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

A radiation-resistant and electret technology, which is applied in the manufacture of rayon, conjugated synthetic polymer rayon, and fiber chemical characteristics, can solve the problem of low filtration efficiency, low strength, and strong smell of melt-blown cloth. and other issues, to achieve the effect of safe and reliable production process, stable product quality and simple production process

Pending Publication Date: 2022-02-15
中核同辐(长春)辐射技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This embodiment discloses a preparation process of radiation-resistant PP electret melt-blown material, which specifically includes the following steps:

[0028] Step 1. Stir and mix 50 parts of modified nano-silica, 10 parts of modified nano-silica and 1 part of electret agent under heating conditions, then raise the temperature to 200-220 °C, and then add homopolypropylene resin 50 parts and 1 part of accelerator Tac are mixed evenly and sent to a twin-screw extruder, melted and mixed, extruded, wind-cut and dried to obtain electret masterbatch.

[0029] Among them, the preparation method of the modified nano-silica is as follows: put the nano-silica particles into an electrothermal constant-temperature blast drying oven, dry at 80°C for 5 hours, and then put them into a tank containing a mixture of absolute ethanol and deionized water. In a beaker, ultrasonically disperse for 30 minutes, add a silane coupling agent and stir evenly, adjust the pH to 4-5 with acetic ac...

Embodiment 2

[0041] This example is basically the same as the preparation process disclosed in Example 1, except that the electret masterbatch includes the following components in parts by weight: 65 parts of homopolypropylene resin, 12.5 parts of modified nano-silica, modified 15 parts of permanent nano-silica, 3 parts of accelerator Tac, and 5 parts of electret agent.

Embodiment 3

[0043] This example is basically the same as the preparation process disclosed in Example 1, except that the electret masterbatch includes the following components in parts by weight: 80 parts of homopolypropylene resin, 15 parts of modified nano-silica, modified 18 parts of permanent nano-silica, 5 parts of accelerator Tac, and 9 parts of electret agent.

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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. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L67/04C08K13/06C08K9/06C08K3/36C08K7/26C08K5/098D01F8/06D01F8/14D01F1/10
CPCC08L23/12D01F8/06D01F8/14D01F1/10C08L2205/24C08L67/04C08K13/06C08K9/06C08K3/36C08K7/26C08K5/098
Inventor 许文革冉祥海刘洋张宏岩聂伟苗亮付超郑宇王春博杜明轩钱景崔磊
Owner 中核同辐(长春)辐射技术有限公司
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