Textile after-finishing deepening method and auxiliary composition

Abstract

The invention relates to a textile after-finishing deepening method and an auxiliary composition, the auxiliary composition for textile after-finishing deepening comprises a deepening agent and a dispersing agent, the deepening agent is a polysiloxane deepening agent, the dispersing agent is a nonionic surfactant, and the mass ratio of the dispersing agent to the deepening agent is 1: 20-1: 60. According to the invention, the dispersing agent mainly used in the previous process is innovatively applied to the after-finishing stage, so that the technical contradiction of'darkening must be accompanied by oil spots' which puzzles the industry for a long time is accurately solved, and the purpose of safely and effectively adjusting the color depth after printing is completed is achieved; and through scientific compounding of the deepening agent and the dispersing agent, oil spots are inhibited on the molecular level, so that a high-quality product with a uniform surface and no defects is obtained on the premise that the color deepening effect is not sacrificed.

Description

Technical Field

[0001] This invention relates to the field of textile printing and dyeing finishing technology, specifically to a textile finishing deepening method and auxiliary composition for improving the color depth of printed fabrics, which is particularly suitable for solving the problem of oily defects (commonly known as oil spots or oil patches) on the fabric surface during the finishing deepening process. Background Technology

[0002] Digital printing technology is widely used due to its high flexibility and suitability for small-batch production. However, unlike traditional dyeing processes, once digital printing is completed, its color is difficult to adjust through conventional rework processes, especially for dark colors, which often face the bottleneck of insufficient color depth (K / S value).

[0003] To address this issue, the industry has attempted to add color-enhancing agents (such as silicone-based hand-feel enhancers) during the finishing stage of printed fabrics, such as in the padding tank of a tenter frame, to improve the color performance of the fabric surface. However, this method has introduced a new and serious drawback in practice: the hydrophobic components in the color-enhancing agent tend to accumulate locally on the fabric surface during high-temperature setting, forming stubborn oil spots that are difficult to eliminate, leading to a significant drop in product yield. This puts the "finishing enhancement" solution in a dilemma: without color-enhancing agents, the color depth will not meet the standards, while using color-enhancing agents will result in appearance defects.

[0004] Currently, conventional solutions to this problem mainly focus on adjusting the formulation of the color deepening agent, changing the brand of the color deepening agent, or optimizing the stenter parameters (such as temperature and speed). However, the results are not ideal and cannot fundamentally eliminate oily defects (commonly known as oil spots or oil patches). Therefore, there is an urgent need to develop a new method that can effectively solve the above-mentioned problem, so as to safely and effectively improve the color depth of digitally printed products without introducing oily defects (commonly known as oil spots or oil patches). Summary of the Invention

[0005] In order to solve the above-mentioned technical problems in the prior art, the present invention provides a textile finishing and deepening method and a special auxiliary agent composition thereof that can effectively prevent the formation of oil spots and significantly improve the color.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides an auxiliary composition for deepening the color of textile finishing, comprising a deepening agent and a dispersant, wherein the deepening agent is a polysiloxane-based deepening agent, the dispersant is a nonionic surfactant, and the mass ratio of the dispersant to the deepening agent is 1:20-1:60.

[0007] Secondly, the present invention provides a working solution for deepening the finishing of textiles, which is prepared by compounding the above-mentioned auxiliary agent composition with water, comprising, by weight percentage: 15-25% of the deepening agent, 0.2-1.0% of the dispersant, and the balance being water.

[0008] As a further preferred embodiment of the present invention, the mass fraction of the deepening agent is 20%, and the mass fraction of the dispersant is 0.5%.

[0009] As a further preferred embodiment of the present invention, the mass ratio of the dispersant to the deepening agent is 1:40.

[0010] As a further preferred embodiment of the present invention, the textile is a cellulose fiber fabric, a protein fiber fabric, or a blended fabric.

[0011] Thirdly, the present invention provides a method for enhancing the finishing of textiles, comprising the following steps: Step S1: Immerse the printed textile in the working solution for textile finishing and deepening described in any of the above-mentioned steps; Step S2: The textiles that have been impregnated in step S1 are stretched, dried and shaped.

[0012] As a further preferred embodiment of the present invention, the textiles in step S1 are treated by padding in the working solution to control the padding rate to 65%-75%.

[0013] As a further preferred embodiment of the present invention, the textile is treated in the auxiliary composition by a one-dip-one-nip or two-dip-two-nip method.

[0014] As a further preferred embodiment of the present invention, the temperature for stretching and drying is 105-120℃; the speed is 18-25 meters / minute.

[0015] As a further preferred embodiment of the present invention, the temperature for stretching and drying is 110°C; the speed is 20 meters per minute.

[0016] The textile finishing and darkening method and its special auxiliary composition of the present invention, by adopting the above technical solution, have the following beneficial effects: 1. Creatively solves industry problems: The dispersant, which is mainly used in the pre-processing stage, is innovatively applied to the post-processing stage, which precisely solves the long-standing technical contradiction in the industry that "deepening is always accompanied by oily defects (commonly known as oil spots or oil patches)", and achieves the goal of safely and effectively adjusting the color depth after printing.

[0017] 2. Significant Synergistic Effect: Through the scientific compounding of color deepening agent and dispersant, the generation of oily defects (commonly known as oil spots or oil patches) is suppressed at the molecular level, thereby obtaining a high-quality product with uniform surface and no defects without sacrificing the color deepening effect. The two produce a synergistic effect of "1+1>2". The dispersant achieves the anti-oil spot effect through the following mechanisms: (1) The dispersant molecules insert between the hydrophobic components of the color deepening agent, preventing their aggregation through steric hindrance effect; (2) The dispersant reduces the surface tension of the color deepening agent and improves its spreadability on the fiber surface; (3) During the high-temperature setting process, the dispersant forms a protective layer, inhibiting the phase separation of the hydrophobic components of the color deepening agent.

[0018] 3. Wide applicability: This application is not only applicable to pure cotton fabrics, but can also be extended to other high-value-added fabrics with high appearance requirements, such as silk and blended fabrics.

[0019] 4. Simple and economical process: No modification to existing equipment is required. By simply adding a common additive (dispersant) in the conventional tenter frame process, a leap in product quality can be achieved. It is easy to promote industrialization and has significant economic benefits. Detailed Implementation

[0020] The technical solution of the present invention will be described in detail below with reference to the embodiments. It should be understood that the following embodiments are only used to illustrate the present invention and should not be regarded as a limitation on the scope of protection of the present invention.

[0021] The present invention provides an auxiliary composition for deepening the color of textile finishing, comprising a deepening agent and a dispersant, wherein the deepening agent is a polysiloxane-based deepening agent, the dispersant is a nonionic surfactant, and the mass ratio of the dispersant to the deepening agent is 1:20-1:60.

[0022] In this invention, the use of the dispersant differs fundamentally from that in the prior art, as detailed in the table below: Comparison Dimensions Traditional uses of dispersants Novel Uses of Dispersants in This Application Target Dyes (solid particles such as disperse dyes and vat dyes) Deepening agents (usually polymer solutions or emulsions such as silicone and polyurethane) Phase of action Pretreatment or dyeing / printing stage (front end of production) The stentering and setting process in the post-finishing stage (the final stage of production) The problem to be solved To prevent color spots and uneven dyeing caused by dye aggregation. To prevent the appearance defects of oil spots / oil patches caused by the aggregation of hydrophobic components in the deepening agent. Technical Purpose Achieve uniform coloring While achieving color deepening, the appearance quality of the fabric is guaranteed. This invention breaks through the traditional understanding that dispersants are only used for dye dispersion, and creatively applies them to the finishing stage, forming a synergistic effect with deepening agents, thus solving a long-standing technical contradiction in the industry.

[0023] In a preferred embodiment of this application, the working fluid comprises, by weight percentage: 15-25% of the deepening agent, 0.2-1.0% of the dispersant, and the balance being water. Preferably, the mass fraction of the deepening agent is 20%, and the mass fraction of the dispersant is 0.5%.

[0024] More preferably, the mass ratio of the dispersant to the deepening agent is 1:40.

[0025] In specific implementation, the textile (hereinafter referred to as fabric) is a cellulose fiber fabric, a protein fiber fabric, or a blended fabric. Specifically, the cellulose fiber fabric can be pure cotton or viscose; the protein fiber fabric can be silk or wool; and the blended fabric can be polyester-cotton or nylon-cotton.

[0026] The present invention also provides a method for enhancing the finishing of textiles, comprising the following steps: Step S1: Immerse the printed textile in the working solution for textile finishing and deepening described in any of the above-mentioned methods; preferably, before performing step S1, pre-treat the printed textile, such as steaming or washing the textile.

[0027] Step S2: The textiles that have been impregnated in step S1 are stretched, dried and shaped.

[0028] Preferably, the textiles from step S1 are treated in the working solution by padding, with the padding rate controlled at 65%-75%. For example, the textiles are treated in the working solution by one dip and one pad or two dips and two pads.

[0029] In practice, the temperature for stretching and drying is 105-120℃, and the machine speed is 18-25 meters per minute. Preferably, the temperature for stretching and drying is 110℃, and the machine speed is 20 meters per minute.

[0030] To enable those skilled in the art to better understand and implement the technical solutions of the present invention, the technical solutions of the present invention will be described in detail below in the form of embodiments.

[0031] Example 1: Deepening treatment of pure cotton digitally printed fabric Fabric: 40S pure cotton plain knit fabric, digitally printed with reactive dyes (the pattern includes a large area of ​​dark black).

[0032] Preparation of working solution: Under stirring conditions, add 20 kg of commercially available deepening agent (in this case, Huntsman's DICRYLAN® SD deepening agent, product model 0120, with a chemical composition of modified amino-dimethylsiloxane emulsion, belonging to the polysiloxane class of deepening agents) and 0.5 kg of commercially available dispersant (in this case, Huntsman's LYOPRINT® AP dispersant and penetrant, with a chemical composition of a nonionic formulation based on aliphatic carboxyl compounds and saturated aliphatic and higher aromatic hydrocarbons, belonging to the nonionic surfactant class) to 100 kg of water, and stir until homogeneous to obtain the working solution. The mass fraction of deepening agent is 20%, and the mass fraction of dispersant is 0.5%, with a mass ratio of 1:40.

[0033] Post-processing: The printed fabric is dipped and rolled in the working solution in one dip and one roll, with the roll-off rate controlled at about 70%. The fabric is then fed into a tenter frame and dried and set at a setting temperature of 110°C and a speed of 20 m / min.

[0034] Evaluation of Results: The treated fabric sample exhibits a deep and rich color. Colorimeter measurements show that the K / S value in the deep black area is approximately 28% higher than the untreated sample. The fabric surface is smooth and uniform; no oily defects (commonly known as oil spots or blemishes) were found upon visual or tactile inspection. It has a soft and smooth feel, meeting the standards for superior quality.

[0035] Comparative Example 1 (using only a deepening agent) Except for the absence of a dispersant and penetrant, the working solution preparation and deepening method were the same as in Example 1. Results: The color depth of the fabric sample increased, but a large number of unevenly distributed small to medium-sized oily blemishes appeared on the fabric surface, and the fabric felt rough to the touch. The product was judged to be a serious appearance defect.

[0036] Comparative Example 2 (using dispersant only) Except for the absence of a color deepening agent, the preparation of the working solution and the color deepening method were the same as in Example 1. Results: The fabric surface was clean and free of oily defects (commonly known as oil spots or oil patches), but the color depth (K / S value) was not significantly different from the untreated original sample, and the color deepening purpose was not achieved.

[0037] Example 2: Deepening treatment of digitally printed silk fabrics Fabric: 16 momme silk crepe satin, digitally printed with acid dyes (deep royal blue).

[0038] Preparation of working solution: Add 18 kg of similar deepening agent and 0.45 kg of dispersant to 100 kg of water and stir until homogeneous.

[0039] Post-finishing process: Two dips and two rolls are used, with a roll residue of 65%, and the shape is set at 108℃ and a speed of 18 m / min.

[0040] Evaluation of results: The color depth is significantly improved, the fabric has a soft and even luster, no oil spots, and retains the unique noble feel of silk.

[0041] Example 3: Deepening treatment of polyester-cotton blend printed fabrics Fabric: 65 / 35 polyester-cotton blend woven fabric, digitally printed with disperse / reactive dyes.

[0042] Preparation of working solution: Add 22 kg of deepening agent and 0.55 kg of dispersant to 100 kg of water and stir until homogeneous.

[0043] Post-finishing process: one dip and one roll, with a roll residue of 75%, and shaping at 115℃ and a speed of 22 m / min.

[0044] Evaluation of results: Color saturation was significantly improved, the fabric surface was clean, and no oily defects (commonly known as oil spots or oil patches) were produced. Both polyester and cotton fibers performed well.

[0045] in conclusion:

[0046] The above examples and comparative examples fully demonstrate that deepening agents and dispersants must be used in combination in the textile finishing deepening method of the present invention to synergistically achieve the unexpected technical effect of "oil-free dark color processing," which cannot be achieved by a single component. The present invention breaks through the limitations of traditional auxiliary agent applications and provides a reliable solution for high-quality finishing of digitally printed products.

[0047] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and various changes or modifications can be made to these embodiments without departing from the principles and essence of the present invention. The scope of protection of the present invention is defined only by the appended claims.

Claims

1. A composition of auxiliary agents for deepening the finishing of textiles, characterized in that, It includes a deepening agent and a dispersant, wherein the deepening agent is a polysiloxane-based deepening agent, the dispersant is a nonionic surfactant, and the mass ratio of the dispersant to the deepening agent is 1:20-1:

60.

2. A working solution for deepening the finish of textiles, characterized in that, The working solution comprises the additive composition of claim 1 and water, and by weight percentage, the working solution comprises: 15-25% of the deepening agent, 0.2-1.0% of the dispersant, and the balance being water.

3. The working fluid according to claim 2, characterized in that, The mass fraction of the deepening agent is 20%, and the mass fraction of the dispersant is 0.5%.

4. The auxiliary composition according to claim 1 or the working solution according to claim 2 or 3, characterized in that, The mass ratio of the dispersant to the deepening agent is 1:

40.

5. The working fluid according to claim 2 or 3, characterized in that, The working solution is suitable for finishing and deepening of cellulose fiber fabrics, protein fiber fabrics, or blended fabrics; the cellulose fiber fabrics are preferably pure cotton or viscose; the protein fiber fabrics are preferably silk or wool; and the blended fabrics are preferably polyester-cotton or nylon-cotton.

6. A method for enhancing the finishing effect of textiles, characterized in that, Includes the following steps: Step S1: Immerse the printed textile in the working solution described in any one of claims 2 to 5; Step S2: The textiles that have been impregnated in step S1 are stretched, dried and shaped.

7. The textile finishing and deepening method according to claim 6, characterized in that, The textiles from step S1 are treated by padding in the working solution, with the padding rate controlled at 65%-75%.

8. The textile finishing and deepening method according to claim 7, characterized in that, The textiles are treated in the working solution by one dip and one squeezing or two dips and two squeezings.

9. The textile finishing and deepening method according to any one of claims 6 to 8, characterized in that, The temperature for stretching, drying, and shaping is 105-120℃; the speed is 18-25 meters per minute.

10. The textile finishing and deepening method according to claim 9, characterized in that, The temperature for stretching, drying, and shaping is 110℃; the speed of the machine is 20 meters per minute.