Non-woven fabric for PLA melt-blown calendaring filtration

Abstract

The utility model discloses a PLA melt-blown calendaring filtering non-woven fabric which comprises a non-woven fabric body, and the non-woven fabric body comprises a composite filtering layer and two PLA melt-blown calendaring non-woven fabric layers. The composite filter layer is arranged between the two PLA melt-blown calendaring non-woven fabric layers; the composite filter layer and the PLA melt-blown calendaring non-woven fabric layer are compounded through hot pressing; the composite filter layer comprises an adsorption layer, an antibacterial layer and a filter layer which are compounded with one another; the antibacterial layer is arranged between the adsorption layer and the filtering layer. Based on the PLA melt-blown calendaring filtering non-woven fabric, the adsorption layer can adsorb dyes, pigments and some organic matters and small particles; the antibacterial layer can effectively reduce reproduction of bacteria and mould; the filtering layer has very high filtering efficiency on small particles, and the situation that the filtering efficiency of common electret melt-blown cloth is lost due to charge loss is avoided; the PLA melt-blown calendaring non-woven fabric layer not only has higher filtering precision than common non-woven fabric, but also has a smoother surface, a filter cake is easier to fall off, and the liquid-solid separation effect is more ideal.

Description

Technical Field

[0001] The utility model relates to the technical field of non-woven fabrics, in particular to a PLA melt-blown calendered non-woven fabric for filtering. Background Art

[0002] Non-woven fabrics, also known as non-woven fabrics, are made of directional or random fibers. They are called cloth because they have the appearance and certain properties of cloth. They are moisture-proof, breathable, flexible, lightweight, non-combustible, easy to decompose, non-toxic and non-irritating, colorful, low-priced, and recyclable. They are often used as filter materials, oil-absorbing materials, sanitary materials, etc. Generally speaking, non-woven fabrics used for water filtration are places where bacteria and molds breed. Long-term use will have an adverse effect on the filtration effect due to the growth of bacteria and molds; common non-woven fabrics for filtration also have the disadvantages of the filter cloth surface not being smooth enough, the filter cake not being easy to fall off, and the liquid-solid separation effect not being ideal. Utility Model Content

[0003] The utility model aims to provide a PLA melt-blown calendered filtering nonwoven fabric, which aims to solve the problems raised in the above-mentioned background technology.

[0004] In order to solve the above technical problems, the purpose of the utility model is achieved as follows: a PLA melt-blown calendered non-woven fabric for filtration, comprising: a non-woven fabric body, the non-woven fabric body comprising a composite filter layer and two layers of PLA melt-blown calendered non-woven fabric layers; the composite filter layer is arranged between the two layers of the PLA melt-blown calendered non-woven fabric layers; the composite filter layer and the PLA melt-blown calendered non-woven fabric layer are composited by hot pressing; the composite filter layer comprises a composite adsorption layer, an antibacterial layer and a filtration layer; the antibacterial layer is arranged between the adsorption layer and the filtration layer.

[0005] On the basis of the above scheme and as a preferred scheme of the above scheme: the adsorption layer is activated carbon loaded with titanium dioxide modified polypropylene melt-blown non-woven fabric.

[0006] On the basis of the above solution and as a preferred solution of the above solution: the antibacterial layer is a bamboo fiber non-woven fabric.

[0007] On the basis of the above scheme and as a preferred scheme of the above scheme: the filter layer is a sandwich structure, including a surface layer and a middle layer, the surface layer is meltblown cloth, and the middle layer is PA6 nanofiber.

[0008] On the basis of the above scheme and as a preferred scheme of the above scheme: the adsorption layer, the antibacterial layer and the filtration layer are compounded by hot pressing.

[0009] The beneficial effects of the utility model are as follows: based on the PLA melt-blown calendered filter non-woven fabric of the utility model, dyes, pigments, some organic matter and tiny particles are adsorbed through the adsorption layer; the antibacterial layer can effectively reduce the reproduction of bacteria and mold; the filter layer has a high filtration efficiency for tiny particles, and the situation in which ordinary electret melt-blown fabric loses its filtration efficiency due to charge loss will not occur; the PLA melt-blown calendered non-woven fabric layer not only has a higher filtration accuracy than ordinary non-woven fabrics, but also has a smoother surface, the filter cake is easier to fall off, and the liquid-solid separation effect is more ideal. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic structural diagram of the PLA melt-blown calendered filter nonwoven fabric involved in the utility model;

[0011] Figure 2 It is a structural schematic diagram of the composite filter layer involved in the utility model;

[0012] In the figure: 1-composite filter layer, 2-PLA melt-blown calendered non-woven fabric layer, 3-adsorption layer, 4-antibacterial layer, 5-filter layer. DETAILED DESCRIPTION

[0013] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0014] Combination Figure 1-2 The present embodiment is described in detail. A PLA melt-blown calendered non-woven fabric for filtration comprises: a non-woven fabric body, wherein the non-woven fabric body comprises a composite filter layer 1 and two layers of PLA melt-blown calendered non-woven fabric layers 2; the composite filter layer 1 is arranged between the two layers of the PLA melt-blown calendered non-woven fabric layers 2; the composite filter layer 1 and the PLA melt-blown calendered non-woven fabric layer 2 are composited by hot pressing; the composite filter layer 1 comprises a composite adsorption layer 3, an antibacterial layer 4 and a filtration layer 5; the antibacterial layer 4 is arranged between the adsorption layer 3 and the filtration layer 5.

[0015] The PLA meltblown calendered nonwoven fabric layer 2 is a PLA meltblown nonwoven fabric that has been calendered. It is tighter than ordinary nonwoven fabrics and has higher filtering accuracy as a filter material. At the same time, the surface of the nonwoven fabric is smoother, the filter cake is easier to fall off, and the liquid-solid separation effect is more ideal.

[0016] Furthermore, the adsorption layer 3 is an activated carbon-loaded titanium dioxide-modified polypropylene melt-blown nonwoven fabric. Specifically, the preparation process of the activated carbon-loaded titanium dioxide-modified polypropylene melt-blown nonwoven fabric is as follows: pre-treating the activated carbon, soaking it in concentrated hydrochloric acid for 24 hours for pickling, repeatedly filtering it with deionized water for 5 times, and drying it at 150°C to obtain activated carbon powder; doping, mixing, extracting, and drying titanium dioxide and activated carbon according to a mass ratio of titanium dioxide to activated carbon of 1:3 to obtain activated carbon-loaded titanium dioxide powder; blending the activated carbon-loaded titanium dioxide powder with polypropylene, and melt-blowing to prepare an activated carbon-loaded titanium dioxide-modified polypropylene melt-blown nonwoven fabric. Nano-titanium dioxide is one of the most widely used nanomaterials, with good ability to scatter and absorb ultraviolet light, high far-infrared radiation ability and photocatalytic performance. As a photocatalyst, it is harmless and non-toxic, with a stable structure, and the photogenerated holes in the molecular structure have strong oxidizing properties. The pore structure of activated carbon has a large specific surface area, and its molecular structure gives it unique adsorption properties, which can adsorb dyes, pigments, some organic matter and tiny particles. Utilizing the excellent properties of both titanium dioxide and activated carbon, the titanium dioxide-modified polypropylene non-woven fabric is melt-blown with polypropylene to have good adsorption properties and can be used in water treatment, pollutant filtration, chemical reagent post-treatment and other aspects.

[0017] Furthermore, the antibacterial layer 5 is a bamboo fiber non-woven fabric. Bamboo fiber is a cellulose fiber extracted from naturally grown bamboo. The non-woven fabric made of bamboo fiber has natural antibacterial, antibacterial and bactericidal effects. Under a microscope, bacteria can multiply in large quantities in fiber products such as cotton and wood, while bacteria on bamboo fiber products not only cannot survive for a long time, but also disappear or decrease in a short time, and the bacterial mortality rate within 24 hours is more than 75%.

[0018] Furthermore, the filter layer 6 is a sandwich structure, including a surface layer and an intermediate layer, the surface layer is a meltblown cloth, and the intermediate layer is a PA6 nanofiber membrane. PA6, as a common raw material for electrospinning, has good spinnability, heat resistance and chemical stability, and is widely used in air filtration, sewage treatment, biotechnology and the like. Specifically, a layer of PP meltblown cloth and a high-temperature resistant polyester fiber mesh cloth are sequentially covered on the surface of the PA6 nanofiber membrane, and then a single-sided hot pressing bonding is performed by a hot pressing device. After hot pressing, the polyester fiber mesh falls off, and a filter layer 6 with a sandwich structure is obtained. The filter layer 6 has a good filtering effect. The PP meltblown cloth has many gaps, a fluffy structure, and good wrinkle resistance. The ultrafine fibers with a unique capillary structure increase the number and surface area of ​​fibers per unit area, so that the meltblown cloth has good filtering properties, and the PA6 nanofiber membrane has a high filtering efficiency for tiny particles without the need for electret treatment, and the ordinary electret meltblown cloth will not lose its filtering efficiency due to charge loss.

[0019] Furthermore, the adsorption layer 3, the antibacterial layer 4 and the filtration layer 5 are compounded by hot pressing.

[0020] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. A PLA melt-blown calendered nonwoven fabric for filtration, comprising: The non-woven fabric body is characterized in that the non-woven fabric body comprises a composite filter layer (1) and two layers of PLA melt-blown calendered non-woven fabric layers (2); the composite filter layer (1) is arranged between the two layers of the PLA melt-blown calendered non-woven fabric layers (2); the composite filter layer (1) and the PLA melt-blown calendered non-woven fabric layers (2) are composited by hot pressing; the composite filter layer (1) comprises a composite adsorption layer (3), an antibacterial layer (4) and a filter layer (5); the antibacterial layer (4) is arranged between the adsorption layer (3) and the filter layer (5).

2. A PLA melt-blown calendered nonwoven fabric for filtration according to claim 1, characterized in that: The adsorption layer (3) is an activated carbon-loaded titanium dioxide-modified polypropylene melt-blown non-woven fabric.

3. A PLA melt-blown calendered nonwoven fabric for filtration according to claim 1, characterized in that: The antibacterial layer (4) is a bamboo fiber non-woven fabric.

4. A PLA melt-blown calendered nonwoven fabric for filtration according to claim 1, characterized in that: The filter layer (5) is a sandwich structure, comprising a surface layer and a middle layer, the surface layer is a meltblown cloth, and the middle layer is a PA6 nanofiber membrane.

5. The PLA melt-blown calendered nonwoven fabric for filtration according to claim 1, characterized in that: The adsorption layer (3), the antibacterial layer (4) and the filtration layer (5) are composited by hot pressing.

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