith, all there are some defects in actual use in these materials, although such as aluminium base heat sink material has comparatively excellent heat-sinking capability, but its exist the moulding process cycle long, itself there is electroconductibility and the problem such as moulding is single, and although stupalith insulate, but higher than great, shaping difficulty, be unfavorable for batch production, its application is also restricted.

Composite heat-conducting plastics start to be paid close attention in the industry in recent years gradually, first plastics itself have the advantages such as good insulation, lightweight, inexpensive, various shapes, comparatively satisfied thermal conductivity can be obtained after adding the filler of high thermal conductivity wherein, it is lighter than aluminium base heat sink material quality, shaping cycle is shorter, because the filler unit price of high thermal conductivity is more expensive, and existing preparation technology makes the utilization ratio of heat conductive filler low, further increase production cost, therefore, improve existing technique, the utilization ratio improving raw material is the problem that bandit treats result.

Summary of the invention

The object of the invention is exactly the defect in order to make up prior art, provides a kind of PC-PET base LED heat sink material containing modification boron nitride fibre-carbon nanotube and preparation method thereof.

The present invention is achieved by the following technical solutions:

Containing a PC-PET base LED heat sink material for modification boron nitride fibre-carbon nanotube, this composite plastic is made up of the raw material of following weight part: PC40-50, PET10-15, maleic anhydride grafted ethene-octene copolymer 3-5, nano-silicon nitride 20-24, multi-walled carbon nano-tubes 4-6, boron nitride fibre 10-12, nano-zinc sulfide 1-2, Hydroxyethyl acrylate 2-3, hexafluorophosphate glyoxaline ion liquid 1-1.5, silane coupling agent 1-2, oxidation inhibitor 0.5-0.6, photostabilizer 0.1-0.2, deionized water 30-40.

Described a kind of PC-PET base LED heat sink material containing modification boron nitride fibre-carbon nanotube and preparation method thereof, described preparation method is:

(1) first hexafluorophosphate glyoxaline ion liquid is mixed with deionized water, and oil bath is heated to 50-60 DEG C, constant temperature is uniformly mixed 25-30min subsequently, be warming up to 70-80 DEG C subsequently, drop into boron nitride fibre, multi-walled carbon nano-tubes, thermostatic ultrasonic stirs 3-4h, stirs after terminating and gained material complete drying is removed moisture, namely obtain ion liquid modified boron nitride fibre/carbon nano-tube composite powder after gained powder grinding distribution;

(2) drop into granulation in twin screw extruder together after the silane coupling agent high-speed stirring of PC, PET, maleic anhydride grafted ethene-octene copolymer, nano-silicon nitride, nano-zinc sulfide, Hydroxyethyl acrylate, oxidation inhibitor, photostabilizer and 0.8-1 weight part being mixed, obtain a granulation material for subsequent use;

(3) composite granule step (1) prepared and the silane coupling agent of residual content are uniformly mixed for subsequent use;

(4) granulation material step (2) prepared is dropped in forcing machine by main spout, and the composite granule of step (3) adds in forcing machine by side spout, and extruding pelletization, cooling obtain the composite heat conducting material for injection moulding.

Advantage of the present invention is: the present invention is with PC, the macromolecular material compounds such as PET are as heat-conducting plastic base-material, possesses good comprehensive mechanical property, insulation safety, Heat-resistant stable, thermal expansivity is little, dimensional stabilizing, the nano-silicon nitride added effectively can improve the thermal conductivity of material, and wherein blending possess good dispersiveness and high thermal conductivity through ion liquid modified boron nitride fibre-carbon nano-tube composite powder, the consistency of itself and plastic matrix is good, the heat conduction network of stability and high efficiency can be formed in base-material in Multistep feeding process, thus obtain good heat transfer, radiating effect, it has wide application space in LED.

Embodiment

This matrix material is made up of the raw material of following weight part: PC40, PET10, maleic anhydride grafted ethene octene copolymer 3, nano-silicon nitride 20, multi-walled carbon nano-tubes 4, boron nitride fibre 10, nano-zinc sulfide 1, Hydroxyethyl acrylate 2, hexafluorophosphate glyoxaline ion liquid 1, silane coupling agent 1, oxidation inhibitor 0.5, photostabilizer 0.1, deionized water 30.

The preparation method of this heat sink material is:

(1) first hexafluorophosphate glyoxaline ion liquid is mixed with deionized water, and oil bath is heated to 50 DEG C, constant temperature is uniformly mixed 25min subsequently, be warming up to 70 DEG C subsequently, drop into boron nitride fibre, multi-walled carbon nano-tubes, thermostatic ultrasonic stirs 3h, stirs after terminating and gained material complete drying is removed moisture, namely obtain ion liquid modified boron nitride fibre/carbon nano-tube composite powder after gained powder grinding distribution;

(2) drop into granulation in twin screw extruder together after the silane coupling agent high-speed stirring of PC, PET, maleic anhydride grafted ethene octene copolymer, nano-silicon nitride, nano-zinc sulfide, Hydroxyethyl acrylate, oxidation inhibitor, photostabilizer and 0.8 weight part being mixed, obtain a granulation material for subsequent use;

(3) composite granule step (1) prepared and the silane coupling agent of residual content are uniformly mixed for subsequent use;

(4) granulation material step (2) prepared is dropped in forcing machine by main spout, and the composite granule of step (3) adds in forcing machine by side spout, and extruding pelletization, cooling obtain the composite heat conducting material for injection moulding.

The performance test results of the composite heat conducting material obtained by the present embodiment is:

Project	Index
		Tensile strength (MPa)	88.5
Flexural strength (MPa)	235
		Thermal conductivity (w/mk)	10.34
Flame retardant rating	UL94-V0
		Volume specific resistance (Ω .cm)	＞10 13

Claims (2)

1. the PC-PET base LED heat sink material containing modification boron nitride fibre-carbon nanotube, it is characterized in that, this composite plastic is made up of the raw material of following weight part: PC40-50, PET10-15, maleic anhydride grafted ethene-octene copolymer 3-5, nano-silicon nitride 20-24, multi-walled carbon nano-tubes 4-6, boron nitride fibre 10-12, nano-zinc sulfide 1-2, Hydroxyethyl acrylate 2-3, hexafluorophosphate glyoxaline ion liquid 1-1.5, silane coupling agent 1-2, oxidation inhibitor 0.5-0.6, photostabilizer 0.1-0.2, deionized water 30-40.

2. a kind of PC-PET base LED heat sink material containing modification boron nitride fibre-carbon nanotube and preparation method thereof as claimed in claim 1, it is characterized in that, described preparation method is:

(1) first hexafluorophosphate glyoxaline ion liquid is mixed with deionized water, and oil bath is heated to 50-60 DEG C, constant temperature is uniformly mixed 25-30min subsequently, be warming up to 70-80 DEG C subsequently, drop into boron nitride fibre, multi-walled carbon nano-tubes, thermostatic ultrasonic stirs 3-4h, stirs after terminating and gained material complete drying is removed moisture, namely obtain ion liquid modified boron nitride fibre/carbon nano-tube composite powder after gained powder grinding distribution;

(2) drop into granulation in twin screw extruder together after the silane coupling agent high-speed stirring of PC, PET, maleic anhydride grafted ethene-octene copolymer, nano-silicon nitride, nano-zinc sulfide, Hydroxyethyl acrylate, oxidation inhibitor, photostabilizer and 0.8-1 weight part being mixed, obtain a granulation material for subsequent use;

(3) composite granule step (1) prepared and the silane coupling agent of residual content are uniformly mixed for subsequent use;

(4) granulation material step (2) prepared is dropped in forcing machine by main spout, and the composite granule of step (3) adds in forcing machine by side spout, and extruding pelletization, cooling obtain the composite heat conducting material for injection moulding.