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Dyeing color flowers cause analysis and Countermeasures

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Dyeing color flowers cause analysis and Countermeasures

Release date:2017-01-13 Author:科润生物 Click:

The reason of color flower:

1 improper choice of dyes

Unlike other dyeing dyeing acrylic fiber, dye if improper even by the addition of leveling agent or improve the dyeing conditions it is difficult to achieve the leveling effect. Therefore, choose the same value should be compatible with cationic dyes and dyes, dye formulation difference should be less than 0.5.

2 leveling agent selection and improper dosage

The acrylic leveling agent can be divided into two categories: retarding and levelling agent dye leveling agent

A. retarding levelling agent called retarding agent, retarding leveling agent retarding principle is as follows: at the time of dyeing, dyeing retarding agent to occupy the seat, with the temperature gradually increased, retarding agent was dye substitution, combined with fiber, achieve the purpose of leveling.

Precautions for use of retarding agents:

If less dosage, leveling effect is not good, easy to create color flowers. If the amount is too much, it will cause color flower.

As the most critical temperature of dyeing acrylic fiber is about 90 degrees. If the amount of PAN is appropriate, 20 minutes can be maintained at a constant temperature of 90 minutes. If too much, it will cause an increase in dyeing temperature, dyeing speed, resulting in colored flowers.

The Zhuang Jie cationic levelling agent ZJ-CH13 as an example, in general, dark light in the dosage of 1g/l, dosage of 0.2-0. 5g/l.

B. dye leveling agent: it has the performance of migration, migration, migration to dye from place to place the deep color and light color.

3 material variance

The company production of acrylic fiber, dyeing properties are different, such as: acrylic paint Shanghai Jinshan Chemical Factory, Lanzhou Petrochemical Acrylic color slowly, so it brings great difficulties to the dyeing factory.

4 improper temperature control

Generally speaking, acrylic start painting from 80 degrees, 87-92 degrees between the key stage is colored, during which must slow heating speed between 1 DEG /3 DEG C for /6 minutes ---1 minutes. It is best to keep warm for 20 minutes at a temperature of 90 degrees

5 pH change

Acrylic dyeing, the pH value should be within 3.5 - 5.5. PH value is low, the dyeing speed is slow, not easy to dye flowers. However, the pH value is too low, poor color fastness. The pH value is high, with fast speed, high yield. But when PH is too high, easy to dye flowers, if the PH is higher than 6, may also cause discoloration.

In general, the pH value of dyeing acrylic master in 4.5. Dyeing acrylic with acetic acid, in order to ensure the whole process of dyeing pH stabilized in the dye bath adding sodium acetate as pH buffer, the dye process does not change with the PH floating, achieve the leveling effect. The amount of sodium acetate is 0.5g/l.

6 water quality impact

The dyeing of acrylic fibers to use soft water, the total hardness is below 75PPM. If the hardness of the water is high, it will cause the flowers. Some dyeing plants often appear to be stained with flowers, may be caused by too high hardness of water.

To sum up; compared with other fiber dyeing dyeing acrylic fibres. Difficulty is higher, the process, the factors considered more. How to develop an optimal dyeing process, the proposed laboratory repeatedly proofing process.

Normal atmospheric temperature

The heating process is a common dyeing process. Customers can be adjusted according to the type of cloth and yarn. For example:

The weight of small cloth to slow heating, fast heating some weight.

The yarn heating should be slow, low yarn temperature can be faster.

Dark temperature can be faster, light temperature to slow down

The dark at 98 DEG C for long time, 45 - 60 points, but only light

Heat preservation for 15 minutes.

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