Processing method and application of partially degreased pure cotton spunlace non-woven fabric

Abstract

The invention discloses a processing method and application of partially degreased pure cotton spunlace non-woven fabric, and belongs to the technical field of non-woven fabric. The processing method of the partially degreased pure cotton spunlace non-woven fabric comprises the following steps: S1, pre-treating a pure cotton spunlace coiled gray fabric; s2, a refining agent, a stabilizer and an accelerant are added for degreasing treatment; s3, heating for the first time, and adding a bleaching agent for treatment; continuously heating for boiling and bleaching for the second time; s4, cooling, emptying, adding a buffering agent for treatment, and adjusting the pH value to finish degreasing; in the step S1, the refining agent is a refining agent. Compared with pure cotton plain spunlace cloth prepared through a conventional caustic soda method, the pure cotton spunlace non-woven fabric processed through the method is better in dry and comfortable performance, punching is not needed, after-treatment is not needed, and no extra water repellent is added. When being applied to hygienic products, the fabric enhances the dry and comfortable feeling, the liquid reverse osmosis level is low, and the contact between the skin and a pure cotton material is more comfortable.

Description

Technical Field

[0001] The invention relates to the technical field of nonwoven fabrics, and in particular to a processing method and application of a partially degreased pure cotton spunlace nonwoven fabric. Background Art

[0002] Cotton fiber contains pectin, wax and other ingredients, which make it naturally water-repellent. In order to improve the hydrophilicity of cotton fiber, the common traditional method is to use caustic soda + hydrogen peroxide to remove the pectin and wax components in the fiber, and bleach it at the same time. The cotton fiber after degreasing and bleaching has good water absorption and whiteness; however, the spunlace fabric produced by this method has poor drying performance, and it is often treated by adding water repellent through post-finishing to improve its dryness, but the addition of chemical reagents affects the performance of cotton fibers in sanitary products and is prone to cause human allergies. At present, there is also a way to retain the natural wax protective layer in the raw cotton through mechanical impurity removal to achieve semi-water repellency, but the processing method is complicated and there are still problems of residual fine impurities and poor whiteness and strength.

[0003] Therefore, it is of great significance to provide a method for processing pure cotton spunlace nonwoven fabrics that does not require the addition of additional water repellents and has good drying properties while ensuring hydrophilicity. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a processing method for partially degreased pure cotton spunlace nonwoven fabric, which has good dryness performance and ensures hydrophilicity without the need to add additional water repellent for finishing.

[0005] The invention also provides a partially degreased pure cotton spunlace nonwoven fabric.

[0006] The invention also provides a sanitary napkin.

[0007] The first aspect of the present invention provides a method for processing a partially degreased pure cotton spunlace nonwoven fabric, the processing method comprising the following steps:

[0008] S1. Pre-treating the pure cotton spunlace rolled grey fabric;

[0009] S2, adding refining agent, stabilizer and accelerator for degreasing treatment;

[0010] S3, heating for the first time, adding bleaching agent for treatment; continuing to heat for the second time, boiling and bleaching;

[0011] S4, cooling, emptying, adding buffer, adjusting pH to complete degreasing;

[0012] The processing method of partially defatted pure cotton spunlace nonwoven fabric according to the first aspect of the present invention has at least the following beneficial effects:

[0013] The present invention uses a solid scouring agent as a degreasing agent for degreasing treatment, makes the aqueous solution weakly alkaline by hydrolysis, and uses it in coordination with other additives to partially retain the pectin and wax components in the cotton fiber, so that the prepared pure cotton spunlace non-woven fabric has natural water repellency without adding additional water repellents, thereby reducing possible adverse effects on the human body. Compared with the traditional complete degreasing method, the partial degreasing process can improve the dryness of the pure cotton spunlace fabric, reduce liquid reverse osmosis, effectively enhance the dryness of the sanitary napkin, and make the contact between the skin and the pure cotton material more comfortable.

[0014] The present invention ensures the uniformity of bleaching and degreasing through the fine control of two heating steps, avoids the process instability caused by too high or too low processing temperature, and improves the quality of the product.

[0015] In traditional processes, caustic soda is the most effective degreasing agent. It is a strong alkaline substance that can quickly and thoroughly remove pectin and wax components in cotton fibers. However, the strong effect of caustic soda often excessively removes natural components in the fibers, causing the fibers to lose their natural water repellency. Finally, it is necessary to add a water repellent through post-finishing to restore the water repellency. Refining agents, as a fatty acid salt, are generally considered to be materials used for saponification and lubrication. The saponification of the refining agent will cause a layer of fatty acid salt film to form on the fiber surface, which may hinder further bleaching and degreasing processes. The present invention discovered and utilized the selective degreasing effect of the refining agent under mild conditions for the first time, and through a synergistic combination with other raw materials, successfully achieved partial degreasing and moderate bleaching, avoiding the shortcomings of excessive degreasing in traditional processes. This combination not only retains the natural water repellency of cotton fibers, but also improves the dryness and safety of the product.

[0016] According to some embodiments of the present invention, in step S1, the pretreatment is a water washing treatment.

[0017] According to some embodiments of the present invention, the water washing treatment is performed for 10 to 15 minutes.

[0018] According to some embodiments of the present invention, in step S2, the temperature of the degreasing treatment is 40-50°C.

[0019] Among them, in the degreasing process, if the temperature is low, the degreasing effect is poor, and if the temperature is high, the degreasing is too strong, and the best effect cannot be achieved.

[0020] According to some embodiments of the present invention, in step S2, the low-temperature degreasing treatment is performed for 10 to 30 minutes.

[0021] According to some embodiments of the present invention, in step S3, the temperature after the first heating is 60-70°C.

[0022] According to some embodiments of the present invention, in step S3, the time for adding bleaching agent for treatment is 10 to 20 minutes.

[0023] According to some embodiments of the present invention, in step S3, the temperature after the second heating is 98-105°C.

[0024] According to some embodiments of the present invention, in step S3, the second post-heating blanching time is 40 to 50 minutes.

[0025] Among them, the present invention can effectively protect the grease of cotton fibers through two temperature rising treatments, and prevent the grease from being removed quickly.

[0026] According to some embodiments of the present invention, in step S4, the temperature after cooling is 35-50°C.

[0027] According to some embodiments of the invention, the refining agent includes at least one of sodium stearate, sodium laurate, sodium oleate and sodium palmitate.

[0028] Preferably, the refining agent is sodium stearate.

[0029] According to some embodiments of the invention, the stabilizer is sodium sulfate.

[0030] According to some embodiments of the invention, the accelerator is sodium bicarbonate.

[0031] According to some embodiments of the invention, the bleaching agent is hydrogen peroxide.

[0032] According to some embodiments of the invention, the buffer is citric acid.

[0033] According to some embodiments of the present invention, the amount of the processed raw material added is:

[0034] Refining agent 50-80kg, stabilizer 15-20kg, accelerator 70-80kg, bleaching agent 190-210kg, buffer 5-8kg.

[0035] Preferably, the added amount of the processing raw materials is:

[0036] 60kg of refining agent, 15kg of stabilizer, 75kg of accelerator, 200kg of bleaching agent, and 6kg of buffer.

[0037] The second aspect of the present invention provides a partially degreased pure cotton spunlace nonwoven fabric obtained by the above processing method.

[0038] The third aspect of the present invention provides a sanitary napkin, comprising the partially degreased pure cotton spunlace nonwoven fabric obtained by the above processing method.

[0039] According to some embodiments of the present invention, the structure of the sanitary napkin includes, in sequence, the partially defatted pure cotton spunlace non-woven fabric surface layer, the hot air cloth guide layer, wood pulp, an absorbent resin layer, a breathable bottom film and a coating.

[0040] If there is no special explanation, the actual meaning of “about” in the present invention is that the error is allowed to be within the range of ±2%, for example, about 100 is actually 100±2%×100.

[0041] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present invention. DETAILED DESCRIPTION

[0042] The embodiments of the present invention are described in detail below, and the same or similar reference numerals throughout the embodiments represent the same or similar elements or elements with the same or similar functions. The embodiments described below are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0043] In the description of the present invention, if there is a description of first, second, etc., it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0044] The words "preferably", "more preferably", etc. in the present invention refer to embodiments of the present invention that may provide certain beneficial effects in certain circumstances. However, other embodiments may also be preferred under the same circumstances or other circumstances. In addition, the description of one or more preferred embodiments does not imply that other embodiments are not applicable, nor is it intended to exclude other embodiments from the scope of the present invention.

[0045] When a numerical range is disclosed herein, the above range is considered to be continuous and includes the minimum and maximum values ​​of the range, as well as every value between such minimum and maximum values. Further, when a range refers to an integer, every integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe features or characteristics, the ranges can be combined. In other words, unless otherwise indicated, all ranges disclosed herein should be understood to include any and all subranges included therein.

[0046] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of the present invention.

[0047] Unless otherwise specified, the reagents, methods and equipment used in the present invention are conventional reagents, methods and equipment in the art.

[0048] Example 1

[0049] This embodiment provides a method for processing a partially degreased pure cotton spunlace nonwoven fabric, comprising the following steps:

[0050] 1) Place the pure cotton spunlace rolls into a boiling and bleaching pot, wash with water for 10 minutes, and drain;

[0051] 2) Add water again, add 60kg of refining agent and 15kg of sodium sulfate at 45℃, act for 25min, then add 75kg of sodium bicarbonate and act for 10min;

[0052] 3) Raise the temperature to 60°C, add 200 kg of hydrogen peroxide, and react for 20 minutes;

[0053] 4) Raise the temperature to 105°C and allow to act for 40 minutes;

[0054] 5) Cool down to 40°C, drain, add 6 kg of citric acid and wash until pH is neutral to complete degreasing.

[0055] This embodiment also provides partially degreased pure cotton spunlace nonwoven fabric obtained by the above processing method and its application, which is applied to the surface layer of sanitary napkins. The structure of the sanitary napkin is: partially degreased pure cotton spunlace nonwoven fabric surface layer + hot air cloth guide layer + wood pulp + SAP + breathable bottom film + envelope.

[0056] Example 2

[0057] 1) Place the pure cotton spunlace rolls into a boiling and bleaching pot, wash with water for 10 minutes, and drain;

[0058] This embodiment provides a processing method and application of a partially degreased pure cotton spunlace nonwoven fabric, comprising the following steps:

[0059] 2) Add water again, add 80kg of refining agent and 20kg of sodium sulfate at 50℃, let it act for 30min, then add 80kg of sodium bicarbonate and let it act for 20min;

[0060] 3) Raise the temperature to 70°C, add 190 kg of hydrogen peroxide, and react for 20 minutes;

[0061] 4) Raise the temperature to 105°C and allow to act for 50 minutes;

[0062] 5) Cool down to 40°C, drain, add 6 kg of citric acid and wash until pH is neutral to complete degreasing.

[0063] This embodiment also provides partially degreased pure cotton spunlace nonwoven fabric obtained by the above processing method and its application, which is applied to the surface layer of sanitary napkins. The structure of the sanitary napkin is: partially degreased pure cotton spunlace nonwoven fabric surface layer + hot air cloth guide layer + wood pulp + SAP + breathable bottom film + envelope.

[0064] Example 3

[0065] This embodiment provides a processing method and application of a partially degreased pure cotton spunlace nonwoven fabric, comprising the following steps:

[0066] 1) Place the pure cotton spunlace rolls into a boiling and bleaching pot, wash with water for 10 minutes, and drain;

[0067] 2) Add water again, add 50kg of refining agent and 20kg of sodium sulfate at 40℃, let it act for 20min, then add 70kg of sodium bicarbonate and let it act for 20min;

[0068] 3) Raise the temperature to 60°C, add 210 kg of hydrogen peroxide, and react for 20 minutes;

[0069] 4) Raise the temperature to 98°C and allow to act for 40 minutes;

[0070] 5) Cool down to 40°C, drain, add 6 kg of citric acid and wash until pH is neutral to complete degreasing.

[0071] This embodiment also provides partially degreased pure cotton spunlace nonwoven fabric obtained by the above processing method and its application, which is applied to the surface layer of sanitary napkins. The structure of the sanitary napkin is: partially degreased pure cotton spunlace nonwoven fabric surface layer + hot air cloth guide layer + wood pulp + SAP + breathable bottom film + envelope.

[0072] Comparative Example 1

[0073] This comparative example 1 provides a plain woven pure cotton spunlace fabric, which is different from the example 1 in that the conventional caustic soda method is used for degreasing.

[0074] Applied to the surface of sanitary napkins, the structure of sanitary napkins is: pure cotton plain spunlace fabric surface layer + hot air fabric guide layer + wood pulp + SAP + breathable bottom film + envelope.

[0075] Comparative Example 2

[0076] This comparative example provides a perforated pure cotton spunlace fabric, which is different from Example 1 in that a 22-mesh perforated pure cotton spunlace fabric is prepared by degreasing using a conventional caustic soda method and then finished with a water repellent (modified polyacrylate compound).

[0077] Applied to the surface of sanitary napkins, the structure of the sanitary napkin is: 22 mesh pure cotton semi-water-repellent spunlace fabric surface layer + hot air fabric guide layer + wood pulp + SAP + breathable bottom film + envelope.

[0078] Test Case

[0079] The product performance tests were carried out on Examples 1 to 3 and Comparative Examples 1 to 2. The test results are shown in Table 1.

[0080] Table 1 Performance results of products of Examples 1 to 3 and Comparative Examples 1 to 2

[0081]

[0082]

[0083] As can be seen from Table 1, the water absorption rate of the partially degreased pure cotton spunlace nonwoven fabrics prepared in Examples 1 to 3 of the present invention is lower than that of the pure cotton plain spunlace fabric prepared by the conventional caustic soda method in Comparative Example 1, which is reflected in the performance of the sanitary napkin, showing a significant reduction in liquid reverse osmosis and good dryness. The water absorption rate of the partially degreased pure cotton spunlace nonwoven fabrics in Examples 1 to 3 of the present invention is comparable to that of the 22-mesh pure cotton semi-water-repellent spunlace fabric prepared by the conventional caustic soda method + semi-water-repellent finishing in Comparative Example 2, which is reflected in the performance of the sanitary napkin, showing a lower liquid reverse osmosis and good dryness, but the present invention lacks the finishing process and is a process without adding additional water repellent.

[0084] The above is a detailed description of the embodiments of the present invention, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. A method for processing partially defatted pure cotton spunlace nonwoven fabric, characterized in that: The processing method comprises the following steps: S1. Pre-treating the pure cotton spunlace rolled grey fabric; S2, adding refining agent, stabilizer and accelerator for degreasing treatment; S3, heating for the first time, adding bleaching agent for treatment; continuing to heat for the second time, boiling and bleaching; S4, cooling, draining, adding buffer, adjusting pH to complete degreasing.

2. The processing method according to claim 1, characterized in that: In step S1, the pretreatment is a water washing treatment; preferably, the time of the water washing treatment is 10 to 15 minutes.

3. The processing method according to claim 1, characterized in that: In step S2, the temperature of the degreasing treatment is 40-50°C; preferably, in step S2, the time of the low-temperature degreasing treatment is 10-30 minutes.

4. The processing method according to claim 1, characterized in that: In step S3, the temperature after the first heating is 60-70°C; preferably, in step S3, the time for adding the bleaching agent for treatment is 10-20 minutes.

5. The processing method according to claim 1, characterized in that: In step S3, the temperature after the second heating is 98-105°C; preferably, in step S3, the blanching time after the second heating is 40-50 minutes.

6. The processing method according to claim 1, characterized in that: The refining agent includes at least one of sodium stearate, sodium laurate, sodium oleate and sodium palmitate; preferably, the stabilizer is sodium sulfate; preferably, the accelerator is sodium bicarbonate; preferably, the bleaching agent is hydrogen peroxide; preferably, the buffer is citric acid.

7. The processing method according to claim 1 or 6, characterized in that: The added amount of the processing raw materials is: Refining agent 50-80kg, stabilizer 15-20kg, accelerator 70-80kg, bleaching agent 190-210kg, buffer 5-8kg.

8. A partially degreased pure cotton spunlace nonwoven fabric obtained by the processing method according to any one of claims 1 to 7.

9. A sanitary napkin, characterized in that: It comprises a partially degreased pure cotton spunlace nonwoven fabric obtained by the processing method according to any one of claims 1 to 7.

10. The sanitary napkin according to claim 9, characterized in that The structure of the sanitary napkin includes the partially degreased pure cotton spunlace non-woven fabric surface layer, the hot air cloth guide layer, wood pulp, an absorbent resin layer, a breathable bottom film and a coating film in sequence.

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