Flame-retardant low-warpage glass fiber reinforced polypropylene composite material and preparation method thereof

Abstract

The invention provides a flame-retardant low-warpage glass fiber reinforced polypropylene composite material and a preparation method thereof. The flame-retardant low-warpage glass fiber reinforced polypropylene composite material comprises the following components: polypropylene resin, alkali-free glass fiber, organic coated modified silicon carbide powder, four-needle nanometer zinc oxide whiskers, a halogen-free flame retardant, dimethyl itaconate, a titanate coupling agent, a toughening agent, a heat stabilizer, an antioxidant and a lubricant. The preparation method comprises the followingsteps: adding polypropylene resin, alkali-free glass fiber accounting for 30-40% of the total mass, the titanate coupling agent, the halogen-free flame retardant, the toughening agent, the heat stabilizer, the antioxidant and the lubricant into a twin-screw extruder from a main feed port, adding the organic coated modified silicon carbide powder, dimethyl itaconate and the remaining alkali-free glass fiber into the twin-screw extruder from a side feed port, and performing melt extrusion and granulation, wherein the extrusion temperature is 205-245 DEG C. The composite material not only has relatively good low warpage and friction resistance, but also has very good flame retardant properties.

Description

technical field [0001] The invention belongs to the technical field of plastics, and in particular relates to a flame-retardant low-warpage glass fiber reinforced polypropylene composite material and a preparation method thereof. Background technique [0002] Polypropylene, as a general-purpose plastic, has entered every corner of daily life. Polypropylene modified with mineral powder has been widely used in household appliances due to its good rigidity, low shrinkage and deformation. The currently used method is to add elastomer materials to the polypropylene matrix to improve the impact strength, and to improve the tensile strength, bending strength and bending modulus by introducing 10-40% talcum powder, mica powder, wollastonite, kaolin and other fillers. The amount of scratch resistance is improved by introducing scratch resistance agents such as silicone masterbatches and amide-containing resins. [0003] Polypropylene is one of the five general-purpose plastics. It h...

AI Technical Summary

Problems solved by technology

But usually as the amount of glass fiber filled in polypropylene resin increases, the high degree of orientation makes a big difference between the shrinkage rate of the molded product in the flow direction and perpendicular to the flow direction, so that it causes warping of the final product, It is difficult to be used in rotating parts that require high dimensional stability, such as fans, inner barrels, pulsators, and pulleys. Large-scale products are prone to large warping and deformation. In addition, glass fibers are easily exposed on the surface of the product, resulting in surface damage. Poor performance, poor appearance, and at the same time, when the composition has a high filler content such as more than 35wt%, processing becomes difficult, reducing production efficiency and processing performance