Method for manufacturing all-cotton cream nonwoven fabric and all-cotton cream nonwoven fabric

Abstract

This invention relates to the technical field of spunlace nonwoven fabrics, specifically to a method for preparing all-cotton cream nonwoven fabric and the all-cotton cream nonwoven fabric itself. The method for preparing all-cotton cream nonwoven fabric disclosed in this application includes the following steps: (1) Base fabric preparation: using cotton fiber as the base fabric fiber raw material, the fiber raw material is cleaned, combed, laid, spunlaced, and dried to obtain the base fabric; (2) Cream preparation: according to the following weight parts, water 1-4 parts, polyol 5-8 parts, preservative 0.05-0.2 parts, softener 0.5-3 parts, (2) Weigh 0.1-0.5 parts of the raw materials with organic solvent and mix them evenly to obtain a cream; (3) Atomization spraying: Spray the cream obtained in step (2) onto the base fabric obtained in step (1) by ultrasonic atomization or high-pressure airflow atomization; (4) Static curing: Place the nonwoven fabric obtained in step (3) in an environment with a temperature of 15-25℃ and a humidity of 60-80% for curing for 12-24 hours to obtain a cotton cream nonwoven fabric; the moisture content of the cotton cream nonwoven fabric is 10-20%. The cotton cream nonwoven fabric of the present invention has good softness.

Description

Technical Field

[0001] This invention relates to the field of spunlace nonwoven fabric technology, specifically to a method for preparing all-cotton cream nonwoven fabric and the all-cotton cream nonwoven fabric itself. Background Technology

[0002] Traditional soft nonwoven fabrics are typically made by using a cream formulated with water, polyols, preservatives, and silicone-containing softeners (such as hexamethylcyclotrisiloxane D3, octamethylcyclotetrasiloxane D4, decamethylcyclopentasiloxane D5, and dodecylcyclohexasiloxane D6), followed by hydroentangling, padding, and drying. To improve softness, the amount of silicone-containing softener is often increased. However, while this method improves softness, it significantly reduces the abrasion resistance, water absorption, and tensile strength of the nonwoven fabric.

[0003] On the other hand, the traditional hydroentanglement followed by padding and drying process applies pressure to the nonwoven fabric during padding, which greatly reduces the thickness of the originally fluffy and high liquid content fabric. Furthermore, during the drying process, the effective ingredients of the cream attached to the fibers are lost along with the moisture, further weakening the softness and thickness of the product.

[0004] In view of this, the purpose of the present invention is to provide a new technical solution to solve the existing technical problems. Summary of the Invention

[0005] This application discloses a method for preparing all-cotton cream nonwoven fabric and the all-cotton cream nonwoven fabric. The method for preparing all-cotton cream nonwoven fabric optimizes the composition of the cream raw materials and applies the cream to the nonwoven fabric by spraying, combined with static curing treatment, to effectively ensure the softness of the all-cotton spunlace nonwoven fabric.

[0006] The objective of this invention is achieved through the following technical solution: The primary objective of this application is to provide a method for preparing a pure cotton cream nonwoven fabric, comprising the following steps: (1) Base fabric preparation: The fiber raw material of cotton fiber is obtained by cleaning, combing, web laying, hydroentangling and drying the fiber raw material; (2) Cream preparation: Weigh and mix the raw materials according to the following weight parts: water 1-4 parts, polyol 5-8 parts, preservative 0.05-0.2 parts, softener 0.5-3 parts, organic solvent 0.1-0.5 parts, stir evenly to obtain cream; (3) Atomized spraying: The cream obtained in step (2) is sprayed onto the base fabric obtained in step (1) by ultrasonic atomization or high-pressure airflow atomization. (4) Standing and curing: The non-woven fabric obtained in step (3) is placed in an environment with a temperature of 15-25℃ and a humidity of 60-80% for curing for 12-24 hours to obtain all-cotton cream non-woven fabric. The moisture content of the cotton cream nonwoven fabric is 10-20%.

[0007] In some specific embodiments, the polyol is one or more of glycerol, 1,2-propanediol, 1,3-propanediol, 1,3-butanediol, 1,2-pentanediol, 1,2-hexanediol, dipropylene glycol, polyethylene glycol-8, polyethylene glycol-400, polyethylene glycol-600, sorbitol, xylitol, and erythritol.

[0008] In some specific embodiments, the preservative is one or more of phenoxyethanol, ethylhexylglycerin, chlorphenesin, p-hydroxyacetophenone, sodium benzoate, benzalkonium chloride, and cetylpyridinium chloride.

[0009] In some specific embodiments, the softener is one or more of cetirizine chloride, dipalmitoyl ethyl hydroxyethyl methyl ammonium sulfate, methyl sulfonate of esterified unsaturated fatty acids, methyl ester salt of unsaturated fatty acid-2-hydroxy-N, N-bis(2-hydroxyethyl)-N-methylacetyl ammonium sulfate, fatty acid ester of dihydroxyethyl dimethyl ammonium chloride, polyquaternium-7, and cetearyl alcohol.

[0010] In some specific embodiments, the organic solvent is one or more of ethanol, isopropanol, and n-propanol.

[0011] In some specific embodiments, step (4) specifically includes: covering the nonwoven fabric obtained in step (3) with a PE film, and then placing it in an environment with a temperature of 15-25℃ and a humidity of 60-80% for aging, with a standing time of 12-24h.

[0012] In some specific embodiments, in step (3), the spraying distance is 10-25 cm, the spraying particle size is 10-50 μm, and the spraying amount is 3-8 mL / cm. 2 .

[0013] In some specific embodiments, the cream has a viscosity ≤50 mPa·s, a whiteness ≥80, and a pH of 4-8.

[0014] In some specific embodiments, in step (1), the drying temperature is 100-140℃, the drying speed is 50-80m / min, the drying time is 5-20s, and the moisture regain of the base fabric is 4-8%.

[0015] The second objective of this application is to provide a cotton cream nonwoven fabric prepared by the method described above.

[0016] The beneficial effects of this invention are: The method for preparing the all-cotton cream nonwoven fabric described in this application optimizes the cream formula and applies the cream to the base fabric surface using an aerosol spraying method, ensuring that the cream is evenly distributed on the base fabric surface. The method of first drying the spunlace nonwoven fabric and then spraying the cream onto the base fabric surface effectively avoids the possibility of the effective ingredients of the cream evaporating during drying. Furthermore, the nonwoven fabric with the cream sprayed is allowed to stand and mature, allowing the cream to penetrate into the interior of the nonwoven fabric and ensuring the uniformity of the overall hand feel.

[0017] The all-cotton cream nonwoven fabric described in this application has good softness, strength, and water absorption, while effectively retaining fabric thickness and exhibiting strong abrasion resistance. The all-cotton cream nonwoven fabric prepared using the method of this invention has a softness of 350-500 mN in the MD direction, a softness of 100-150 mN in the CD direction, a water absorption of 500-600%, a strength of 50-60 N in the MD direction, a strength of 25-40 N in the CD direction, a thickness of 0.35 mm-0.50 mm, and an abrasion resistance ≥ level 3. Detailed Implementation

[0018] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments. The content mentioned in the embodiments is not intended to limit the present invention.

[0019] As used herein, “and / or” includes all combinations of any and one or more of the associated listed items. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the 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. Further understanding is needed; when used in this specification, “comprising” designates the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or combinations thereof.

[0020] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Further understanding is that terms, such as those defined in common dictionaries, are interpreted in accordance with their meaning in the context of the relevant field and are not idealized or overly formal, unless expressly defined herein.

[0021] The exemplary invention described herein may suitably omit any one or more limiting elements, which are not specifically disclosed herein. Therefore, terms such as “comprising,” “including,” “containing,” etc., should be interpreted broadly and non-limitingly. Furthermore, the terminology used herein is for descriptive purposes without limitation, and it is unintentional to use terms that do not include any equivalent characteristics, but only to describe a portion of their characteristics; however, various modifications are possible within the scope of the invention according to the claims. Therefore, while the invention has been specifically disclosed through preferred embodiments and optional features, variations of the invention embodied by the modifications disclosed herein may be noted by those skilled in the art, and such modifications and variations are considered to be within the scope of the invention.

[0022] All raw materials or reagents used in the embodiments and comparative examples of this invention were purchased from mainstream manufacturers on the market. Those without specified manufacturers or concentrations are all analytical grade raw materials or reagents that are routinely available. There are no particular restrictions as long as they achieve the expected effect. The instruments and equipment used in this embodiment were all purchased from major manufacturers on the market. There are no particular limitations as long as they achieve the expected effect. Where specific techniques or conditions are not specified in this embodiment, they shall be performed in accordance with the techniques or conditions described in the literature in this field or according to the product instructions.

[0023] Existing technologies often use water, polyols, preservatives, and silicone-containing softeners (such as D3-D6 cyclic siloxanes) to formulate a cream, which is then hydroentangled, padded, and dried to obtain a soft nonwoven fabric. To improve softness, the amount of silicone-containing softener is usually increased, but this leads to a significant decrease in abrasion resistance, water absorption, and tensile strength, making it difficult to achieve a comprehensive balance of softness, abrasion resistance, water absorption, strength, and thickness. Furthermore, in the traditional hydroentanglement followed by padding and drying process, padding and extrusion significantly reduce the thickness of the fluffy nonwoven fabric, and during the subsequent drying process, the cream evaporates along with the water, resulting in the loss of effective ingredients and further weakening the product's softness and thickness. In view of this, the present invention provides a method for preparing a pure cotton cream nonwoven fabric. By optimizing the cream formulation and production process, a pure cotton cream nonwoven fabric with stable softness, abrasion resistance, water absorption, strength, and thickness, and a uniform hand feel is obtained. The method for preparing the pure cotton cream nonwoven fabric of the present invention includes the following steps: (1) Base fabric preparation: The fiber raw material of cotton fiber is obtained by cleaning, combing, web laying, hydroentangling and drying the fiber raw material; Specifically, the hydroentangled nonwoven fabric is dried at low temperature and slowly using either hot air penetration drying or drum drying. Low-temperature, slow drying effectively prevents the fibers from hardening due to rapid temperature increases, which would otherwise cause the base fabric to stiffen.

[0024] (2) Cream preparation: Weigh and mix the raw materials according to the following weight parts: water 1-4 parts, polyol 5-8 parts, preservative 0.05-0.2 parts, softener 0.5-3 parts, organic solvent 0.1-0.5 parts, stir evenly; The resulting cream has a viscosity ≤50 mPa·s, whiteness ≥80, and pH 4-8.

[0025] (3) Atomized spraying: The cream obtained in step (2) is sprayed onto the base fabric obtained in step (1) by ultrasonic atomization or high-pressure airflow atomization. The spraying distance is 10-25cm, the spraying particle size is 10-50μm, and the spraying amount is 3-8mL / cm. 2 .

[0026] (4) Standing and curing: The non-woven fabric obtained in step (3) is placed in an environment of 15-25℃ and 60-80% humidity for 12-24 hours to obtain all-cotton cream non-woven fabric. The moisture content of all-cotton cream nonwoven fabric is 10-20%.

[0027] This invention involves first drying the hydroentangled nonwoven fabric, then spraying a cream onto the base fabric using an aerosol spraying method. This not only preserves the original thickness of the nonwoven fabric but also allows for adjustment of the cream content on the base fabric by controlling the spraying amount, thereby regulating the hand feel of the nonwoven fabric. Furthermore, a static curing process ensures that the cream is evenly distributed on the surface of the base fabric and penetrates into its interior, resulting in a final all-cotton cream-coated nonwoven fabric with excellent softness, abrasion resistance, water absorption, and strength.

[0028] In some specific implementations, the base fabric is prepared by the following steps: Step S1, cotton cleaning, involves opening, removing impurities, and mixing the cotton fibers; Step S2, combing, straightening the cotton fibers after cleaning; Step S3, combing, is the process of combing the combed cotton fibers. Step S4, web laying: spread the combed cotton fibers into a web; Step S5, hydroentangling: The cotton web is hydroentangled to cause the cotton fibers to entangle and form an all-cotton hydroentangled nonwoven fabric. Step S6, finishing, degrease and bleach the all-cotton spunlace nonwoven fabric to remove wax, impurities and natural pigments from the surface of cotton fibers, and improve water absorption, cleanliness and whiteness. Step S7, drying: The finished cotton spunlace nonwoven fabric is dried to obtain the base fabric. The drying temperature is 100-140℃, the drying speed is 50-80m / min, the drying time is 5-20s, and the moisture regain of the obtained base fabric is 4-8%.

[0029] Furthermore, the polyol is one or more of the following: glycerol, 1,2-propanediol, 1,3-propanediol, 1,3-butanediol, 1,2-pentanediol, 1,2-hexanediol, dipropylene glycol, polyethylene glycol-8, polyethylene glycol-400, polyethylene glycol-600, sorbitol, xylitol, and erythritol.

[0030] Polyols have small molecular weights and high viscosity, which is beneficial for the absorption of cotton spunlace nonwoven fabrics. Furthermore, the numerous hydroxyl groups in polyols can form a protective film on the surface of the base fabric using their own structure, capturing water molecules and effectively reducing moisture evaporation to achieve a water-locking effect. At the same time, they also improve the overall skin feel, providing a smooth touch.

[0031] Furthermore, the preservative is one or more of phenoxyethanol, ethylhexylglycerin, chlorphenesin, p-hydroxyacetophenone, sodium benzoate, benzalkonium chloride, and cetylpyridinium chloride.

[0032] A small amount of water-soluble, odorless preservative is added to ensure both preservation and safety during use.

[0033] Furthermore, the softener is one or more of cetrimonium chloride, dipalmitoyl ethyl hydroxyethyl methyl ammonium sulfate, methyl sulfonate of esterified unsaturated fatty acids, methyl ester salt of unsaturated fatty acid-2-hydroxy-N,N-bis(2-hydroxyethyl)-N-methylacetyl ammonium sulfate, fatty acid ester of dihydroxyethyl dimethyl ammonium chloride, polyquaternium-7, and cetearyl alcohol.

[0034] Among them, cetrimonium chloride, dipalmitoyl ethyl hydroxyethyl methyl ammonium sulfate, methyl sulfonate of unsaturated fatty acid esters, and methyl ester salt of unsaturated fatty acid-2-hydroxy-N,N-bis(2-hydroxyethyl)-N-methylacetyl ammonium sulfate are cationic softeners; fatty acid esters of dihydroxyethyl dimethyl ammonium chloride, polyquaternium-7, and cetearyl alcohol are nonionic softeners. Cellulose carries a weak negative charge on its surface in water, while cationic softeners carry a positive charge. After spraying, they can actively and rapidly adsorb onto the fiber surface, achieving excellent surface smoothness and antistatic effects with only a very small amount added. Although nonionic softeners are uncharged, the combination of nonionic and cationic softeners can improve the water retention performance of all-cotton spunlace nonwoven fabric. This embodiment uses only cationic and / or nonionic softeners, with low addition amounts and significant softening effects. Compared to silicone-containing softeners, it effectively ensures fiber strength and reduces fiber pilling.

[0035] Furthermore, the organic solvent is one or more of ethanol, isopropanol, and n-propanol.

[0036] Organic solvents, acting as a carrier for creams, help the various ingredients to be evenly dispersed on the surface of the base fabric.

[0037] In one specific embodiment, the ingredients of the cream, by weight, include: 1 part deionized water, 5 parts glycerin, 0.05 parts phenoxyethanol, 0.5 parts cetrimonium chloride, and 0.1 parts ethanol; Alternatively, the ingredients of the cream, by weight, include: 2.5 parts deionized water, 6.5 parts glycerin, 0.1 parts phenoxyethanol, 1.5 parts cetrimonium chloride, and 0.3 parts ethanol; Alternatively, the ingredients of the cream, by weight, include: 4 parts deionized water, 8 parts glycerin, 0.2 parts phenoxyethanol, 3 parts cetrimonium chloride, and 0.5 parts ethanol; Alternatively, the ingredients of the cream, by weight, include: 2.5 parts deionized water, 6.5 parts polyethylene glycol-400, 0.1 parts cetylpyridinium chloride, 1.5 parts dipalmitoyl ethyl hydroxyethyl methyl ammonium sulfate, and 0.3 parts n-propanol; Alternatively, the ingredients of the cream, by weight, include: 2.5 parts deionized water, 6.5 parts xylitol, 0.1 parts ethylhexylglycerin, 1.5 parts cetearyl alcohol, and 0.3 parts ethanol.

[0038] In some specific implementations, the static curing process specifically includes: covering the nonwoven fabric obtained in step (3) with a PE film, and then placing it in an environment with a temperature of 15-25℃ and a humidity of 60-80% for curing, with a static curing time of 12-24 hours.

[0039] During the static curing process, the nonwoven fabric is completely wrapped with a PE film, which can effectively reduce moisture loss and ensure that the moisture content of the resulting all-cotton cream nonwoven fabric is stable between 10-20%.

[0040] This invention also provides: a cotton cream nonwoven fabric, prepared by the above method. The obtained cotton cream nonwoven fabric has a softness of 350-500 mN in the MD direction, a softness of 100-150 mN in the CD direction, a water absorption of 500-600%, a strength of 50-60 N in the MD direction, a strength of 25-40 N in the CD direction, a thickness of 0.35 mm-0.50 mm, and an abrasion resistance ≥ level 3.

[0041] The technical solution of the present invention will be further described in detail below through specific embodiments and comparative examples.

[0042] Example 1 This embodiment describes a method for preparing a pure cotton cream nonwoven fabric, including the following steps: (1) Base fabric preparation: The spunlace nonwoven fabric formed by cleaning, combing, combing, web laying, hydroentanglement reinforcement and finishing is placed in a dryer for drying. The dryer parameters are set as follows: temperature 120℃, speed 65m / min, time 12 seconds.

[0043] (2) Cream preparation: Take 2.5 parts deionized water, 6.5 parts glycerin, 0.1 parts phenoxyethanol, 1.5 parts cetrimonium chloride and 0.3 parts ethanol by weight; pour the above raw materials into the mixing tank and stir at 55 rpm for 10 min.

[0044] (3) Atomized spraying: The cream obtained in step (2) is sprayed onto the base fabric obtained in step (1) using an ultrasonic atomizer; the spraying parameters are set as follows: spraying distance 18cm, spraying particle size 30μm, and spraying amount 5mL / cm².

[0045] (4) Static curing: The spunlace nonwoven fabric with cream sprayed in step (3) is wrapped with PE film and placed in an environment of 15°C and 70% humidity for 18 hours to obtain all-cotton cream nonwoven fabric.

[0046] The viscosity, whiteness, and pH of the cream obtained in Example 1 were tested, and the results showed that the cream had a viscosity of 35 mPa·s, a pH of 6, and a whiteness of 85.

[0047] Example 2 This embodiment describes a method for preparing a pure cotton cream nonwoven fabric, including the following steps: (1) Base fabric preparation: The spunlace nonwoven fabric formed by cleaning, combing, combing, web laying, hydroentanglement reinforcement and finishing is placed in a dryer for drying. The dryer parameters are set as follows: temperature 100℃, speed 50m / min, time 20 seconds.

[0048] (2) Cream preparation: Take 1 part deionized water, 5 parts 1,2-propanediol, 0.05 parts sodium benzoate, 0.5 parts polyquaternium-7, and 0.1 parts isopropanol by weight; pour the above raw materials into the mixing tank and stir at 55 rpm for 10 min.

[0049] (3) Atomized spraying: The cream obtained in step (2) is sprayed onto the base fabric obtained in step (1) using an ultrasonic atomizer; the spraying parameters are set as follows: spraying distance 10cm, spraying particle size 10μm, and spraying amount 3mL / cm².

[0050] (4) Static curing: The spunlace nonwoven fabric with cream sprayed in step (3) is wrapped with PE film and placed in an environment of 15°C and 60% humidity for 12 hours to obtain all-cotton cream nonwoven fabric.

[0051] The viscosity, whiteness, and pH of the cream obtained in Example 2 were tested, and the results showed that the cream had a viscosity of 48 mPa·s, a pH of 5, and a whiteness of 82.

[0052] Example 3 This embodiment describes a method for preparing a pure cotton cream nonwoven fabric, including the following steps: (1) Base fabric preparation: The spunlace nonwoven fabric formed by cleaning, combing, combing, web laying, hydroentanglement reinforcement and finishing is placed in a dryer for drying. The dryer parameters are set as follows: temperature 140℃, speed 80m / min, time 5 seconds.

[0053] (2) Cream preparation: Take 4 parts by weight of deionized water, 8 parts of polyethylene glycol-400, 0.2 parts of cetylpyridinium chloride, 3 parts of dipalmitoyl ethyl hydroxyethyl methyl ammonium sulfate, and 0.5 parts of n-propanol; pour the above raw materials into the mixing tank and stir at 55 rpm for 10 min.

[0054] (3) Atomized spraying: The cream obtained in step (2) is sprayed onto the base fabric obtained in step (1) using an ultrasonic atomizer; the spraying parameters are set as follows: spraying distance 25cm, spraying particle size 50μm, and spraying amount 8mL / cm².

[0055] (4) Static curing: The spunlace nonwoven fabric with cream sprayed in step (3) is wrapped with PE film and placed in an environment of 25°C and 80% humidity for 24 hours to obtain all-cotton cream nonwoven fabric.

[0056] The viscosity, whiteness, and pH of the cream obtained in Example 3 were tested, and the results showed that the cream had a viscosity of 25 mPa·s, a pH of 7, and a whiteness of 88.

[0057] Example 4 This embodiment describes a method for preparing a pure cotton cream nonwoven fabric, including the following steps: (1) Base fabric preparation: The spunlace nonwoven fabric formed by cleaning, combing, combing, web laying, hydroentanglement reinforcement and finishing is placed in a dryer for drying. The dryer parameters are set as follows: temperature 150℃, speed 80m / min, time 7 seconds.

[0058] (2) Cream preparation: Take 3 parts deionized water, 7 parts xylitol, 0.15 parts ethylhexylglycerin, 2 parts cetearyl alcohol and 0.4 parts ethanol by weight; pour the above raw materials into the mixing tank and stir at 55 rpm for 10 min.

[0059] (3) Atomized spraying: The cream obtained in step (2) is sprayed onto the base fabric obtained in step (1) using an ultrasonic atomizer; the spraying parameters are set as follows: spraying distance 20cm, spraying particle size 40μm, and spraying amount 6mL / cm².

[0060] (4) Static curing: The spunlace nonwoven fabric with cream sprayed in step (3) is wrapped with PE film and placed in an environment of 22°C and 75% humidity for 20 hours to obtain all-cotton cream nonwoven fabric.

[0061] The viscosity, whiteness, and pH of the cream obtained in Example 4 were tested, and the results showed that the cream had a viscosity of 40 mPa·s, a pH of 6.5, and a whiteness of 86.

[0062] Comparative Example 1 (Blank Control) The spunlace nonwoven fabric, which has undergone cleaning, combing, fine combing, web laying, hydroentanglement reinforcement, and finishing, is placed in a dryer for drying. The dryer parameters are set as follows: temperature 120℃, speed 65m / min, time 12 seconds. No cream spraying is performed, and no static curing is carried out.

[0063] Comparative Example 2 Comparative Example 2 was prepared using the preparation method of Example 1. The difference between Comparative Example 2 and Example 1 is that the cetrimonium chloride in the raw material formula was replaced with an equal amount of silicone-containing softener (decamethylcyclopentasiloxane D5). That is, the raw material components of Comparative Example 2 include: 2.5 parts of deionized water, 6.5 parts of glycerin, 0.1 parts of phenoxyethanol, 1.5 parts of decamethylcyclopentasiloxane D5, and 0.3 parts of ethanol.

[0064] Comparative Example 3 Comparative Example 3 uses the same cream raw material composition as Example 1. The difference between Comparative Example 3 and Example 1 is that the cream is applied to the spunlace nonwoven fabric by padding and no static curing operation is performed.

[0065] Specifically, the dried spunlace nonwoven fabric was directly impregnated in a cream with the same raw material composition as in Example 1, squeezed by pressure rollers, and then dried in a 120°C dryer for 12 seconds to obtain the sample of Comparative Example 3.

[0066] Comparative Example 4 Comparative Example 4 uses the same cream raw material composition as Example 1 and applies the cream to the spunlace nonwoven fabric using the same atomization spraying method. The difference between Comparative Example 4 and Example 1 is that no static curing operation is performed after spraying.

[0067] Performance tests were conducted on each embodiment and comparative example for softness, water absorption, strength, thickness, abrasion resistance, and fabric moisture content. The test results are summarized in Table 1.

[0068] The softness test was conducted according to GB / T 8942-2016 Determination of Paper Softness; the water absorption, strength and fabric surface moisture content test standards were conducted according to GB / T 40276-2021 Determination of Soft Towels; the thickness test was conducted according to GB / T 24218.2-2009 Textiles - Test Methods for Nonwoven Fabrics - Part 2 Determination of Thickness; and the abrasion resistance was conducted according to GB / T 4802.2-2008 Textiles - Determination of Pilling and Friction Properties - Part 2 Modified Martindale Method. During the test, a 260g loading block was used, and the number of rubbing cycles was set to 30.

[0069] Table 1: Summary of Performance Test Data

[0070] As shown in Table 1, the all-cotton cream nonwoven fabrics obtained in Examples 1-4 have good softness (MD direction between 360-480mN, CD direction between 105-135mN); water absorption between 510-580%; and stable elasticity (MD direction between 51-58N, CD direction between 26-36N).

[0071] As can be seen from the comparison between Comparative Example 1 and Example 1, the nonwoven fabric without added cream is extremely dry, stiff and rough, and its softness is unqualified.

[0072] As can be seen from the comparison between Comparative Example 2 and Example 1, although adding silicone-containing softeners as cream raw materials can improve the softness of nonwoven fabrics, their water absorption, strength and abrasion resistance drop sharply.

[0073] As can be seen from the comparison between Comparative Example 3 and Example 1, applying the cream to the base fabric by padding will cause the fabric thickness to shrink significantly and the dried fabric surface to be too hard.

[0074] As can be seen from the comparison between Comparative Example 4 and Example 1, the nonwoven fabric obtained without curing operation did not have its cream penetrate into the nonwoven fabric interior, and the cream was unevenly distributed on the surface of the nonwoven fabric. The nonwoven fabric had a high water content and its water absorption was lower than that of the sample that had undergone curing treatment.

[0075] The above embodiments are preferred implementations of the present invention. In addition, the present invention can be implemented in other ways. Any obvious substitutions without departing from the concept of the present invention are within the protection scope of the present invention.

Claims

1. A method for preparing a nonwoven fabric with a pure cotton cream, characterized in that, Includes the following steps: (1) Base fabric preparation: The fiber raw material of cotton fiber is obtained by cleaning, combing, web laying, hydroentangling and drying the fiber raw material; (2) Cream preparation: Weigh and mix the raw materials according to the following weight parts: water 1-4 parts, polyol 5-8 parts, preservative 0.05-0.2 parts, softener 0.5-3 parts, organic solvent 0.1-0.5 parts, stir evenly to obtain cream; (3) Atomized spraying: The cream obtained in step (2) is sprayed onto the base fabric obtained in step (1) by ultrasonic atomization or high-pressure airflow atomization. (4) Standing and curing: The non-woven fabric obtained in step (3) is placed in an environment with a temperature of 15-25℃ and a humidity of 60-80% for curing for 12-24 hours to obtain all-cotton cream non-woven fabric. The moisture content of the cotton cream nonwoven fabric is 10-20%.

2. The method for preparing a pure cotton cream nonwoven fabric according to claim 1, characterized in that, The polyol is one or more of the following: glycerol, 1,2-propanediol, 1,3-propanediol, 1,3-butanediol, 1,2-pentanediol, 1,2-hexanediol, dipropylene glycol, polyethylene glycol-8, polyethylene glycol-400, polyethylene glycol-600, sorbitol, xylitol, and erythritol.

3. The method for preparing a pure cotton cream nonwoven fabric according to claim 1, characterized in that, The preservative is one or more of phenoxyethanol, ethylhexylglycerin, chlorphenesin, p-hydroxyacetophenone, sodium benzoate, benzalkonium chloride, and cetylpyridinium chloride.

4. The method for preparing a pure cotton cream nonwoven fabric according to claim 1, characterized in that, The softener is one or more of cetrimonium chloride, dipalmitoyl ethyl hydroxyethyl methyl ammonium sulfate, methyl sulfonate of esterified unsaturated fatty acids, methyl ester salt of unsaturated fatty acid-2-hydroxy-N,N-bis(2-hydroxyethyl)-N-methylacetyl ammonium sulfate, fatty acid ester of dihydroxyethyl dimethyl ammonium chloride, polyquaternium-7, and cetearyl alcohol.

5. The method for preparing a pure cotton cream nonwoven fabric according to claim 1, characterized in that, The organic solvent is one or more of ethanol, isopropanol, and n-propanol.

6. The method for preparing a pure cotton cream nonwoven fabric according to claim 1, characterized in that, The specific steps (4) include: wrapping the nonwoven fabric obtained in step (3) with PE film, and then placing it in an environment with a temperature of 15-25℃ and a humidity of 60-80% for 12-24 hours to mature.

7. The method for preparing a pure cotton cream nonwoven fabric according to claim 1, characterized in that, In step (3), the spraying distance is 10-25 cm, the spraying particle size is 10-50 μm, and the spraying amount is 3-8 mL / cm. 2 .

8. The method for preparing a pure cotton cream nonwoven fabric according to claim 1, characterized in that, The cream has a viscosity ≤50 mPa·s, whiteness ≥80, and pH 4-8.

9. The method for preparing a pure cotton cream nonwoven fabric according to claim 1, characterized in that, In step (1), the drying temperature is 100-140℃, the drying speed is 50-80m / min, the drying time is 5-20s, and the moisture regain of the base fabric is 4-8%.

10. A nonwoven fabric with a pure cotton cream filling, characterized in that, It is prepared by the preparation method according to any one of claims 1-9.

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