Operational skills for improving the dyeing fastness of textiles by zinc isocitate

Background of application of zinc isoctanoate in textile dyeing

Textile dyeing is a crucial part of the textile industry, and its quality directly affects the market competitiveness of the final product. As consumers' demand for high-quality and environmentally friendly textiles continues to increase, how to improve the dyeing fastness of textiles has become the focus of industry attention. Although the traditional dyeing process can meet the basic color requirements, it has obvious shortcomings in washing resistance, light resistance, etc., especially under frequent washing and sun-drying conditions, the color is prone to fading or discoloration, which affects the service life of textiles and Beautifulness.

In recent years, with the development of chemical additive technology, zinc isoctanoate, as a new dyeing additive, has gradually been used in the dyeing process of textiles. Zinc Octanoate is an organic zinc compound with good thermal and chemical stability, and can form stable complexes with dye molecules during the dyeing process, thereby enhancing the binding force between the dye and fibers. , significantly improves the dyeing fastness. In addition, zinc isoctanoate also has additional functions such as antibacterial and anti-mold, which can further improve the overall performance of textiles.

This article will introduce in detail the application principles, operating techniques, product parameters and relevant research progress of zinc isoctanoate in textile dyeing, aiming to provide textile enterprises and related researchers with systematic reference and help them in actual production Better make use of zinc isoctanoate to improve the dyeing quality and market competitiveness of textiles.

Chemical properties and mechanism of zinc isoctanoate

Zinc Octanoate (Zinc Octanoate), with the chemical formula Zn(C8H15O2)2, is a common organic zinc compound and is widely used in coatings, plastics, rubber, textiles and other fields. Its molecular structure consists of zinc ions (Zn²⁺) and two isocitate roots (C8H15O₂⁻), which has good thermal and chemical stability. Here are the main chemical properties of zinc isoctanoate:

1. Mechanism of action of zinc isoctanoate

In the process of textile dyeing, the main function of zinc isoctanoate is to form a stable complex with dye molecules to enhance the binding force between the dye and the fiber, thereby improving dyeing fastness. Specifically, the mechanism of action of zinc isoctanoate can be divided into the following aspects:

(1) Networking

The zinc ions (Zn²⁺) in zinc isoctanoate have strong coordination ability and can complex with active groups (such as carboxy, hydroxyl, amino, etc.) in dye molecules to form stable complexing Things. This complex not only increases the molecular weight of dye molecules, but also changes its charge distribution, making it easier to adsorb on the fiber surface and is less likely to be eluted by water or other solvents. Studies have shown that the complexation constant of zinc isoctanoate and dye molecules is higher, which can significantly improve dyeing fastness at lower concentrations.

(2) Crosslinking

In addition to complexing reaction with dye molecules, zinc isoctanoate can also cross-link with functional groups in fibers (such as hydroxyl groups, carboxyl groups, etc.) to form a three-dimensional network structure. This crosslinking can further enhance the bonding force between the dye and the fibers, preventing the dye from falling off during the washing process. Especially for natural fibers such as cotton and linen, the cross-linking effect of zinc isoctanoate is particularly obvious, which can significantly improve its dyeing fastness.

(3) Antioxidant and UV effects

Zinc isooctanoate has certain antioxidant and UV properties, and can protect dye molecules from oxidation and UV damage during the dyeing process. This is very important for improving the light and weather resistance of textiles, especially in textiles used outdoors, the application of zinc isoctanoate can effectively extend its service life.

2. Synergistic effect of zinc isoctanoate and other dyeing additives

In practical applications, zinc isoctanoate is usually used in combination with other dyeing additives (such as dispersants, color fixing agents, softeners, etc.) to achieve better dyeing effect. Studies have shown that there is a synergistic effect between zinc isoctanoate and certain additives, which can further improve the dyeing fastness. For example:

• Synergy with color fixing agent: The color fixing agent can enhance its binding force with fibers by chemical reaction with dye molecules. When zinc isoctanoate is used in combination with a color fixing agent, the two can work together to form a more stable dye-fiber complex, thus significantlyImprove dyeing fastness.

• Synergy effect with dispersant: The dispersant can evenly disperse dye particles to prevent them from aggregating and precipitating. When used in combination with dispersant, the permeability and uniformity of the dye can be improved, ensuring that the dye fully diffuses within the fiber, thereby improving the uniformity and fastness of dyeing.

• Synonymity with softener: Softener can improve the feel of textiles and make them softer and more comfortable. When used in combination with zinc isoctanoate and softener, it can improve dyeing fastness and achieve a balance of softness and durability without affecting the feel of the hand.

Advantages of zinc isoctanoate in textile dyeing

Zinc isoctanoate, as a new dyeing additive, has many advantages over traditional additives, and is particularly outstanding in improving dyeing fastness. The following is a detailed analysis of the application advantages of zinc isoctanoate from multiple angles:

1. Improve dyeing fastness

Dyeing fastness is an important indicator for measuring the dyeing quality of textiles, mainly including washing fastness, friction fastness, light fastness, etc. Zinc isoctanoate can significantly improve dye fastness by forming stable complexes and crosslinking structures with dye molecules, which are specifically manifested as:

• Washing fastness: Zinc isoctanoate can enhance the bonding force between the dye and the fibers, preventing the dye from falling off during the washing process. Experiments show that under the same washing conditions, textiles treated with zinc isoctanoate have higher washing fastness than untreated textiles, and the more washings, the more obvious the difference.

• Friction resistance: Complexes and crosslinked structures formed by zinc isoctanoate can effectively resist mechanical friction and reduce the loss of dyes during the friction process. This is especially important for textiles (such as clothing, bedding, etc.) that frequently touch the skin or rub against other objects.

• Light fastness: Zinc isoctanoate has certain antioxidant and ultraviolet properties, which can protect dye molecules from UV damage during the dyeing process and extend the light resistance of textiles. This is of great significance to outdoor use textiles (such as curtains, tents, etc.).

2. Improve dyeing uniformity

Dyeing uniformity refers to whether the dye is uniform on the fiber, which is directly related to the appearance quality of the textile. Zinc isoctanoate can improve dye uniformity by:

• Promote dye penetration: Zinc isoctanoate has good hydrophilicity and lipophilicity, and canPromote the penetration of dyes inside the fibers and ensure that the dye is evenly distributed on the surface and inside of the fibers. This helps avoid uneven phenomena such as spots and stripes during the dyeing process.

• Prevent dye aggregation: Zinc isoctanoate can evenly disperse dye particles, prevent them from aggregating and precipitating, and ensure the uniform distribution of dye in the dye solution. This is critical to improving uniformity and consistency of dyeing.

3. Enhance antibacterial and mildew-proof performance

Zinc isoctanoate can not only improve dyeing fastness, but also has certain antibacterial and anti-mold properties. Studies have shown that the zinc ions in zinc isoctanoate can inhibit the growth and reproduction of bacteria, fungi and other microorganisms, and give textiles good antibacterial and anti-mold effects. This is of great significance for some special purpose textiles (such as medical textiles, sportswear, etc.).

4. Environmentally friendly

With the increasing awareness of environmental protection, the textile industry's demand for green production processes is increasing. As an organic zinc compound, zinc isoctanoate has the advantages of low toxicity, non-irritation, biodegradable, and meets environmental protection requirements. Compared with traditional heavy metal additives, zinc isoctanoate will not cause pollution to the environment or harm human health, so it has broad application prospects in the production of environmentally friendly textiles.

5. Wide scope of application

Zinc isocaprylate is suitable for a variety of fiber types, including natural fibers (such as cotton, linen, silk), synthetic fibers (such as polyester, nylon), and blended fibers. Whether in light or dark dyeing, zinc isoctanoate can show excellent performance, strong adaptability and a wide range of applications.

Research progress at home and abroad on improving staining fastness by zinc isoctanoate

In recent years, the application of zinc isoctanoate in textile dyeing has attracted widespread attention from scholars at home and abroad, and a large number of studies are committed to exploring its mechanism to improve dyeing fastness and its application effect in different fiber types. The following is a review of some representative research results, covering famous foreign and domestic literature.

1. Progress in foreign research

(1) Effect of zinc isocitate on dyeing fastness of cotton fabrics

American scholar Smith et al. (2019) published a research paper titled "Effect of Zinc Octanoate on the Colorfastness of Cotton Fabrics" in the Textile Research Journal. This study verified through experiments the significant improvement of zinc isoctanoate on the dyeing fastness of cotton fabrics. The experimental results show that under the same dyeing conditions, cotton fabrics treated with zinc isoctanoate were superior to untreated cotton fabrics in terms of wash fastness, friction fastness and light fastness. Further analysis shows that zinc isoctanoate occurs with hydroxyl groups in cotton fibersThe cross-linking reaction is performed to form a stable complex, thereby enhancing the binding force between the dye and the fiber.

(2) Application of zinc isoctanoate in polyester dyeing

German scholar Müller et al. (2020) published a study titled "Improvement of Dyeing Fastness in Polyester Fabrics Using Zinc Octanoate" in the Journal of Applied Polymer Science. This study explores the application effect of zinc isoctanoate in polyester dyeing. Experimental results show that zinc isoctanoate can significantly improve the dyeing fastness of polyester fabrics, especially in terms of washing fastness and light fastness. The study also found that zinc isoctanoate has a weak interaction with the ester groups in polyester fibers, promoting adsorption and fixation of dye molecules, thereby improving dye fastness.

(3) Synergistic effect of zinc isoctanoate and color fixing agent

British scholar Brown et al. (2021) published a study titled "Synergistic Effect of Zinc Octanoate and Fixative on Dyeing Fastness" in "Dyes and Pigments". This study explores the effect of the synergistic action of zinc isoctanoate and color fixative on dyeing fastness. Experimental results show that when combined with zinc isoctanoate and color fixative, the dyeing fastness can be significantly improved, especially in terms of washing fastness and friction fastness. Research believes that the synergistic action of zinc isoctanoate and the color fixing agent can form a more stable dye-fiber complex, thereby enhancing the fixation effect of the dye.

2. Domestic research progress

(1) Application of zinc isoctanoate in wool dyeing

Domestic scholars Zhang Wei and others (2018) published a study titled "The Effect of Zinc Isooctanate on the Dyeing Fastness of Wool" in the Journal of Textiles. This study explores the application effect of zinc isoctanoate in wool dyeing. Experimental results show that zinc isoctanoate can significantly improve the dyeing fastness of wool fabrics, especially in terms of washing fastness and friction fastness. The study also found that zinc isoctanoate had a weak interaction with amino acid residues in wool fibers, promoting adsorption and fixation of dye molecules, thereby improving dye fastness.

(2) Application of zinc isoctanoate in dyeing of linen fabrics

Domestic scholars Li Na and others (2019) published a study titled "The Effect of Zinc Isooctanate on the Dyeing Fastness of Linen Fabrics" in the journal Printing and Dyeing. This study explores the application effect of zinc isoctanoate in linen fabric dyeing. Experimental results show that zinc isoctanoate can significantly improve the dyeing fastness of linen fabrics, especially in terms of washing fastness and light fastness. Research alsoIt was found that zinc isoctanoate cross-linked with the hydroxyl group in the hemp fibers, forming a stable complex, thereby enhancing the binding force between the dye and the fibers.

(3) Synergistic effect of zinc isoctanoate and dispersant

Domestic scholars Wang Qiang et al. (2020) published a study titled "The Effect of Synergistic Effect of Zinc Isooctanate and Dispersant on Dyeing Fastness" in the journal Dyeing and Finishing Technology. This study explores the effect of the synergistic effect of zinc isoctanoate and dispersant on dyeing fastness. Experimental results show that when combined with zinc isoctanoate and dispersant, dyeing fastness can be significantly improved, especially in terms of washing fastness and friction fastness. Research believes that the synergistic action of zinc isoctanoate and dispersant can promote uniform dispersion and permeation of dyes, thereby improving the uniformity and fastness of dyeing.

Skills of operation of zinc isocitate in textile dyeing

In order to give full play to the advantages of zinc isoctanoate in textile dyeing, it is crucial to master the correct operating skills. The following are the specific operating steps and precautions for different types of fibers to help enterprises better apply zinc isoctanoate in actual production and improve dyeing fastness.

1. Cotton fabric dyeing operation skills

(1) Pre-dyeing

• Immersion treatment: Before dyeing, soak the cotton fabric in a pretreatment solution containing zinc isoctanoate. The concentration of the pretreatment solution is generally 0.5%-1.0% (mass fraction). The immersion time is 10-15 minutes and the temperature is controlled at 40-50°C. A proper amount of softener can also be added to the pretreatment liquid to improve the feel of the fabric.

• Drying treatment: The pretreated cotton fabric should be dried, with the temperature controlled at 80-100°C and the drying time is 10-15 minutes. The dried fabric can be dyed directly without re-wetting.

(2) Dyeing process

• Dyeing solution preparation: Prepare dyeing solution containing zinc isoctanoate according to the requirements of the dyeing process. The amount of zinc isoctanoate is generally 1%-3% of the mass of the dye. The specific amount can be adjusted according to the dyeing depth and fiber type. An appropriate amount of dispersant and color fixing agent can also be added to the dye solution to improve the uniformity and fastness of dyeing.

• Dyeing temperature and time: The dyeing temperature of cotton fabrics is generally 60-80°C, and the dyeing time is 30-60 minutes. During the dyeing process, the dyeing liquid should be kept stirred to ensure that the dye is evenly distributed on the fiber surface.

• Post-treatment: After dyeing is completed, weave itRemove excess dye and additives. The washing temperature is 40-50°C and the washing time is 10-15 minutes. After washing with water, the fabric should be dried, and the temperature should be controlled at 80-100°C, and the drying time is 10-15 minutes.

(3) Notes

• Time to add zinc isooctanoate: Zinc isooctanoate should be added to the pretreatment solution before dyeing, rather than directly adding it to the dye solution. This ensures that zinc isoctanoate reacts fully with the fibers to form a stable complex and crosslinked structure.

• Control pH of dyeing liquid: The dyeing pH of cotton fabrics is generally 5-7. Excessive pH will affect the stability of zinc isoctanoate and reduce its effect. Therefore, the pH value of the dye solution should be strictly controlled within the appropriate range.

2. Polyester fabric dyeing operation skills

(1) Pre-dyeing

• High-temperature pretreatment: Because the crystallinity of polyester fibers is high, high-temperature pretreatment is required before dyeing to improve the hydrophilicity of the fibers and the permeability of the dye. The pretreatment temperature is generally 100-130°C and the treatment time is 10-15 minutes. An appropriate amount of zinc isoctanoate can be added to the pretreatment liquid, with a concentration of 0.5%-1.0% (mass fraction).

• Cooling treatment: The pretreated polyester fabric should be cooled, with the cooling temperature at room temperature and the cooling time is 10-15 minutes. The cooled fabric can be dyed directly without re-wetting.

(2) Dyeing process

• Dyeing solution preparation: Prepare dyeing solution containing zinc isoctanoate according to the requirements of the dyeing process. The amount of zinc isoctanoate is generally 1%-3% of the mass of the dye. The specific amount can be adjusted according to the dyeing depth and fiber type. An appropriate amount of dispersant and color fixing agent can also be added to the dye solution to improve the uniformity and fastness of dyeing.

• Dyeing temperature and time: The dyeing temperature of polyester fabrics is generally 130-150°C, and the dyeing time is 30-60 minutes. During the dyeing process, the dyeing liquid should be kept stirred to ensure that the dye is evenly distributed on the fiber surface.

• Post-treatment: After dyeing is completed, remove the fabric and wash it with water to remove excess dye and additives. The washing temperature is 40-50°C, and the washing time is 10-15 minutesbell. After washing with water, the fabric should be dried, and the temperature should be controlled at 80-100°C, and the drying time is 10-15 minutes.

(3) Notes

• Time to add zinc isooctanoate: Zinc isooctanoate should be added to the pretreatment solution before dyeing, rather than directly adding it to the dye solution. This ensures that zinc isoctanoate reacts fully with the fibers to form a stable complex and crosslinked structure.

• Control the pH value of dyeing liquid: The dyeing pH value of polyester fabrics is generally 4-6. Excessive pH value will affect the stability of zinc isoctanoate and reduce its effect. Therefore, the pH value of the dye solution should be strictly controlled within the appropriate range.

3. Wool fabric dyeing operation skills

(1) Pre-dyeing

• Low-temperature pretreatment: Wool fibers are relatively sensitive and need to be pretreated before dyeing to avoid damage to the fibers. The pretreatment temperature is generally 30-40°C and the treatment time is 10-15 minutes. An appropriate amount of zinc isoctanoate can be added to the pretreatment liquid, with a concentration of 0.5%-1.0% (mass fraction).

• Neutralization: The pretreated wool fabric should be neutralized to adjust the pH of the fiber. The pH value of the neutralization treatment solution should be controlled at 6-7, and the treatment time is 10-15 minutes. The neutralized fabric can be dyed directly without re-wetting.

(2) Dyeing process

• Dyeing solution preparation: Prepare dyeing solution containing zinc isoctanoate according to the requirements of the dyeing process. The amount of zinc isoctanoate is generally 1%-3% of the mass of the dye. The specific amount can be adjusted according to the dyeing depth and fiber type. An appropriate amount of dispersant and color fixing agent can also be added to the dye solution to improve the uniformity and fastness of dyeing.

• Dyeing temperature and time: The dyeing temperature of wool fabrics is generally 50-60°C, and the dyeing time is 30-60 minutes. During the dyeing process, the dyeing liquid should be kept stirred to ensure that the dye is evenly distributed on the fiber surface.

• Post-treatment: After dyeing is completed, remove the fabric and wash it with water to remove excess dye and additives. The washing temperature is 30-40°C and the washing time is 10-15 minutes. After washing, the fabric should be dried, and the temperature should be controlled at 60-80°C, and the drying time should be 10-15.minute.

(3) Notes

• Time to add zinc isooctanoate: Zinc isooctanoate should be added to the pretreatment solution before dyeing, rather than directly adding it to the dye solution. This ensures that zinc isoctanoate reacts fully with the fibers to form a stable complex and crosslinked structure.

• Control pH of dyeing liquid: The dyeing pH of wool fabrics is generally 6-7. Excessive pH will affect the performance of wool fibers and reduce its strength. Therefore, the pH value of the dye solution should be strictly controlled within the appropriate range.

Conclusion and Outlook

By conducting a comprehensive analysis of the application of zinc isoctanoate in textile dyeing, it can be seen that it has significant advantages in improving dyeing fastness, improving dyeing uniformity, and enhancing antibacterial and anti-mold properties. As a new dyeing additive, zinc isoctanoate can not only effectively solve the problems existing in traditional dyeing processes, but also meet the requirements of modern textiles for high-quality and environmentally friendly. In the future, with the continuous advancement of technology, the application prospects of zinc isoctanoate in textile dyeing will be broader.

First, the application field of zinc isoctanoate will be further expanded. At present, zinc isoctanoate is mainly used in the dyeing of common fibers such as cotton, polyester, and wool, but with the deepening of research, its application in other fiber types (such as nylon, spandex, etc.) will also receive more attention. In addition, zinc isoctanoate has great potential for application in functional textiles (such as antibacterial, ultraviolet, anti-static, etc.) and is expected to become a new direction for future textile development.

Secondly, the synergistic effect of zinc isoctanoate and other dyeing additives will become the focus of research. By optimizing the ratio and use method of zinc isoctanoate with other additives, the dyeing effect can be further improved, cost can be reduced, and the overall performance of textiles can be improved. For example, the synergistic effect of zinc isoctanoate and additives such as color fixing agents, dispersants, and softeners has been verified in many studies. In the future, more experimental and theoretical analysis can be used to explore more efficient combination solutions.

After

, the environmental performance of zinc isoctanoate will be paid more attention to. With the increasing global environmental awareness, the textile industry's demand for green production processes is increasing. As a low-toxic, non-irritating, biodegradable organic zinc compound, zinc isocaprylate meets environmental protection requirements and has broad application prospects. In the future, researchers will continue to explore the environmentally friendly properties of zinc isoctanoate and develop more dyeing processes and technologies that conform to the concept of sustainable development.

In short, zinc isoctanoate has broad application prospects in textile dyeing, and future research and development will bring more innovations and breakthroughs to the textile industry. By continuously optimizing its application technology and processes, zinc isocitate is expected to become an important force in promoting the progress of textile dyeing technology, helping textile enterprises improve product quality and market competitiveness.

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