Glass fiber reinforced polypropylene composition and preparation method thereof

Abstract

The invention provides a glass fiber reinforced polypropylene composition and a preparation method thereof. The glass fiber reinforced polypropylene composition is prepared from 30-60 parts of polypropylene, 1-10 parts of polyethylene, 25-45 parts of glass fibers, 0-5 parts of a flexibilizer, 5-10 parts of a nucleating agent and 5-10 parts of a surface improver through mixing and extrusion granulation. By mixing TAF in the surface improver with silicone, the compatibleness between polypropylene and the glass fibers is improved; and by forming an anchor-like knot, namely a cross-linking point between the glass fibers and polypropylene, the bonding state between the glass fibers and polypropylene is improved, and the separation between the glass fibers and resin is reduced, so that the exposure of the glass fibers is reduced. Besides, by utilizing short-cut glass fibers with a rectangular cross section, a fiber floating phenomenon can be reduced; besides, the short-cut glass fibers can be further mutually matched with the surface improver to jointly ameliorate the surface fiber floating caused after the injection molding of the glass fiber reinforced polypropylene composition and improve the compressive property of the glass fiber reinforced polypropylene composition.

Description

technical field [0001] The invention belongs to the field of polymer composite materials, and in particular relates to a glass fiber reinforced polypropylene composition and a preparation method thereof. Background technique [0002] Polypropylene is a non-toxic, odorless, tasteless milky white highly crystalline polymer with a molecular weight of about 80,000-150,000 and a density of only 0.90-0.91g / cm 3 , is currently one of the lightest varieties of all plastics. In addition, polypropylene is particularly stable to water, and its water absorption rate in water is only 0.01%. Polypropylene has good formability, but because of its large shrinkage rate, about 1% to 2.5%, thick-walled products are prone to dents, so it is difficult to meet the requirements for some parts with high dimensional accuracy. [0003] At present, polypropylene is mainly reinforced by adding glass fibers, which can improve the strength, heat distortion temperature and dimensional stability of pol...

AI Technical Summary

Problems solved by technology

[0004] However, after adding glass fiber, the phenomenon of floating fiber is easy to appear. The phenomenon of floating fiber is generally caused by the exposure of glass fiber. The white glass fiber floats on the surface during the filling and flow process of the plastic melt. After condensation molding, it will be on the surface of the plastic part. Form radial white traces, which will be more obvious when the plastic part is black due to the increased color difference

Therefore, the floating fiber phenomenon not only affects the appearance of PA parts, but also affects its performance as a pressure-resistant part.