An antibacterial and odor-removing water-absorbing protective towel

Abstract

The present invention relates to the technical field of absorbent towels, specifically to an antibacterial and odor-removing absorbent protective towel, which comprises the following structures from top to bottom: a skin-friendly layer, a diversion layer, an adsorption layer, and a base film; the adsorption layer is a stack of one or more of fluff pulp, a polymer water-absorbent resin, and dust-free paper; and the polymer water-absorbent resin contains 1 to 30 wt% of a gel sponge. The present invention prepares an emulsion by mixing an oil gel made from corn germ oil, beeswax, and essential oil with chitosan and pure rubber, cross-linking the emulsion with carboxymethyl chitosan and carboxymethyl cellulose, freeze-drying the emulsion, and mixing the obtained gel sponge with the polymer water-absorbent resin. The emulsion is applied to the adsorption layer, has good water absorption and water holding capacity, keeps the environment dry, avoids bacterial growth and liquid concentration, and can absorb urea produced by urine decomposition. The emulsion has good antibacterial ability, effectively prevents microbial degradation of urine, prevents urinary tract infections, and eliminates odor when the protective towel is in use.

Description

Technical Field

[0001] The invention relates to the technical field of absorbent towels, in particular to an antibacterial and odor-removing absorbent towel. Background Art

[0002] A significant number of women experience involuntary urine leakage during coughing, sneezing, and exercise, with varying degrees of leakage. Urine leakage is a common physiological phenomenon among women. Due to privacy concerns and traditional customs, women often misunderstand urine care methods and often use sanitary napkins to absorb urine. Compared to menstrual blood, urine is thinner, flows faster, and is more fluid. Common sanitary napkins are inadequate for this, and can easily lead to problems such as insufficient absorption and reverse osmosis. This results in a chronically damp environment in the vagina, fostering bacterial infection and contributing to odor. When urine is in the bladder, urea solubilizes and gradually decomposes, producing a pungent odor that contributes to urine excretion. Outside the body, microbial degradation of urine components initially increases the urine's pH, producing trimethylamine, which has an ammonia-like odor. Later, when the pH returns to neutral, strongly odorous molecules such as p-cresol and indole are released, causing odor and bacterial threats to the vaginal environment. Therefore, we propose an antibacterial and odor-removing absorbent wipe. Summary of the Invention

[0003] The object of the present invention is to provide an antibacterial and odor-removing water-absorbing protective towel to solve the problems raised in the above-mentioned background technology.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: an antibacterial and odor-removing water-absorbing protective towel, which comprises the following structures from top to bottom: a skin-friendly layer, a guide layer, an adsorption layer and a base film.

[0005] Furthermore, the skin-friendly layer is a microfiber cotton layer with a gram weight of 18 to 50 g / m 2 ; Fiber length 51mm, thickness 0.8 denier~1.5 denier, number of pores 36F.

[0006] Furthermore, the guide layer is a hot air non-woven fabric or a chemically bonded non-woven fabric with a gram weight of 16 to 60 g / m 2 The guide layer structure is located between the skin-friendly layer and the adsorption layer, which can help the liquid to quickly conduct and diffuse from the skin-friendly layer to the adsorption layer structure, and be adsorbed and locked by the adsorption layer.

[0007] Furthermore, the thickness of the adsorption layer is 0.35 to 0.80 mm, and the material is a mixture of one or more of fluff pulp, absorbent resin, and dust-free paper.

[0008] Furthermore, the adsorption layer includes: 30-35wt% water-absorbent resin, 15wt% hot-melt fiber, and the remainder is wood pulp fiber. Fluff pulp has good liquid conductivity, but is generally thicker. Water-absorbent resin has extremely strong water absorption and water retention capabilities. Non-woven fabrics have good elasticity, good flexibility, drape, and excellent water absorption and water retention properties. Therefore, this application chooses to combine dust-free paper and water-absorbent resin as the liquid adsorption layer material, which can effectively absorb and retain water, ensuring the performance of the protective towel; specifically, it is made of water-absorbent resin, hot-melt fiber and wood pulp fiber using a thermal bonding method.

[0009] Furthermore, the bottom film is a PE breathable bottom film or a hot air breathable bottom film, with a gram weight of 12 to 80 g / m 2 The bottom film is made of polyethylene microporous film (PE breathable bottom film) or hot air bonded non-woven bottom film, which can ensure that the liquid in the protective towel does not seep back while making it more breathable, effectively relieving stuffiness and keeping the use environment dry and comfortable.

[0010] Furthermore, the bottom of the base film is provided with adhesive backing, and the bottom of the adhesive backing is provided with release paper, which can fix the protective towel in the required position and perform safe bonding to ensure that there is no adhesive backing residue at the use position after the protective towel is separated.

[0011] Furthermore, the water-absorbing resin contains 1-10 wt% of gel sponge and 10-20 wt% of activated carbon, with the remainder being high molecular water-absorbing resin.

[0012] Furthermore, the high molecular water-absorbing resin is one of sodium polyacrylate, starch-potassium polyacrylate, and acrylamide-acrylate copolymer.

[0013] Furthermore, the gel sponge is prepared by the following process:

[0014] (1) Take corn germ oil, heat it to 60-80°C, add beeswax and essential oil, mix, and stir at a speed of 300-500 r / min until the system materials are completely mixed to obtain oil gel;

[0015] Chitosan is mixed with acetic acid solution and stirred at 20-28°C for 8-12 hours; the mixture is mixed with pure rubber solution and stirred to obtain a mixed solution; the oil gel is added, the pH is adjusted to 4-6 with hydrochloric acid, shearing and stirring are performed at a speed of 9000-12000 r / min for 18-23 minutes, the mixture is allowed to stand at 2-5°C for 8-12 hours, and ripened at 20-28°C for 24 hours to obtain an emulsion;

[0016] (2) Take carboxymethyl chitosan, add deionized water and polyethylene oxide, stir and dissolve; add carboxymethyl cellulose aqueous solution and the emulsion obtained in step (1), heat to 50-55°C, stir and mix for 27-35 minutes; add genipin solution, stir at 50-55°C for 100-150 minutes; add calcium chloride solution, continue to react for 50-70 minutes; cool to room temperature, put into a mold and let it stand for 100-150 minutes, freeze at -20--18°C for 18-20 hours, and freeze-dry. The process conditions are: temperature -50--45°C, vacuum degree 12-16 Pa, and drying time 1-3 days to obtain a gel sponge.

[0017] Furthermore, in step (1), the mass ratio of the oil gel to the mixed solution is 1:9;

[0018] The oil gel comprises the following components by mass: 0.1% to 0.3% essential oil, 4.0% to 8.5% beeswax, and the balance is corn germ oil;

[0019] The mass concentration of chitosan in the mixed solution is 0.05% to 0.20%, and the mass concentration of pure rubber is 1.0% to 2.0%;

[0020] The mass concentration of the acetic acid solution is 1%.

[0021] Furthermore, the essential oil is a mixture of one or more of thyme essential oil, tea tree essential oil, eucalyptus essential oil, and citronellyl methyl crotonate;

[0022] Pure rubber: viscosity (6% aqueous solution) 3.5~6.0mPas, degree of substitution 3.1%.

[0023] Furthermore, in step (2), the gel sponge is prepared from the following components by mass: 20-40 parts of carboxymethyl chitosan, 5-10 parts of carboxymethyl cellulose, 0.15-0.3 parts of genipin, 30-60 parts of emulsion, and 2-4 parts of calcium chloride;

[0024] The ratio of carboxymethyl chitosan, deionized water, and polyethylene oxide is (4-5) g:100 mL:(1.0-1.3) g;

[0025] The mass concentration of carboxymethyl cellulose aqueous solution is 1%;

[0026] The mass concentration of genipin solution is 0.1%;

[0027] The mass concentration of calcium chloride solution is 1%;

[0028] Furthermore, the carboxymethyl cellulose is modified, and the specific modification process is as follows:

[0029] Take carboxymethyl cellulose, add hydrochloric acid, and stir for 15 to 60 minutes; add N-hydroxymethyl acrylamide and catalyst magnesium chloride, react at 120 to 160°C for 5 to 10 minutes; wash with anhydrous ethanol, and dry at room temperature to obtain unsaturated carboxymethyl cellulose;

[0030] Unsaturated carboxymethyl cellulose is added to pure water at 40-50° C., fully stirred, tea polyphenols and an initiator are added, and microwave treatment is performed for 5-10 minutes at a microwave power of 350-360W. The modified carboxymethyl cellulose is washed with anhydrous ethanol, dried to a constant weight, crushed, and passed through a 40-mesh sieve to obtain the modified carboxymethyl cellulose.

[0031] Furthermore, the mass of N-hydroxymethyl acrylamide is 10% of the mass of carboxymethyl cellulose;

[0032] The mass of the catalyst magnesium chloride is 0.41% to 0.54% of the mass of the carboxymethyl cellulose;

[0033] The ratio of carboxymethyl cellulose to hydrochloric acid is 40 g / 100 mL; the concentration of hydrochloric acid is 1 M.

[0034] Furthermore, the mass ratio of unsaturated carboxymethyl cellulose, tea polyphenols, and initiator potassium sulfate is 100:(10.0-12.5):(5.0-5.6);

[0035] The ratio of unsaturated carboxymethyl cellulose to pure water is 40 g / 100 mL.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] In the technical solution of the antibacterial and odor-removing water-absorbing protective towel of the present invention, as the main water-absorbing and water-locking structure in the structure of the protective towel, the water-absorbing resin has good water absorption and water-holding properties. In order to further improve its water absorption, anti-swelling and mechanical properties, and give it antibacterial and deodorizing capabilities, the present application adds gel sponge and activated carbon to the water-absorbing resin. The added activated carbon can absorb odor and moisture when the protective towel is used, improve the supporting force of the water-absorbing resin, and is beneficial to the improvement of the adsorption, deodorization, water holding and mechanical properties of the protective towel. In the preparation process of the gel sponge, corn germ oil is first used as the oil phase, and beeswax and essential oil are added to mix to obtain a corn germ oil solution of beeswax. The shape of the beeswax crystals is needle-shaped or rod-shaped, and they form a three-dimensional network after aggregation, so as to form a gel state when mixed with corn germ oil to obtain an oil gel.

[0038] The oil gel is then mixed with chitin. Under shear, the chitin is adsorbed at the oil / water interface to form a Pickering emulsion. Pure glue is introduced into the system as an emulsifier, covering the surface of the oil gel. The electrostatic repulsion and steric hindrance effect inhibit the aggregation of the oil gel, which helps to enhance the stability of the prepared emulsion and improve the antioxidant properties of the oil in the emulsion, delaying the oxidation of essential oils and corn germ oil, ensuring their full performance. Part of the beeswax can play a "self-emulsifying" role at the oil / water interface, further improving the stability of the emulsion. After drying, the constructed emulsion system forms a porous material with a certain strength and can maintain the morphology of the material in the emulsion, maintain the adsorption of chitin on the surface of the oil gel and the network structure of the gel, and can enhance the binding ability of the prepared gel sponge to the liquid and improve its water holding capacity.

[0039] The emulsion is then placed in a cross-linking system of carboxymethyl chitosan and carboxymethyl cellulose, and the amino groups contained in the emulsion and carboxymethyl chitosan are used to chemically cross-link with multiple active functional groups such as olefinic carbon atoms, hydroxyl groups, and carboxyl groups in genipin. The calcium ions in the calcium chloride are electrostatically adsorbed with the carboxyl groups in the system to cause ionic cross-linking, thereby forming a gel network structure with high strength and a certain density. In addition, there are intermolecular interactions between the materials in the system, which can enhance the mechanical properties of the prepared gel. The intermolecular force is relatively large, and after drying, the pores of the gel sponge with a porous sponge system become smaller, thereby ensuring the water absorption capacity of the prepared gel sponge and improving its anti-swelling ability.

[0040] The carboxymethyl cellulose in the gel sponge material is modified. Under the action of acid catalysis, unsaturated double bonds are introduced into the carboxymethyl cellulose structure by reacting with N-hydroxymethyl acrylamide. The free radicals generated by the hydroxyl groups in the tea polyphenols under the action of an initiator are then grafted with the unsaturated double bonds generated in the previous step to obtain tea polyphenol-modified carboxymethyl cellulose, which promotes the formation of a three-dimensional interpenetrating network structure in the gel sponge system. The prepared gel sponge has a stronger water binding capacity, can further improve its water absorption and water holding capacity, and enhances the anti-oxidation and antibacterial properties of the gel sponge and its ability to maintain human skin; at the same time, the salt resistance of the prepared water-absorbing resin is improved, the resistance to urine is improved, and its high water absorption capacity is maintained.

[0041] The generation of urine odor is generally due to the decomposition of urine in the human bladder and its degradation by microorganisms in vitro (trimethylamine, p-cresol, etc.). When the prepared gel sponge is mixed with a high molecular weight water-absorbing resin and applied to the adsorption layer, it has a high water absorption capacity for the liquid, which can keep the environment dry, avoid the growth of bacteria and the concentration of the liquid; chitin and carboxymethyl chitosan have good antibacterial activity, which can give the adsorption layer antibacterial ability, effectively preventing the degradation of urine by microorganisms, thereby eliminating the odor generated when the protective towel is used, and can prevent bacterial diseases such as urinary tract infections. In addition, the gel sponge system exhibits a certain acidity after absorbing water, which can absorb the ammonia smell generated by the decomposition of urine, absorb the ammonia smell, and further eliminate the odor generated when the protective towel is used. With the passage of time and the influence of pressure and action, the corn germ oil and essential oil in the oil gel material system are released through the gel sponge. The methyl citronellyl crotonate therein can capture easily reactive unpleasant molecules, similar to the Michael addition reaction, reacting unpleasant molecules such as amines (skatole, hexylamine) and thiols (thioacetic acid) with the double bonds in the crotonic acid structure to neutralize the reactive odor molecules; the ester group in the methyl citronellyl crotonate is broken by the metabolism of enzymes on the skin surface or the action of bacteria, releasing citronellol, thereby exerting its antibacterial, deodorizing and skin-care effects. DETAILED DESCRIPTION

[0042] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0043] It should be noted that the purchasers of all raw materials involved in the present invention include, without any special restrictions, illustratively:

[0044] In the following examples, a microfiber cotton layer with a weight of 50 g / m 2 Fiber length 51mm, thickness 1.5 denier, pore count 36F, sourced from Changshu Meijie Chemical Fiber Co., Ltd. Hot air non-woven fabric as the guide layer, DL018, weight 50g / m 2 , 100% ES fiber, sourced from Jiangsu Dora Nonwoven Technology Co., Ltd. The thickness of the adsorption layer is 0.50 mm, of which the polymer water-absorbing resin is potassium polyacrylate: sourced from Shandong Kepler Biotechnology Co., Ltd.; wood pulp fiber: fiber length 3.1 mm, average content 2.9×10 6 roots / gram, sourced from Zhejiang Meisen Paper Co., Ltd.; hot melt fiber: 1.78dtex×38mm, sourced from Shaoxing Shangyu Hongqiang Color Polyester Co., Ltd. The base film is a PE breathable base film with a gram weight of 35g / m 2, from Zhongshan Tongmei Plastic Products Co., Ltd.

[0045] Citronellyl methyl crotonate in the essential oil was sourced from Givaudan Food Flavors & Fragrances (Shanghai) Co., Ltd., and other ingredients were sourced from Ji'an Zhongxiang Natural Plant Co., Ltd.; activated carbon: 200 mesh, pH = 8.2, moisture 4.9%, specific surface area 978 m 2 / g, sourced from Shanghai Quanhu Activated Carbon Co., Ltd.; beeswax: sourced from Japan Yokoseki Oil & Fats Industry Co., Ltd.; corn germ oil: sourced from Shanghai Yuanye Biotechnology Co., Ltd.; chitin: C104157, sourced from Shanghai Aladdin Biochemical Technology Co., Ltd.; pure gum: PURITY GUM 2000, viscosity (6% aqueous solution) 3.5-6.0 mPas, degree of substitution 3.1%, sourced from Deqing Sanfu Food Co., Ltd.; carboxymethyl chitosan: sourced from Shanghai Maclean Biotechnology Co., Ltd.; carboxymethyl cellulose: sourced from Shanghai Maclean Biotechnology Co., Ltd.

[0046] Example 1: A method for preparing an antibacterial and odor-removing absorbent protective towel, comprising the following steps:

[0047] S1. Modification of carboxymethyl cellulose:

[0048] Take 120g of carboxymethyl cellulose, add 300mL of 1M hydrochloric acid, stir for 15min; add 12g of N-hydroxymethyl acrylamide and 0.49g of magnesium chloride as catalyst, react at 120℃ for 5min; wash with anhydrous ethanol and dry at room temperature to obtain unsaturated carboxymethyl cellulose;

[0049] 100 g of unsaturated carboxymethyl cellulose was added to 250 mL of pure water at 40°C, stirred thoroughly, and 10.0 g of tea polyphenols and 5.0 g of initiator potassium sulfate were added. The mixture was microwaved for 5 min at 350 W. The mixture was washed with anhydrous ethanol, dried to constant weight, crushed, and passed through a 40-mesh sieve to obtain modified carboxymethyl cellulose.

[0050] S2. Preparation of gel sponge:

[0051] (1) Take corn germ oil, heat it to 60°C, add beeswax, thyme essential oil, and methyl crotonate citronellyl, mix them, and stir them at a speed of 300 r / min until the system materials are completely mixed to obtain an oil gel; the oil gel contains 0.1wt% essential oil (the mass ratio of thyme essential oil to methyl crotonate citronellyl is 9:1), 4.0wt% beeswax, and the balance is corn germ oil; take chitosan and mix it with 1wt% acetic acid solution, stir it at a temperature of 20°C for 12h; mix it with pure gum solution and stir it to obtain a mixed solution; the chitosan content in the mixed solution is 0.05wt%, and the pure gum content is 1.0%wt; take 90g of the mixed solution, add 10g of the oil gel, adjust the pH to 4 with hydrochloric acid, shear and stir it at a speed of 9000 r / min for 23min, let it stand at 2°C for 8h, and mature it at 20°C for 24h to obtain an emulsion;

[0052] (2) Take 20g of carboxymethyl chitosan, add 500mL of deionized water and 5g of polyethylene oxide, stir and dissolve; add 500mL of a 1wt% aqueous solution of modified carboxymethyl cellulose and 30g of the emulsion obtained in step (1), heat to 50°C, stir and mix for 27min; add 150mL of a 0.1wt% genipin solution, stir for 150min at 50°C; add 200mL of a 1wt% calcium chloride solution, continue the reaction for 50min; cool to room temperature, put into a mold and let stand for 100min, freeze at -18°C for 20h, and freeze-dry. The process conditions are: temperature -45°C, vacuum degree 12Pa, drying time 3d, crushing, and passing through an 80-mesh sieve to obtain a gel sponge;

[0053] S3. Preparation of adsorption layer:

[0054] A polymer water-absorbing resin, potassium polyacrylate, is mixed with activated carbon and gel sponge to obtain a water-absorbing resin; the water-absorbing resin is mixed with wood pulp fiber and hot-melt fiber, and hot-rolled to obtain an adsorption layer; the water-absorbing resin contains 1 wt% of gel sponge, 10 wt% of activated carbon, and the remainder is polymer water-absorbing resin; and the adsorption layer contains: 30 wt% of polymer water-absorbing resin, 15 wt% of hot-melt fiber, and the remainder is wood pulp fiber;

[0055] S4. Preparation of water-absorbing protective towel:

[0056] The skin-friendly layer, the diversion layer, the adsorption layer and the base film are stacked in order from top to bottom, and hot pressed to obtain a water-absorbing protective towel.

[0057] Example 2: A method for preparing an antibacterial and odor-removing absorbent protective towel, comprising the following steps:

[0058] S1. Modification of carboxymethyl cellulose:

[0059] Take 120g of carboxymethyl cellulose, add 300mL of 1M hydrochloric acid, stir for 35min; add 12g of N-hydroxymethyl acrylamide and 0.57g of magnesium chloride as catalyst, react at 140℃ for 7min; wash with anhydrous ethanol and dry at room temperature to obtain unsaturated carboxymethyl cellulose;

[0060] 100 g of unsaturated carboxymethyl cellulose was added to 250 mL of pure water at 45°C, stirred thoroughly, and 11.2 g of tea polyphenols and 5.3 g of initiator potassium sulfate were added. The mixture was microwaved for 8 min at 355 W. The mixture was washed with anhydrous ethanol, dried to constant weight, crushed, and passed through a 40-mesh sieve to obtain modified carboxymethyl cellulose.

[0061] S2. Preparation of gel sponge:

[0062] (1) Corn germ oil was heated to 70° C., beeswax, eucalyptus essential oil, and methyl citronellyl crotonate were added, and the mixture was stirred at a speed of 400 r / min until the system materials were completely mixed to obtain an oil gel; the oil gel contained 0.2 wt% essential oil (the mass ratio of eucalyptus essential oil to methyl citronellyl crotonate was 9:1), 6.2 wt% beeswax, and the balance was corn germ oil;

[0063] Chitosan was mixed with 1 wt% acetic acid solution and stirred at 25°C for 10 h; then mixed with pure rubber solution and stirred to obtain a mixed solution; the chitosan content in the mixed solution was 0.12 wt% and the pure rubber content was 1.5 wt%;

[0064] 90 g of the mixed solution was added with 10 g of the oil gel, the pH was adjusted to 5 with hydrochloric acid, shear-stirred at 11,000 rpm for 20 min, allowed to stand at 3°C ​​for 10 h, and aged at 25°C for 24 h to obtain an emulsion;

[0065] (2) Take 30g of carboxymethyl chitosan, add 666mL of deionized water and 8mL of polyethylene oxide, stir and dissolve; add 750mL of 1wt% modified carboxymethyl cellulose aqueous solution and 45g of the emulsion obtained in step (1), heat to 52°C, stir and mix for 30min; add 225mL of 0.1wt% genipin solution, stir for 120min at 52°C; add 300mL of 1wt% calcium chloride solution, continue to react for 60min; cool to room temperature, put into a mold and let stand for 120min, freeze at -19°C for 19h, and freeze-dry. The process conditions are: temperature -48°C, vacuum degree 15Pa, drying time 2d, crush, pass through an 80-mesh sieve to obtain a gel sponge;

[0066] S3. Preparation of adsorption layer:

[0067] A polymer water-absorbing resin starch-potassium polyacrylate is mixed with activated carbon and gel sponge to obtain a water-absorbing resin; the water-absorbing resin is mixed with wood pulp fiber and hot-melt fiber, and hot-rolled to obtain an adsorption layer; the water-absorbing resin contains 5wt% of gel sponge, 15wt% of activated carbon, and the remainder is polymer water-absorbing resin; and the adsorption layer includes: 32wt% of polymer water-absorbing resin, 15wt% of hot-melt fiber, and the remainder is wood pulp fiber.

[0068] S4. Preparation of water-absorbing protective towel:

[0069] The skin-friendly layer, the diversion layer, the adsorption layer and the base film are stacked in order from top to bottom, and hot pressed to obtain a water-absorbing protective towel.

[0070] Example 3: A method for preparing an antibacterial and odor-removing absorbent protective towel, comprising the following steps:

[0071] S1. Modification of carboxymethyl cellulose:

[0072] Take 120g of carboxymethyl cellulose, add 300mL of 1M hydrochloric acid, stir for 60min; add 12g of N-hydroxymethyl acrylamide and 0.65g of magnesium chloride as a catalyst, react at 160℃ for 5min; wash with anhydrous ethanol and dry at room temperature to obtain unsaturated carboxymethyl cellulose;

[0073] 100 g of unsaturated carboxymethyl cellulose was added to 250 mL of pure water at 50°C, stirred thoroughly, and 12.5 g of tea polyphenols and 5.6 g of initiator potassium sulfate were added. The mixture was microwaved for 10 min at 360 W. The mixture was washed with anhydrous ethanol, dried to constant weight, crushed, and passed through a 40-mesh sieve to obtain modified carboxymethyl cellulose.

[0074] S2. Preparation of gel sponge:

[0075] (1) Corn germ oil was heated to 80° C., beeswax, tea tree oil, and methyl crotonate citronellyl were added, and the mixture was stirred at a speed of 500 r / min until the system materials were completely mixed to obtain an oil gel; the oil gel contained 0.3 wt% essential oil (the mass ratio of tea tree oil to methyl crotonate was 9:1), 8.5 wt% beeswax, and the balance was corn germ oil;

[0076] Chitosan was mixed with 1 wt% acetic acid solution and stirred at 28°C for 8 h; mixed with pure rubber solution and stirred to obtain a mixed solution; the chitosan content in the mixed solution was 0.20 wt% and the pure rubber content was 2.0% wt;

[0077] 90 g of the mixed solution was added with 10 g of the oil gel, the pH was adjusted to 6 with hydrochloric acid, shear-stirred at 12,000 rpm for 18 min, allowed to stand at 5°C for 12 h, and aged at 28°C for 24 h to obtain an emulsion;

[0078] (2) Take 40g of carboxymethyl chitosan, add 800mL of deionized water and 11.6mL of polyethylene oxide, stir and dissolve; add 1000mL of 1wt% modified carboxymethyl cellulose aqueous solution and 60g of the emulsion obtained in step (1), heat to 55℃, stir and mix for 35min; add 300mL of 0.1wt% genipin solution, stir for 150min at 55℃; add 400mL of 1wt% calcium chloride solution, continue to react for 70min; cool to room temperature, put into a mold and let stand for 150min, freeze at -20℃ for 18h, and freeze-dry. The process conditions are: temperature -50℃, vacuum degree 16Pa, drying time 1d, crush, pass through 80 mesh sieve to obtain a gel sponge;

[0079] S3. Preparation of adsorption layer:

[0080] A polymer water-absorbing resin starch-potassium polyacrylate is mixed with activated carbon and gel sponge to obtain a water-absorbing resin; the water-absorbing resin is mixed with wood pulp fiber and hot-melt fiber, and hot-rolled to obtain an adsorption layer; the water-absorbing resin contains 10wt% of gel sponge, 20wt% of activated carbon, and the remainder is polymer water-absorbing resin; the adsorption layer includes: 35wt% of polymer water-absorbing resin, 15wt% of hot-melt fiber, and the remainder is wood pulp fiber.

[0081] S4. Preparation of water-absorbing protective towel:

[0082] The skin-friendly layer, the diversion layer, the adsorption layer and the base film are stacked in order from top to bottom, and hot pressed to obtain a water-absorbing protective towel.

[0083] Comparative Example 1: Preparation method of an antibacterial and odor-removing water-absorbing protective towel:

[0084] Compared with Example 1, the carboxymethyl cellulose in Comparative Example 1 was not modified, and the modified carboxymethyl cellulose in the preparation components of S2 and the gel sponge was replaced with carboxymethyl cellulose of equal mass. The other process steps and process parameters were the same as those in Example 1 to obtain a water-absorbing protective towel.

[0085] Comparative Example 2: Preparation method of an antibacterial and odor-removing water-absorbing protective towel:

[0086] S1. Preparation of gel sponge:

[0087] (1) Take corn germ oil, heat it to 60°C, add beeswax, thyme essential oil, and methyl crotonate citronellyl, mix them, and stir them at a speed of 300 r / min until the system materials are completely mixed to obtain an oil gel; the oil gel contains 0.1wt% essential oil (the mass ratio of thyme essential oil to methyl crotonate is 9:1), 4.0wt% beeswax, and the balance is corn germ oil; take chitosan and mix it with 1wt% acetic acid solution, stir it at a temperature of 20°C for 12h, and obtain a 0.05wt% liquid; take 90g of the liquid, add 10g of the oil gel, adjust the pH to 4 with hydrochloric acid, shear and stir it at a speed of 9000 r / min for 23min, let it stand at 2°C for 8h, and mature it at 20°C for 24h to obtain an emulsion;

[0088] (2) Take 20g of carboxymethyl chitosan, add 500mL of deionized water and 5g of polyethylene oxide, stir and dissolve; add 500mL of a 1wt% aqueous solution of carboxymethyl cellulose and 30g of the emulsion obtained in step (1), heat to 50°C, stir and mix for 27min; add 150mL of a 0.1wt% genipin solution, stir for 150min at 50°C; add 200mL of a 1wt% calcium chloride solution, continue the reaction for 50min; cool to room temperature, put into a mold and let stand for 100min, freeze at -18°C for 20h, and freeze-dry. The process conditions are: temperature -45°C, vacuum degree 12Pa, drying time 3d, crushing, and passing through an 80-mesh sieve to obtain a gel sponge;

[0089] Steps S2 and S3 are respectively the same as S3 and S4 in Example 1, and a water-absorbing protective towel is obtained.

[0090] Comparative Example 3: Preparation method of an antibacterial and odor-removing water-absorbing protective towel:

[0091] S1. Preparation of gel sponge:

[0092] (1) Chitosan was mixed with a 1 wt% acetic acid solution and stirred at 20°C for 12 h to obtain a 0.05 wt% liquid; 90 g of the liquid was added with 10 g of corn germ oil, the pH was adjusted to 4 with hydrochloric acid, sheared and stirred at 9000 r / min for 23 min, allowed to stand at 2°C for 8 h, and aged at 20°C for 24 h to obtain a mixed solution;

[0093] (2) Take 20g of carboxymethyl chitosan, add 500mL of deionized water and 5g of polyethylene oxide, stir and dissolve; add 500mL of a 1wt% aqueous solution of carboxymethyl cellulose and 30g of the mixed solution obtained in step (1), heat to 50°C, and stir for 27min; add 150mL of a 0.1wt% genipin solution, stir for 150min at 50°C; add 200mL of a 1wt% calcium chloride solution, and continue the reaction for 50min; cool to room temperature, put into a mold and let it stand for 100min, freeze at -18°C for 20h, and freeze-dry. The process conditions are: temperature -45°C, vacuum degree 12Pa, drying time 3d, crushing, and passing through an 80-mesh sieve to obtain a gel sponge;

[0094] Steps S2 and S3 are respectively the same as S3 and S4 in Example 1, and a water-absorbing protective towel is obtained.

[0095] Comparative Example 4: Preparation method of an antibacterial and odor-removing water-absorbing protective towel:

[0096] S1. Preparation of gel sponge:

[0097] Take 20g of carboxymethyl chitosan, add 500mL of deionized water and 5g of polyethylene oxide, stir and dissolve; add 500mL of a 1wt% carboxymethyl cellulose aqueous solution and 30g of a 0.05wt% chitin solution, heat to 50°C, and stir for 27min to mix; add 150mL of a 0.1wt% genipin solution, stir for 150min at 50°C; add 200mL of a 1wt% calcium chloride solution, and continue the reaction for 50min; cool to room temperature, put into a mold and let it stand for 100min, freeze at -18°C for 20h, and freeze-dry. The process conditions are: temperature -45°C, vacuum 12Pa, drying time 3d, crushing, and passing through an 80-mesh sieve to obtain a gel sponge;

[0098] Steps S2 and S3 are respectively the same as S3 and S4 in Example 1, and a water-absorbing protective towel is obtained.

[0099] Comparative Example 5: Preparation method of an antibacterial and odor-removing water-absorbing protective towel:

[0100] S1. Preparation of gel sponge:

[0101] Take 20g of carboxymethyl chitosan, add 500mL of deionized water and 5g of polyethylene oxide, stir and dissolve; add 500mL of a 1wt% carboxymethyl cellulose aqueous solution, heat to 50°C, stir and mix for 27min; add 150mL of a 0.1wt% genipin solution, stir at 50°C for 150min; add 200mL of a 1wt% calcium chloride solution, and continue the reaction for 50min; cool to room temperature, put into a mold and let it stand for 100min, freeze at -18°C for 20h, and freeze-dry. The process conditions are: temperature -45°C, vacuum degree 12Pa, drying time 3d, crush, and pass through an 80-mesh sieve to obtain a gel sponge;

[0102] Steps S2 and S3 are respectively the same as S3 and S4 in Example 1, and a water-absorbing protective towel is obtained.

[0103] Comparative Example 6: Preparation method of an antibacterial and odor-removing water-absorbing protective towel:

[0104] Potassium polyacrylate is used as a water-absorbing resin, mixed with wood pulp fiber and hot-melt fiber, and hot-rolled to obtain an adsorption layer; the adsorption layer comprises: 30wt% potassium polyacrylate, 15wt% hot-melt fiber, and the remainder is wood pulp fiber;

[0105] The skin-friendly layer, the diversion layer, the adsorption layer and the base film are stacked in order from top to bottom, and hot pressed to obtain a water-absorbing protective towel.

[0106] Experiment: The absorbent protective towels obtained in Examples 1-3 and Comparative Examples 1-6 were used to prepare samples, and their properties were tested and the test results were recorded:

[0107] Water absorption performance test: The specific gravity method was used to test the liquid absorption performance of the adsorption layer sample. The adsorption layer sample was immersed in 37°C Tris buffer (0.05M, pH 7.2), left to stand for 24 hours, then taken out and placed on a wire mesh for 1 minute. The weight of the sample before and after the experiment was recorded, and the change rate was calculated as the liquid absorption performance indicator - the liquid absorption rate;

[0108] Water holding performance test: Immerse the adsorption layer sample in buffer solution, let it stand for 24 hours, then take it out and dry it in a 37℃ oven for 5 hours. Record the mass of the sample after liquid absorption and after drying. Calculate the mass of the sample after drying / the mass of the sample after liquid absorption. This is recorded as the water retention rate and used as the water retention performance index.

[0109] Antibacterial performance test: Using the inhibition zone method, the adsorption layer sample was trimmed into a 9 cm diameter disc, attached to a solidified MHA plate coated with 100 μL of 106 CFU / mL bacterial solution, and incubated in a water-tight chamber at 37°C for 18 hours. The diameter of the transparent area was measured and recorded as the inhibition zone as an indicator of antibacterial performance.

[0110] Deodorization performance test: Take 10mL of trimethylamine solution (10μg / mL) and use a pipette to drop it on the surface of the absorbent towel sample. After standing for 60s, smell the sample at a distance of 10cm from the sample absorption position.

[0111]

[0112]

[0113] According to the data in the above table, we can clearly draw the following conclusions:

[0114] The absorbent care towels obtained in Examples 1-3 were compared with the absorbent care towels obtained in Comparative Examples 1-6. The test results show that:

[0115] Compared with the comparative example, the absorbent protective towel obtained in Examples 1-3 has higher liquid absorption rate, water retention rate and inhibition zone data, and the odor removal is more obvious; this fully demonstrates that the present invention achieves the improvement of the liquid absorption and water retention performance and antibacterial and odor removal capabilities of the absorbent protective towel.

[0116] Compared with Example 1, Comparative Example 1 replaces the modified carboxymethyl cellulose in the gel sponge preparation component with an equal mass of carboxymethyl cellulose. On the basis of Comparative Example 1, Comparative Example 2 deletes the pure glue in the gel sponge preparation component; Comparative Example 3 deletes the pure glue and beeswax in the gel sponge preparation component; Comparative Example 4 replaces the emulsion in the gel sponge preparation component with an equal mass of chitosan solution; and Comparative Example 5 deletes the emulsion component in the gel sponge preparation component. The adsorption layer component of Comparative Example 6 does not contain gel sponge. The absorbent protective towels obtained in Comparative Examples 1-6 have deteriorated liquid absorption rate, water retention rate and inhibition zone data, and the odor removal is not obvious. It can be seen that the setting of the components and process of the absorbent protective towels prepared in this application can promote the improvement of liquid absorption and water retention performance and antibacterial and odor removal capabilities.

[0117] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include," "comprise," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0118] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An antibacterial and odor-removing absorbent towel, characterized by: From top to bottom, it includes the following structures: skin-friendly layer, diversion layer, adsorption layer and base film; The adsorption layer includes a water-absorbing resin; The water-absorbing resin contains 1 to 10 wt% of gel sponge and 10 to 20 wt% of activated carbon, with the remainder being a high molecular weight water-absorbing resin; The gel sponge is prepared by the following process: (1) Take corn germ oil, heat it to 60-80°C, add beeswax and essential oil, mix them, and stir to obtain oil gel; take chitosan and mix it with acetic acid solution, stir it at 20-28°C for 8-12 hours; mix it with pure gum solution, stir it to obtain a mixed solution; add oil gel, adjust the pH to 4-6 with hydrochloric acid, shear and stir it at a speed of 9000-12000 r / min for 18-23 minutes, let it stand at 2-5°C for 8-12 hours, and mature it at 20-28°C for 24 hours to obtain an emulsion; (2) Take carboxymethyl chitosan, add deionized water and polyethylene oxide, and stir to dissolve; add carboxymethyl cellulose aqueous solution and the emulsion obtained in step (1), heat to 50-55°C, and stir for 27-35 minutes to mix; add genipin solution, stir at 50-55°C for 100-150 minutes; add calcium chloride solution, and continue to react for 50-70 minutes; cool to room temperature, put into a mold and let it stand for 100-150 minutes, freeze at -20--18°C for 18-20 hours, and freeze-dry to obtain a gel sponge; The carboxymethyl cellulose is modified, and the specific modification process is as follows: Take carboxymethyl cellulose, add hydrochloric acid, and stir for 15 to 60 minutes; add N-hydroxymethyl acrylamide and catalyst magnesium chloride, and react at 120 to 160°C for 5 to 10 minutes to obtain unsaturated carboxymethyl cellulose; Unsaturated carboxymethyl cellulose is added to pure water at 40-50° C., fully stirred, tea polyphenols and an initiator are added, and microwave treatment is performed for 5-10 minutes at a microwave power of 350-360W to obtain modified carboxymethyl cellulose.

2. The antibacterial and odor-removing water-absorbing protective towel according to claim 1, characterized in that: In step (1), the mass ratio of the oil gel to the mixed liquid is 1:9; the oil gel includes the following mass components: 0.1% to 0.3% essential oil, 4.0% to 8.5% beeswax, and the balance is corn germ oil; the mass concentration of chitosan in the mixed liquid is 0.05% to 0.20%, and the mass concentration of pure gelatin is 1.0% to 2.0%.

3. The antibacterial and odor-removing water-absorbing protective towel according to claim 1, characterized in that: The essential oil is a mixture of one or more of thyme essential oil, tea tree essential oil, eucalyptus essential oil and citronellyl methyl crotonate.

4. The antibacterial and odor-removing water-absorbing protective towel according to claim 1, characterized in that: In step (2), the gel sponge is prepared from the following components by mass: 20 to 40 parts of carboxymethyl chitosan, 5 to 10 parts of carboxymethyl cellulose, 0.15 to 0.3 parts of genipin, 30 to 60 parts of emulsion, and 2 to 4 parts of calcium chloride.

5. The antibacterial and odor-removing water-absorbing protective towel according to claim 1, characterized in that: The mass of the N-hydroxymethyl acrylamide is 10% of the mass of the carboxymethyl cellulose; the mass of the catalyst magnesium chloride is 0.41% to 0.54% of the mass of the carboxymethyl cellulose.

6. The antibacterial and odor-removing water-absorbing protective towel according to claim 1, characterized in that: The mass ratio of the unsaturated carboxymethyl cellulose, tea polyphenols and initiator potassium sulfate is 100: (10.0-12.5): (5.0-5.6).

7. The antibacterial and odor-removing absorbent towel according to claim 1, characterized in that: The absorption layer comprises: 30-35 wt% of water-absorbing resin, 15 wt% of hot-melt fiber, and the remainder of wood pulp fiber.

8. The antibacterial and odor-removing absorbent towel according to claim 1, characterized in that: The polymer water-absorbing resin is one of sodium polyacrylate, starch-potassium polyacrylate, and acrylamide-acrylate copolymer.

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