Degradable antibacterial absorption core and preparation method thereof

Abstract

The invention relates to a degradable antibacterial absorption core body and a preparation method thereof. The degradable antibacterial absorption core body is prepared from the following raw materials in parts by mass: 30 to 50 parts of polylactic acid resin, 20 to 40 parts of water-absorbing antibacterial resin, 0.5 to 5 parts of auxiliaries and 10 to 50 parts of solvent, wherein the water-absorbing antibacterial resin is obtained by reaction of graphene, hydroxyl alkyl acrylate, polyether acrylate, acrylate and amino alkyl acrylate. The degradable antibacterial absorption core body provided by the invention takes the polylactic acid resin and the water-absorbing antibacterial resin as main components of the absorption layer, can effectively inhibit bacterium breeding and reduce peculiar smell, has good water-absorbing and liquid-storing performance, and meets the performance requirements of the market and customers on products. And meanwhile, the absorption core body product also has the characteristics of good biocompatibility and easiness in degradation, conforms to the green and sustainable social development concept, and has a good application prospect.

Description

Technical Field

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

[0002] Antibacterial absorbent cores are multifunctional composite materials widely used in hygiene products such as diapers, sanitary napkins, and medical pads. Conventional absorbent cores are composed of a superabsorbent resin and an antibacterial component. The superabsorbent resin rapidly absorbs and retains large amounts of liquid, while the antibacterial agent effectively reduces odor and infection risks by disrupting microbial cell structures. As a result, this product combines efficient liquid absorption, prevents reverse osmosis, and inhibits bacterial growth, making it suitable for sensitive skin and those with high hygiene requirements, making it a crucial component of healthcare products.

[0003] However, the antibacterial ingredients commonly used in antibacterial absorbent cores are anions or plant extracts, which have the problems of high price, complex preparation methods, and easy deterioration and failure, which limit the further promotion and application of antibacterial absorbent core products. In addition, although the absorbent cores currently on the market have improved in liquid absorption performance, they still have deficiencies in key indicators such as absorption speed and liquid storage capacity, making it difficult to achieve balanced optimization of various functions. In addition, the cores mainly made of acrylic polymer materials have poor biodegradability, making them difficult to dispose of after being discarded. This is significantly different from the environmental protection concept and sustainable development requirements advocated by today's society, and still has many defects.

[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 needs of the market and consumers. Summary of the Invention

[0005] Based on this, the present invention provides a degradable antibacterial absorbent core and a method for preparing the same. The degradable antibacterial absorbent core provided by the present invention, with polylactic acid resin and a water-absorbing antibacterial resin as the main components of the absorbent layer, can effectively inhibit bacterial growth and reduce odor, while also exhibiting excellent water absorption and liquid storage properties, thus meeting the performance requirements of the market and customers. Furthermore, the absorbent core product of the present invention also features good biocompatibility and easy degradation, conforming to the concept of green and sustainable social development and possessing promising application prospects.

[0006] One object of the present invention is to provide a degradable antibacterial absorbent core, wherein the raw materials of the degradable antibacterial absorbent core include the following components in parts by mass:

[0007]

[0008] in,

[0009] The water-absorbing and antibacterial resin is obtained by reacting graphene, hydroxyalkyl acrylate, polyether acrylate, acrylate and aminoalkyl acrylate.

[0010] Furthermore, the polylactic acid resin is obtained by reacting vinyl pyrrolidone, polyether acrylate and polylactic acid with terminal double bonds.

[0011] Furthermore, the auxiliary agent is selected from one or more of a plasticizer, a foaming agent, a surfactant, an antibacterial agent, an adhesive, and an antioxidant.

[0012] Furthermore, the solvent is water.

[0013] Another object of the present invention is to provide a method for preparing the above-mentioned degradable antibacterial absorbent core, the method comprising the following steps:

[0014] S1, mixing graphene and a silane coupling agent, heating and stirring to react, and obtaining pretreated graphene;

[0015] S2, mixing the pretreated graphene, hydroxyalkyl acrylate, polyether acrylate, acrylate, aminoalkyl acrylate, a crosslinking agent and an initiator, and heating the mixture under an inert gas atmosphere to obtain a water-absorbing and antibacterial resin;

[0016] S3. Evenly mix the water-absorbing antibacterial resin, polylactic acid resin and additives, lay them on the surface of the lower non-woven fabric, spray the solvent, lay the upper non-woven fabric, and dry them to obtain a degradable antibacterial absorption core.

[0017] Furthermore, the silane coupling agent is KH570 (γ-methacryloxypropyltrimethoxysilane).

[0018] Furthermore, the mass ratio of the pretreated graphene, hydroxyalkyl acrylate, polyether acrylate, acrylate, and aminoalkyl acrylate is (0.1-1):(1-2):(1-3):(2-5):(0.1-1).

[0019] Furthermore, in step S1, the temperature of the heating and stirring reaction is 50-100°C.

[0020] Furthermore, in step S2, the temperature of the heating reaction is 50-100°C.

[0021] Furthermore, the method further comprises: mixing vinyl pyrrolidone, polyether acrylate, double-bond-terminated polylactic acid, a crosslinking agent and an initiator, and heating the mixture under an inert gas atmosphere to react to obtain polylactic acid resin.

[0022] Furthermore, the mass ratio of the vinyl pyrrolidone, polyether acrylate, and terminal double-bond polylactic acid is (0.1-1):(1-2):(1-5).

[0023] Furthermore, the temperature of the heating reaction is 50-100°C.

[0024] Another object of the present invention is to provide the use of the above-mentioned degradable antibacterial absorbent core in sanitary napkins.

[0025] The present invention has the following beneficial effects:

[0026] The degradable antibacterial absorbent core provided by the present invention adopts polylactic acid resin and water-absorbing antibacterial resin as main components. The water-absorbing antibacterial resin first modifies graphene oxide to introduce active double bonds, and then copolymerizes with hydroxyalkyl acrylate, polyether acrylate, acrylate, and aminoalkyl acrylate to obtain a product. On the one hand, the component has a large number of hydrophilic groups, which ensures the water absorption of the material. On the other hand, it also contains a quaternary ammonium salt structure and has certain antibacterial properties. More importantly, the present invention introduces the new antibacterial component graphene oxide into the polymer, and inhibits bacteria and microorganisms through the multi-layer thin film structure of graphene and the induction of active oxygen. Under the coordination of cationic quaternary ammonium salt, the penetration and killing effect of bacteria are further enhanced, avoiding the addition of ingredients such as silver particles and plant extracts. In addition, the introduction of graphene into the water-absorbing resin can embed inorganic particles into the cross-linked network, thereby optimizing the pore structure of the resin, promoting the absorption and conduction function of liquid, and playing a multiple improvement role.

[0027] The present invention also obtains polylactic acid resin by reacting vinyl pyrrolidone, polyether acrylate and terminal double-bond polylactic acid. The polylactic acid resin not only has strong bioaffinity and is degradable, but also greatly improves the hydrophilic properties of polylactic acid. The introduction of vinyl pyrrolidone also gives the product better swelling and water retention effects, thereby improving its liquid storage capacity.

[0028] At the same time, the polylactic acid resin and the water-absorbing antibacterial resin of the present invention have a polyacrylate structure with similar polarity, wherein the long polyethylene glycol chain introduced by the polyether acrylate can be combined through physical entanglement and intermolecular forces, which is beneficial to improving the stability and strength of the absorbent core, and also ensures the water absorption capacity, and has excellent comprehensive performance. DETAILED DESCRIPTION

[0029] In order to more clearly illustrate the technical solutions of the present invention, the following examples are given. Unless otherwise stated, the raw materials, reactions and post-processing methods mentioned in the examples are common raw materials on the market and technical methods well known to those skilled in the art.

[0030] The terms "preferred," "preferably," "more preferred," and the like, used herein, refer to embodiments of the invention that may provide certain benefits under certain circumstances. However, other embodiments may also be preferred under the same or other circumstances. Furthermore, the recitation of one or more preferred embodiments does not imply that other embodiments are not useful, nor is it intended to exclude other embodiments from the scope of the invention.

[0031] It should be understood that, except in any operating examples, or where otherwise indicated, all numbers expressing, for example, quantities of ingredients used in the specification and claims are to be understood as being modified in all instances by the term "about." Accordingly, unless indicated to the contrary, the numerical parameters set forth in the following specification and appended claims are approximations that may vary depending upon the desired properties to be obtained by the present invention.

[0032] The polylactic acid in the embodiments of the present invention was purchased from Shenzhen Guanghua Weiye Co., Ltd.

[0033] The polyether acrylate in the embodiment of the present invention is polyethylene glycol methyl ether methacrylate, and the average molecular weight is ≈300.

[0034] The graphene oxide in the embodiments of the present invention was purchased from Xiamen Kaina Graphene Technology Co., Ltd.

[0035] The auxiliary agent in the embodiment of the present invention is antioxidant 1010.

[0036] The preparation method of the polylactic acid resin in the embodiment of the present invention comprises the following steps:

[0037] N-vinyl pyrrolidone, polyether acrylate, double-bond-terminated polylactic acid, N,N-methylenebisacrylamide and potassium persulfate in a mass ratio of 0.5:1:2.5:0.05:0.04 were mixed with water, reacted at 70°C for 3 hours under nitrogen protection, and then centrifuged and dried to obtain modified polylactic acid.

[0038] The preparation method of the double-bond-terminated polylactic acid comprises the following steps:

[0039] After dehydration by vacuum distillation of polylactic acid, the mixture was heated at 120° C. in vacuum for 2 h, and then 0.5 wt% of a catalyst (stannous chloride and p-toluenesulfonic acid in a molar ratio of 1:1) and pentaerythritol (polylactic acid:pentaerythritol=10:41, m / m) were added. The mixture was reacted at 145° C. for 2 h, and then the temperature was raised to 170° C. and the reaction was continued for 3 h to obtain hydroxyl-terminated polylactic acid.

[0040] Using toluene as solvent, hydroxy-terminated polylactic acid, acrylic acid, p-toluenesulfonic acid and hydroquinone in a mass ratio of 60:19:0.3:0.09 were mixed, reacted at 120°C for 5 hours, and the solvent was removed under reduced pressure to obtain double-bond-terminated polylactic acid.

[0041] The “parts” in the embodiments of the present invention refer to parts by mass.

[0042] Example 1

[0043] A degradable antibacterial absorbent core, wherein the raw materials of the degradable antibacterial absorbent core include the following components in parts by mass:

[0044]

[0045] The method for preparing the above-mentioned degradable antibacterial absorbent core comprises the following steps:

[0046] S1, using a mixture of ethanol and water in a mass ratio of 9:1 as a solvent, adding glacial acetic acid to adjust the pH to 4, then adding graphene oxide and KH570 in a mass ratio of 1:2, stirring at 80° C. for 7 h, filtering, washing, and drying to obtain pretreated graphene;

[0047] S2, using water as a solvent, mixing the pretreated graphene, hydroxyethyl acrylate, polyether acrylate, sodium acrylate, dimethylaminoethyl methacrylate, N,N-methylenebisacrylamide and ammonium persulfate in a mass ratio of 0.3:1:2:3:0.5:0.08:0.1, stirring at 75 ° C. under nitrogen protection for 6 h, removing the solvent and drying to obtain a water-absorbing antibacterial resin;

[0048] S3. Evenly mix the water-absorbing and antibacterial resin, polylactic acid resin, and additives according to the above-mentioned mass fractions, lay them on the surface of the lower non-woven fabric, spray deionized water to obtain an absorption layer with a thickness of 2 mm, lay the upper non-woven fabric, and obtain a degradable and antibacterial absorption core after drying.

[0049] Example 2

[0050] A degradable antibacterial absorbent core, wherein the raw materials of the degradable antibacterial absorbent core include the following components in parts by mass:

[0051]

[0052] The method for preparing the above-mentioned degradable antibacterial absorbent core comprises the following steps:

[0053] S1, using a mixture of ethanol and water in a mass ratio of 9:1 as a solvent, adding glacial acetic acid to adjust the pH to 4, then adding graphene oxide and KH570 in a mass ratio of 1:2, stirring at 80° C. for 7 h, filtering, washing, and drying to obtain pretreated graphene;

[0054] S2, using water as a solvent, mixing the pretreated graphene, hydroxyethyl acrylate, polyether acrylate, sodium acrylate, dimethylaminoethyl methacrylate, N,N-methylenebisacrylamide and ammonium persulfate in a mass ratio of 0.3:1:2:3:0.5:0.08:0.1, stirring at 75 ° C. under nitrogen protection for 6 h, removing the solvent and drying to obtain a water-absorbing antibacterial resin;

[0055] S3. Evenly mix the water-absorbing and antibacterial resin, polylactic acid resin, and additives according to the above-mentioned mass fractions, lay them on the surface of the lower non-woven fabric, spray deionized water to obtain an absorption layer with a thickness of 2 mm, lay the upper non-woven fabric, and obtain a degradable and antibacterial absorption core after drying.

[0056] Example 3

[0057] A degradable antibacterial absorbent core, wherein the raw materials of the degradable antibacterial absorbent core include the following components in parts by mass:

[0058]

[0059] The method for preparing the above-mentioned degradable antibacterial absorbent core comprises the following steps:

[0060] S1, using a mixture of ethanol and water in a mass ratio of 9:1 as a solvent, adding glacial acetic acid to adjust the pH to 4, then adding graphene oxide and KH570 in a mass ratio of 1:2, stirring at 80° C. for 7 h, filtering, washing, and drying to obtain pretreated graphene;

[0061] S2, using water as a solvent, mixing the pretreated graphene, hydroxyethyl acrylate, polyether acrylate, sodium acrylate, dimethylaminoethyl methacrylate, N,N-methylenebisacrylamide and ammonium persulfate in a mass ratio of 0.5:1:2:3:0.5:0.08:0.1, stirring at 75 ° C under nitrogen protection for 6 h, removing the solvent and drying to obtain a water-absorbing antibacterial resin;

[0062] S3. Evenly mix the water-absorbing and antibacterial resin, polylactic acid resin, and additives according to the above-mentioned mass fractions, lay them on the surface of the lower non-woven fabric, spray deionized water to obtain an absorption layer with a thickness of 2 mm, lay the upper non-woven fabric, and obtain a degradable and antibacterial absorption core after drying.

[0063] Comparative Example 1

[0064] A degradable antibacterial absorbent core. The difference between this comparative example and Example 1 is that the polylactic acid resin is replaced by a physical mixture of polyethylene glycol (PEG400) and unmodified polylactic acid in a mass ratio of 1:2. The other ingredients and preparation method are the same as those in Example 1.

[0065] Comparative Example 2

[0066] A degradable antibacterial absorbent core. The difference between this comparative example and Example 1 is that step S1 is deleted, and in step S2, ordinary graphene oxide is used to replace the pretreated graphene. Other components and preparation methods are the same as those in Example 1.

[0067] Test Example 1

[0068] A comparative test of absorption performance was performed on Examples 1-3 and Comparative Examples 1-2.

[0069] Test method: Refer to GB / T14207-2008 for water absorption and blood absorption rate tests.

[0070] The test results are shown in Table 1.

[0071] Table 1 Absorption performance test results

[0072] project Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Water absorption (g) 55.3 56.9 57.4 47.4 53.6 Artificial menstrual blood penetration time (s) 5.72 5.70 5.69 8.46 6.90 Artificial menstrual blood backflow volume (g) 0.55 0.60 0.54 1.96 0.71

[0073] According to the test results in Table 1, it can be seen that the degradable antibacterial absorbent core of the embodiment of the present invention has extremely high water absorption capacity, short menstrual blood penetration time, and low back-seepage amount. However, the comparative examples 1-2 in which the raw material components were changed reduced the hydrophilicity of polylactic acid or did not introduce graphene oxide into the water-absorbing polymer structure, and could not obtain the ideal liquid absorption and water retention effects, resulting in varying degrees of reduction in water absorption capacity, penetration time, and back-seepage amount.

[0074] Test Example 2

[0075] The antibacterial performance comparison test was performed on Examples 1-3 and Comparative Examples 1-2.

[0076] Test method: Refer to GB / T20944.3-2008 to test the antibacterial performance against Escherichia coli.

[0077] The test results are shown in Table 2.

[0078] Table 2 Antibacterial performance test results

[0079] project Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Antibacterial activity (%) 99.1 99.0 99.3 99.0 96.4

[0080] It can be seen from Table 2 that the absorbent core prepared in Example has good antibacterial properties and has a high inhibitory and killing effect on Escherichia coli, while the antibacterial property of Comparative Example 2 is significantly reduced. This may be because the untreated graphene oxide cannot participate in the polymerization reaction and is therefore easily stacked and agglomerated in the formula, resulting in uneven distribution, resulting in less than ideal antibacterial function.

[0081] 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 invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

[0082] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method 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 can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A degradable antibacterial absorbent core, characterized in that: The raw materials of the degradable antibacterial absorbent core include the following components in parts by mass: in, The water-absorbing and antibacterial resin is obtained by reacting graphene, hydroxyalkyl acrylate, polyether acrylate, acrylate and aminoalkyl acrylate.

2. The degradable antibacterial absorbent core according to claim 1, characterized in that: The polylactic acid resin is obtained by reacting vinyl pyrrolidone, polyether acrylate and terminal double-bond polylactic acid.

3. The degradable antibacterial absorbent core according to claim 1, characterized in that: The auxiliary agent is selected from one or more of a plasticizer, a foaming agent, a surfactant, a bacteriostat, a binder, and an antioxidant.

4. The degradable antibacterial absorbent core according to claim 1, characterized in that: The solvent is water.

5. The method for preparing the degradable antibacterial absorbent core according to any one of claims 1 to 4, characterized in that: The preparation method of the degradable antibacterial absorbent core comprises the following steps: S1, mixing graphene and a silane coupling agent, heating and stirring to react, and obtaining pretreated graphene; S2, mixing the pretreated graphene, hydroxyalkyl acrylate, polyether acrylate, acrylate, aminoalkyl acrylate, a crosslinking agent and an initiator, and heating the mixture under an inert gas atmosphere to obtain a water-absorbing and antibacterial resin; S3. Evenly mix the water-absorbing antibacterial resin, polylactic acid resin and additives, lay them on the surface of the lower non-woven fabric, spray the solvent, lay the upper non-woven fabric, and dry them to obtain a degradable antibacterial absorption core.

6. The method for preparing the degradable antibacterial absorbent core according to claim 5, characterized in that: The silane coupling agent is KH570.

7. The method for preparing the degradable antibacterial absorbent core according to claim 5, characterized in that: The mass ratio of the pretreated graphene, hydroxyalkyl acrylate, polyether acrylate, acrylate, and aminoalkyl acrylate is (0.1-1):(1-2):(1-3):(2-5):(0.1-1).

8. The method for preparing the degradable antibacterial absorbent core according to claim 5, characterized in that: Also includes: Vinyl pyrrolidone, polyether acrylate, double-bond-terminated polylactic acid, a crosslinking agent and an initiator are mixed, and heated to react under an inert gas atmosphere to obtain a polylactic acid resin.

9. The method for preparing the degradable antibacterial absorbent core according to claim 8, characterized in that: The mass ratio of the vinyl pyrrolidone, polyether acrylate and terminal double-bond polylactic acid is (0.1-1):(1-2):(1-5).

10. Use of the degradable antibacterial absorbent core according to any one of claims 1 to 4 in sanitary napkins.

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