Extrusion-grade filling reinforced halogen-free flame-retardant polypropylene and preparation method thereof

Abstract

The invention relates to the field of polypropylene high polymer materials, in particular to extrusion-grade filling reinforced halogen-free flame-retardant polypropylene and a preparation method thereof. The preparation method comprises the steps that raw material components are fed into a double-screw extruder from a feeding section, and after blending, melting and extruding, a polypropylene material is obtained; the raw material components comprise polypropylene resin, a phosphorus-nitrogen flame retardant, glass fibers, glass beads and other auxiliaries; the double-screw extruder sequentially comprises the feeding section, a melting and plasticizing section, a mixing section, a deliming section and an extruding section in the material conveying direction; a thread element of the feeding section comprises at least two forward conventional conveying type thread blocks and at least one forward large-lead deep groove thread block; and the forward large-lead deep groove threaded block is located between the forward conventional conveying type threaded blocks, the number of heads of the forward conventional conveying type threaded block located at the rear end of the forward large-lead deep-groove threaded block is two, and the ratio of the lead of the forward large-lead deep-groove threaded block to the screw diameter is (1.5-2): 1.

Description

technical field [0001] The invention relates to the field of polypropylene macromolecular materials, in particular to an extrusion-grade filling reinforced halogen-free flame-retardant polypropylene and a preparation method thereof. Background technique [0002] Polypropylene (PP) is a semi-crystalline thermoplastic. It has high impact resistance, strong mechanical properties, resistance to various organic solvents and acid and alkali corrosion, and is widely used in home appliances, automobiles and other fields. In order to make it flame-retardant and safe, the flame-retardant effect is improved by adding a flame retardant and blending through a twin-screw extruder. [0003] Brominated flame retardants are widely used in flame-retardant PP materials because of their high flame-retardant efficiency. However, in the event of a fire, toxic gases will be generated when the materials modified with brominated flame retardants are burned, causing secondary damage; At present, ha...

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Problems solved by technology

[0005] In order to solve the problem of glass beads, PP resin granules, compatibilizer granules and nitrogen-phosphorus flame retardant powder and other components mentioned in the technical background, during the feeding process, there are difficulties in conveying, obvious layering of materials and accumulation of powder Serious, problems that affect the quality of PP material products

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