阅读说明：本技术 一种用于口罩熔喷布的长效熔喷聚丙烯复合驻极体材料及其制备方法 (Long-acting melt-blown polypropylene composite electret material for mask melt-blown cloth and preparation method thereof ) 是由 苏娟霞 杨波 罗忠富 黄险波 叶南飚 李力 杨友强 陈平绪 于 2020-06-09 设计创作，主要内容包括：本发明公开了一种用于口罩熔喷布的长效熔喷聚丙烯复合驻极体材料及其制备方法,所述长效熔喷聚丙烯复合驻极体材料包括如下重量份数的组分：聚丙烯树脂100份；氟硅聚合物0.1~10份；无机电荷增强剂0.01~2份；润滑剂0.1~2份；抗氧剂0.01~0.3份；所述氟硅聚合物为以硅氧键为主链、氟烷基为侧链的含氟聚硅氧烷。本发明的用于口罩熔喷布的长效熔喷聚丙烯复合驻极体材料中,氟硅聚合物的硅氧主链柔顺,有利于提高电荷注入深度,且氟烷基侧链促进电荷捕捉,同时产生偶极定向排列,还能掩盖主链,赋予布面良好的疏水性,使得材料具有良好的驻极效果,并有效提高了材料的长效性。而且,氟硅聚合物熔点低,均匀分散,该熔喷聚丙烯复合驻极体材料加工成型较为简单。(The invention discloses a long-acting melt-blown polypropylene composite electret material for mask melt-blown cloth and a preparation method thereof, wherein the long-acting melt-blown polypropylene composite electret material comprises the following components in parts by weight: 100 parts of polypropylene resin; 0.1-10 parts of a fluorine-silicon polymer; 0.01-2 parts of an inorganic charge enhancer; 0.1-2 parts of a lubricant; 0.01-0.3 part of antioxidant; the fluorine-silicon polymer is fluorine-containing polysiloxane which takes a siloxane bond as a main chain and a fluoroalkyl group as a side chain. In the long-acting melt-blown polypropylene composite electret material for mask melt-blown cloth, the silicone main chain of the fluorine-silicon polymer is flexible, so that the charge injection depth is favorably improved, the fluorine-alkyl side chain promotes charge capture, dipole directional arrangement is generated, the main chain can be covered, the cloth cover is endowed with good hydrophobicity, the material has a good electret effect, and the long-acting property of the material is effectively improved. And the melting point of the fluorine-silicon polymer is low, the fluorine-silicon polymer is uniformly dispersed, and the melt-blown polypropylene composite electret material is simpler to process and form.)

1. The long-acting melt-blown polypropylene composite electret material for mask melt-blown cloth is characterized by comprising the following components in parts by weight:

100 parts of polypropylene resin;

0.1-10 parts of a fluorine-silicon polymer;

0.01-2 parts of an inorganic charge enhancer;

0.1-2 parts of a lubricant;

0.01-0.3 part of antioxidant;

the fluorine-silicon polymer is fluorine-containing polysiloxane with a siloxane bond as a main chain and a fluoroalkyl group as a side chain, and the fluoroalkyl group is-CH₂CH₂R_fWherein R is_fIs a linear or branched perfluoroalkyl group having 2 to 9 carbon atoms; the fluorine content of the fluorine-silicon polymer is 50-55 wt%, and the viscosity average molecular weight of the fluorine-silicon polymer is 5000-50000 g/mol；

The melt flow rate of the polypropylene resin is 800-1800 g/10min under the conditions of 230 ℃ and 2.16kg load.

2. The long-acting melt-blown polypropylene composite electret material for mask melt-blown cloth according to claim 1, wherein the amount of the fluorosilicone polymer is 0.5 to 5 parts.

3. The long-acting melt-blown polypropylene composite electret material for mask melt-blown cloth according to claim 2, wherein the amount of the fluorosilicone polymer is 1 to 3 parts.

4. The long-acting melt-blown polypropylene composite electret material for mask melt-blown cloth according to claim 1, wherein the inorganic charge enhancer is one or more of tourmaline, zirconia, alumina, silica, barium titanate or strontium titanate.

5. The long-acting melt-blown polypropylene composite electret material for mask melt-blown cloth according to claim 1, wherein the lubricant is an amide lubricant and/or a stearate lubricant.

6. The long-acting melt-blown polypropylene composite electret material for mask melt-blown cloth according to claim 1, wherein the antioxidant is a hindered phenol antioxidant and/or a phosphite antioxidant.

7. The long-acting melt-blown polypropylene composite electret material for mask melt-blown cloth according to claim 1, wherein the long-acting melt-blown polypropylene composite electret material further comprises 0.01-0.3 part of a light stabilizer.

8. The long-acting melt-blown polypropylene composite electret material for mask melt-blown cloth according to claim 7, wherein the light stabilizer is a hindered amine light stabilizer.

9. The preparation method of the long-acting melt-blown polypropylene composite electret material for the mask melt-blown fabric according to any one of claims 1 to 6, which is characterized by comprising the following steps:

s11, taking 20-30 parts of polypropylene resin from 100 parts of polypropylene resin, mixing and extruding the polypropylene resin, the fluorosilicone polymer, the inorganic charge reinforcing agent, the lubricant and the antioxidant to obtain charge reinforcing agent master batches;

s12, blending and melt-blowing the residual polypropylene resin and the charge reinforcing agent master batch in the step S11 to obtain the long-acting melt-blown polypropylene composite electret material.

10. The method for preparing the long-acting melt-blown polypropylene composite electret material for mask melt-blown fabric according to claim 7 or 8, which comprises the following steps:

s21, taking 20-30 parts of polypropylene resin from 100 parts of polypropylene resin, mixing and extruding the polypropylene resin, fluorine-silicon polymer, inorganic charge reinforcing agent, lubricant, antioxidant and light stabilizer to obtain charge reinforcing agent master batch;

s22, blending and melt-blowing the residual polypropylene resin and the charge reinforcing agent master batch in the step S21 to obtain the long-acting melt-blown polypropylene composite electret material.

Technical Field

The invention relates to the technical field of polypropylene composite electret materials, in particular to a long-acting melt-blown polypropylene composite electret material for mask melt-blown cloth and a preparation method thereof.

Background

The melt-blown polypropylene composite electret material is a high-efficiency filter material, and its filtering principle mainly depends on the electrostatic effect of electret fibre to trap fine dust particles except all the blocking effects of general filter material, so that it has the advantages of small filtering resistance, thin filtering layer and good filtering effect. Has good filtering effect on fine solid dust particles and has good intercepting and filtering effect on aerosol, bacteria, smog and various pollen in the atmosphere.

Disclosure of Invention

The invention provides a long-acting melt-blown polypropylene composite electret material for mask melt-blown cloth, aiming at overcoming the defect of poor long-acting performance in the prior art, and the long-acting melt-blown polypropylene composite electret material has good long-acting performance of filtering performance and is simpler to process and form.

The invention also aims to provide a preparation method of the long-acting melt-blown polypropylene composite electret material for mask melt-blown cloth.

In order to solve the technical problems, the invention adopts the technical scheme that:

a long-acting melt-blown polypropylene composite electret material for mask melt-blown cloth comprises the following components in parts by weight:

100 parts of polypropylene resin;

0.1-10 parts of a fluorine-silicon polymer;

0.01-2 parts of an inorganic charge enhancer;

0.1-2 parts of a lubricant;

0.01-0.3 part of antioxidant;

the fluorine-silicon polymer is fluorine-containing polysiloxane with a siloxane bond as a main chain and a fluoroalkyl group as a side chain, and the fluoroalkyl group is-CH₂CH₂R_fWherein R is_fIs a linear or branched perfluoroalkyl group having 2 to 9 carbon atoms; the fluorine content of the fluorine-silicon polymer is 50-55 wt%, and the viscosity-average molecular weight of the fluorine-silicon polymer is 5000-50000 g/mol;

the melt flow rate of the polypropylene resin is 800-1800 g/10min under the conditions of 230 ℃ and 2.16kg load.

The terminal group of the siloxane bond main chain of the fluorosilicone polymer is generally a methyl group. The fluorosilicone polymer is commercially available.

The electret manner of the melt-blown polypropylene composite electret material can be conventional in the art, such as corona electret.

Through a great deal of research, the inventor finds that the fluorine-silicon polymer is matched with an inorganic charge reinforcing agent and added into polypropylene resin, so that the long-lasting effect of the melt-blown polypropylene composite electret material for mask melt-blown cloth can be effectively improved.

The silicon-oxygen main chain of the fluorine-silicon polymer is flexible, so that the cloth cover (the melt-blown non-woven fabric made of the melt-blown polypropylene composite electret material) is endowed with good fluffiness and softness, electric charges are promoted to enter deeper parts of the cloth cover in the electret process, and the long-acting property is facilitated. The fluoroalkyl groups constitute bulky polar side groups and include (1) polar fluorocarbon chains to promote charge trapping and to produce dipole-oriented alignment; (2) the side group of the fluorocarbon chain covers the main chain, so that the cloth cover is endowed with good hydrophobicity, and the diffusion of charges in the air is reduced. Namely, the silicon-oxygen main chain and the fluoroalkyl side chain are cooperated to enhance the electret effect of the material, and the long-acting property of the material is improved.

In the application, the addition amount of the fluorine-silicon polymer is also important, and if the addition amount is too low, the improvement effect on long-term filtration efficiency is not obvious; the addition amount is too high, the long-term filtration effect is not further increased, and the tensile strength of the cloth body is also reduced.

Moreover, the fluorine-silicon polymer has low melting point, is uniformly dispersed, and does not increase the processing and forming difficulty, and the long-acting melt-blown polypropylene composite electret material disclosed by the invention is simpler to process and form.

Preferably, the fluorine-silicon polymer accounts for 0.5-5 parts.

More preferably, the fluorine-silicon polymer accounts for 1-3 parts.

Preferably, the inorganic charge enhancer is one or more of tourmaline, zirconium oxide, aluminum oxide, silicon dioxide, barium titanate or strontium titanate. The inorganic charge enhancer is generally dispersed by a lubricant.

Preferably, the lubricant is an amide-based lubricant and/or a stearate-based lubricant.

Preferably, the amide lubricant is one or more of ethylene bis stearamide, stearyl erucamide or stearyl stearamide. Ethylene bis stearamide, abbreviated as EBS.

The stearate lubricant is one or more of magnesium stearate, lithium stearate, zinc stearate, calcium stearate or sodium stearate.

Preferably, the antioxidant is a hindered phenol antioxidant and/or a phosphite antioxidant.

Preferably, the hindered phenol antioxidant is one or more of antioxidant 1010, AO-330 and AO-20.

Preferably, the phosphite antioxidant is one or more of antioxidant 168, PEP-36 and P-EPQ.

Preferably, the long-acting melt-blown polypropylene composite electret material for mask melt-blown cloth further comprises 0.01-0.3 part of light stabilizer.

Preferably, the light stabilizer is a hindered amine light stabilizer.

Preferably, the hindered amine light stabilizer is poly { [6- [ (1,1,3, 3-tetramethylbutyl) amino ] ] -1,3, 5-triazine-2, 4- [ (2,2,6, 6-tetramethyl-piperidinyl) imino ] -1, 6-hexadiene [ (2,2,6, 6-tetramethyl-4-piperidinyl) imino ] } (e.g., Chimassorb 944) and/or 1,5,8, 12-tetrakis [4, 6-bis (N-butyl-N-1, 2,2,6, 6-pentamethyl-4-piperidinylamino) -1,3, 5-triazin-2-yl ] -1,5,8, 12-tetraazadodecane (e.g., Chimassorb 119).

The invention also provides a preparation method of the long-acting melt-blown polypropylene composite electret material for mask melt-blown cloth.

When no light stabilizer is added, the preparation method comprises the following steps:

s11, taking 20-30 parts of polypropylene resin from 100 parts of polypropylene resin, mixing and extruding the polypropylene resin, the fluorosilicone polymer, the inorganic charge reinforcing agent, the lubricant and the antioxidant to obtain charge reinforcing agent master batches;

s12, blending and melt-blowing the residual polypropylene resin and the charge reinforcing agent master batch in the step S11 to obtain the long-acting melt-blown polypropylene composite electret material.

When the light stabilizer is added, the preparation method comprises the following steps:

s21, taking 20-30 parts of polypropylene resin from 100 parts of polypropylene resin, mixing and extruding the polypropylene resin, fluorine-silicon polymer, inorganic charge reinforcing agent, lubricant, antioxidant and light stabilizer to obtain charge reinforcing agent master batch;

s22, blending and melt-blowing the residual polypropylene resin and the charge reinforcing agent master batch in the step S21 to obtain the long-acting melt-blown polypropylene composite electret material.

Compared with the prior art, the invention has the beneficial effects that:

the invention adds the fluorine-silicon polymer, the inorganic charge reinforcing agent and other reagents into the polypropylene resin to prepare the long-acting melt-blown polypropylene composite electret material for the mask melt-blown cloth. In the melt-blown polypropylene composite electret material, the silicon-oxygen main chain of the fluorine-silicon polymer is flexible, the charge injection depth is improved, the charge capture is promoted by the fluorine-alkyl side chain, the dipole directional arrangement is generated, the main chain can be covered, the cloth cover is endowed with good hydrophobicity, the material has a good electret effect, and the long-acting property of the material is effectively improved. And the melting point of the fluorine-silicon polymer is low, the fluorine-silicon polymer is uniformly dispersed, and the melt-blown polypropylene composite electret material is simpler to process and form.

Detailed Description

The present invention will be further described with reference to the following embodiments.