Halogen-free flame-retardant polypropylene master batch

Abstract

The invention relates to a halogen-free flame-retardant polypropylene master batch. The halogen-free flame-retardant polypropylene master batch comprises the following components in percentage by weight: 20 to 40 percent of polypropylene pellets, 40 to 60 percent of ammonium polyphosphate, 0.5 to 3.0 percent of flame-retardant synergist, 6 to 25 percent of halogen-free charring agent, and 5 to 15 percent of compatibilizer. A method for preparing the halogen-free flame-retardant polypropylene master batch comprises the following steps of: weighing raw materials according to the weight proportion, drying, and extruding and granulating by a co-rotating or counter-rotating twin-screw extruder, wherein the rotating speed of a screw is 70 to 200rpm; and the temperature is 160 to 230 DEG C. The disadvantages that the atactic polypropylene (APP) is independently added, so flame-retardant efficiency is low, the mechanical properties of matrixes are greatly influenced, great inconvenience is brought to the drying treatment of the raw materials, dust pollution is caused and the like are overcome. The invention has the advantages that: the flame-retardant synergistic effect can be well realized among components of the master batch, mixing and drying processes of the raw materials in the production process are simplified, and the production efficiency is improved; the dust in the production process is reduced, and the production environment is improved; and a flame-retardant polypropylene material prepared from the master batch has a good flame-retardant effect and excellent mechanical properties.

Description

technical field [0001] The invention relates to a chemical material, in particular to a halogen-free hindered alkene polypropylene masterbatch. Background technique [0002] It has become a trend in the development of flame-retardant polypropylene to realize halogen-free flame-retardant polypropylene and reduce the harm to the environment and human health. At present, the halogen-free flame retardant modification of polypropylene is mainly realized by adding halogen-free flame retardants, such as aluminum hydroxide, magnesium hydroxide, organic silicon flame retardants, P-N series flame retardants, etc., among which P-N series flame retardants The flame retardant is a polypropylene flame retardant with application prospects. Ammonium polyphosphate (APP) is the most important flame retardant in the P-N system. When APP is heated, it decomposes to form a strong dehydrating agent, polyphosphoric acid or polymetaphosphoric acid, which melts and covers the surface of the materia...

AI Technical Summary

Problems solved by technology

However, the flame retardant efficiency of adding APP alone is low, which has too much influence on the mechanical properties of the matrix, and the thermal stability of the material is poor.

In order to solve this problem and improve the efficiency of intumescent flame retardant, APP is often used together with molecular sieves, metal oxides, and char-forming agents, such as 4A molecular sieves, silicotungstic acid, zinc oxide, silica, alumina, pentaerythritol, cellulose, PA-6, etc., but still have a great influence on the mechanical properties

At the same time, the compounding of many components is the weighing of raw materials in the process of processing, and the drying treatment of raw materials brings great inconvenience and dust pollution.