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Trimeric cyanamide cyanureate fire retarding polyamide nano-composite meterial and its preparation method

A technology of melamine cyanurate and melamine cyanurate, which is applied in the field of melamine cyanurate flame-retardant polyamide nanocomposites and its preparation, can solve the problems of long reaction time, toxicity, and high viscosity of the system, Achieve the effects of excellent flame retardancy and mechanical properties, broad application prospects, and simplified process

Active Publication Date: 2006-06-14
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inorganic flame retardants and phosphorus flame retardants in the halogen-free flame retardant system also face various problems: the addition of inorganic flame retardants is large, the flame retardant efficiency is low, and the mechanical properties of the matrix material are greatly damaged; Phosphorus-based flame retardants have disadvantages such as coloration, toxicity, and high exudation
This reaction has the following problems: the reactants MEL and CA have low solubility in water and poor dispersibility, and the generated MCA has a large planar hydrogen bond network structure and a large hydrodynamic radius, which leads to high viscosity of the system, difficulty in stirring, and long reaction time
U.S. Patent (US Patent 5,037,869) has reported a kind of method for preparing flame-retardant polyamide resin material, and this method mixes nylon, melamine or derivative thereof and cyanuric acid, ethylene glycol or its polycondensate and phthalate in Melt blending and extrusion in the presence of water improved the flame retardant properties and mechanical properties of flame retardant materials, but did not realize the nanometerization of the particle size of the product MCA and its nanodispersion in the matrix resin

Method used

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  • Trimeric cyanamide cyanureate fire retarding polyamide nano-composite meterial and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]Put 0.05kg of dinonyl phthalate, 0.5kg of water and 30kg of nylon 6 into a closed container, stir, and leave it closed for 2 hours, then add 0.1kg of melamine, 0.1kg of cyanuric acid, 0.05kg of glycerin and Tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid]pentaerythritol ester 0.001kg, stirred, mixed evenly, then added to a twin-screw extruder, extruded and granulated at a temperature of 240°C , dried, and the obtained pellets were injected into vertical combustion splines by an injection molding machine, and the injection molding temperature was 240°C. After testing, the vertical combustion performance of the sample reached UL94 V-2 level. SEM analysis shows that the radial size of MCA particles in the flame retardant material is 50-70nm.

Embodiment 2

[0037] Put 3.6kg of dioctyl phthalate, 11.0kg of water and 200kg of nylon 66 into a closed container, stir, and leave it closed for 4 hours, then add 8.6kg of melamine, 8.6kg of cyanuric acid, 1.8kg of caprolactam, and 3.6 kg of pentaerythritol kg, 0.18 kg of tris(2,4-di-tert-butyl) phosphite and 0.10 kg of copper stearate, stirred and mixed evenly, then added to a twin-screw extruder, extruded and granulated at a temperature of 260°C, and dried , to obtain flame-retardant pellets, which are injected into vertical combustion splines by injection molding machine, and the injection molding temperature is 260°C. After testing, the vertical combustion performance of the sample reached the UL94 V-0 level. SEM analysis shows that the radial size of MCA particles in the flame retardant material is 60-80nm.

Embodiment 3

[0039] Place 50kg of diundecyl phthalate, 50kg of water and 700kg of nylon 66 in a closed container, stir, and leave it closed for 6 hours, then add 150kg of melamine, 150kg of cyanuric acid, 50kg of pentaerythritol, three (2, 10kg of 4-di-tert-butyl) phosphite and 10kg of copper acetate, stirred, mixed evenly, then added to a twin-screw extruder, extruded and granulated at a temperature of 260°C, dried to obtain flame-retardant pellets, passed through an injection molding machine Injection molded into vertical burning splines, the injection temperature is 260 ℃. After testing, the vertical combustion performance of the sample reached the UL94 V-0 level. SEM analysis shows that the radial size of MCA particles in the flame retardant material is 60-300nm.

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Abstract

The present invention relates to a melamine cyanurate (MCA) fire-resisting polyamide nano composite material and its preparation method. It is characterized by that it uses melamine (MEL) and cyanuric acid (CA) as raw material, uses polyamide as base body resin and uses water as dispersion medium, under the action of molecular recombiner and water-tying plasticizer, in the course of extrusion it can in-situ synthesize MCA and prepare fire-resisting polyamide nano composite material.

Description

Technical field: [0001] The invention relates to a melamine cyanurate flame-retardant polyamide nanocomposite material and a preparation method thereof, belonging to the field of molding and processing of flame-retardant polymer materials. Background technique: [0002] Polyamide (nylon) is the earliest engineering plastic developed in the world. It has excellent mechanical properties, wear resistance, oil resistance and general organic solvents, and excellent heat resistance. It is used in the fields of automobiles, mechanical instruments, electronics, defense, aviation and other fields. Wide range, especially commonly used in harsh environments, such as high humidity, high temperature, high voltage, etc. However, the limiting oxygen index (LOI) of polyamide is low (about 23), it is easy to burn, the calorific value is large, and the burning speed is fast. During the combustion process, a large amount of smoke and molten droplets will be generated, which is easy to spread t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/00B29C47/40C08K5/3492
Inventor 王琪陈英红刘渊华正坤
Owner SICHUAN UNIV
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