A stain-resistant spunbond nonwoven fabric and its preparation process

Abstract

This application relates to fiber products, specifically disclosing a stain-resistant spunbond nonwoven fabric and its preparation process. The nonwoven fabric is composed of two or more layers of fiber webs bonded together. The two outermost fiber webs are stain-resistant fiber webs, and the surface of the fibers or part of the fibers of the stain-resistant fiber webs is loaded with a stain-resistant component. The stain-resistant component includes the following components in parts by weight: 10-13 parts of a barrier agent; the barrier agent is one of beeswax, palm wax, polydimethylsiloxane phosphate, and polydimethylsiloxane stearate; and 1-1.2 parts of an antioxidant. The content of the barrier agent in the stain-resistant fiber web is 0.82-1.04 wt%. The spunbond nonwoven fabric of this application is bonded, densified, and has good stain-resistant and antibacterial properties. Therefore, from the perspective of preventing the contact and absorption of leakage liquid, it solves the problem that nonwoven fabrics are easily contaminated with organic matter and breed bacteria when packaged and placed in food and ingredients, thus affecting reuse.

Description

Technical Field

[0001] This invention relates to the field of fiber products, and more specifically, to a stain-resistant spunbond nonwoven fabric and its preparation process. Background Technology

[0002] Non-woven fabric, also known as nonwoven cloth, is currently classified into needle-punched non-woven fabric, spunlace non-woven fabric, hot-air non-woven fabric, and spunbond non-woven fabric according to the production process. It directly bonds polymer materials and fibers together, making it lightweight, flame-retardant, non-toxic, odorless, inexpensive, and recyclable.

[0003] Currently, many food transport packaging and shopping bags are made of non-woven fabric. When food or ingredients are placed in these bags, they easily become contaminated with liquids from the surface of the food or ingredients, such as the exudate from broken fruit or the tissue fluid of meat, poultry, and aquatic products, which contains a significant amount of organic matter. For ease of description below, this exudate or dripping liquid from food or ingredients will be referred to as exudate. Because non-woven fabric fibers are porous, have low strength, and are not washable, this type of liquid is difficult to remove once absorbed. Although the polymer fibers of non-woven fabric are not easily deteriorated, the liquid remaining in the gaps between the fibers can deteriorate and breed bacteria, affecting the reusability of the bag.

[0004] Therefore, the applicant has obtained a stain-resistant spunbond nonwoven fabric suitable for food transport packaging or shopping bags. Summary of the Invention

[0005] To address the problem that nonwoven fabrics are easily contaminated with organic matter and breed bacteria during food and ingredient packaging and storage, thus affecting their reusability, this application provides a stain-resistant spunbond nonwoven fabric and its preparation process.

[0006] In a first aspect, this application provides a stain-resistant spunbond nonwoven fabric, employing the following technical solution:

[0007] A stain-resistant spunbond nonwoven fabric is composed of two or more layers of fiber webs bonded together. The two outermost fiber webs are stain-resistant fiber webs, and the surface of the fibers or part of the fibers of the stain-resistant fiber webs is loaded with stain-resistant components.

[0008] The antifouling component comprises the following components in parts by weight:

[0009] 10-13 parts of an absorbent blocker; the absorbent blocker is one of beeswax, palm wax, polydimethylsiloxane phosphate, and polydimethylsiloxane alcohol stearate.

[0010] Antioxidant 1 to 1.2 parts;

[0011] The antifouling fiber mesh contains 0.82–1.04 wt% of an anti-absorption agent.

[0012] The applicant attempted to use silver ion carrier filler mixed into nonwoven fibers to inhibit bacterial growth. However, when the amount of silver ion carrier filler mixed in is less than 5 wt% of the fiber, its antibacterial effect can only reduce the antibacterial effect of the polymer fiber itself and cannot inhibit the organic matter that has penetrated into the nonwoven fabric. On the other hand, the filler mixed in too much silver ion carrier makes the polymer fiber spinning process difficult and the fiber is easy to break during spinning. The resulting nonwoven fabric is easy to decompose under the action of silver ions and its strength decreases rapidly during its service life.

[0013] By adopting the above technical solution, the antifouling component of this application improves the hydrophobicity of the fibers in the antifouling fiber web. After the antifouling fiber web or other fiber webs are bonded together to form a spunbond nonwoven fabric, the antifouling fiber web forms both sides of the spunbond nonwoven fabric, and the fibers in the antifouling fiber web are more dense. The dense network formed by the enhanced hydrophobicity of the fine fibers hinders the penetration of exudate into the spunbond nonwoven fabric. The spunbond nonwoven fabric of this application absorbs less exudate, thus the exudate can be easily removed from the spunbond nonwoven fabric by shaking or wiping.

[0014] The nonwoven fabric used in this application is spunbond nonwoven fabric. The production process of spunbond nonwoven fabric includes heating and hot rolling of the fiber web. In the production process of the spunbond nonwoven fabric of this application, the antifouling component includes a blocking agent. During heating and hot rolling, the blocking agent diffuses in the area formed by the antifouling fiber web as the antifouling fiber web becomes denser, thereby dispersing more evenly in the area formed by the antifouling fiber web and improving the antifouling and antibacterial effect. At the same time, the blocking agent also diffuses to other fiber web layers of the spunbond nonwoven fabric under heating and hot rolling, thereby strengthening the adhesion, promoting the densification of the spunbond nonwoven fabric of this application, and improving the antifouling performance.

[0015] In summary, the spunbond nonwoven fabric of this application is bonded, densified, and has good antifouling and antibacterial properties. Thus, from the perspective of preventing the absorption of leachate, it solves the problem that nonwoven fabrics are easily contaminated with organic matter and breed bacteria when packaging and storing food and ingredients, which affects their reusability.

[0016] In addition, considering food safety factors, the absorbents selected in this application are mostly those that can be accelerated to oxidize under UV irradiation. Therefore, in order to extend the antifouling time to match the expected service life of spunbond nonwoven fabric, an antioxidant is added in this application. Optionally, the absorbent is one of polydimethylsiloxane phosphate or polydimethylsiloxane alcohol stearate.

[0017] By adopting the above technical solutions, beeswax, palm wax, polydimethylsiloxane phosphate, and polydimethylsiloxane stearate in this application can simultaneously meet the requirements for antifouling modification and food safety. Among them, polydimethylsiloxane phosphate and polydimethylsiloxane stearate can react with the free groups on the fiber surface, resulting in better bonding and better and longer-lasting antifouling performance.

[0018] Optional: The antioxidant is one of sorbic acid and ethyl sorbate.

[0019] By adopting the above technical solutions, sorbic acid and ethyl sorbate not only have antioxidant effects, but also ensure food safety and have broad-spectrum antibacterial effects.

[0020] Optionally, the absorbent is one of polydimethylsiloxane phosphate or polydimethylsiloxane alcohol stearate, and the antioxidant is ethyl sorbate.

[0021] By adopting the above technical solution, sorbic acid, compared with ethyl sorbate, weakens the stability of the fiber surface bonded by polydimethylsiloxane phosphate and polydimethylsiloxane alcohol stearate. The combination of polydimethylsiloxane phosphate / polydimethylsiloxane alcohol stearate and ethyl sorbate has a better and longer-lasting anti-fouling and antibacterial effect.

[0022] Optionally, the antifouling fiber mesh contains 1.5 to 4.2 wt% of an adsorbent, wherein the adsorbent is one of nano-silica, nano-calcium carbonate, or nano-alumina.

[0023] By adopting the above technical solution, the adsorbent contained in the fiber can improve the adhesion and bonding stability of the fiber surface barrier agent, so that the anti-fouling and antibacterial effect of the nonwoven fabric of this application is better retained after a period of use.

[0024] Optional: The adsorbent is nano-calcium carbonate.

[0025] By adopting the above technical solution, nano-calcium carbonate, as an adsorbent, retains its anti-fouling and antibacterial effects better than nano-silica after a period of use, and has a higher fiber yield than nano-alumina.

[0026] Secondly, this application provides a process for preparing spunbond nonwoven fabric, which adopts the following technical solution:

[0027] The preparation process of spunbond nonwoven fabric includes the following steps:

[0028] After the polymer is extruded and stretched to form continuous filament fibers, an antifouling modification liquid is sprayed onto the filament fibers, and after drying, modified fibers are obtained. The modified fibers are laid into a web to obtain an antifouling fiber web.

[0029] The antifouling modified liquid is obtained by dispersing the antifouling component in a dispersion liquid, and the long filament fiber is insoluble in the dispersion liquid.

[0030] By adopting the above technical solution, the antifouling modified liquid is first sprayed onto the filament fibers to obtain modified fibers, and then the fibers are laid into a web to obtain an antifouling fiber web. This makes the antifouling components more evenly distributed on the fibers, and the antifouling components diffuse more widely during subsequent heating and hot rolling. This results in a high proportion of antifouling components adhering to the antifouling fiber web in the area of ​​the spunbond nonwoven fabric and even within the fibers of the spunbond nonwoven fabric, thereby achieving a good and longer-lasting antifouling and antibacterial effect.

[0031] Optionally, the dispersion is acetone.

[0032] By adopting the above technical solution, the spunbond nonwoven fabric in this application uses one or more of polypropylene and polyethylene as the main fiber components. In this case, acetone is selected as the dispersion liquid, which is convenient to remove and has little impact on the fiber itself.

[0033] In summary, the present invention has the following beneficial effects:

[0034] 1. The spunbond nonwoven fabric of this application contains antifouling components, which makes the spunbond nonwoven fabric of this application bonded, dense and has good antifouling and antibacterial properties. Thus, from the perspective of preventing the contact and absorption of leakage liquid, it solves the problem that nonwoven fabric is easily contaminated with organic matter and breeds bacteria when food and food packaging and storage, which affects the reuse.

[0035] 2. The antioxidants in this application are sorbic acid and ethyl sorbate, which have antioxidant effects, are safe to eat, and have broad-spectrum antibacterial effects.

[0036] 3. The adsorbent contained in the fibers of the spunbond nonwoven fabric raw material of this application can improve the adhesion and bonding stability of the resisting agent on the fiber surface, so that the anti-fouling and antibacterial effect of the spunbond nonwoven fabric of this application is better retained after a period of use. Detailed Implementation

[0037] Raw material source:

[0038] Polypropylene: Exxon CNU013.

[0039] Low-density polyethylene: Exxon LD165BW1.

[0040] Nano calcium carbonate, nano silicon dioxide, nano aluminum oxide: Foshan Hongsheng Powder Technology Co., Ltd.

[0041] Polydimethylsiloxane phosphate: Hubei Yunmei (Chemical) Technology Co., Ltd.

[0042] Beeswax: Wuhan Penglei Biotechnology Co., Ltd.

[0043] Palm wax: Wuhan Penglei Biotechnology Co., Ltd.

[0044] Polydimethylsiloxane alcohol stearate: Foshan Yinmei United Chemical Technology Co., Ltd.

[0045] Sorbic acid: Wanglong Group Co., Ltd.

[0046] Ethyl sorbate: Wuhan Prof Biotechnology Co., Ltd.

[0047] Example 1

[0048] A stain-resistant spunbond nonwoven fabric is obtained by bonding two layers of stain-resistant fiber webs, the stain-resistant fiber webs comprising fiber webs and stain-resistant components loaded on the fiber webs.

[0049] The antifouling components include an absorbent and an antioxidant. The absorbent is polydimethylsiloxane stearate, and the antioxidant is ethyl sorbate.

[0050] The method for preparing stain-resistant spunbond nonwoven fabric is as follows:

[0051] S1 mixes polypropylene, polyethylene, and adsorbent in a mass ratio of 65:32:3 and then performs melt extrusion granulation. The melt extrusion conditions are: twin-screw extrusion processing temperature of 182℃, main screw speed of 250r / min, and feed screw speed of 18r / min to obtain fiber masterbatch.

[0052] S2 fiber masterbatch is melt-extruded and then spun to obtain filament fibers;

[0053] S3 is prepared by spraying the antifouling modifying liquid onto the filament fibers at a mass ratio of 100:5, mixing them evenly, and then opening them after drying to obtain modified fibers.

[0054] The antifouling modified liquid is formed by dispersing an absorbent and an antioxidant in a dispersion, wherein the mass ratio of the absorbent, the antioxidant, and the dispersion is 12:1:50, and the dispersion is acetone.

[0055] S4 uses airflow to draw modified fibers into a web, resulting in a stain-resistant fiber web;

[0056] S5 involves stacking two layers of antifouling fiber mesh and hot rolling them together at a temperature of 148°C, with the upper roller pressure at 14MPa and the lower roller pressure at 8MPa, to obtain spunbond nonwoven fabric.

[0057] Example 2

[0058] A stain-resistant spunbond nonwoven fabric, similar to Example 1, except that the absorbent is beeswax.

[0059] Example 3

[0060] A stain-resistant spunbond nonwoven fabric, similar to Example 1, except that the absorbent is palm wax.

[0061] Example 4

[0062] A stain-resistant spunbond nonwoven fabric, similar to Example 1, except that the absorbent is polydimethylsiloxane phosphate.

[0063] Comparative Example 1

[0064] A spunbond nonwoven fabric differs from Example 1 in that, in S3, an antioxidant and a dispersion mixture in a mass ratio of 1:50 are used to replace the antifouling modifier in the same mass ratio. The mixture is sprayed onto the filament fibers to obtain a control fiber. The control fiber is then drawn into a web using an airflow to obtain a control fiber web. Finally, the control fiber is replaced with the antifouling fiber web and hot-rolled to produce the final product.

[0065] Comparative Example 2

[0066] A spunbond nonwoven fabric, which differs from Example 1 in that, in S3, untreated filament fibers are used instead of modified fibers, and a comparative fiber web is obtained by airflow drawing. The comparative fibers are then replaced with antifouling fiber webs and hot-rolled to produce the fabric.

[0067] Comparative Example 3

[0068] A spunbond nonwoven fabric differs from Example 1 in that, in S3, a mixture of absorbent and dispersion liquid in a mass ratio of 12:50 is used instead of the antifouling modifier liquid. This mixture is sprayed onto the filament fibers to obtain a control fiber. The control fiber is then drawn into a web using an airflow to obtain a control fiber web. Finally, the control fiber web is replaced with the antifouling fiber web by hot rolling to produce the final product.

[0069] Example 5

[0070] A stain-resistant spunbond nonwoven fabric, similar to Example 1, except that the antioxidant is sorbic acid.

[0071] Example 6

[0072] A stain-resistant spunbond nonwoven fabric, similar to Example 1, except that the absorbent is polydimethylsiloxane phosphate and the antioxidant is sorbic acid.

[0073] Example 7

[0074] A stain-resistant spunbond nonwoven fabric, similar to Example 1, except that the absorbent is beeswax and the antioxidant is sorbic acid.

[0075] Example 8

[0076] A stain-resistant spunbond nonwoven fabric, similar to Example 1, except that the absorbent is palm wax and the antioxidant is sorbic acid.

[0077] Example 9

[0078] A stain-resistant spunbond nonwoven fabric, similar to Example 1, except that the mass ratio of the anti-absorption agent, antioxidant, and dispersion in the stain-resistant modified liquid is 10:1:50.

[0079] Example 10

[0080] A stain-resistant spunbond nonwoven fabric, similar to Example 1, except that the mass ratio of the anti-absorption agent, antioxidant, and dispersion in the stain-resistant modified liquid is 13:1:50.

[0081] Example 11

[0082] A stain-resistant spunbond nonwoven fabric, similar to Example 1, except that in S3, the amount of stain-resistant modifying liquid used is 3.7 parts by weight of stain-resistant modifying liquid added per 100 parts by weight of filament fiber.

[0083] Example 12

[0084] A stain-resistant spunbond nonwoven fabric, similar to Example 1, except that in S3, the amount of stain-resistant modifying liquid used is 5.5 parts by weight of stain-resistant modifying liquid added per 100 parts by weight of filament fiber.

[0085] Comparative Example 4

[0086] A stain-resistant spunbond nonwoven fabric differs from Example 1 in that the mass ratio of the anti-fouling modifier, antioxidant, and dispersion in the stain-resistant modified liquid is 18:1:50.

[0087] Comparative Example 5

[0088] A stain-resistant spunbond nonwoven fabric, which differs from Example 1 in that the amount of stain-resistant modifying liquid used in S3 is 7 parts by weight of stain-resistant modifying liquid per 100 parts by weight of filament fiber.

[0089] Example 13

[0090] A stain-resistant spunbond nonwoven fabric, similar to Example 1, except that the mass ratio of the anti-absorption agent, antioxidant, and dispersion in the stain-resistant modified liquid is 12:1.2:50.

[0091] Example 14

[0092] A stain-resistant spunbond nonwoven fabric, similar to Example 1, except that the mass ratio of the anti-absorption agent, antioxidant, and dispersion in the stain-resistant modified liquid is 12:1.5:50.

[0093] Example 15

[0094] A stain-resistant spunbond nonwoven fabric, similar to Example 1, except that the fiber masterbatch in S1 is obtained by melt extrusion granulation after uniformly mixing polypropylene and polyethylene at a mass ratio of 65:32.

[0095] Comparative Example 6

[0096] A spunbond nonwoven fabric, similar to Comparative Example 2, is distinguished from the one in which the fiber masterbatch in S1 is obtained by melt extrusion granulation after uniformly mixing polypropylene and polyethylene in a mass ratio of 65:32.

[0097] Example 16

[0098] A stain-resistant spunbond nonwoven fabric, similar to Example 1, except that the adsorbent in S1 is nano-silica.

[0099] Example 17

[0100] A stain-resistant spunbond nonwoven fabric, similar to Example 1, except that the adsorbent in S1 is nano-alumina.

[0101] Example 18

[0102] A stain-resistant spunbond nonwoven fabric, similar to Example 1, except that in S1 the fiber masterbatch is obtained by melt extrusion granulation after uniformly mixing polypropylene, polyethylene and adsorbent in a mass ratio of 66:33:1.

[0103] Example 19

[0104] A stain-resistant spunbond nonwoven fabric, similar to Example 1, except that in S1 the fiber masterbatch is obtained by melt extrusion granulation after uniformly mixing polypropylene, polyethylene and adsorbent in a mass ratio of 66:32.5:1.5.

[0105] Example 20

[0106] A stain-resistant spunbond nonwoven fabric, similar to Example 1, except that in S1 the fiber masterbatch is obtained by melt extrusion granulation after uniformly mixing polypropylene, polyethylene and adsorbent in a mass ratio of 63.8:32:4.2.

[0107] Example 21

[0108] A stain-resistant spunbond nonwoven fabric, similar to Example 1, except that in S1 the fiber masterbatch is obtained by melt extrusion granulation after uniformly mixing polypropylene, polyethylene and adsorbent in a mass ratio of 62.9:31.5:5.6.

[0109] Example 22

[0110] A stain-resistant spunbond nonwoven fabric, similar to Example 1, except that the dispersion in the stain-resistant modified liquid is ethanol.

[0111] Example 23

[0112] A stain-resistant spunbond nonwoven fabric, similar to Example 1, except that in S1 the fiber masterbatch is obtained by melt extrusion granulation after uniformly mixing polypropylene, polyethylene and adsorbent in a mass ratio of 50:47:3.

[0113] Example 24

[0114] A stain-resistant spunbond nonwoven fabric, similar to Example 1, except that in S1 the fiber masterbatch is obtained by melt extrusion granulation after uniformly mixing polypropylene, polyethylene and adsorbent in a mass ratio of 37:60:3.

[0115] The spunbond nonwoven fabrics obtained in Examples 1-24 and Comparative Examples 1-6 were tested.

[0116] Stain resistance: The liquid absorption of spunbond nonwoven fabric was tested according to standard GB / T 24218.6-2010, with milk as the test liquid.

[0117] Long-lasting anti-fouling performance: After the spunbond nonwoven fabric was unfolded and placed in a well-ventilated indoor environment, the liquid absorption of the spunbond nonwoven fabric was tested according to standard GB / T 24218.6-2010. The test liquid was milk.

[0118] The detection structure is shown in Table 1 below. Additionally, the amount of hindering agent used in the antifouling fiber web is calculated as the weight percentage of the hindering agent in the antifouling fiber web and is included in Table 1.

[0119] Table 1. Detection results of Examples 1-24 and Comparative Examples 1-6

[0120]

[0121]

[0122] *Comparative Examples 4 and 5 show a more pronounced waxy texture on the surface of the spunbond nonwoven fabric compared to Examples 1-24, and feel oily to the touch.

[0123] Referring to Table 1, and comparing Examples 1-3 with Comparative Example 2, it can be seen that the spunbond nonwoven fabric of this application contains antifouling components, which effectively hinder the absorption of liquid by the spunbond nonwoven fabric and significantly reduce the amount of liquid absorbed by the spunbond nonwoven fabric from milk. The antifouling performance of Examples 1-3—liquid absorption—is significantly lower than that of Comparative Example 2, thus preventing the spunbond nonwoven fabric from absorbing exudates from food and ingredients, breeding bacteria, and causing contamination, thereby improving the reusability of the spunbond nonwoven fabric of this application.

[0124] As can be seen from the comparison of Example 1 and Comparative Examples 1-3, both the absorbent inhibitor and the antioxidant are indispensable in the antifouling component of this application. Although the spunbond nonwoven fabrics in Comparative Examples 1 and 2 contain the same antioxidant as those in this application, they do not contain the absorbent inhibitor, so their liquid absorption is significantly higher than that of Example 1, resulting in poor antifouling performance.

[0125] The spunbond nonwoven fabric of Comparative Example 3 contains a desiccant but no antioxidant, and its liquid absorption is significantly higher than that of Example 1. This is because sorbitol and ethyl sorbate in this application can promote the dispersion and stability of the desiccant in the dispersion liquid, which makes it easier for the desiccant to adhere evenly to the filament fibers after spraying, thus obtaining better antifouling performance.

[0126] Comparing Examples 1 and 5-8, it can be seen that when the absorbent is selected from polydimethylsiloxane phosphate or polydimethylsiloxane alcohol stearate, and the antioxidant is ethyl sorbate, the resulting spunbond nonwoven fabric has better and longer-lasting antifouling performance.

[0127] Comparing Examples 1, 10, and 12, it is evident that the ratio of inhibitor content in the antifouling modified liquid increases sequentially from Example 10 to Example 1 to Example 12. The antifouling performance—liquid absorption—decreases with increasing inhibitor content. Specifically, in Examples 1 and 12, further increases in inhibitor content in the antifouling modified liquid do not necessarily improve antifouling performance. Furthermore, as the inhibitor content in the antifouling modified liquid increases, the difficulty of mixing and dispersing the inhibitor also increases, requiring more dispersion and stirring time.

[0128] Comparing Examples 1, 13, and 14, it can be seen that the amount of antifouling modified liquid used per unit weight of filament fiber increases with the order of Examples 13, 1, and 14, and the antifouling performance - liquid absorption decreases accordingly.

[0129] Furthermore, based on Comparative Examples 4 and 5, it can be seen that when the content of the absorbent agent in spunbond nonwoven fabric is too high, the spunbond nonwoven fabric will have a waxy appearance and an oily feel.

[0130] Taking all factors into consideration, the proportion of the antifouling agent in the antifouling modified liquid should not be too high, the amount of antifouling modified liquid and the content of the antifouling agent in the spunbond nonwoven fabric should not be too high, and the content of the antifouling component in the antifouling fiber web is preferably 0.7 to 1.02 wt%.

[0131] As can be seen from Examples 1 and 13-14, the antioxidant in the antifouling component can be 1 to 1.2 parts.

[0132] Comparing Examples 1 and 15, Example 1 exhibits superior stain resistance and long-term stain resistance compared to Example 15. This is because the addition of an adsorbent to the raw material of the filament fibers promotes stable bonding between the stain-resistant components and the surface of the filament fibers, thereby improving the stain resistance and long-term stain resistance of the spunbond nonwoven fabric. Meanwhile, in Comparative Example 6, an adsorbent was added to the raw material of the filament fibers, but no stain-resistant components were present. The adsorbent mixed into the filament fibers without the protection of stain-resistant components actually made the spunbond nonwoven fabric more susceptible to liquid absorption, resulting in a decrease in stain resistance.

[0133] As can be seen from Examples 1 and 16-21, the amount of adsorbent used in this application can be 1.5-4.2% of the mass of the filament fiber, and the adsorbent can also be nano-silica or nano-alumina.

[0134] As can be seen from Example 22, ethanol can also be used as the dispersion in this application.

[0135] As can be seen from Examples 23 and 24, the improved antifouling component adopted in this application can be widely applied to nonwoven fabrics with polypropylene / polyethylene as the fiber matrix.

[0136] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A stain-resistant spunbond nonwoven fabric, characterized in that: It is composed of two or more layers of fiber web bonded together, with the outer fiber web being a stain-resistant fiber web, the fiber surface of which is loaded with a stain-resistant component. The antifouling component comprises the following components in parts by weight: 10-13 parts of an absorbent blocker; the absorbent blocker is polydimethylsiloxane phosphate or polydimethylsiloxane alcohol stearate; 1-1.2 parts of antioxidant; the antioxidant is ethyl sorbate; The antifouling fiber mesh contains 0.82~1.04 wt% of an anti-absorption agent. The antifouling fiber mesh contains 1.5 to 4.2 wt% of adsorbent, which is nano-calcium carbonate.

2. The preparation process of spunbond nonwoven fabric according to claim 1, characterized in that: Includes the following steps: After the polymer is extruded and stretched to form continuous filament fibers, an antifouling modification liquid is sprayed onto the filament fibers to obtain modified fibers. The modified fibers are then laid into a web to obtain an antifouling fiber web. The antifouling modified liquid is obtained by dispersing the antifouling component in a dispersion liquid, and the long filament fiber is insoluble in the dispersion liquid; The dispersion is acetone.

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