Radiation-resistant PP electret melt-blown material and preparation process thereof

Abstract

The invention relates to the technical field of melt-blown material preparation, and particularly discloses an irradiation-resistant PP (polypropylene) electret melt-blown material and a preparation process thereof. The melt-blown material is prepared from the following components in parts by weight: 80 to 100 parts of polypropylene resin, 10 to 20 parts of polylactic acid, 2 to 8 parts of electret master batch, 0.2 to 0.6 part of an antibacterial agent, 0.01 to 0.05 part of a nucleating agent, 1 to 4 parts of an antioxidant, 0.2 to 0.8 part of a lubricating agent, 0.1 to 0.5 part of an ultraviolet absorbent and 0.01 to 0.08 part of a light stabilizer, wherein the electret master batch is prepared from the following components in parts by weight: 50 to 80 parts of homo-polypropylene resin, 10 to 15 parts of modified nano silicon dioxide, 12 to 18 parts of modified nano white carbon black, 1 to 5 parts of an accelerant Tac and 1 to 9 parts of an electret agent. The defects in the prior art are overcome, the flexibility of the polypropylene melt-blown material is improved by adding the polylactic acid into the polypropylene resin, the filtering efficiency of the polypropylene melt-blown material is not influenced, the reaction is thorough, the molecular weight distribution is narrow, and the melt index is uniform.

Description

technical field [0001] The invention relates to the technical field of melt-blown material preparation, in particular to a radiation-resistant PP electret melt-blown material and a preparation process thereof. Background technique [0002] The nonwovens industry is developing rapidly in China, and the market is mainly dominated by spunbonded nonwovens, accounting for 50.09%. Meltblown nonwovens accounted for a relatively small proportion of production, only 0.9%. Melt-blown non-woven fabric is the key material for masks to achieve the filtering function, and is called the "heart" of medical masks. Melt-blown non-woven fabric is composed of many criss-cross fibers stacked in random directions. The fiber diameter can reach 1-5 microns, with many voids, fluffy structure, and good wrinkle resistance. It has good filterability, and after special electret treatment, it can greatly improve the filtration efficiency of melt-blown cloth and meet the requirements of N95 and N99. ...

AI Technical Summary

Problems solved by technology

[0003] Since the melt index of polypropylene itself is below 100g / 10min, it cannot meet the requirements of injection molding. At present, the treatment method usually adopted by domestic enterprises is chemical degradation method. Add peroxide degradation agent and other additives to the conventional polypropylene material with wide molecular weight distribution to carry out controllable chemical degradation, so that its molecular weight is reduced, thereby increasing the melt index; and the degradation of peroxide also has many disadvantages : First, the random fracture of the polypropylene main chain leads to poor toughness, and the produced melt-blown cloth is easy to tear and has low strength; secondly, the peroxide degradation is not complete, and the melt flow rate of the melt-blown material varies widely. Large, wide molecular weight distribution, melt-blown fluctuations, and residual peroxides will cause the produced melt-blown cloth to have a strong smell and make people feel uncomfortable; finally, the addition of electret masterbatch will also lead to uniform distribution of electret , the electret effect is poor, and the filter efficiency of meltblown cloth is low

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