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High-thermal-conductivity insulation polyester composite material and preparation method thereof

A technology of polyester material and high thermal conductivity filler, applied in the field of polymer processing, can solve the problems of affecting mechanical properties, poor alkali resistance, reducing thermal conductivity of materials, etc., and achieve the effects of improving mechanical properties, stabilizing molecular weight, and improving melt strength

Inactive Publication Date: 2014-01-15
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Polyester can resist general acid and alkali and most organic solvents at room temperature, but the alkali resistance is poor in molten state, and the metal oxide thermally conductive fillers widely used at present will have certain hydroxyl groups on the surface, which will make The degradation of polyester affects its mechanical properties, and the gas generated during the degradation process remains inside the product, which will also reduce the thermal conductivity of the material

Method used

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  • High-thermal-conductivity insulation polyester composite material and preparation method thereof

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Embodiment 1

[0023] Example 1: 100 parts of PET; 150 parts of BN; 20 parts of alkali-free glass fiber; 5 parts of SBS; 10 parts of GMA-g-SEBS; 2 parts of silane coupling agent A172; This example adopts one-step processing. Mix the BN treated with the coupling agent and the dried raw materials according to the above formula, and then extrude and granulate with twin-screw at 270°C. Then inject at 280°C to obtain the product. Product thermal conductivity 1.42W / m·K (vertical direction), volume resistivity 2.75×10 14 Ω cm, surface resistivity 3.84×10 16 Ω cm, tensile strength: 41MPa; notched impact strength: 7.5KJ / m 2 .

Embodiment 2

[0024] Example 2: 100 parts of PBT; 100 parts of alumina; 20 parts of E-glass fiber; 10 parts of PP; 5 parts of SEBS-GMA; 2 parts of A172; 2 parts of SAG008. This example uses two-step processing. Firstly, the aluminum oxide treated with coupling agent, HDPE and SEBS-GMA are evenly mixed, and then pelletized by twin-screw extrusion at 190°C. Then it is uniformly mixed with other components for secondary granulation. Granulation temperature, injection temperature with embodiment one. Product thermal conductivity 0.9W / m K, volume resistivity 1.34E14Ω cm, surface resistivity 3.21E16Ω / cm 2 , tensile strength: 28MPa; notched impact strength: 5.2KJ / m 2 .

Embodiment 3

[0025] Example 3: Take 100 parts of PBT; 40 parts of BN; 60 parts of alumina; 10 parts of SBS; 5 parts of GMA-g-SEBS; 22 parts of silane coupling agent A1722; This example uses two-step processing. First, BN and alumina are treated with a coupling agent, then mixed with SBS and GMA-g-SEBS evenly, and granulated by twin-screw extrusion at 160°C. Then mix it with other components evenly for secondary granulation. Granulation temperature, injection temperature are with embodiment 2. Product thermal conductivity 1.15W / m K, volume resistivity 4.30×10 14 Ω cm, surface resistivity 5.74×10 16 Ω / cm 2 , tensile strength: 35MPa; notched impact strength: 6.3KJ / m 2 .

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Abstract

The invention relates to a formula and a preparation method of an injection-molded high-thermal-conductivity insulation polyester composite material. The heat conduction coefficient is higher than 0.78W / m.K. The material is composed of the components of, by weight: 100 parts of polyester, 50-200 parts of a high-thermal-conductivity filling material, 50-200 parts of metal oxide, 0-30 parts of alkali-free glass fiber, 0-20 parts of a toughening agent, 0-10 parts of a compatilizer, 0.5-3 parts of a coupling agent, and 1-5 parts of an active multi-functional-group compound. The characteristics of the preparation method are that: metal oxide pre-coating treatment and active multi-functional-group compound adding methods cooperates, such that a polyester degradation problem during a processing process is solved. Also, belt conveying, air-cooling, and hot cutting technologies are adopted, such that the steps are simplified, and time is saved.

Description

1. Technical field [0001] The invention relates to a preparation process and formulation of a heat-conducting and insulating polyester composite material for LED lamps. The material has a thermal conductivity greater than 0.78W / m·K, can be injection molded, and belongs to the field of polymer processing. 2. Background technology [0002] LED lights have the advantages of good environmental performance, long service life, good monochromaticity, fast response, high luminous efficiency, and low energy consumption. They have become the fourth generation of new light sources after incandescent lamps, fluorescent lamps and HID lamps. LED lamps are mainly composed of lampshades, lamp panels, radiators, driving power supplies, interfaces, etc. The main function of the heat sink is to continuously export and dissipate the heat generated during the working process of the LED chip to the environment, so as to keep the temperature of the chip within the required range, so as to ensure t...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08L53/02C08L23/06C08K13/06C08K9/10C08K7/14C08K3/34C08K3/28C08K3/22
Inventor 苑会林严从立
Owner BEIJING UNIV OF CHEM TECH
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