Low-warpage polypropylene composite and preparation method thereof

Abstract

The invention provides a low-warpage polypropylene composite and a preparation method thereof. The low-warpage polypropylene composite comprises 60-70 parts of polypropylene resin, 10-15 parts of continuous glass fibers, 10-15 parts of ethylene propylene diene monomers, 20-30 parts of organic coated modified silicon carbide powder, 8-12 parts of tetrapod-like nano-zinc oxide whiskers, 2-4 parts ofdibutyl itaconate, 1-3 parts of titanate coupling agent, 6-12 parts of toughening agent, 0.5-1.2 parts of heat stabilizer, 0.2-0.8 part of antioxygen and 0.6-1.8 parts of lubricant. The preparation method includes: adding the polypropylene resin, the continuous glass fibers, 30-40% by mass of the whole ethylene propylene diene monomers, the titanate coupling agent, the toughening agent, the heatstabilizer, the antioxygen and the lubricant into a double-screw extruder through a main feeding port, adding the other ingredients into the double-screw extruder through a side feeding port, and melting and extruding to pellet at a temperature of 200-240 DEG C. The low-warpage composite has the advantages of good low warpage and good friction resistance.

Description

technical field [0001] The invention belongs to the technical field of plastics, and in particular relates to a low warpage 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 has excellent performance and has been w...

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