High-thermal-conductivity flame-retardant polyolefin-based composite material and preparation method thereof

An olefin-based composite material and a composite material technology are applied in the field of high thermal conductivity flame-retardant polyolefin-based composite materials and their preparation, which can solve the problem of not significantly improving the interface interaction between filler and filler, filler and matrix, difficult to obtain comprehensive performance, The problem of poor compatibility between filler and matrix can achieve the effect of surface hydrophobic modification, strong force, and promotion of interaction.

Active Publication Date: 2021-01-15
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although boron nitride and graphene are used as reinforcing fillers in the above methods, the fillers are essentially added to the matrix only by simple mixing, which does not significantly improve the interfacial interaction between the filler and the filler, or between the filler and the matrix. , does not solve the problem of easy agglomeration of fillers and poor compatibility between fillers and the matrix in practical applications, so it is difficult to obtain ideal comprehensive properties

Method used

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  • High-thermal-conductivity flame-retardant polyolefin-based composite material and preparation method thereof
  • High-thermal-conductivity flame-retardant polyolefin-based composite material and preparation method thereof
  • High-thermal-conductivity flame-retardant polyolefin-based composite material and preparation method thereof

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Embodiment 1

[0049] This embodiment relates to a method for preparing a high thermal conductivity and flame-retardant polyolefin-based composite material, which specifically includes the following steps:

[0050] 1. Treat 100 parts by weight of boron nitride and 50 parts by weight of concentrated sulfuric acid through a hydrothermal method at 100°C for 5 hours, filter and wash to obtain a surface-functionalized boron nitride product, the reagent can be reused, and then in toluene solvent at 90°C Reflux treatment with 10 parts by weight of isopropyl dioleic acid acyloxy (dioctyl phosphate acyloxy) titanate for 0.5 h to obtain pretreated boron nitride.

[0051] 2. Pretreated boron nitride with a concentration of 5 mg / ml and 0.1 parts by weight of graphene oxide with a concentration of 5 mg / ml are stirred to obtain an aqueous dispersion of self-assembled boron nitride coated with graphene oxide , the intermediate.

[0052] 3. Mix the prepared intermediate with 0.05 parts by weight of dodecyl...

Embodiment 2

[0056] This embodiment relates to a method for preparing a high thermal conductivity and flame-retardant polyolefin-based composite material, which specifically includes the following steps:

[0057] 1. Treat 100 parts by weight of boron nitride and 200 parts by weight of concentrated hydrochloric acid by hydrothermal method at 120°C for 5 hours, filter and wash to obtain surface-functionalized boron nitride, the reagent can be reused, and then mix it with toluene solvent at 90°C 10 parts by weight of isopropyl triisostearate titanate were refluxed for 2 hours to obtain pretreated boron nitride.

[0058] 2. The pretreated boron nitride aqueous dispersion with a concentration of 10 mg / ml and 2 parts by weight of a graphene oxide aqueous dispersion with a concentration of 2 mg / ml are stirred to obtain self-assembled nitrogen coated with graphene oxide. The aqueous dispersion of boron chloride, that is, the intermediate.

[0059] 3. Mix the prepared intermediate with 4 parts by ...

Embodiment 3

[0063] This embodiment relates to a method for preparing a high thermal conductivity and flame-retardant polyolefin-based composite material, which specifically includes the following steps:

[0064] 1. Treat 100 parts by weight of boron nitride and 100 parts by weight of concentrated nitric acid by hydrothermal method at 150 ° C for 10 h, filter and wash to obtain surface functionalized boron nitride, the reagent can be reused, and then mix it with toluene solvent at 100 ° C 5 parts by weight of γ-glycidyl etheroxypropyltrimethoxysilane were refluxed for 5 hours to obtain pretreated boron nitride.

[0065] 2. The pretreated boron nitride aqueous dispersion with a concentration of 20 mg / ml and 5 parts by weight of a graphene oxide aqueous dispersion with a concentration of 6 mg / ml are stirred to obtain self-assembled nitrogen coated with graphene oxide. The aqueous dispersion of boron chloride, that is, the intermediate.

[0066] 3. Mix the prepared intermediate with 3 parts ...

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Abstract

The invention discloses a high-thermal-conductivity flame-retardant polyolefin-based composite material and a preparation method thereof. The preparation method comprises the following steps: treatinggraphene oxide and boron nitride, and performing combining to form an intermediate; adding a modifier into the intermediate to obtain a modified filler; and compounding the modified filler with polyolefin to form a network structure, synchronously performing in-situ reduction in the process to obtain a powdery composite material, and then performing melting and hot pressing to obtain the high-thermal-conductivity flame-retardant polyolefin-based composite material. The high-thermal-conductivity flame-retardant polyolefin-based composite material prepared by the invention has the advantages that the thermal conductivity can reach 58W/(m.K), the flame-retardant property reaches V0 level, the thermal expansion coefficient is low, the mechanical strength is good, the composite material can bewidely applied to the fields of thermal conductivity and heat dissipation of electronic equipment, and the method is high in preparation efficiency, low in cost and easy for large-scale industrial preparation.

Description

technical field [0001] The invention relates to the field of multifunctional composite materials, in particular to a high thermal conductivity and flame-retardant polyolefin-based composite material and a preparation method thereof. Background technique [0002] With the continuous development of the electronics industry, various electronic devices and related components are gradually developing towards miniaturization, integration, and multi-function. The packaging density of devices and the operating frequency of chips continue to increase, resulting in increased energy consumption and heat accumulation. Seriously affect the normal operation of electronic equipment. In order to ensure long-term stable operation of electronic equipment, heat-conducting materials are required to effectively remove a large amount of heat accumulated inside the equipment. [0003] Traditional metal-based thermally conductive materials have the risk of electrical conduction when they are direc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L23/06C08L25/06C08L23/08C08L23/14C08K13/06C08K9/04C08K9/02C08K9/10C08K3/38C08K3/04
CPCC08K3/38C08K9/02C08K9/04C08K9/10C08K13/06C08K2003/385C08L2201/02C08L2201/08C08L2203/20C08L2207/062C08L2207/14C08K3/042C08L23/12C08L23/06C08L25/06C08L23/0815C08L23/14
Inventor 拜永孝鲁越
Owner LANZHOU UNIVERSITY
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