A kind of self-foaming plant fiber modified polypropylene material and preparation method thereof

Abstract

The invention discloses a self-foaming plant fiber-modified polypropylene bead and a preparation method thereof. The self-foaming plant fiber-modified polypropylene and the preparation method thereof are as follows: polypropylene, plant fiber, strong alkali, compatibilizer, Antioxidants, light stabilizers and other additives are combined according to a specific process. Compared with the traditional foamed polypropylene, the product of the present invention does not need to use additional foaming agent, utilizes the decomposition of the plant fiber itself to generate a cell structure, and at the same time improves the mechanical properties of the material.

Description

Technical field: [0001] The invention relates to polypropylene and a composition thereof, in particular to a self-foaming plant fiber modified polypropylene material and a preparation method thereof. technical background: [0002] Foamed polypropylene is widely used in automobiles, product packaging, sporting goods, toys and many other industries because of its low density, high strength, high heat resistance and good energy absorption and shock absorption properties. At present, there are two main foaming methods, including chemical foaming and physical foaming. Chemical foaming means adding a chemical foaming agent during injection molding of polypropylene, and the foaming agent decomposes in a high-temperature melt to generate a cell structure; chemical foaming agents are usually sodium bicarbonate and other chemical substances that can decompose gas. This kind of substance can usually be decomposed quickly under the action of high temperature. If the generated gas canno...

AI Technical Summary

Problems solved by technology

[0003] Patent CN101538387A discloses a polypropylene foam material and its production method, by feeding high-pressure supercritical N into the twin-screw extruder 2 or CO 2 , when the polypropylene melt and high-pressure gas are evenly mixed and extruded from the machine head, due to the instantaneous drop in pressure, the high-pressure gas expands rapidly to form a cell structure. This method has high foaming efficiency and fine and uniform cells. Pressing high-pressure inert gas into the extruder requires a very complicated inflation and pressurization system, and requires extremely high airtightness of the extruder

[0004] Patent CN109575448A discloses a micro-foamed polypropylene material and its preparation method, using a chemical foaming agent as the gas source and molecular sieves as a foaming stabilizer to obtain a high expansion ratio and smaller and more uniform cells, but this The foaming agent used in the method usually decomposes faster, and it is easy to generate air marks on the surface of the molded part, resulting in defective products

Images