CN104829985A

CN104829985A - Teflon-based polyaniline-doped heat radiation material for LED light source and preparation method thereof

Info

Publication number: CN104829985A
Application number: CN201510160494.4A
Authority: CN
Inventors: 张英才; 刘德时
Original assignee: Anhui Bo Chang Electronics Technology Limited-Liability Co
Current assignee: Mingguang Taiyuan Security Technology Co. Ltd.
Priority date: 2015-04-07
Filing date: 2015-04-07
Publication date: 2015-08-12

Abstract

The invention relates to a LED heat radiation material and especially relates to a Teflon-based polyaniline-doped heat radiation material for a LED light source and a preparation method thereof. The Teflon-based polyaniline-doped heat radiation material is prepared from 2-3 parts by weight of mesocarbon microbeads, 3-5 parts by weight of silica sol with solid content of 40-50%, 5-6 parts by weight of polyaniline fibers, 30-40 parts by weight of an ethanol aqueous solution with content of 5%, 3-5 parts by weight of sodium silicate, 4-5 parts by weight of crystalline flake graphite, 16-20 parts by weight of aluminum nitride micro-powder of 400-600 meshes, 40-50 parts by weight of Teflon micro-powder of 200-300 meshes and 2-3 parts by weight of an assistant. The LED heat radiation material has the advantages of uniform and stable thermal conductivity, environment corrosion resistance, light aging resistance, cleanliness, stain resistance, safety, insulation, cutting easiness and high raw material utilization rate and is an ideal LED lamp heat radiation material.

Description

A kind of LED light source polytetrafluoroethylene (PTFE) base doped polyaniline heat sink material and preparation method thereof

Technical field

The present invention relates to LED heat sink material, be specifically related to a kind of LED light source polytetrafluoroethylene (PTFE) base doped polyaniline heat sink material and preparation method thereof and production method thereof.

Background technology

LED is the abbreviation of photodiode, be a kind of be the semiconductor electronic component of luminous energy by electric energy conversion, there is volume little, life-span is long, current consumption is low, speed of response is fast, luminous efficiency is high, the advantages such as energy-conserving and environment-protective, it is the product of the most competitive power of the conventional light source as an alternative of generally acknowledging in the industry, also be widely used in real life, still there is many problems in current LED product, wherein heat dissipation problem is the most important thing always, common heat sink material mostly is high-thermal conductive metal, high heat conduction inorganic materials and the composite sintering of these materials form, it is large to there is excision forming difficulty in these materials, cost is higher, be subject to the shortcomings such as environmental corrosion, and with plastics and the composite heat sink material made of heat conductive filler, good radiating effect can be played, the environmental compatibility of material can be improved again, reach the use properties of efficient stable.

Tetrafluoroethylene has high temperature resistant, resistance to chemical attack, the plurality of advantages such as easy to clean, is described as the king of plastics; Aluminium nitride good heat conductivity, thermal expansivity is little, and the heat sink material being base-material mixed sintering with both can make up the defect that traditional LED dispels the heat, and has outstanding use properties.

Summary of the invention

The object of the invention is to, provide a kind of LED light source polytetrafluoroethylene (PTFE) base doped polyaniline heat sink material and preparation method thereof, to achieve these goals, the technical solution used in the present invention is as follows:

A kind of LED light source polytetrafluoroethylene (PTFE) base doped polyaniline heat sink material and preparation method thereof, it is characterized in that, material of the present invention is made up of the raw material of following weight part: MCMB 2-3, solid content are silicon sol 3-5, the polyaniline fiber 5-6 of 15-20%, 5% aqueous ethanolic solution 30-40, water glass 3-5, crystalline flake graphite 4-5,400-600 order aluminium nitride micro mist 20-25,200-300 order ptfe micropowder 40-50, auxiliary agent 2-3.

Described auxiliary agent is made up of the raw material of following weight part: silane coupling agent kh550 6-8, potassium methyl silicate 1-2, titanium acetylacetone (25% isopropanol water solution) 1-3, nano silicon 3-4, sodium hydroxide 0.1-0.2, water 20-25, preparation method is: be first dissolved in by sodium hydroxide in appropriate water, be mixed with the solution that pH value is 10-11, add nano silicon subsequently, ultrasonic immersion 40-50min, powder after alkaline purification is washed to neutral rear dry, and add water and be mixed with colloidal sol, again other leftover materials are mixed with the silicon dioxide gel of preparation subsequently, high-speed stirring dispersion 60-80min, obtain.

Described a kind of LED light source polytetrafluoroethylene (PTFE) base doped polyaniline heat sink material and preparation method thereof, its preparation method is:

(1) first by MCMB, crystalline flake graphite and silicon sol mixed grinding 20-30min, subsequently by mixed slurry drying removing moisture, gained micro mist is for subsequent use;

(2) water glass is dropped in aqueous ethanolic solution, be stirred to after it dissolves completely, drop into ptfe micropowder, continue dispersed with stirring 40-50min, then step (1) gained material and other leftover materials are added, mixed grinding dispersion 2-3h, compression moulding after material mixes completely, shaping rear base substrate blowing 15-20h under 50-60 DEG C of condition, remove moisture completely, gained base substrate fires 30-40min under 350-380 DEG C of condition, is cooled to room temperature subsequently, to obtain final product.

The invention has the advantages that: using water glass-aqueous ethanolic solution as binding agent, effective wetting polytetrafluoroethylene powder surface, improve the cohesive force between raw material, in advance through MCMB and the crystalline flake graphite of the coated process of silicon sol, dispersed raising in base-material, further increase the heat conduction and heat radiation ability of material, the polyaniline fiber of doping has excellent thermoelectricity capability, and stable performance, inexpensive light weight; The auxiliary agent added helps effect that raw material is compatible, help sintering, plastic base heat sink material prepared by the present invention has uniform and stable thermal conductivity, environmental corrosion resisting, light aging resisting, and cleaning bears dirty, safe insulation, is easy to processing and cuts, and produces efficient, raw material availability is high, is a kind of desirable LED lamp heat sink material.

Embodiment

The present embodiment heat sink material is made up of following raw material: MCMB 3, solid content are silicon sol 4, polyaniline fiber 6,5% aqueous ethanolic solution 40, water glass 5, crystalline flake graphite 4,600 order aluminium nitride micro mist 22,200 order ptfe micropowder 50, the auxiliary agent 2 of 18%.

Described auxiliary agent is made up of the raw material of following weight part: silane coupling agent kh550 8, potassium methyl silicate 1, titanium acetylacetone (25% isopropanol water solution) 2, nano silicon 4, sodium hydroxide 0.2, water 25, preparation method is: be first dissolved in by sodium hydroxide in appropriate water, be mixed with the solution that pH value is 10.5, add nano silicon subsequently, ultrasonic immersion 50min, powder after alkaline purification is washed to neutral rear dry, and add water and be mixed with colloidal sol, again other leftover materials are mixed with the silicon dioxide gel of preparation subsequently, high-speed stirring dispersion 65min, obtain.

(1) first by MCMB, crystalline flake graphite and silicon sol mixed grinding 30min, subsequently by mixed slurry drying removing moisture, gained micro mist is for subsequent use;

(2) water glass is dropped in aqueous ethanolic solution, be stirred to after it dissolves completely, drop into ptfe micropowder, continue dispersed with stirring 50min, then step (1) gained material and other leftover materials are added, mixed grinding 2.5h, compression moulding after material mixes completely, shaping rear base substrate blowing 18h under 50-60 DEG C of condition, remove moisture completely, gained base substrate fires 40min under 350-380 DEG C of condition, is cooled to room temperature subsequently, to obtain final product.

It is as follows that material obtained by the present embodiment tests according to relevant criterion the performance index obtained:

Tensile strength is: 54.5MPa; Elongation at break: 0.46%; Dielectric strength: 18KV/mm; Thermal conductivity is 4.5W/m.k; Thermal diffusivity is 23.8mm ²/ s; The more single tetrafluoroethylene of thermal linear expansion coefficient reduces 85%; Illumination aging resisting performance grade: 4 grades.

Claims

1. LED light source polytetrafluoroethylene (PTFE) base doped polyaniline heat sink material and preparation method thereof, it is characterized in that, this material is made up of the raw material of following weight part: MCMB 2-3, solid content are silicon sol 3-5, the polyaniline fiber 5-6 of 15-20%, 5% aqueous ethanolic solution 30-40, water glass 3-5, crystalline flake graphite 4-5,400-600 order aluminium nitride micro mist 20-25,200-300 order ptfe micropowder 40-50, auxiliary agent 2-3;

2. a kind of LED light source polytetrafluoroethylene (PTFE) base doped polyaniline heat sink material as claimed in claim 1 and preparation method thereof, its preparation method is: