High-strength high-toughness polypropylene blending composite material and preparation method thereof

Abstract

The invention discloses a blending compound material with high strength and toughness and the preparation method thereof and is characterized in that: (1) the preparation of PP graft: 100 parts of PP are added into an internal mixer to be melted. After that, 0.1 to 1 part of dicumyl peroxide (DCP) as initiator, 3 to 8 parts of grafting monomer (BPA) or (2A) are in sequence added to conduct grafting modification. The PP graft can be obtained under the temperature of 170-200 DEG C, 30-60 rmp of rotational speed and 5 minutes of reaction. (2) The preparation of PP blending compound material: 100 parts of PP, 5 to 30 parts of PC, 5 to 50 parts of toughening elastomer, 1 to 30 parts of bulking agents and 0.1 to 0.5 part of antioxidant are added into a high blending machine to conduct primary blending. Then the primary blending materials are put into a twin screw extruder to be blended and to realize extrusion pelletization under 230 DEG C to 270 DEG C temperature of extruder charging barrel and 50 to 150 rmp of rotational speed. Thereafter, the material obtained after the extrusion pelletization is dried under the temperature of 80 DEG C to 100 DEG C for 2 hours to 4 hours; finally, the blending compound material with high strength and toughness is made.

Description

technical field [0001] The invention relates to a high-strength and high-toughness polypropylene blended composite material and a preparation method thereof, belonging to the field of polymer processing. Background technique [0002] Polypropylene (PP) is one of the five general-purpose plastics. Due to its abundant sources, cheap price, easy processing and molding, excellent product comprehensive performance and wide range of uses, it has become the fastest-growing variety among general-purpose resins. However, there are still some deficiencies in its performance, such as low notched impact strength, low temperature brittleness, large shrinkage, poor creep resistance, poor dimensional stability of the product, easy to produce bending deformation, weather resistance, light resistance, heat resistance and aging resistance. Poor and other disadvantages greatly limit its engineering application. For this reason, it is of great significance to carry out high-performance modific...

AI Technical Summary

Problems solved by technology

However, its toughening effect is far inferior to that of rubber and thermoplastic elastomers, and due to poor compatibility with PP, it is often necessary to increase the amount of modifier or add a compatibilizer to make the system achieve higher toughness.

[0004] Chinese patent CN1640926A discloses a preparation method of a toughened polypropylene material. PP / EPDM is selected as a raw material, blended at 180-210°C, and then irradiated by gamma rays. The notched impact strength of the obtained material is 20-40KJ / m 2 , but does not specify the tensile strength index of the material

Tang Longxiang et al., J.Appl.Polym.Sci.2004, 92(5), described that in the molten state, under the condition that the photosensitizer doubles as a crosslinking agent, PP / EPDM (mass ratio 70 / 30) was exposed to ultraviolet light The photo-crosslinked PP / EPDM elastomer was prepared under the following conditions. Compared with the uncrosslinked blend, the notched impact strength of the material with a crosslinking degree of 30% increased from 35KJ / m 2 Increased to 48KJ / m 2 , but the tensile strength is only 17Mpa, the material preparation process is more complicated

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