Nano mesoporous molecular sieve synergistic intumescent flame retardant flame-retardant polypropylene

Abstract

A nano mesoporous molecular sieve synergistic intumescent flame retardant flame-retardant polypropylene disclosed in the invention relates to a composite material of a nano mesoporous molecular sieve, an intumescent flame retardant (IFR) and a polypropylene (PP). The blend is compounded by carrying out extrusion granulation of 0.5-5wt% of the molecular sieve, 20-35wt% of the intumescent flame retardant (namely ammonium polyphosphate / pentaerythritol) and 60-80wt% of the polypropylene pellets to finally obtain the molecular sieve / intumescent flame retardant / polypropylene composite material with excellent mechanical and flame retardant property, wherein, the intumescent flame retardant is compounded by ammonium polyphosphate and pentaerythritol. According to the invention, by adding the nano mesoporous molecular sieve to carry out synergistic flame retardant, the flame retardant efficiency is improved obviously, the residual amount of carbon residue and the density of carbon bed are increased, the problem of the significant drop of the mechanical property caused by adding a large number of flame retardant is alleviated effectively, so that the wide application filed of the material is ensured.

Description

technical field [0001] The invention relates to a flame-retardant polypropylene with a nano-mesoporous molecular sieve synergistic expansion flame retardant, in particular to a polypropylene flame-retardant technology, that is, a nano-mesoporous molecular sieve synergistic expansion flame retardant flame-retardant polypropylene. Background technique [0002] Polypropylene (PP) is widely used in various fields such as industry, automotive electronics, and architectural packaging due to its excellent characteristics such as convenient processing, light weight, electrical insulation, and non-toxicity. However, because polypropylene itself is a flammable material, its limiting oxygen index is only 17-18, and its combustion calorific value is large and accompanied by dripping, which limits its application in industries with high requirements for flame retardancy. Adding flame retardants is the most direct and simple way to improve the flame retardancy of polypropylene. [0003] ...

AI Technical Summary

Problems solved by technology

Although halogenated flame retardants have improved the flame retardant properties of polymers, their biggest feature is that they emit toxic gases when burned, causing great harm to the surrounding environment and the human body. The European Union began to implement the "ROHS Directive" in 2006. People gradually Abandoned the use of halogenated flame retardants

The biggest feature of metal oxide flame retardants is that they have poor compatibility with the matrix and a large amount of addition, resulting in a decline in the mechanical properties of the material, which largely limits its application in many fields

Intumescent flame retardants develop rapidly relying on their characteristics of halogen-free, low-smoke, and low-toxicity combustion, but intumescent flame retardants themselves also have shortcomings: the polarity difference with polymers is very large, resulting in poor compatibility with the matrix , and eventually lead to a decline in the mechanical properties of the material; the intumescent flame retardant has low relative molecular weight, strong hygroscopicity, poor thermal stability, and is easy to migrate to the surface of the polymer, which affects the appearance of the material; the intumescent flame retardant is a mixture of multiple components , it is very important to adjust the ratio of each component to its flame retardant performance

Therefore, it is difficult to break through the difficulty of improving the flame retardant performance and maintaining the mechanical properties of the material itself by simply relying on the addition of flame retardants.