Super-absorbent gel for sanitary nursing pad and preparation method of super-absorbent gel

Abstract

The invention relates to the technical field of sanitary nursing pads, in particular to super-absorbent gel for a sanitary nursing pad and a preparation method thereof.The super-absorbent gel for the sanitary nursing pad comprises the super-absorbent gel and a mold, flow guide grooves are formed in the surface of the super-absorbent gel at equal intervals, and through grooves are formed in the super-absorbent gel; one end of the through groove is a wide opening, and the other end of the through groove is provided with a narrow opening; by adding the auxiliary flow guide water absorption structure and utilizing a flow guide mode, the effect of assisting downward and inward flow guide water absorption is achieved while rapid water absorption is achieved, the structure is simple, meanwhile, the contact area with liquid can be increased, the water absorption efficiency can be improved, the utilization rate of superabsorbent gel accumulated in the sanitary nursing pad can be improved, and therefore the use effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of sanitary care pads, and in particular to a super absorbent gel for sanitary care pads and a preparation method thereof. Background Art

[0002] Sanitary care pads are disposable sanitary products, mainly suitable for infants, mothers and adults. Sanitary care pads are mainly used to prevent liquid leakage and keep the bed or the user's body contact surface dry. They are usually used in postpartum care, incontinence care, long-term bedridden patient care and other scenarios. For example, mothers will have lochia discharge after delivery. Using sanitary care pads can prevent lochia from soiling the sheets, making it easy to change and keep clean. For incontinent patients, whether it is caused by urinary incontinence due to aging or other physical reasons, the care pad can absorb urine in time and reduce odor and discomfort. The water absorption of the sanitary care pad mainly depends on its internal absorption layer. The main components of the absorption layer are highly absorbent materials and fluff pulp. Super absorbent gel is one of the highly absorbent materials. Superabsorbent hydrogels (SAHs) refer to cross-linked three-dimensional hydrophilic network polymers that can absorb and retain large amounts of water without dissolving. Superabsorbent hydrogels have outstanding water absorption properties and are therefore widely used in various industries such as chemical, material, pharmaceutical, environmental and food industries in huge quantities.

[0003] At present, when using super absorbent gel, there is a lack of auxiliary diversion and water absorption structure. Usually, when using the super absorbent gel on a sanitary care pad, due to the accumulation of gel in the actual water absorption process, the upper absorbent gel quickly absorbs water to form a gel, which makes it difficult for the infiltrated water to flow downward and contact the lower absorbent gel, which not only affects the utilization rate of the super absorbent gel, but also causes the water absorption capacity of the sanitary care pad to deteriorate. Therefore, a super absorbent gel for a sanitary care pad and a preparation method thereof are proposed to increase an auxiliary diversion and water absorption structure. By means of diversion, while absorbing water quickly, it plays an effect of assisting the downward and inward diversion and absorption of water. The structure is simple, and the contact area with the liquid can be increased, the water absorption efficiency can be accelerated, and the utilization rate of the super absorbent gel accumulated in the sanitary care pad can be improved, thereby improving the use effect. Summary of the invention

[0004] In view of the problems in the prior art, the present invention provides a super absorbent gel for sanitary care pads and a preparation method thereof, so that while absorbing water quickly, it can also assist in directing the absorption of water downward and inward, thereby improving the use effect.

[0005] The technical solution adopted by the present invention to solve the technical problem is a super absorbent gel for sanitary care pads and a preparation method thereof, comprising a super absorbent gel and a mold, wherein the surface of the super absorbent gel is provided with flow guide grooves at equal intervals, and a through groove is provided inside the super absorbent gel; One end of the through slot is a wide opening, and the other end of the through slot is provided with a narrow opening.

[0006] By adopting the above technical scheme, super absorbent gel, diversion grooves, through grooves, wide mouths and narrow mouths can increase auxiliary diversion and water absorption structures. By utilizing the diversion method, not only can the contact area between the super absorbent gel and the liquid be increased to accelerate the water absorption speed, but it can also assist in diverting the unabsorbed liquid to penetrate downward, thereby facilitating the improvement of the utilization rate of the super absorbent gel in the lower layer and avoiding the accumulation of gel on the top affecting the absorption effect of the lower layer.

[0007] Specifically, the mold includes a shell, and mold cavities are equidistantly formed in the shell, and the mold cavities are interconnected.

[0008] By adopting the above technical solution, the shell and the mold cavity can shape the generated super absorbent gel through the mold, so as to improve the water absorption speed and use effect of the super absorbent gel during actual use.

[0009] Specifically, a convex block is arranged on one side of the housing located at the mold cavity, and a convex strip is arranged on the surface of the housing located at the mold cavity.

[0010] By adopting the above technical solution, it is easy to splice and combine into two groups of opposite cones, so that a cylindrical through groove is formed inside the super absorbent gel, which is beneficial to increase the contact area between the super absorbent gel and the liquid and improve the water absorption speed. The combination of the convex strips is convenient for forming a guide groove on the outer surface of the super absorbent gel.

[0011] Specifically, a feeding port is provided on the top of the shell, and the feeding port includes a sealing cover.

[0012] By adopting the above technical solution, the feeding port and the sealing cover facilitate the injection of the super absorbent gel into the mold shell to perform freeze-drying molding.

[0013] Specifically, the guide groove is annular in shape, and the super absorbent gel is cylindrical in shape.

[0014] By adopting the above technical solution, the annular guide groove facilitates the partial unabsorbed liquid entering the sanitary care pad to penetrate downward downstream, avoiding accumulation on the top surface to form a barrier structure, which affects the utilization rate of the lower layer super absorbent gel. The cylindrical super absorbent gel can make the inside and outside contact with the liquid synchronously, and absorb water for it, thereby increasing the water absorption speed, reducing liquid leakage of the sanitary care pad, and improving the use effect and quality of the sanitary care pad.

[0015] Specifically, the shell is composed of four parts spliced ​​together, and the mold cavity is cylindrical.

[0016] By adopting the above technical solution, the shells are combined and spliced, so that the super absorbent gel after freeze drying can be formed in one piece, and the subsequent crushing into particles is convenient. The cylindrical mold cavity can shape the super absorbent gel after freeze drying.

[0017] Specifically, the specific preparation steps are as follows: Step 1: Making water-absorbent polymer fibers: taking a water-absorbent polymer and mixing the solvent to form a spinning solution with a concentration of -%, and then feeding the mixture into a spinning machine, the spinning solution is extruded through a spinneret and then enters a coagulation bath, in which the solvent and non-solvent are exchanged to coagulate the water-absorbent polymer solution into fibers; Step 2: Making natural polysaccharides: Refining of cellulose: Treating the carboxymethyl cellulose raw material with alkali and acid to remove impurities and obtain refined cellulose; Alkalization: the obtained refined cellulose is subjected to an alkalization reaction with a sodium hydroxide solution in an organic solvent to generate alkali cellulose; Etherification: The obtained alkali cellulose is subjected to etherification reaction with chloroacetic acid in an organic solvent to produce carboxymethyl cellulose; Neutralization: neutralize the etherified product with acid to neutrality; Washing: Wash the neutralized product with a mixture of alcohol and water to remove impurities; Drying: Drying the washed product to obtain the finished carboxymethyl cellulose; Step 3: Blending and cross-linking reaction: put the absorbent polymer fiber and the natural polysaccharide into a constant temperature reactor, inject an alkaline aqueous solution, stir to fully dissolve and mix them, then add a cross-linking agent into the reactor, and stir at a constant temperature of ℃ for minutes, then increase the temperature in the constant temperature reactor to ℃ and keep the temperature for reaction for hours, then take it out and wash it; Step 4: Drying and molding: Take the mixture obtained by the cross-linking reaction and washing and add it into the mold shell after the assembly and fixation is completed through the feeding port, fill the connected mold cavity, and then freeze-dry it to obtain a super absorbent gel; Step 5: Crushing and molding: Take the freeze-dried mold, separate its four shells, and put the obtained super absorbent gel into a grinder for crushing and molding.

[0018] By adopting the above technical scheme, the absorbent polymer fibers and natural polysaccharides undergo a cross-linking reaction to generate a super absorbent gel, which is then freeze-dried and formed using a mold to obtain a preliminary shape, and finally cut and crushed by a grinder to form the super absorbent gel into particles, so that it can come into contact with liquid and absorb water during the use of the sanitary care pad.

[0019] Specifically, the water-absorbing polymer is a polysaccharide polymer, and the polysaccharide polymer is selected from alginate.

[0020] By adopting the above technical solution, the polysaccharide polymer can be easily cross-linked with the natural polysaccharide carboxymethyl cellulose to form a super absorbent gel.

[0021] Specifically, the alkaline aqueous solution is a sodium hydroxide aqueous solution, and the cross-linking agent is epichlorohydrin.

[0022] By adopting the above technical solution, the alkaline aqueous solution can fully dissolve and mix the water-absorbent polymer fibers and the natural polysaccharide, and the cross-linking agent facilitates the cross-linking reaction of the dissolved solution.

[0023] Beneficial effects of the present invention: The super absorbent gel for sanitary care pads and the preparation method thereof described in the present invention can increase auxiliary diversion and water absorption structures through super absorbent gel, diversion grooves and through grooves, and utilize surface and internal diversion methods to not only increase the contact area with the liquid and improve the water absorption speed, but also play an auxiliary diversion effect, so that the liquid to be absorbed can penetrate downward to the super absorbent gel in the lower layer, and the super absorbent gel after water absorption can be prevented from forming a barrier structure, so that the liquid stays on the surface and affects the use effect of the super absorbent gel in the lower layer, thereby improving the use rate of the super absorbent gel in the sanitary care pad and improving the water absorption quality and use effect of the sanitary care pad. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the cross-sectional structure of the super absorbent gel of the present invention; Figure 3 It is a schematic diagram of the mold structure of the present invention; Figure 4 It is a schematic diagram of the cross-sectional structure of the mold of the present invention; In the figure: 1. super absorbent gel; 101. guide groove; 102. through groove; 103. wide mouth; 104. narrow mouth; 2. mold; 201. shell; 202. mold cavity; 203. convex block; 204. convex strip; 205. feeding port; 206. sealing cover. DETAILED DESCRIPTION

[0026] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0027] In order to facilitate rapid water absorption, it can also assist in guiding water downward and inward, thereby improving the use effect. Figure 1-3As shown, a super absorbent gel for sanitary care pads and a preparation method thereof according to the present invention comprises a super absorbent gel 1 and a mold 2, wherein the surface of the super absorbent gel 1 is provided with flow guide grooves 101 at equal intervals, and a through groove 102 is provided inside the super absorbent gel 1; One end of the through slot 102 is a wide opening 103 , and the other end of the through slot 102 is provided with a narrow opening 104 .

[0028] When in use, an auxiliary diversion and water absorption structure can be added through the super absorbent gel 1, the diversion groove 101, the through groove 102, the wide mouth 103 and the narrow mouth 104. The diversion method can not only increase the contact area between the super absorbent gel 1 and the liquid and accelerate the water absorption speed, but also play an effect of assisting in diverting the unabsorbed liquid to penetrate downward, thereby facilitating the improvement of the utilization rate of the super absorbent gel 1 in the lower layer and avoiding the accumulation of gel on the top affecting the absorption effect of the lower layer.

[0029] In order to improve the completeness of practical use, exemplary, such as Figure 3 , Figure 4 As shown, the present invention also includes that the mold 2 includes a shell 201, and mold cavities 202 are evenly spaced in the shell 201, and the mold cavities 202 are interconnected.

[0030] When in use, the generated super absorbent gel 1 can be shaped by a mold through the shell 201 and the mold cavity 202, so as to improve the water absorption speed and use effect of the super absorbent gel 1 during actual use.

[0031] For example, Figure 4 As shown, the present invention further includes that a convex block 203 is provided on one side of the mold cavity 202 in the shell 201 , and a convex strip 204 is provided on the surface of the mold cavity 202 in the shell 201 .

[0032] When in use, the protrusions 203 are used to facilitate splicing and combining into two groups of opposite cones, so that a cylindrical through groove 102 is formed inside the super absorbent gel 1, which is beneficial to increase the contact area between the super absorbent gel 1 and the liquid and improve the water absorption speed. The combination of the convex strips 205 facilitates the formation of a guide groove 101 on the outer surface of the super absorbent gel 1.

[0033] For example, Figure 4 As shown, the present invention further includes that a feeding port 205 is opened on the top of the shell 201 , and the feeding port 205 includes a sealing cover 206 .

[0034] When in use, the super absorbent gel 1 is conveniently injected into the shell 201 of the mold 2 through the feeding port 205 and the sealing cover 206 to be freeze-dried and formed.

[0035] For example, Figure 1 , Figure 2 As shown, the present invention also includes that the guide groove 101 is annular in shape, and the super absorbent gel 1 is cylindrical in shape.

[0036] During use, the annular guide groove 101 facilitates the partial unabsorbed liquid entering the sanitary care pad to penetrate downward downstream, thereby avoiding accumulation on the top surface to form a barrier structure, which affects the utilization rate of the lower super absorbent gel 1. The cylindrical super absorbent gel 1 can make the inside and outside contact with the liquid synchronously, and absorb water from it, thereby increasing the water absorption speed, reducing liquid leakage of the sanitary care pad, and improving the use effect and quality of the sanitary care pad.

[0037] For example, Figure 4 As shown, the present invention also includes that the shell 201 is composed of four parts spliced ​​together, and the mold cavity 202 is cylindrical.

[0038] When in use, the shell 201 is combined and spliced ​​to facilitate the integrated molding of the freeze-dried super absorbent gel, and also facilitates the subsequent crushing into particles. The cylindrical mold cavity 202 can be used to mold the freeze-dried super absorbent gel 1.

[0039] For example, Figure 1-4 As shown, the present invention also includes the following specific preparation steps: Step 1: Making water-absorbent polymer fibers: Mix the water-absorbent polymer with a solvent to form a spinning solution with a concentration of 3-15%, and then feed the mixture into a spinning machine. After the spinning solution is extruded through a spinneret, it enters a coagulation bath. In the coagulation bath, the solvent and the non-solvent are exchanged to coagulate the water-absorbent polymer solution into fibers; Step 2: Making natural polysaccharides: Refining of cellulose: Treating the carboxymethyl cellulose raw material with alkali and acid to remove impurities and obtain refined cellulose; Alkalization: the obtained refined cellulose is subjected to an alkalization reaction with a sodium hydroxide solution in an organic solvent to generate alkali cellulose; Etherification: The obtained alkali cellulose is subjected to etherification reaction with chloroacetic acid in an organic solvent to produce carboxymethyl cellulose; Neutralization: neutralize the etherified product with acid to neutrality; Washing: Wash the neutralized product with a mixture of alcohol and water to remove impurities; Drying: Drying the washed product to obtain the finished carboxymethyl cellulose; Step 3: Blending and cross-linking reaction: Put the absorbent polymer fiber and the natural polysaccharide into a constant temperature reactor, inject an alkaline aqueous solution, stir to fully dissolve and mix, then add a cross-linking agent into the reactor, stir at a constant temperature of 30°C for 30 minutes, then raise the temperature in the constant temperature reactor to 80°C and keep the temperature for 2 hours, then take it out and wash it; Step 4: Drying and molding: The mixture obtained by the cross-linking reaction and washing is added into the housing 201 of the mold 2 after the assembly and fixation is completed through the feeding port 205, filling the inside of the connected mold cavity 202, and then freeze-drying it to obtain the super absorbent gel 1; Step 5: Crushing and molding: Take the freeze-dried mold, separate the four shells 1, and put the obtained super absorbent gel 1 into a grinder for crushing and molding.

[0040] When in use, the super absorbent gel 1 can be generated through a cross-linking reaction between the absorbent polymer fibers and the natural polysaccharide, which is then freeze-dried and formed into a preliminary shape through a mold, and finally cut and crushed by a grinder to form the super absorbent gel 1 into particles, so that the sanitary care pad 1 can come into contact with liquid and absorb water during use.

[0041] For example, Figure 1 As shown, the present invention also includes that the water-absorbing polymer is a polysaccharide polymer, and the polysaccharide polymer is selected from alginate.

[0042] When in use, the polysaccharide polymer is conveniently cross-linked with the natural polysaccharide carboxymethyl cellulose to form a super absorbent gel 1.

[0043] For example, Figure 1 As shown, the present invention also includes that the alkaline aqueous solution is a sodium hydroxide aqueous solution, and the cross-linking agent is epichlorohydrin.

[0044] When in use, the water-absorbent polymer fibers and the natural polysaccharide can be fully dissolved and mixed by an alkaline aqueous solution, and the cross-linking agent can facilitate the cross-linking reaction of the dissolved solution.

[0045] When the present invention is used, alginic acid is first mixed with a solvent to form a spinning solution with a concentration of 3-15%, and then the solution is sent to a spinning machine. After the spinning solution is extruded through a spinneret, it enters a coagulation bath. In the coagulation bath, the solvent and the non-solvent are exchanged to coagulate the water-absorbent polymer solution into fibers. Then, the carboxymethyl cellulose raw material is treated with alkali solution and acid, and after removing impurities, the obtained refined cellulose is subjected to an alkalization reaction with a sodium hydroxide solution in an organic solvent to generate alkali cellulose. Then, the obtained alkali cellulose is subjected to an etherification reaction with chloroacetic acid in an organic solvent to generate carboxymethyl cellulose. The solution is neutralized to neutrality, and the neutralized product is used. The alcohol-water mixture is washed and dried to obtain a carboxymethyl cellulose product, and then the obtained absorbent polymer fiber and natural polysaccharide are placed in a constant temperature reactor, and then an alkaline aqueous solution is injected to fully dissolve and mix them by stirring, and then a cross-linking agent is added to the reactor, and the mixture is stirred at a constant temperature of 30° C. for 30 minutes. The temperature in the constant temperature reactor is raised to 80° C. and the temperature is maintained for 2 hours, and then the mixture is taken out and washed, and the mixture obtained by washing is injected into a mold 2 and freeze-dried to obtain a super absorbent gel 1. Before being actually used in a sanitary care pad, the super absorbent gel 1 needs to be placed in a grinder for crushing and molding. During actual use, liquid first penetrates into the sanitary care pad, contacts the super absorbent gel 1 laid on the upper layer, and quickly absorbs water from it. At the same time, part of the liquid flows into the through groove 102 through the wide mouth 103 and the narrow mouth 104, and the inner and outer surfaces of the super absorbent gel 1 are used for synchronous water absorption treatment, thereby increasing the contact area with the liquid and improving the water absorption efficiency. Moreover, part of the liquid can penetrate the super absorbent gel 1 laid on the upper layer through the guide groove 101 on the surface, enter the lower layer and contact the super absorbent gel 1, thereby playing an auxiliary diversion and water absorption effect, which can not only increase the water absorption speed of the super absorbent gel 1, but also increase the utilization rate of the super absorbent gel 1, and improve the use effect of the sanitary care pad.

[0046] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A super absorbent gel for sanitary care pads and a preparation method thereof, characterized in that: It comprises a super absorbent gel (1) and a mould (2), wherein the surface of the super absorbent gel (1) is provided with flow guide grooves (101) at equal intervals, and a through groove (102) is provided inside the super absorbent gel (1); One end of the through slot (102) is a wide opening (103), and the other end of the through slot (102) is provided with a narrow opening (104).

2. A super absorbent gel for sanitary care pads and a preparation method thereof according to claim 1, characterized in that: The mould (2) comprises a shell (201), wherein mould cavities (202) are arranged at equal intervals in the shell (201), and the mould cavities (202) are interconnected.

3. A super absorbent gel for sanitary care pads and a preparation method thereof according to claim 2, characterized in that: A convex block (203) is provided on one side of the housing (201) located in the mold cavity (202), and a convex strip (204) is provided on the surface of the housing (201) located in the mold cavity (202).

4. A super absorbent gel for sanitary care pads and a preparation method thereof according to claim 3, characterized in that: A feeding port (205) is provided on the top of the shell (201), and the feeding port (205) comprises a sealing cover (206).

5. A super absorbent gel for sanitary care pads and a preparation method thereof according to claim 4, characterized in that: The guide groove (101) is in an annular shape, and the super absorbent gel (1) is in a cylindrical shape.

6. A super absorbent gel for sanitary care pads and a preparation method thereof according to claim 5, characterized in that: The shell (201) is composed of four parts spliced ​​together, and the mold cavity (202) is in a cylindrical shape.

7. A super absorbent gel for sanitary care pads and a preparation method thereof according to any one of claims 1 to 6, characterized in that: The specific preparation steps are as follows: Step 1: Making water-absorbent polymer fibers: Mix the water-absorbent polymer with a solvent to form a spinning solution with a concentration of 3-15%, and then feed the mixture into a spinning machine. After the spinning solution is extruded through a spinneret, it enters a coagulation bath. In the coagulation bath, the solvent and the non-solvent are exchanged to coagulate the water-absorbent polymer solution into fibers; Step 2: Making natural polysaccharides: Refining of cellulose: Treating the carboxymethyl cellulose raw material with alkali and acid to remove impurities and obtain refined cellulose; Alkalization: the obtained refined cellulose is subjected to an alkalization reaction with a sodium hydroxide solution in an organic solvent to generate alkali cellulose; Etherification: The obtained alkali cellulose is subjected to etherification reaction with chloroacetic acid in an organic solvent to produce carboxymethyl cellulose; Neutralization: neutralize the etherified product with acid to neutrality; Washing: Wash the neutralized product with a mixture of alcohol and water to remove impurities; Drying: Drying the washed product to obtain the finished carboxymethyl cellulose; Step 3: Blending and cross-linking reaction: Put the absorbent polymer fiber and the natural polysaccharide into a constant temperature reactor, inject an alkaline aqueous solution, stir to fully dissolve and mix, then add a cross-linking agent into the reactor, stir at a constant temperature of 30°C for 30 minutes, then raise the temperature in the constant temperature reactor to 80°C and keep the temperature for 2 hours, then take it out and wash it; Step 4: Drying and molding: The mixture obtained by the cross-linking reaction and washing is added into the housing (201) of the mold (2) after the assembly and fixation is completed through the feeding port (205), filling the interior of the connected mold cavity (202), and then freeze-drying the mixture to obtain the super absorbent gel (1); Step 5: Crushing and molding: Take the freeze-dried mold, separate the four shells (1), and put the obtained super absorbent gel (1) into a crusher for crushing and molding.

8. The super absorbent gel for sanitary care pads and the preparation method thereof according to claim 7, characterized in that: The water-absorbing polymer is a polysaccharide polymer, and the polysaccharide polymer is selected from alginate.

9. A super absorbent gel for sanitary care pads and a preparation method thereof according to claim 8, characterized in that: The alkaline aqueous solution is a sodium hydroxide aqueous solution, and the cross-linking agent is epichlorohydrin.

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