Water-absorbing core body with odor-removing function and preparation method thereof

Abstract

The application discloses a water-absorbing core body with a deodorization function and a preparation method, relates to the technical field of sanitary products, and comprises a wrapping layer and an upper-layer absorbing core, a middle-layer absorbing core and a lower-layer absorbing core which are integrated by being wrapped by the wrapping layer. The middle-layer absorbing core is arranged between the upper-layer absorbing core and the lower-layer absorbing core, the middle-layer absorbing core is provided with containing grooves, the containing grooves are filled with deodorization capsules, the deodorization capsules are polyvinyl alcohol-wrapped tea tree essential oil, and the skin material of the deodorization capsules is soluble in water. The application can not only quickly cover the rust smell of menstrual blood, but also has good antibacterial effect and can well inhibit bacterial reproduction, thereby further avoiding decomposition odor.

Description

Technical Field

[0001] This invention relates to the field of hygiene products technology, and in particular to an absorbent core with deodorizing function and its preparation method. Background Technology

[0002] The absorbent core is an important component of sanitary napkins, primarily used to absorb menstrual blood during a woman's menstrual period. Menstrual blood itself is odorless, but it contains iron. When menstrual blood leaves the body and comes into contact with air, the iron oxidizes and decomposes, producing a faint, metallic or rusty odor. Simultaneously, the vagina contains normal flora. When menstrual blood remains in the vagina, these bacteria break down proteins and lipids in the blood, producing an odor. If sanitary napkins are not changed frequently, menstrual blood accumulates, bacteria multiply rapidly, and the odor becomes stronger.

[0003] Currently, the common method for deodorizing is to add antibacterial agents to the absorbent core. While this method can inhibit bacterial growth, it cannot remove or mask the "rusty smell" caused by blood oxidation. Summary of the Invention

[0004] To address the shortcomings of the existing technology, one objective of this invention is to provide a water-absorbing core with deodorizing function, which removes odors while maintaining antibacterial effects. Another objective of this invention is to provide a method for preparing a water-absorbing core with deodorizing function, which maintains the original preparation process of the absorbent core, does not change the production line, and is suitable for mass production.

[0005] One of the objectives of this invention is achieved through the following technical solution: An absorbent core with deodorizing function includes a wrapping layer and an upper absorbent core, a middle absorbent core, and a lower absorbent core that are integrally wrapped by the wrapping layer. The middle absorbent core is located between the upper absorbent core and the lower absorbent core. The thickness of the upper absorbent core is 1 / (2-3) of the thickness of the middle absorbent core, and the thickness of the lower absorbent core is (1.5-2) times the thickness of the middle absorbent core. The middle absorbent core has a receiving groove filled with a deodorizing capsule. The deodorizing capsule is made of polyvinyl alcohol encapsulating tea tree oil, and the polyvinyl alcohol material of the deodorizing capsule is water-soluble.

[0006] Furthermore, there are at least two receiving grooves, which are opened along the length direction of the water-absorbing core.

[0007] Furthermore, the preparation method of the deodorizing capsule includes the following steps: S1. Dissolve polyvinyl alcohol in deionized water to prepare a polyvinyl alcohol aqueous solution; S2. Add tea tree oil and emulsifier to a polyvinyl alcohol aqueous solution, stir and emulsify to obtain an oil-in-water emulsion; S3. Sodium sulfate solution is added dropwise to an oil-in-water emulsion to form microcapsules, which are then washed and dried to obtain the deodorizing capsules.

[0008] Furthermore, the mass ratio of the polyvinyl alcohol to the tea tree oil is 1:(1-1.5).

[0009] Furthermore, the mass fraction of the polyvinyl alcohol aqueous solution is 4-5%.

[0010] Furthermore, the emulsifier is Tween-80, and the mass ratio of the tea tree oil to the emulsifier is 1:(0.04-0.06).

[0011] Furthermore, in steps S2 and S3, the preparation temperature is 35-40℃.

[0012] Furthermore, the deodorizing capsules have a particle size of 30-60 μm.

[0013] Furthermore, the thickness of the absorbent core is 3-5 mm.

[0014] The second objective of this invention is achieved by the following technical solution: A method for preparing an absorbent core with deodorizing function includes the following steps: placing the middle absorbent core on the lower absorbent core, filling the deodorizing capsule in the receiving groove, placing the upper absorbent core on the middle absorbent core, wrapping the upper absorbent core, the middle absorbent core and the lower absorbent core simultaneously with a wrapping layer, and fixing the absorbent core into one piece using ultrasonic welding.

[0015] The beneficial effects of this invention are: (1) Use deodorizing capsules to remove the odor from the absorbent core. Specifically, polyvinyl alcohol is used as the leather material and tea tree oil is used as the core material. Polyvinyl alcohol encapsulates tea tree oil as a deodorizing capsule. The deodorizing capsule is placed in the upper part of the absorbent core, not exposed on the surface of the absorbent core, and can quickly come into contact with menstrual blood. The leather material, namely polyvinyl alcohol, is soluble in water. When the deodorizing capsule comes into contact with menstrual blood, the leather material of the deodorizing capsule will gradually melt, exposing the tea tree oil inside. On the one hand, tea tree oil can quickly cover the rusty smell of menstrual blood. On the other hand, tea tree oil has a good antibacterial effect and can effectively inhibit bacterial growth, further preventing the decomposition odor.

[0016] (2) The deodorizing capsule is prepared by gel salting out, avoiding the use of cross-linking agents, reducing chemical reagents in the reaction process, and avoiding cross-linking reaction of the leather material, so that the leather material maintains good water solubility. When the deodorizing capsule encounters menstrual blood, the leather material can dissolve quickly, exposing the tea tree essential oil inside, and quickly releasing the tea tree essential oil to ensure the deodorizing effect. Even if the deodorizing capsule is partially broken, under the folded packaging of the sanitary napkin, the essential oil will not completely evaporate, and the absorbent core will carry a faint tea tree essential oil scent, while also carrying antibacterial effect. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view along the length of the water-absorbing core with deodorizing function in this invention; In the diagram: 1. Upper absorption core; 2. Middle absorption core; 3. Lower absorption core; 4. Receiving groove; 5. Deodorizing capsule; 6. Coating layer. Detailed Implementation

[0018] To make the technical problems solved by the invention, the technical solutions and the beneficial effects clearer, the invention will be further described below in conjunction with the accompanying drawings and embodiments. Example 1

[0019] This embodiment provides a water-absorbing core with deodorizing function, including a wrapping layer 6 and an upper absorbent core 1, a middle absorbent core 2, and a lower absorbent core 3 wrapped together by the wrapping layer 6. The middle absorbent core 2 is located between the upper absorbent core 1 and the lower absorbent core 3. The thickness of the water-absorbing core is 4mm. The thickness of the upper absorbent core 1 is 1 / 2 the thickness of the middle absorbent core 2, and the thickness of the lower absorbent core 3 is 1.5 times the thickness of the middle absorbent core 2. The middle absorbent core 2 has two receiving grooves 4 along its length direction. The receiving grooves 4 are located near the middle of the water-absorbing core. The receiving grooves 4 are filled with deodorizing capsules 5. The deodorizing capsules 5 are made of polyvinyl alcohol encapsulating tea tree essential oil. The polyvinyl alcohol material of the deodorizing capsules 5 is water-soluble, and the particle size of the deodorizing capsules 5 is 30-60μm.

[0020] The preparation method of deodorizing capsule 5 includes the following steps: S1, at room temperature, partially hydrolyzed polyvinyl alcohol is dissolved in deionized water to prepare a 4% (w / w) polyvinyl alcohol aqueous solution; S2, at 40°C, tea tree oil and Tween-80 are added to the polyvinyl alcohol aqueous solution, and the mixture is stirred and emulsified to obtain an oil-in-water emulsion; S3, at 40°C, a 4% (w / w) sodium sulfate solution is added dropwise to the oil-in-water emulsion to form microcapsules. The total amount of sodium sulfate solution added is equal to the volume of the polyvinyl alcohol aqueous solution. After standing to remove the supernatant, the capsule is first washed with a 10% (w / w) dilute sodium sulfate solution at about 2°C, and then washed a second time with cold water at about 2°C. Both washes need to be rapid. After washing, the capsule is quickly filtered and dehydrated, and then vacuum dried to obtain deodorizing capsule 5.

[0021] The mass ratio of polyvinyl alcohol to tea tree oil is 1:1, and the mass ratio of tea tree oil to emulsifier is 1:0.04. Example 2

[0022] This embodiment provides a water-absorbing core with deodorizing function, including a wrapping layer 6 and an upper absorbent core 1, a middle absorbent core 2, and a lower absorbent core 3 wrapped together by the wrapping layer 6. The middle absorbent core 2 is located between the upper absorbent core 1 and the lower absorbent core 3. The thickness of the water-absorbing core is 3mm. The thickness of the upper absorbent core 1 is 1 / 3 of the thickness of the middle absorbent core 2, and the thickness of the lower absorbent core 3 is 1.5 times the thickness of the middle absorbent core 2. The middle absorbent core 2 has two receiving grooves 4 along its length direction. The receiving grooves 4 are located near the middle of the water-absorbing core. The receiving grooves 4 are filled with deodorizing capsules 5. The deodorizing capsules 5 are made of polyvinyl alcohol encapsulating tea tree essential oil. The polyvinyl alcohol material of the deodorizing capsules 5 is water-soluble, and the particle size of the deodorizing capsules 5 is 30-60μm.

[0023] The preparation method of deodorizing capsule 5 includes the following steps: S1, at room temperature, partially hydrolyzed polyvinyl alcohol is dissolved in deionized water to prepare a 5% (w / w) polyvinyl alcohol aqueous solution; S2, at 40°C, tea tree oil and Tween-80 are added to the polyvinyl alcohol aqueous solution, and the mixture is stirred and emulsified to obtain an oil-in-water emulsion; S3, at 40°C, a 4% (w / w) sodium sulfate solution is added dropwise to the oil-in-water emulsion to form microcapsules. The total amount of sodium sulfate solution added is equal to the volume of the polyvinyl alcohol aqueous solution. After standing to remove the supernatant, the capsule is first washed with a 10% (w / w) dilute sodium sulfate solution at about 2°C, and then washed a second time with cold water at about 2°C. Both washes need to be rapid. After washing, the capsule is quickly filtered and dehydrated, and then vacuum dried to obtain deodorizing capsule 5.

[0024] The mass ratio of polyvinyl alcohol to tea tree oil is 2:3, and the mass ratio of tea tree oil to emulsifier is 1:0.05. Example 3

[0025] This embodiment provides a water-absorbing core with deodorizing function, including a wrapping layer 6 and an upper absorbent core 1, a middle absorbent core 2, and a lower absorbent core 3 wrapped together by the wrapping layer 6. The middle absorbent core 2 is located between the upper absorbent core 1 and the lower absorbent core 3. The thickness of the water-absorbing core is 5mm. The thickness of the upper absorbent core 1 is 1 / 2 the thickness of the middle absorbent core 2, and the thickness of the lower absorbent core 3 is twice the thickness of the middle absorbent core 2. The middle absorbent core 2 has two receiving grooves 4 along its length direction. The receiving grooves 4 are located near the middle of the water-absorbing core. The receiving grooves 4 are filled with deodorizing capsules 5. The deodorizing capsules 5 are made of polyvinyl alcohol encapsulating tea tree essential oil. The polyvinyl alcohol material of the deodorizing capsules 5 is water-soluble, and the particle size of the deodorizing capsules 5 is 30-60μm.

[0026] The preparation method of deodorizing capsule 5 includes the following steps: S1, at room temperature, partially hydrolyzed polyvinyl alcohol is dissolved in deionized water to prepare a 4% (w / w) polyvinyl alcohol aqueous solution; S2, at 40°C, tea tree oil and Tween-80 are added to the polyvinyl alcohol aqueous solution, and the mixture is stirred and emulsified to obtain an oil-in-water emulsion; S3, at 40°C, a 4% (w / w) sodium sulfate solution is added dropwise to the oil-in-water emulsion to form microcapsules. The total amount of sodium sulfate solution added is equal to the volume of the polyvinyl alcohol aqueous solution. After standing to remove the supernatant, the capsule is first washed with a 10% (w / w) dilute sodium sulfate solution at about 2°C, and then washed a second time with cold water at about 2°C. Both washes need to be rapid. After washing, the capsule is quickly filtered and dehydrated, and then vacuum dried to obtain deodorizing capsule 5.

[0027] The mass ratio of polyvinyl alcohol to tea tree oil is 2:3, and the mass ratio of tea tree oil to emulsifier is 1:0.06. Example 4

[0028] This embodiment provides a water-absorbing core with deodorizing function, including a wrapping layer 6 and an upper absorbent core 1, a middle absorbent core 2, and a lower absorbent core 3 wrapped together by the wrapping layer 6. The middle absorbent core 2 is located between the upper absorbent core 1 and the lower absorbent core 3. The thickness of the water-absorbing core is 4mm. The thickness of the upper absorbent core 1 is 1 / 2 the thickness of the middle absorbent core 2, and the thickness of the lower absorbent core 3 is 1.5 times the thickness of the middle absorbent core 2. The middle absorbent core 2 has two receiving grooves 4 along its length direction. The receiving grooves 4 are located near the middle of the water-absorbing core. The receiving grooves 4 are filled with deodorizing capsules 5. The deodorizing capsules 5 are made of polyvinyl alcohol encapsulating tea tree essential oil. The polyvinyl alcohol material of the deodorizing capsules 5 is water-soluble, and the particle size of the deodorizing capsules 5 is 30-60μm.

[0029] The preparation method of deodorizing capsule 5 includes the following steps: S1, at room temperature, partially hydrolyzed polyvinyl alcohol is dissolved in deionized water to prepare a 4% (w / w) polyvinyl alcohol aqueous solution; S2, at 40°C, tea tree oil and Tween-80 are added to the polyvinyl alcohol aqueous solution, and the mixture is stirred and emulsified to obtain an oil-in-water emulsion; S3, at 40°C, a 4% (w / w) sodium sulfate solution is added dropwise to the oil-in-water emulsion to form microcapsules. The total amount of sodium sulfate solution added is equal to the volume of the polyvinyl alcohol aqueous solution. After standing to remove the supernatant, the capsule is first washed with a 10% (w / w) dilute sodium sulfate solution at about 2°C, and then washed a second time with cold water at about 2°C. Both washes need to be rapid. After washing, the capsule is quickly filtered and dehydrated, and then vacuum dried to obtain deodorizing capsule 5.

[0030] The mass ratio of polyvinyl alcohol to tea tree oil is 2:3, and the mass ratio of tea tree oil to emulsifier is 1:0.05.

[0031] The above-described method for preparing the deodorizing absorbent core of Examples 1-4 includes the following steps: placing the middle absorbent core 2 on the lower absorbent core 3, filling the receiving groove 4 with the deodorizing capsule 5 at an addition amount of 100g / m², placing the upper absorbent core 1 on the middle absorbent core 2, wrapping the upper absorbent core 1, middle absorbent core 2 and lower absorbent core 3 simultaneously with the wrapping layer 6, and fixing the absorbent core into one piece using ultrasonic welding, avoiding the receiving groove 4 during ultrasonic welding.

[0032] This invention utilizes odor-removing capsules 5 to eliminate odors from the absorbent core. Specifically, polyvinyl alcohol is used as the outer material, and tea tree oil is used as the core material. The polyvinyl alcohol encapsulates the tea tree oil to form the odor-removing capsules 5. The odor-removing capsules 5 are placed inside the absorbent core in the upper layer, not exposed on the surface of the absorbent core, yet able to quickly come into contact with menstrual blood. The outer material, polyvinyl alcohol, is water-soluble. When the odor-removing capsules 5 come into contact with menstrual blood, the outer material melts, exposing the tea tree oil inside. On the one hand, the tea tree oil can quickly mask the rusty smell of menstrual blood; on the other hand, the tea tree oil has a good antibacterial effect, which can effectively inhibit bacterial growth and further prevent the appearance of decomposition odors.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall fall within the protection scope of the present invention.

Claims

1. A water-absorbing core with deodorizing function, characterized in that, It includes a wrapping layer and an upper absorbent core, a middle absorbent core, and a lower absorbent core that are wrapped together by the wrapping layer. The middle absorbent core is located between the upper absorbent core and the lower absorbent core. The thickness of the upper absorbent core is 1 / (2-3) of the thickness of the middle absorbent core, and the thickness of the lower absorbent core is (1.5-2) times the thickness of the middle absorbent core. The middle absorbent core has a receiving groove, and the receiving groove is filled with a deodorizing capsule. The deodorizing capsule is made of polyvinyl alcohol encapsulating tea tree essential oil. The polyvinyl alcohol material of the deodorizing capsule is soluble in water.

2. The water-absorbing core with deodorizing function according to claim 1, characterized in that, There are at least two receiving channels, which are opened along the length of the water-absorbing core.

3. The water-absorbing core with deodorizing function according to claim 1, characterized in that, The method for preparing the deodorizing capsule includes the following steps: S1. Dissolve polyvinyl alcohol in deionized water to prepare a polyvinyl alcohol aqueous solution; S2. Add tea tree oil and emulsifier to a polyvinyl alcohol aqueous solution, stir and emulsify to obtain an oil-in-water emulsion; S3. Sodium sulfate solution is added dropwise to an oil-in-water emulsion to form microcapsules, which are then washed and dried to obtain the deodorizing capsules.

4. The water-absorbing core with deodorizing function according to claim 3, characterized in that, The mass ratio of the polyvinyl alcohol to the tea tree oil is 1:(1-1.5).

5. The water-absorbing core with deodorizing function according to claim 3, characterized in that, The polyvinyl alcohol aqueous solution has a mass fraction of 4-5%.

6. The water-absorbing core with deodorizing function according to claim 3, characterized in that, The emulsifier is Tween-80, and the mass ratio of the tea tree oil to the emulsifier is 1:(0.04-0.06).

7. The water-absorbing core with deodorizing function according to claim 3, characterized in that, In steps S2 and S3, the preparation temperature is 35-40℃.

8. The water-absorbing core with deodorizing function according to claim 1, characterized in that, The deodorizing capsules have a particle size of 30-60 μm.

9. The water-absorbing core with deodorizing function according to claim 1, characterized in that, The thickness of the absorbent core is 3-5mm.

10. A method for preparing a water-absorbing core with deodorizing function according to any one of claims 1-9, characterized in that, The process includes the following steps: placing the middle absorbent core on the lower absorbent core, filling the deodorizing capsule into the receiving groove, placing the upper absorbent core on the middle absorbent core, wrapping the upper absorbent core, the middle absorbent core, and the lower absorbent core simultaneously with a wrapping layer, and fixing the absorbent core into a single unit using ultrasonic welding.

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