High-toughness anti-falling polypropylene composite material, preparation method and application thereof

Abstract

The application provides a high-toughness anti-falling polypropylene composite material and a preparation method and application thereof. The polypropylene composite material comprises the following components in parts by mass: polypropylene-polyamide in-situ fiber forming composite material 40-100 parts, polypropylene 0-60 parts, maleic anhydride grafted elastomer 15-25 parts, and epoxy-based cage-shaped polyphenylsilsequioxane 1-3 parts. The polypropylene composite material has good tensile property, large bending modulus and high impact strength, and the low-temperature anti-falling property of the prepared plastic container is excellent.

Claims

1. A high-toughness, impact-resistant polypropylene composite material, characterized in that, The high-toughness and impact-resistant polypropylene composite material comprises the following components in parts by weight: 40-100 parts of polypropylene-polyamide in-situ fiber-forming composite material Polypropylene 0-60 parts 15-25 parts of maleic anhydride-grafted elastomer 1-3 parts of epoxy-based cage-type polysilsesquioxane; The polypropylene-polyamide in-situ fiber-forming composite material comprises the following components in parts by weight: 75-90 parts of polypropylene 10-25 parts of polyamide Compatibilizer 0-1.5 parts 2-4 parts of epoxy crosslinking agent Curing accelerator 0.1~0.5 parts; The epoxy crosslinking agent is one or a mixture of two of ethylene glycol glycidyl ether and diethylene glycol glycidyl ether. The curing accelerator is one or a mixture of phenol, 2,4,6-tris(dimethylaminomethyl)phenol, triethanolamine, N,N-dimethylethanolamine, and benzyl alcohol. The preparation method of the polypropylene-polyamide in-situ fiber-forming composite material includes the following steps: S01. Thoroughly mix polyamide, epoxy crosslinking agent and curing accelerator, then mix with compatibilizer and polypropylene to obtain premix; S02. The premixed material from step S01 is added to a twin-screw extruder and subjected to melt extrusion, hot stretching, quenching, and pelletizing to obtain in-situ fiberized plastic pellets. The temperature of the twin-screw extruder is set to 210~240℃, the screw speed is 100~300 r / min, and the traction roller motor speed is 50~70 r / min. S03. Place the plastic granules from step S02 in an oven at 100~130℃ for 8~12 hours to obtain the polypropylene-polyamide in-situ fiber-forming composite material.

2. The high-toughness, impact-resistant polypropylene composite material according to claim 1, characterized in that, The maleic anhydride-grafted elastomer is one or more of the following: maleic anhydride-grafted ethylene-octene copolymer, maleic anhydride-grafted ethylene-propylene copolymer, maleic anhydride-grafted ethylene-butene copolymer, maleic anhydride-grafted styrene-ethylene-butadiene-styrene block copolymer, and maleic anhydride-grafted ethylene-vinyl acetate rubber.

3. The high-toughness, impact-resistant polypropylene composite material according to claim 1, characterized in that, The epoxy-based cage-like polysilsesquioxane is one or a mixture of two of the following: epoxycyclohexyl-cage-like polysilsesquioxane and glycidyl etheroxypropyl-cage-like polysilsesquioxane.

4. The high-toughness, impact-resistant polypropylene composite material according to claim 1, characterized in that, The polyamide is one or a mixture of polycaprolactam, polyhexamethylene adipamide, polypentyl adipate diamine, and polydecanoyl decanediamide.

5. The high-toughness, impact-resistant polypropylene composite material according to claim 1, characterized in that, The compatibilizer is one or a blend of two of maleic anhydride-grafted polyolefins and glycidyl methacrylate-grafted polyolefins.

6. The method for preparing the high-toughness, impact-resistant polypropylene composite material according to any one of claims 1 to 5, characterized in that, Includes the following steps: S11. Add the polypropylene / polyamide in-situ fiber-forming composite material, polypropylene, maleic anhydride grafted elastomer, and epoxy-based cage-type polysilsesquioxane into a mixer and stir to mix evenly to obtain a mixture. S12. The mixture in S11 is extruded and granulated using a twin-screw extruder to obtain a high-toughness and impact-resistant polypropylene composite material. The temperature of the twin-screw extruder is set to 280~300℃, and the screw speed of the twin-screw extruder is 100~500rpm.

7. The application of the high-toughness and impact-resistant polypropylene composite material according to any one of claims 1 to 5 in plastic containers.

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