Electret master batch for melt-blown non-woven fabric for low-resistance mask and preparation method of electret master batch

Abstract

The invention discloses electret master batch for melt-blown non-woven fabric for a low-resistance mask and a preparation method of the electret master batch. The electret master batch for the melt-blown non-woven fabric for the low-resistance mask is prepared from the following components in percentage by weight: 65-85% of polypropylene resin; 1-3% of electret powder; 5-15% of a dispersant; 3-10%of a nucleating agent; 3-10% of a softening agent; 0.05%-0.5% of a processing aid; wherein the softening agent is erucyl amide; the polypropylene resin is homo-polypropylene and/or co-polypropylene,and the melt index MFI of the polypropylene resin is 230 DEG C/2.16 kg and is not lower than 1000 g/10 min. According to the electret master batch, the softening agent, the nucleating agent and othercomponents are added, so that when the electret master batch and the ultra-high melt index polypropylene are mixed to be used for producing the melt-blown non-woven fabric for the mask, the obtained melt-blown non-woven fabric for the mask can have low respiratory resistance while having high filtering efficiency, and therefore the electret master batch is particularly suitable for being used as amask material. The formula does not greatly adjust the formula of the existing electret master batch, and is easy to implement.

Description

Technical field [0001] The invention relates to the field of melt-blown non-woven fabrics, in particular to electret master batches for melt-blown non-woven fabrics for low-resistance masks and a preparation method thereof. Background technique [0002] Melt-blown non-woven fabric for masks is a material for preparing filter masks. Although the filtration efficiency can be improved by electret treatment, only the electret treatment of the non-woven fabric itself can improve the filtration efficiency to a limited extent. In order to achieve the desired filtering effect, electret materials or electret masterbatches are generally added to the meltblown non-woven fabric formula for masks. However, the addition of electret masterbatch causes the resistance of the mask to rise greatly. Therefore, to make filter masks, it is necessary to balance the contradiction between the filtering effect and the resistance. [0003] In the prior art, there are two ways of thinking about adjusting th...

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Problems solved by technology

[0003] In the prior art, there are two ways of adjusting the process and formula to achieve it, but because there are many factors in the filtration performance and breathing resistance, such as the fiber linear density, the structure, thickness and density of the fiber web, etc., the work of adjusting the process becomes difficult. It is very complicated and difficult; formula adjustment seems to be a more feasible way of thinking, as disclosed in CN103046231A, in the formula of melt-spun nonwoven materials, the additives such as carboxylate metal salt, phosphoric acid metal salt, and transparent nucleating agent are used to control the content in the fiber web. The fineness distribution of the fibers, which improves their loft, but does not reflect the effect on breathing resistance

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