When dyeing, the cloth surface forms silicone spots, what should I do

The intuitive manifestation of silicon spots on the surface of the fabric is that it appears as small as the size of the tip to the size of the needle, and the area may be larger under extreme conditions. Sometimes it will have a certain color due to floating colors. The feel is soft and unparalleled. It is extremely difficult to find before drying, and it is extremely difficult to remove. It is caused by silicone oil breaking oil, and often appears after finishing and washing the soft process.

Reason for the formation of silicon spots

1. Alkaline problem

When cotton fabrics are treated in front of cotton fabrics, they usually use higher concentrations of alkali treatment to remove fabric impurities (especially the amount of silky alkali). The alkali is not easy to wash inside the fiber. The cloth surface may be alkaline when it is sorted.

The chemical fiber fabric must be restored and cleaned after the dyeing is completed. At present, the printing and dyeing plant is still using insurance powder and alkaline to clean it. If it is not cleaned later, it will also cause a soft front cloth with alkali. Ordinary silicon oil is impatient and will break the milk under alkaline conditions. This is why the factory causes adhesive rollers after a thousand kilometers when the factory is soaked. Therefore, the soft front cloth must be washed or added to the working liquid to keep the slot pH5-6.

2. Concrete problem

On the fabric containing short fiber (cotton cloth, T/R cloth, velvet), some short fibers will fall down during the processing process. Silicon oil is gathered. As the tidal liquid goes up to the roller, it is bonded with the squeezed silicon oil that is squeezed into the milk, forming a sticky roller or silicon spots. When the water quality is relatively poor, it will also condense sticky rollers with ordinary silicon oil. In addition, the fabric will also have similar situations. Do a good job of cleaning before driving and find that the flower hair is cleaned at any time.

3. Stability of charge

Most of the dyes and white agents used in cotton cloth are nobel -type, and cotton -gravity is basically completed on the setting machine. In addition, when the coloring of the dyeing cloth is not right, the color repair is needed. The color repair is usually added with a small amount of dye or coating when the soft tidal agent is used. The factory generally uses ordinary silicon oil (weak yang ion). And the softness of the silicon oil of the anion does not meet the requirements, causing confusion of the factory. The charge consistency must be considered during processing.

4. Temperature problem

The cloth stained with cotton long cars must be dried through the baked tube, large rolls or piled in a cloth box. If it is not fully cooled, especially the large roll of cloth, the surface temperature of the fabric surface may be higher when the soft roll is soft. The temperature of the rolling tank work liquid is increased (especially in summer), and sometimes it can reach above 60 ° C, and when the heat resistance of ordinary silicon oil is not good, the sticky roller can also be caused.

The temperature in the slot does not exceed 40 ° C.

5. Setting speed problem

When the factory is making some thin fabrics, the stereotype speed is very fast, and sometimes it can reach a speed of 60 meters/min. For ordinary silicon oil, due to poor permeability, the silicon oil is flowing upside down on the roller, resulting in sticky rollers. Pay attention to replacing the working fluid in the rolling slot and wipe the rolls frequently.

6. Dip -in cylinder problem

When many factories are soaked, ordinary silicon oil will be dipped on the wall of the cylinder. Over time, some black oil spots will form on the wall of the cylinder, which will form silicon spots on the cloth surface. Strengthen cleaning work.

7. feel

As the market's feel on the market is getting higher and higher, and various fabrics need to show a variety of different style requirements due to different seasons and different customer requirements. Fluffy, soft, simple elastic and so on. A silicon oil generally can only reflect a style. Therefore, many factories need to use many kinds of silicon oil, resulting in confusion in production. Sometimes they cannot find silicone oil suitable for customers. They can only give up business and cause losses. We can synthesize ammonia value viscosity and reactions by selecting different ammonia oil end control molecular weights and molecular distribution by different ammonia values to meet the requirements of various fibers to meet the soft and smooth elasticity of various fibers.

8. Cost problem

At present, the biggest problem with the puzzle of the printing and dyeing factory is the cost of cost. Due to the continuous rise in water, electricity, and steam prices, the processing costs of printing and dyeing are decreasing, resulting in a lot of printing and dyeing plants for one year. The problem to solve the factory.

Removal of silicon spots

1. The fabric is not set without high temperature

① washing of acetic acid

② High temperature treatment of solvent type oil removal agent.

2. The fabric has been set at high temperature

Dedicated fluorine and silicon stripper are treated under alkaline conditions.

The main principle is to relieve the hydrolysis of the fluorine silicon chain under alkaline conditions, and then use the hydrolyzed fluorine silicon chain segments to be emulsified and decentralized by the emulsification and decentralization ability of the fluorine silicon removal agent. So as to complete the removal of silicon spots and waterproof spots.

Note that the severe difficulty can be removed on the basis of alkali and fluorine peeling agents. In addition, the amount of peeling agent can be appropriately increased according to the severity of waterproof spots and silicon spots. Remove, you can appropriately increase the number of removal lanes to complete the spots.

For recycled cellulose or protein fiber, due to poor alkali resistance, the pH value of centered bases is recommended to 8.5-9.5 to avoid strong damage or excessive protein loss.

Silicone drift oil

Amino -silicon oil emulsion, color fixing agent, soft oil, etc. sometimes occur in silicon spots when used at the same time. When used alone, why not? Why?

Amino -silicon oil is not compatible with auxiliary agents such as fixing agent and soft oil, causing silicone oil to drift oil.

Amino -silicon oil emulsion is a cationic surfactant (or weak yang ion). Many of the chemicals used during the dyeing process are anion surfactants, such as: dyes (some dyes are ionic types), uniform dyes, diffusion agents, fixing colors Prevention. Essence Essence After the dyeing and reorganization of these chemicals, before the softening, once the water is not washed, the soft agent of the cationic amino silicon oil series and the ionic substance in the dyeing bath reacts the charge. Spots (silicon spots), effective ways to strengthen the sufficient water washing before soft finishing, preferably not to soften in the same dye. After washing the dyeing, pour the fabric and soften in the rolling.

The special cylinder is too soft to effectively avoid or reduce the formation of soft spots (silicon spots).

Printing and dyeing production common soft problems

1. Falcon hydrophilicity decreases

Generally, the softening structure problems and silicon oil are lacking water absorption genes, and hydroxyl groups such as cellulose fiber, carboxyls, amino groups such as wool, etc.

Approach:

You should choose silicone oil, non -ionic soft tablets and hydrophilic silicon oil as much as possible.

2. Dark pigmentation

Causes:

① The fabric oil is not cleaned during the pre -treatment, and the oil is deep in the oil stain during dyeing.

② There are too many foams in the dye bath, and mixtures such as foam and flower sweater, dyes are stained with fabrics.

③ The foaming agent drifting oil causes dark oil spots.

④ The caramel -stained in the dye tank is dipped on the fabric.

⑤ Dyes condensed in different cases into dark colored spots.

⑥ Excessive water and calcium and magnesium ions are combined with dyes.

Approach:

① Add oil agent to refine during the pre -treatment.

② The dyeing auxiliary agent uses a low foam and no foaming auxiliary agent.

③ Choose a variety that is not easy to float oil, add chelating agent to improve water quality, and add condensation of anti -dye dyes in the anti -ductile dispersion agent. Use the cylinder cleaner to clean the cylinder in time.

3. Lighter spots

Causes:

① The front treatment is uneven, and the hair in some parts is not good. During the processing, the cloth with calcium soap, magnesium soap, etc. or uneven light.

② Half -product drying is uneven.

③ The cloth surface is dipped in solids such as non -dissolved Yuanming powder and pure alkali.

④ Drop the water before drying.

⑤ Soft treatment of dyeing is spots that are brought when tied after finishing.

Treatment method: Strengthen the pre -treatment. When selection of the pre -treatment assistant, calcium and magnesium soap must be not easy to form. The pre -treatment must be evenly and thorough (this is related to the selection of precision agents, penetration agents, chelating dispersant, and silk light penetration). Yuanming powder and pure alkali must be transformed into the cylinder and must be strengthened.

4. Alkaline spots

Causes: Previous treatment (such as bleach, silk light) is not clean or uneven after alkali, causing alkali spots.

Treatment method: The alkali process of the previous processing process must be strengthened.

5. Silicon oil spots

Cause: The pH value of the cloth surface is not neutral, especially with alkali, causing silicone oil to break the milk. The quality of the bath water is too poor, and the hardness is too high. Silicone oil is easy to float oil in the water with the hardness of the hardness of 150 ppm. The quality of silicon oil includes lactation (poor choice of emulsifier, poor emulsification technology, too large emulsification particles, etc.), and not tolerated shear. Choose silicon oil that is resistant to shear, electrolytes, and pH changes in pH, but pay attention to the use of silicon oil, and you can also consider choosing silicon oil of parental water.

Postmodern language

At present, most of the dyeing factories have developed to centralized, intelligent, and scientific and technological development. Employees also operate according to the factory process. Be careful and be careful. It is inevitable that there will still be problems. There is no small matter for production. Each production step is important.