Printed wood pulp spunlace non-woven fabric and preparation method thereof

Abstract

According to the printing wood pulp spunlace non-woven fabric and the preparation method, the color developing fiber layer design can achieve the effect that a color developing factor indicates the cleaning degree, and the wiping effect is not affected in a wet state; the water absorption layer can play a role in rapidly absorbing water after the non-woven fabric is in contact with the skin; the reinforcing layer is designed in the middle of the whole structure and has a good structure supporting effect, and the fiber strength of the reinforcing layer can enhance the whole mechanical practical effect; the spunlace non-woven fabric layer is designed by adopting modified wood pulp fibers, the elasticity, compactness and moisturizing effect of collagen are utilized, moisture can be further absorbed, the overall form is kept, the rice hull powder and the bamboo powder are wood fibers essentially, the moisture absorption effect is good, and the advantages of being environmentally friendly and biodegradable are achieved. The spunlace non-woven fabric provided by the invention also adopts a working solution impregnation process taking polyhexamethylene guanidine hydrochloride as a main body, so that the spunlace non-woven fabric has better antibacterial performance and can better meet the use requirements of consumers.

Description

Technical Field

[0001] The present invention relates to the technical field of non-woven fabric process improvement, and specifically relates to a printed wood pulp spunlace non-woven fabric and a preparation method thereof. Background Art

[0002] Non-woven fabric is a kind of non-woven cloth. It directly uses polymer chips, staple fibers or filaments to form a web of fibers through air flow or mechanical means, and then is reinforced by spunlace, needling, or hot rolling, and finally forms a non-woven cloth after post-treatment. Non-woven fabric has the characteristics of moisture-proof, breathable, flexible, lightweight, flame-retardant, non-toxic and odorless, low price, recyclable, etc. It can be used in different industries, such as sound insulation, heat insulation, heating pads, masks, clothing, medical use, filling materials, etc. With the continuous improvement of people's living standards and the expansion of industrial textiles into the field of daily life, people's functional requirements for new products and new materials are constantly increasing. Moreover, people's awareness of personal hygiene and care is constantly improving, and the demand for facial cleansing products is increasing, especially disposable wet wipes, which are increasingly favored due to their convenience.

[0003] However, traditional disposable wet wipes are mostly made of cellulose fiber spunlace non-woven fabric. Although they are convenient to use, they usually can only perform basic cleaning functions and cannot effectively show whether the face has been thoroughly cleaned. Moreover, they also have deficiencies such as poor light resistance, single product style, and poor water absorption. Existing technologies have tried to use color-developing factors such as anthocyanins to indicate the cleaning degree, but these methods have limitations, such as poor wiping effect in the wet state and inability to completely remove the residual moisture on the face. In current research, the process of flushable and wood pulp composite spunlace printed non-woven fabric is becoming more and more popular among enterprises and researchers, and this product can better meet people's ever-growing material needs.

[0004] In summary, we propose a printed wood pulp spunlace composite non-woven fabric. The design of this non-woven fabric includes a printed layer to make the product more beautiful; and this non-woven fabric also includes a wood pulp spunlace non-woven fabric layer for absorbing and drying the residual moisture on the face. Summary of the Invention

[0005] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a printed wood pulp spunlace composite non-woven fabric.

[0006] To achieve the above purpose, the present invention proposes the following technical solutions:

[0007] A printed wood pulp spunlace non-woven fabric, comprising a non-woven fabric base cloth;

[0008] Spunlace non-woven fabric layers are provided on both sides of the non-woven fabric base cloth, and the spunlace non-woven fabric layers are used to composite wood pulp fibers on both sides of the non-woven fabric base cloth layer by the spunlace method;

[0009] The spunlace non-woven fabric layer is adhesively bonded with a reinforcing layer, a water-absorbing layer, and a color-developing fiber layer in sequence through a hot-melt adhesive web;

[0010] The wood pulp fibers of the spunlace non-woven fabric layer are modified natural wood pulp fibers;

[0011] The reinforcing layer is a PET fiber layer;

[0012] A printing layer is further provided on one side of the color-developing fiber layer away from the water-absorbing layer.

[0013] Further, the modified natural wood pulp fibers are obtained by naturally drying the natural wood pulp fibers after being impregnated and calendared twice with a modified impregnating solution, wherein the impregnation and calendaring bath ratio is 1:20.

[0014] Further, by weight parts, the modified impregnating solution comprises the following raw material components:

[0015] Polyethylene glycol 45 - 55 parts;

[0016] Collagen 10 - 15 parts;

[0017] Rice husk powder 1 - 5 parts;

[0018] Bamboo powder 1 - 5 parts;

[0019] The balance is pure water.

[0020] Further, the particle size of the rice husk powder and the bamboo powder is 100 - 200 nm.

[0021] Further, the molecular weight of the polyethylene glycol is 1000 - 6000.

[0022] Further, the preparation method of the printed wood pulp spunlace non-woven fabric comprises the following steps:

[0023] Step S1, preparing materials

[0024] Prepare the modified impregnating solution and process the natural wood pulp fibers to obtain modified natural wood pulp fibers;

[0025] Step S2, laying and spunlacing

[0026] Carry out the steps of loosening, carding, mixing, forming on the net, spunlace reinforcement, drying, and slitting on the modified natural wood pulp fibers to form a sandwich-type non-woven fabric, that is, a non-woven fabric base cloth with spunlace non-woven fabric layers on both sides;

[0027] Step S3, non-woven fabric compounding

[0028] Prepare PET fibers, lay them into a web, and bond them together with hot melt adhesive to form a PET fiber reinforcement layer with a cross-network structure in the horizontal direction. Then, laminate the sandwich non-woven fabric onto the PET fiber reinforcement layer to form a multi-layer non-woven fabric with a reinforcement layer. Similarly, a reinforcement layer is also formed by laminating the sandwich non-woven fabric on the other side with PET fibers. Then, an absorbent layer and a chromogenic fiber layer are sequentially formed on the reinforcement layer in the same manner to form a composite non-woven fabric.

[0029] Step S4: Wetting treatment

[0030] Prepare a working solution, and perform pre-wetting treatment on the composite non-woven fabric obtained in step S3 so that the moisture content of the non-woven fabric is more than 50% to obtain a wetted non-woven fabric.

[0031] Step S5: Coloring treatment

[0032] Prepare a uniformly dispersed coloring masterbatch with nano-ecological dyes, and dip-roll the treated wetted non-woven fabric in the coloring masterbatch, where the temperature of the coloring masterbatch is 70°C - 85°C.

[0033] Step S6: Post-treatment and packaging

[0034] Dry and re-moisten the dip-rolled non-woven fabric, and then perform printing treatment on the surface of the non-woven fabric to obtain a printed wood pulp spunlace non-woven fabric. Then, after sampling the prepared printed wood pulp spunlace non-woven fabric and conducting various tests, package the finished product.

[0035] Furthermore, the working solution described in step S4, by weight, includes the following raw material components:

[0036] Polyhexamethylene guanidine hydrochloride 7 - 13 parts;

[0037] Benzalkonium chloride 5 - 7 parts;

[0038] Phenoxyethanol 4 - 6 parts;

[0039] Ethylhexylglycerin 2 - 4 parts;

[0040] Dipropylene glycol 7 - 9 parts;

[0041] Propylene glycol 3 - 5 parts;

[0042] Citric acid 0.5 - 1.5 parts;

[0043] The balance is pure water.

[0044] Furthermore, during the spunlace process described in step S2, the wood pulp fiber web is spunlaced from the front or the back by a spunlace machine.

[0045] Furthermore, in step S5, the coloring mother liquor is prepared by dispersing the nano-ecological dye by microwave oscillation, the pH value of the coloring mother liquor is controlled to be 5.0-6.8, and the concentration is 0.1%-2%; and the immersion time of the coloring mother liquor is greater than 15 seconds, and 2 immersions are used.

[0046] Furthermore, the moisture content of the printed wood pulp spunlace nonwoven fabric produced in step S6 is 5%-8%.

[0047] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0048] The invention discloses a printed wood pulp spunlace nonwoven fabric and a preparation method thereof. The color developing fiber layer of the invention is designed to achieve the effect of color developing factor indicating the degree of cleanliness, and the wiping effect is not affected in a wet state; the water absorbing layer can play a role of quickly absorbing water after the nonwoven fabric contacts the skin; the reinforcing layer is designed in the middle of the whole structure, and has a good supporting structure effect, and its fiber strength can enhance the overall mechanical practical effect; the spunlace nonwoven fabric layer is designed by using modified wood pulp fiber, and can further absorb water and maintain the overall shape by utilizing the elasticity, firmness and moisturizing effect of collagen; rice husk powder and bamboo powder are essentially wood fibers, which not only have good moisture absorption, but also have the advantages of being environmentally friendly and biodegradable. The spunlace nonwoven fabric of the invention also adopts a working liquid impregnation process with polyhexamethylene guanidine hydrochloride as the main body, has good antibacterial properties, and can better meet the use requirements of consumers.

[0049] It should be appreciated that all combinations of the foregoing concepts, as well as additional concepts described in greater detail below, may be considered part of the present subject matter disclosure to the extent such concepts are not mutually inconsistent.

[0050] The foregoing and other aspects, embodiments and features of the present invention will be more fully understood from the following description. Other additional aspects of the present invention, such as the features and / or beneficial effects of the exemplary embodiments, will be apparent from the following description or will be learned from the practice of the specific embodiments according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0052] Figure 1 This is a schematic diagram of the structure of the printed wood pulp spunlace nonwoven fabric of the present application;

[0053] Figure 2This is the process flow chart for the preparation of this application.

[0054] Among them, 1 is the non-woven base fabric layer; 2 is the spunlace non-woven fabric layer; 3 is the reinforcing layer; 4 is the water-absorbing layer; 5 is the color-developing fiber layer. Detailed implementation manners

[0055] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the preferred implementation manners of the present invention will be described below in conjunction with specific embodiments, but it should not be construed as a limitation to this patent.

[0056] In the following examples / comparative examples, the test methods or testing methods described, unless otherwise specified, are all conventional methods; the reagents and materials, unless otherwise specified, are all obtained from conventional commercial channels or prepared by conventional methods.

[0057] In the present invention, the modified natural wood pulp fiber is obtained by natural drying after the natural wood pulp fiber is impregnated and rolled twice with a modified impregnating solution, wherein the impregnation and rolling bath ratio is 1:20. Further, the polyethylene glycol and water in the modified impregnating solution are stirred and dissolved at 60 °C for 3 h in a certain proportion, and at the same time, the collagen is soaked and swollen in distilled water twice its mass at room temperature for 3 h. The rice husk powder and bamboo powder are mixed in proportion and then configured into a homogeneous mixed liquid with a concentration of 2.5 wt%. After the polyethylene glycol is dissolved, it is naturally cooled to room temperature, and the swollen collagen and the mixed liquid are added to the polyethylene glycol at the same time and stirred until uniform to obtain a homogeneous suspension. Then the natural wood pulp fiber is impregnated and rolled twice in the modified impregnating solution and then naturally dried to obtain the modified natural wood pulp fiber.

[0058] Among them, the rice husk powder is purchased from Ruixuan Mineral Products Processing Factory in Lingshou County. The rice husk powder has the characteristics of light weight, porousness and moisture absorption, and can be used as a natural cleaning filler, with the characteristics of safe decontamination without damaging the surface. During use, the rice husk powder needs to be passed through water, dried and then sieved to ensure that the particle size of the used powder is 100 - 200 nm. Still further, the bamboo powder is purchased from Xinyuan Bamboo Products Factory in Lingchuan County. Bamboo powder is a powdery substance processed from bamboo, which belongs to renewable resources and is harmless to the environment, and is a good environmental protection additive. The microstructure of bamboo powder mainly includes vascular bundles and parenchyma cell matrices. The vascular bundles are arranged neatly along the axial direction and are the main load-bearing elements, making the bamboo have higher strength and stiffness; the parenchyma cells mainly play the role of connecting and transmitting loads. Bamboo powder has a large surface area and good surface activity, and has good adsorption and toughness. The bamboo powder in the present invention also contains 0.5 - 1.5% of bamboo white frost. The main components of bamboo white frost are bamboo leaf flavonoids and bamboo leaf polyphenols, which have strong antioxidant properties, can effectively scavenge free radicals in the body, prevent cells from being damaged, and have good moisturizing and anti-aging effects, and can delay the aging process. At the same time, they also have anti-inflammatory, antibacterial, antiviral and other effects, which are very helpful for the prevention and treatment of some diseases.

[0059] Rice husk powder belongs to natural organic substances such as cellulose and hemicellulose, and its surface contains abundant hydroxyl and hydroxyl oxide groups. Bamboo powder belongs to the same kind of substances, and the hydroxyl groups in bamboo polyphenols in bamboo white frost can form hydrogen bonds with the hydroxyl and hydroxyl oxide groups of rice husk powder. According to the structural advantages, among the fillers with the same mass fraction, the mechanical enhancement effect of bamboo powder is better than that of rice husk powder, but the mechanical enhancement effects of both are still lower than that of collagen in the system. Similarly, the hygroscopicity or liquid absorption capacity of the three also has the same enhancement intensity, from large to small in turn: collagen > bamboo powder > rice husk powder.

[0060] Furthermore, collagen is composed of left-handed helical α polypeptide chains, and these chains twist by themselves and axially to form a right-handed superhelix. It mainly contains proline, hydroxyproline, glycine, and hydroxylysine. Therefore, in the modified impregnating liquid system, with polyethylene glycol as the base and collagen as the framework, rice husk powder and bamboo powder can act as "tentacles" connected by hydrogen bonds, not only enhancing the activity of the system but also having good hygroscopic effects. The use of the modified impregnating liquid has a synergistic effect on the hygroscopicity and water absorption of wood pulp fibers and can further enhance the mechanical effect of the fibers.

[0061] Furthermore, the pH value of the skin is usually between 4 - 6.5, showing weak acidity. This acidic environment helps to protect the natural barrier of the skin and maintain the healthy state of the skin. For the working fluid, polyhexamethyleneguanidine hydrochloride has good antibacterial properties. The composite non-woven fabric is pre-wetted, and by using the combination of polyhexamethyleneguanidine hydrochloride and citric acid, the pH value of the working fluid is adjusted to make the non-woven fabric meet the usage requirements for the skin such as the face. However, as an organic weak acid, citric acid will affect the stability of the system. In order to adjust the solution stability, the method of adding a weak alkaline salt, benzalkonium chloride, is adopted to ensure the effective use and stability of the whole working fluid.

[0062] Examples 1 - 3

[0063] A printed wood pulp spunlace non-woven fabric, comprising a non-woven fabric base cloth; spunlace non-woven fabric layers are provided on both sides of the non-woven fabric base cloth, and the spunlace non-woven fabric layers are used to composite wood pulp fibers on both sides of the non-woven fabric base cloth layer by the spunlace method; a reinforcing layer, a water-absorbing layer, and a color-developing fiber layer are sequentially bonded to the spunlace non-woven fabric layer through a hot melt adhesive web; the wood pulp fibers of the spunlace non-woven fabric layer are modified pure natural wood pulp fibers; the reinforcing layer is a PET fiber layer; a printing layer is further provided on the side of the color-developing fiber layer away from the water-absorbing layer.

[0064] The material of the water-absorbing layer includes superabsorbent resin and fluff pulp, and the mass ratio of the two is 1:1. Further, the color-developing fiber material is polyacrylonitrile-based diethylenetriamine, which can play the role of indicating the cleaning degree by the color-developing factor, and does not affect the wiping effect in the wet state, and can completely remove the residual moisture on the face.

[0065] Further, the modified natural wood pulp fiber is obtained by natural drying after two-dipping and two-rolling of the natural wood pulp fiber with a modified dipping solution, wherein the dipping and rolling bath ratio is 1:20.

[0066] Further, by weight, the modified dipping solution includes the following raw material components:

[0067] Polyethylene glycol 45 - 55 parts;

[0068] Collagen 10 - 15 parts;

[0069] Rice husk powder 1 - 5 parts;

[0070] Bamboo powder 1 - 5 parts;

[0071] The balance is pure water.

[0072] Further, the particle size of the rice husk powder and the bamboo powder is 100 - 200 nm. Preferably, the mass ratio of the rice husk powder to the bamboo powder is 1:1.

[0073] Further, the molecular weight of the polyethylene glycol is 1000 - 6000.

[0074] Further, the preparation method of the printed wood pulp spunlace non-woven fabric includes the following steps:

[0075] Step S1, preparing materials

[0076] Prepare the modified dipping solution and treat the natural wood pulp fiber to obtain the modified natural wood pulp fiber;

[0077] Step S2, web laying and spunlacing

[0078] Carry out the steps of opening, carding, mixing, web forming, spunlacing reinforcement, drying and slitting on the modified natural wood pulp fiber to form a sandwich-type non-woven fabric, that is, a non-woven fabric base cloth with spunlace non-woven fabric layers on both sides;

[0079] Step S3, non-woven fabric compounding

[0080] Prepare PET fibers, lay them out, and bond them into a web with hot melt adhesive to form a PET fiber reinforcement layer with a cross-network structure in the horizontal direction. Then, bond a sandwich non-woven fabric to the PET fiber reinforcement layer to form a multi-layer non-woven fabric with a reinforcement layer. Similarly, bond a sandwich non-woven fabric to the other side of the PET fiber to form a reinforcement layer. Then, form a water-absorbing layer and a color-developing fiber layer on the reinforcement layer in the same way to form a composite non-woven fabric.

[0081] Step S4, Wetting treatment

[0082] Prepare a working solution, and pre-wet the composite non-woven fabric obtained in step S3 so that the moisture content of the non-woven fabric is more than 50% to obtain a wetted non-woven fabric.

[0083] Step S5, Coloring treatment

[0084] Prepare a uniformly dispersed coloring masterbatch with nano-ecological dyes, and dip-roll the treated wetted non-woven fabric in the coloring masterbatch, where the temperature of the coloring masterbatch is 70°C - 85°C.

[0085] Step S6, Post-treatment and packaging

[0086] Dry and rehumidify the dip-rolled non-woven fabric, and then perform printing treatment on the surface of the non-woven fabric to obtain a printed wood pulp spunlace non-woven fabric. Then, after sampling the prepared printed wood pulp spunlace non-woven fabric and conducting various tests, package the finished product.

[0087] Furthermore, the working solution described in step S4, by weight, includes the following raw material components:

[0088] Polyhexamethylene guanidine hydrochloride 7 - 13 parts;

[0089] Benzalkonium chloride 5 - 7 parts;

[0090] Phenoxyethanol 4 - 6 parts;

[0091] Ethylhexylglycerin 2 - 4 parts;

[0092] Dipropylene glycol 7 - 9 parts;

[0093] Propylene glycol 3 - 5 parts;

[0094] Citric acid 0.5 - 1.5 parts;

[0095] The balance is pure water.

[0096] Furthermore, during the spunlace process described in step S2, the wood pulp fiber web is spunlaced from the front or the back by a spunlace machine.

[0097] Further, the coloring masterbatch described in step S5 is prepared by dispersing nano-ecological dyes through microwave oscillation. The pH value of the coloring masterbatch is controlled to be 5.0 - 6.8, and the concentration is 0.1% - 2%. Moreover, the padding duration of the coloring masterbatch is greater than 15 seconds, and two - time padding is adopted.

[0098] Further, the water content of the printed pulp spunlace non - woven fabric after step S6 is 5% - 8%. Among them, the material usage ratio tables of Examples 1 - 3 are shown in Table 1.

[0099] Comparative Examples 1 - 6

[0100] Different from Example 1, the components shown in Table 1 are weighed by weight percentage, and other preparation processes refer to Example 1.

[0101] Table 1 Material usage ratio table

[0102] The non - woven fabrics prepared in Examples 1 - 3 and Comparative Examples 1 - 6 are tested with standard samples, and performance tests are carried out according to relevant test standards.

[0103] Performance test

[0104] Tensile strength test

[0105] The tensile strength of the non - woven fabric includes two aspects: longitudinal and transverse. The tensile strength test is carried out according to the detection method specified in GB / T 24218.3. And comparison and judgment are carried out according to the industry standard Q / 0100SQH 107 - 2023 "Wood pulp composite spunlace non - woven fabric".

[0106] Color fastness to rubbing

[0107] The color fastness to rubbing performance of the non - woven fabric is tested according to the standard GB / T 3920 - 2024 "Textiles - Tests for color fastness - Color fastness to rubbing".

[0108] Liquid absorption capacity

[0109] The liquid absorption capacity of the product is determined according to the detection method specified in GB / T 24218.6.

[0110] pH value

[0111] The pH value of the product is determined according to the detection method specified in GB / T 7573.

[0112] Appearance quality inspection

[0113] The appearance quality of the non-woven fabric is mainly detected by visual inspection, observing the linear defect points (water needle marks) on the fabric, and the grades are: slight, relatively significant, and significant. The evaluation criteria for each grade are as follows:

[0114] Slight linear defects refer to linear defects with ≤ 5 pieces / meter and a width less than 2.0 mm;

[0115] Relatively significant linear defects refer to linear defects with ≤ 2 pieces / meter (interval ≥ 1 meter) and a width between 2.0 - 3.0 mm;

[0116] Significant linear defects refer to linear defects with a width greater than 3.0 mm.

[0117] According to the above, the non-woven fabrics prepared in Examples 1 - 3 and Comparative Examples 1 - 6 were tested with standard samples, and performance tests were carried out in accordance with relevant test standards.

[0118] Table 2 Comparison table of performance test standards and results

[0119] From the analysis of the comparison results in Table 1 to Table 2 above, the present invention provides a non-woven fabric material that is both environmentally friendly and has high performance, meeting the needs of the modern market for high-quality non-woven fabric products. The design of the color-developing fiber layer of the present invention can achieve the function of indicating the cleaning degree by the color-developing factor, and does not affect the wiping effect even in a wet state; the water-absorbing layer can quickly absorb water after the non-woven fabric contacts the skin; the reinforcing layer is designed in the middle of the whole structure, having a good supporting structure function, and its fiber strength can enhance the overall mechanical practical effect; the spunlace non-woven fabric layer is designed with modified wood pulp fibers, and using the elasticity, firmness and moisturizing effect of collagen, it can further absorb water and maintain the overall shape. The rice husk powder and bamboo powder are essentially lignin fibers, which not only have good moisture absorption, but also have the advantages of environmental friendliness and biodegradability. The spunlace non-woven fabric of the present invention also adopts the impregnation process of the working fluid with polyhexamethylene guanidine hydrochloride as the main body, having good antibacterial properties and better meeting the usage requirements of consumers. The spunlace non-woven fabric of the present invention also forms an environmentally friendly printed surface through hot pressing by a printing machine, and through the hot pressing process, staggered concave and convex patterns can also be formed. The concave and convex pattern design increases the contact area with the user's face and improves the water absorption efficiency after wiping.

[0120] The non-woven fabric of the present invention has the characteristics of fluffiness and softness, providing a better hand feeling and skin-friendly feeling. The wood pulp fibers used as reinforcing materials, combined with polyester fibers, can maintain the strength and water absorbency of the product while reducing costs. This non-woven fabric wet wipe has stronger cleaning ability and is suitable for various cleaning occasions. The use of wood pulp fibers also increases the degradability of the product, meeting the current environmental protection trend.

[0121] In addition, the samples of Example 1 were subjected to skin irritation tests and toxicity tests. The fabric is directly in contact with the skin. The skin irritation tests and toxicity tests include in vitro cytotoxicity tests, skin irritation tests (single contact tests), and skin sensitization tests (guinea pig maximum dose tests), which were tested in accordance with GB / T 16886.5-2017 and GB / T 16886.10-2017, and the test results were judged in accordance with the standard technical requirements. Further, in order to detect the dye toxicity of the fabric, in accordance with the two standards of GB / T 18885-2020 "Technical Requirements for Eco-Friendly Textiles" and IS014184-1:2011, the fabric was tested and identified for the presence of toxic dyes. The relevant test and identification results are shown in Table 3:

[0122] Table 3 Skin Irritation Test and Toxicity Test Results

[0123] At the same time, for the non-woven fabric prepared in Example 1, in the two tests of skin irritation test (single contact test) and skin sensitization test (guinea pig maximum dose test), in accordance with the requirements of the single contact test in the animal irritation test recommended in GB / T 16886.10-2017 "Biological Evaluation of Medical Devices - Part 10: Irritation and Skin Sensitization Tests", the potential of the sample to cause skin irritation reactions in 0.9% sodium chloride injection and sesame oil extract was evaluated:

[0124] The test samples were prepared into extracts with extraction media. Three healthy, newly adult albino rabbits were selected for each. The hair on both sides of the animal's back spine about 10 cm * 15 cm was removed 24 h before the test. 0.5 mL of each of the sample extract and the extraction medium was dropped onto a gauze piece of 2.5 cm * 2.5 cm in size, and applied to both sides of the animal's back, and the patch was fixed with a bandage for at least 4 h. After the contact period ended, the patch was removed, the contact area was marked with permanent ink, and the skin of the contact area was washed with warm water to remove the remaining test materials, and carefully dried. The conditions of each contact area were recorded at 1 h, 24 h, 48 h, and 72 h after the patch was removed.

[0125] After testing, the primary irritation index (PI) of the extraction solution of the test sample in 0.9% sodium chloride injection was 0.00, and the primary irritation index (PI) of the extraction solution in sesame oil was 0.00. This indicates that: under the test conditions, the extraction solutions of the test sample in 0.9% sodium chloride injection and sesame oil showed extremely mild skin irritation reactions in rabbits. It is proved that the spunlace non-woven fabric prepared by the present invention is non-irritating to the skin.

[0126] Combined with the above tests, the non-woven fabric prepared by the present invention has excellent water absorption and strength, and has been significantly improved in performance. It is suitable for use in cleaning and personal care products, and is of great significance for manufacturing wet wipes with different characteristics and uses.

[0127] Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Those with ordinary knowledge in the technical field to which the present invention pertains can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to what is defined by the claims.

Claims

1. A printed wood pulp spunlace nonwoven fabric, comprising a nonwoven fabric base cloth (1), characterized in that: Spunlace nonwoven fabric layers (2) are provided on both sides of the nonwoven fabric base cloth (1), and the spunlace nonwoven fabric layers (2) are used to compound wood pulp fibers on both sides of the nonwoven fabric base cloth layer (1) by the spunlace method; A reinforcing layer (3), a water-absorbing layer (4) and a color-developing fiber layer (5) are sequentially bonded to the spunlace nonwoven fabric layer (2) through a hot melt adhesive web; The wood pulp fibers of the spunlace nonwoven fabric layer (2) are modified natural wood pulp fibers; The reinforcing layer (3) is a PET fiber layer; A printing layer is further provided on one side of the color-developing fiber layer (5) away from the water-absorbing layer (4).

2. The spunlace non-woven fabric made of printed wood pulp according to claim 1, wherein, The modified natural wood pulp fibers are formed by naturally drying the natural wood pulp fibers after being impregnated and double-rolled with a modified impregnating solution, wherein the impregnation and rolling bath ratio is 1:

20.

3. The spunlace nonwoven fabric made of printed wood pulp according to claim 2, wherein By weight, the modified impregnating solution comprises the following raw material components: 45-55 parts of polyethylene glycol; 10-15 parts of collagen; 1-5 parts of rice husk powder; 1-5 parts of bamboo powder; The balance is pure water.

4. The spunlace non-woven fabric made of printed wood pulp according to claim 3, characterized in that, The particle size of the rice husk powder and the bamboo powder is 100-200 nm.

5. The spunlace nonwoven fabric made of printed wood pulp according to claim 3, characterized in that The molecular weight of the polyethylene glycol is 1000-6000.

6. A method for preparing the printed wood pulp spunlace nonwoven fabric according to any one of claims 1-5, characterized in that, It includes the following steps: Step S1, material preparation Prepare a modified impregnating solution and treat natural wood pulp fibers to obtain modified natural wood pulp fibers; Step S2, web laying and spunlacing Carry out steps of loosening, carding, mixing, web forming, spunlace reinforcement, drying and slitting on the modified natural wood pulp fibers to form a sandwich-type nonwoven fabric, that is, a nonwoven fabric base cloth with spunlace nonwoven fabric layers on both sides; Step S3, nonwoven fabric compounding Prepare PET fibers, lay them into a web, and bond them with hot melt adhesive to form a network to form a PET fiber reinforcing layer with a cross-network structure in the horizontal direction. Then, laminate the sandwich-type nonwoven fabric onto the PET fiber reinforcing layer to form a multi-layer structure nonwoven fabric with a reinforcing layer; similarly, the other side of the sandwich-type nonwoven fabric is also laminated with PET fibers to form a reinforcing layer; and then, an absorbent layer and a color-developing fiber layer are sequentially formed on the reinforcing layer in the same way to form a composite nonwoven fabric; Step S4, wetting treatment Prepare a working solution, and carry out pre-wetting treatment on the composite nonwoven fabric in step S3 so that the moisture content of the nonwoven fabric is more than 50% to obtain a wetted nonwoven fabric; Step S5, coloring treatment Configure nano-ecological dyes into a uniformly dispersed coloring mother liquor, and immerse and roll the treated wetted nonwoven fabric in the coloring mother liquor, wherein the temperature of the coloring mother liquor is 70°C - 85°C; Step S6, post-treatment and packaging Carry out drying treatment and moisture regain on the immersed and rolled nonwoven fabric, and then carry out printing treatment on the surface of the nonwoven fabric to obtain a printed wood pulp spunlace nonwoven fabric; then, after sampling the prepared printed wood pulp spunlace nonwoven fabric and performing various tests, package the finished product.

7. The preparation method of a printed wood pulp spunlace non-woven fabric according to claim 6, characterized in that, The working solution in step S4, by weight, consists of the following raw material components: 7-13 parts of polyhexamethylene guanidine hydrochloride; 5-7 parts of benzalkonium chloride; 4-6 parts of phenoxyethanol; 2-4 parts of ethylhexylglycerin; 7-9 parts of dipropylene glycol; 3-5 parts of propylene glycol; 0.5-1.5 parts of citric acid; The balance is pure water.

8. The preparation method of a printed wood pulp spunlace nonwoven fabric according to claim 6, characterized in that, During the hydroentangling process described in step S2, the wood pulp fiber web is hydroentangled on the front or back side by a hydroentangling machine.

9. The preparation method of a printed wood pulp spunlace non-woven fabric according to claim 6, characterized in that, The color masterbatch described in step S5 is prepared by microwave oscillation dispersion of nano-ecological dyes. The pH value of the color masterbatch is controlled to be 5.0 - 6.8, and the concentration is 0.1% - 2%. Moreover, the padding time of the color masterbatch is greater than 15 seconds, and two padding operations are adopted.

10. The preparation method of a printed wood pulp spunlace nonwoven fabric according to claim 6, characterized in that, The moisture content of the printed wood pulp hydroentangled non-woven fabric after step S6 is 5% - 8%.

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