Odor-resistant nonwoven fabric, its preparation method and application

Abstract

The present invention relates to the technical field of non-woven fabrics, and in particular to an anti-odor non-woven fabric and a preparation method and application thereof. The present application discloses an anti-odor non-woven fabric, comprising a substrate and a padding finishing liquid coated on the substrate; the padding finishing liquid comprises the following raw materials by weight: 0.5-20% cyclodextrin, 0.2-10% zinc ricinoleate, 0.1-2% cross-linking agent, and the remainder is water. The anti-odor non-woven fabric described in the present application uses the substrate as a carrier, which provides a very large specific surface area for cyclodextrin cross-linked products and zinc ricinoleate, so that the cyclodextrin cross-linked products and zinc ricinoleate can be more fully in contact with odor molecules in media such as air and water, and the deodorization efficiency is higher.

Description

Technical Field

[0001] The invention relates to the technical field of non-woven fabrics, and in particular to an anti-odor non-woven fabric and a preparation method and application thereof. Background Art

[0002] Non-woven fabrics (English name: Non Woven), as a new type of environmentally friendly material, have been widely used in many fields in recent years. Non-woven fabrics are composed of directional or random fibers. They are not only moisture-proof, breathable, flexible, lightweight, non-toxic and non-irritating, colorful, low-priced, and recyclable, but also break through the limitations of traditional textile principles and achieve the characteristics of short process flow, fast production speed, high output, low cost, and diversified raw material sources. There are many ways to produce non-woven fabrics, including stitching, needle punching, spunlace, spunbond, meltblown, hot air spinning, and wet methods. Each method can give non-woven fabrics different properties and characteristics, thereby meeting the needs of various complex application scenarios.

[0003] With the improvement of people's quality of life and the pursuit of a healthy environment, the demand for non-woven materials that can effectively remove odors in the air, especially the odor of gaseous organic matter, is becoming increasingly urgent. However, although existing non-woven fabrics can filter particulate matter in the air to a certain extent, their ability to absorb and remove gaseous organic odors is relatively limited. At present, some non-woven fabric products on the market try to improve their anti-odor performance by adding some chemical adsorbents or physical adsorbents, but these methods often have the following problems:

[0004] 1. Low adsorption efficiency

[0005] A single physical adsorption or chemical adsorption mechanism is often difficult to achieve efficient removal of odor molecules, especially for complex gaseous organic odors, the removal effect is even more limited.

[0006] 2. Poor load stability

[0007] Many adsorbents have insufficient loading stability on the surface of non-woven fabrics and are easily precipitated or fallen off during use, resulting in a rapid decrease in anti-odor performance.

[0008] 3. Poor water resistance

[0009] When some non-woven products come into contact with water, the anti-odor ingredients adsorbed on the surface of them are easily dissolved and lost, thus affecting their long-term use effect.

[0010] To this end, the present application provides an anti-odor non-woven fabric and a preparation method and application thereof. Summary of the invention

[0011] In view of the technical problems of low adsorption efficiency, poor load stability and poor water resistance of current non-woven fabrics, the present application provides an anti-odor non-woven fabric and a preparation method and application thereof. The anti-odor non-woven fabric uses a substrate as a carrier, which provides a very large specific surface area for cyclodextrin cross-linked products and zinc ricinoleate, so that the cyclodextrin cross-linked products and zinc ricinoleate can be more fully in contact with odor molecules in media such as air and water, thereby achieving higher odor removal efficiency.

[0012] The technical solution adopted by this application to solve its technical problem is:

[0013] In a first aspect, the present application provides an anti-odor nonwoven fabric, comprising a substrate and a padding finishing liquid coated on the substrate; the padding finishing liquid comprises the following raw materials in weight content:

[0014] Cyclodextrin 0.5-20%, zinc ricinoleate 0.2-10%, cross-linking agent 0.1-2%, and the balance is water.

[0015] In some specific embodiments, the substrate is selected from one or more of spunbond nonwoven fabrics, meltblown fabrics, spunlace nonwoven fabrics, needle-punched nonwoven fabrics, chemically bonded nonwoven fabrics, ES nonwoven fabrics, and staple fiber wet-laid nonwoven fabrics.

[0016] In some specific embodiments, the cyclodextrin is selected from one or more of α-cyclodextrin, β-cyclodextrin, γ-cyclodextrin, methyl cyclodextrin, hydroxypropyl cyclodextrin, and acetyl cyclodextrin.

[0017] In some specific embodiments, the cross-linking agent is selected from one or more of citric acid, pyromellitic anhydride, carbonyl diimidazole, diphenyl carbonate, blocked diisocyanate, and epichlorohydrin.

[0018] In a second aspect, the present application provides a method for preparing an odor-proof nonwoven fabric, comprising the following steps:

[0019] S1. Preparation of padding finishing solution

[0020] S2. Padding treatment

[0021] Performing padding treatment on the substrate so that the substrate is coated with the padding finishing liquid to obtain a substrate with the padding finishing liquid;

[0022] S3. Drying

[0023] The substrate with the padding finishing liquid is dried to obtain an anti-odor nonwoven fabric.

[0024] In some specific embodiments, in step S2, during the padding treatment, the pressure of the roller is 0.2-0.4 MPa and the padding speed is 2-10 m / min.

[0025] In some specific embodiments, in step S2, the liquid content of the substrate with the padding finishing liquid is 60-150%.

[0026] In some specific embodiments, in step S3, the temperature of the drying process is 80-170°C.

[0027] On the third aspect, the present application provides an application of an anti-odor non-woven fabric, and the anti-odor non-woven fabric is used to prepare masks, diapers, sanitary napkins, pet mats, bed sheets, quilt covers, pillowcases, curtains, tablecloths, and carpets.

[0028] In some specific embodiments, the mask includes a surface layer, a filter layer disposed under the surface layer, and a skin-contacting layer disposed under the filter layer; the surface layer is made of odor-proof non-woven fabric.

[0029] The beneficial effects of this application are:

[0030] (1) The anti-odor nonwoven fabric of the present application uses the substrate as a carrier to provide a very large specific surface area for the cyclodextrin cross-linked product and zinc ricinoleate, so that the cyclodextrin cross-linked product and zinc ricinoleate can be more fully in contact with odor molecules in media such as air and water, thereby achieving a higher odor removal efficiency.

[0031] (2) The anti-odor nonwoven fabric of the present application, the cyclodextrin molecular cavity structure and the cross-linked structure can form an inclusion complex with zinc ricinoleate, and zinc ricinoleate partially or completely enters the cyclodextrin molecular cavity structure, thereby improving the stability of zinc ricinoleate loading on the substrate fiber and preventing it from precipitating or falling off.

[0032] (3) The anti-odor nonwoven fabric of the present application, the cyclodextrin and zinc ricinoleate in the padding finishing have a synergistic effect of removing odors, which is manifested in that the cyclodextrin as a physical adsorbent can quickly adsorb odor molecules, and the zinc ricinoleate can react with the odor molecules adsorbed / desorbed by the cyclodextrin to undergo a chemical complexation reaction to permanently fix the odor molecules and convert them into non-volatile odor-free complexes; the anti-odor nonwoven fabric absorbs odors more thoroughly than pure physical adsorption, and absorbs odors more quickly than pure chemical adsorption. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0034] Figure 1 This is a process flow chart of a method for preparing an odor-proof non-woven fabric described in this application. DETAILED DESCRIPTION

[0035] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments, and the contents mentioned in the implementation modes are not intended to limit the present invention.

[0036] As used herein, "and / or" includes the term of any and all combinations of one or more associated listed items. The terms used herein are only used to describe specific embodiments and are not intended to limit the present invention. As used herein, the singular forms "a", "an", "an" and "the" are also intended to include the plural forms, unless the context clearly indicates otherwise. It is further understood that "including", when used in this specification, specifies the stated features, integers, steps, operations, elements and / or compositions, but does not exclude the existence or addition of one or more other features, integers, steps, operations, elements, compositions and / or combinations thereof.

[0037] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the invention belongs. It is further understood that terms, such as defined in commonly used dictionaries, are interpreted in accordance with their meanings in the context of the relevant art and are not in an idealized or overly formal sense unless explicitly so defined herein.

[0038] The exemplary invention described herein may appropriately lack any one or more element limitations that are not specifically disclosed herein. Therefore, the terms "comprise", "include", "contain", etc. should be understood broadly and non-restrictively. In addition, the terminology used herein is used as a description, not a limitation, and it is unintentional to use these terminology expressions that do not include any equivalent characteristics, but only describe some of their characteristics, but various modifications are possible within the scope of the present invention according to the rights. Therefore, although the present invention has been specifically disclosed by preferred embodiments and optional features, the modifications disclosed herein to embody the changes of the present invention may be recorded by those skilled in the art, and such modifications and changes will be considered to be within the scope of the present invention.

[0039] In view of the technical problems that the existing non-woven fabrics can filter particulate matter in the air but have no effective absorption and removal function for gaseous organic odor, as well as poor load stability and water resistance, the present application provides an anti-odor non-woven fabric, including a substrate and a padding finishing liquid coated on the substrate; the padding finishing liquid includes the following raw materials by weight:

[0040] Cyclodextrin 0.5-20%, zinc ricinoleate 0.2-10%, cross-linking agent 0.1-2%, and the balance is water.

[0041] In some embodiments, the substrate is selected from one or more of spunbond nonwoven fabrics, meltblown fabrics, spunlace nonwoven fabrics, needle-punched nonwoven fabrics, chemically bonded nonwoven fabrics, ES nonwoven fabrics, and staple fiber wet-laid nonwoven fabrics.

[0042] Specifically, the substrate is selected from spunbond nonwoven fabrics, meltblown fabrics, spunlace nonwoven fabrics, needle-punched nonwoven fabrics, chemically bonded nonwoven fabrics, ES nonwoven fabrics, staple fiber wet-laid nonwoven fabrics and other types, aiming to provide diverse choices to adapt to different application scenarios and performance requirements.

[0043] In some embodiments, the cyclodextrin is selected from one or more of α-cyclodextrin, β-cyclodextrin, γ-cyclodextrin, methylcyclodextrin, hydroxypropylcyclodextrin, and acetylcyclodextrin.

[0044] Specifically, cyclodextrin (CD) is a type of cyclic oligosaccharide formed by connecting D-pyranose glucose units end to end through α-1,4-glycosidic bonds. They have a cyclic hollow cylindrical three-dimensional structure, with hydrophilic outer edges and hydrophobic inner cavities, which enables cyclodextrin to selectively include a variety of hydrophobic molecules. In the present application, cyclodextrin is selected from one or more of α-cyclodextrin, β-cyclodextrin, γ-cyclodextrin, methylcyclodextrin, hydroxypropylcyclodextrin, and acetylcyclodextrin, with the purpose of utilizing its unique inclusion characteristics to adsorb and fix molecules with odor, thereby improving the anti-odor performance of non-woven fabrics. The addition of cyclodextrin can also enhance the stability and durability of non-woven fabrics during long-term use, ensuring the durability of anti-odor performance. The weight content of cyclodextrin in the padding finishing solution can be any value of 0.5%, 1%, 5%, 10%, and 20%, as long as it meets the requirements of 0.5-20% (including the endpoint value).

[0045] In some embodiments, the crosslinking agent is selected from one or more of citric acid, pyromellitic anhydride, carbonyl diimidazole, diphenyl carbonate, blocked diisocyanate, and epichlorohydrin.

[0046] In the present application, the crosslinking agent can form stable crosslinking points between fibers through chemical or physical action, thereby significantly enhancing the bonding force between fibers, making the non-woven fabric tighter and stronger. The crosslinking agent can form stable crosslinking points between fibers through chemical or physical action, thereby significantly enhancing the bonding force between fibers, making the non-woven fabric tighter and stronger. Through the action of the crosslinking agent, anti-odor ingredients such as cyclodextrin can be more firmly fixed on the non-woven fabric, and are not easy to fall off or lose, thereby improving the anti-odor effect of the non-woven fabric. The weight content of the crosslinking agent in the padding finishing liquid can be any value of 0.1%, 0.5%, 1.5%, and 2%, as long as it meets the requirement of 0.1-2% (including the endpoint value).

[0047] In some embodiments, the weight content of zinc ricinoleate in the padding finishing solution can be any value among 0.2%, 0.5%, 1.5%, 2%, and 10%, as long as it meets the requirement of 0.2-10% (including the endpoint values).

[0048] Specifically, the padding finishing liquid contains zinc ricinoleate. As a chemical adsorbent, zinc ricinoleate can react chemically with odor molecules (such as ammonia, etc.) adsorbed by cyclodextrin to permanently fix the odor molecules and convert them into non-volatile odor-free complexes. This chemical adsorption is more thorough than simple physical adsorption and can effectively reduce the re-release of odor molecules.

[0049] Moreover, zinc ricinoleate forms an inclusion complex with cyclodextrin, partially or completely entering the molecular cavity structure of cyclodextrin. This structure not only improves the loading stability of zinc ricinoleate on non-woven fabric fibers, but also enhances its synergistic effect with cyclodextrin; cyclodextrin acts as a physical adsorbent to quickly adsorb odor molecules, while zinc ricinoleate further reacts chemically with these odor molecules, thereby significantly improving the deodorization efficiency.

[0050] Therefore, in the present application, the synergistic effect of zinc ricinoleate and cyclodextrin not only improves the deodorization efficiency, but also ensures the durability and stability of the anti-odor non-woven fabric; especially in a humid environment, the cross-linked cyclodextrin is wrapped on the non-woven fabric fibers and is no longer soluble in water, thus avoiding the loss of active ingredients such as zinc ricinoleate.

[0051] In summary, in the application, the anti-odor non-woven fabric includes a substrate and a padding finishing liquid coated on the substrate. The key ingredients in the padding finishing liquid (zinc ricinoleate, cyclodextrin, cross-linking agent) can give the non-woven fabric an anti-odor function. Compared with pure physical adsorption, the odor is adsorbed more thoroughly, and compared with pure chemical adsorption, the odor is adsorbed faster.

[0052] like Figure 1 As shown, the present application also provides a method for preparing an odor-proof nonwoven fabric, comprising the following steps:

[0053] S1. Preparation of padding finishing solution

[0054] S2. Padding treatment

[0055] Performing padding treatment on the substrate so that the substrate is coated with the padding finishing liquid to obtain a substrate with the padding finishing liquid;

[0056] S3. Drying

[0057] The substrate with the padding finishing liquid is dried to obtain an anti-odor nonwoven fabric.

[0058] In some embodiments, in step S2, the pressure of the roller during the padding treatment is 0.2-0.4 MPa and the padding speed is 2-10 m / min.

[0059] Specifically, the pressure of the roller directly affects the contact tightness between the nonwoven fabric and the padding finishing liquid. The greater the pressure, the tighter the contact between the nonwoven fabric and the finishing liquid, but too much pressure may cause the nonwoven fabric to deform or damage; if the pressure is too small, the contact between the nonwoven fabric and the finishing liquid is insufficient, and the liquid pick-up rate is reduced. Therefore, setting it within the range of 0.2-0.4MPa can ensure sufficient contact and avoid damage.

[0060] Specifically, the padding speed determines the length of time the nonwoven fabric passes through the padding machine. If the speed is too fast, the contact time between the nonwoven fabric and the finishing liquid is shortened, and the liquid pick-up rate may be insufficient; if the speed is too slow, although the contact time can be increased, the production efficiency will be reduced. Therefore, it is set within the range of 2-10m / min, and can be adjusted according to specific production needs to achieve a better liquid pick-up rate and production efficiency. Therefore, by setting a reasonable roller pressure and padding speed, it can be ensured that the nonwoven fabric absorbs the finishing liquid evenly during the padding process, avoiding the problem of excessive or insufficient local adsorption, thereby improving the overall anti-odor performance of the nonwoven fabric.

[0061] In some embodiments, in step S2, the liquid content of the substrate with the padding finishing liquid is 60-150%.

[0062] Specifically, the present application can control the degree of cross-linking between cyclodextrin and the cross-linking agent in the subsequent drying process and the final physical and chemical properties of the non-woven fabric by adjusting the liquid carrying rate (i.e., the weight of the padding finishing liquid on the substrate with the padding finishing liquid is 60-150% of the weight of the substrate with the padding finishing liquid). Setting the liquid carrying rate range to 60%-150% can ensure that the non-woven fabric can fully absorb the padding finishing liquid during the padding process and can easily remove excess water during the subsequent drying process, thereby obtaining an anti-odor non-woven fabric with stable performance.

[0063] In some embodiments, in step S3, the temperature of the drying process is 80-170°C.

[0064] Specifically, in the selected temperature range of 80-170°C, the crosslinking agent (such as citric acid, pyromellitic anhydride, etc.) reacts chemically with the hydroxyl groups on the cyclodextrin to form a stable crosslinking structure. The crosslinking structure tightly coats the cyclodextrin and zinc ricinoleate on the non-woven fabric fibers, improving the anti-odor performance and water resistance of the non-woven fabric; and the drying process can also effectively remove moisture from the non-woven fabric, ensuring the stability of the cyclodextrin crosslink and zinc ricinoleate on the fiber surface, avoiding dissolution and loss due to moisture during use.

[0065] Therefore, through the drying process, the cyclodextrin and the cross-linking agent form a stable cross-linking structure, ensuring the effective load and stability of zinc ricinoleate on the fiber, thereby improving the non-woven fabric's ability to absorb and remove gaseous organic odors. The cross-linked cyclodextrin is no longer soluble in water, avoiding the problem of component loss due to contact with water during use, extending the service life of the non-woven fabric and the anti-odor effect. Reasonable drying temperature setting can not only ensure the occurrence of cross-linking reaction, but also avoid damage to the non-woven fabric, ensuring the overall performance and quality of the non-woven fabric.

[0066] The present application also provides an application of an anti-odor non-woven fabric, which is used to prepare masks, diapers, sanitary napkins, pet mats, bed sheets, quilt covers, pillowcases, curtains, tablecloths, and carpets.

[0067] For example, the mask includes a surface layer, a filter layer arranged under the surface layer, and a skin-contacting layer arranged under the filter layer. The surface layer is the above-mentioned anti-odor non-woven fabric.

[0068] The anti-odor nonwoven fabric described in the present application is further described through the following examples and comparative examples;

[0069] Example 1

[0070] A method for preparing an odor-proof nonwoven fabric comprises the following steps:

[0071] S1. Preparation of padding finishing solution

[0072] Hydroxypropyl β-cyclodextrin, zinc ricinoleate, citric acid and deionized water were prepared into a padding finishing solution at mass fractions of 5%, 5%, 0.5% and 89.5%.

[0073] S2. Padding treatment

[0074] The padding finishing liquid was added into the liquid tank of the post-finishing padding machine, the pressure of the pressure roller was set to 0.25 MPa, the padding speed was set to 2.5 / min, and 50gsm pure cotton spunlace nonwoven fabric was used for padding finishing, and the liquid carrying rate of the spunlace nonwoven fabric was 100%.

[0075] S3. Drying

[0076] Subsequently, the spunlace nonwoven fabric with the padding finishing liquid was placed in a 140°C oven and dried for 3 minutes to remove moisture, and hydroxypropyl β-cyclodextrin and the crosslinking agent citric acid were dehydrated, esterified and crosslinked at high temperature to form a film to obtain an anti-odor pure cotton spunlace nonwoven fabric.

[0077] Example 2

[0078] A method for preparing an odor-proof nonwoven fabric comprises the following steps:

[0079] S1. Preparation of padding finishing solution

[0080] α-cyclodextrin, zinc ricinoleate, blocked isocyanate and deionized water were prepared into padding finishing liquid according to mass fractions of 5%, 5%, 0.5% and 89.5%.

[0081] S2. Padding treatment

[0082] The padding finishing liquid was added into the liquid tank of the post-finishing padding machine, the pressure of the roller was set to 0.3 MPa, the padding speed was set to 3 / min, and 50 gsm polypropylene spunbond nonwoven fabric was used for padding finishing, and the liquid carrying rate of the spunbond nonwoven fabric was 80%.

[0083] S3. Drying

[0084] Subsequently, the spunbond nonwoven fabric with the padding finishing liquid was placed in a 120°C oven and baked for 4 minutes to remove moisture, and the blocked isocyanate was unblocked at high temperature to release the active isocyanate group, and α-cyclodextrin and isocyanate were cross-linked to form a film to obtain an anti-odor polypropylene spunbond nonwoven fabric.

[0085] Example 3

[0086] A method for preparing an odor-proof nonwoven fabric comprises the following steps:

[0087] S1. Preparation of padding finishing solution

[0088] The padding finishing liquid is prepared by mixing γ-cyclodextrin, zinc ricinoleate, pyromellitic anhydride and deionized water in the mass fractions of 5%, 5%, 0.5% and 89.5%.

[0089] S2. Padding treatment

[0090] The padding finishing liquid was added into the liquid tank of the post-finishing padding machine, the pressure of the pressure roller was set to 0.4 MPa, the padding speed was set to 4 / min, and 50gsm polyester spunbond nonwoven fabric was used for padding finishing, and the liquid carrying rate of the spunbond nonwoven fabric was 80%.

[0091] S3. Drying

[0092] Subsequently, the spunbond nonwoven fabric with the padding finishing solution was placed in an oven at 160° C. and dried for 3 minutes to remove moisture, and the cyclodextrin and the cross-linking agent pyromellitic anhydride were dehydrated, esterified, and cross-linked at high temperature to form a film, thereby obtaining an anti-odor polyester spunbond nonwoven fabric.

[0093] Comparative Example 1

[0094] A method for preparing a nonwoven fabric comprises the following steps:

[0095] In step S1, hydroxypropyl β-cyclodextrin, zinc ricinoleate and deionized water are prepared into a padding finishing solution at mass fractions of 5%, 5% and 90%, and the other preparation steps are the same as those of Example 1. The difference from Example 1 is that no crosslinking agent is contained.

[0096] Comparative Example 2

[0097] A method for preparing a nonwoven fabric comprises the following steps:

[0098] In step S1, hydroxypropyl β-cyclodextrin, citric acid and deionized water are prepared into a padding finishing solution at mass fractions of 10%, 0.5% and 89.5%, and the other preparation steps are the same as those in Example 1. The difference from Example 1 is that only hydroxypropyl β-cyclodextrin physical adsorbent is used to modify the pure cotton spunlace fabric.

[0099] Comparative Example 3

[0100] A method for preparing a nonwoven fabric comprises the following steps:

[0101] In step S1, hydroxypropyl zinc ricinoleate and deionized water are prepared into a padding finishing solution at mass fractions of 10% and 90%, and the other preparation steps are the same as those of Example 1. The difference from Example 1 is that only the chemical adsorbent zinc ricinoleate is used to modify the pure cotton spunlace fabric.

[0102] Water resistance test and evaluation:

[0103] Take 5 g of the anti-odor non-woven fabrics prepared in Example 1 and Comparative Example 1, respectively, put them into 200 ml glass beakers, then add 100 ml of deionized water, soak them at room temperature 25°C for 30 min, then take them out and put them into an oven at 80°C for drying for 30 min, and finally weigh them respectively to calculate the weight loss rate.

[0104] Table 1 Water resistance test data

[0105] sample Original weight (g) Dry weight after soaking in water (g) Weight loss rate (%) Example 1 5.0 4.995 0.1％ Comparative Example 1 5.0 4.623 7.54％

[0106] From the test data in Table 1 above, it can be seen that the weight loss rate of the non-woven fabric sample in Example 1 with the addition of the cross-linking agent after being soaked in water and then dried is only 0.1%, which is almost no weight loss; the weight loss rate of the non-woven fabric sample in Comparative Example 1 after being soaked in water and then dried is as high as 7.54%. It can be seen that the addition of the cross-linking agent significantly improves the water resistance of the anti-odor non-woven fabric.

[0107] Anti-odor effect test and evaluation:

[0108] Test method: Take a 1L glass beaker, add 10g of odor-proof non-woven fabric weighed in advance, add 1g of 0.5%wt ammonia diluent, and quickly seal the beaker mouth with plastic wrap, let it stand at room temperature 25℃ for 10 minutes, and then immediately test the ammonia concentration in the beaker. Take the ammonia concentration of the blank test group without non-woven fabric as a reference, and calculate the ammonia removal rate of each experimental group: Removal rate = 1-ammonia concentration of the experimental group / ammonia concentration of the blank group.

[0109] Table 2 Anti-odor test data

[0110]

[0111]

[0112] From the test data in Table 2 above, we can see that

[0113] 1) The removal rate of ammonia by the unmodified nonwoven fabric is very low. The removal rate of ammonia by the pure cotton spunlace fabric in Example 1 is slightly higher than that by the chemical fiber nonwoven fabrics in Examples 2 and 3 because the cotton fiber itself contains more hydroxyl structures, but both are within 10%;

[0114] 2) The ammonia removal rate of the anti-odor non-woven fabric in each embodiment is significantly improved compared with the corresponding untreated non-woven fabric, indicating that the method has a good anti-odor and odor adsorption effect on various non-woven fabrics;

[0115] 3) By comparing Example 1 with Comparative Example 1, the ammonia removal rates are similar, indicating that the cross-linking agent has little effect on the ammonia removal rate in this experiment. However, since Comparative Example 1 has poor water resistance, it is best to add a cross-linking agent in practical applications.

[0116] By comparing Example 1 with Comparative Examples 2 and 3, it can be found that Example 1 uses cyclodextrin and zinc ricinoleate at the same time, and its ammonia removal rate is significantly higher than that of Comparative Example 2 using cyclodextrin alone and Comparative Example 3 using zinc ricinoleate alone, indicating that cyclodextrin and zinc ricinoleate play a synergistic role in adsorbing ammonia.

[0117] The raw materials or reagents used in the examples and comparative examples of the present invention are all purchased from mainstream manufacturers in the market. Those without indicating the manufacturer or concentration are all analytically pure raw materials or reagents that can be routinely obtained. As long as they can play the expected role, there is no special limitation.

[0118] The instruments and equipment used in this embodiment are all purchased from major manufacturers in the market, and there is no particular limitation as long as they can play the expected role. In this embodiment, if no specific technology or conditions are specified, the technology or conditions described in the literature in this field or the product instructions are used. The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present invention is within the protection scope of the present invention.

Claims

1. An anti-odor nonwoven fabric, characterized in that: It comprises a substrate and a padding finishing liquid coated on the substrate; the padding finishing liquid comprises the following raw materials in weight content: Cyclodextrin 0.5-20%, zinc ricinoleate 0.2-10%, cross-linking agent 0.1-2%, and the balance is water.

2. The anti-odor nonwoven fabric according to claim 1, characterized in that: The substrate is selected from one or more of spunbond nonwoven fabric, meltblown fabric, spunlace nonwoven fabric, needle-punched nonwoven fabric, chemically bonded nonwoven fabric, ES nonwoven fabric, and staple wet-laid nonwoven fabric.

3. The anti-odor nonwoven fabric according to claim 1, characterized in that: The cyclodextrin is selected from one or more of α-cyclodextrin, β-cyclodextrin, γ-cyclodextrin, methyl cyclodextrin, hydroxypropyl cyclodextrin and acetyl cyclodextrin.

4. The anti-odor nonwoven fabric according to claim 1, characterized in that: The crosslinking agent is selected from one or more of citric acid, pyromellitic anhydride, carbonyl diimidazole, diphenyl carbonate, blocked diisocyanate, and epichlorohydrin.

5. The method for preparing the anti-odor nonwoven fabric according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. Preparation of padding finishing solution S2. Padding treatment Performing padding treatment on the substrate so that the substrate is coated with the padding finishing liquid to obtain a substrate with the padding finishing liquid; S3. Drying The substrate with the padding finishing liquid is dried to obtain an anti-odor nonwoven fabric.

6. The preparation method according to claim 5, characterized in that: In step S2, during the padding treatment, the pressure of the roller is 0.2-0.4 MPa and the padding speed is 2-10 m / min.

7. The preparation method according to claim 5, characterized in that: In step S2, the liquid content of the substrate with the padding finishing liquid is 60-150%.

8. The preparation method according to claim 5, characterized in that: In step S3, the temperature of the drying process is 80-170°C.

9. An application of an anti-odor nonwoven fabric, characterized in that: The anti-odor non-woven fabric described in any one of claims 1 to 4 or the anti-odor non-woven fabric prepared by the preparation method described in any one of claims 5 to 8 is used to prepare masks, diapers, sanitary napkins, pet mats, bed sheets, quilt covers, pillowcases, curtains, tablecloths, and carpets.

10. The use according to claim 9, characterized in that: The mask comprises a surface layer, a filter layer arranged under the surface layer, and a skin-contacting layer arranged under the filter layer; the surface layer is made of odor-proof non-woven fabric.

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