CN105238044A - Graphene oxide-nanometer aluminium nitride filled modified PPS/PBT composite heat-conduction plastic for LED and preparation method thereof - Google Patents

Abstract

The invention discloses graphene oxide-nanometer aluminium nitride filled modified PPS/PBT composite heat-conduction plastic for LED and a preparation method thereof. The heat-conduction plastic employs PPS plastic and PBT plastic for mixed usage, integrates advantages of the two kinds of plastic, and possesses good mechanical properties and heat-resistant anticorrosion efficacies. Graphene oxide and nanometer aluminium oxide are utilized for respectively modifying PBT and PPS. In order to improve the dispersity of a heat-conduction material in resin, composite short fiber is prepared by employing a fusion spinning technology, and the two kinds of composite short fiber are relatively uniformly dispersed and combined at the late-stage mixing process, a uniform stable heat transferring network is formed, the heat-conduction nonuniform phenomenon brought by a conventional production method is obviously improved, and the utilization rate of a heat-conduction filling material is improved. Test results show that the composite heat-conduction plastic possesses excellent heat conductivity, stable heat resistance, safety and friendliness to environment, and is widely applicable to LED heat-radiation field.

Description

PPS/PBT composite heat-conducting plastics that a kind of LED graphene oxide-nano aluminum nitride is filling-modified and preparation method thereof

Technical field

The present invention relates to heat-conducting plastic preparing technical field, particularly relate to filling-modified PPS/PBT composite heat-conducting plastics of a kind of LED graphene oxide-nano aluminum nitride and preparation method thereof.

Background technology

LED is as the novel light source of a generation, and the working temperature of its light extraction efficiency and life-span and chip has direct relation, and heat dissipation problem is always the focus paid close attention to.No matter LED chip encapsulates or Design of Luminaires application, often need to discharge by thermally conductive material the heat that LED produces, cost for dispelling the heat also occupies the proportion of system cost about 20% ~ 30%, and the Cooling Solution seeking high performance-price ratio also becomes the target of dealer's pursuit always.

At present in LED illumination light source and light fixture are produced, main employing metal aluminium or stupalith are as heat conduction and heat radiation system, but, 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, 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.

Organic heat-conducting plastic starts 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, production for LED illumination product provides a kind of new thinking and solution, the difficult point of heat-conducting plastic is to improve its thermal conductivity, traditional production method mainly by the plastic directly the blended banburying of blending height heat conductive filler extrude and obtain, this method produces the problem that the heat conduction of heat-conducting plastic ubiquity is uneven, filler utilization ratio is low obtained, and its comprehensive heat conduction and heat radiation effect is still to be modified.

Summary of the invention

The object of the invention is exactly the defect in order to make up prior art, PPS/PBT composite heat-conducting plastics providing a kind of LED graphene oxide-nano aluminum nitride filling-modified and preparation method thereof.

The present invention is achieved by the following technical solutions:

The PPS/PBT composite heat-conducting plastics that a kind of LED graphene oxide-nano aluminum nitride is filling-modified, it is characterized in that, this composite plastic is made up of the raw material of following weight part: PPS master batch 70-80, PBT master batch 25-30, graphene oxide 10-15, triphenyl phosphite 0.2-0.3, antioxidant 1010 0.1-0.2, nano aluminum nitride 25-30, silane coupling agent 1-2, calcium zinc stabilizer 1-1.5.

The preparation method of the PPS/PBT composite heat-conducting plastics that described a kind of LED graphene oxide-nano aluminum nitride is filling-modified is:

(1) PBT-graphene oxide conjugated fibre is prepared: be first uniformly mixed by the silane coupling agent of graphene oxide and 0.2-0.3 weight part, subsequently itself and PBT master batch are uniformly mixed, through melt-spinning technology, gained compound makes that length is 20-30mm, diameter is that the composite short fiber of 50-80 μm is for subsequent use;

(2) PPS-nano aluminum nitride conjugated fibre is prepared: first mixed by the silane coupling agent of nano aluminum nitride with residuals weight part, subsequently itself and PPS master batch mix and blend are uniformly dispersed, through melt-spinning technology, gained material makes that length is 10-20mm, diameter is that the composite short fiber of 60-100 μm is for subsequent use;

(3) mix in rear input twin screw extruder by step (1) and (2) gained composite short fiber and other leftover materials, extruding pelletization under 240-250 DEG C of condition, obtains described composite heat-conducting plastics.

Beneficial effect: the present invention by PPS plastics and PBT plastic used in combination, combine both advantages, there is good mechanical property and heat-resistant anticorrosive loses effect, and utilize graphene oxide and nano aluminum nitride respectively to PBT, PPS carries out heat conduction modification, dispersed in resin in order to improve thermally conductive material, the technique of melt-spinning is adopted to be made into composite short fiber, and these two kinds of composite short fibers disperse the more even of combination in later stage mixing process, uniform and stable heat trnasfer network can be formed, significantly can improve the phenomenon of the plastics heat conduction inequality that conventional production methods is brought, improve heat conductive filler utilization ratio, test result shows that this composite heat-conducting plastics have excellent thermal conductivity, Heat-resistant stable, safety and environmental protection, LED field of radiating can be widely used in.

Embodiment

Embodiment

The composite plastic of this embodiment is prepared by the raw material of following weight part: PPS master batch 75, PBT master batch 28, graphene oxide 12, triphenyl phosphite 0.2, antioxidant 1010 0.1, nano aluminum nitride 28, silane coupling agent 1.5, calcium zinc stabilizer 1.2.

The preparation method of the PPS/PBT composite heat-conducting plastics that described a kind of LED graphene oxide-nano aluminum nitride is filling-modified is:

(1) PBT-graphene oxide conjugated fibre is prepared: be first uniformly mixed by the silane coupling agent of graphene oxide and 0.2 weight part, subsequently itself and PBT master batch are uniformly mixed, through melt-spinning technology, gained compound makes that length is 25mm, diameter is that the composite short fiber of 70 μm is for subsequent use;

(2) PPS-nano aluminum nitride conjugated fibre is prepared: first mixed by the silane coupling agent of nano aluminum nitride with residuals weight part, subsequently itself and PPS master batch mix and blend are uniformly dispersed, through melt-spinning technology, gained material makes that length is 15mm, diameter is that the composite short fiber of 80 μm is for subsequent use;

(3) mix in rear input twin screw extruder by step (1) and (2) gained composite short fiber and other leftover materials, extruding pelletization under 245 DEG C of conditions, obtains described composite heat-conducting plastics.

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

Project	Index
		Resistance to impact shock (KJ/m 2)	30.2
Flexural strength (MPa)	832
		Thermal conductivity (w/mk)	15.4
Flame retardant rating	UL94-V0
		Volume specific resistance (10 21Ω.cm）	3.5

Claims (2)

1. the PPS/PBT composite heat-conducting plastics that LED graphene oxide-nano aluminum nitride is filling-modified, it is characterized in that, this composite plastic is made up of the raw material of following weight part: PPS master batch 70-80, PBT master batch 25-30, graphene oxide 10-15, triphenyl phosphite 0.2-0.3, antioxidant 1010 0.1-0.2, nano aluminum nitride 25-30, silane coupling agent 1-2, calcium zinc stabilizer 1-1.5.

2. PPS/PBT composite heat-conducting plastics that a kind of LED graphene oxide-nano aluminum nitride as claimed in claim 1 is filling-modified and preparation method thereof, its spy is, described preparation method is:

(1) PBT-graphene oxide conjugated fibre is prepared: be first uniformly mixed by the silane coupling agent of graphene oxide and 0.2-0.3 weight part, subsequently itself and PBT master batch are uniformly mixed, through melt-spinning technology, gained compound makes that length is 20-30mm, diameter is that the composite short fiber of 50-80 μm is for subsequent use;

(2) PPS-nano aluminum nitride conjugated fibre is prepared: first mixed by the silane coupling agent of nano aluminum nitride with residuals weight part, subsequently itself and PPS master batch mix and blend are uniformly dispersed, through melt-spinning technology, gained material makes that length is 10-20mm, diameter is that the composite short fiber of 60-100 μm is for subsequent use;

(3) mix in rear input twin screw extruder by step (1) and (2) gained composite short fiber and other leftover materials, extruding pelletization under 240-250 DEG C of condition, obtains described composite heat-conducting plastics.