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Nylon/graphite thermal conductive plastic and preparation method and usage thereof

A heat-conducting graphite and nylon technology, which is applied in the field of polymer material preparation, can solve problems such as unsatisfactory effects, difficulty in improving the thermal conductivity of heat-conducting plastics, and increasing the economic cost of industrial production.

Active Publication Date: 2014-04-09
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The amount of graphite filling usually can only reach 30 parts by weight. Higher graphite filling amount will lead to uneven dispersion of graphite, and it is difficult to improve the thermal conductivity of the prepared heat-conducting plastic.
It is very difficult to directly melt blend nylon with graphite with high loading (such as higher than 50 parts by weight of graphite / 100 parts by weight of lactam monomer)
Although some special instruments (such as screw extruders with special structures) are used, the effect is still unsatisfactory
In addition, the use of a special screw extruder is complicated to operate and very expensive, which will inevitably increase the economic cost of industrial production

Method used

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  • Nylon/graphite thermal conductive plastic and preparation method and usage thereof

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Effect test

preparation example Construction

[0081] The preparation method provided by the invention is prepared by ring-opening polymerization of graphite and cyclic lactam monomer, comprising the following steps:

[0082] (i) providing a mixture comprising a mixture of graphite powder and optional thermally conductive auxiliary filler;

[0083] Preferably, the graphite has a diameter of 5-50 μm.

[0084] Preferably, the thermally conductive auxiliary filler is selected from the group consisting of carbon fiber, carbon black, carbon nanotubes, Ni powder, Sn powder, Cu powder, Al powder, MgO powder, BeO powder, silicon carbide (SiC) powder, aluminum nitride (AlN) powder, or a combination thereof.

[0085] Preferably, the mixture in the step (i) also contains non-thermally conductive auxiliary fillers.

[0086] (ii) In the reaction system, in the presence of the mixture of step (i), the lactam monomer is subjected to a ring-opening polymerization reaction to form nylon / graphite thermally conductive plastics, wherein, re...

Embodiment

[0107] Methods and Instruments

[0108] Thermal conductivity: According to the ASTM E1461 standard, the laser thermal conductivity meter LFA447 is used to test.

[0109] Density: According to GB / T 1033, it is tested with hydrometer MH-300A.

[0110] Water absorption: tested according to GB / T 1034 standard.

[0111] Twin-screw extruder (AK36 Nanjing Keya Chemical Complete Equipment Co., Ltd.)

Embodiment 1

[0115] Example 1: Thermally Conductive Plastic 2

[0116] (i) After 50 parts by weight of graphite and 10 parts by weight of carbon fiber are mixed uniformly, a high thermal conductivity reinforcing material is obtained through dehumidification and drying treatment, which is ready for use;

[0117] (ii) 100 parts by weight of caprolactam, 3.5 parts by weight of sodium caprolactam and 9.9 parts by weight of hexamethylene-1,6-bisformyl caprolactam are dehumidified and dried for use;

[0118] Add caprolactam into a reaction kettle with nitrogen protection, heat to 90°C, add initiator (see Table 1) and high thermal conductivity reinforcing material after it is completely melted, and stir well; then add activator (see Table 1), fully Stir evenly and heat up to 180° C., react for 60 minutes and discharge to obtain heat-conducting plastic 2 (material).

[0119] The heat-conducting plastic 2 can be used directly, or can be further processed into pellets with a conventional screw extr...

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Abstract

The invention relates to nylon / graphite thermal conductive plastic and a preparation method and usage thereof, and particularly discloses a method for preparing the nylon / graphite thermal conductive plastic by lactam ring-opening polymerization. The method enables graphite and other high thermal conductive fillers to be evenly dispersed in a lactam polymerization system with high quantity to obtain high thermal conductive plastic. The plastic not only improves thermal conductivity remarkably, but also keeps the excellent comprehensive performance of materials. The method solves the problem that high-quantity graphite is difficult to fill, uneven to disperse and the like in an existing preparation method and is convenient to produce. The nylon / graphite thermal conductive plastic manufactured by the method is stable in quality, low in cost and good in performance, and has wide industrial application prospects.

Description

technical field [0001] The invention belongs to a preparation method of a polymer material, in particular to a preparation method of a nylon / graphite thermally conductive plastic. Background technique [0002] With the development of thinner, lighter and multifunctional electronic and electrical equipment, more requirements are put forward for the function and performance of the heat sink. Due to their (1) heat transfer properties of metals and ceramics; (2) the advantages of ordinary plastics in terms of design, performance and cost, heat-conducting plastics are increasingly valued by the market in the preparation of heat-dissipating materials. Thermally conductive plastics are compounded by adding high thermal conductivity reinforcing materials to engineering plastics or general-purpose plastics. [0003] Nylon is a common engineering plastic, widely used in electrical and electronic, household appliances, electromechanical industry, automotive appliances and other fields...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/16C08L77/02C08K3/04C09K5/14
Inventor 祝颖丹杨恒颜春张笑晴李建广张希平范欣愉
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI