Preparation method of textile anti-color-migration coating
By adopting a composite coating process of cross-linking and inorganic particle filling on textiles, the contradiction between high color fastness and soft feel of the anti-color migration coating is solved, efficient anti-color migration effect and good film-forming properties are achieved, and production costs are reduced.
Patent Information
- Application Number
- CN202510946579.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-09
- Publication Date
- 2025-09-12
AI Technical Summary
In the prior art, the processing technology of anti-color migration coatings is difficult to maintain high color fastness while having a soft feel, and there are problems such as poor film formation and insufficient or excessive cross-linking leading to embrittlement of the coating.
A composite coating process of "cross-linking + inorganic particle filling" is adopted. Nano-inorganic particles and cross-linking agents are added to the water-based polyurethane resin through two composite coatings or a single composite coating method to form an anti-color migration coating. The amount of cross-linking agent and inorganic particles is controlled to improve film-forming properties and soft feel.
The prepared anti-color migration coating has both excellent color fastness and soft hand feel, and good film-forming property, thereby reducing production costs.
Smart Images
Figure CN120625367A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of textile processing, and in particular to a method for preparing a textile anti-color migration coating. Background Art
[0002] In the processing of dyed textiles, especially dark-colored textiles (such as black, red, etc.), anti-color migration coating is usually required to prevent the migration of dyes, so as to enhance the color fastness of the fabric, prevent discoloration and color contamination between different colorants.
[0003] In the prior art, in order to prevent color migration, inorganic particles are usually added to fill the micropores of the coating to slow down dye migration. However, the film-forming properties of the coating prepared by this method deteriorate, and the fabric feels harder. Cross-linking agents can also be added to fully cross-link the coating to slow down dye migration, but the cross-linking reaction of the cross-linking agent is difficult to control. Insufficient cross-linking cannot achieve the anti-color migration effect, and excessive cross-linking will make the coating directly hard and brittle, which also affects the feel of the fabric.
[0004] Therefore, how to improve the processing technology of anti-color migration coating so that the target fabric has both high color fastness and soft feel has become a technical problem that needs to be solved urgently. Summary of the Invention
[0005] In response to the above technical problems, the present invention provides a method for preparing an anti-color migration coating for textiles with excellent color fastness and soft touch.
[0006] The technical solution of the present invention is: A method for preparing a textile anti-color migration coating comprises the following steps: S1: preparing an inorganic particle resin; adding 1 to 5 parts by mass of a nano-inorganic particle dispersion to 100 parts by mass of an aqueous polyurethane resin, stirring uniformly, and then placing the mixture in a vacuum environment for degassing; S2: two composite coatings; S2.1: primary coating: coating the inorganic particle resin prepared in step S1 on the target fabric and drying; S2.2: preparing a cross-linked resin; adding 0.5 to 2 parts by weight of a cross-linking agent to 100 parts by weight of an aqueous polyurethane resin, stirring the mixture uniformly, and then placing the mixture in a vacuum environment for degassing; S2.3: Secondary coating: coating the cross-linked resin prepared in step S2.2 on the fabric treated in step S2.1 and drying the same to form a composite coating that prevents color migration on the fabric.
[0007] A method for preparing a textile anti-color migration coating comprises the following steps: S1: preparing an inorganic particle resin; adding 1 to 5 parts by mass of a nano-inorganic particle dispersion to 100 parts by mass of an aqueous polyurethane resin, stirring uniformly, and then placing the mixture in a vacuum environment for degassing; S3: single composite coating; S3.1: preparing a composite cross-linked resin; adding 0.5 to 2 parts by mass of a cross-linking agent to the inorganic particle resin prepared in step S1, stirring evenly, and then placing the mixture in a vacuum environment for degassing; S3.2: Coating: coating the composite cross-linked resin prepared in step S3.1 on the target fabric and drying it to form a composite coating that prevents color migration on the fabric.
[0008] The cross-linking agent includes isocyanate, polyether polyol or UV curing cross-linking agent.
[0009] The waterborne polyurethane resin includes polyether waterborne polyurethane and polyester waterborne polyurethane.
[0010] The nano inorganic particles are one of inorganic oxides including TiO2, SiO2, and ZnO, or a mixture of two or more.
[0011] The coating speed was set at 5 to 30 m / min.
[0012] Before vacuum degassing the resin, a tackifier is added to adjust its viscosity to 3000-8000 cps.
[0013] The present invention provides a method for preparing an anti-color migration coating for textiles, which innovatively adopts a composite coating process of "cross-linking + inorganic particle filling". In one embodiment, a "double composite coating method" is adopted, and a smaller amount of nano-inorganic particle dispersion is first used to provide an anti-color migration base layer to improve the film-forming property of the inorganic particle layer, and then a smaller amount of cross-linking agent is used to provide an anti-color migration reinforcement layer to prevent the cross-linked layer from becoming hard and brittle, so that the obtained anti-color migration coating can effectively fix the color and have a soft feel; in another embodiment, a "single composite coating method" is adopted, and a smaller amount of nano-inorganic particle dispersion and a smaller amount of cross-linking agent are mixed into the water-based polyurethane resin, so that the mixed resin has both good film-forming property and lower porosity, and the obtained coating has both a soft feel and excellent color fixation. The anti-color migration coating is formed by a single coating method, and the production cost is greatly reduced.
[0014] Both the "double-coating" and "single-coating" methods of the present invention effectively eliminate the drawbacks of using a single cross-linked layer or a single inorganic particle layer in color transfer prevention coatings. The resulting color transfer prevention coatings for textiles exhibit excellent film-forming properties, a soft touch, and excellent color transfer resistance for fabrics. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 Schematic diagram of the structure of the anti-color migration coating prepared in one embodiment of the present invention; Figure 2 It is a schematic structural diagram of a color migration prevention coating prepared according to another embodiment of the present invention. DETAILED DESCRIPTION
[0016] The following is combined with Figures 1-2 In the present invention, the prepared fabric is subjected to a color migration grade test using a grayscale card method; parts referred to herein are parts by mass.
[0017] The present invention provides a method for preparing a textile anti-color migration coating. The two-time composite coating method comprises the following steps: S1: preparing an inorganic particle resin; adding 1 to 5 parts by mass of a nano-inorganic particle dispersion to 100 parts by mass of an aqueous polyurethane resin, stirring the mixture evenly, and then placing the mixture in a vacuum environment for degassing; before degassing, a tackifier may be added to adjust the viscosity to 3000 to 8000 cps; S2: two composite coatings; S2.1: primary coating: coating the inorganic particle resin prepared in step S1 on the target fabric and drying; S2.2: Prepare a cross-linked resin; add 0.5 to 2 parts by weight of a cross-linking agent to 100 parts by weight of an aqueous polyurethane resin, stir well, and then place the mixture in a vacuum environment for degassing; before degassing, a tackifier may be added to adjust the viscosity to 3000 to 8000 cps; S2.3: Secondary coating: The cross-linked resin prepared in step S2.2 is coated on the fabric treated in step S2.1 and dried to form a composite coating that prevents color migration on the fabric. Figure 1 .
[0018] The single composite coating method comprises the following steps: S1: preparing an inorganic particle resin; adding 1 to 5 parts by mass of a nano-inorganic particle dispersion to 100 parts by mass of an aqueous polyurethane resin, stirring uniformly, and then placing the mixture in a vacuum environment for degassing; S3: single composite coating; S3.1: Preparing a composite cross-linked resin; adding 0.5 to 2 parts by mass of a cross-linking agent to the inorganic particle resin prepared in step S1, stirring uniformly, and then placing the mixture in a vacuum environment for degassing; before degassing, a tackifier may be added to adjust the viscosity to 3000 to 8000 cps; S3.2: Coating: The composite cross-linked resin prepared in step S3.1 is coated on the target fabric and dried to form a composite coating that prevents color migration on the fabric. Figure 2 .
[0019] Cross-linking agents include isocyanates, polyether polyols or UV curable cross-linking agents.
[0020] Waterborne polyurethane resins include polyether waterborne polyurethane and polyester waterborne polyurethane.
[0021] The nano-inorganic particles are one of inorganic oxides including TiO2, SiO2, and ZnO, or a mixture of two or more. The concentration of the nano-inorganic particle dispersion is preferably 5% to 10%.
[0022] The degassing time in vacuum environment is 1 to 3 hours. The stirring speed is set to 300 to 1000 r / min.
[0023] The coating speed was set at 5 to 30 m / min.
[0024] The drying temperature is set at 80-150°C. Example 1
[0025] To 100 parts of waterborne polyurethane resin, 5 parts of a 5% nano-TiO2 dispersion were added. The mixture was stirred thoroughly at 1000 rpm, the viscosity adjusted to 6000 cps, and then vacuum degassing was performed for 1 hour to obtain an inorganic particle resin. The inorganic particle resin was then applied to the target fabric using a coating machine with a coating blade spacing of 15 mm, a speed of 20 m / min, and an oven temperature of 130°C to obtain an inorganic particle-coated fabric. Separately, 100 parts of waterborne polyurethane resin were weighed, and 2 parts of a crosslinker were added. The mixture was stirred thoroughly at 1000 rpm, the viscosity adjusted to 5000 cps, and then vacuum degassing was performed for 1 hour to obtain a crosslinked resin. The crosslinked resin was then applied to the inorganic particle-coated fabric with a coating blade spacing of 15 mm, a speed of 30 m / min, and an oven temperature of 130°C to obtain a color transfer-resistant composite coated fabric. Testing showed that the resulting fabric had a color transfer test grade of 4-5 and a soft feel. Example 2
[0026] To 100 parts of waterborne polyurethane resin, 3 parts of a 5% nano-TiO2 dispersion were added. The mixture was stirred thoroughly at 700 rpm, the viscosity adjusted to 6000 cps, and then vacuum degassing was performed for 1 hour to obtain an inorganic particle resin. The inorganic particle resin was then applied to the target fabric using a coating machine with a coating blade spacing of 15 mm, a speed of 20 m / min, and an oven temperature of 130°C to obtain an inorganic particle-coated fabric. Separately, 100 parts of waterborne polyurethane resin were weighed, and 0.5 parts of a UV curing agent were added. The mixture was stirred thoroughly at 1000 rpm, the viscosity adjusted to 5000 cps, and then vacuum degassing was performed for 1 hour to obtain a cross-linked resin. The cross-linked resin was then applied to the inorganic particle-coated fabric with a coating blade spacing of 15 mm, a speed of 10 m / min, and UV irradiation for 1 minute in an oven temperature of 80°C to obtain a color transfer-resistant composite coated fabric. Testing showed that the resulting fabric had a color transfer test grade of 4-5 and a soft feel. Example 3
[0027] One part of a 5% nano-TiO2 dispersion was added to 100 parts of a waterborne polyurethane resin and thoroughly stirred at 700 rpm. The mixture was then vacuum degassed for 1 hour to produce an inorganic particle resin. Two parts of a crosslinker were then added to the inorganic particle resin. The mixture was thoroughly stirred at 1000 rpm, the viscosity adjusted to 3000 cps, and the mixture was vacuum degassed for 1 hour to produce a composite cross-linked resin. The composite cross-linked resin was then applied to the target fabric using a coating machine with a coating blade spacing of 15 mm, a speed of 5 m / min, and an oven temperature of 130°C to produce a color transfer-resistant composite coated fabric. Testing showed that the resulting fabric had a color transfer test grade of 4-5 and a soft feel. Example 4
[0028] To 100 parts of waterborne polyurethane resin, add 1 part of a 5% nano-TiO2 dispersion, stir thoroughly at 300 rpm, adjust the viscosity to 3000 cps, and then degas under vacuum for 1 hour to obtain an inorganic particle resin. The inorganic particle resin is then applied to the target fabric using a coating machine with a coating blade spacing of 15 mm, a speed of 5 m / min, and an oven temperature of 130°C to obtain an inorganic particle-coated fabric. Separately, 100 parts of waterborne polyurethane resin are weighed, and 2 parts of a crosslinker are added. Stir thoroughly at 1000 rpm, adjust the viscosity to 8000 cps, and then degas under vacuum for 1 hour to obtain a crosslinked resin. The crosslinked resin is then applied to the inorganic particle-coated fabric with a coating blade spacing of 15 mm, a speed of 20 m / min, and an oven temperature of 150°C to obtain a color transfer-resistant composite coated fabric. Testing shows that the resulting fabric has a color transfer test grade of 4-5 and a soft feel. Example 5
[0029] To 100 parts of waterborne polyurethane resin, 5 parts of a 5% nano-TiO2 dispersion were added. The mixture was stirred thoroughly at 1000 rpm, the viscosity adjusted to 8000 cps, and then vacuum degassing was performed for 1 hour to obtain an inorganic particle resin. 0.5 parts of a crosslinking agent were then added to the inorganic particle resin, stirred thoroughly at 300 rpm, and vacuum degassing was performed for 1 hour to obtain a composite cross-linked resin. This composite cross-linked resin was then coated onto the target fabric using a coating machine with a 15 mm blade spacing, a speed of 30 m / min, and an oven temperature of 120°C to obtain a color transfer-resistant composite coated fabric. Testing showed that the resulting fabric achieved a color transfer test grade of 4-5 and had a soft feel.
[0030] Comparative Example 1: To 100 parts of waterborne polyurethane resin, 10 parts of a 5% nano-TiO2 dispersion were added. The mixture was stirred thoroughly at 1000 rpm, the viscosity adjusted to 6000 cps, and then vacuum degassing was performed for 1 hour to produce an inorganic particle resin. The inorganic particle resin was then applied to the target fabric using a coating machine with a 15mm blade spacing, a speed of 20 m / min, and an oven temperature of 130°C to produce the inorganic particle-coated fabric. Testing showed that the resulting fabric achieved a color migration grade of 3-4 and a hard feel.
[0031] Comparative Example 2: 5 parts of a crosslinker were added to 100 parts of a waterborne polyurethane resin. The mixture was stirred thoroughly at 1000 rpm, and the viscosity was adjusted to 5000 cps. The mixture was then vacuum degassed for 1 hour to produce a crosslinked resin. The crosslinked resin was then applied to the target fabric using a coating machine with a blade spacing of 15 mm, a speed of 20 m / min, and an oven temperature of 130°C to produce a crosslinked coated fabric. Testing showed that the resulting fabric achieved a color migration grade of 3-4 and had a hard feel.
[0032] Regarding the contents disclosed in the present invention, the following points need to be explained: (1) The embodiments disclosed in the present invention are merely examples, and any technical solution implemented by other equivalent alternative technical means shall fall within the scope of protection of the present invention; (2) In the absence of conflict, the technical features disclosed in the present invention may be combined with each other to obtain new embodiments; The above are only specific implementation methods disclosed in the present invention, but the protection scope of the present invention is not limited thereto. Technical solutions obtained by those skilled in the art after modifying or transforming certain technical features based on the contents disclosed in the present invention should all fall within the protection scope of the present invention.
Claims
1. A method for preparing a textile anti-color migration coating, characterized in that: The following steps are involved: S1: preparing an inorganic particle resin; adding 1 to 5 parts by mass of a nano-inorganic particle dispersion to 100 parts by mass of an aqueous polyurethane resin, stirring uniformly, and then placing the mixture in a vacuum environment for degassing; S2: two composite coatings; S2.1: primary coating: coating the inorganic particle resin prepared in step S1 on the target fabric and drying; S2.2: preparing a cross-linked resin; adding 0.5 to 2 parts by weight of a cross-linking agent to 100 parts by weight of an aqueous polyurethane resin, stirring the mixture uniformly, and then placing the mixture in a vacuum environment for degassing; S2.3: Secondary coating: coating the cross-linked resin prepared in step S2.2 on the fabric treated in step S2.1 and drying the same to form a composite coating that prevents color migration on the fabric.
2. A method for preparing a textile anti-color migration coating, characterized in that: The following steps are involved: S1: preparing an inorganic particle resin; adding 1 to 5 parts by mass of a nano-inorganic particle dispersion to 100 parts by mass of an aqueous polyurethane resin, stirring uniformly, and then placing the mixture in a vacuum environment for degassing; S3: single composite coating; S3.1: preparing a composite cross-linked resin; adding 0.5 to 2 parts by mass of a cross-linking agent to the inorganic particle resin prepared in step S1, stirring evenly, and then placing the mixture in a vacuum environment for degassing; S3.2: Coating: coating the composite cross-linked resin prepared in step S3.1 on the target fabric and drying it to form a composite coating that prevents color migration on the fabric.
3. The method for preparing a textile anti-color migration coating according to claim 1 or 2, characterized in that: The cross-linking agent includes isocyanate, polyether polyol or UV curing cross-linking agent.
4. The method for preparing a textile anti-color migration coating according to claim 1 or 2, characterized in that: The waterborne polyurethane resin includes polyether waterborne polyurethane and polyester waterborne polyurethane.
5. The method for preparing a textile anti-color migration coating according to claim 1 or 2, characterized in that: The nano inorganic particles are one of inorganic oxides including TiO2, SiO2, and ZnO, or a mixture of two or more.
6. The method for preparing a textile anti-color migration coating according to claim 1 or 2, characterized in that: The coating speed was set at 5 to 30 m / min.
7. The method for preparing a textile anti-color migration coating according to claim 1 or 2, characterized in that: Before vacuum degassing the resin, a tackifier is added to adjust its viscosity to 3000-8000 cps.