Flame-retardant polypropylene composite material as well as preparation method and application thereof

Abstract

The invention discloses a flame-retardant polypropylene composite material which comprises the following components in parts by weight: 100 parts of polypropylene resin; 20-50 parts of ammonium polyphosphate; 4-10 parts of a triazine charring agent; and 3-10 parts of a low melting point ester polymer; wherein the melting point of the low-melting-point ester polymer is lower than that of the polypropylene resin. By adopting the ester polymer with the melting point lower than that of polypropylene, the ester polymer is melted before the polypropylene in the melt extrusion process to wrap the flame retardant, so that the flame retardant is uniformly distributed in the flame-retardant polypropylene composition resin matrix, is not easy to migrate and separate out after long-time high-temperature baking, and has the advantage of good flame retardancy.

Description

Technical field[0001]The present invention relates to the field of polymer materials, and more particularly to a flame retardant polypropylene composite material and a preparation method thereof.Background technique[0002]Polypropylene Because of its excellent comprehensive performance and good cost performance, a wide process molding condition is one of the most widely used general plastics. Polypropylene is a typical flammable material, which is 17-18% of the ultimate oxygen index. It is extremely easy to combust, and it cannot be self-extinguishing after fire. As the material safety requirements are gradually improved, the polypropylene material must be flame retardant modification.[0003]The flame retardant for polypropylene is mainly divided into a bromine-based flame retardant and a halogen-free flame retardant. Although the bromine-containing flame retardant is the main flame retardant of the polypropylene resin, the bromine-based flame retardant has high flame retardant effici...

AI Technical Summary

Problems solved by technology

[0003] Flame retardants used for polypropylene are mainly divided into brominated flame retardants and halogen-free flame retardants. Although brominated flame retardants are the main flame retardants for polypropylene resins, brominated flame retardants have high flame retardant efficiency, Excellent heat resistance and less impact on physical properties, etc., but brominated flame retardants generally need to be used together with antimony compounds (mainly antimony trioxide), which have the disadvantages of high smoke density and high toxicity during combustion

In addition, since antimony itself will bring some environmental and carcinogenic risks, it will cause environmental pollution and endanger the safety of employees during the production and processing process, so there are many restrictions on its application

[0004] Among the existing flame-retardant modified polypropylene materials, in order to meet the requirements of low smoke density and non-halogenation, it is necessary to choose to add flame retardants containing phosphorus, nitrogen or their compound systems, mainly ammonium polyphosphate, supplemented by Char-forming agent and synergist, but the ammonium polyphosphate halogen-free flame retardant system has the disadvantages of large addition amount, low flame retardant efficiency, poor physical properties, and easy precipitation, especially in the high temperature and high humidity environment. It is easy to produce oily and powdery precipitates, which leads to great limitations in its wide application

In recent years, with the continuous increase in the application demand for materials in downstream industries, it is hoped that the materials will have good flame retardant efficiency, lower smoke density and excellent appearance properties, especially in the long-term process, there will be no obvious precipitation of foreign matter on the surface of the product , which makes the halogen-free ammonium polyphosphate flame retardant system have low smoke emission, but the migration and precipitation resistance performance is difficult to meet the downstream requirements

Images