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Heat-conducting polyformaldehyde composite material and preparation method thereof

A composite material, polyoxymethylene technology, applied in the field of polymer material processing, can solve the problems of difficult composite and functionalization, poor compatibility, etc.

Active Publication Date: 2014-07-02
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there are many patent technologies related to the preparation of polymer-based thermally conductive composite materials by using thermally conductive fillers, such as Chinese patents CN101250294A, CN101555347A, CN101275014A, CN101717579A, CN101845204A, etc., but most of the thermally conductive plastics produced by such patents are made of PE, PA, PC, PET, PPS, etc. are matrix resins, and for POM, due to its regular molecular chain, non-polarity, high crystallinity, and poor compatibility with other resins or fillers, it is difficult to compound and functionalize it. Performance of thermally conductive POM composites related literature reports

Method used

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  • Heat-conducting polyformaldehyde composite material and preparation method thereof
  • Heat-conducting polyformaldehyde composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Disperse 150g of polyetheramine surface treatment agent (n=5, m=18) and 3Kg of carboxylated multi-walled carbon nanotubes in a mixed solution of ethanol and water with a volume ratio of 1:9, with a mass fraction of 5%, at 50°C Ultrasonic treatment for 0.5h (frequency: 20kHz, power: 400w), then suction filtration and drying to obtain surface-modified multi-walled carbon nanotubes for use.

[0024] Mix polyoxymethylene resin 10Kg with surface-modified multi-walled carbon nanotubes 2Kg, tetrakis-[3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol 30g, melamine 20g, carbonic acid Add 20 g of calcium into a high-speed mixer for mixing, melt and knead with a vented twin-screw extruder, and extrude to granulate. Screw speed, 50 rpm; barrel temperature, 140-200°C.

[0025] The prepared thermally conductive POM / multi-armed carbon nanotube composite material has a thermal conductivity of 1.05W / (m K), a tensile strength of 58MPa, and a notched impact strength of 5....

Embodiment 2

[0027] Disperse 90g of polyetheramine surface treatment agent (n=10, m=12) and 3Kg of graphite oxide in a mixed solution of ethanol and water with a volume ratio of 1:9, with a mass concentration of 5%, and ultrasonically treat it at 50°C for 1h ( frequency: 20kHz, power: 400w), and then suction filtered and dried to obtain surface-modified graphite oxide for use.

[0028] POM resin 10Kg and surface modified graphite oxide 3Kg, N,N'-bis-[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hexamethylenediamine 40g, dicyandiamide Add 10 g of amine and 10 g of magnesium oxide into a high-speed mixer for mixing, use a vented twin-screw extruder to melt and knead, and extrude to granulate. Screw speed, 100 rpm; barrel temperature, 160-220°C.

[0029] The thermally conductive POM / graphite oxide composite material prepared has a thermal conductivity of 1.21W / (m K), a tensile strength of 53MPa, and a notched impact strength of 5.4KJ / m 2 .

Embodiment 3

[0031] Disperse 60g of polyetheramine surface treatment agent (n=10, m=12) and 3Kg of hydroxylated multi-walled carbon nanotubes in a mixed solution of ethanol and water with a volume ratio of 1:9, with a mass concentration of 5%, at 50°C Under ultrasonic treatment for 1.5h (frequency: 20kHz, power: 400w), then suction filtration and drying to obtain surface-modified hydroxylated multi-walled carbon nanotubes for use.

[0032] 10Kg of POM resin, 2Kg of hydroxylated multi-walled carbon nanotubes after surface modification, 10g of stearyl propionate, 70g of urea, and silicic acid Add 7g of calcium into a high-speed mixer for mixing, use a vented twin-screw extruder to melt and knead, and extrude to granulate. Screw speed, 200 rpm; barrel temperature, 180-220°C.

[0033] The prepared thermally conductive POM / hydroxylated carbon nanotube composite material has a thermal conductivity of 1.15W / (m K), a tensile strength of 60MPa, and a notched impact strength of 5.0KJ / m 2 .

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Abstract

The invention discloses a heat-conducting polyformaldehyde composite material and a preparation method thereof. The method is characterized by comprising the following steps: mixing 100 parts of POM resin, 0.1-0.3 parts of antioxidant, 0.05-2 parts of formaldehyde absorbent, 0.05-0.5 parts of formic acid absorber and 5-40 parts of carbon filler modified with a polyether amine surface treatment agent in a high-speed mixer; fusing and mixing by adopting an exhaust type twin-screw extruder; extruding and pelleting so as to obtain the heat-conducting polyformaldehyde composite material, wherein the screw rotation speed is 50-200r / min, and the barrel temperature is 140-220 DEG C.

Description

1. Technical field [0001] The invention relates to a method for preparing thermally conductive thermoplastic engineering plastics, belonging to the field of polymer material processing. 2. Background technology [0002] Polyoxymethylene (POM) is based on [-CH 2 -O-] main chain, unbranched, high melting point, high density, high crystalline thermoplastic engineering plastics, with high strength and rigidity, excellent creep resistance, fatigue resistance, inherent lubricity, wear resistance It is the closest to metal in engineering plastics, and can be used to replace copper, aluminum, zinc and other non-ferrous metals and alloy products. It is widely used in electronics, automobiles, light industry, machinery, chemicals, building materials, etc. field. [0003] Like other polymer materials, POM itself is a heat-insulating material, a poor conductor of heat, and has poor thermal conductivity. Its thermal conductivity at room temperature is only 0.4W / m·K, which limits its ap...

Claims

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Application Information

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IPC IPC(8): C08L59/00C08K9/04C08K7/00C08K3/04C08K5/134C08K5/3492C08K3/26
Inventor 赵晓文叶林
Owner SICHUAN UNIV
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