Flame-retardant polypropelene composition and preparation thereof

Abstract

The present invention discloses a flame retarding polypropylene composition and a preparation method thereof. The flame retarding polypropylene composition consists of the following compositions in percentage by weight: 80 to 90 percent of polypropylene, 5 to 10 percent of an organic bromine flame retardant, 3 to 5 percent of a flame retarding synergist, 0.1 to 0.5 percent of an antioxidant, 0.15 to 0.35percent of a light stabilizer, 0.3 to 1 percent of an acid absorption addition agent, and 0.3 to 0.5 percent of a lubricant; and the compositions are put into a double screw extruder to extrude granulations, after the compositions are mixed in a high-speed mixer for 1 to 2 minutes. The flame retarding polypropylene composition has the advantages of excellent thermo oxidative resistance and aging resistance, high melt strength, easy extrusion molding, small corrosiveness to a mould and high cost performance, and can meet the requirement of thermo oxidative stability and processability of a corrugated pipe for an automobile on the flame retarding polypropylene material during processes of extrusion processing and using.

Description

technical field [0001] The invention relates to a flame-retardant polypropylene composition and a preparation method thereof. Background technique [0002] Corrugated pipes for automobiles require materials with good flame retardancy, heat resistance, insulation, and material toughness, and will not crack after long-term use. Generally, flame-retardant polypropylene materials have poor heat resistance and are prone to cracking in hot environments, making it difficult to meet the long-term use requirements in hot environments. [0003] Patent CN1346844 introduces the preparation materials of rigid polyvinyl chloride double-wall corrugated pipes. The invention improves the lubricity of the materials and prevents the "decomposition" phenomenon in the production process. The material has excellent low-temperature plasticizing properties and mold release properties, and the product's impact strength, ring stiffness, and Vicat softening temperature have been significantly improve...

AI Technical Summary

Problems solved by technology

Due to the low thermal decomposition temperature of polyvinyl chloride, this kind of bellows cannot meet the long-term high-temperature use requirements of automotive bellows.

[0005] Patent CN2795602 introduces a double-wall corrugated pipe for coal mines. The double-wall corrugated pipe consists of a polyethylene inner wall containing a flame retardant and an antistatic masterbatch, and trapezoidal or arc-shaped corrugated pipes containing a flame retardant and an antistatic masterbatch. The outer wall of the polyethylene is pressed together; the pipe has strong flame retardant properties, non-toxic, corrosion-resistant, light in weight, easy to install, and high-pressure resistance, and is suitable for high-risk environments such as coal mines; but due to the low softening temperature of polyethylene , making the material difficult to use in the high temperature environment of the car

[0006] Although the flame-retardant polypropylene composition proposed in the prior art has the characteristics of good flame retardancy, insulation, and material toughness, it has problems such as easy corrosion of molds and low heat resistance, and cannot meet the requirements of automobile bellows for flame retardancy. Requirements for thermal oxygen stability and processability of polypropylene materials during extrusion processing and use