Thermally conductive and insulating polycarbonate composition and preparation method thereof

A polycarbonate, thermally conductive and insulating technology, applied in the field of polycarbonate compositions and their preparation, can solve problems such as loss of mechanical properties, and achieve the effects of increasing thermal conductivity, reducing dosage, and improving mechanical properties

Inactive Publication Date: 2009-10-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention focuses on solving the problem of large loss of mechanical properties of inorganic thermal conductivity additives such as alumina in the process of modifying the the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take 300g of Al with an average particle size of 5 μm and a thermal conductivity of 42W / m.K 2 o 3 , add 10g of vinyltrimethoxysilane coupling agent diluted with 2 times ethanol, and stir in a high-speed mixer for 30min for surface treatment. With 150g linear low density polyethylene (LLDPE, brand 7144), 307g above-mentioned surface-treated Al 2 o 3 1.5g of antioxidant B215 is dispersed and mixed by a high-speed mixer, and then melted and extruded by a twin-screw extruder in the range of 170-180°C to obtain a heat-conducting masterbatch, wherein the feeding section is 170°C, the melting section is 180°C, and the homogenization section 180°C; then disperse and mix the thermally conductive masterbatch, 500g polycarbonate (viscosity average molecular weight: 10000), 40g linear low density polyethylene grafted maleic anhydride and 1.5g antioxidant B215 through a high-speed mixer, and pass through a twin-screw Machine melt extrusion, drying, pelletizing and packaging. The...

Embodiment 2

[0033] Take 500g of MgO with an average particle size of 4μm and a thermal conductivity of 48W / m.K, add 15g of γ-glycidoxypropyltrimethoxysilane diluted 3 times with ethanol, and stir in a high-speed mixer for 30min for surface treatment. After dispersing and mixing 164g polypropylene (grade 425), 512g surface-treated MgO, and 2g antioxidant B225 through a high-speed mixer, knead at 180-190°C through a double-roller kneader to obtain a thermally conductive masterbatch; Thermally conductive masterbatch, 250g polycarbonate (viscosity average molecular weight: 20,000), 70g MBS and 2g antioxidant B225 are dispersed and mixed by a high-speed mixer, melt-extruded by a twin-screw machine, dried, pelletized, and packaged. The temperature of each zone of the used twin-screw extruder screw is 245-270°C, wherein the feeding section is 245°C, the melting section is 260°C, and the homogenizing section is 270°C.

Embodiment 3

[0035]Take 400g of SiC with an average particle size of 2μm and a thermal conductivity of 180W / m.K, add 15g of titanate coupling agent isopropyl triisostearyl titanate (OL-T999) diluted 4 times with ethanol, and put it in a high-speed mixer Stir for 25min for surface treatment. After dispersing and mixing 200g of ethylene-octene copolymer (brand 8400), 415g of surface-treated SiC, and 2.5g of antioxidant 626 in a high-speed mixer, they were kneaded at 180-190°C by a double-roller kneader to obtain thermal conductivity Masterbatch; then heat-conducting masterbatch, 330g polycarbonate (viscosity-average molecular weight is 40000), 50g SMA and 2.5g antioxidant 626 are dispersed and mixed through a high-speed mixer, melted and extruded by a twin-screw extruder, dried, Packed after dicing. The temperature of each zone of the used twin-screw extruder screw is 245-270°C, wherein the feeding section is 245°C, the melting section is 260°C, and the homogenizing section is 270°C.

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Abstract

The invention discloses a thermally conductive and insulating polycarbonate composition and a preparation method thereof. Based on part by mass, the composition comprises the following components: 25-50 parts of polycarbonate, 15-25 parts of polyolefine and copolymers thereof, 30-50 parts of thermally conductive and insulating auxiliary agents, 4-7 parts of compatilizer, 1.0-1.5 parts of coupling agents and 0.3-0.5 part of other auxiliary agents. The preparation is divided into two steps: step 1. the polyolefine and copolymers thereof, thermally conductive and insulating auxiliary agents and other auxiliary agents are melted and extruded by a double-screw extruder or mixed by a two roll mixer to prepare thermally conductive master batches; step 2. the thermally conductive master batches, polycarbonate, compatilizer and other auxiliary agents are melted and extruded by the double-screw extruder and are dried after pelleting. The composition obtained by the invention has excellent thermal conductivity, insulativity, mechanical property and processing property; when the coefficient of thermal conductivity is 0.8-1.2W/m.K, the impact strength is kept above 250J/m, therefore, the composition is in line with the use requirement.

Description

technical field [0001] The invention relates to a polycarbonate resin composition and a preparation method, in particular to providing a polycarbonate composition with excellent thermal conductivity, insulation, mechanical properties and processability and a preparation method thereof. Background technique [0002] Polycarbonate resin (PC) is a thermoplastic engineering plastic with excellent performance. It has outstanding impact resistance, creep resistance and dimensional stability, and is heat-resistant, low water absorption, non-toxic, and excellent insulation performance. The only product with good transparency among plastics, it is widely used in automotive, electrical and electronic, construction, office equipment, packaging, sports equipment, medical care and other fields. With its application in various electronic / electrical instrument panels, shells of desktop computers, laptop computers, video recorders, color TV sets, copiers, etc. More and more widely, in view...

Claims

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Application Information

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IPC IPC(8): C08L69/00C08K13/02B29B9/00B29B7/72B29C47/92B29C48/40B29C48/92
CPCB29C48/92B29C2948/92704B29C48/04B29C48/40B29C48/9185B29C2948/92895
Inventor 赵建青文雯刘述梅张杨
Owner SOUTH CHINA UNIV OF TECH
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