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A flexible polyurethane-based composite material with excellent flame retardant and electromagnetic shielding properties and its preparation method

A technology of flame-retardant composite materials and conductive composite materials, which is applied in the field of flexible polyurethane-based composite materials and its preparation, can solve the problems of poor flame-retardant performance and low shielding efficiency, achieve low percolation value, simple manufacturing process, and high-efficiency electrical conductivity -Effect of flame retardant network

Active Publication Date: 2021-09-24
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a preparation method of a composite material with excellent flame retardancy and electromagnetic shielding performance in view of the current situation of polymer-based electromagnetic shielding materials filled with conductive particles, that is, by constructing an isolation structure, constructing High-efficiency conductive-flame-retardant network to obtain composite materials with excellent flame-retardant properties and electromagnetic shielding properties; not only solves the problems of poor flame-retardant properties and low shielding effectiveness of existing shielding materials, but also endows materials with excellent flame-retardant properties and flexible

Method used

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  • A flexible polyurethane-based composite material with excellent flame retardant and electromagnetic shielding properties and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) The raw material is thermoplastic polyurethane (TPU), polybutylene succinate (PBS), carbon nanotube (CNT), intumescent flame retardant (IFR), and the conductive composite material is carbon nanotube filled polybutylene Butylene glycol ester, flame retardant composite material is thermoplastic polyurethane filled with intumescent flame retardant. The raw materials were dried in a vacuum oven at 80 °C for 24 h to remove moisture before use. First prepare conductive composite materials and flame-retardant composite materials, melt and mix the dried PBS and CNT in a twin-screw extruder at a temperature of 150 ° C, and prepare PBS / CNT composite masterbatches containing 6wt% CNT; Melt, mix and granulate the dried TPU and IFR in a twin-screw extruder at a temperature of 185°C to prepare a TPU / IFR composite masterbatch containing 25wt% IFR;

[0028](2) Weigh 70wt% TPU / IFR and 30wt% PBS / CNT pellets according to the proportion, then add PBS / CNT to the internal mixer and mix ...

Embodiment 2

[0036] (1) The raw material is thermoplastic polyurethane (TPU), polybutylene succinate (PBS), carbon nanotube (CNT), intumescent flame retardant (IFR), and the conductive composite material is carbon nanotube filled polybutylene Butylene glycol ester, flame retardant composite material is thermoplastic polyurethane filled with intumescent flame retardant. The raw materials were dried in a vacuum oven at 80 °C for 24 h to remove moisture before use. First prepare conductive composite materials and flame-retardant composite materials, melt and mix the dried PBS and CNT in a twin-screw extruder at a temperature of 150°C, and prepare PBS / CNT composite masterbatches containing 10wt% CNT; Melt, mix and granulate the dried TPU and IFR in a twin-screw extruder at a temperature of 185°C to prepare a TPU / IFR composite masterbatch containing 35wt% IFR;

[0037] (2) Weigh 60wt% TPU / IFR and 40wt% PBS / CNT pellets according to the proportion, then add PBS / CNT to the internal mixer and mix ...

Embodiment 3

[0044] (1) The raw materials are thermoplastic polyurethane (TPU), polybutylene succinate (PBS), carbon nanotubes (CNT), intumescent flame retardant (IFR), and the conductive composite material is carbon nanotube filled polystyrene Butylene succinate, flame retardant composite is intumescent flame retardant filled thermoplastic polyurethane. The raw materials were dried in a vacuum oven at 80 °C for 24 h to remove moisture before use. First prepare conductive composite materials and flame-retardant composite materials, melt and mix the dried PBS and CNT in a twin-screw extruder at a temperature of 150°C, and prepare PBS / CNT composite masterbatches containing 10wt% CNT; Melt, mix and granulate the dried TPU and IFR in a twin-screw extruder at a temperature of 185°C to prepare a TPU / IFR composite masterbatch containing 30wt% IFR;

[0045] (2) Weigh 75wt% TPU / IFR and 25wt% PBS / CNT pellets according to the proportion, then add PBS / CNT to the internal mixer and mix for 2 minutes, ...

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Abstract

The invention discloses a flexible polyurethane-based composite material with excellent flame-retardant and electromagnetic shielding properties and a preparation method thereof. The material prepared by the method is composed of a conductive composite material and a flame-retardant composite material, and is melt-blended and hot-pressed A sample with an isolated structure is obtained by molding. Among them, the conductive composite material is a polymer-based composite material filled with conductive fillers, and the flame-retardant composite material is a polymer-based composite material filled with flame retardant particles. The mass ratio of the conductive phase and the flame-retardant phase of the composite material with an isolation structure prepared by the preparation method provided by the invention, the thickness and performance of the sample can be controlled, and the raw material formula can be adjusted; the electromagnetic shielding performance and flame-retardant performance are excellent; the present invention The raw materials used are all commercially available, with wide sources and low cost, and the preparation process does not involve any chemical reaction and organic solvent, the production process is simple, safe and environmentally friendly, and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of polymer composite materials, and in particular relates to a flexible polyurethane-based composite material with excellent flame retardancy and electromagnetic shielding performance and a preparation method thereof. Background technique [0002] With the development of science and technology, electromagnetic waves are widely used in people's work and life. But while electromagnetic waves bring us convenience, electromagnetic waves escaping in the air will not only affect the normal operation of equipment, but also affect people's health and increase the risk of cancer. The most direct way to solve the harm of electromagnetic waves is to use electromagnetic shielding materials. Compared with metal-based electromagnetic shielding materials, polymer-based electromagnetic shielding materials filled with conductive fillers have the advantages of light weight, easy processing, corrosion resistance, and adjustabl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/04C08L67/02C08L67/04C08K3/04C08K3/016C08K5/00C08K3/32C08K7/24C08K7/06
CPCC08K2003/2224C08K2003/323C08K2201/001C08K2201/011C08L75/04C08L2201/02C08L67/02C08K3/041C08K3/016C08K5/0066C08K3/32C08L67/04C08K3/042C08K7/24C08K7/06C08K3/22
Inventor 沈佳斌王晴雯郭少云吉笑盈陈大勇
Owner SICHUAN UNIV
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