CN105542462A - Nanometer-lanthanum-oxide-modified mica-powder-enhanced polyphenylene-sulfide-based high-strength heat dissipation material for LED and preparation method of heat dissipation material - Google Patents

Abstract

The invention discloses a nanometer-lanthanum-oxide-modified mica-powder-enhanced polyphenylene-sulfide-based high-strength heat dissipation material for an LED. According to the composite material, a nano mica sheet generated after high-temperature modification with nanometer lanthanum oxide serves as toughening and reinforcing filler, the surface of the nano mica sheet is doped and mixed with stearic acid, the modified filler and polyphenylene sulfide have good compatibility, the agglomeration phenomenon among particles is lowered, thermal stability is better, uniform dispersing and combination with a molecular material in the melting process is achieved, adhesive force is high, the machining property and mechanical property of the polyphenylene sulfide are effectively improved, and the added thermal conductivity filler is of a flake-shaped structure and a fiber-shaped structure and can be fully combined with modified polyphenylene sulfide masterbatch to form a stable heat conductivity structure, so that the composite material which is better in both mechanical property and thermal conductivity property is prepared, the strength of the composite material is greatly improved, and the nanometer-lanthanum-oxide-modified mica-powder-enhanced polyphenylene-sulfide-based high-strength heat dissipation material has wide application space on the aspect of LED packaging.

Description

The modified micaceous powder of a kind of LED nano lanthanum oxide strengthens polyphenylene sulfide ether high strength heat sink material and preparation method thereof

Technical field

The present invention relates to heat-conducting plastic preparing technical field, particularly relate to the modified micaceous powder of a kind of LED nano lanthanum oxide and strengthen polyphenylene sulfide ether high strength heat sink material 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.

Polyphenylene sulfide is a kind of crystallinity, thermoplastic special engineering plastic, its over-all properties is superior, there is excellent thermotolerance, insulativity, erosion resistance, good stability of the dimension etc. advantage, its encapsulating plastics as LED lamp are particularly suitable, improving its thermal conductivity is a vital link, the method of common raising polyphenylene sulfide plastic thermal conductivity is blending high conduction powder in the plastic, but ubiquity plastic substrate intensity reduces in actual applications, mechanical property weakens, problem that heat-conducting effect is not good etc., application is restricted, along with the development on a large scale of high-power LED lamp, industry is badly in need of improving existing technique, to obtain the matrix material with the heat-conducting effect of efficient stable.

Summary of the invention

The object of the invention is exactly the defect in order to make up prior art, provides the modified micaceous powder of a kind of LED nano lanthanum oxide to strengthen polyphenylene sulfide ether high strength heat sink material and preparation method thereof.

The present invention is achieved by the following technical solutions:

The modified micaceous powder of a kind of LED nano lanthanum oxide strengthens polyphenylene sulfide ether high strength heat sink material, and this composite plastic is made up of the raw material of following weight part: graphene nanometer sheet 2-3, zinc borate 0.2-0.3, carbon nano fiber 4-5, nano lanthanum oxide 0.1-0.2, nano mica sheet 4-5, methyl benzotriazazole 0.1-0.2, polyphenylene sulfide 50-60, silane coupling agent 0.4-0.5, calcium zinc stabilizer 1-2, stearic acid 0.5-0.6, dehydrated alcohol 8-10, deionized water are appropriate.

The modified micaceous powder of described a kind of LED nano lanthanum oxide strengthens polyphenylene sulfide ether high strength heat sink material and preparation method thereof, and described preparation method is:

(1) first by nano lanthanum oxide, nano mica sheet, deionized water drops in high-energy mills, abundant ground and mixed 40-50min, by fully dry for mixture removing moisture after grinding terminates, subsequently gained composite granule is heated to 750-800 DEG C with the temperature rise rate of 15-20 DEG C under nitrogen atmosphere, insulation calcining 1-1.5h, room temperature is naturally cooled to after calcining terminates, obtain nano lanthanum oxide modified Nano sheet mica composite granule, last again by this powder and stearic acid, dehydrated alcohol mixes, heating in water bath is to 70-80 DEG C, after high-speed mixing stirs 1.5-2h, complete drying removes ethanol, the grinding of gained crushing material is for subsequent use,

(2) drop in high-speed mixer together with the material prepared by polyphenylene sulfide and step (1), be uniformly mixed melt blending granulation in rear input twin screw extruder, obtain modified polyphenyl thioether master batch for subsequent use;

(3) graphene nanometer sheet, carbon nano fiber and dropping in high-speed mixer together with modified polyphenyl thioether master batch and other remaining component after silane coupling agent mixing and stirring is uniformly mixed, again drop in twin screw extruder and extrude pelletizing, obtain described matrix material.

Advantage of the present invention is: the present invention is using nano mica sheet after nano lanthanum oxide is high temperature modified as toughened and reinforced filler, and at its surperficial blending stearic acid, modified filler and polyphenylene sulfide have good consistency, interparticle agglomeration is reduced, thermostability is better, the dispersed combination with macromolecular material in melting, strong adhesion, effectively improve processing characteristics and the mechanical property of polyphenylene sulfide, the heat conductive filler added possesses sheet and filamentary structure, fully can be combined with modified polyphenyl thioether master batch, form stable heat conduction network, thus prepare mechanical property and all good matrix material of heat conductivility, and the intensity maximum of matrix material improves, it has wide application space in LED.

Embodiment

The matrix material of this embodiment is made up of the raw material of following weight part: graphene nanometer sheet 2, zinc borate 0.2, carbon nano fiber 4, nano lanthanum oxide 0.1, nano mica sheet 4, methyl benzotriazazole 0.1, polyphenylene sulfide 50, silane coupling agent 0.4, calcium zinc stabilizer 1, stearic acid 0.5, dehydrated alcohol 8, deionized water are appropriate.

The preparation method of this matrix material is:

(1) first by nano lanthanum oxide, nano mica sheet, deionized water drops in high-energy mills, abundant ground and mixed 40min, by fully dry for mixture removing moisture after grinding terminates, subsequently gained composite granule is heated to 750 DEG C with the temperature rise rate of 15 DEG C under nitrogen atmosphere, insulation calcining 1h, room temperature is naturally cooled to after calcining terminates, obtain nano lanthanum oxide modified Nano sheet mica composite granule, last again by this powder and stearic acid, dehydrated alcohol mixes, heating in water bath to 70 DEG C, after high-speed mixing stirs 1.5h, complete drying removes ethanol, the grinding of gained crushing material is for subsequent use,

(2) drop in high-speed mixer together with the material prepared by polyphenylene sulfide and step (1), be uniformly mixed melt blending granulation in rear input twin screw extruder, obtain modified polyphenyl thioether master batch for subsequent use;

(3) graphene nanometer sheet, carbon nano fiber and dropping in high-speed mixer together with modified polyphenyl thioether master batch and other remaining component after silane coupling agent mixing and stirring is uniformly mixed, again drop in twin screw extruder and extrude pelletizing, obtain described matrix material.

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

Project	Index
		Tensile strength (MPa)	198
Flexural strength (MPa)	446
		Thermal conductivity (w/mk)	10.5
Flame retardant rating	UL94-V0
		Volume specific resistance (Ω .cm)	＞10 13

Claims (2)

1. the modified micaceous powder of LED nano lanthanum oxide strengthens polyphenylene sulfide ether high strength heat sink material, it is characterized in that, this composite plastic is made up of the raw material of following weight part: graphene nanometer sheet 2-3, zinc borate 0.2-0.3, carbon nano fiber 4-5, nano lanthanum oxide 0.1-0.2, nano mica sheet 4-5, methyl benzotriazazole 0.1-0.2, polyphenylene sulfide 50-60, silane coupling agent 0.4-0.5, calcium zinc stabilizer 1-2, stearic acid 0.5-0.6, dehydrated alcohol 8-10, deionized water are appropriate.

2. the modified micaceous powder of a kind of LED nano lanthanum oxide as claimed in claim 1 strengthens polyphenylene sulfide ether high strength heat sink material and preparation method thereof, and it is characterized in that, described preparation method is:

(1) first by nano lanthanum oxide, nano mica sheet, deionized water drops in high-energy mills, abundant ground and mixed 40-50min, by fully dry for mixture removing moisture after grinding terminates, subsequently gained composite granule is heated to 750-800 DEG C with the temperature rise rate of 15-20 DEG C under nitrogen atmosphere, insulation calcining 1-1.5h, room temperature is naturally cooled to after calcining terminates, obtain nano lanthanum oxide modified Nano sheet mica composite granule, last again by this powder and stearic acid, dehydrated alcohol mixes, heating in water bath is to 70-80 DEG C, after high-speed mixing stirs 1.5-2h, complete drying removes ethanol, the grinding of gained crushing material is for subsequent use,

(2) drop in high-speed mixer together with the material prepared by polyphenylene sulfide and step (1), be uniformly mixed melt blending granulation in rear input twin screw extruder, obtain modified polyphenyl thioether master batch for subsequent use;

(3) graphene nanometer sheet, carbon nano fiber and dropping in high-speed mixer together with modified polyphenyl thioether master batch and other remaining component after silane coupling agent mixing and stirring is uniformly mixed, again drop in twin screw extruder and extrude pelletizing, obtain described matrix material.