Sanitary pad absorbent core body and preparation method therefor

Abstract

A sanitary pad absorbent core body and a preparation method therefor. The absorbent core body comprises: 10 wt% to 20 wt% of a modified acrylic resin, 10 wt% to 20 wt% of a water-absorbing resin, and 40 wt% to 80 wt% of an acrylate monomer, wherein the modified acrylic resin is obtained by means of a reaction of acrylic acid, alkylphenol polyoxyethylene ether, an acrylate monomer, acrylamide, and a filler, wherein the filler is modified by means of a silane coupling agent. The sanitary pad absorbent core body provided by the present invention consists of components such as a modified acrylic resin and a water-absorbing resin, so that the liquid storage effect of the product is effectively improved. Moreover, the sanitary pad absorbent core body has good water absorption performance and a relatively high water absorption rate, overcoming shortcomings in the prior art. The present invention has good application prospects.

Description

Sanitary napkin absorbent core and preparation method thereof TECHNICAL FIELD

[0001] The present application relates to the technical field of sanitary products, in particular to a sanitary napkin absorbent core and a preparation method thereof. BACKGROUND

[0002] Sanitary napkins are indispensable important products for women during the menstrual period. Sanitary napkins are usually composed of a surface layer, an absorbent layer and a waterproof bottom layer. Soft and breathable non-woven fabric is generally used as the surface layer, and then high molecular materials are used as the absorbent layer to realize the function of efficiently absorbing liquid. Existing sanitary napkin products are not only sanitary but also convenient to carry, and can be easily used at any time, effectively improving the quality of life of women during menstruation.

[0003] Traditional sanitary napkin products use superabsorbent resin as the absorbent layer material to improve the absorption effect, but during use, there are still problems such as low absorption rate and back seepage of liquid, which seriously affect the use effect of the sanitary napkin and cause trouble to consumers. There are also technical solutions that increase the liquid storage layer to enhance the leakage prevention effect, but the additional structure will make the manufacturing process more complex and the cost will also increase significantly.

[0004] In summary, there is an urgent need to develop a new technical solution to solve the problems in the prior art and meet the needs of the market and consumers. SUMMARY

[0005] Therefore, the present application provides a sanitary napkin absorbent core and a preparation method thereof. The sanitary napkin absorbent core provided by the present application is composed of modified acrylic resin and water-absorbing resin, etc. The modified acrylic resin is obtained by reacting acrylic acid, alkyl phenol polyoxyethylene ether, acrylic ester monomer, acrylamide and filler, which effectively improves the liquid storage effect of the product, has good water absorption performance and high water absorption rate, overcomes the deficiencies in the prior art, and has good application prospect.

[0006] An object of the present application is to provide a sanitary napkin absorbent core, wherein the absorbent core is a thin film structure provided with a permeation hole.

[0007] The raw materials of the absorbent core include the following components by mass fraction:

[0008]

[0009] Among them,

[0010] The modified acrylic resin is obtained by reacting acrylic acid, alkyl phenol polyoxyethylene ether, acrylic ester monomer, acrylamide and filler;

[0011] The filler is modified by a silane coupling agent.

[0012] Further, the acrylate monomer is selected from one or more of alkyl acrylate, alkyl methacrylate, multifunctional acrylate.

[0013] Further, the multifunctional acrylate is selected from one or more of trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate.

[0014] Further, the auxiliary agent is selected from one or more of crosslinking agent, dispersant, emulsifier, initiator, photoinitiator, antifoaming agent, antibacterial agent.

[0015] Further, the silane coupling agent is acrylate-based silane coupling agent.

[0016] Further, the pore size of the penetration hole is 60-130 μm.

[0017] Another object of the present application is to provide a preparation method of the sanitary napkin absorbent core, which comprises the following steps:

[0018] S1, mixing acrylic acid, alkylphenol polyoxyethylene ether, catalyst, polymerization inhibitor, vacuum heating reaction to obtain intermediate product 1; then adding the intermediate product 1 into water, adding initiator, heating and stirring to obtain intermediate product 2;

[0019] S2, mixing the intermediate product 2, acrylate monomer, acrylamide, filler, crosslinking agent, initiator, emulsifier, solvent, heating reaction in inert gas atmosphere to obtain modified acrylic resin;

[0020] S3, mixing the modified acrylic resin, water-absorbing resin, acrylate, auxiliary agent, solvent to obtain emulsion;

[0021] S4, coating the emulsion on the surface of cloth, reacting under light condition, then using steam treatment, dehydration, drying to obtain sanitary napkin absorbent core.

[0022] Further, in step S1, the temperature of the vacuum heating reaction is 80-100℃, and the time is 4-8h; the temperature of the heating and stirring reaction is 60-90℃, and the time is 3-6h.

[0023] Further, in step S2, the temperature of the heating reaction is 60-100℃, and the time is 2-6h.

[0024] Further, the filler is modified by silane coupling agent.

[0025] Further, the silane coupling agent is KH570.

[0026] The present application has the following beneficial effects:

[0027] The sanitary napkin absorbent core provided by the present application uses modified acrylic resin, water-absorbing resin and other components as raw materials, and overcomes the shortcomings of the prior art. The modified acrylic resin is first obtained by reacting acrylic acid with alkyl phenol polyoxyethylene ether to obtain an intermediate product 1 with a double bond, and then obtained by polymerization to obtain an intermediate product 2. This component is a polymer with alkyl phenol polyoxyethylene ether as a branched chain. When it is applied to the polymerization process of subsequent acrylic ester monomers and other components, on the one hand, the emulsification effect of the reaction system is improved, the reactants are more uniformly dispersed, and thus the reaction efficiency is improved; on the other hand, the component can be introduced into the modified acrylic resin through a crosslinking agent, the alkyl phenol polyoxyethylene ether chain segment has the function of improving the flexibility of the absorbent core, and the mutual entanglement between the long branched chains is also conducive to promoting the formation of pores, improving the capillary absorption of liquid, and further improving the absorption efficiency, storage and fixing capacity of blood. At the same time, the modified acrylic resin of the present application also uses multifunctional acrylic ester and silicon dioxide modified by KH570 as raw materials, so that the modified acrylic resin has a more three-dimensional and dense network structure, and the transmission and absorption capacity of blood is enhanced, and the sanitary napkin is endowed with excellent performance of high-efficiency absorption, long-lasting dryness and prevention of external leakage. DETAILED DESCRIPTION

[0028] In order to more clearly illustrate the technical solutions of the present application, the following examples are listed. The raw materials, reactions and post-treatment methods appearing in the examples are all common raw materials on the market and technical means familiar to those skilled in the art, unless otherwise stated.

[0029] The words "preferred", "preferably", "more preferred" and the like in the present application refer to the embodiments of the present application which can provide certain beneficial effects in certain cases. However, other embodiments can also be preferred in the same or other cases. In addition, the description of one or more preferred embodiments does not imply that other embodiments are not usable, nor is it intended to exclude other embodiments from the scope of the present application.

[0030] It should be understood that, except in any operational example or otherwise indicated, the use of amounts or all numbers expressing, for example, amounts of ingredients in the specification and claims are to be understood as being modified in all instances by the term "about". Therefore, unless indicated to the contrary, the numerical parameters set forth in the following specification and attached claims are approximations that can vary depending on the desired properties to be obtained by the present application.

[0031] The water-absorbing resin in the embodiments of the present application is a polyacrylic acid sodium water-absorbing resin, which is purchased from Zhongshan City Saip Technology Co., Ltd.

[0032] The crosslinking agent in the embodiment of the present application is N,N-methylenebisacrylamide.

[0033] The emulsifier in the embodiment of the present application is dioctadecyldimethylammonium bromide.

[0034] The initiator in the embodiment of the present application is azobisdimethylvaleronitrile.

[0035] The photoinitiator in the embodiment of the present application is 2-hydroxy-2-methyl-1-phenyl-1-propanone.

[0036] The alkylphenol polyoxyethylene ether in the embodiment of the present application is nonylphenol polyoxyethylene ether NP-10.

[0037] The filler in the embodiment of the present application is modified by a silane coupling agent, including the following steps:

[0038] The filler is obtained by adding silica and KH570 in a mass ratio of 1:1.5 to ethanol and water in a volume ratio of 1:1 as solvents, and then reacting at 50℃ for 24h, followed by filtration, washing, and drying.

[0039] The "parts" in the embodiment of the present application refer to mass parts.

[0040] Example 1

[0041] A sanitary napkin absorbent core, which is a film structure provided with a permeable hole, the pore size of the permeable hole being 60-130μm;

[0042] The raw materials of the absorbent core include the following components in mass parts:

[0043]

[0044] The preparation method of the above sanitary napkin absorbent core includes the following steps:

[0045] S1, mixing alkylphenol polyoxyethylene ether and acrylic acid in a mass ratio of 5:1, adding 3wt% of p-toluenesulfonic acid to the system and 0.06wt% of hydroquinone to the system, and then reacting at 90℃ under a vacuum degree of 0.03MPa for 6h, followed by removing excess acrylic acid by reduced pressure distillation to obtain intermediate product 1;

[0046] S2, mixing intermediate product 1 and water in a mass ratio of 1:2, stirring and adding ammonium persulfate (2wt% of the intermediate product) at 60℃, and then reacting at 85℃ for 3h, followed by cooling and standing, and then separating the lower liquid to obtain intermediate product 2;

[0047] S2, 5 parts of the intermediate product 2, 5 parts of trimethylolpropane trimethacrylate, 25 parts of isooctyl methacrylate, 5 parts of sodium acrylate, 5 parts of acrylamide, 5 parts of filler, 1 part of N, N-methylenebisacrylamide, 1 part of azobisdimethylammonium isobutyrate hydrochloride, 1 part of dioctadecyldimethylammonium bromide and 80 parts of water are mixed, and reacted at 70°C for 3h under a nitrogen atmosphere, and after centrifugation and drying, a modified acrylic resin is obtained;

[0048] S3, the modified acrylic resin and other ingredients are mixed in the above mass fractions to obtain an emulsion;

[0049] S4, the emulsion is coated on the upper and lower surfaces of the non-woven fabric, with a thickness of 1.5mm, then irradiated with light with a wavelength of 450nm and an intensity of 50mW / cm 2 for 180s, and then placed in a water vapor tunnel furnace for curing for 5min, and after dehydration, drying and slitting, the absorbent core is obtained.

[0050] Example 2

[0051] A sanitary napkin absorbent core, which is a film structure provided with a permeable hole, the pore size of the permeable hole being 60-130μm;

[0052] The raw materials of the absorbent core include the following components in mass fractions:

[0053]

[0054]

[0055] The preparation method of the above sanitary napkin absorbent core includes the following steps:

[0056] S1, alkylphenol polyoxyethylene ether and acrylic acid are mixed in a mass ratio of 5:1, 3wt% of p-toluenesulfonic acid is added to the system, and 0.06wt% of hydroquinone is added to the system, and reacted at 90°C for 6h under a vacuum degree of 0.03MPa, and then excess acrylic acid is removed by reduced pressure distillation to obtain an intermediate product 1;

[0057] The intermediate product 1 and water are mixed in a mass ratio of 1:2, and ammonium persulfate (2wt% of the intermediate product) is added under stirring at 60°C, and reacted at 85°C for 3h, and after cooling and standing, the lower liquid is separated to obtain an intermediate product 2;

[0058] S2, 5 parts of the intermediate product 2, 5 parts of trimethylolpropane trimethacrylate, 25 parts of isooctyl methacrylate, 5 parts of sodium acrylate, 5 parts of acrylamide, 5 parts of filler, 1 part of N, N-methylenebisacrylamide, 1 part of azobisdimethylammonium isobutyrate hydrochloride, 1 part of dioctadecyldimethylammonium bromide and 80 parts of water are mixed, and reacted at 70°C for 3h under a nitrogen atmosphere, and after centrifugation and drying, a modified acrylic resin is obtained;

[0059] S3, the modified acrylic resin and other ingredients are mixed in the above mass fractions to obtain an emulsion;

[0060] S4, the emulsion is coated on the upper and lower surfaces of the non-woven fabric, with a thickness of 1.5mm, then irradiated with light with a wavelength of 450nm and an intensity of 50mW / cm 2 for 180s, and then placed in a water vapor tunnel furnace for curing for 5min, and after dehydration, drying and slitting, the absorbent core is obtained.

[0061] Example 3

[0062] A sanitary napkin absorbent core, which is a film structure provided with a penetration hole, the penetration hole has a pore size of 60-130μm;

[0063] The raw materials of the absorbent core include the following components in mass fractions:

[0064]

[0065]

[0066] The preparation method of the above sanitary napkin absorbent core includes the following steps:

[0067] S1, alkylphenol polyoxyethylene ether and acrylic acid are mixed in a mass ratio of 5:1, 3wt% of p-toluenesulfonic acid is added to the system, and 0.06wt% of hydroquinone is added to the system, and reacted at 90°C for 6h under a vacuum degree of 0.03MPa, and then excess acrylic acid is removed by reduced pressure distillation to obtain an intermediate product 1;

[0068] The intermediate product 1 and water are mixed in a mass ratio of 1:2, and ammonium persulfate (2wt% of the intermediate product) is added under stirring at 60°C, and reacted at 85°C for 3h, and after cooling and standing, the lower liquid is separated to obtain an intermediate product 2;

[0069] S2, 5 parts of the intermediate product 2, 5 parts of trimethylolpropane trimethacrylate, 25 parts of isooctyl methacrylate, 5 parts of sodium acrylate, 5 parts of acrylamide, 5 parts of filler, 1 part of N, N-methylenebisacrylamide, 1 part of azobisdimethylamino propane hydrochloride, 1 part of dioctadecyl dimethyl ammonium bromide and 80 parts of water are mixed, and reacted at 70°C for 3h under a nitrogen atmosphere, and after centrifugation and drying, a modified acrylic resin is obtained;

[0070] S3, the modified acrylic resin and other ingredients are mixed in the above mass fractions to obtain an emulsion;

[0071] S4, the emulsion is coated on the upper and lower surfaces of the non-woven fabric, with a thickness of 1.5mm, then irradiated with light with a wavelength of 450nm and an intensity of 50mW / cm 2 for 180s, and then placed in a water vapor tunnel furnace for curing for 5min, and after dehydration, drying and slitting, the absorbent core body is obtained.

[0072] Comparative Example 1

[0073] A sanitary napkin absorbent core body, the difference between this comparative example and Example 1 is that in the preparation method of the sanitary napkin absorbent core body, step S1 is omitted, and in step S2, the intermediate product 2 is replaced with an equal amount of alkylphenol polyoxyethylene ether, and the other ingredients and preparation method are the same as in Example 1.

[0074] Comparative Example 2

[0075] A sanitary napkin absorbent core body, the difference between this comparative example and Example 1 is that in the preparation method of the sanitary napkin absorbent core body, only intermediate product 1 is prepared in step S1, and in step S2, the intermediate product 2 is replaced with an equal amount of intermediate product 1, and the other ingredients and preparation method are the same as in Example 1.

[0076] Comparative Example 3

[0077] A sanitary napkin absorbent core body, the difference between this comparative example and Example 1 is that in the preparation method of the sanitary napkin absorbent core body, in step S2, trimethylolpropane trimethacrylate is replaced with an equal amount of isooctyl methacrylate, and the other ingredients and preparation method are the same as in Example 1.

[0078] Test Example

[0079] Performance comparison tests were conducted on Examples 1-3 and Comparative Examples 1-3.

[0080] Test method: GB / T14207-2008 was used to test water absorption and blood absorption.

[0081] The test results are shown in Table 1.

[0082] Table 1: Absorption performance test results

[0083]

[0084] According to Table 1, it can be concluded that the sanitary napkin absorbent core prepared by the embodiment of the present application has high blood absorption rate and strong liquid storage performance. The comparative examples 1-3, due to the replacement of the acrylic-alkyl phenol polyoxyethylene ether polymer or multi-functional acrylic ester in the modified acrylic resin, result in that the absorbent core cannot obtain ideal network absorption structure, and the absorption rate and liquid storage capacity are significantly reduced, and the performance is relatively weak. In summary, the present application solves the defects in the prior art and has important significance for the further development of sanitary napkin products.

[0085] It will be apparent to those skilled in the art that the present application is not limited to the details of the above-exemplified embodiments, and that the present application can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and range of the equivalent elements of the claims are intended to be embraced therein.

[0086] Furthermore, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the present specification is described in this way only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A sanitary napkin absorbent core comprising: a. 10 to 20 wt% of a modified acrylic resin; b. 10 to 20 wt% of a water-absorbing resin; and c. 40 to 80 wt% of an acrylate monomer; wherein the modified acrylic resin is obtained by a reaction of acrylic acid, an alkylphenol polyoxyethylene ether, an acrylate monomer, an acrylamide, and a filler; wherein the filler is modified by a silane coupling agent.

2. The absorbent core according to claim 1, wherein the acrylate monomer is selected from one or more of an alkyl acrylate, an alkyl methacrylate, or a multifunctional acrylate.

3. The absorbent core according to claim 2, wherein the multifunctional acrylate is selected from one or more of trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, pentaerythritol triacrylate, or pentaerythritol tetraacrylate.

4. The absorbent core according to any one of the preceding claims, further comprising 5 to 20 wt% of an aid.

5. The absorbent core according to claim 4, further comprising a solvent.

6. The absorbent core according to claim 4 or 5, wherein the aid is selected from a crosslinking agent, a dispersing agent, an emulsifying agent, an initiator, a photoinitiator, an antifoaming agent, an antibacterial agent, or a combination thereof.

7. The absorbent core according to any one of the preceding claims, wherein the silane coupling agent is an acrylate-based silane coupling agent.

8. The absorbent core according to any one of the preceding claims, wherein the absorbent core comprises one or more penetration holes having a pore size of 60 to 130 pm.

9. A method of preparing the absorbent core according to any one of claims 1-8, wherein the method comprises the following steps: a. mixing acrylic acid, an alkylphenol polyoxyethylene ether, a catalyst, and a polymerization inhibitor, and performing a vacuum heating reaction to obtain an intermediate product 1; then adding the intermediate product 1 to water, adding an initiator, and performing a heating stirring reaction to obtain an intermediate product 2; b. mixing the intermediate product 2, an acrylate monomer, an acrylamide, and an emulsifying agent, and performing a heating reaction under an inert gas atmosphere to obtain a modified acrylic resin; c. mixing the modified acrylic resin, a water-absorbing resin, and an acrylate to obtain an emulsion; d. depositing the emulsion on a surface; e. exposing the emulsion to light treatment; f. placing the emulsion in a water vapor tunnel oven; and g. dehydrating and drying the emulsion to obtain the absorbent core.

10. The method according to claim 9, wherein in step (a), the temperature of the vacuum heating reaction is 80-100 °C, and the time is 4-8 hours.

11. The method according to any one of claims 9-10, wherein in step (a), the temperature of the heating stirring reaction is 60-90 °C, and the time is 3-6 hours.

12. The method according to any one of claims 9-11, wherein in step (b), the heating reaction is performed at a temperature of 60-100 °C for a time of 2-6 hours. ​ ​ 13. The method according to any one of claims 9-12, wherein in step (b) the intermediate product 2 is further mixed with a filler.

14. The method according to any one of claims 9-13, wherein in step (b) the intermediate product 2 is further mixed with a solvent.

15. The method according to any one of claims 9-14, wherein the emulsifier is dioctadecyldimethylammonium bromide.

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