Deodorized disposable hygienic article and method of making same

Abstract

The present application relates to the field of sanitary products, and provides a deodorizing disposable sanitary product and a preparation method thereof, which solves the problem that the existing disposable sanitary products cannot remove the peculiar smell emitted after the human excretion is discharged, and comprises a liquid-permeable surface layer, an absorbent and a liquid-impermeable bottom layer which are sequentially stacked from top to bottom, wherein the absorbent comprises the following raw materials by weight: 10-50 parts of high molecular water-absorbing resin, 2-10 parts of silicon dioxide, 5-10 parts of surfactant, 0.1-1.2 parts of fragrance, and 0.2-1 part of water-based adhesive; the liquid-impermeable bottom layer is composed of a hydrophobic deodorizing breathable film and a hydrophobic non-woven fabric which is compounded at the bottom of the hydrophobic deodorizing breathable film, and the raw materials of the hydrophobic deodorizing breathable film are composed of 5-20 parts by weight of hydrophobic deodorizing silicon dioxide, 100 parts by weight of polyolefin resin and 3-8 parts by weight of processing aid.

Description

Technical Field

[0001] The present invention relates to the field of sanitary products, in particular to a deodorizing disposable sanitary product and a preparation method thereof. Background Art

[0002] Disposable sanitary products, including baby diapers, sanitary napkins, and adult diapers, typically consist of a liquid-permeable top layer, an absorbent body, and a liquid-impermeable back layer stacked in sequence from top to bottom. The liquid-permeable top layer, the material closest to the skin, absorbs and diffuses liquid into the absorbent body, typically made of hydrophilic nonwoven fabric. The absorbent body absorbs, stores, and secures liquid, while the liquid-impermeable back layer serves to trap liquid within the absorbent body. Traditional disposable sanitary products lack deodorizing properties. Human excreta often produces an odor after being discharged from the body. In order to remove the odor, Chinese Patent No. 202011223670.1 discloses a dry, antibacterial and odor-removing adult diaper and a preparation method thereof. The diaper includes a surface layer, an antibacterial and odor-removing filter core layer, an absorbent core layer and a bottom film layer from top to bottom; the surface layer is provided with a diversion embossing; the antibacterial and odor-removing filter core layer is composed of a non-woven fabric wrapped with super absorbent resin, honeysuckle powder and mugwort powder; the absorbent core layer is composed of an absorbent layer and a wrapping layer, and the absorbent layer includes a first absorbent layer and a second absorbent layer, the first absorbent layer is a super absorbent resin layer formed of super absorbent resin, and the second absorbent layer is a mixed layer composed of fluff pulp and super absorbent resin; the super absorbent resin contained in the first absorbent layer and the second absorbent layer accounts for 6-15% and 11-20% of the total mass of the absorbent layer, respectively, and the fluff pulp contained in the second absorbent layer accounts for 65-75% of the total mass of the absorbent layer. The diapers of this invention play an antibacterial and odor-removing role by adding mugwort and honeysuckle, but these two substances play an odor-removing role by inhibiting the growth of bacteria. When the human body excretes urine and other excreta, the odor emitted cannot be absorbed or removed by the antibacterial and odor-removing filter core layer described in this invention. Summary of the Invention

[0003] Therefore, in response to the above problems, the present invention provides a deodorizing disposable sanitary product and a preparation method thereof, which solves the problem that the disposable sanitary products in the prior art cannot remove the odor emitted after the discharge of human excreta.

[0004] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: a deodorizing disposable sanitary product, comprising a liquid-permeable surface layer, an absorbent body and a liquid-impermeable bottom layer stacked in sequence from top to bottom, wherein the absorbent body contains the following raw materials in parts by weight: 10-50 parts of a high-molecular-weight water-absorbing resin, 2-10 parts of silicon dioxide, 5-10 parts of a surfactant, 0.1-1.2 parts of a fragrance, and 0.2-1 parts of a water-based adhesive; the liquid-impermeable bottom layer is composed of a hydrophobic deodorizing breathable membrane and a hydrophobic non-woven fabric composited on the bottom of the hydrophobic deodorizing breathable membrane, and the raw materials of the hydrophobic deodorizing breathable membrane are composed of 5-20 parts by weight of hydrophobic deodorizing silicon dioxide, 100 parts by weight of a polyolefin resin, and 3-8 parts by weight of a processing aid.

[0005] Furthermore, the preparation method of the hydrophobic deodorizing silica is as follows: (1) preparing raw materials: using fumed silica as raw material; (2) adding an alkylating agent to the fumed silica described in step (1), wherein the mass ratio of the alkylating agent to the fumed silica is 5-20:100, reacting for 0.5-2 hours, and controlling the reaction temperature at 150-200°C to obtain hydrophobic silica; (3) adding ethanol and a deodorant solution to the hydrophobic silica in step (2) at room temperature, stirring for 1-4 hours, centrifugally filtering and drying, and controlling the moisture content to be within 400 ppm to obtain hydrophobic deodorizing silica.

[0006] Further: the alkylating agent is any one of hexamethyldisilazane, trimethoxyoctadecylsilane, dimethyldichlorosilane, and trimethylchlorosilane.

[0007] Furthermore: the deodorant is a plant deodorant containing any one of arginine, glycine, alanine, and amino acid cations, and the solid content of the deodorant is 30-35wt%.

[0008] Furthermore, the mass ratio of the deodorant, ethanol and hydrophobic silica is 0.2-1:50-100:20-50, the particle size of the hydrophobic silica is 10-100 nm, the average adsorption pore size is 0.1-1.0 nm, and the specific surface area is 100-500 m 2 / g.

[0009] Furthermore, the preparation process of the absorbent includes the following steps: (1) adding a surfactant to the fragrance to emulsify it so that the fragrance is wrapped by the surfactant; (2) uniformly mixing a high molecular weight water-absorbing resin and silicon dioxide with a pore size of 2-50 nm, and adding an aqueous adhesive to bond the high molecular weight water-absorbing resin and silicon dioxide into one; (3) adding the emulsified fragrance in step (1) to the material in step (2), and mixing and stirring them evenly.

[0010] Furthermore: the water-based adhesive is an acrylic water-based adhesive.

[0011] Furthermore: the fragrance is essential oil.

[0012] A method for preparing a deodorizing disposable sanitary product, comprising the following preparation steps:

[0013] (1) preparing a liquid-permeable surface layer;

[0014] (2) Preparation of absorbent: a. Adding a surfactant to the fragrance to emulsify it so that the fragrance is wrapped by the surfactant; b. Evenly mixing a high molecular weight water-absorbing resin and silicon dioxide with a pore size of 2-50 nm, adding a water-based adhesive to bond the high molecular weight water-absorbing resin and the silicon dioxide into one; c. Adding the fragrance emulsified in step a to the material in step b, mixing and stirring uniformly to obtain a preform; d. Feeding the preform and fluff pulp into a mold cavity of a mold wheel at a weight ratio of 1:30-100 to form the preform, and then demolding to obtain an absorbent;

[0015] (3) Preparation of a liquid-impermeable bottom layer: unwinding a hydrophobic nonwoven fabric, transferring it online, and laminating a hydrophobic deodorizing breathable film online on its surface, wherein the preparation method of the hydrophobic deodorizing breathable film comprises the following steps: a. mixing 5-20 parts by weight of hydrophobic deodorizing silica, 100 parts by weight of a polyolefin resin, and 3-8 parts by weight of a processing aid, stirring uniformly to obtain a mixture; b. feeding the mixture into a screw extruder, melt-extruding, and cooling; c. performing four-stage stretching through a stretching mechanism, with stretching ratios of 1.1-1.3, 1.4-1.5, 1.6-1.7, and 1.5-1.6, respectively; d. shaping and cooling;

[0016] (4) The liquid-permeable surface layer, absorbent body and liquid-impermeable bottom layer transmitted online are combined into one body, and then cut into pieces to obtain individual deodorizing disposable sanitary products;

[0017] The preparation method of the hydrophobic deodorizing silica described in step (3) is as follows: a. preparing raw materials: using fumed silica as raw material; b. adding an alkylating agent to the fumed silica described in step a, wherein the mass ratio of the alkylating agent to the fumed silica is 5-20:100, reacting for 0.5-2 hours, and controlling the reaction temperature at 150-200°C to obtain hydrophobic silica; c. adding ethanol and a deodorant solution to the hydrophobic silica in step b at room temperature, stirring for 1-4 hours, centrifugally filtering and drying, and controlling the moisture content to be within 400 ppm to obtain hydrophobic deodorizing silica.

[0018] By adopting the above technical solution, the beneficial effects of the present invention are:

[0019] The deodorizing disposable sanitary product of the present invention has an absorbent body added with silicon dioxide, a fragrance, a surfactant, a water-based adhesive, and a high-molecular water-absorbent resin. During preparation, the addition of the water-based adhesive can be used to seal the fragrance adsorbed by the silicon dioxide, and can also play a role in bonding the high-molecular water-absorbent resin and the silicon dioxide, so that the high-molecular water-absorbent resin and the silicon dioxide are bonded into a whole, thereby avoiding the problem of stratification and segregation between the two due to inconsistent densities.

[0020] A surfactant is first added to the fragrance for emulsification, encapsulating the fragrance. This exposes the hydrophilic groups, which can then bind to the hydroxyl groups of silica. When urine enters the fragrance, the hydroxyl groups tend to bind with water, releasing the fragrance. The fragrance of the present invention is preferably an essential oil, and this emulsification process prevents the essential oil from volatilizing too quickly.

[0021] The water-based adhesive also acts as a moisture barrier, preventing the essential oils in the silica from being released prematurely.

[0022] The breathable film used in the liquid-impermeable bottom layer is a hydrophobic deodorizing breathable film, which, combined with the absorbent body, has a dual deodorizing and deodorizing effect, and has a good deodorizing effect.

[0023] 5. The silica of the present invention has a large amount of fragrance in its surface pores and internal channels. The aqueous adhesive can seal the silica. However, after the excreta enters the absorbent, the aqueous adhesive can be diluted and dissolved by the excreta, thereby releasing the aromatic essential oil and playing a role in deodorizing.

[0024] 6. The hydrophobic, deodorizing, and breathable base film of the present invention is composed of raw materials consisting of 5-20 parts by weight of hydrophobic, deodorizing silica, 100 parts by weight of polyolefin resin, and 3-8 parts by weight of processing aids. The hydrophobic, deodorizing silica is prepared by reacting an alkylating agent with the hydroxyl groups on the surface of silica. By controlling the degree of alkylation of the reaction, silica particles with a hydrophobic surface and hydrophilic internal pores are prepared. The plant deodorant is then loaded into the hydrophilic internal pores of the porous silica particles by hydrogen bonding with the carboxyl, amino and other functional groups of the plant deodorant and the hydroxyl groups in the internal pores of the porous silica particles, so that the silica particles with hydrophobic surfaces have deodorizing properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 :(a)Water drop contact angle diagram of alkylated silica particles,(b)Water drop contact angle diagram of deodorizing loaded alkylated silica particles;

[0026] Figure 2 This is a high-resolution TEM image and EDS spectrum of alkylated silica particles;

[0027] Figure 3This is a high-resolution TEM photo and EDS spectrum of deodorizing alkylated silica particles. DETAILED DESCRIPTION Example 1

[0028] refer to Figures 1 to 3 A deodorizing adult diaper comprises a liquid-permeable surface layer, an absorbent body and a liquid-impermeable bottom layer stacked in sequence from top to bottom, wherein the absorbent body is composed of 10 parts by weight of a high molecular weight water-absorbent resin, 2 parts by weight of silica, 5 parts by weight of a surfactant, 1 part by weight of an essential oil, 0.5 parts by weight of an acrylic acid aqueous adhesive, and 900 parts by weight of fluff pulp; the liquid-impermeable bottom layer is composed of a hydrophobic deodorizing breathable membrane and a hydrophobic non-woven fabric composited on the bottom of the hydrophobic deodorizing breathable membrane; the hydrophobic deodorizing breathable membrane is composed of 5 parts by weight of hydrophobic deodorizing silica, 100 parts by weight of a polyolefin resin, and 3 parts by weight of a processing aid.

[0029] The preparation method of the hydrophobic deodorizing silica is as follows: (1) preparing raw materials: using fumed silica as raw material; (2) adding hexamethyldisilazane to the fumed silica described in step (1), with the mass ratio of the alkylating agent to the fumed silica being 5:100, reacting for 0.5 h, and controlling the reaction temperature at 150° C. to obtain hydrophobic deodorizing silica; (3) adding ethanol and a plant deodorant solution containing arginine to the hydrophobic silica in step (2) at room temperature, stirring for 1 h, centrifugally filtering and drying, and controlling the moisture content within 400 ppm to obtain hydrophobic deodorizing silica.

[0030] The solid content of the plant deodorant is 30wt%, the mass ratio of the plant deodorant, ethanol and hydrophobic silica is 0.2:50:20, the silica particle size is 18nm, the average adsorption pore size is 0.24nm, and the specific surface area is 215m 2 / g.

[0031] The preparation process of the absorbent is as follows: a. adding a surfactant to the essential oil for emulsification so that the essential oil is wrapped by the surfactant; b. uniformly mixing a high molecular weight water-absorbent resin and silicon dioxide with a pore size of 10 nm, and adding an acrylic acid-based aqueous adhesive to bond the high molecular weight water-absorbent resin and the silicon dioxide into one; c. adding the essential oil emulsified in step a to the material in step b, mixing and stirring uniformly to obtain a preform; d. feeding the preform and fluff pulp into a mold cavity of a mold wheel according to a proportion for molding, and then demolding to obtain the absorbent. Example 2

[0032] A method for preparing deodorized adult diapers, comprising the following preparation steps:

[0033] (1) preparing a liquid-permeable surface layer;

[0034] (2) Preparation of absorbent: a. Adding a surfactant to the essential oil for emulsification so that the essential oil is wrapped by the surfactant; b. Evenly mixing a high molecular weight water-absorbing resin and silicon dioxide with a pore size of 10 nm, adding an acrylic acid-based aqueous adhesive to bond the high molecular weight water-absorbing resin and the silicon dioxide into one; c. Adding the essential oil emulsified in step a to the material in step b, mixing and stirring uniformly to obtain a preform; d. Feeding the preform and the fluff pulp into a mold wheel mold cavity according to a ratio for molding, and then demolding to obtain an absorbent;

[0035] (3) Preparation of a liquid-impermeable bottom layer: unwinding a hydrophobic nonwoven fabric, transferring it online, and compounding a hydrophobic deodorizing breathable film online on its surface, wherein the preparation method of the hydrophobic deodorizing breathable film comprises the following steps: a. mixing 50 parts by weight of hydrophobic deodorizing silica, 100 parts by weight of a polyolefin resin, and 3 parts by weight of a processing aid, stirring uniformly to obtain a mixture; b. feeding the mixture into a screw extruder, melt-extruding, and cooling; c. performing four-stage stretching through a stretching mechanism, with stretching ratios of 1.3, 1.5, 1.7, and 1.6, respectively; d. finalizing the process and cooling;

[0036] The preparation method of hydrophobic deodorizing silica is as follows: a. preparing raw materials: using fumed silica as raw material; b. adding an alkylating agent to the fumed silica described in step (1), wherein the mass ratio of the alkylating agent to the fumed silica is 5-20:100, reacting for 1 hour, and controlling the reaction temperature at 150°C to obtain hydrophobic silica; c. adding ethanol and a deodorizing agent solution to the hydrophobic silica in step (2) at room temperature, stirring for 2 hours, centrifugally filtering and drying, and controlling the moisture content within 400 ppm to obtain hydrophobic deodorizing silica;

[0037] (4) The liquid-permeable surface layer, absorbent body and liquid-impermeable bottom layer transmitted online are compounded into one body, and then cut into pieces to obtain individual deodorizing disposable sanitary products. Example 3

[0038] Referring to Example 1, compared with Example 1, the absorbent of this embodiment is composed of 25 parts of a high molecular weight water-absorbent resin, 8 parts of silica, 6 parts of a surfactant, 0.8 parts of a fragrance, and 0.5 parts of an aqueous adhesive; chitosan antibacterial agent is also added during the preparation of the hydrophobic deodorizing silica, specifically, it is added together with the deodorant solution in step c.

[0039] Other technical solutions are the same as those in Example 1. Example 4

[0040] With reference to Example 2 and Example 3, this example adopts the material ratio of Example 3 to prepare a deodorizing disposable sanitary product, and other technical solutions are the same as those of Example 2. Example 5

[0041] Referring to Example 1, compared with Example 1, the absorbent body of this embodiment is composed of 50 parts by weight of a high molecular water-absorbent resin, 10 parts by weight of silica, 10 parts by weight of a surfactant, 1.2 parts by weight of essential oil, 1 part by weight of an aqueous adhesive, and 1000 parts by weight of fluff pulp; the hydrophobic deodorizing breathable membrane is composed of 20 parts by weight of hydrophobic deodorizing silica, 100 parts by weight of a polyolefin resin, and 8 parts by weight of a processing aid. Other technical solutions are the same as those in Example 1. Example 6

[0042] With reference to Example 2 and Example 5, this example adopts the material ratio of Example 5 to prepare a deodorizing disposable sanitary product, and other technical solutions are the same as those of Example 2.

[0043] In addition, in the present invention, the alkylating agent is any one of hexamethyldisilazane, trimethoxyoctadecylsilane, dimethyldichlorosilane, and trimethylchlorosilane, and the deodorant is a plant deodorant containing any one of arginine, glycine, alanine, and amino acid cations. The solid content of the deodorant is 30-35wt%. The above technical solutions can achieve the purpose of the present invention.

[0044] In the present invention, the surfactant is a material well known in the prior art and will not be described in detail herein. The aqueous adhesive can be replaced by polyvinyl alcohol, which can also achieve the purpose of the present invention.

[0045] Comparative Example 1

[0046] A deodorizing adult diaper. Compared with Example 1, no surfactant is added to the absorbent material of this comparative example.

[0047] The embedding efficiency of the flavor by silica in Examples 1, 3, and 5 of the present invention and Comparative Example 1 was tested. The test method was as follows: 100 g of the preforms of each Example and Comparative Example were added with ethanol and continuously shaken to dissolve the unencapsulated flavor in the ethanol. The filtrate was filtered and analyzed. The test results are as follows:

[0048]

[0049] Although the present invention has been particularly shown and described in conjunction with preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made to the present invention without departing from the spirit and scope of the invention as defined in the appended claims, and all such changes are within the scope of protection of the present invention.

Claims

1. A deodorizing disposable sanitary product comprising a liquid-permeable surface layer, an absorbent body, and a liquid-impermeable bottom layer stacked in sequence from top to bottom, characterized in that: The absorbent body comprises the following raw materials in parts by weight: 10-50 parts of a high molecular weight water-absorbing resin, 2-10 parts of silicon dioxide, 5-10 parts of a surfactant, 0.1-1.2 parts of a fragrance, and 0.2-1 parts of a water-based adhesive; the liquid-impermeable bottom layer comprises a hydrophobic deodorizing breathable membrane and a hydrophobic non-woven fabric composited to the bottom of the hydrophobic deodorizing breathable membrane; the raw materials of the hydrophobic deodorizing breathable membrane comprise 5-20 parts by weight of hydrophobic deodorizing silicon dioxide, 100 parts by weight of a polyolefin resin, and 3-8 parts by weight of a processing aid; The preparation method of the hydrophobic deodorizing silica is as follows: (1) preparing raw materials: using fumed silica as raw material; (2) adding an alkylating agent to the fumed silica described in step (1), wherein the mass ratio of the alkylating agent to the fumed silica is 5-20:100, reacting for 0.5-2 hours, and controlling the reaction temperature at 150-200°C to obtain hydrophobic silica; (3) adding ethanol and a deodorant solution to the hydrophobic silica in step (2) at room temperature, stirring for 1-4 hours, centrifugally filtering and drying, and controlling the moisture content within 400 ppm to obtain hydrophobic deodorizing silica.

2. A deodorizing disposable sanitary product according to claim 1, characterized in that: The alkylating agent is any one of hexamethyldisilazane, trimethoxyoctadecylsilane, dimethyldichlorosilane and trimethylchlorosilane.

3. A deodorizing disposable sanitary product according to claim 1, characterized in that: The deodorant is a plant deodorant containing any one of arginine, glycine, alanine and amino acid cations, and the solid content of the deodorant is 30-35wt%.

4. A deodorizing disposable sanitary product according to claim 1, characterized in that: The mass ratio of the deodorant, ethanol and hydrophobic silica is: 0.2-1:50-100:20-50. The particle size of the hydrophobic silica is 10-100 nm, the average adsorption pore size is 0.1-1.0 nm, and the specific surface area is 100-500 m 2 / g.

5. A deodorizing disposable sanitary product according to claim 1, characterized in that: The preparation process of the absorbent includes the following steps: (1) adding a surfactant to the fragrance to emulsify it so that the fragrance is wrapped by the surfactant; (2) uniformly mixing a high molecular weight water-absorbing resin and silicon dioxide with a pore size of 2-50 nm, and adding an aqueous adhesive to bond the high molecular weight water-absorbing resin and the silicon dioxide into one; (3) adding the emulsified fragrance in step (1) to the material in step (2), and mixing and stirring them evenly.

6. A deodorizing disposable sanitary product according to claim 2, characterized in that: The water-based adhesive is an acrylic water-based adhesive.

7. A deodorizing disposable sanitary product according to claim 2, characterized in that: The fragrance is essential oil.

8. A method for preparing a deodorizing disposable sanitary product, characterized in that: The preparation process includes the following: (1) preparing a liquid-permeable surface layer; (2) Preparation of absorbent: a. Adding a surfactant to the fragrance to emulsify it so that the fragrance is wrapped by the surfactant; b. Evenly mixing a high molecular weight water-absorbing resin and silicon dioxide with a pore size of 2-50 nm, adding a water-based adhesive to bond the high molecular weight water-absorbing resin and the silicon dioxide into one; c. Adding the fragrance emulsified in step a to the material in step b, mixing and stirring uniformly to obtain a preform; d. Feeding the preform and fluff pulp into a mold cavity of a mold wheel at a weight ratio of 1:30-100 to form the preform, and then demolding to obtain an absorbent; (3) Preparation of a liquid-impermeable bottom layer: unwinding a hydrophobic nonwoven fabric, transferring it online, and laminating a hydrophobic deodorizing breathable film online on its surface, wherein the preparation method of the hydrophobic deodorizing breathable film comprises the following steps: a. mixing 5-20 parts by weight of hydrophobic deodorizing silica, 100 parts by weight of a polyolefin resin, and 3-8 parts by weight of a processing aid, stirring uniformly to obtain a mixture; b. feeding the mixture into a screw extruder, melt-extruding, and cooling; c. performing four-stage stretching through a stretching mechanism, with stretching ratios of 1.1-1.3, 1.4-1.5, 1.6-1.7, and 1.5-1.6, respectively; d. shaping and cooling; (4) The liquid-permeable surface layer, absorbent body and liquid-impermeable bottom layer transmitted online are combined into one body, and then cut into pieces to obtain individual deodorizing disposable sanitary products; The preparation method of the hydrophobic deodorizing silica described in step (3) is as follows: a. preparing raw materials: using fumed silica as raw material; b. adding an alkylating agent to the fumed silica described in step a, wherein the mass ratio of the alkylating agent to the fumed silica is 5-20:100, reacting for 0.5-2 hours, and controlling the reaction temperature at 150-200°C to obtain hydrophobic silica; c. adding ethanol and a deodorant solution to the hydrophobic silica in step b at room temperature, stirring for 1-4 hours, centrifugally filtering and drying, and controlling the moisture content to be within 400 ppm to obtain hydrophobic deodorizing silica.

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