Solid degradation agent for producing polypropylene fiber with high fusion index, and preparation method thereof

Abstract

The invention relates to a solid degradation agent for producing polypropylene fiber with high fusion index, and a preparation method thereof. The solid degradation agent comprises the following components, by weight, 74-87% of polypropylene, 5-20% of a peroxide, 4-5% of polyethylene wax PE520 and 2-3% of a PPA additive. The preparation method comprises: adding the raw materials to a mixer according to the ratio, and carrying out mixing for 4 minutes; adding the resulting mixture to a twin screw extruder; carrying out melting, extruding and pelletizing at a temperature of 120 DEG C to obtain the solid degradation agent. The solid degradation agent of the present invention completely retains the effect of the peroxide degradation agent to the PP product, the operation safeties during the transport and the use are improved, and the effective equivalent weight is high.

Description

technical field [0001] The invention relates to a solid degradation agent, in particular to a solid degradation agent for producing high melt index polypropylene products with narrow molecular weight distribution and a preparation method thereof. Background technique [0002] At present, the demand for polypropylene fibers with high melt index in the domestic market continues to increase. High-quality polypropylene fiber requires stable melt index and narrow molecular weight distribution of polypropylene products. To produce polypropylene products that meet this requirement, a degradation method is required, that is, by adding a degradation agent during the extrusion and granulation of polypropylene products with a wide molecular weight and low melt index to achieve the production of polypropylene with a narrow molecular weight distribution and a high melt index. Polypropylene products. [0003] In the process of synthesizing polypropylene, the traditional synthesis proces...

AI Technical Summary

Problems solved by technology

Since peroxides are easy to release oxygen when heated, and release a lot of heat, there is a danger of burning and explosion if there is a slight improper transportation and storage

Although very few solid peroxides are relatively safe, they are expensive

[0010] In addition, when the liquid peroxide is directly added to the polymer for viscosity reduction, the amount added is usually very small, so it is difficult to disperse the degradation agent evenly in the polymer.

If the dispersion is not uniform, it may cause the melt index of the product to be unstable and poor in uniformity, which will affect the continuity of downstream processing operations and the product quality of related products

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