CN113908324B

CN113908324B - Disposable hygienic product with antibacterial function

Info

Publication number: CN113908324B
Application number: CN202111127853.8A
Authority: CN
Inventors: 姜慧勇; 丁桂兴; 丁哲文
Original assignee: Hangzhou Shujie Hygiene Products Co ltd
Current assignee: Hangzhou Shujie Hygiene Products Co ltd
Priority date: 2021-09-26
Filing date: 2021-09-26
Publication date: 2022-05-17
Anticipated expiration: 2041-09-26
Also published as: CN113908324A

Abstract

The invention discloses a disposable sanitary article with a bacteriostatic function, which consists of a surface layer, a water absorbing layer and a bottom layer, wherein bonding layers are arranged between the surface layer and the water absorbing layer and between the water absorbing layer and the bottom layer; the adhesive layer is a hot melt adhesive with an antibacterial function, and CuAg alloy nano particles and/or micro-nano activated carbon are uniformly dispersed in the hot melt adhesive; the surface layer is made of hydrophilic non-woven fabric; the water absorption layer is a functional layer containing a high water absorption resin material; the bottom layer is a breathable protective bottom film layer covered with a leakage-blocking interlayer, the copper-silver alloy nano particles with triangular thorn shapes are synthesized under specific conditions by selecting a proper dispersing agent and a morphology regulating agent, the copper-silver alloy nano particles and the morphology regulating agent have more step atoms and higher active density through the synergistic effect of the copper-silver alloy nano particles and the morphology regulating agent, and the copper-silver alloy nano particles can be used as a bonding layer material in a sanitary product to perform efficient and durable sterilization and ensure good breathability, so that a user can obtain good experience.

Description

Disposable hygienic product with antibacterial function

Technical Field

The invention relates to a disposable sanitary product, in particular to a disposable sanitary product with a bacteriostatic function.

Background

Women are most vulnerable to skin damage in sensitive areas during the menstrual period. The existing sanitary towel mainly has the function of absorbing menstrual blood, and can not effectively sterilize during the menstrual period, so that the investigation shows that more than half of women feel pruritus and burning pain in the vagina during the menstrual period, and in addition, more than 80 percent of women have the phenomena of dysmenorrheal, cold womb and the like. And traditional sanitary towel, its structure generally includes from top to bottom the liquid-permeable surface course, absorber and the liquid-tight nature bottom that the stromatolite set up in proper order to set up the flank in the horizontal both sides of liquid-tight nature bottom, set up the gum and glue on the bottom surface of liquid-tight nature bottom and leave type paper. Because the menstrual blood contains rich nutrient substances such as hemoglobin and the like, anaerobic microorganisms grow rapidly in a damp environment around the external vagina, a lot of peculiar smell is brought, the sanitary towel with the traditional structure has no bacteriostatic effect, does not have the function of eliminating the peculiar smell, and is not dry and comfortable to wear.

In the prior art, different technical methods are developed for degerming of sanitary napkins, for example, CN110613557B discloses a preparation method of a disposable absorbent sanitary product, slow-release bacteriostatic particles are compounded on the surface of a liquid-tight bottom layer, the slow-release bacteriostatic particles comprise calcium peroxide, sodium bicarbonate and citric acid, but the bacteriostatic and breathable effects are limited, and the bacteriostatic effect is affected by more menstrual blood; the silver-loaded antibacterial sanitary towel in CN108686256B adopting other technologies is prepared from silver-loaded antibacterial fibers and materials with excellent water absorption performance, gelatin containing abundant hydrophilic groups such as hydroxyl groups and amino groups in molecular chains and polyvinyl alcohol containing a large number of hydroxyl groups generate a network space structure through a cross-linking effect, the surface is compact and uniform, the water absorption and air permeability are good, meanwhile, nano silver particles are uniformly attached to the surface of the fibers, and the antibacterial effect of the prepared nano silver is influenced by the appearance, the surface activity sites and the element composition.

In order to enable the sanitary napkin to have better antibacterial effect, more and more researchers begin to research and obtain silver with different shapes to obtain better antibacterial effect, in addition, besides silver, other metals have good antibacterial effect in the antibacterial field, such as copper and copper ions, which are broad-spectrum inorganic antibacterial and antivirus materials and are widely applied in the antibacterial field, researchers can improve the antibacterial effect by adding double antibacterial metals, more and more people begin to research the synergistic effect of alloys, and how to prepare copper and silver into an alloy with a specific shape to better exert the antibacterial advantage is a difficult problem faced by people.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a disposable sanitary product with a bacteriostatic function.

The invention adopts the following technical scheme:

a disposable hygienic product with antibacterial function comprises a surface layer, a water absorbing layer and a bottom layer, wherein bonding layers are arranged between the surface layer and the water absorbing layer and between the water absorbing layer and the bottom layer; the adhesive layer is a hot melt adhesive with an antibacterial function, and CuAg alloy nano particles and/or micro-nano activated carbon are uniformly dispersed in the hot melt adhesive; the surface layer is made of hydrophilic non-woven fabric; the water absorption layer contains a high water absorption resin material; the bottom layer is a breathable protective bottom film layer covered with a leakage-proof interlayer;

the preparation method of the CuAg alloy nano particles comprises the following steps:

(1) dissolving copper nitrate and silver nitrate in absolute ethyl alcohol, and uniformly mixing to form a solution A;

(2) dissolving NaOH in 70-75% ethanol (volume fraction) to obtain solution B, and slowly dripping the solution B into the solution A under the stirring condition to obtain solution C;

(3) adding Sodium Dodecyl Sulfate (SDS) and NaF into the solution C, stirring uniformly, transferring into a reaction kettle, carrying out hydrothermal reaction at a certain temperature, filtering, washing and drying to obtain the triangular spiny CuAg alloy nanoparticles.

Preferably, the molar ratio of Ag to Cu in the step (1) is 1: 0.5-1.2.

Preferably, the concentration of NaOH in the solution B in the step (2) is 1.5-2 mol/L.

Preferably, the hydrothermal reaction in the step (3) is carried out for 2-4 h at 170-220 ℃.

Preferably, the mass ratio of the SDS and the NaF in the step (3) is 1-2: 1, and the solid-liquid ratio of the SDS and the liquid C is 8-12 g: 1L.

Preferably, the water absorbing material of the water absorbing layer is a polymer resin material.

Preferably, the hot melt adhesive comprises the following main components in percentage by weight: 20-40% of matrix resin, 30-50% of tackifier, 10-15% of plasticizer, 0-2% of antioxidant and 2-20% of functional material.

Preferably, the matrix resin is one or more of polyolefin and copolymer thereof, thermoplastic elastomer and cellulose derivative, the tackifier is natural resin or synthetic resin, the plasticizer is paraffin or mineral oil, the antioxidant is phenol antioxidant or phosphorus antioxidant, and the functional material is nano triangular spiny CuAg alloy powder and/or micro-nano activated carbon.

Preferably, adopt vertical mixer to produce hot melt adhesive, concrete step is:

a. firstly, adding plasticizer, antioxidant, nano-scale metal alloy powder and micro-nano activated carbon and adding other auxiliary agents according to the product requirements in a mixer, uniformly mixing,

b. adding tackifier, adding into the mixture for several times according to the amount of the thickener to prevent agglomeration,

c. when the tackifier is completely dissolved, the matrix resin is added in batches for multiple times according to the quantity to prevent agglomeration,

d. and (5) extruding, cutting and packaging.

Preferably, a horizontal mixer is adopted to produce hot melt adhesive, and the method comprises the following specific steps:

a. adding matrix resin, antioxidant, nanoscale metal alloy powder, micro-nano activated carbon and plasticizer into a mixer, uniformly mixing,

b. adding the tackifier in batches according to the quantity,

c. and (5) extruding, cutting and packaging.

Has the advantages that: in order to achieve a good antibacterial effect, the copper-silver alloy nano particles with triangular spines are synthesized by selecting a proper dispersing agent and a morphology regulating agent under a specific condition, have more step atoms and higher active density through the synergistic effect of the dispersing agent and the morphology regulating agent, and can ensure good air permeability when being used as an antibacterial layer material in a disposable sanitary product to carry out efficient and lasting sterilization, so that a user can obtain good experience.

Drawings

FIG. 1 is a TEM image of CuAg alloy nanoparticles of example 1;

FIG. 2 is a TEM image of CuAg alloy nanoparticles of example 2;

FIG. 3 is a TEM image of CuAg alloy nanoparticles of example 3;

FIG. 4 is a TEM image of Cu nanoparticles of example 4;

FIG. 5 is a TEM image of Ag nanoparticles of example 5;

fig. 6 is a schematic diagram of the bacteriostatic hot melt adhesive of the invention.

The specific implementation mode is as follows:

in order to make the objects, technical solutions and advantages of the present invention clearer, the present invention is described in detail below with reference to specific examples and experimental data, and it should be understood that the specific examples described herein are only for explaining the present invention and are not intended to limit the present invention.

Example 1

A disposable sanitary article with bacteriostatic function,

the water absorption layer is arranged between the surface layer and the water absorption layer, and the bonding layer is arranged between the water absorption layer and the bottom layer; the adhesive layer is a hot melt adhesive with an antibacterial function, and CuAg alloy nano particles and/or micro-nano activated carbon are uniformly dispersed in the hot melt adhesive; the surface layer is made of hydrophilic non-woven fabric; the water absorption layer is made of high water absorption resin material; the bottom layer is a breathable protective bottom film layer covered with a leakage-proof interlayer;

the preparation method of the triangular thorn-shaped CuAg alloy nano particles comprises the following steps: (1) dissolving copper nitrate and silver nitrate in a molar ratio of 1:1 in absolute ethyl alcohol, and uniformly mixing to obtain a mixed solution A with silver ion and copper ion concentrations of 0.75 mol/L;

(2) dissolving NaOH in 70-75% ethanol (volume fraction) to obtain a NaOH ethanol solution B with the concentration of 1.5 mol/L; slowly dripping the solution B into the solution A under the stirring condition to obtain solution C, wherein the molar ratio of the NaOH content of the solution B to the Ag content of the solution A is 2: 1;

(3) adding SDS (sodium dodecyl sulfate) and a morphology regulator (NaF) into the solution C, uniformly stirring, transferring into a reaction kettle, carrying out hydrothermal reaction for 3h at 190 ℃, filtering, washing and drying to obtain the triangular thorn-shaped CuAg alloy nanoparticles (shown in figure 1). Wherein the mass ratio of SDS to NaF is 2:1, and the solid-to-liquid ratio of SDS to C liquid is 10 g: 1L.

The hot melt adhesive comprises the following main components in parts by weight: the anti-bacterial coating comprises, by mass, 30% of matrix resin, 40% of tackifier, 12% of plasticizer, 1% of antioxidant, 7% of metal nanoparticles and 10% of micro-nano activated carbon, wherein the matrix resin is a styrene block copolymer (SBC, SBS and SIS) with the molecular weight of 20 ten thousand, the tackifier is petroleum resin, the molecular weight of the tackifier is 2000, the softening point temperature of the tackifier is 130 ℃, the plasticizer is mineral oil, the molecular weight of the plasticizer is 900, the antioxidant is 2, 6-di-tert-butyl p-cresol, the functional material is nano triangular thorn-shaped CuAg alloy powder and/or micro-nano activated carbon, and the anti-bacterial coating is produced by a vertical mixer and applied to an antibacterial layer by a line glue production process.

Example 2

The sanitary article was prepared as in example 1, except for the difference in the material of the antibacterial layer. In the preparation process of the CuAg alloy nano particle of the antibacterial layer, a morphology control agent NaF is not added, and the morphology of the nano crystal obtained by the preparation method is shown in figure 2.

Example 3

The sanitary article was prepared as in example 1, except for the difference in the material of the antibacterial layer. During the preparation process of the CuAg alloy nano-particles of the antibacterial layer, SDS is not added, and the appearance of the nano-crystals obtained by the preparation method is shown in figure 3.

Example 4

The sanitary article was prepared as in example 1, except for the difference in the material of the antibacterial layer. In the preparation process of the Ag nano particles of the antibacterial layer, copper nitrate is not added, and the appearance of the nano crystal obtained by the preparation method is shown in figure 4.

Example 5

The sanitary article was prepared as in example 1, except for the difference in the material of the antibacterial layer. The different materials are different, silver nitrate is not added in the preparation process of the Cu nano particles of the antibacterial layer, and the appearance of the nano crystal obtained by the preparation method is shown in figure 5.

It can be seen from the above examples that, in the synthesis process of the nanocrystals, SDS and NaF have a synergistic effect on the morphology control of the CuAg alloy, and if only one metal precursor is reacted, a specific trigonal spiny morphology nanocrystal cannot be obtained, i.e., SDS and NaF in the reaction system of example 1 of the present invention act together on the crystal growth of Ag and Cu to form a specific trigonal spiny morphology.

The bacteriostatic performance of the bacteriostatic sanitary product of the embodiment 1-5 is tested, and the specific test steps are as follows: activating the strain, and adjusting the concentration of the strain to 10⁶-10⁸The cfu/ml bacterial liquid is respectively transferred to lml and placed into culture dishes, nutrient broth agar is added, a silver-loaded bacteriostatic sanitary article sample with the diameter of 21mm and the thickness of 5mm is placed in the center of each culture dish, and a bacterial growth inhibition zone, namely a bacteriostatic zone, can appear around the round plate. After incubation at 37 ℃ for 48 hours, the zone diameter around the circular sample was observed and recorded.

Result table for bacteriostatic performance of sanitary article

	48-hour bacteriostatic loop
		Example 1	40.8
Example 2	30.1
		Example 3	32.4
Example 4	29.5
		Example 5	24.2

According to the tests, the antibacterial effects of the nanocrystals with different shapes and different components are different, the antibacterial effect of the alloy is better than that of a single metal, and the triangular thorn-shaped copper-silver alloy nanoparticles have more step atoms and higher active density due to the unique shape, so that the triangular thorn-shaped copper-silver alloy nanoparticles show better antibacterial effect compared with the spheroidal and triangular CuAg nanoparticles.

Claims

1. A disposable hygienic product with antibacterial function comprises a surface layer, a water absorbing layer and a bottom layer, wherein bonding layers are arranged between the surface layer and the water absorbing layer and between the water absorbing layer and the bottom layer;

the adhesive layer is a hot melt adhesive with an antibacterial function, and CuAg alloy nanoparticles and micro-nano activated carbon are uniformly dispersed in the hot melt adhesive;

the bottom layer is a breathable protective bottom film layer covered with a leakage-proof interlayer;

the preparation method of the CuAg alloy nano particles is characterized by comprising the following steps:

(3) adding SDS and NaF into the solution C, stirring uniformly, transferring into a reaction kettle, carrying out hydrothermal reaction at a certain temperature, filtering, washing and drying to obtain the triangular thorn-shaped CuAg alloy nano particles.

2. The disposable sanitary product with bacteriostatic function according to claim 1, wherein the molar ratio of Ag to Cu in step (1) is 1: 0.5-1.2.

3. The disposable sanitary product with antibacterial function of claim 1, wherein the concentration of NaOH in the solution B in the step (2) is 1.5-2 mol/L.

4. The disposable hygienic article with the bacteriostatic function according to claim 1, wherein the hydrothermal reaction in the step (3) is carried out at 170-220 ℃ for 2-4 h.

5. The disposable hygienic article with the bacteriostatic function according to claim 1, wherein the mass ratio of SDS to NaF in the step (3) is 1-2: 1, and the solid-to-liquid ratio of SDS to C liquid is 8-12 g: 1L.

6. The disposable sanitary product with bacteriostatic function according to any one of claims 1 to 5, wherein the hot melt adhesive comprises the following main components in percentage by weight: 20-40% of matrix resin, 30-50% of tackifier, 10-15% of plasticizer, 2% of antioxidant, 2-20% of nano triangular spiny CuAg alloy powder and micro-nano activated carbon mixture.

7. The disposable hygienic article with a bacteriostatic function according to claim 6, wherein the matrix resin is one or more of polyolefin and copolymer thereof, thermoplastic elastomer and cellulose derivative, the tackifier is natural resin or synthetic resin, the plasticizer is mineral oil, and the antioxidant is phenolic antioxidant or phosphorous antioxidant.

8. The disposable sanitary product with bacteriostatic function according to claim 7, wherein a vertical mixer is adopted to produce hot melt adhesive, and the specific steps are as follows:

a. firstly, adding a plasticizer, an antioxidant, nano triangular thorn-shaped CuAg alloy powder and micro-nano activated carbon and adding other auxiliary agents according to the product requirements into a mixer, and uniformly mixing;

b. adding a tackifier, and adding the tackifier in batches for multiple times according to the quantity to prevent agglomeration;

c. after the tackifier is completely dissolved, the matrix resin is added in batches for multiple times according to the quantity, so that agglomeration is prevented;

d. and (5) extruding, cutting and packaging.

9. The disposable sanitary product with bacteriostatic function according to claim 7, wherein a horizontal mixer is adopted to produce hot melt adhesive, and the specific steps are as follows:

a. adding matrix resin, an antioxidant, nano triangular thorn-shaped CuAg alloy powder, micro-nano activated carbon and a plasticizer into a mixer, and uniformly mixing;

b. adding the tackifier in batches for multiple times according to the quantity;

c. and (5) extruding, cutting and packaging.