Boron nitride oriented thermal-conductive nylon and preparation method thereof

A technology of boron nitride and nylon, which is applied in the field of boron nitride-oriented thermally conductive nylon and its preparation, can solve the problems of complex process, low efficiency, and difficulty in industrialization, and achieve the goal of simplifying the processing technology, improving processability, and facilitating industrialization Effect

Inactive Publication Date: 2019-06-07
ANHUI JIHONG MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In summary, in order to improve the thermal conductivity of boron nitride / polymer composites, it is a feasible solution to make boron nitride particles form a well-oriented structure in the matrix, but the current boron nitride method for forming an oriented structure is inefficient , or the method is complicated and difficult to realize industrialization

Method used

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  • Boron nitride oriented thermal-conductive nylon and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step 1, mixing boron nitride particles and urea particles and adding them to a ball mill for ball milling, washing with deionized water for 3 times and drying after ball milling; the mass ratio of boron nitride particles to urea particles is 1:1 ; The mass ratio of the used balls and boron nitride particles for ball milling is 50:1, the ball milling speed is 100rpm, and the ball milling time is 8h;

[0027] Step 2, adding the boron nitride particles treated in step 1 to the N,N-dimethylformamide (DMF) solution of hyperbranched polyester (BE) with terminal hydroxyl groups for grafting reaction, and finally washing with acetone and dry to obtain grafted modified boron nitride; the grafting reaction temperature is 70°C, the grafting reaction stirring time is 2h, and the N,N-dimethylformaldehyde of the hyperbranched polyester (BE) with terminal hydroxyl groups Amide (DMF) solution concentration is 1.0mol / L;

[0028] Step 3, 50 parts by weight of the graft modified boron ni...

Embodiment 2

[0030] Step 1, mixing boron nitride particles and urea particles and adding them to a ball mill for ball milling, washing with deionized water for 3 times and drying after ball milling; the mass ratio of boron nitride particles to urea particles is 1:5 ; The mass ratio of the balls used for ball milling to boron nitride particles is 50:1, the ball milling speed is 100rpm, and the ball milling time is 3h;

[0031] Step 2, adding the boron nitride particles treated in step 1 to the N,N-dimethylformamide (DMF) solution of hyperbranched polyester (BE) with terminal hydroxyl groups for grafting reaction, and finally washing with acetone and dry to obtain grafted modified boron nitride; the grafting reaction temperature is 70°C, the grafting reaction stirring time is 2h, and the N,N-dimethylformaldehyde of the hyperbranched polyester (BE) with terminal hydroxyl groups Amide (DMF) solution concentration is 1.0mol / L;

[0032] Step 3, 20 parts by weight of the graft modified boron nit...

Embodiment 3

[0034] Step 1, mixing boron nitride particles and urea particles and adding them to a ball mill for ball milling, washing with deionized water for 3 times and drying after ball milling; the mass ratio of boron nitride particles to urea particles is 1:3 ; The mass ratio of the used balls and boron nitride particles for ball milling is 50:1, the ball milling speed is 100rpm, and the ball milling time is 5h;

[0035] Step 2, adding the boron nitride particles treated in step 1 to the N,N-dimethylformamide (DMF) solution of hyperbranched polyester (BE) with terminal hydroxyl groups for grafting reaction, and finally washing with acetone and dry to obtain grafted modified boron nitride; the grafting reaction temperature is 65°C, the grafting reaction stirring time is 2.5h, and the N,N-dimethyl of the hyperbranched polyester (BE) with terminal hydroxyl groups Formamide (DMF) solution concentration is 0.8mol / L;

[0036] Step 3, 30 parts by weight of the graft modified boron nitride,...

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Abstract

The invention relates to boron nitride oriented thermal-conductive nylon and a preparation method thereof. The preparation method comprises the following steps: mixing boron nitride particles and ureaparticles, adding the mixed material into a ball mill, performing ball milling, after ball milling is completed, performing washing by using deionized water, and performing drying, wherein a mass ratio of the boron nitride particles to the urea particles is 1:(1-5); adding the boron nitride particles treated in the step 1 into a N,N-dimethylformamide solution of a hyperbranched polyester having terminal hydroxyl, performing a grafting reaction, performing washing by using acetone, and performing drying to obtain graft modified boron nitride, wherein the temperature of the grafting reaction is65-75 DEG C, and the stirring time is 1.5-2.5 h; and performing mixing on 20-50 parts by weight of the graft modified boron nitride, 100 parts by weight of nylon, 0.2-1 part by weight of an antioxidant and 0.1-1 part by weight of a lubricant, and performing extrusion. According to the thermal-conductive nylon and preparation method provided by the invention, the boron nitride is induced to form an oriented thermal-conductive pathway while the processing viscosity of the system is reduced, the processing technology is simplified, and industrialization is facilitated.

Description

technical field [0001] The invention belongs to the field of polymer thermally conductive modified materials, and in particular relates to a boron nitride oriented thermally conductive nylon and a preparation method thereof. Background technique [0002] Nylon is a general-purpose engineering plastic with excellent performance, which is widely used in the automotive field. But the low thermal conductivity of nylon limits its further use. The current way to improve the thermal conductivity of nylon is to add high thermal conductivity fillers, such as graphene, carbon nanotubes, metal particles, boron nitride, etc. Among these fillers, except for boron nitride, the other fillers are conductive fillers, and it is difficult to achieve insulation while conducting heat. Boron nitride itself is an insulating filler, so it is of great significance in the field of insulating and heat-conducting polymers. [0003] Chinese invention patent CN201310671420.8 discloses a high thermal c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/02C08L77/06C08L77/00C08K9/04C08K3/38C08K5/134C08K5/526
Inventor 陈海袁婷何修文
Owner ANHUI JIHONG MATERIAL TECH
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