Dyeing process of non-woven fabric

Abstract

The invention relates to the technical field of non-woven fabric processing, and discloses a non-woven fabric dyeing process which comprises the following steps: step 1, pretreatment; the method comprises the following steps: (1) solution preparation: preparing an aqueous solution containing a surfactant and a penetrant, selecting fatty alcohol-polyoxyethylene ether as the surfactant and controlling the mass concentration at 0.5%-1%, and adopting JFC as the penetrant and controlling the mass concentration at 0.2%-0.5%; and (2) soaking treatment: completely soaking the non-woven fabric into the solution, keeping the soaking temperature at 30-40 DEG C, and setting the soaking time to be 15-25 minutes. According to the dyeing process of the non-woven fabric, a specific surfactant and a penetrating agent are used in the pretreatment step, reactive dye and a proper amount of dyeing assistant are adopted in the dyeing process, dyeing is carried out under the conditions of proper temperature, pH value and time, a cationic color fixing agent is selected in the color fixing step, and the cationic color fixing agent can chemically react with the dye to form stable chemical bonds; therefore, the effects of ensuring uniform dyeing and color brightness of the non-woven fabric and reducing the cost can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of non-woven fabric processing, in particular to a dyeing process for non-woven fabric. Background Art

[0002] Non-woven fabrics have the advantages of low cost, high production efficiency and wide range of uses. They have been widely used in packaging, clothing, sanitary products and other fields. Dyeing is an important link in the non-woven fabric processing process. Through dyeing, non-woven fabrics can be given a variety of bright colors to meet the needs of different users.

[0003] However, traditional dyeing methods often make it difficult for dyes to penetrate evenly into non-woven fabrics, resulting in uneven dyeing, poor color vividness and fastness. Moreover, some dyeing processes require the use of large amounts of water and chemical additives, which not only increases production costs but also causes significant pollution to the environment. Summary of the Invention

[0004] (1) Technical problems solved

[0005] In view of the shortcomings of the existing technology, the present invention provides a dyeing process for non-woven fabrics, which has the advantages of ensuring uniform dyeing of non-woven fabrics, bright colors and reducing costs, and solves the problems mentioned in the above background technology.

[0006] (2) Technical solution

[0007] To achieve the above object, the present invention provides the following technical solution: a dyeing process for non-woven fabrics, comprising the following steps:

[0008] Step 1: Preprocessing;

[0009] ① Solution preparation: prepare an aqueous solution containing a surfactant and a penetrant. The surfactant is fatty alcohol polyoxyethylene ether, and the mass concentration must be controlled at 0.5%-1%. The penetrant is JFC, and the mass concentration is 0.2%-0.5%;

[0010] ② Soaking treatment: completely immerse the non-woven fabric in the above solution, keep the soaking temperature at 30-40℃, and set the soaking time to 15-25 minutes;

[0011] ③ Rinse and dry: After soaking, take out the non-woven fabric and rinse it thoroughly with clean water to remove the residual solution on the surface. Then, place the non-woven fabric in an oven at 60-70℃ and dry it to constant weight.

[0012] Step 2: dyeing;

[0013] ① Dye solution preparation: The dye solution consists of dye, dyeing auxiliary and water. The dye is selected as reactive dye and the dyeing auxiliary is sodium sulfate. The concentration of sodium sulfate is controlled at 5%-10%. At the same time, the pH value of the dye solution is adjusted to 6-7 by acetic acid and sodium hydroxide.

[0014] ② Dyeing operation: put the pretreated non-woven fabric into the dye solution, maintain the dyeing temperature at 70-80℃, and dye for 30-40 minutes;

[0015] Step 3: Fixing color;

[0016] ① Fixing solution preparation: prepare an aqueous solution containing a cationic fixing agent with a mass concentration of 2%-3%;

[0017] ② Fixation treatment: After dyeing, take the non-woven fabric out of the dye solution and put it into the fixing solution. The fixing temperature is controlled at 50-60℃ and the fixing time is 15-20 minutes.

[0018] ③ Rinse: After the color fixation is completed, take out the non-woven fabric and rinse it with clean water to remove the residual color fixative on the surface;

[0019] Step 4: Post-processing;

[0020] ① Preparation of softener solution: prepare a solution containing silicone softener with a mass concentration of 1%-2%;

[0021] ② Soaking treatment: soak the fixed non-woven fabric in softener solution for 10-15 minutes;

[0022] ③ Drying: After soaking, take out the non-woven fabric and place it in an oven at 80-90℃ to dry it, and finally obtain a dyed non-woven fabric product with excellent performance;

[0023] Step 5: Pre-dyeing and activation: soak the pretreated and dried non-woven fabric in a solution containing an activator for 5-10 minutes. The activator is a mixed solution of disodium ethylenediaminetetraacetic acid (EDTA-2Na) and triethanolamine, with mass concentrations of 0.2%-0.3% and 0.1%-0.2% respectively.

[0024] Preferably, the pretreatment step adds nano-scale titanium dioxide particles to the original surfactant fatty alcohol polyoxyethylene ether and penetrant JFC, introduces ultrasonic treatment during the soaking process, and the rinsed non-woven fabric is vacuum dried. Before soaking in the solution, the non-woven fabric is pretreated with low-temperature plasma. After the low-temperature plasma pretreatment, the non-woven fabric is immersed in a solution containing cellulase. After the enzyme treatment, the non-woven fabric is placed in a solution containing a swelling agent.

[0025] Preferably, the dyeing step uses microencapsulated reactive dyes. During the dyeing process, in addition to traditional mechanical stirring, an electromagnetic stirring device is added, and microwave radiation is used. A spectral sensor is installed in the dyeing equipment to monitor the dye solution concentration and the color change of the non-woven fabric in real time. An electric field is set in the dyeing device, the electrodes are made of stainless steel, and the applied electric field strength is 10-20 V / cm. A nanobubble generating device is introduced into the dye solution, and the diameter of the generated nanobubbles is 50-200 nm. A certain proportion of natural biological dyes, such as curcumin, anthocyanin, etc., are compounded in the reactive dye.

[0026] Preferably, in addition to the cationic color fixing agent, a water-based polyurethane color fixing agent is added to the color fixing step. Before color fixing, the dyed non-woven fabric is subjected to low-temperature plasma treatment. During the color fixing process, the color fixing liquid is circulated through a filter device and an ion exchange resin column. After the color fixing is completed, the non-woven fabric is subjected to ultraviolet irradiation treatment. The ultraviolet wavelength is selected to be 254nm and the irradiation intensity is 5-10mW / cm 2 The irradiation time is 5-8 minutes, and an appropriate amount of cross-linking agent, such as glutaraldehyde, is added to the fixing solution. Nano-silica particles with a particle size of 30-80 nm are added to the fixing solution, and the addition amount is 0.1-0.3 g per 1000 ml of fixing solution.

[0027] Preferably, the post-processing step adds nanosilver particles to the silicone softener solution. Nanosilver has antibacterial properties and can give the non-woven fabric an antibacterial function. During the post-processing process, a layer of ultraviolet protection coating is added. The drying step adopts supercritical carbon dioxide drying technology. After supercritical carbon dioxide drying, the non-woven fabric is sprayed with a green and environmentally friendly finishing agent. The finishing agent is made from plant extracts, such as tea polyphenols and aloe extract. For non-woven fabrics for specific purposes, shape memory finishing is performed in the post-processing. A shape memory polymer finishing agent is applied to the non-woven fabric by padding or coating. After supercritical carbon dioxide drying, the non-woven fabric is waterproof and breathable. A finishing liquid compounded with a fluorine-containing waterproofing agent and a silicone breathable agent is used to treat the non-woven fabric by an impregnation method.

[0028] Preferably, the pre-dyeing activation step is added between the pretreatment and dyeing steps, and the pre-dyeing activation step is added, and the non-woven fabric that has been pretreated and dried is placed in a solution containing an activator and soaked for 5-10 minutes. The activator is a mixed solution of disodium ethylenediaminetetraacetic acid (EDTA-2Na) and triethanolamine, with mass concentrations of 0.2%-0.3% and 0.1%-0.2% respectively.

[0029] Compared with the prior art, the present invention provides a non-woven fabric dyeing process with the following beneficial effects:

[0030] The dyeing process of the non-woven fabric uses specific surfactants and penetrants in the pretreatment step, and adopts reactive dyes and appropriate amounts of dyeing auxiliaries in the dyeing process, and dyeing is carried out under suitable temperature, pH value and time conditions. The cationic fixing agent is selected in the fixation step, which can react chemically with the dye to form a stable chemical bond, thereby ensuring the uniform dyeing of the non-woven fabric, bright colors and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the process flow of the present invention. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0033] See also Figure 1 , a dyeing process for non-woven fabrics, comprising the following steps:

[0034] Step 1: Preprocessing;

[0035] ① Solution preparation: prepare an aqueous solution containing a surfactant and a penetrant. The surfactant is fatty alcohol polyoxyethylene ether, and the mass concentration must be controlled at 0.5%-1%. The penetrant is JFC, and the mass concentration is 0.2%-0.5%;

[0036] ② Soaking treatment: Immerse the non-woven fabric completely in the above solution, maintain the soaking temperature at 30-40°C, and set the soaking time to 15-25 minutes. During this process, the surfactant and penetrant in the solution will reduce the surface tension of the non-woven fabric fiber, enhance the hydrophilicity of the fiber, and prepare for subsequent dye penetration;

[0037] ③ Rinse and dry: After soaking, take out the non-woven fabric and rinse it thoroughly with clean water to remove the residual solution on the surface. Then, place the non-woven fabric in an oven at 60-70℃ and dry it to constant weight to ensure that the moisture content of the non-woven fabric is stable, which is convenient for subsequent dyeing operations;

[0038] Step 2: dyeing;

[0039] ① Dye solution preparation: The dye solution consists of dye, dyeing auxiliary and water. The dye is selected as reactive dye and the dyeing auxiliary is sodium sulfate. The concentration of sodium sulfate is controlled at 5%-10%. At the same time, the pH value of the dye solution is adjusted to 6-7 by acetic acid and sodium hydroxide.

[0040] ② Dyeing operation: put the pretreated non-woven fabric into the dye solution, maintain the dyeing temperature at 70-80℃, and dye for 30-40 minutes. During the dyeing process, the dye solution must be stirred continuously to ensure that the non-woven fabric is in full contact with the dye solution, ensuring that the dye evenly penetrates into the non-woven fabric, thereby achieving a good dyeing effect;

[0041] Step 3: Fixing color;

[0042] ① Fixing solution preparation: prepare an aqueous solution containing a cationic fixing agent with a mass concentration of 2%-3%;

[0043] ② Fixation treatment: After dyeing, take the non-woven fabric out of the dye solution and put it into the fixing solution. The fixing temperature is controlled at 50-60℃ and the fixing time is 15-20 minutes. During this process, the cationic fixing agent will react chemically with the dye to form a stable chemical bond, thereby improving the color fastness and preventing fading in subsequent use.

[0044] ③ Rinse: After the color fixation is completed, take out the non-woven fabric and rinse it with clean water to remove the residual color fixative on the surface;

[0045] Step 4: Post-processing;

[0046] ① Preparation of softener solution: prepare a solution containing silicone softener with a mass concentration of 1%-2%;

[0047] ② Soaking treatment: Soak the non-woven fabric after color fixing in softener solution for 10-15 minutes. The silicone softener will form a protective film on the surface of the non-woven fabric fiber, improving the softness of the non-woven fabric and its physical properties.

[0048] ③ Drying: After soaking, take out the non-woven fabric and place it in an oven at 80-90℃ to dry it, and finally obtain a dyed non-woven fabric product with excellent performance;

[0049] Step 5: Pre-dyeing activation: soak the pretreated and dried non-woven fabric in a solution containing an activator for 5-10 minutes. The activator is a mixed solution of disodium ethylenediaminetetraacetic acid (EDTA-2Na) and triethanolamine with mass concentrations of 0.2%-0.3% and 0.1%-0.2% respectively. This solution can further remove impurities such as metal ions on the fiber surface, while introducing more active sites on the fiber surface, enhancing the binding ability of the fiber and the dye, providing more favorable conditions for the dyeing process, and thus improving the dyeing effect.

[0050] The pretreatment step adds nano-scale titanium dioxide particles to the original surfactant fatty alcohol polyoxyethylene ether and penetrant JFC, introduces ultrasonic treatment during the soaking process, and the rinsed non-woven fabric is vacuum dried. Before soaking in the solution, the non-woven fabric is pretreated with low-temperature plasma. After the low-temperature plasma pretreatment, the non-woven fabric is immersed in a solution containing cellulase. After the enzyme treatment, the non-woven fabric is placed in a solution containing an expansion agent.

[0051] Through the above technical solution, the photocatalytic activity of nano-titanium dioxide can use light to decompose impurities on the surface of non-woven fabrics and improve the purity of dyeing. The optimized surfactant and penetrant concentration can better reduce the surface tension of the fiber and enhance the hydrophilicity, creating favorable conditions for dye penetration. Ultrasonic-assisted immersion accelerates the diffusion of surfactants and penetrants in the solution into the non-woven fibers, shortens the immersion time to 10-15 minutes, and strengthens the fiber surface modification effect, significantly improving the pretreatment efficiency and quality. Vacuum drying avoids fiber oxidation caused by traditional oven drying, accelerates the evaporation of water, and makes the non-woven fabric contain The water volume is uniform and stable, reducing the drying time by about 20% and ensuring product quality. Low-temperature plasma pretreatment etches the fiber surface, increasing the roughness and the contact area between the fiber and the subsequent treatment liquid, further improving the pretreatment effect and laying a good foundation for subsequent processes. Cellulase selectively hydrolyzes part of the cellulose on the fiber surface to form tiny pores, promoting the penetration of subsequent treatment liquids and dyes, while improving the feel of the non-woven fabric and enhancing the product texture. Polyethylene glycol (PEG) causes the fiber to swell moderately, increasing the gaps between the fibers, which is beneficial to the entry of subsequent treatment agents and dye molecules, improving the overall pretreatment effect, and enhancing the dyeing effect.

[0052] The dyeing step uses microencapsulated reactive dyes. During the dyeing process, in addition to traditional mechanical stirring, an electromagnetic stirring device is added. At the same time, microwave radiation is used. A spectral sensor is installed in the dyeing equipment to monitor the dye solution concentration and the color change of the non-woven fabric in real time. An electric field is set in the dyeing device. The electrodes are made of stainless steel. The applied electric field strength is 10-20V / cm. A nanobubble generating device is introduced into the dye solution. The diameter of the generated nanobubbles is 50-200nm. A certain proportion of natural biological dyes, such as curcumin and anthocyanin, are compounded in the reactive dye.

[0053] Through the above technical solution, as the temperature of the dye solution rises and is stirred, the microcapsules release the dye continuously and evenly, improving the utilization rate of the dye, reducing waste, and making the dyeing process more stable and controllable. Electromagnetic stirring causes the dye solution to produce uniform vortex flow, enhancing the contact between the dye and the non-woven fabric. Microwave radiation accelerates the movement of dye molecules and promotes their binding with the fiber. The synergistic effect shortens the dyeing time to 20-30 minutes, improving the dyeing uniformity and color fastness. Under the action of the electric field, the dye ions are accelerated to migrate and adsorb to the surface of the non-woven fabric fiber, significantly improving the dyeing rate and uniformity, while reducing the dye dosage by about 10%-15%. Nanobubbles carry a large number of gas molecules, and when they burst, they produce microjets and a local high temperature and high pressure environment, which promote the reaction between the dye molecules and the fiber, improving the dyeing efficiency and color fastness. The biological dye enriches the color variety, giving the non-woven fabric the advantages of environmental protection and good biocompatibility, so that the dyed non-woven fabric has both the unique color of natural dyes and the excellent performance of reactive dyes.

[0054] In the color fixing step, in addition to the cationic color fixing agent, a water-based polyurethane color fixing agent is added. Before color fixing, the dyed non-woven fabric is treated with low-temperature plasma. During the color fixing process, the color fixing liquid is circulated through a filter device and an ion exchange resin column. After the color fixing is completed, the non-woven fabric is irradiated with ultraviolet light. The ultraviolet wavelength is 254nm and the irradiation intensity is 5-10mW / cm 2 The irradiation time is 5-8 minutes, and an appropriate amount of cross-linking agent, such as glutaraldehyde, is added to the fixing solution. Nano-silica particles with a particle size of 30-80 nm are added to the fixing solution, and the addition amount is 0.1-0.3 g per 1000 ml of fixing solution.

[0055] Through the above technical solution, the cationic color fixing agent forms a chemical bond with the dye, and the water-based polyurethane color fixing agent forms a protective film on the fiber surface, which synergistically significantly improves the color fastness. More active groups are introduced on the fiber surface to enhance the binding force between the color fixing agent and the fiber, further improving the color fixing effect. The filter device and ion exchange resin column perform a cyclic treatment to filter out impurity particles and remove excess ions, so that the color fixing solution can be recycled multiple times, reducing the waste of color fixing agent and environmental pollution. Ultraviolet radiation triggers a cross-linking reaction between the color fixing agent and the fiber surface, further improving the color fastness, especially the water washing fastness. Glutaraldehyde undergoes a cross-linking reaction with the fiber and the color fixing agent molecules to form a more stable network structure, enhancing the color fixing effect. Silica ions fill the gaps between the fiber and the color fixing agent, enhancing the bonding strength between the color fixing agent and the fiber, and improving the wear resistance and friction color fastness of the non-woven fabric.

[0056] In the post-processing step, nanosilver particles are added to the silicone softener solution. Nanosilver has antibacterial properties and can give the non-woven fabric antibacterial function. In the post-processing process, a layer of ultraviolet protection coating is added, and the drying process adopts supercritical carbon dioxide drying technology. After supercritical carbon dioxide drying, the non-woven fabric is sprayed with a green and environmentally friendly finishing agent. The finishing agent is made of plant extracts, such as tea polyphenols and aloe extract. For non-woven fabrics for specific purposes, shape memory finishing is performed in the post-processing. A shape memory polymer finishing agent is applied to the non-woven fabric by dipping or coating. After supercritical carbon dioxide drying, the non-woven fabric is waterproof and breathable. A finishing liquid compounded with a fluorine-containing waterproofing agent and a silicone breathable agent is used to treat the non-woven fabric by an impregnation method.

[0057] Through the above technical solution, nano silver particles give non-woven fabrics antibacterial function and improve softness, making them suitable for medical, sanitary and other fields with high hygiene requirements. Non-woven fabrics are coated with water-based coatings containing nano zinc oxide and titanium dioxide. Nano zinc oxide and titanium dioxide effectively absorb and scatter ultraviolet rays, giving non-woven fabrics ultraviolet protection function. The coating thickness can be adjusted as needed. The non-woven fabrics after color fixation and other treatments are placed in a supercritical carbon dioxide environment to quickly take away moisture without affecting the structure and performance of the non-woven fabrics, maintaining good softness and fluffiness, drying quickly and efficiently. Spray treatment gives non-woven fabrics special functions such as antioxidant and skin soothing, and is environmentally friendly. Shape memory polymer finishing agent treatment gives non-woven fabrics shape memory function, which can return to the set shape when the external temperature changes, meeting the needs of smart clothing and other fields. Fluorine-containing waterproofing agents form a low surface energy layer to impart waterproof properties, and silicone breathable agents keep the pores between fibers unobstructed to ensure breathability.

[0058] A pre-dyeing activation step is added between the pretreatment and dyeing steps, wherein the pretreated and dried non-woven fabric is immersed in a solution containing an activator for 5-10 minutes. The activator is a mixed solution of disodium ethylenediaminetetraacetic acid (EDTA-2Na) and triethanolamine, with mass concentrations of 0.2%-0.3% and 0.1%-0.2%, respectively.

[0059] Through the above technical solution, impurities such as metal ions on the fiber surface are removed, more active sites are introduced, the binding ability of the fiber and dye is enhanced, the dyeing effect is improved, and the reintroduction of impurities is avoided.

[0060] 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 dyeing process for nonwoven fabrics, characterized in that: The following steps are involved: Step 1: Preprocessing; ① Solution preparation: prepare an aqueous solution containing a surfactant and a penetrant. The surfactant is fatty alcohol polyoxyethylene ether, and the mass concentration must be controlled at 0.5%-1%. The penetrant is JFC, and the mass concentration is 0.2%-0.5%; ② Soaking treatment: completely immerse the non-woven fabric in the above solution, keep the soaking temperature at 30-40℃, and set the soaking time to 15-25 minutes; ③ Rinse and dry: After soaking, take out the non-woven fabric and rinse it thoroughly with clean water to remove the residual solution on the surface. Then, place the non-woven fabric in an oven at 60-70℃ and dry it to constant weight. Step 2: dyeing; ① Dye solution preparation: The dye solution consists of dye, dyeing auxiliary and water. The dye is selected as reactive dye and the dyeing auxiliary is sodium sulfate. The concentration of sodium sulfate is controlled at 5%-10%. At the same time, the pH value of the dye solution is adjusted to 6-7 by acetic acid and sodium hydroxide. ② Dyeing operation: put the pretreated non-woven fabric into the dye solution, maintain the dyeing temperature at 70-80℃, and dye for 30-40 minutes; Step 3: Fixing color; ① Fixing solution preparation: prepare an aqueous solution containing a cationic fixing agent with a mass concentration of 2%-3%; ② Fixation treatment: After dyeing, take the non-woven fabric out of the dye solution and put it into the fixing solution. The fixing temperature is controlled at 50-60℃ and the fixing time is 15-20 minutes. ③ Rinse: After the color fixation is completed, take out the non-woven fabric and rinse it with clean water to remove the residual color fixative on the surface; Step 4: Post-processing; ① Preparation of softener solution: prepare a solution containing silicone softener with a mass concentration of 1%-2%; ② Soaking treatment: soak the fixed non-woven fabric in softener solution for 10-15 minutes; ③ Drying: After soaking, take out the non-woven fabric and place it in an oven at 80-90℃ to dry it, and finally obtain a dyed non-woven fabric product with excellent performance; Step 5: Pre-dyeing and activation: soak the pretreated and dried non-woven fabric in a solution containing an activator for 5-10 minutes. The activator is a mixed solution of disodium ethylenediaminetetraacetic acid (EDTA-2Na) and triethanolamine, with mass concentrations of 0.2%-0.3% and 0.1%-0.2% respectively.

2. The dyeing process for a nonwoven fabric according to claim 1, wherein: The pretreatment step adds nano-scale titanium dioxide particles to the original surfactant fatty alcohol polyoxyethylene ether and penetrant JFC, introduces ultrasonic treatment during the soaking process, and uses a vacuum drying method for the rinsed non-woven fabric. Before soaking in the solution, the non-woven fabric is pretreated with low-temperature plasma. After the low-temperature plasma pretreatment, the non-woven fabric is immersed in a solution containing cellulase. After the enzyme treatment, the non-woven fabric is placed in a solution containing a swelling agent.

3. The dyeing process for a nonwoven fabric according to claim 1, wherein: The dyeing step uses microencapsulated reactive dyes. During the dyeing process, in addition to traditional mechanical stirring, an electromagnetic stirring device is added, and microwave radiation is used. A spectral sensor is installed in the dyeing equipment to monitor the dye solution concentration and the color change of the non-woven fabric in real time. An electric field is set in the dyeing device, and the electrodes are made of stainless steel. The applied electric field strength is 10-20V / cm. A nanobubble generating device is introduced into the dye solution, and the diameter of the generated nanobubbles is 50-200nm. A certain proportion of natural biological dyes, such as curcumin and anthocyanin, is compounded with the reactive dye.

4. The dyeing process for a nonwoven fabric according to claim 1, wherein: In the color fixing step, in addition to the cationic color fixing agent, a water-based polyurethane color fixing agent is added. Before color fixing, the dyed non-woven fabric is subjected to low-temperature plasma treatment. During the color fixing process, the color fixing liquid is circulated through a filter device and an ion exchange resin column. After the color fixing is completed, the non-woven fabric is subjected to ultraviolet irradiation treatment. The ultraviolet wavelength is selected to be 254nm and the irradiation intensity is 5-10mW / cm 2 The irradiation time is 5-8 minutes, and an appropriate amount of cross-linking agent, such as glutaraldehyde, is added to the fixing solution. Nano-silica particles with a particle size of 30-80 nm are added to the fixing solution, and the addition amount is 0.1-0.3 g per 1000 ml of fixing solution.

5. The dyeing process for a nonwoven fabric according to claim 1, wherein: The post-processing step adds nanosilver particles to the silicone softener solution. Nanosilver has antibacterial properties and can impart antibacterial function to the non-woven fabric. During the post-processing process, a layer of ultraviolet protection coating is added. The drying step adopts supercritical carbon dioxide drying technology. After supercritical carbon dioxide drying, the non-woven fabric is sprayed with a green and environmentally friendly finishing agent. The finishing agent is made from plant extracts, such as tea polyphenols and aloe extract. For non-woven fabrics for specific purposes, shape memory finishing is performed in the post-processing. A shape memory polymer finishing agent is applied to the non-woven fabric by padding or coating. After supercritical carbon dioxide drying, the non-woven fabric is subjected to waterproof and breathable finishing. A finishing solution compounded with a fluorine-containing waterproofing agent and a silicone breathable agent is used to treat the non-woven fabric by an impregnation method.

6. The dyeing process for a nonwoven fabric according to claim 1, wherein: The pre-dyeing activation step is added between the pretreatment and dyeing steps, and the pre-dyeing activation step is added to soak the pretreated and dried non-woven fabric in a solution containing an activator for 5-10 minutes. The activator is a mixed solution of disodium ethylenediaminetetraacetate (EDTA-2Na) and triethanolamine, with mass concentrations of 0.2%-0.3% and 0.1%-0.2% respectively.

Images