Non-woven fabric coloring method

Abstract

The invention relates to the technical field of non-woven fabric coloring, in particular to a non-woven fabric coloring method which comprises the following steps: step 1, pre-treating non-woven fabric to enhance binding force; 2, coloring by combining an electrospinning method with a concave-convex structure; step 3, spraying step by step; 4, directional texture design and concave-convex mold auxiliary forming are carried out; and 5, environment-friendly low-temperature curing and follow-up treatment are conducted. The non-woven fabric is pretreated through plasma surface activation and ultrasonic alternate cleaning to enhance the binding force, and through nanofiber composite spraying, a mixed solution of a high-molecular compound and a coloring agent is sprayed through an electrospinning method, and a fiber layer with a concave-convex shape is formed on the surface of a collecting device; finally, a low-temperature curing technology is adopted, heating at the temperature of 40-60 DEG C or air drying at the room temperature is adopted, energy consumption is reduced, non-chemical structural colors are used for replacing, traditional acidic and disperse dyes are completely abandoned, colors are generated through physical arrangement of colloidal microspheres, waste water pollution is avoided, and therefore the method is good in process effect and high in environmental friendliness.

Description

Technical Field

[0001] The invention relates to the technical field of non-woven fabric coloring, in particular to a non-woven fabric coloring method. Background Art

[0002] The color of nonwoven fabrics depends primarily on the intended use and functional requirements. Common colors include: white: the mainstream choice for medical supplies (surgical gowns, masks) and cleaning products; black: used for photography backgrounds, stage curtains, and other scenes requiring light shielding; blue: a signature color in the medical field (such as surgical gowns); and pink / red: used for feminine hygiene products and celebration decorations, embodying a soft and welcoming atmosphere, respectively. Nonwoven fabrics of various colors are produced through a dyeing process.

[0003] Traditional non-woven fabric coloring requires repeated dyeing with chemical dyes, and subsequent processing requires hot water washing and cold washing, which easily causes water pollution and is less environmentally friendly. Summary of the Invention

[0004] (1) Technical problems solved

[0005] In view of the shortcomings of the existing technology, the present invention provides a non-woven fabric coloring method, which has the advantages of good process effect and high environmental protection, and solves the above problems.

[0006] (2) Technical solution

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A nonwoven fabric coloring method comprises the following steps:

[0009] Step 1: Pre-treat the non-woven fabric to enhance the bonding strength;

[0010] Step 2: electrospinning combined with concave-convex structure coloring;

[0011] Step 3: spraying in steps;

[0012] Step 4: Directional texture design and concave-convex mold-assisted molding;

[0013] Step 5: Environmentally friendly low-temperature curing and subsequent processing.

[0014] Preferably, the step 1 comprises plasma surface activation and ultrasonic alternating cleaning.

[0015] Preferably, the step 2 includes nanofiber composite spraying: spraying a mixture of a polymer compound (such as polyacrylate) and a colorant by electrospinning to form a fiber layer with a concave-convex shape on the surface of the collecting device, and using the light interference effect to generate structural color to avoid traditional dye pollution.

[0016] Preferably, the three-step spraying step includes: first spraying of the bonding layer, spraying of the microsphere assembly liquid, and secondary curing spraying.

[0017] Preferably, in step four, the concave-convex mold assists in molding: inverted frustum or triangular pyramidal grooves are preset on the surface of the collecting device so that a specific texture is formed when the nanofibers are deposited, and color stratification is achieved through the difference in L values ​​between the convex and concave parts to simulate the natural skin texture effect.

[0018] Preferably, the low-temperature curing technology used in step five is: heating at 40-60°C or air drying at room temperature to reduce energy consumption while retaining the breathability of the non-woven fabric; non-chemical structural color replacement: completely abandoning traditional acid and disperse dyes, and generating color through the physical arrangement of colloidal microspheres to avoid wastewater pollution.

[0019] (3) Beneficial effects

[0020] Compared with the prior art, the present invention provides a non-woven fabric coloring method, which has the following beneficial effects:

[0021] 1. The present invention pre-treats the non-woven fabric through plasma surface activation and ultrasonic alternating cleaning to enhance the bonding strength, and uses nanofiber composite spraying: a mixed liquid of a polymer compound and a colorant is sprayed by electrospinning to form a fiber layer with a concave-convex shape on the surface of the collecting device, and the light interference effect is used to generate structural color to avoid traditional dye pollution. Then, the adhesive layer is sprayed for the first time, the microsphere assembly liquid is sprayed, and the secondary curing spray is applied. Finally, the low-temperature curing technology is adopted: heating at 40-60°C or air-drying at room temperature is used to reduce energy consumption while retaining the air permeability of the non-woven fabric. Non-chemical structural color replacement: traditional acid and disperse dyes are completely abandoned, and color is generated by the physical arrangement of colloidal microspheres to avoid wastewater pollution. Therefore, this method has good process effect and high environmental protection.

[0022] 2. The present invention adopts directional texture design and concave-convex mold-assisted molding, and presets inverted frustum or triangular pyramid grooves on the surface of the collection device, so that the nanofibers form a specific texture when deposited. The color stratification is achieved by the difference in L value between the convex and concave parts, simulating the natural skin texture effect. DETAILED DESCRIPTION

[0023] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0024] The present invention relates to a method for coloring nonwoven fabrics, comprising the following steps:

[0025] Step 1: Pre-treat the non-woven fabric to enhance bonding strength, including plasma surface activation and ultrasonic alternating cleaning;

[0026] Step 2: Electrospinning combined with concave-convex structure coloring, including nanofiber composite spraying: A mixture of a polymer compound (such as polyacrylate) and a colorant is sprayed through electrospinning to form a fiber layer with a concave-convex shape on the surface of the collection device. The optical interference effect is used to generate structural color, avoiding contamination from traditional dyes.

[0027] Step 3: spraying in steps, including: first spraying of bonding layer, spraying of microsphere assembly liquid and secondary curing spraying;

[0028] Step 4: Directional texture design and concave-convex mold-assisted molding;

[0029] Step 4: Concave-convex mold-assisted molding: Preset inverted frustum or triangular pyramid grooves on the surface of the collection device to form a specific texture when the nanofibers are deposited. The color stratification is achieved by the difference in L value between the convex and concave parts, simulating the texture effect of natural skin;

[0030] Step 5: Environmentally friendly low-temperature curing and subsequent processing. The low-temperature curing technology used: heating at 40-60℃ or air drying at room temperature to reduce energy consumption while retaining the breathability of the non-woven fabric. Non-chemical structural color replacement: completely abandoning traditional acid and disperse dyes, and producing color through the physical arrangement of colloidal microspheres to avoid wastewater pollution.

[0031] The beneficial effects of the present invention are: the present invention pre-treats the non-woven fabric through plasma surface activation and ultrasonic alternating cleaning to enhance the bonding strength, and through nanofiber composite spraying: a mixed liquid of a polymer compound and a colorant is sprayed by electrospinning to form a fiber layer with a concave-convex shape on the surface of the collecting device, and structural color is generated by utilizing the light interference effect to avoid traditional dye pollution, and then through the initial spraying of the bonding layer, microsphere assembly liquid spraying and secondary curing spraying, and finally the low-temperature curing technology used: heating at 40-60°C or air drying at room temperature to reduce energy consumption while retaining the air permeability of the non-woven fabric, non-chemical structural color replacement: completely abandoning traditional acid and disperse dyes, generating color through the physical arrangement of colloidal microspheres to avoid wastewater pollution.

[0032] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for coloring a nonwoven fabric, characterized in that: The following steps are involved: Step 1: Pre-treat the non-woven fabric to enhance the bonding strength; Step 2: electrospinning combined with concave-convex structure coloring; Step 3: spraying in steps; Step 4: Directional texture design and concave-convex mold-assisted molding; Step 5: Environmentally friendly low-temperature curing and subsequent processing.

2. The method for coloring a nonwoven fabric according to claim 1, wherein: The first step includes plasma surface activation and ultrasonic alternating cleaning.

3. The method for coloring a nonwoven fabric according to claim 1, wherein: The second step includes nanofiber composite spraying: spraying a mixture of a polymer compound and a colorant by electrospinning to form a fiber layer with a concave-convex shape on the surface of the collecting device.

4. The method for coloring a nonwoven fabric according to claim 1, wherein: The three-step spraying process includes: first spraying of the bonding layer, spraying of the microsphere assembly liquid, and secondary curing spraying.

5. The method for coloring a nonwoven fabric according to claim 1, wherein: The fourth step is to use a concave-convex mold to assist in the forming process: inverted frustum or triangular pyramid grooves are preset on the surface of the collecting device so that a specific texture is formed when the nanofibers are deposited.

6. The method for coloring a nonwoven fabric according to claim 1, wherein: The low-temperature curing technology used in the step 5 is to heat at 40-60°C or air-dry at room temperature to reduce energy consumption while retaining the air permeability of the non-woven fabric.