CN105255171A

CN105255171A - Nanometer aluminum oxide-graphite short fiber filling-modified PA6/ABS composite thermal conductive plastic for LEDs and preparation method thereof

Info

Publication number: CN105255171A
Application number: CN201510589142.0A
Authority: CN
Inventors: 夏云
Original assignee: ANHUI HEHAN OPTOELECTRONICS TECHNOLOGY Co Ltd
Current assignee: ANHUI HEHAN OPTOELECTRONICS TECHNOLOGY Co Ltd
Priority date: 2015-09-16
Filing date: 2015-09-16
Publication date: 2016-01-20

Abstract

The invention discloses a nanometer aluminum oxide-graphite short fiber filling-modified PA6/ABS composite thermal conductive plastic for LEDs and a preparation method thereof. The thermal conductive plastic employs a mixture of PA6 and ABS plastics and has excellent plasticity, durability and electric insulation performance; graphite short fiber and nanometer aluminum oxide are respectively used for thermal conduction modification of ABS and PA6, and the composites undergo melt spinning so as to prepare composite short fibers with high thermal conductivity; and conductive filling materials in the obtained composite short fibers are uniformly dispersed and the composite short fibers are more uniformly dispersed and bonded in later mixing and can form a uniform and stable heat transfer network, so the phenomenon of nonuniform heat transfer of plastics in traditional production methods can be improved and the utilization rate of the thermal conductive filling materials can be enhanced. Test results show that the composite thermal conductive plastic has excellent thermal conductivity, is safe, environment-friendly, tough and durable and can be widely used in the field of heat dissipation of the LEDs.

Description

PA6/ABS composite heat-conducting plastics that a kind of LED nano aluminium oxide-graphite staple fibre 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 PA6/ABS composite heat-conducting plastics of a kind of LED nano aluminium oxide-graphite staple fibre 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, PA6/ABS composite heat-conducting plastics providing a kind of LED nano aluminium oxide-graphite staple fibre filling-modified and preparation method thereof.

The present invention is achieved by the following technical solutions:

The PA6/ABS composite heat-conducting plastics that a kind of LED nano aluminium oxide-graphite staple fibre is filling-modified, it is characterized in that, this composite plastic is made up of the raw material of following weight part: PA6 master batch 50-60, ABS masterbatch 20-25, polyethylene maleic anhydride multipolymer 8-10, nano aluminium oxide 20-25, graphite staple fibre 10-12, polyacrylonitrile 5-8, triphenyl phosphite 0.2-0.3, antioxidant 1010 0.1-0.2, silane coupling agent 1-2, Zinic stearas 1-1.5.

The preparation method of the PA6/ABS composite heat-conducting plastics that described a kind of LED nano aluminium oxide-graphite staple fibre is filling-modified is:

(1) PA6-nano aluminium oxide conjugated fibre is prepared: be first uniformly mixed by the silane coupling agent of nano aluminium oxide and 0.8-1 weight part, subsequently itself and PA6 master batch are uniformly mixed, through melt-spinning technology, gained compound makes that length is 10-15mm, diameter is that the composite short fiber of 40-60 μm is for subsequent use;

(2) ABS-graphite staple fibre conjugated fibre is prepared: first mixed by the silane coupling agent of graphite staple fibre with residuals weight part, subsequently itself and ABS masterbatch mix and blend are uniformly dispersed, through melt-spinning technology, gained material makes that length is 20-30mm, diameter is that the composite short fiber of 20-30 μm is for subsequent use;

(3) step (1) and (2) gained composite short fiber and other leftover materials are mixed in rear input Banbury mixer, in 240-250 DEG C of condition blended banburying 1-2h discharging, obtain described composite heat-conducting plastics.

Beneficial effect: the present invention is used in combination by PA6 and ABS, the matrix material of gained combines both advantages, there is good mechanical property, it is in plasticity-, weather resistance, the performance of electric insulating quality aspect is excellent, utilize graphite staple fibre and nano aluminium oxide respectively to ABS, PA6 carries out heat conduction modification, matrix material has made the conjugated fibre of high heat conduction through the technique of melt-spinning, in this conjugated fibre, heat conductive filler is uniformly dispersed, and the more even of combination is disperseed 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 heat-conducting effect, and safety and environmental protection, tough durable, LED field of radiating can be widely used in.

Embodiment

The composite plastic of this embodiment is prepared by the raw material of following weight part: PA6 master batch 55, ABS masterbatch 25, polyethylene maleic anhydride copolymer 10, nano aluminium oxide 25, graphite staple fibre 12, polyacrylonitrile 6, triphenyl phosphite 0.2, antioxidant 1010 0.1, silane coupling agent 1.5, Zinic stearas 1.2.

(1) PA6-nano aluminium oxide conjugated fibre is prepared: be first uniformly mixed by the silane coupling agent of nano aluminium oxide and 0.8 weight part, subsequently itself and PA6 master batch are uniformly mixed, through melt-spinning technology, gained compound makes that length is 15mm, diameter is that the composite short fiber of 50 μm is for subsequent use;

(2) ABS-graphite staple fibre conjugated fibre is prepared: first mixed by the silane coupling agent of graphite staple fibre with residuals weight part, subsequently itself and ABS masterbatch mix and blend are uniformly dispersed, through melt-spinning technology, gained material makes that length is 30mm, diameter is that the composite short fiber of 25 μm is for subsequent use;

(3) step (1) and (2) gained composite short fiber and other leftover materials are mixed in rear input Banbury mixer, in 250 DEG C of condition blended banburying 1h discharging, obtain 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)	34.2
Flexural strength (MPa)	880
		Thermal conductivity (w/mk)	16.8
Flame retardant rating	UL94-V0
		Volume specific resistance (10 ²¹Ω.cm）	3.8

Claims

1. the PA6/ABS composite heat-conducting plastics that LED nano aluminium oxide-graphite staple fibre is filling-modified, it is characterized in that, this composite plastic is made up of the raw material of following weight part: PA6 master batch 50-60, ABS masterbatch 20-25, polyethylene maleic anhydride multipolymer 8-10, nano aluminium oxide 20-25, graphite staple fibre 10-12, polyacrylonitrile 5-8, triphenyl phosphite 0.2-0.3, antioxidant 1010 0.1-0.2, silane coupling agent 1-2, Zinic stearas 1-1.5.

2. PA6/ABS composite heat-conducting plastics that a kind of LED nano aluminium oxide-graphite staple fibre as claimed in claim 1 is filling-modified and preparation method thereof, its spy is, described preparation method is: