Application scope of textile wetting agents: invisible helpers of textile processing

In the vast and delicate field of the textile industry, the transformation of each piece of cloth from fiber to finished product is inseparable from the assistance of many auxiliaries. Among them, textile wetting agents, as a seemingly ordinary but crucial chemical, play a key role in many links of textile processing. It can reduce the surface tension of the liquid, promote the spreading and penetration of the liquid on the fiber surface, and effectively improve the textile processing effect. Next, let us take a deeper look at the wide range of applications of textile wetting agents.

I. Application in textile pretreatment process

(I) Desizing treatment

During the textile weaving process, sizing is usually applied to the warp yarn to improve its weavability. However, these sizings will affect the subsequent dyeing, printing and finishing processes, so desizing treatment is required. Textile wetting agents play an important role in the desizing process. They can quickly reduce the surface tension of the desizing liquid, allow the desizing liquid to quickly penetrate into the fabric, and effectively remove the sizing on the fabric surface and between the fibers. For example, in the desizing of cotton fabrics, the desizing liquid containing a high-efficiency wetting agent can diffuse faster to the interface between the slurry and the fiber, weaken the bonding force between the slurry and the fiber, thereby improving the desizing efficiency and effect, and laying a good foundation for subsequent processing.

(II) Scouring process

The purpose of scouring is to remove natural impurities, grease, wax, etc. on the fabric, so that the fabric has good wettability, whiteness and feel. Textile wetting agents can help the scouring liquid penetrate better into the fiber, so that the scouring agent can fully play its role. Taking the scouring of linen fabric as an example, linen fibers contain more impurities such as pectin and hemicellulose, which will affect the quality and dyeing performance of the fabric. By adding a suitable textile wetting agent, the scouring liquid can quickly penetrate into the gaps of the linen fiber, so that the scouring agent and the impurities can fully contact and react, thereby effectively removing impurities, improving the whiteness and softness of the fabric, and enhancing the fabric's ability to adsorb dyes.

(III) Bleaching process

Bleaching is to improve the whiteness and color brightness of the fabric. During the bleaching process, textile wetting agents help the bleaching agent to be evenly distributed on the fabric surface and inside the fiber, preventing the occurrence of local uneven bleaching. For example, in the hydrogen peroxide bleaching process, the wetting agent can reduce the surface tension of the hydrogen peroxide solution, allowing it to quickly penetrate into the fiber and fully react with impurities such as pigments, thereby achieving uniform bleaching. At the same time, the wetting agent can also reduce the damage to the fiber during the bleaching process and improve the strength and durability of the fabric.

II. Application in the dyeing process

(I) Promote dye penetration

During the dyeing process, the dye needs to penetrate evenly into the fiber to achieve a good dyeing effect. Textile wetting agents can reduce the surface tension of the dye solution, allowing the dye solution to spread quickly on the fabric surface and quickly penetrate into the fiber gaps. Taking the dyeing of cotton fabrics with reactive dyes as an example, the wetting agent can help the reactive dye molecules diffuse faster into the amorphous area of the cotton fiber, covalently bond with the fiber, and improve the dye uptake and dyeing fastness of the dye. At the same time, uniform dye penetration can also avoid dyeing defects such as color spots and color flowers, so that the fabric obtains a uniform and bright color.

(II) Improving dyeing uniformity

Different fibers have different surface properties and structures, which may lead to uneven adsorption and diffusion of dyes on fabrics. Textile wetting agents can improve the wettability of fiber surfaces and make dye adsorption on fiber surfaces more uniform. For example, in disperse dye dyeing of polyester fabrics, the dye is not easy to adsorb uniformly due to the smooth surface and strong hydrophobicity of polyester fibers. After adding a suitable wetting agent, the wetting agent molecules will adsorb on the surface of polyester fibers, reduce the surface energy of the fibers, and enable disperse dyes to be more evenly dispersed on the fiber surface and gradually penetrate into the fiber interior, thereby improving the uniformity of dyeing and obtaining high-quality dyed fabrics.

(III) Improving dyeing efficiency

Textile wetting agents can accelerate the diffusion rate of dyes in fibers, shorten dyeing time, and improve dyeing efficiency. In continuous dyeing production, the role of wetting agents is particularly obvious. It can make the dye solution spread and penetrate quickly on the fabric surface, reduce the residence time of the fabric in the dye tank, and thus improve production efficiency. At the same time, since the dye can be more fully utilized, it can also reduce the consumption of dyes and save production costs.

III. Application in the printing process

(I) Improving the permeability of printing paste

During the printing process, the printing paste needs to penetrate into the fabric to form a clear and firm pattern. Textile wetting agents can reduce the surface tension of the printing paste, making it easier to penetrate into the fiber gaps of the fabric. For example, in paint printing, wetting agents can help the paint particles to be evenly distributed on the fiber surface and penetrate into the fiber, improving the clarity and color brightness of the printed pattern. At the same time, good permeability can also enhance the bonding force between the paint and the fiber, improve the fastness of the print, and prevent the pattern from falling off during washing.

(II) Preventing the phenomenon of infiltration

During the printing process, if the wettability of the printing paste is not properly controlled, infiltration is likely to occur, resulting in blurred pattern edges. Textile wetting agents can control the spreading range of the paste on the fabric by adjusting the surface tension and viscosity of the paste to prevent the occurrence of infiltration. For example, in fine printing, the use of a wetting agent with special properties can enable the printing paste to form a precise pattern outline on the fabric, improving the accuracy and quality of printing.

(III) Improving the feel of printed fabrics

Some textile wetting agents not only have a wetting function, but also can give printed fabrics a good feel. By adding a wetting agent containing softening ingredients to the printing paste, the fabric can be softened while printing, making the printed fabric feel soft and plump, thereby increasing the added value of the product.

IV. Application in textile finishing processes

(I) Softening finishing

During the softening finishing process, textile wetting agents can help the softener penetrate into the fiber better and evenly distribute the softener on the fiber surface, thereby improving the softening finishing effect. For example, when using silicone softener to finish fabrics, the wetting agent can reduce the surface tension of the silicone softener emulsion, allowing it to quickly penetrate into the fiber gaps, forming a uniform soft film on the fiber surface, giving the fabric a soft, smooth and plump feel.

(II) Water- and oil-repellent finishing

In water- and oil-repellent finishing, textile wetting agents can promote the uniform distribution and adsorption of water- and oil-repellent finishing agents on the fabric surface. It can reduce the surface tension of the finishing liquid, so that the finishing liquid can be better spread on the fabric surface and penetrate into the micropores of the fiber, thereby improving the effect of water-repellent and oil-repellent finishing. For example, when using fluorine-containing water-repellent and oil-repellent finishing agents to finish fabrics, wetting agents can help the fluorine-containing finishing agent molecules to adhere more closely to the fiber surface, forming a continuous water-repellent and oil-repellent film, so that the fabric has excellent water-repellent and oil-repellent properties.

(III) Antistatic finishing

In the antistatic finishing process, textile wetting agents help the antistatic agent to be evenly distributed on the fabric surface and inside the fiber. It can reduce the surface tension of the antistatic agent solution, so that the antistatic agent solution can quickly penetrate into the fiber, forming a conductive layer on the fiber surface, thereby improving the antistatic performance of the fabric. For example, in the antistatic finishing of synthetic fiber fabrics, adding a wetting agent can make the antistatic agent play a better role and effectively reduce the static electricity generated by the fabric during wearing and use.

Textile wetting agents have a wide range of important applications in various processes such as pre-treatment, dyeing, printing and finishing of textile processing. It effectively improves the quality and efficiency of textile processing and enhances the quality and performance of textile products by reducing liquid surface tension, promoting liquid penetration and uniform distribution. With the continuous development of the textile industry and the increasing requirements for product quality, the performance and application of textile wetting agents will continue to innovate and expand, providing strong support for the sustainable development of the textile industry.