Long glass fibre reinforced polypropylene material and preparation method thereof

Abstract

The invention belongs to field of a polymer material and shaping thereof, in particular to a long glass fiber reinforced polypropylene material and a preparation method thereof. The long glass fiber reinforced polypropylene material is prepared from the following components: 35-68wt% of polypropylene, 30-60wt% of long glass fiber, 1-5wt% of compatilizer and 0.3-1.0wt% of antioxidant, wherein the polypropylene is polypropylene with a melt index as high as 50-500g / 10min. The preparation method comprises the following steps: mixing the polypropylene, the compatilizer and the antioxidant; feeding the mixture in a double-screw extruder; enabling the long glass fiber to be fully soaked by melts through a soaking die; and cooling, drawing and pelletizing the fully soaked long glass fiber to obtain the long glass fiber reinforced polypropylene material. By the invention, the soaking effect of the glass fiber in polypropylene melts can be reinforced, substances harmful to human bodies can be eliminated or reduced, the odor is lightened, and the soaking effect and mechanical property of the material can be effectively improved.

Description

technical field [0001] The invention belongs to the field of polymer materials and their molding processing, and relates to a long glass fiber reinforced polypropylene material and a preparation method thereof. Background technique [0002] In the manufacturing process of short fiber reinforced thermoplastics, when the fiber is mixed with the resin in the extruder, the fiber will be damaged due to the shear between the screw and the barrel. The original 6mm fiber is in the pellet. The length becomes 0.2-1mm (generally below 0.7mm). Since the properties of reinforced plastics are related to fiber length, short fibers are difficult to use for structural purposes. The length of glass fiber in long glass fiber reinforced polypropylene material is longer, and the distribution of fiber length is better, which can improve the mechanical properties of the product, especially the impact strength is significantly improved, and the rigidity is increased, which is conducive to the appl...

AI Technical Summary

Problems solved by technology

However, the flow modifier is PP cooling masterbatch, the main component is peroxide, and the free radical termination reaction between peroxide and antioxidant in the system will cause a large amount of peroxide to be consumed by the reaction of antioxidant, which is not only for The improvement of polypropylene fluidity is limited, which affects the impregnation effect, and the stability of polypropylene fluidity improvement is also very poor, and product quality control is very difficult; at the same time, due to free radical termination reactions between peroxides and antioxidants in the system, Peroxide will consume a large amount of antioxidants, and the thermal stability of the material will be greatly reduced, resulting in a greatly shortened service life of the material