Melt-blown polypropylene material composition and preparation method thereof

Abstract

The invention discloses a melt-blown polypropylene material composition and a preparation method thereof. The melt-blown polypropylene material composition comprises 95-99 parts of a melt-blown polypropylene material and 1-5 parts of electret master batch. The melt-blow polypropylene material is prepared from the following components in parts by weight: 98 to 99.85 parts of polypropylene, 0.1 to 1 part of free radical type initiator, 0.05 to 0.3 part of nucleating agent, 0 to 0.1 part of antioxidant and 0 to 0.3 part of lubricant. The electret master batch comprises the following components: 40-69.5 parts of melt-blown polypropylene, 2-5 parts of a waterproof and oil-proof agent, 5-10 parts of a softener, 10-15 parts of inorganic electret powder, 10-20 parts of organic electret powder, 1-3 parts of stearate, 1-3 parts of a hindered amine weather-resistant agent, 0.5-1 part of an antioxidant and 1-3 parts of a coupling agent. As the waterproof and oil-proof agent, the softener, the hindered amine weather-proof agent and the antioxidant can react with the free radical initiator in the melt-blown material system, the melt-blown polypropylene and the electret master batch are independently produced and mixed for use. According to the preparation method, a UV lamp box is placed before pelletizing, material strips are irradiated by a UV lamp, peroxide residues which do not react completely are completely cleaned, and zero peroxide residues are achieved.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to the technical field of modification of engineering plastics, in particular to a melt-blown polypropylene material composition and a preparation method thereof. Background technique [0002] Ultra-high fluidity polypropylene generally refers to a polypropylene material with a very high melt index (MI≥500g / 10min), which is often used as the main material for non-woven fabrics in the melt-blown process. At present, there are generally three processes for preparing ultra-high fluidity polypropylene. The present invention is to add a peroxide free radical initiator to conventional polypropylene, and obtain ultra-high fluidity polypropylene (that is, the oxygen adjustment method) by initiating a degradation reaction of controllable free radical molecular chain scission. The production cost of this process is low, The melt finger is precisely adjustable, and the product is suitable for...

AI Technical Summary

Problems solved by technology

While satisfying high fluidity, the toughness of the material usually drops significantly. The produced melt-blown cloth feels hard and brittle. On the one hand, it is prone to fracture problems during the production process, which affects production efficiency. In addition, the masks produced by using hard-feeling melt-blown cloth are also It will greatly reduce the wearing experience; the oxygen adjustment method will have peroxide residues, which will cause harm to the human body, and generally limit the peroxide residues to less than 5mg / Kg; in addition, the traditional formula system is difficult to meet the oily filtration index requirements of European and American masks

Images