Special polypropylene material suitable for melt-blown non-woven fabric and preparation method of special polypropylene material

Abstract

The invention discloses a special polypropylene material suitable for melt-blown non-woven fabric. The special polypropylene material is prepared from the following raw materials in parts by weight: 98.16-99.64 parts of polypropylene; and 0.2 to 1.5 parts of IRGATEC CR 76 (Interstitial Regulated 0.01 to 0.08 part of a main antioxidant; 0.08 to 0.12 part of an auxiliary antioxidant; 0.03 to 0.06 part of an acid acceptor; and 0.04 to 0.08 part of a high-temperature lubricant. The special polypropylene material is uniform in fiber, the non-woven fabric produced from the special polypropylene material has better barrier property, higher density, higher mechanical stability and higher thermal stability than non-woven fabric produced from common melt-blown resin, and the preparation method is simple in process flow and operation, low in cost and suitable for wide production and application.

Description

technical field [0001] The invention belongs to the technical field of non-woven materials, and more specifically relates to a special polypropylene material suitable for melt-blown non-woven fabrics and a preparation method thereof. Background technique [0002] Due to the particularity of the polypropylene meltblown process, polypropylene special materials suitable for meltblown nonwovens must meet three conditions: (1) very high melt index (MFR), greater than 400g / 10min; (2) narrow Relative molecular mass distribution (MWD); (3) Very low ash content, polypropylene special materials with high melt index can meet the requirements of the melt blown process, produce qualified ultrafine fiber nonwovens, and reduce energy consumption . At present, for the production of melt-blown nonwovens, there are the following technical problems: if the relative molecular weight distribution is too wide, and the content of low relative molecular weight polypropylene is high, the stress cra...

AI Technical Summary

Problems solved by technology

At present, for the production of melt-blown nonwovens, there are the following technical problems: if the relative molecular weight distribution is too wide, and the content of low relative molecular weight polypropylene is high, the stress cracking of polypropylene will be easier, and it will be easier in the production process of nonwovens. Broken filaments; more ultra-high molecular weight polypropylene content will increase the viscosity of polypropylene, and even gel particles will appear, resulting in difficulties in the production of nonwovens; in addition, the ash content directly affects the screen change during the use of polypropylene cycle, so the ash also needs to be accurately controlled

[0003] The melt index of polypropylene special materials used in the meltblown process is generally greater than 400g / 10min, and conventional polypropylene raw materials cannot meet the requirements, so the melt index of polypropylene special materials must be increased

At present, the main ways to obtain high melt index propylene special materials are hydrogen adjustment method, peroxide degradation method and metallocene catalyst direct polymerization method. Although hydrogen adjustment method is simple, the range of adjusting the melt index of polypropylene special materials is limited. When polypropylene The melt index of special materials exceeds 30g / 10min, it is very difficult to produce by hydrogen adjustment method, and the relative molecular mass distribution of the product is too wide, which is not suitable for the production of meltblown nonwovens

The melt index of polypropylene special materials produced by metallocene catalyst direct polymerization has a large fluctuation range, all about 10%, but there is an odor

The preparation process of peroxide degradation method is relatively complicated and technically difficult