CN-121667922-B - Biodegradable nursing pad and preparation process thereof

CN121667922BCN 121667922 BCN121667922 BCN 121667922BCN-121667922-B

Abstract

The invention relates to the technical field of sanitary products, in particular to a biodegradable nursing pad and a preparation process thereof. The nursing pad comprises a skin-friendly top layer, a composite core absorption layer and an impermeable breathable bottom layer from top to bottom. The composite core absorbent layer comprises a gel embedded skeleton formed by an air-laid wood pulp fiber net and composite antibacterial hydrogel which is in-situ crosslinked and embedded in pores of the gel embedded skeleton, and a fluff pulp fiber layer fixed on at least one surface of the skeleton. The composite antibacterial hydrogel comprises hydrophilic reinforcing fibers modified by a silane coupling agent with hydrophilic groups, a sodium alginate matrix and zinc ions. The nursing pad prepared by the invention has excellent rapid absorption, high-efficiency antibacterial and high biodegradability, and solves the problem that the performance and environmental protection of the traditional product are difficult to be compatible.

Inventors

ZHENG JIANHUI
HUANG MAN
Gao Nazi
XIE LUYU
Yuan Huixiao

Assignees

广州健朗医用科技有限公司

Dates

Publication Date: 20260505
Application Date: 20260211

Claims (8)

1. The biodegradable nursing pad is characterized by comprising a skin-friendly top layer, a composite core absorption layer and an impermeable and breathable bottom layer which are sequentially arranged from top to bottom; The composite core absorbent layer comprises: The gel embedding framework is composed of an air-laid wood pulp fiber net and composite antibacterial hydrogel which is formed in situ and embedded in pores of the air-laid wood pulp fiber net, and a fluff pulp fiber layer which is fixed on at least one surface of the gel embedding framework in a bonding or hot pressing mode; the composite antibacterial hydrogel comprises hydrophilic reinforcing fibers, a sodium alginate matrix and zinc ions, wherein the hydrophilic reinforcing fibers are subjected to surface modification by a silane coupling agent with hydrophilic groups, and the hydrophilic reinforcing fibers are formed by calcium ion crosslinking; the preparation method of the composite antibacterial hydrogel comprises the following steps: Preparing a silane coupling agent modified hydrophilic reinforced fiber, sodium alginate and zinc ion pre-gel composite water phase; impregnating the pre-gel composite aqueous phase into an air-laid wood pulp fiber web; Treating the infiltrated air-laid wood pulp fiber net by using a calcium ion cross-linking agent solution to enable sodium alginate to be in-situ cross-linked in pores of the framework to form the composite antibacterial hydrogel; The preparation method of the pre-gel composite water phase comprises the following steps: S1, dispersing 4.0-6.0g of hydrophilic reinforcing fiber in a mixed solvent of 140-200mL of dimethylacetamide and 40-80mL of water, carrying out ultrasonic dispersion for 20-60min at 50-60 ℃ under the conditions of frequency of 15-25kHz and power of 250-350W to obtain reinforcing fiber dispersion liquid, dissolving 0.3-0.7g of silane coupling agent in 10-20mL of 30wt% ethanol aqueous solution, adding the dispersion liquid in the step S1 under the stirring of 300-500rpm, regulating the pH value to 8.0-9.0 by ammonia water, and continuing ultrasonic treatment for 4-6h to obtain organically modified reinforcing fiber dispersion liquid; S2, dissolving sodium alginate in water at a concentration of 2.0-3.0wt%, and adding zinc nitrate to make the molar ratio of Zn 2+ to carboxyl in sodium alginate be (0.01-0.05): 1, thus obtaining sodium alginate sol containing Zn 2+ ; S3, adding 8-15 g of the sodium alginate sol containing Zn 2+ in the step S2 into 10-20 g of the organically modified reinforcing fiber dispersion liquid in S1, stirring for 10-40min at 400-800rpm, and then carrying out high-speed shearing dispersion and standing deaeration to obtain the pre-gel composite water phase.
2. The biodegradable nursing pad of claim 1, characterized in that in the gel chimeric skeleton, the dry basis mass ratio of air-laid wood pulp fiber web to composite antibacterial hydrogel is 1 (0.1-0.2), and the dry basis mass ratio of fluff pulp fiber to gel chimeric skeleton is (0.5-0.9): 1.
3. The biodegradable nursing pad according to claim 1, characterized in that the specific step of in-situ crosslinking is that the pre-gel composite aqueous phase is uniformly soaked in the air-laid wood pulp fiber web according to the mass which is 0.12-0.22 times of the dry mass of the air-laid wood pulp fiber web, and is lightly pressed and rolled, then the calcium chloride solution with the concentration of 1.5-3.5wt% is used for spray crosslinking, and the mixture is kept stand for 3-10min at 20-35 ℃ to complete the crosslinking reaction.
4. The biodegradable nursing pad of claim 1, wherein the skin-friendly top layer is a polylactic acid spunbond nonwoven, and the impermeable breathable bottom layer is a hot water-soluble polyvinyl alcohol film.
5. A method of making a composite core absorbent layer comprising the steps of: The method for preparing the composite antibacterial hydrogel comprises the steps of adopting a pre-gel composite aqueous phase obtained in the preparation method of the composite antibacterial hydrogel according to claim 1, soaking the pre-gel composite aqueous phase in an air-laid wood pulp fiber net, carrying out cross-linking treatment on the soaked air-laid wood pulp fiber net by using a calcium chloride solution to form a gel embedded framework, paving fluff pulp fibers on at least one surface of the gel embedded framework, and fixing by dot-shaped hot pressing or dot-coating of a variable hot melt adhesive.
6. The method according to claim 5, wherein the hot spot pressing is carried out at a temperature of 90-110 ℃ and a pressure of 0.3-0.5 MPa for a time of 0.5-2.0 s, and the dispensing amount of the degradable hot melt adhesive is 1-3 g/m2.
7. A process for preparing the biodegradable nursing pad according to any one of claims 1-4, further comprising the steps of placing the skin-friendly top layer and the impermeable breathable bottom layer on top of and at the bottom of the composite core absorbent layer, respectively, and hot-pressing and compounding at 80-120 ℃ and 0.3-0.7 MPa for 1-3s to obtain the nursing pad.
8. Use of a biodegradable care pad according to claim 1 for the preparation of personal hygiene care products, including incontinence pads, maternal care pads or pet care pads.

Description

Biodegradable nursing pad and preparation process thereof Technical Field The invention relates to the technical field of sanitary products, in particular to a biodegradable nursing pad and a preparation process thereof. Background With the acceleration of the progress of social aging and the general increase of personal hygiene care consciousness, the market demand for disposable sanitary articles such as incontinence pads, puerperal care pads and the like has continued to increase. Conventional nursing pads typically employ a multi-layer composite structure intended to achieve the core function of quickly absorbing, locking in liquid and keeping the surface dry. However, the absorbent core layer is mostly based on a mixture of non-biodegradable polymer absorbent resin and fluff pulp, and the outer layer is usually made of polypropylene nonwoven fabric and polyethylene breathable film. The polymer-based material has extremely long degradation period in natural environment, a great amount of waste products bring severe environmental pressure, and increasingly environmental protection regulations and consumer expectations for sustainable products are urgent for the biodegradability of nursing pads. Currently, many attempts have been made in the industry to develop environmentally friendly nursing pads, such as using polylactic acid non-woven fabrics, starch-based materials, or increasing the amount of natural fibers. However, these improvements often face a tradeoff between performance and cost. On the one hand, absorbent cores made of purely or simply mixed degradable materials often have inferior absorption rates, liquid retention capacity and reverse osmosis resistance to conventional SAP composites, especially when dealing with large, rapid liquid discharges. On the other hand, most of antibacterial agents introduced to enhance functionality are of a physical addition type, and there may be problems of insufficient migration, precipitation or antibacterial durability, and part of antibacterial components themselves may affect the biodegradation process or environmental compatibility of the material. Therefore, developing a nursing pad core layer structure which can realize efficient absorption and reliable antibiosis and ensure complete biodegradation of the whole material after discarding becomes a prominent technical challenge in the field. The three problems of excellent service performance, long-acting antibacterial sanitation and complete environmental degradability of the disposable nursing pad product can not be fully solved in the prior art. There is a need in the market for a new solution that not only implements the concept of biodegradability in terms of material selection, but also promotes the substantial development of personal hygiene care products in a truly sustainable direction by preparing a high-performance absorbent core that combines rapid liquid transfer, high-capacity absorption, stable antimicrobial functions, and compostable degradation of all components. Disclosure of Invention Aiming at the defects in the prior art, the invention provides a biodegradable nursing pad and a preparation process thereof. In order to solve the technical problems, the invention adopts the following technical scheme: A biodegradable nursing pad comprises a skin-friendly top layer, a composite core absorption layer and an impermeable breathable bottom layer which are sequentially arranged from top to bottom. The composite core absorbent layer comprises: The gel embedding framework is composed of an air-laid wood pulp fiber net and composite antibacterial hydrogel which is formed in situ and embedded in pores of the air-laid wood pulp fiber net, and a fluff pulp fiber layer which is fixed on at least one surface of the gel embedding framework in a bonding or hot pressing mode; The composite antibacterial hydrogel comprises hydrophilic reinforcing fibers subjected to surface modification by a silane coupling agent with hydrophilic groups, a sodium alginate matrix and zinc ions, and is formed by calcium ion crosslinking. Although the conventional nursing pad material can provide a certain moisture absorption function, the antibacterial performance is weak, and bacteria are easy to grow due to the retention of moisture after moisture absorption, so that discomfort and peculiar smell are caused. The composite antibacterial hydrogel not only can promote the hygroscopicity of the nursing pad and absorb body fluid or moisture to keep the skin dry, but also can effectively inhibit the growth of bacteria in the long-time use process, and ensure the sanitation and the comfort of the nursing pad. In addition, the addition of the antibacterial components in the composite hydrogel can prolong the service life of the nursing pad, reduce the risk of bacterial transmission, and can continuously provide antibacterial protection particularly in a humid environment so as to ensure the long-term effectiveness of the nursi