Flame-retardant polyolefin compound and preparation method thereof

Abstract

The invention provides a preparation method of a flame-retardant polyolefin compound. The method comprises the following steps of (a) weighing 70-120 parts of polyolefin and 15-100 parts of an intumescent flame-retardant; (b) carrying out dry mixing on the polyolefin and the intumescent flame-retardant to obtain a dry mixture, adding the dry mixture to a first extruder and carrying out melting extrusion to obtain a pre-mixture; and (c) adding the pre-mixture to a second extruder, introducing supercritical carbon dioxide to 1 / 5-1 / 3 position of a screw rod of the second extruder and carrying out melting extrusion to obtain the flame-retardant polyolefin compound. The supercritical carbon dioxide is capable of promoting uniform dispersion of the intumescent flame-retardant in polyolefin, thereby obtaining the flame-retardant polyolefin compound with excellent flame-retardant property. The invention further provides the flame-retardant polyolefin compound.

Description

technical field [0001] The invention relates to the technical field of flame-retardant polymer materials, in particular to a flame-retardant polyolefin compound and a preparation method thereof. Background technique [0002] Polyolefin materials have the advantages of abundant raw materials, low price, easy processing and molding, and superior comprehensive performance. They are widely used in agriculture, machinery, electronics, packaging, automobiles, building materials and other fields, but they are flammable and have poor flame retardancy. Therefore, flame retardant treatment is required in many applications. At present, the flame retardancy of polyolefin is mainly achieved by adding various flame retardants. Although traditional halogen-containing flame retardants have good flame retardancy, they are prone to produce a large amount of smoke and toxic gases during production and use, resulting in secondary pollution. , so it is particularly important to develop halogen-...

AI Technical Summary

Problems solved by technology

However, hydrotalcite and montmorillonite also have poor compatibility with polyolefins and are difficult to disperse uniformly, so surface modification is usually required

However, since the modification of hydrotalcite and montmorillonite usually needs to be carried out in organic solvents such as toluene, it has the disadvantages of low grafting rate and complicated operation, and organic solvents are volatile, pollute the environment and harm the human body during use. Harmful and other issues

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