A sanitary napkin absorbent core and preparation method thereof

Abstract

A sanitary napkin absorbent core and a preparation method thereof, the absorbent core is a film structure provided with permeable holes; the raw materials of the absorbent core include the following components by mass: 10-20 parts of modified acrylic resin, 10-20 parts of water-absorbing resin, 40-80 parts of acrylate, 5-20 parts of auxiliary agent, and 100-200 parts of solvent; wherein the modified acrylic resin is obtained by reacting acrylic acid, alkylphenol polyoxyethylene ether, acrylate monomer, acrylamide and filler; the filler is modified by a silane coupling agent. The sanitary napkin absorbent core provided by the present invention is composed of modified acrylic resin, water-absorbing resin and other components, effectively improves the liquid storage effect of the product, has both good water absorption performance and high water absorption rate, overcomes the deficiencies in the prior art, and has good application prospects.

Description

Technical Field

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

[0002] Sanitary napkins are an indispensable product for women during their menstrual period. They are usually composed of a surface layer, an absorbent layer and a waterproof bottom layer. They are generally made of soft, breathable non-woven fabric as the surface layer, and a polymer material as the absorbent layer to achieve the function of efficiently absorbing liquids. Existing sanitary napkin products are not only hygienic but also easy 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 super absorbent resin as the absorption layer material, which improves the absorption effect. However, during use, there are still problems such as low absorption rate and back leakage, which seriously affect the use of sanitary napkins and cause trouble for consumers. There are also technical solutions that use the method of adding a liquid storage layer to enhance the leakage prevention effect, but the addition of additional structures will make the manufacturing process more complicated 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 existing in the existing technology and meet the market and consumer needs. Summary of the invention

[0005] Based on this, the present invention provides a sanitary napkin absorbent core and a preparation method thereof. The sanitary napkin absorbent core provided by the present invention is composed of modified acrylic resin, water-absorbent resin and other components, wherein the modified acrylic resin is obtained by reacting acrylic acid, alkylphenol polyoxyethylene ether, acrylate monomer, acrylamide and filler, effectively improving the liquid storage effect of the product, having both good water absorption performance and high water absorption rate, overcoming the shortcomings of the prior art, and having good application prospects.

[0006] One object of the present invention is to provide a sanitary napkin absorbent core, wherein the absorbent core is a film structure provided with permeable holes;

[0007] The raw materials of the absorbent core include the following components in parts by weight:

[0008]

[0009] in,

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

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

[0012] Furthermore, the acrylate monomer is selected from one or more of alkyl acrylates, alkyl methacrylates, and multifunctional acrylates.

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

[0014] Furthermore, the auxiliary agent is selected from one or more of a cross-linking agent, a dispersant, an emulsifier, an initiator, a photoinitiator, a defoaming agent, and an antibacterial agent.

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

[0016] Furthermore, the pore size of the permeable pore is 60-130 μm.

[0017] Another object of the present invention is to provide a method for preparing the above-mentioned sanitary napkin absorbent core, the method for preparing the sanitary napkin absorbent core comprising the following steps:

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

[0019] S2, mixing the intermediate product 2, acrylate monomer, acrylamide, filler, crosslinking agent, initiator, emulsifier, and solvent, and heating them under an inert gas atmosphere to react to obtain a modified acrylic resin;

[0020] S3, mixing the modified acrylic resin, water-absorbing resin, acrylate, additives, and solvent to obtain an emulsion;

[0021] S4. Apply the emulsion to the surface of the cloth, react under light conditions, and then treat with steam, dehydrate and dry to obtain the absorbent core of the sanitary napkin.

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

[0023] Furthermore, in step S2, the heating reaction temperature is 60-100°C and the time is 2-6h.

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

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

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

[0027] The sanitary napkin absorbent core provided by the present invention 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 first uses acrylic acid and alkylphenol polyoxyethylene ether to react to obtain an intermediate product 1 with double bonds, and then undergoes a polymerization reaction to obtain an intermediate product 2, which is a polymer with alkylphenol polyoxyethylene ether as a branched chain. The intermediate product 2 is applied to the subsequent polymerization process of components such as acrylic ester monomers. On the one hand, the emulsification effect of the reaction system is improved, and the reactants are more evenly dispersed, thereby improving the reaction efficiency; on the other hand, the component can be introduced into the modified acrylic resin through a crosslinking agent, and the alkylphenol polyoxyethylene ether chain segment has the function of improving the flexibility of the absorbent core, and the mutual entanglement between the long branches is also conducive to promoting the formation of pores and improving the capillary absorption of liquids. In addition, the hydrophilic ethoxy chain segment further improves the absorption efficiency and storage and fixation capabilities of blood. At the same time, the modified acrylic resin of the present invention also uses multifunctional acrylate and silica modified by KH570 as raw materials, so that the modified acrylic resin has a more three-dimensional and dense network structure, enhances the conduction and absorption capacity of blood, and gives the sanitary napkin the excellent performance of efficient absorption, lasting dryness, and leakage prevention. DETAILED DESCRIPTION

[0028] In order to more clearly illustrate the technical solution of the present invention, the following examples are listed. Unless otherwise stated, the raw materials, reactions and post-treatment methods shown in the examples are common raw materials on the market and technical methods well known to those skilled in the art.

[0029] The words "preferred", "preferably", "more preferably", etc. in the present invention refer to embodiments of the present invention that can provide certain beneficial effects in certain circumstances. However, other embodiments may also be preferred under the same circumstances or other circumstances. In addition, the description of one or more preferred embodiments does not imply that other embodiments are not applicable, nor is it intended to exclude other embodiments from the scope of the present invention.

[0030] It should be understood that, except in any operating examples, or where otherwise indicated, all numbers indicating, for example, the amounts of ingredients used in the specification and claims should be understood to be modified in all cases by the term "about". Therefore, unless indicated to the contrary, the numerical parameters set forth in the following specification and the appended claims are approximate values ​​that vary depending on the desired properties to be obtained by the present invention.

[0031] The water-absorbing resin in the embodiment of the present invention is sodium polyacrylate water-absorbing resin purchased from Zhongshan Saipu Technology Co., Ltd.

[0032] The cross-linking agent in the embodiment of the present invention is N,N-methylenebisacrylamide.

[0033] The emulsifier in the embodiment of the present invention is dioctadecyl dimethyl ammonium bromide.

[0034] The initiator in the embodiment of the present invention is azobisisobutylamidine hydrochloride.

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

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

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

[0038] Using ethanol and water in a volume ratio of 1:1 as solvent, adding silica and KH570 in a mass ratio of 1:1.5, reacting at 50°C for 24 hours, filtering, washing and drying to obtain a filler.

[0039] The "parts" in the embodiments of the present invention refer to parts by mass.

[0040] Example 1

[0041] A sanitary napkin absorbent core, the absorbent core is a film structure provided with permeable holes, the aperture of the permeable holes is 60-130 μm;

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

[0043]

[0044] The preparation method of the above-mentioned sanitary napkin absorbent core comprises 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 and 0.06wt% of hydroquinone, reacting at 90°C for 6h under a vacuum degree of 0.03MPa, and then removing excess acrylic acid by reduced pressure distillation to obtain an intermediate product 1;

[0046] The intermediate product 1 and water in a mass ratio of 1:2 were mixed, and ammonium persulfate (2 wt% of the intermediate product) was added under stirring at 60° C., and the mixture was reacted at 85° C. for 3 h. After cooling and standing, the lower layer of liquid was separated to obtain the intermediate product 2;

[0047] S2, mixing 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 azobisisobutylamidine hydrochloride, 1 part of dioctadecyldimethylammonium bromide and 80 parts of water, reacting under a nitrogen atmosphere at 70° C. for 3 hours, centrifuging and drying to obtain a modified acrylic resin;

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

[0049] S4, the emulsion is applied to the upper and lower surfaces of the non-woven fabric, with a thickness of 1.5 mm, and then the wavelength is 450 nm and the intensity is 50 mW / cm 2 The absorbent core is irradiated with light for 180 seconds, and then placed in a steam tunnel oven for curing for 5 minutes. After dehydration, drying and cutting, the absorbent core is obtained.

[0050] Example 2

[0051] A sanitary napkin absorbent core, the absorbent core is a film structure provided with permeable holes, the aperture of the permeable holes is 60-130 μm;

[0052] The raw materials of the absorbent core include the following components in parts by weight:

[0053]

[0054]

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

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

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

[0058] S2, mixing 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 azobisisobutylamidine hydrochloride, 1 part of dioctadecyldimethylammonium bromide and 80 parts of water, reacting under a nitrogen atmosphere at 70° C. for 3 hours, centrifuging and drying to obtain a modified acrylic resin;

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

[0060] S4, the emulsion is applied to the upper and lower surfaces of the non-woven fabric, with a thickness of 1.5 mm, and then the wavelength is 450 nm and the intensity is 50 mW / cm 2 The absorbent core is irradiated with light for 180 seconds, and then placed in a steam tunnel oven for curing for 5 minutes. After dehydration, drying and cutting, the absorbent core is obtained.

[0061] Example 3

[0062] A sanitary napkin absorbent core, the absorbent core is a film structure provided with permeable holes, the aperture of the permeable holes is 60-130 μm;

[0063] The raw materials of the absorbent core include the following components in parts by weight:

[0064]

[0065]

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

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

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

[0069] S2, mixing 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 azobisisobutylamidine hydrochloride, 1 part of dioctadecyldimethylammonium bromide and 80 parts of water, reacting under a nitrogen atmosphere at 70° C. for 3 hours, centrifuging and drying to obtain a modified acrylic resin;

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

[0071] S4, the emulsion is applied to the upper and lower surfaces of the non-woven fabric, with a thickness of 1.5 mm, and then the wavelength is 450 nm and the intensity is 50 mW / cm 2 The absorbent core is irradiated with light for 180 seconds, and then placed in a steam tunnel oven for curing for 5 minutes. After dehydration, drying and cutting, the absorbent core is obtained.

[0072] Comparative Example 1

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

[0074] Comparative Example 2

[0075] A sanitary napkin absorbent core. The difference between this comparative example and Example 1 is that in the preparation method of the sanitary napkin absorbent core, step S1 only prepares intermediate product 1, and in step S2, intermediate product 2 is replaced by intermediate product 1 of equal mass, and other ingredients and preparation methods are the same as those in Example 1.

[0076] Comparative Example 3

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

[0078] Test Case

[0079] A performance comparison test was performed on Examples 1-3 and Comparative Examples 1-3.

[0080] Test method: GB / T14207-2008 is 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] project Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Artificial menstrual blood penetration time (s) 5.37 5.46 5.26 7.34 6.57 8.68 Artificial menstrual blood backflow volume (g) 0.50 0.52 0.49 1.67 0.98 2.75 Water absorption (g) 55.3 54.8 55.6 48.4 50.6 46.5

[0084] According to Table 1, it can be concluded that the sanitary napkin absorbent core prepared by the embodiment of the present invention has a high absorption rate for blood and strong liquid storage performance, while the comparative examples 1-3 cannot obtain an ideal network absorption structure due to the replacement of acrylic acid-alkylphenol polyoxyethylene ether polymer or multifunctional acrylate in the modified acrylic resin, and the absorption rate and liquid storage capacity are significantly reduced, and the performance is relatively weak. In summary, the present invention solves the defects existing in the prior art and is of great significance to the further development of sanitary napkin products.

[0085] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0086] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A sanitary napkin absorbent core, characterized in that: The absorbent core is a film structure provided with permeable holes; The raw materials of the absorbent core include the following components in parts by mass: Modified acrylic resin 18 parts 15 parts of water-absorbing resin Isobutyl acrylate 55 parts 8 parts of crosslinking agent 1.5 parts of emulsifier 2 parts of initiator 2 parts of photoinitiator 150 parts water; in, The modified acrylic resin is obtained by reacting acrylic acid, alkylphenol polyoxyethylene ether, acrylate monomer, acrylamide and filler; The filler is modified by a silane coupling agent; The preparation method of the above-mentioned sanitary napkin absorbent core comprises the following steps: S1, mixing alkylphenol polyoxyethylene ether and acrylic acid in a mass ratio of 5:1, adding 3 wt% of p-toluenesulfonic acid and 0.06 wt% of hydroquinone, reacting at 90° C. for 6 h under a vacuum degree of 0.03 MPa, and then removing excess acrylic acid by reduced pressure distillation to obtain an intermediate product 1; The intermediate product 1 and water in a mass ratio of 1:2 were mixed, and 2 wt% of ammonium persulfate of the intermediate product 1 was added under stirring at 60° C., and the mixture was reacted at 85° C. for 3 h. After cooling and standing, the lower layer of liquid was separated to obtain the intermediate product 2; 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 azobisisobutylamidine hydrochloride, 1 part of dioctadecyldimethylammonium bromide and 80 parts of water were mixed, reacted at 70° C. in a nitrogen atmosphere for 3 h, centrifuged and dried to obtain a modified acrylic resin; S3, mixing the modified acrylic resin and other ingredients according to the above mass fractions to obtain an emulsion; S4, the emulsion is applied to the upper and lower surfaces of the non-woven fabric, with a thickness of 1.5 mm, and then the wavelength is 450 nm and the intensity is 50 mW / cm 2 The absorbent core is irradiated with light for 180 s, and then placed in a steam tunnel oven for curing for 5 min. After dehydration, drying and cutting, the absorbent core is obtained.

2. The sanitary napkin absorbent core according to claim 1, characterized in that: The silane coupling agent is an acrylate-based silane coupling agent.

3. The sanitary napkin absorbent core according to claim 1, characterized in that: The pore size of the permeable pore is 60-130 μm.

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