Heat conducting polyethylene terephthalate with high strength and preparation method thereof

A technology of polyethylene terephthalate and ethylene terephthalate is applied in the field of thermally conductive polyethylene terephthalate and its preparation, and can solve the problem of flame retardant ethylene terephthalate. Ester does not have thermal conductivity, plastic thermal conductivity is not improved, no thermal conductivity and heat dissipation function, etc., to achieve the effect of improving extrusion and injection molding processing performance, improving thermal conductivity, and high strength

Inactive Publication Date: 2010-09-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the addition of phosphazene compound and phenolic resin in parts by weight of 5-90 parts, the resulting product has good flame retardancy, and its flame retardancy reaches UL94V0 level; however, due to the thermal conductivity of the added phosphazene compound and phenolic resin Both are poor, so the thermal conductivity of plastics is not improved, and the resulting flame-retardant ethylene terephthalate does not have thermal conductivity
This material can be used for flame retardant plastic parts in the electrical and electronic industry, but it has no heat conduction and heat dissipation function, thus limiting its further application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] After fully drying the raw materials, by weight parts, 20 parts of polystyrene-polyacrylic acid block copolymers (number-average molecular weight 8400g / mol) and 80 parts of magnesium oxide whiskers (diameter is 0.5 micron, length 100 microns) at 100° C. at a speed of 5000 rpm for 10 minutes under shearing and stirring to prepare a heat conducting agent. Take by weighing 645 grams of polyethylene terephthalate (density 1.30g / dm 3 ), 300 grams of the heat conducting agent, 50 grams of calcium sulfate whiskers (5 microns in diameter, 50 microns in length), 5 grams of 4,4 "-thiobis (6-tert-butyl m-cresol), the above The components were mixed uniformly, and then the obtained mixture was extruded in an extruder at 260° C., drawn, pelletized, and injection molded to make samples.

[0023] Performance Testing:

[0024] The thermal conductivity of the sample is tested according to "ASTM C518 Thermal Conductivity Test Method"; the impact strength of the sample is tested accordi...

Embodiment 2

[0026] After the raw materials are fully dried, by weight parts, 30 parts of polystyrene-polyacrylic acid block copolymers (number average molecular weight 14600g / mol) and 70 parts of magnesium oxide whiskers (diameter is 1 micron, length 200 microns) at 100° C. at a speed of 6000 rpm for 20 minutes under shearing and stirring to prepare a thermally conductive agent. Take by weighing 767 grams of polybutylene terephthalate (density 1.38g / dm 3 ), 200 grams of the above-mentioned heat conducting agent, 30 grams of calcium sulfate whiskers (20 microns in diameter and 80 microns in length), 3 grams of 4,4 "-thiobis (6-tert-butyl m-cresol), and the above group The parts are mixed evenly, and then the resulting mixture is extruded, drawn, pelletized in an extruder at 240°C, and injected into samples for performance testing.

[0027] The thermal conductivity of the sample is tested according to "ASTM C518 Thermal Conductivity Test Method"; the impact strength of the sample is tested...

Embodiment 3

[0029] After the raw material is fully dried, by weight, the magnesium oxide whisker (diameter is 0.75 micron, length is 150 micron) at 100° C. and 5500 rpm for 15 minutes under shearing and stirring to prepare the heat conducting agent. Take by weighing 700 grams of polyethylene terephthalate (density 1.34g / dm 3 ), 256 grams of the above heat conducting agent, 40 calcium sulfate whiskers (15 microns in diameter and 65 microns in length), 4 grams of 4,4 "-thiobis (6-tert-butyl m-cresol), the above components Mix evenly, and then extrude the obtained mixture in an extruder at 250° C., haul it, pelletize it, and inject it into a sample for performance testing.

[0030] The thermal conductivity of the sample is tested according to "ASTM C518 Thermal Conductivity Test Method"; the impact strength of the sample is tested according to "ASTM D256 Plastic Izod Impact Test Method". The thermal conductivity of the obtained sample is 1.4W·(m·K) -1 , impact strength up to 135J / m. The ...

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Abstract

The invention discloses a heat conducting polyethylene terephthalate with high strength and a preparation method thereof, the heat conducting polyethylene terephthalate comprises the following components in parts by weight: 64.5-76.7 parts of polyethylene terephthalate, 20-30 parts of heat conducting agent, 3-5 parts of calcium sulfate whiskers and 0.3-0.5 part of antioxidant; and the preparation method comprises the following steps: uniformly mixing all the component, then carrying out extrusion, traction and granulation at the temperature of 240 DEG C-260 DEG C, and preparing the heat conducting polyethylene terephthalate. Magnesium oxide whiskers and a polystyrene-polyacrylic acid block copolymer form a heat conducting network channel along a molecular chain of matrix resin through the polar interaction with the matrix resin, thereby being capable of effectively improving the heat conductivility of the polyethylene terephthalate; furthermore, the magnesium oxide whiskers can further play the roles of strengthening and toughening; and the good compatibility of the calcium sulfate whiskers with the polar polyethylene terephthalate can endue the materials with high-strength mechanical properties.

Description

technical field [0001] The present invention relates to polyethylene terephthalate, in particular to high-strength heat-conducting polyethylene terephthalate and a preparation method thereof, the high-strength heat-conducting polybutylene terephthalate can be Used as a plastic part with high thermal conductivity. Background technique [0002] Polyethylene terephthalate (PET for short). PET is the lowest price among engineering plastics and has high cost performance. PET macromolecules have tight aggregation ability, high crystallinity and hydrophobic nature. Its advantages are strong toughness, excellent physical and mechanical properties in a wide temperature range, and the long-term use temperature can reach 120°C; it is widely used in housing materials and packaging materials in the fields of electronics, electrical and medical, auto parts, in mechanical equipment. However, the thermal conductivity of PET is about 0.2W·(m·K) -1 . Due to the poor thermal conductivity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08L53/00C08K13/04C08K7/08C09K5/14
Inventor 吴水珠余昌敏曾钫赵建青
Owner SOUTH CHINA UNIV OF TECH
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