CN114561802A - Natural antibacterial non-woven fabric and preparation method thereof - Google Patents
Natural antibacterial non-woven fabric and preparation method thereof Download PDFInfo
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- D06M15/03—Polysaccharides or derivatives thereof
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- D06M13/248—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing sulfur or phosphorus with compounds containing sulfur
- D06M13/256—Sulfonated compounds esters thereof, e.g. sultones
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Abstract
本发明涉及一种天然抗菌无纺布及其制备方法，包括：由PP切片经纺粘法生产工艺制得纺粘无纺布；在所述纺粘无纺布上涂布壳聚糖分散液，干燥后即得到所述天然抗菌无纺布。其中，所述壳聚糖分散液包括以下按质量百分数计的组分：水溶性改性壳聚糖0.3‑1%，胶黏剂0.3‑1%，其余为水。本发明以天然生物质多糖高分子材料——壳聚糖作为有机抗菌原料，通过胶粘剂增强水溶性改性壳聚糖附着于纺粘无纺布上，能够对革兰氏阳性菌、革兰氏阴性菌起到有效的抑菌作用，使制备的天然抗菌无纺布具有优异的抗菌性能，无毒无污染，安全性极佳。本发明制得的天然抗菌无纺布可以是具有抗菌功能的亲水无纺布或拒水无纺布，制作工艺简单，操作便捷，节省了人力及设备成本。The invention relates to a natural antibacterial non-woven fabric and a preparation method thereof. , the natural antibacterial non-woven fabric is obtained after drying. Wherein, the chitosan dispersion liquid includes the following components by mass percentage: water-soluble modified chitosan 0.3-1%, adhesive 0.3-1%, and the rest is water. The invention uses chitosan, a natural biomass polysaccharide polymer material, as the organic antibacterial raw material, and the water-soluble modified chitosan is enhanced by an adhesive to attach to the spunbond non-woven fabric, which can effectively prevent Gram-positive bacteria, Gram-positive bacteria, and Gram-positive bacteria. Negative bacteria play an effective bacteriostatic effect, so that the prepared natural antibacterial non-woven fabric has excellent antibacterial properties, is non-toxic, non-polluting, and has excellent safety. The natural antibacterial non-woven fabric prepared by the invention can be a hydrophilic non-woven fabric or a water-repellent non-woven fabric with antibacterial function, and the production process is simple, the operation is convenient, and labor and equipment costs are saved.
Description
技术领域technical field
本发明属于无纺布技术领域，具体涉及一种天然抗菌无纺布及其制备方法。The invention belongs to the technical field of non-woven fabrics, and particularly relates to a natural antibacterial non-woven fabric and a preparation method thereof.
背景技术Background technique
婴儿的皮肤娇嫩且在使用纸尿裤时容易滋生细菌，产生异味，即使频繁更换，也有类似问题困扰，影响婴儿身体健康和舒适性。因此，婴儿纸尿裤除了应具备吸湿性强、透气性好的基本特性之外，同时应具备抗菌性能且无副作用，使婴儿穿着更舒适，减少婴儿臀部感染。纸尿裤的主要材料是无纺布，无纺布的主要生产原料是涤纶和丙纶。纺粘无纺布是在聚合物被熔融挤出、拉伸而形成连续长丝后，长丝铺设成网，纤网再经过自身粘合、热粘合、化学粘合或机械加固等方法，使纤网变成无纺布。因此，抗菌纸尿裤的研究重点是如何制备抗菌无纺布。Babies' skin is delicate and easy to breed bacteria and produce odors when using diapers. Even if they are changed frequently, there are similar problems, which affect the baby's health and comfort. Therefore, in addition to the basic characteristics of strong hygroscopicity and good air permeability, baby diapers should also have antibacterial properties and no side effects, so that babies are more comfortable to wear and reduce infection of the baby's buttocks. The main material of diapers is non-woven fabrics, and the main raw materials of non-woven fabrics are polyester and polypropylene. Spunbond non-woven fabric is a continuous filament after the polymer is melt extruded and stretched, the filament is laid into a web, and the web is then bonded by itself, thermally bonded, chemically bonded or mechanically reinforced. Turn the web into a non-woven fabric. Therefore, the research focus of antibacterial diapers is how to prepare antibacterial non-woven fabrics.
现有的抗菌纸尿裤大多处于产品研发、专利申请阶段，如中国发明专利CN103194855A公开了一种纳米银抗菌无纺布的制备方法及其在纸尿裤上的应用，该纳米银抗菌无纺布的制备方法包括PE抗菌母粒的制备，抗菌ES纤维的制备，松棉、定型等步骤；该纳米银抗菌无纺布中的纳米银离子经过改性处理，可均匀分布在无纺布纤维中，形成具有抗菌性能的高新技术材料，正常保存时间可达五年以上，可长久有效的抑制细菌滋生，具有长效的物理杀菌功能以及独有的自动清洁功能。又如，中国发明专利CN 106894227A公开了抗菌无纺布及其制备方法，该抗菌无纺布采用由纳米锌复合抗菌剂、聚氨酯类粘合剂、胍盐和水组成的浸轧液进行处理来制备，制得的抗菌无纺布能够对真菌和细菌起到有效的抑制作用，且无毒副作用，不会引起皮肤过敏或不适；能够实现短效和长效抑菌的性能；并且成本低，用途广泛。Most of the existing antibacterial diapers are in the stage of product development and patent application. For example, Chinese invention patent CN103194855A discloses a preparation method of nano-silver antibacterial non-woven fabric and its application in diapers. The preparation method of nano-silver antibacterial non-woven fabric Including the preparation of PE antibacterial masterbatch, the preparation of antibacterial ES fiber, cotton loosening, shaping and other steps; the nano silver ions in the nano silver antibacterial non-woven fabric can be evenly distributed in the non-woven fabric fiber after modification, forming a High-tech materials with antibacterial properties, the normal storage time can reach more than five years, which can effectively inhibit the growth of bacteria for a long time, and has a long-term physical sterilization function and a unique automatic cleaning function. Another example, Chinese invention patent CN 106894227A discloses an antibacterial non-woven fabric and a preparation method thereof. The antibacterial non-woven fabric is treated with a padding liquid composed of nano-zinc composite antibacterial agent, polyurethane adhesive, guanidine salt and water. Preparation, the prepared antibacterial non-woven fabric can effectively inhibit fungi and bacteria, and has no toxic and side effects, and will not cause skin allergies or discomfort; short-acting and long-acting antibacterial properties can be achieved; and the cost is low, Wide range of uses.
目前，市面上的抗菌纸尿裤产品以无机类抗菌剂为主，如Babycare星际纸尿裤添加纳米银离子来达到抗菌效果，安徽舒缘公司以纳米二氧化钛为主体材料开发的抗菌纸尿裤等。但此类无机抗菌材料的安全性始终有待考证，消费者的接受程度也不高。因此，有机抗菌纸尿裤是本行业的研究热点。壳聚糖是一种有机抗菌材料，是天然生物质多糖高分子材料，具有很好的生物相容性、微生物降解性等诸多优良的性能，其广泛地存在于海洋无脊椎动物(如虾、蟹)的外壳中，在自然界每年生物合成量高达1×1010吨，是仅次于纤维素的第二大天然聚合物；但是，因壳聚糖与纤维素分子结构相似，其分子间较强氢键作用力导致其不溶于水和大多数有机溶剂，以沉淀形式存在，限制其应用。At present, the antibacterial diapers on the market are mainly inorganic antibacterial agents. For example, Babycare interstellar diapers add nano silver ions to achieve antibacterial effect, and Anhui Shuyuan Company develops antibacterial diapers with nano titanium dioxide as the main material. However, the safety of such inorganic antibacterial materials has yet to be verified, and the acceptance level of consumers is not high. Therefore, organic antibacterial diapers are a research hotspot in this industry. Chitosan is an organic antibacterial material and a natural biomass polysaccharide polymer material. It has many excellent properties such as good biocompatibility and microbial degradability. It is widely found in marine invertebrates (such as shrimp, In the shell of crab), the annual biosynthesis in nature is as high as 1 × 10 10 tons, which is the second largest natural polymer after cellulose; however, due to the similar molecular structure of chitosan and cellulose, its molecular structure is relatively small. The strong hydrogen bonding force makes it insoluble in water and most organic solvents, and exists in the form of precipitate, which limits its application.
发明内容SUMMARY OF THE INVENTION
鉴于现有技术的不足，本发明的目的在于提供一种天然抗菌无纺布及其制备方法。In view of the deficiencies of the prior art, the purpose of the present invention is to provide a natural antibacterial non-woven fabric and a preparation method thereof.
为实现上述目的，本发明采用如下技术方案：一种天然抗菌无纺布的制备方法，包括：由PP切片经纺粘法生产工艺制得纺粘无纺布；在所述纺粘无纺布上涂布壳聚糖分散液，干燥后即得到所述天然抗菌无纺布。In order to achieve the above purpose, the present invention adopts the following technical solutions: a method for preparing a natural antibacterial non-woven fabric, comprising: obtaining a spunbond non-woven fabric from PP slices through a spunbond production process; The chitosan dispersion is coated thereon, and the natural antibacterial non-woven fabric is obtained after drying.
优选地，所述壳聚糖分散液包括以下按质量百分数计的组分：水溶性改性壳聚糖0.3-1％，胶黏剂0.3-1％，其余为水。Preferably, the chitosan dispersion liquid includes the following components by mass percentage: 0.3-1% of water-soluble modified chitosan, 0.3-1% of adhesive, and the rest is water.
优选地，所述壳聚糖分散液的制备方法如下：先将所述质量百分数的各个组分倒入高速剪切分散设备中，得到混合溶液；再运用所述高速剪切分散设备对所述混合溶液进行剪切、分散，制成均匀的壳聚糖分散液。Preferably, the preparation method of the chitosan dispersion is as follows: first, pour each component of the mass percentage into a high-speed shear dispersing device to obtain a mixed solution; then use the high-speed shear dispersing device to disperse the The mixed solution is sheared and dispersed to prepare a uniform chitosan dispersion.
优选地，所述水溶性改性壳聚糖的制备方法如下：先利用固相力化学磨盘粉碎清洗好的海洋无脊椎动物壳体，然后采用物理多级剪切方式对其进行微纳米化，再在均相体系下进行脱乙酰化反应，制成脱乙酰度为50-60％的水溶性改性壳聚糖。Preferably, the preparation method of the water-soluble modified chitosan is as follows: firstly, the cleaned marine invertebrate shell is crushed by using a solid-phase force chemical grinding disc, and then micro-nano-sized by a physical multi-stage shearing method, Then, a deacetylation reaction is carried out in a homogeneous system to prepare a water-soluble modified chitosan with a deacetylation degree of 50-60%.
优选地，所述胶粘剂为水性聚氨酯和水性封端异氰酸酯的混合液。Preferably, the adhesive is a mixed solution of water-based polyurethane and water-based blocked isocyanate.
进一步优选地，所述水性聚氨酯和水性封端异氰酸酯的质量之比为7:3。Further preferably, the mass ratio of the water-based polyurethane and the water-based blocked isocyanate is 7:3.
进一步优选地，所述壳聚糖分散液还包括以下按质量百分数计的组分：亲水油剂6-10％。Further preferably, the chitosan dispersion also includes the following components in percent by mass: 6-10% of a hydrophilic oil agent.
再进一步优选地，所述亲水油剂为非离子表面活性剂。Still further preferably, the hydrophilic oil agent is a nonionic surfactant.
更进一步优选地，所述非离子表面活性剂包括以下按质量百分数计的组分：聚乙二醇脂肪酸酯71-73％，硅油22-26％，润湿剂1-3％，水2-4％。More preferably, the non-ionic surfactant includes the following components by mass percentage: polyethylene glycol fatty acid ester 71-73%, silicone oil 22-26%, wetting agent 1-3%, water 2% -4%.
更进一步优选地，所述润湿剂为磺基琥珀酸钠二辛酯。More preferably, the wetting agent is dioctyl sodium sulfosuccinate.
同时，本发明还提供一种由上述的制备方法制得的天然抗菌无纺布。Meanwhile, the present invention also provides a natural antibacterial non-woven fabric prepared by the above-mentioned preparation method.
与现有技术相比，本发明具有以下有益效果：本发明以天然生物质多糖高分子材料——壳聚糖作为有机抗菌原料，通过胶粘剂增强水溶性改性壳聚糖附着于纺粘无纺布上，能够对革兰氏阳性菌、革兰氏阴性菌起到有效的抑菌作用，使制备的天然抗菌无纺布具有优异的抗菌性能，无毒无污染，安全性极佳。Compared with the prior art, the present invention has the following beneficial effects: the present invention uses the natural biomass polysaccharide polymer material—chitosan as the organic antibacterial raw material, and the water-soluble modified chitosan is enhanced by the adhesive to attach to the spunbond nonwoven fabric. On the cloth, it can play an effective bacteriostatic effect on Gram-positive bacteria and Gram-negative bacteria, so that the prepared natural antibacterial non-woven fabric has excellent antibacterial properties, is non-toxic, non-polluting, and has excellent safety.
本发明制得的天然抗菌无纺布可以是具有抗菌功能的亲水无纺布或拒水无纺布，制作工艺简单，操作便捷，节省了人力及设备成本。The natural antibacterial non-woven fabric prepared by the invention can be a hydrophilic non-woven fabric or a water-repellent non-woven fabric with antibacterial function, and the production process is simple, the operation is convenient, and labor and equipment costs are saved.
具体实施方式Detailed ways
为使本领域的技术人员更好地理解本发明的技术方案，以下结合具体实施例对本发明做进一步详细说明，但本发明不限于以下实施例。In order to make those skilled in the art better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to specific embodiments, but the present invention is not limited to the following embodiments.
实施例1：Example 1:
一种天然抗菌无纺布的制备方法，包括：由PP切片经纺粘法生产工艺制得纺粘无纺布；在所述纺粘无纺布上涂布壳聚糖分散液，干燥后即得到所述天然抗菌无纺布。其中，所述壳聚糖分散液由以下按质量百分数计的组分组成：水溶性改性壳聚糖0.6％，亲水油剂8％，胶黏剂0.5％，其余为水(具体为去离子水)。A preparation method of a natural antibacterial non-woven fabric comprises: preparing a spunbond non-woven fabric from PP slices through a spunbond production process; coating a chitosan dispersion on the spun-bonded non-woven fabric, and drying The natural antibacterial non-woven fabric is obtained. Wherein, the chitosan dispersion liquid is composed of the following components by mass percentage: 0.6% of water-soluble modified chitosan, 8% of hydrophilic oil agent, 0.5% of adhesive, and the rest is water (specifically to remove ionized water).
在本实施例中，所述胶粘剂为水性聚氨酯和水性封端异氰酸酯的混合液，二者的质量之比为7:3。In this embodiment, the adhesive is a mixed solution of water-based polyurethane and water-based blocked isocyanate, and the mass ratio of the two is 7:3.
在本实施例中，所述亲水油剂为非离子表面活性剂，其包括以下按质量百分数计的组分：聚乙二醇脂肪酸酯72％，硅油24％，润湿剂1.5％，水2.5％。其中，所述润湿剂为磺基琥珀酸钠二辛酯。In this embodiment, the hydrophilic oil agent is a non-ionic surfactant, which includes the following components by mass percentage: polyethylene glycol fatty acid ester 72%, silicone oil 24%, wetting agent 1.5%, Water 2.5%. Wherein, the wetting agent is dioctyl sodium sulfosuccinate.
在本实施例中，所述天然抗菌无纺布的制备方法，具体包括以下步骤：In the present embodiment, the preparation method of the natural antibacterial non-woven fabric specifically includes the following steps:
(1)制备水溶性改性壳聚糖：先利用固相力化学磨盘粉碎清洗好的海洋无脊椎动物壳体，然后采用物理多级剪切方式对其进行微纳米化，再在均相体系下进行脱乙酰化反应，制成脱乙酰度为50-60％(本实施例优选但不局限于为55％)的水溶性改性壳聚糖。其中，所述脱乙酰化反应优选但不局限于在碱性条件(pH≥9，本实施例优选但不局限于pH＝10)下进行的。(1) Preparation of water-soluble modified chitosan: First, the cleaned marine invertebrate shells are crushed by solid-phase mechanical chemical grinding discs, and then micro-nano-sized by physical multi-stage shearing. A deacetylation reaction is carried out under the following conditions to prepare a water-soluble modified chitosan with a degree of deacetylation of 50-60% (preferably but not limited to 55% in this embodiment). Wherein, the deacetylation reaction is preferably but not limited to be carried out under alkaline conditions (pH≥9, in this embodiment preferably but not limited to pH=10).
(2)制备壳聚糖分散液：先将按原料配比称取好重量的水、亲水油剂、胶粘剂及水溶性改性壳聚糖依次倒入高速剪切分散设备中，得到混合溶液；再运用所述高速剪切分散设备对所述混合溶液进行剪切、分散，制成均匀的壳聚糖分散液，抽至储存箱(如油箱)备用。其中，所述高速剪切分散设备的工作速度优选但不局限于为13000-18000rpm，进一步优选为15000rpm，工作时间优选但不局限于为25-35min，进一步优选为30min。(2) Preparation of chitosan dispersion: firstly, pour the water, hydrophilic oil agent, adhesive and water-soluble modified chitosan that are weighed according to the ratio of raw materials into a high-speed shearing and dispersing device in turn to obtain a mixed solution Then use the high-speed shearing and dispersing equipment to shear and disperse the mixed solution to make a uniform chitosan dispersion, which is pumped to a storage tank (such as an oil tank) for use. Wherein, the working speed of the high-speed shearing dispersion device is preferably but not limited to 13000-18000rpm, more preferably 15000rpm, and the working time is preferably but not limited to 25-35min, more preferably 30min.
(3)制备天然抗菌无纺布：先将原料PP切片投入料槽，经螺杆挤出机熔融挤出，过滤计量后进行纺丝、牵伸、铺网，成网后通过轧机进行热轧加固，得到纺粘无纺布；再采用涂布辊上液，使壳聚糖分散液均匀地涂布在所述纺粘无纺布上，然后进入烘箱烘干，即得到所述天然抗菌无纺布，具体为天然抗菌亲水无纺布。(3) Preparation of natural antibacterial non-woven fabrics: first put the raw PP slices into the feed tank, melt and extrude through a screw extruder, filter and measure, spin, draw, and lay the net, and then pass through the rolling mill for hot-rolling reinforcement after the net is formed. , obtain the spunbond non-woven fabric; then use the coating roller to apply the liquid, so that the chitosan dispersion is evenly coated on the spunbond non-woven fabric, and then enter the oven to dry, that is, the natural antibacterial non-woven fabric is obtained. cloth, specifically a natural antibacterial hydrophilic non-woven fabric.
实施例2：Example 2:
一种天然抗菌无纺布的制备方法，与实施例1基本相同，不同之处在于：所述壳聚糖分散液由以下按质量百分数计的组分组成：水溶性改性壳聚糖1％，亲水油剂10％，胶黏剂1％，其余为水(具体为去离子水)；所述亲水油剂包括以下按质量百分数计的组分：聚乙二醇脂肪酸酯73％，硅油22％，润湿剂3％，水2％。The preparation method of a natural antibacterial non-woven fabric is basically the same as that in Example 1, except that the chitosan dispersion liquid is composed of the following components by mass percentage: water-soluble modified chitosan 1% , 10% hydrophilic oil agent, 1% adhesive, and the rest is water (specifically deionized water); the hydrophilic oil agent includes the following components by mass percentage: polyethylene glycol fatty acid ester 73% , silicone oil 22%, wetting agent 3%, water 2%.
实施例3：Example 3:
一种天然抗菌无纺布的制备方法，与实施例1基本相同，不同之处在于：所述壳聚糖分散液由以下按质量百分数计的组分组成：水溶性改性壳聚糖0.4％，亲水油剂8％，胶黏剂0.5％，其余为水(具体为去离子水)；所述亲水油剂包括以下按质量百分数计的组分：聚乙二醇脂肪酸酯71％，硅油26％，润湿剂1％，水2％。A preparation method of a natural antibacterial non-woven fabric is basically the same as that of Example 1, except that the chitosan dispersion liquid is composed of the following components by mass percentage: water-soluble modified chitosan 0.4% , 8% hydrophilic oil agent, 0.5% adhesive, and the rest is water (specifically deionized water); the hydrophilic oil agent includes the following components by mass percentage: polyethylene glycol fatty acid ester 71% , Silicone oil 26%, wetting agent 1%, water 2%.
实施例4：Example 4:
一种天然抗菌无纺布的制备方法，与实施例1基本相同，不同之处在于：所述壳聚糖分散液由以下按质量百分数计的组分组成：水溶性改性壳聚糖0.3％，亲水油剂6％，胶黏剂0.3％，其余为水(具体为去离子水)；所述亲水油剂包括以下按质量百分数计的组分：聚乙二醇脂肪酸酯71％，硅油22％，润湿剂3％，水4％。A preparation method of a natural antibacterial non-woven fabric is basically the same as that in Example 1, except that the chitosan dispersion liquid is composed of the following components by mass percentage: water-soluble modified chitosan 0.3% , 6% of hydrophilic oil agent, 0.3% of adhesive, and the rest is water (specifically deionized water); the hydrophilic oil agent includes the following components by mass percentage: polyethylene glycol fatty acid ester 71% , silicone oil 22%, wetting agent 3%, water 4%.
实施例5：Example 5:
一种天然抗菌无纺布的制备方法，与实施例1基本相同，不同之处在于：所述壳聚糖分散液由以下按质量百分数计的组分组成：水溶性改性壳聚糖0.6％，亲水油剂8％，胶黏剂0.3％，其余为水(具体为去离子水)；所述亲水油剂包括以下按质量百分数计的组分：聚乙二醇脂肪酸酯73％，硅油22％，润湿剂2％，水3％。A preparation method of a natural antibacterial non-woven fabric is basically the same as that in Example 1, except that the chitosan dispersion is composed of the following components in mass percentage: water-soluble modified chitosan 0.6% , 8% hydrophilic oil agent, 0.3% adhesive, and the rest is water (specifically deionized water); the hydrophilic oil agent includes the following components by mass percentage: polyethylene glycol fatty acid ester 73% , Silicone oil 22%, wetting agent 2%, water 3%.
实施例6：Example 6:
一种天然抗菌无纺布的制备方法，与实施例1基本相同，不同之处在于：所述壳聚糖分散液由以下按质量百分数计的组分组成：水溶性改性壳聚糖0.6％，胶黏剂0.5％，其余为水(具体为去离子水)；制得的天然抗菌无纺布具体为天然抗菌拒水无纺布。A preparation method of a natural antibacterial non-woven fabric is basically the same as that in Example 1, except that the chitosan dispersion is composed of the following components in mass percentage: water-soluble modified chitosan 0.6% , the adhesive is 0.5%, and the rest is water (specifically deionized water); the prepared natural antibacterial non-woven fabric is specifically a natural antibacterial and water-repellent non-woven fabric.
对比例1：Comparative Example 1:
一种天然抗菌无纺布的制备方法，与实施例1基本相同，不同之处在于：所述壳聚糖分散液由以下按质量百分数计的组分组成：水溶性改性壳聚糖0.6％，亲水油剂8％，其余为水(具体为去离子水)。A preparation method of a natural antibacterial non-woven fabric is basically the same as that in Example 1, except that the chitosan dispersion is composed of the following components in mass percentage: water-soluble modified chitosan 0.6% , 8% of hydrophilic oil, and the rest is water (specifically deionized water).
对比例2：Comparative Example 2:
一种天然抗菌无纺布的制备方法，与实施例1基本相同，不同之处在于：所述壳聚糖分散液由以下按质量百分数计的组分组成：亲水油剂8％，胶黏剂0.5％，其余为水(具体为去离子水)。A preparation method of a natural antibacterial non-woven fabric is basically the same as that in Example 1, except that the chitosan dispersion is composed of the following components by mass percentage: hydrophilic oil agent 8%, adhesive agent 0.5%, and the rest is water (specifically deionized water).
下面对本发明实施例1至实施例6和对比例1至对比例2得到的天然抗菌无纺布分别进行抗菌性能测试，测试结果如表1所示。The antibacterial properties of the natural antibacterial non-woven fabrics obtained from Examples 1 to 6 and Comparative Examples 1 to 2 of the present invention are respectively carried out below, and the test results are shown in Table 1.
抗菌性能的测试方法参考GB/T 15979-2002附录C4溶出性抗(抑)菌产品抑菌性能试验方法，测试其对金黄色葡萄球菌、大肠杆菌的20分钟抑菌率；参考ASTM E 2149-2013a动态接触条件下固定抗菌剂的抗菌性能测试，测试其对金黄色葡萄球菌、大肠杆菌的“24h”抑菌率。The test method of antibacterial performance refers to GB/T 15979-2002 Appendix C4 Test method for antibacterial performance of dissolving antibacterial (antibacterial) products to test the 20-minute antibacterial rate of Staphylococcus aureus and Escherichia coli; refer to ASTM E 2149- 2013a Antibacterial performance test of immobilized antibacterial agent under dynamic contact conditions, to test its "24h" bacteriostatic rate against Staphylococcus aureus and Escherichia coli.
表1：各实施例和对比例的抗菌测试结果Table 1: Antibacterial test results of each example and comparative example
从上表可以看出，本发明制得的天然抗菌无纺布抗菌性能优异，抗菌效果好。As can be seen from the above table, the natural antibacterial non-woven fabric prepared by the present invention has excellent antibacterial performance and good antibacterial effect.
本发明中的水溶性改性壳聚糖对革兰氏阳性菌的抑菌机理：壳聚糖通过其自身带正电荷的质子化氨基，与革兰氏阳性菌的菌体细胞壁的肽聚糖的N-乙酰胞壁酸和磷壁酸等相结合，导致菌体细胞壁变形甚至破裂，使菌体细胞膜直接受到外界环境渗透压的冲击，造成菌体胞质重要成分外泄，最终导致菌体死亡。The antibacterial mechanism of the water-soluble modified chitosan in the present invention to Gram-positive bacteria: chitosan interacts with the peptidoglycan of the cell wall of Gram-positive bacteria through its own positively charged protonated amino group. The combination of N-acetylmuramic acid and teichoic acid, etc., leads to the deformation or even rupture of the cell wall of the cell, so that the cell membrane of the cell is directly impacted by the osmotic pressure of the external environment, resulting in the leakage of important components of the cell cytoplasm, which eventually leads to the cell. die.
本发明中的水溶性改性壳聚糖对革兰氏阴性菌的抑菌机理：革兰氏阴性菌的菌细胞壁除肽聚糖外，还有一层由脂多糖、蛋白质与+2价金属离子通过静电力结合在一起的外膜包被，壳聚糖可以与其外膜脂多糖中带负电的O-特异抗原性的寡糖重复单元结合，阻止营养物质进入细胞，从而使细菌因缺乏营养而死亡，或阻断细菌体内DNA的转录从而抑制细菌繁殖。The antibacterial mechanism of the water-soluble modified chitosan in the present invention to Gram-negative bacteria: In addition to peptidoglycan, the bacterial cell wall of Gram-negative bacteria has a layer of lipopolysaccharide, protein and +2-valent metal ions Through the outer membrane coating held together by electrostatic force, chitosan can bind to the negatively charged O-specific antigenic oligosaccharide repeating units in its outer membrane lipopolysaccharide, preventing nutrients from entering the cells, thus causing bacteria to become depleted due to lack of nutrients. Death, or blocking the transcription of DNA in bacteria to inhibit bacterial reproduction.
以上仅是本发明的优选实施方式，不应视为对本发明的限制，本发明的保护范围应当以权利要求所限定的范围为准。对于本技术领域的普通技术人员来说，在不脱离本发明的精神和范围内，还可以进行若干改进，这些改进也应视为本发明的保护范围。The above are only preferred embodiments of the present invention, and should not be regarded as a limitation of the present invention, and the protection scope of the present invention should be based on the scope defined by the claims. For those skilled in the art, several improvements can be made without departing from the spirit and scope of the present invention, and these improvements should also be regarded as the protection scope of the present invention.
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