阅读说明：本技术 一种聚丙烯熔融复合物及其应用 (Polypropylene melt compound and application thereof ) 是由 胡隆胜 于 2021-07-21 设计创作，主要内容包括：本发明涉及一种聚丙烯熔融复合物,制备方法包括：将吡啶硫酮锌纳米粒与液态聚乳酸-羟基乙酸共聚物加热共混后,经双螺杆挤出机,即得在聚乳酸-羟基乙酸共聚物中分散有吡啶硫酮锌纳米粒的中间复合物；将所述中间复合物与熔化后的聚丙烯搅拌均匀后,即得含有吡啶硫酮锌以及聚乳酸-羟基乙酸共聚物的聚丙烯熔融复合物；其中,所述吡啶硫酮锌纳米粒在所述聚丙烯熔融复合物中所占的质量百分比为0.001％-4.5％。本发明解决了吡啶硫酮锌与聚丙烯不能直接均匀熔融的问题,可配戴更长的时间,不会使佩戴者感受到异味,增加了佩戴舒适度等。(The invention relates to a polypropylene melt compound, which is prepared by the following steps: heating and blending zinc pyrithione nanoparticles and a liquid polylactic acid-glycolic acid copolymer, and then obtaining an intermediate compound with the zinc pyrithione nanoparticles dispersed in the polylactic acid-glycolic acid copolymer through a double-screw extruder; uniformly stirring the intermediate compound and the melted polypropylene to obtain a polypropylene molten compound containing zinc pyrithione and a polylactic acid-glycolic acid copolymer; wherein the zinc pyrithione nanoparticles account for 0.001-4.5% by mass of the polypropylene melt composite. The invention solves the problem that zinc pyrithione and polypropylene can not be directly and uniformly melted, can be worn for a longer time, can not cause a wearer to feel peculiar smell, increases the wearing comfort level and the like.)

1. A polypropylene melt composite prepared by a process comprising:

s1, heating and blending the zinc pyrithione nanoparticles and the liquid polylactic acid-glycolic acid copolymer, and then extruding the mixture by a double-screw extruder to obtain an intermediate compound in which the zinc pyrithione nanoparticles are dispersed in the polylactic acid-glycolic acid copolymer;

s2, uniformly stirring the intermediate compound prepared in the step S1 and the melted polypropylene to obtain a polypropylene melted compound containing zinc pyrithione and polylactic acid-glycolic acid copolymer;

wherein the zinc pyrithione nanoparticles account for 0.1-30% of the intermediate compound by mass;

wherein the intermediate compound accounts for 1.0-15% of the polypropylene melt compound by mass.

2. The polypropylene melt composite according to claim 1, wherein the zinc pyrithione nanoparticles are prepared by physical mechanical milling of zinc pyrithione particles to a diameter of not more than 100 μm.

3. The polypropylene melt composite as claimed in claim 1, wherein the liquid polylactic acid-glycolic acid copolymer is prepared by heating polylactic acid-glycolic acid copolymer to 150-165 ℃.

4. The polypropylene melt composite according to claim 3, wherein the polylactic acid-glycolic acid copolymer is 50:50 polylactic acid-glycolic acid copolymer or 75:25 polylactic acid-glycolic acid copolymer.

5. The polypropylene melt composite as claimed in claim 1, wherein the intermediate composite is prepared by heating and blending the zinc pyrithione nanoparticles and the liquid polylactic acid-glycolic acid copolymer at 140-160 ℃ and then extruding the mixture by a twin-screw extruder.

6. A polypropylene melt composite according to claim 1, wherein the intermediate composite has a diameter of not more than 1000 μm.

7. The polypropylene melt composite as claimed in claim 1, wherein the melted polypropylene is prepared by melting polypropylene at 180 ℃ and 160 ℃.

8. The polypropylene melt composite as claimed in claim 1, wherein the polypropylene melt composite is prepared by uniformly stirring the intermediate composite and the melted polypropylene at 160-180 ℃.

9. A meltblown fabric produced from the polypropylene melt composite of any one of claims 1-8 by melt extrusion, metering, melt blowing die assembly, melt trickle drawing, cooling, and receiving in sequence.

10. Use of the meltblown fabric of claim 9 in the manufacture of an antibacterial mask.

Technical Field

The invention relates to the field of melt-blown fabric manufacturing, in particular to a polypropylene melt compound and application thereof.

Background

The melt-blown fabric is the most core material of the mask, the melt-blown fabric mainly takes polypropylene as a main raw material, and the fiber diameter can reach 1-5 microns. The superfine fiber with the unique capillary structure increases the number and the surface area of the fiber per unit area, so that the melt-blown fabric has good filtering property, shielding property, heat insulation property and oil absorption property. However, the meltblown fabrics currently on the market do not have anti-mildew or anti-bacterial activity, and masks produced therefrom are generally uncomfortable to the wearer, produce off-flavors, etc., when worn for more than 1 hour.

Accordingly, there is a need for a polypropylene melt composite and applications thereof.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a polypropylene melt compound and application thereof, zinc pyrithione is an effective anti-mildew and anti-bacterial compound and can inhibit the growth of gram-positive and gram-negative bacteria and mildew, and the melt spray cloth prepared by combining the polypropylene melt spray compound with the polypropylene has obvious anti-mildew and anti-bacterial effects.

In order to achieve the purpose, the invention adopts the technical scheme that:

in a first aspect of the present invention, there is provided a polypropylene melt composite prepared by a process comprising:

s1, heating and blending the zinc pyrithione nanoparticles and the liquid polylactic acid-glycolic acid copolymer, and then extruding the mixture by a double-screw extruder to obtain an intermediate compound in which the zinc pyrithione nanoparticles are dispersed in the polylactic acid-glycolic acid copolymer;

s2, uniformly stirring the intermediate compound prepared in the step S1 and the melted polypropylene to obtain a polypropylene melted compound containing zinc pyrithione and polylactic acid-glycolic acid copolymer;

wherein the zinc pyrithione nanoparticles account for 0.1-30% of the intermediate compound by mass;

wherein the intermediate compound accounts for 1.0 to 15 percent of the polypropylene melt compound by mass;

namely, the zinc pyrithione nanoparticles account for 0.001-4.5 percent of the polypropylene melt compound by mass percentage.

Preferably, the zinc pyrithione nanoparticles are prepared by physical mechanical milling of zinc pyrithione particles to a diameter of not more than 100 μm.

Preferably, the liquid polylactic acid-glycolic acid copolymer is prepared by heating the polylactic acid-glycolic acid copolymer to 150-165 ℃.

Preferably, the polylactic acid-glycolic acid copolymer is a 50:50 polylactic acid-glycolic acid copolymer or a 75:25 polylactic acid-glycolic acid copolymer.

Preferably, the intermediate compound is prepared by heating and blending the zinc pyrithione nanoparticles and the liquid polylactic acid-glycolic acid copolymer at the temperature of 140-160 ℃ and then using a double-screw extruder.

Preferably, the diameter of the intermediate complex does not exceed 1000 μm.

Preferably, the melted polypropylene is made from polypropylene melted at 160-180 ℃.

Preferably, the polypropylene melt compound is prepared by uniformly stirring the intermediate compound and the melted polypropylene at the temperature of 160-180 ℃.

The second aspect of the invention provides a melt-blown fabric, which is prepared from the polypropylene melt compound sequentially through melt extrusion, a metering pump, a melt-blowing die head assembly, melt trickle stretching, cooling and a receiving device.

A third aspect of the present invention is to provide a use of the meltblown fabric as described above for the manufacture of an anti-bacterial mask.

By adopting the technical scheme, compared with the prior art, the invention has the following technical effects:

the invention solves the problem that zinc pyrithione and polypropylene can not be directly and uniformly melted, and the mask produced by the melt-spraying of the zinc pyrithione and polypropylene compound has obvious advantages compared with the traditional polypropylene melt-spraying mask: the shoe pad can be worn for a longer time, a wearer cannot feel peculiar smell, the wearing comfort level is improved, and the like; the particle size of the zinc pyrithione nanoparticles is not more than 100 mu m, so that the zinc pyrithione nanoparticles are prevented from being peeled off from the polylactic acid-glycolic acid copolymer; the particle size of the polylactic acid-glycolic acid copolymer compound dispersed with the zinc pyrithione nano-particles is not more than 1000 μm, thereby preventing the compound from peeling from polypropylene and finally failing to obtain the antibacterial effect.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention.

Example 1

S1-1, preparing zinc pyrithione nanoparticles: grinding 1kg of zinc pyrithione powder particles to D by a NW nano-scale wet grinding pulverizer by adopting a physical mechanical grinding method₅₀Zinc pyrithione nanoparticles 50 μm;

s1-2, preparing a liquid polylactic acid-glycolic acid copolymer: heating 20kg of polylactic acid-glycolic acid copolymer (50:50) to a flowable liquid state at 160 ℃ in a steel pot;

s1-3, heating and blending the zinc pyrithione nanoparticles and the liquid polylactic acid-glycolic acid copolymer at 155 ℃, and extruding the mixture by using an SHJ-35 double-screw extruder to obtain an intermediate compound (D is more than or equal to 500 mu m and less than or equal to D) with the zinc pyrithione nanoparticles dispersed in the polylactic acid-glycolic acid copolymer₅₀≤800μm)；

S2, heating to 170 ℃, adding 100kg of polypropylene melted in a stainless steel pot into the intermediate compound, and uniformly stirring by a stainless steel stirring blade at the rotating speed of 3000RPM to obtain a polypropylene melted compound containing zinc pyrithione and polylactic acid-glycolic acid copolymer;

the polypropylene melt compound prepared by the steps can be directly used as a raw material of melt-blown cloth;

the melt-blown cloth prepared by the polypropylene melt compound can be used for producing an antibacterial mask;

the polypropylene melt compound prepared by the steps can also be directly used as the raw material of other clothes (such as gloves and the like).

Example 2

S1-1, preparing zinc pyrithione nanoparticles: grinding 1kg of zinc pyrithione powder particles to D by a NW nano-scale wet grinding pulverizer by adopting a physical mechanical grinding method₅₀Zinc pyrithione nanoparticles 75 μm;

s1-2, preparing a liquid polylactic acid-glycolic acid copolymer: heating 10kg of polylactic acid-glycolic acid copolymer (75:25) to a mobile liquid at 165 ℃ in a steel pot;

s1-3, heating and blending the zinc pyrithione nanoparticles and the liquid polylactic acid-glycolic acid copolymer at 160 ℃, and passing through an SHJ-35 twin-screw extruder to obtain an intermediate compound (D is more than or equal to 500 mu m and less than or equal to D) with zinc pyrithione nanoparticles dispersed in the polylactic acid-glycolic acid copolymer₅₀≤800μm)；

S2, heating to 180 ℃, adding 75kg of polypropylene melted in a stainless steel pot into the intermediate compound, and uniformly stirring by a stainless steel stirring blade at the rotating speed of 3000RPM to obtain a polypropylene melted compound containing zinc pyrithione and polylactic acid-glycolic acid copolymer;

the polypropylene melt compound prepared by the steps can be directly used as a raw material of melt-blown cloth;

the melt-blown cloth prepared by the polypropylene melt compound can be used for producing an antibacterial mask;

the polypropylene melt compound prepared by the steps can also be directly used as the raw material of other clothes (such as gloves and the like).

Example 3

S1-1, preparing zinc pyrithione nanoparticles: grinding 1kg of zinc pyrithione powder particles to D by a NW nano-scale wet grinding pulverizer by adopting a physical mechanical grinding method₅₀25 μm zinc pyrithione nanoparticles;

s1-2, preparing a liquid polylactic acid-glycolic acid copolymer: heating 40kg of polylactic acid-glycolic acid copolymer (50:50) to a flowable liquid at 150 ℃ in a steel pot;

s1-3, heating and blending the zinc pyrithione nanoparticles and the liquid polylactic acid-glycolic acid copolymer at 140 ℃, and performing SHJ-35 twin-screw extruder to obtain an intermediate compound (D is more than or equal to 500 mu m and less than or equal to D) with the zinc pyrithione nanoparticles dispersed in the polylactic acid-glycolic acid copolymer₅₀≤800μm)；

S2, heating to 160 ℃, adding 300kg of polypropylene melted in a stainless steel pot into the intermediate compound, and uniformly stirring by a stainless steel stirring blade at the rotating speed of 3000RPM to obtain a polypropylene melted compound containing zinc pyrithione and polylactic acid-glycolic acid copolymer;

the polypropylene melt compound prepared by the steps can be directly used as a raw material of melt-blown cloth;

the melt-blown cloth prepared by the polypropylene melt compound can be used for producing an antibacterial mask;

the polypropylene melt compound prepared by the steps can also be directly used as the raw material of other clothes (such as gloves and the like).

The invention solves the problem that zinc pyrithione and polypropylene can not be directly and uniformly melted, and the mask produced by the melt-spraying of the zinc pyrithione and polypropylene compound has obvious advantages compared with the traditional polypropylene melt-spraying mask: the shoe pad can be worn for a longer time, a wearer cannot feel peculiar smell, the wearing comfort level is improved, and the like; the particle size of the zinc pyrithione nanoparticles is not more than 100 mu m, so that the zinc pyrithione nanoparticles are prevented from being peeled off from the polylactic acid-glycolic acid copolymer; the particle size of the polylactic acid-glycolic acid copolymer compound dispersed with the zinc pyrithione nano-particles is not more than 1000 μm, thereby preventing the compound from peeling from polypropylene and finally failing to obtain the antibacterial effect.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.