CN111662505B

CN111662505B - Antibacterial nonwoven material and preparation method thereof

Info

Publication number: CN111662505B
Application number: CN202010549567.XA
Authority: CN
Inventors: 丛桂阳; 邬慧荣; 王金华; 贾付华; 张春才; 张文博; 胡朔
Original assignee: Jiangsu Ding Su Industry Co ltd
Current assignee: Jiangsu Ding Su Industry Co ltd
Priority date: 2020-06-16
Filing date: 2020-06-16
Publication date: 2023-05-02
Anticipated expiration: 2040-06-16
Also published as: CN111662505A

Abstract

The invention discloses a bacteriostatic non-woven material and a preparation method thereof, and belongs to the technical field of non-woven material preparation. The antibacterial nonwoven material comprises 80-120 parts of polypropylene, 0.5-2 parts of initiator A, 0.1-2 parts of antioxidant, 1-3 parts of antibacterial agent, 3-10 parts of electret master batch, 0.1-2 parts of nucleating agent, 10-20 parts of LMPP and the antibacterial agent which is silver ion antibacterial agent or zinc ion antibacterial agent; the preparation method comprises the following steps: compounding, melt extrusion, mixing homogenization, and melt-blown molding, and antioxidant is added in the 10 th heating section of an extruder with 13 heating sections. The antibacterial nonwoven material product can be used for preparing medical consumables such as masks, surgical caps and the like, can also be used for manufacturing sanitary products for women, has long-acting and lasting antibacterial effect, and has higher safety in direct contact with skin or wounds. In addition, the antioxidant is added in the 10 th heating section, so that the controllability of a molten finger can be improved, the dosage of an initiator A can be reduced, and the oxidation resistance of a product can be improved.

Description

Antibacterial nonwoven material and preparation method thereof

Technical Field

The invention relates to the technical field of non-woven material preparation, in particular to a bacteriostatic non-woven material and a preparation method thereof.

Background

The nonwoven material is a nonwoven material which is processed by adopting a nonwoven technology different from the traditional textile technology and by mechanical, thermal bonding and the like, has the properties of cloth appearance, softness, water absorption, air permeability and the like, and has the characteristics of low price, recycling, no toxicity, no stimulation and the like.

Currently, nonwoven materials have large-scale uses in the field of medical supplies and women's sanitary supplies, such as masks, surgical towels, surgical caps, protective wear, sterilization wraps, diapers, sanitary napkins, and the like. Because the nonwoven materials used in these fields are often in direct contact with the skin or wound, the nonwoven materials with bacteriostatic properties are more safe for the user.

The Chinese patent with publication number of CN103161071B discloses a bacteriostatic non-woven fabric and a preparation method thereof, wherein after the non-woven fabric is formed, polymer film forming agents are coated on the upper surface and the lower surface of the non-woven fabric to improve the bacteriostatic effect of the non-woven fabric and prolong the bacteriostatic time, so that the bacteriostatic protection effect is achieved. The polymer film forming agent comprises high molecular polymer emulsion, a bacteriostatic agent and an auxiliary agent, wherein the bacteriostatic agent is one or more than two of benzethonium chloride, polyhexamethylene guanidine, benzalkonium chloride, benzalkonium bromide, imidazolidinyl urea, isothiazolinone or quaternary ammonium salt bacteriostatic agent, triclosan, triclocarban, IPBC and DMDMH.

The polymer film forming agent in the prior art contains a bacteriostatic agent, and a layer of bacteriostatic protective barrier can be formed on the surface of the non-woven fabric after the non-woven fabric is coated with the bacteriostatic agent, but the surface of the bacteriostatic non-woven fabric is subjected to risk of falling off after being folded, rubbed or used for a long time, so that the bacteriostatic effect can be obviously reduced.

Disclosure of Invention

Aiming at the defects existing in the prior art, the first aim of the invention is to provide a bacteriostatic non-woven material, which is used for melt mixing a bacteriostatic agent and preparation raw materials of the non-woven material, so that the bacteriostatic agent can be integrated with the non-woven material, the risk of falling off of the bacteriostatic agent and the non-woven material is reduced, and a long-acting and lasting bacteriostatic effect can be achieved.

The second object of the present invention is to provide a method for preparing a bacteriostatic nonwoven material, which has the effects of simple process and easy improvement of melting uniformity in the raw material processing process, thereby improving the product quality.

In order to achieve the first object, the present invention provides the following technical solutions: antibacterial nonwoven material, and preparation method thereofFrom the following componentsThe material is prepared from the following raw materials in parts by weight: 80-120 parts of polypropylene, 0.5-2 parts of initiator A, 0.1-2 parts of antioxidant, 1-3 parts of antibacterial agent, 3-10 parts of electret master batch and 0.1-2 parts of nucleating agent.

By adopting the technical scheme, the polypropylene is used as the basic raw material of the antibacterial nonwoven material in the scheme, has the characteristics of no toxicity, no odor and no smell, and is basically harmless to the body of a user after being manufactured into the nonwoven material which is in direct contact with skin or wounds.

The antibacterial agent is taken as one of the nonwoven raw materials in the scheme, and is directly processed with other nonwoven raw materials to prepare the nonwoven, compared with the antibacterial nonwoven prepared by coating the antibacterial agent on the formed nonwoven in the prior art, the antibacterial agent in the scheme is melt-blended with other raw materials such as polypropylene into a whole in the processing process, so that the antibacterial agent can be dispersed in the fibers of the nonwoven from inside to outside, and therefore, the risk of falling off of the antibacterial agent in the later nonwoven using process is reduced to a great extent, and the antibacterial performance of the antibacterial nonwoven is stronger. Meanwhile, the antibacterial agent is arranged in the antibacterial non-woven material, so that the possibility of mildew from inside to outside caused by carelessly polluting microorganisms in the material manufacturing process is reduced. In addition, the antibacterial agent is processed in the nonwoven material fiber without coating, so that the antibacterial property and the air permeability of the antibacterial nonwoven material are both more easily taken into consideration, and the antibacterial nonwoven material with both higher antibacterial property and air permeability than those in the prior art can be obtained.

The electret master batch has the function of adsorbing charges, and when the antibacterial non-woven material is added, microorganisms or droplets such as viruses or bacteria with charges are easily adsorbed and filtered out, so that the shielding effect of the protective non-woven material such as a mask and protective clothing is enhanced.

When polypropylene is melt-processed, the initiator A can be thermally degraded to generate free radicals, and the free radicals can abstract hydrogen from a polypropylene molecular chain to break a polypropylene polymer chain, so that the polypropylene is degraded and controlled to obtain polypropylene with narrow molecular weight, strong fluidity and unaffected other performances, and the melt index in the polypropylene reaction process is improved, so that the raw materials such as polypropylene and a bacteriostatic agent in the scheme are melt-blended more uniformly, and the bacteriostatic agent is dispersed in a bacteriostatic non-woven material more uniformly. Meanwhile, polypropylene with higher fluidity is more convenient for nonwoven processing. In addition, the initiator A has no defect of easy odor generation in the use process of the initiator such as dicumyl peroxide and the like, is applied to the non-woven material, and is not easy to generate odor in the production process, so that the product has little odor, and the safety and the use comfort are higher when the initiator A is used as the non-woven material which is directly contacted with the mouth and nose of a human body, such as a mask.

The polypropylene is heated and melted in the process of processing the polypropylene into a non-woven material, the material is easy to degrade, peroxidation free radicals are generated, excessive free radicals exist in the material due to the thermal degradation effect of the initiator A, and oxidation reaction of the polypropylene is caused, so that the color, physical properties, mechanical processing performance and the like of the processed material are affected.

The nucleating agent can accelerate the crystallization rate of polypropylene, increase the crystallization density and promote the grain size to be micronized, thereby being beneficial to increasing the density of the antibacterial non-woven material and improving the coverage of the antibacterial agent in the non-woven material, thereby playing the role of enhancing the antibacterial performance of the non-woven material.

Further, the antibacterial agent is one of a silver ion antibacterial agent or a zinc ion antibacterial agent.

By adopting the technical scheme, the silver ion antibacterial agent or the zinc ion antibacterial agent has the effects of wide antibacterial spectrum and long effective antibacterial period, and can adapt to the characteristic of long shelf life of a non-woven material when being added into the non-woven material, so that the non-woven material can have the function of long-acting bacteriostasis. In addition, compared with other antibacterial agents, the silver ion antibacterial agent and the zinc ion antibacterial agent have an oxidation effect, can effectively sterilize and disinfect, and silver and zinc are trace elements required in a human body, and are harmless to the human body when properly taken, so that the silver ion antibacterial agent and the zinc ion antibacterial agent are suitable for being used as antibacterial agents of nonwoven materials which are in direct contact with the human body.

Further, the nucleating agent adopts one of an organic phosphate nucleating agent or a rosin salt nucleating agent.

By adopting the technical scheme, the organic phosphate nucleating agent and the rosin salt nucleating agent can effectively improve the crystallization rate of polypropylene, and simultaneously have the characteristics of no peculiar smell and no toxicity under the high-temperature condition, and the safety performance of the non-woven material can be improved when the organic phosphate nucleating agent and the rosin salt nucleating agent are used in the non-woven material directly contacted with human skin.

Further, the antioxidant is phosphite antioxidant.

By adopting the technical scheme, phosphite antioxidants can react with oxides or residual oxides such as an initiator A in the processing process of the non-woven material to generate colorless aryl phosphate, so that the finally produced product is not easy to yellow in color and has good color, and when the phosphite antioxidants are used as the non-woven material in direct contact with human skin, the visual and psychological feelings of people are better.

Further, the raw materials of the antibacterial non-woven material also comprise LMPP, and the dosage of the LMPP is 10-20 parts by weight.

By adopting the technical scheme, the LMPP is a polypropylene material with low modulus, low molecular weight and narrow molecular weight distribution, has the characteristics of high transparency and good softness similar to amorphous PP, and has the advantages of good fluidity and good spinnability of the PP for conventional spunbonding. In polypropylene production, LMPP is produced as a by-product, and LMPP is also produced by the company Idemitsu Kosan, japan, using a special C2 symmetric metallocene composite catalyst system. The LMPP has good compatibility with polypropylene, and PP fibers with better spinnability, finer fibers and more fibers can be obtained by using the PP/LMPP mixture, so that the nonwoven material has high strength and high flexibility. In addition, due to the low isotacticity component LMPP, PP crystallization is slowed down, the PP is more easily and fully drawn, the solidification position of spinning is moved downstream, neck deformation can be restrained, and the spinnability of the nonwoven material is improved. Meanwhile, LMPP is added to enter a crystal phase of polypropylene, so that the range of an amorphous phase area of the non-woven material is increased, slow diffusion of the bacteriostatic agent to the surface of the filaments through the amorphous phase area of the non-woven material is facilitated, and the bacteriostatic effect of the non-woven material is enhanced.

In order to achieve the second object, the present invention provides the following technical solutions:

a method for preparing a bacteriostatic non-woven material, which comprises the following steps:

s1, mixing materials

Uniformly stirring and mixing the polypropylene and the nucleating agent in parts by weight to obtain a mixture;

s2, melt extrusion

Adding the initiator A, LMPP, the antibacterial agent, the antioxidant and the mixture in the step S1 in parts by weight into a screw extruder through different metering feeding devices, and performing melt extrusion granulation to obtain a semi-finished antibacterial non-woven material, wherein the processing temperature of the screw extruder is set between 160 ℃ and 220 ℃, and the screw rotating speed is 200-300rpm;

s3, mixing and homogenizing

And (3) mixing and homogenizing the electret master batch and the semi-finished antibacterial non-woven material obtained in the step (S2) to obtain a finished antibacterial non-woven material.

By adopting the technical scheme, the polypropylene and the nucleating agent are uniformly mixed at first, so that the polypropylene can be uniformly and effectively crystallized in the follow-up process. In the granulating process, the initiator A, LMPP, the antibacterial agent, the antioxidant and the mixture of the polypropylene and the nucleating agent are respectively added into the screw extruder by using different metering and feeding devices, so that required raw materials can be continuously and slowly added into the screw extruder, the raw materials are convenient to mix, and the conditions of insufficient mixing and melting among the raw materials and reduced product quality caused by adding all the raw materials in parts by weight at one time are reduced. Finally, the physical method of mixing homogenization is utilized to mix the electret master batch with the nonwoven material obtained by pelletization, so that the polarity of the electret master batch can be effectively maintained.

Further, the screw extruder described in S2 employs a twin screw extruder having 13 warming zones, and the antioxidant is added at the 10 th warming zone.

By adopting the technical scheme, the antioxidant reaction of the antioxidant is a process of eliminating free radicals, so that the addition of the antioxidant tends to consume the free radicals generated by the initiator A, the degradation of polypropylene is slowed down, and further the melt index of the polypropylene fluctuates. In the melting process of the non-woven material, the melt fingers continuously rise, the 10 th heating section is close to the main heating section of the double-screw extruder, and the existing raw materials in the reaction system are basically thoroughly melted at the moment, and the whole melt fingers are relatively high, so that the addition of the antioxidant does not easily cause too great influence on the melt degradation of polypropylene in the reaction system, thereby not easily causing too great influence on the processability and the quality of a finished product of the non-woven material, simultaneously reducing the dosage of the antioxidant of the initiator A and saving the production economic cost. On the other hand, the antioxidant is added in the 10 th heating section, so that the sufficient melting time of the antioxidant can be shortened, and the situation that the antioxidant cannot be melted thoroughly is reduced. Meanwhile, the inventor finds that the oxidation loss of the product is minimum by adding the antioxidant in the 10 th zone through a thermogravimetric analysis (TGA) experiment under the oxygen atmosphere, and shows that the oxidation resistance of the product prepared by adding the antioxidant in the 10 th zone is better.

In summary, the invention has the following beneficial effects:

firstly, because the polypropylene, the initiator A, the antioxidant, the antibacterial agent, the electret master batch and the nucleating agent are adopted to be melt-blended, and then the antibacterial non-woven material is processed by a non-woven technology, the antibacterial agent and other raw materials of the non-woven material jointly form a fibrous body of the non-woven material, the possibility of falling off between the antibacterial agent and the material is reduced, and a long-acting and lasting antibacterial effect can be obtained.

Secondly, the silver ion antibacterial agent or the zinc ion antibacterial agent is preferably adopted in the invention, and the silver ion antibacterial agent and the zinc ion antibacterial agent have strong sterilization and disinfection effects, belong to trace elements required by human bodies, and are harmless to the human bodies when taken in a small amount, so that the antibacterial non-woven material in the scheme can not only obtain effective antibacterial effects, but also is not easy to cause harm to users.

Thirdly, the raw materials in the invention also contain LMPP, which can obtain fibers with higher spinnability and toughness, compared with nonwoven materials without LMPP, the fiber quantity in the nonwoven materials with the same volume in the scheme is more, the integral strength and toughness of the antibacterial nonwoven materials are increased, and the use value of the antibacterial nonwoven materials is higher.

Fourth, in the method of the invention, on one hand, the required raw materials are respectively added into the double-screw extruder through different metering and feeding devices, so that the addition amount of all the raw materials is more accurately controlled, and on the other hand, the antioxidant is added from the 10 th area, so that the interference degree of the antioxidant on the melt fingers of the production system is reduced, and the uniformity of the melt mixing of all the raw materials is respectively enhanced from the two aspects, so that the effects of improving the processability of the spinning material and the quality of the finished product are achieved.

Drawings

FIG. 1 is an SEM image of a bacteriostatic nonwoven material article according to example 1;

FIG. 2 is an SEM image of a bacteriostatic nonwoven material article according to comparative example 2;

FIG. 3 is the results of a bacteriostasis test of a bacteriostasis nonwoven material article prepared in example 1 in a bacteriostasis test experiment;

FIG. 4 is the results of a bacteriostasis test of a bacteriostasis nonwoven product prepared in example 2 in a bacteriostasis test experiment;

FIG. 5 is the results of a bacteriostasis test of a bacteriostasis nonwoven product prepared in example 3 in a bacteriostasis test experiment;

FIG. 6 is a bacteriostasis test result of the bacteriostasis nonwoven material product prepared in comparative example 1 in a bacteriostasis test experiment;

FIG. 7 is a graph of the TGA test results of comparative example 5;

FIG. 8 is a graph of the TGA test results of comparative example 3;

FIG. 9 is a graph of the TGA test results of comparative example 4;

FIG. 10 is a graph of the TGA test results of example 1.

Detailed Description

The invention is described in further detail below with reference to the drawings and examples.

Example 1:

an antibacterial nonwoven material is prepared from the following raw materials in parts by weight:

80 parts of polypropylene

Initiator A0.5 part

Antioxidant 0.1 part

1 part of antibacterial agent

3 parts of electret master batch

0.1 part of nucleating agent

LMPP10 parts

Among them, polypropylene is a commercially available product.

The initiator A is a commercial product, and other initiators capable of initiating free radicals can be selected.

The antioxidant is a commercial product, here phosphite antioxidants, weston 618.

The antimicrobial agent is a commercially available product, here silver ion antimicrobial agent, zeomic DAW502.

The electret master batch is a commercial product.

The nucleating agent is a commercially available product, here an organic phosphate type nucleating agent, NA-21.

LMPP is a commercially available product.

The embodiment also provides a preparation method of the antibacterial nonwoven material, which comprises the following steps:

s1, mixing materials

Uniformly stirring and mixing the polypropylene and the nucleating agent in parts by weight in the embodiment to obtain a mixture;

s2, melt extrusion

The initiator A, LMPP, the antibacterial agent and the mixture in S1 in the present example were added to the twin-screw extruder by different flow metering pumps, respectively, and the antioxidant was added to the 10 th heating section of the twin-screw extruder by weight loss. The twin-screw extruder has 13 heating sections, and the length-diameter ratio of the screw is 56:1. All the raw materials are melted and extruded from a double-screw extruder, cut and granulated underwater, cooled and then the antibacterial non-woven material semi-finished product is obtained. In the step, the processing temperatures of 13 heating sections of the double-screw extruder are sequentially set from the 1 st zone to the 13 th zone as follows: 160 ℃, 180 ℃, 200 ℃, 220 ℃, 215 ℃, 210 ℃, 180 ℃, 170, 180 ℃, and the twin-screw rotation speed is 250rpm;

s3, mixing and homogenizing

Mixing and homogenizing the electret master batch and the antibacterial non-woven material semi-finished product obtained in the step S2 by using a mixer to obtain antibacterial non-woven material master batch;

s4, melt-blowing and molding

And (3) adopting HD-SM100 medium-sized spunbonding-melt-blowing integrated equipment, wherein the breadth is 0.25 and m, and melt-blowing the antibacterial nonwoven master batch obtained in the step (S3) by a melt-blowing method to manufacture the antibacterial nonwoven product. The melt-blowing process is set as follows: the extrusion temperature is 215 ℃, the extrusion amount is 150ml/min, the drafting air temperature is 45 ℃, the under-net air suction is 4500Pa, the net curtain transmission speed is 5m/min, the pre-pressing roller temperature is 5O ℃, the hot-pressing roller temperature is 120 ℃, and the hot-pressing roller pressure is 1200 kgf.

Fig. 1 is an SEM image of the bacteriostatic nonwoven material product produced in this example, and it can be seen from the figure that the fibers in the nonwoven material are in a dense three-dimensional network structure, the fibers are intertwined with each other, the fiber thickness is unevenly distributed, and gaps for ventilation exist in the web.

Example 2:

the embodiment is different from the embodiment 1 in that a bacteriostatic nonwoven material is prepared from the following raw materials in parts by weight:

polypropylene 100 parts

Initiator A1 part

Antioxidant 1 part

2 parts of antibacterial agent

6 parts of electret master batch

1 part of nucleating agent

LMPP 15 parts

The antioxidant is a commercial product, here phosphite antioxidant, irgafos 168.

The antimicrobial agent is a commercially available product, here a zinc ion antimicrobial agent, japanese Ji Fu ZPT.

The nucleating agent is a commercial product, namely a rosin acid salt nucleating agent, zhejiang wan an plastic and a rosin type polyolefin transparent nucleating agent.

With the raw materials in parts by weight in this example, a bacteriostatic nonwoven material was prepared using the preparation method in example 1.

Example 3:

120 parts of polypropylene

Initiator A2 parts

Antioxidant 2 parts

3 parts of antibacterial agent

10 parts of electret master batch

2 parts of nucleating agent

LMPP 20 parts

The antimicrobial agent is a commercially available product, here zinc ion antimicrobial agent, us aoqi, zinc Omadie Powder.

Comparative example 1:

this comparative example differs from example 1 in that no antibacterial agent was added.

Comparative example 2:

this comparative example differs from example 1 in that no LMPP was added.

Fig. 2 is an SEM image of the bacteriostatic nonwoven material product produced in this comparative example, and it can be seen from comparison with fig. 1 that the fibers in the nonwoven material have a three-dimensional network structure, but the number of fibers is small, the fine fibers are almost absent, the intertwining nodes between the fibers are also significantly reduced, and the fiber web is significantly thinner than that of fig. 1. It follows that the dense nonwoven material of the web can exhibit higher strength and higher flexibility after the addition of LMPP.

Comparative example 3:

this comparative example differs from example 1 in that the antioxidant is added in the 3 rd heating zone of the twin screw extruder.

Comparative example 4:

this comparative example differs from example 1 in that the antioxidant is added in the 6 th warming section of the twin-screw extruder.

Comparative example 5:

this comparative example differs from example 1 in that the antioxidant is added at the throat of the twin screw extruder (i.e., the 1 st warming zone).

Performance test

Bacteriostasis test experiment:

s1: manufacturing culture dish

A disposable sterile culture dish with the thickness of 25 mm x 100 mm is selected, the sterilized agar culture medium is poured into the culture dishes in an ultra-clean workbench, 10ml of agar culture medium is poured into each culture dish, and the agar culture medium completely covers the bottom of the culture dish;

s2: inoculation of

After the agar culture medium in the culture dish is completely solidified and cooled to room temperature, the nonwoven material products produced in the example 1, the example 2, the example 3 and the comparative example 1 are respectively cut into square pieces of 5cm x5cm in an ultra-clean workbench, and each piece of the square pieces is taken as a sample for the bacteriostasis test, and is singly put into the culture dish containing the agar culture medium prepared in the S1, 3 repeats are carried out on the sample of the example 1, the sample of the example 2 and the sample of the example 3, and 2 repeats are carried out on the sample of the comparative example 1; will have a concentration of 6.29x10 ⁵ The mixed spore suspension of Aspergillus niger, penicillium, ball Mao Baijiang bacteria, coliform bacteria and staphylococcus aureus in each dish is inoculated onto the sample in each dish, the mixed spore suspension is uniformly coated on each dish for 15ul, and after inoculation, the dish is sealed by a sealing film；

S3: incubation

After culturing the inoculated dishes in S2 in a constant temperature incubator at 37℃and a relative humidity of 90% for 48 hours, the growth of microorganisms on each dish of samples was observed.

The experimental results are shown in fig. 3, 4, 5 and 6, wherein fig. 3 is the antibacterial test experimental result of example 1, fig. 4 is the antibacterial test experimental result of example 2, fig. 5 is the antibacterial test experimental result of example 3, and fig. 6 is the antibacterial test experimental result of comparative example 1.

As can be seen from the results in fig. 3 to 6, first, no macroscopic microorganisms grow on the samples in the dishes to which the silver-ion antimicrobial agent Zeomic DAW502 was added in fig. 3, and macroscopic microorganisms grow on the samples in the dishes of fig. 4, 5 and 6, indicating that the nonwoven material to which the silver-ion antimicrobial agent Zeomic DAW502 was added in example 1 had superior antimicrobial properties to the nonwoven material to which the zinc-ion antimicrobial agent was added.

Next, fig. 4 shows that the coverage of microorganisms on the samples in the dishes in fig. 5 is equivalent, and illustrates that the antibacterial effect of the two zinc ion antibacterial agents selected in the present invention is equivalent, whereas the samples in the dishes in fig. 6 are full of microorganisms, and as can be seen from fig. 3, the nonwoven material added with the antibacterial agent in the present invention has a good antibacterial effect.

Tensile strength test experiment:

the antibacterial nonwoven material products in example 1, example 2, example 3 and comparative example 2 were used as test samples, and 50mm x50mm samples were subjected to transverse (CD) and longitudinal (MD) stretching by a DR028-3000 universal material tester according to the national standard GB/T3923.1-2013 "first part of textile fabric stretching properties", and the test results are shown in table 1 below.

Table 1: tensile Strength test results

As can be seen from table 1 above, the transversal tensile strength and the longitudinal tensile strength of the bacteriostatic nonwoven material article gradually increased with increasing amounts of polypropylene and LMPP, but from the results of example 1, example 2 and example 3, it can be seen that the increase in the transversal tensile strength and the longitudinal tensile strength of the article gradually decreased with increasing amounts of polypropylene and LMPP. In addition, as can be seen from the data of example 1 and comparative example 2 in the above table, the transverse tensile strength and the longitudinal tensile strength of the product are significantly improved after the LMPP is added.

Melt finger test experiment:

nonwoven material master batches produced in example 1, example 2, example 3, comparative example 4 and comparative example 5 were selected as test samples for this melt index test experiment, and melt index of each test sample was measured using a JFRZY-0010 polypropylene melt-blown material dedicated melt flow rate meter, respectively, and the measurement results are shown in table 2 below.

Table 2: melt finger test results

As is clear from Table 2 above, the melt index of the nonwoven material masterbatch increases gradually with increasing amounts of polypropylene, initiator A and antioxidant, but the magnitude of the increase in melt index decreases gradually, so that in order to achieve the effect that the melt index of the nonwoven material masterbatch is at a higher level and the material is saved, the polypropylene in the present invention is preferably 80 to 120 parts, initiator A is preferably 0.5 to 2 parts, and antioxidant is preferably 0.1 to 2 parts.

Further, as can be seen from table 2 above, the closer the heated zone to which the antioxidant is added is to the feed opening, the lower the melt index of the product is, and the lower the melt index of the nonwoven material masterbatch is, and when a nonwoven material product is subsequently produced by melt-blowing using the masterbatch, the worse the masterbatch flowability is, and the more unfavorable the melt-blowing process is, and therefore, in order to improve the melt-blowing functional performance of the nonwoven material masterbatch, the antioxidant is preferably added to the 10 th heated zone in the present invention.

Thermogravimetric analysis Test (TGA)

The nonwoven material master batches produced in example 1, example 2, example 3, comparative example 4 and comparative example 5 were respectively selected as test pieces, and the oxidation stability of the materials was tested by increasing the temperature of the test pieces under an oxygen atmosphere using a thermogravimetric analyzer and observing the continuous change of the weight of the test pieces with increasing temperature under an oxygen atmosphere. The thermogravimetric curves are shown in fig. 7 to 10, wherein fig. 7 is a TGA test result graph of comparative example 5, fig. 8 is a TGA test result graph of comparative example 3, fig. 9 is a TGA test result graph of comparative example 4, fig. 10 is a TGA test result graph of example 1, and the characteristic values of the thermogravimetric curves corresponding to fig. 7 to 10 are summarized in table 3 below.

Table 3: thermogravimetric analysis test results

Antioxidant adding position	230 ℃ thermal weight loss (%)	240 ℃ thermal weight loss (%)	Thermal weight loss at 250 ℃ (%)	Thermal weight loss at 300 ℃ (%)
					Comparative example 5	15.499	19.574	24.502	81.227
Comparative example 3	5.140	11.613	15.516	37.182
					Comparative example 4	3.722	6.783	8.630	30.586
Example 1	0.626	1.894	3.285	21.696

From the thermal weight loss curves of fig. 7-10 and the data in table 3, it can be seen that, from the feed opening to the 10 th heating section, as the heat loss of the product in the oxygen atmosphere is smaller with the subsequent addition of the antioxidant to the 10 th heating section, the heat loss of the antibacterial nonwoven material prepared by adding the antioxidant to the 10 th heating section in the oxygen atmosphere is minimum, which indicates that the thermal oxidation stability of the antibacterial nonwoven material prepared by adding the antioxidant to the 10 th heating section is highest, therefore, it can be indicated that the antibacterial nonwoven material with stable and excellent oxidation resistance can be prepared by adding the antioxidant to the 10 th heating section.

The present embodiment is only for explanation of the present invention and is not to be construed as limiting the present invention, and modifications to the present embodiment, which may not creatively contribute to the present invention as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present invention.

Claims

1.The antibacterial non-woven material is characterized by being prepared from the following raw materials in parts by weight: 80 to 120 parts of polypropylene, 0.5 to 2 parts of initiator A, 0.1 to 2 parts of antioxidant, 1 to 3 parts of antibacterial agent, 3 to 10 parts of electret master batch, 0.1 to 2 parts of nucleating agent, and 10 to 20 parts of LMPP;

the antibacterial agent is one of silver ion antibacterial agent or zinc ion antibacterial agent;

the nucleating agent adopts one of an organic phosphate nucleating agent or a rosin salt nucleating agent;

the antioxidant is phosphite antioxidant;

the antibacterial non-woven material also comprises LMPP, wherein the dosage of the LMPP is 10-20 parts by weight.

2. A method of preparing a bacteriostatic nonwoven material according to claim 1, characterized by the steps of:

s1, mixing materials

Uniformly stirring and mixing the polypropylene and the nucleating agent in parts by weight to obtain a mixture;

s2, melt extrusion

The mixture of the initiator A, LMPP, the antibacterial agent, the antioxidant and the S1 in parts by weight is metered in different amounts respectively Adding the material device into a screw extruder, and performing melt extrusion granulation to obtain a semi-finished antibacterial non-woven material, wherein the processing temperature of the screw extruder is the same as that of the semi-finished antibacterial non-woven material Setting the temperature between 160 ℃ and 220 ℃ and the rotating speed of the screw rod between 200 rpm and 300rpm;

s3, mixing and homogenizing

Mixing and homogenizing the electret master batch and the antibacterial non-woven material semi-finished product obtained in the step S2 to obtain antibacterial non-woven material master batch;

s4, melt-blowing and molding

Melt-blowing the antibacterial nonwoven master batch obtained in the step S3 to manufacture antibacterial nonwoven products;

described in S2The screw extruder of (2) adopts a double screw extruder with 13 heating sections, and 13 double screw extruders are used for heating The processing temperature of the temperature section is set as follows from zone 1 to zone 13: 160 ℃, 180 ℃, 200 ℃, 220 ℃, 215 The antioxidant is added in the 10 th heating section at the temperature of 215 ℃, 210 ℃, 180 ℃, 170 ℃ and 180 ℃.