TW202300738A - Antiviral polypropylene non-woven fabric and preparation method thereof - Google Patents

Abstract

The present invention discloses an antiviral polypropylene non-woven fabric and a preparation method thereof. The polypropylene non-woven fabric is prepared from a polypropylene antibacterial master batch and polypropylene as raw materials, in which a silver-cerium zeolite material is loaded in the polypropylene antibacterial master batch. The preparation method of the polypropylene nonwoven fabric comprises the following steps: (1) taking a NaY-type zeolite-loaded silver ions and cerium ions to obtain a silver-cerium zeolite material; (2) heating polypropylene to melting, and then adding the silver-cerium zeolite material, stirring, blending and granulating to obtain a polypropylene antibacterial master batch; (3) after uniformly mixing the polypropylene antibacterial master batch and polypropylene, melting, filtering, spinning to form a web, and finally ironing by a high-temperature roller to make an antiviral polypropylene non-woven fabric. The antiviral polypropylene non-woven fabric provided by the present invention adopts the silver-cerium zeolite material as the antiviral agent. It has the advantages of the antibacterial properties of silver-based inorganic antibacterial and antiviral agents and rare earth materials, and combines the excellent adsorption properties of zeolite to synergistically improve the antiviral properties of non-woven fabrics.

Description

A kind of antiviral polypropylene non-woven fabric and preparation method thereof

The invention relates to a polypropylene nonwoven fabric and a preparation method thereof.

Non-woven fabrics have the characteristics of moisture-proof, breathable, flexible, light weight, flame-retardant, non-toxic and tasteless, low price, and recyclable. At present, the demand for non-woven fabrics in the medical and public health fields is gradually increasing, and higher requirements are put forward for the antibacterial and antiviral properties of non-woven fabrics.

At present, the methods for antibacterial and antiviral treatment of non-woven fabrics are mainly divided into two categories: one is to load antibacterial and antiviral agents into textile fibers, and the other is to pass the prepared non-woven fabrics through subsequent chemical Modification or physical impregnation process, which absorbs or grafts antibacterial and antiviral agents on the surface of non-woven fabrics.

Antibacterial and antiviral agents can be mainly divided into three categories: natural, organic synthesis and inorganic according to the different components. Natural antibacterial and antiviral agents have poor heat resistance and short drug efficacy, and have not yet achieved large-scale production. Organically synthesized small molecule antibacterial and antiviral agents have poor thermal stability and low processing temperature (less than 200 degrees), so their applications are greatly limited. Among the inorganic antibacterial and antiviral agents, nano-silver or silver-loaded materials have the highest antiviral performance. However, the preparation process of nano-silver is complicated, the stability is poor, and the cost of silver-loaded materials is high, so it is difficult to popularize the application in non-woven fabrics.

In view of the above problems, it is necessary to design an anti-virus non-woven fabric with strong anti-virus ability but low cost.

An object of the present invention is to provide an antiviral polypropylene non-woven fabric with strong antiviral ability but low cost and simple process.

The present invention achieves the purpose of the above invention through the following technical solutions: an antiviral polypropylene non-woven fabric prepared from polypropylene antibacterial masterbatch and polypropylene as raw materials, wherein the polypropylene antibacterial masterbatch is loaded with silver-cerium zeolite Material.

The total loading of silver-cerium zeolite material in the polypropylene antibacterial masterbatch is 20-30wt%.

The mass ratio of the polypropylene antibacterial masterbatch to polypropylene is 3-5%:95-97%.

Another object of the present invention is to provide a method for preparing antiviral polypropylene nonwoven fabric.

Specifically, the preparation method of the antiviral polypropylene nonwoven fabric comprises the following steps:

(1) Preparation of silver-cerium zeolite material: take NaY-type zeolite loaded with silver ions and cerium ions to obtain silver-cerium zeolite material.

(2) Preparation of polypropylene antibacterial masterbatch: take polypropylene and heat to melt, add silver-cerium zeolite material, stir, blend and granulate to obtain polypropylene antibacterial masterbatch.

(3) Preparation of anti-viral polypropylene non-woven fabric: after uniform mixing of polypropylene anti-bacterial masterbatch and polypropylene, melting, filtration, spinning into a web, and finally ironing by high-temperature rollers to make anti-viral polypropylene non-woven fabric .

As some embodiments of the present invention, in the step (1), NaY type zeolite is baked at 280-300 degrees for 3-5 hours, dispersed in the mixed solution of silver nitrate and cerium nitrate, and stirred in the dark for 1.5-2.5 Hours, washing, drying, calcining, cooling and grinding to obtain silver-cerium zeolite material.

The baking temperature is 400-500 degrees, and the baking time is 1-2 hours.

In the mixed solution of silver nitrate and cerium nitrate, the concentration of silver nitrate is 20-30g/L, and the concentration of cerium nitrate is 25-35g/L.

The beneficial effects of the present invention are:

1. The antiviral polypropylene (PP) non-woven fabric provided by the present invention adopts silver-cerium zeolite material as antiviral agent, and it is made of polypropylene antibacterial masterbatch with PP powder earlier, and then mixed with polypropylene for spinning Prepared, the invention combines the antibacterial performance of silver ions and rare earth ions, and further combines the excellent adsorption performance of zeolite to synergistically improve the antiviral performance of the nonwoven fabric.

Regarding the releasable free silver ions of the non-woven fabric provided by the present invention, according to the Fenton reaction mechanism, free silver ions can be combined with specific sites of biomacromolecules such as proteins and nucleic acids to form complexes, and there are dissolved oxygen and water in the solution. Under certain conditions, this complex can undergo continuous cyclic redox reactions, and a large number of hydroxyl radicals can be generated near biomacromolecules. Hydroxyl free radicals have strong oxidizing properties and have a strong destructive effect on the structure of biological macromolecules, which can inactivate microorganisms such as viruses. Silver ions can chemically bond with the oxygen atoms on the phosphate groups in viral nucleotides, creating a dipole moment on the phosphate groups, inducing a cyclic phosphate, in this case, linking two adjacent nucleotides The phosphodiester bond of the virus is broken, which breaks the nucleic acid chain of the virus and affects the replication of the genetic information of the virus; for DNA viruses, silver ions can form purine/silver/pyrimidine chemical bonds in the DNA double helix structure, which can replace the adjacent The hydrogen bond between purine and pyrimidine forms a more stable helical structure, which hinders the unwinding of DNA and makes it difficult for the virus to reproduce effectively; if the protein on the surface of the virus contains a sulfhydryl group, silver ions can irreversibly bind to the sulfhydryl group, resulting in Protein denaturation and inactivation.

The non-woven fabric provided by the invention can also release rare earth cerium ions, which can interact with cell walls and cells Cell membrane, enzyme, protein, DNA and RNA function, inhibit the growth of microorganisms. Rare earth ions have a radius similar to calcium ions, and their ability to complex oxygen, sulfur, and nitrogen is greater than calcium ions, so they can be excellent antagonists of calcium ions. The addition of rare earth ions changed the permeability of the microbial cell membrane and also inhibited the growth of microorganisms.

The present invention adopts the combined use of silver ions and rare earth ions. When the light containing ultraviolet rays is irradiated on the non-woven fabric, due to the existence of valence electrons in the outer layer, electrons and holes are generated, and most of the electrons are carried by the valence electrons in the outer layer of rare earth elements. Capture, the electron-hole concentration generated is much higher than that of the rare earth element; at the same time, some electrons that transition to the valence band of rare earth elements are also easily captured by silver atoms to form silver negative ions. Due to the above two activation effects, further Strengthen the anti-virus performance of non-woven fabrics.

2. The present invention adopts NaY type zeolite as the carrier, through the ion exchange method, can carry out the double loading of silver ion and cerium ion, the silver-cerium zeolite material of preparation can be used as antiviral active element, the microporous channel structure of zeolite can effectively effectively immobilizes metal ions and combines with silver ions and cerium ions. In addition, the surface and interior of nonwoven fibers are modified and loaded, so that the prepared nonwovens have efficient and durable antiviral function.

The present invention will be further described in detail below in conjunction with the examples. It should be noted that the following examples are intended to facilitate the understanding of the present invention, but do not limit it in any way.

Embodiment one

(1) Preparation of silver-cerium zeolite material: After baking 200-mesh NaY zeolite at 280 degrees for 5 hours, disperse it in a mixed solution of 25g/L silver nitrate and 30g/L cerium nitrate (solution pH=5), avoid light and stir 2 hours, washed and dried at 450 degrees, calcined for 1 hour, cooled and ground to obtain 1250 Purpose Silver-cerium zeolite material.

(2) Preparation of polypropylene antibacterial masterbatch: heat polypropylene to 200 degrees, polypropylene is melted, and then silver-cerium zeolite material is added to the melt, and the addition amount is 25wt% of the polypropylene mass, that is, the loading capacity is 25wt %, followed by stirring, blending, and granulation to obtain a polypropylene antibacterial masterbatch.

(3) Preparation of antiviral polypropylene non-woven fabric: After uniformly mixing polypropylene antibacterial masterbatch and polypropylene at a mass ratio of 5%:95%, extrusion and melting are carried out to obtain a melt, which is filtered to remove impurities, spun The wire is formed into a web, and finally it is ironed by a high-temperature pressing roller to make an anti-virus PP non-woven fabric.

The antiviral activity of the non-woven fabric produced by Guangdong Microbiological Analysis and Testing Center was tested according to ISO 18184:2019(E). The antiviral activity rate against influenza A H3N2 reached 98.3%, and the antiviral activity rate against human coronavirus reached 97.1%, which proves that the non-woven fabric made has good anti-virus performance and can meet the demand for non-woven fabrics in the medical and public health fields.

Table 1: Results of antiviral PP nonwoven fabric against influenza A virus H3N2

Table 2: Results of antiviral PP nonwoven fabric against human coronavirus HCoV-229E

Embodiment two

The difference from Example 1 is that the mass ratio of polypropylene antibacterial masterbatch to polypropylene is 3%:97%. The antiviral effect of the nonwoven fabric is comparable to that of Example 1.

Embodiment three

The difference from Example 1 is that in the mixed solution of silver nitrate and cerium nitrate, the concentration of silver nitrate is 25.5 g/L, and the concentration of cerium nitrate is 30.5 g/L of cerium nitrate. The antiviral effect of the nonwoven fabric is comparable to that of Example 1.

Embodiment Four

The difference from Example 1 is that in the mixed solution of silver nitrate and cerium nitrate, the concentration of silver nitrate is 26g/L, and the concentration of cerium nitrate is 31g/L of cerium nitrate. The antiviral effect of the nonwoven fabric is comparable to that of Example 1.

Embodiment five

(1) Preparation of silver-cerium zeolite material: 200 mesh NaY type zeolite is baked at 300 degrees for 3 After 1 hour, disperse in 25g/L silver nitrate and 30g/L cerium nitrate mixed solution (solution pH=5), avoid light and stir for 2 hours, then wash, dry at 450 degrees, calcined for 1 hour, cool and grind to obtain 12050 mesh silver Cerium zeolite material.

(2) Prepare polypropylene antibacterial masterbatch: heat polypropylene to 220 degrees, melt polypropylene, then add silver-cerium zeolite material in the melt, the addition is 20wt% of polypropylene mass, that is, the loading capacity is 20wt%, followed by stirring, blending, and granulation to obtain a polypropylene antibacterial masterbatch.

(3) Preparation of antiviral polypropylene non-woven fabric: uniformly mix polypropylene antibacterial masterbatch and polypropylene at a mass ratio of 5%:95%, then extrude and melt to obtain a melt. The melt is filtered to remove impurities, spun into a web, and finally ironed by a high-temperature pressure roller to make an anti-virus PP non-woven fabric.

The antiviral effect of the nonwoven fabric is equivalent to that of Example 1.

Embodiment six

The difference from Example 6 is that the mass ratio of polypropylene antibacterial masterbatch to polypropylene is 4%:96%. The antiviral effect of the nonwoven fabric is equivalent to that of Example 1.

Embodiment seven

It differs from Example 6 in that: in the mixed solution of silver nitrate and cerium nitrate, the concentration of silver nitrate is 24.5 g/L, and the concentration of cerium nitrate is 29.5 g/L of cerium nitrate. The antiviral effect of the nonwoven fabric is equivalent to that of Example 1.

Embodiment Eight

The difference from Example 6 is that in the mixed solution of silver nitrate and cerium nitrate, the concentration of silver nitrate is 24g/L, and the concentration of cerium nitrate is 29g/L of cerium nitrate. The anti-virus effect of the non-woven fabric Result is equivalent to embodiment one.

Embodiment nine

(1) Preparation of silver-cerium zeolite material: After baking 200-mesh NaY zeolite at 280 degrees for 3 hours, disperse in a mixed solution of 25g/L silver nitrate and 30g/L cerium nitrate (solution pH=5), avoid light and stir 2 hours, then washed, dried at 450°C, calcined for 1 hour, cooled and then ground to obtain a 12050-mesh silver-cerium zeolite material.

(2) Prepare polypropylene antibacterial masterbatch: heat polypropylene to 210 degrees, melt polypropylene, then add silver-cerium zeolite material in the melt, the addition is 30wt% of polypropylene mass, that is, the loading capacity is 30wt%, followed by stirring, blending, and granulation to obtain a polypropylene antibacterial masterbatch.

(3) Preparation of antiviral polypropylene non-woven fabric: uniformly mix polypropylene antibacterial masterbatch and polypropylene at a mass ratio of 5%:95%, then extrude and melt to obtain a melt. The melt is filtered to remove impurities, spun into a web, and finally ironed by a high-temperature pressure roller to make an anti-virus PP non-woven fabric.

The antiviral effect of the nonwoven fabric is equivalent to that of Example 1.

Embodiment ten

It is different from Example 9 in that: in the mixed solution of silver nitrate and cerium nitrate, the concentration of silver nitrate is 24.5g/L, and the concentration of cerium nitrate is 29.5g/L of cerium nitrate. The antiviral effect of the nonwoven fabric is equivalent to that of Example 1.

Embodiment Eleven

It is different from Example 9 in that: in the mixed solution of silver nitrate and cerium nitrate, the concentration of silver nitrate is 24g/L, and the concentration of cerium nitrate is 29g/L of cerium nitrate. The antiviral effect of the nonwoven fabric is equivalent to that of Example 1.

The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the present invention. Invention, although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or equivalently replaced without departing from the principle and scope of the technical solution of the present invention.

Claims (7)

An antiviral polypropylene nonwoven fabric is characterized in that the antiviral polypropylene nonwoven fabric is prepared from polypropylene antibacterial masterbatch and polypropylene, and the polypropylene antibacterial masterbatch is loaded with silver-cerium zeolite Material. The antiviral polypropylene nonwoven fabric according to claim 1, wherein the total amount of silver-cerium zeolite material in the polypropylene antibacterial masterbatch is 20-30wt%. The antiviral polypropylene nonwoven fabric according to claim 1, wherein the mass ratio of the polypropylene antibacterial masterbatch to polypropylene is 3-5%:95-97%. A method for preparing the antiviral polypropylene non-woven fabric as described in any one of claims 1 to 3, characterized in that the method comprises the following steps: (1) Preparation of silver-cerium zeolite material: take NaY-type zeolite loaded with silver ions and cerium ions to obtain silver-cerium zeolite material. (2) Preparation of polypropylene antibacterial masterbatch: take polypropylene and heat to melt, add silver-cerium zeolite material, stir, blend and granulate to obtain polypropylene antibacterial masterbatch. (3) Preparation of anti-viral polypropylene non-woven fabric: after uniform mixing of polypropylene anti-bacterial masterbatch and polypropylene, melting, filtration, spinning into a web, and finally ironing by high-temperature rollers to make anti-viral polypropylene non-woven fabric . The method for preparing antiviral polypropylene non-woven fabric as claimed in item 4 is characterized in that in step (1), the NaY type zeolite is baked at 280-300 degrees for 3-5 hours and dispersed in the mixed solution. Stir the silver nitrate and cerium nitrate in the dark for 1.5-2.5 hours, wash, dry, calcinate, cool and grind to obtain the silver-cerium zeolite material. The method for preparing antiviral polypropylene non-woven fabric as described in Claim 5 is characterized in that the baking temperature is 400-500 degrees, and the baking time is 1-2 hours. The preparation method of antiviral polypropylene non-woven fabric as described in claim item 5 is characterized in that, in the mixed solution of silver nitrate and cerium nitrate, the concentration of silver nitrate is 20-30g/L, and the concentration of cerium nitrate is 25-35g/L L.