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Method for increasing molecular weight of polyamide/graphite composite material through solid-phase polymerization

A composite material and solid-state polymerization technology, applied in the field of polymer materials, to achieve good mechanical properties

Inactive Publication Date: 2012-09-05
TORAY FIBER RES INST(CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has not been reported in the field of polyamide / graphite composite materials

Method used

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  • Method for increasing molecular weight of polyamide/graphite composite material through solid-phase polymerization
  • Method for increasing molecular weight of polyamide/graphite composite material through solid-phase polymerization
  • Method for increasing molecular weight of polyamide/graphite composite material through solid-phase polymerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The nylon 6 / graphite composite material (viscosity-average molecular weight is 1.79E+04) that granular graphite content is 1.5% is added in the reaction flask of rotary evaporator, under vacuum condition (absolute pressure 1torr), under 160 ℃ of conditions, with Sodium hypophosphite is used as a catalyst, and the addition amount is 1.3*10 -5 mol / g, solid-phase polymerization of the reactant, during the reaction, rotate the reaction bottle at 100rpm to fully react. After a certain period of time (respectively 4 hours, 8 hours, 12 hours, 24 hours), the solid-phase polymerized material was placed in pure water at 50° C. and stirred to recover the polyamide / graphite composite material with increased molecular weight.

[0024] The results obtained are as follows:

[0025]

[0026] It can be seen from the results in the table that after 24 hours, the viscosity-average molecular weight of the composite material can be increased from 1.79E+04 to 2.50E+4, while its tensile s...

Embodiment 2

[0028] The nylon 612 / graphite composite material (viscosity-average molecular weight is 1.95E+04) that granular graphite content is 1.5% is added in the reaction flask of rotary evaporator, under vacuum condition (absolute pressure 1torr), under 160 ℃ of conditions, with Sodium hypophosphite is used as a catalyst, and the addition amount is 1.3*10 -5 mol / g, solid-phase polymerization of the reactant, during the reaction, rotate the reaction bottle at 100rpm to fully react. After a certain period of time (respectively 4 hours, 8 hours, 12 hours, 24 hours), the solid-phase polymerized material was placed in pure water at 40° C. and stirred, and the polyamide / graphite composite material with increased molecular weight was recovered.

[0029] The results obtained are as follows:

[0030]

[0031] It can be seen from the results in the table that after 24 hours, the viscosity-average molecular weight of the composite material can be increased from 1.95E+04 to 2.71E+4, and its t...

Embodiment 3

[0033] The nylon 66 / graphite composite material (viscosity-average molecular weight is 1.55E+04) that granular graphite content is 1% is added in the reaction flask of rotary evaporator, under vacuum condition (absolute pressure 1torr), under 160 ℃ of conditions, with Phosphoric acid is used as a catalyst, the addition amount is 1.0*10 -5 mol / g, solid-phase polymerization of the reactant, during the reaction, rotate the reaction bottle at 100rpm to fully react. After a certain period of time (respectively 4 hours, 8 hours, 12 hours, 24 hours), the solid-phase polymerized material was placed in 60°C pure water and stirred to recover the polyamide / graphite composite material with increased molecular weight.

[0034] The results obtained are as follows:

[0035]

[0036] It can be seen from the results in the table that after 24 hours, the viscosity-average molecular weight of the composite material can be increased from 1.55E+04 to 2.61E+4, and its tensile strength can be in...

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Abstract

The invention discloses a method for increasing molecular weight of a polyamide / graphite composite material through solid-phase polymerization, which is characterized by comprising the following steps: adding the granular or powdered polyamide / graphite composite material into a reactor; in an oxygen-free atmosphere or under vacuum, and in the presence of a phosphorous catalyst, performing the solid-phase polymerization reaction on the polyamide / graphite composite material, and continuously stirring the material in the reactor or continuously rotating the reactor in the reaction process; and performing catalyst removing post-treatment on the polyamide / graphite composite material with the increased molecular weight. By using the solid-phase polymerization method, the molecular weight of thepolyamide / graphite composite material can be effectively increased, so that the thermodynamic property of the material is improved.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a method for increasing the molecular weight of a polyamide / graphite composite material through solid phase polymerization. Background technique [0002] Polyamide is a thermoplastic engineering plastic with excellent performance and wide application. However, due to its conductivity at 10 -15 Below S / cm, the antistatic performance of the product is poor, which limits its application range. The improvement of electrical conductivity is usually achieved by adding a certain amount of conductive material, which is connected by conductive filler to form a conductive path, so that the polymer material has a certain degree of electrical conductivity. In the prior art, graphite-based conductive fillers are mostly natural graphite, expanded graphite, etc., affected by the size and agglomeration of fillers, a high amount of fillers is required in the system to form a conduct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L77/00C08K3/04C08G69/06
Inventor 赵超越杜宁陈桥吴刚
Owner TORAY FIBER RES INST(CHINA) CO LTD
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