Why do you have yellow notes in your notebooks after softening fabrics from May to June each year?

Since many dyeing plants directly use river water for pre-treatment , dyeing, and finishing, a series of problems have emerged, the most of which is the appearance of yellow spots on the surface of soft cloth after softening, especially in May-June. .

Therefore, we conducted the following tests using river water, well water, tap water, and pure water in order to understand how the water quality changes the whiteness of the soft tissue after fabric finishing, and how we can minimize this situation.

Second, the experimental process and methods:

We use untreated river water, well water, tap water, and pure water respectively to turn all-around film S200, all-around film S300, film film 330, non-ionized film V12, amphoteric film V100, anion film 2316, and naphtha 222 in a 1:19 ratio. After doing a soft, stability test.

2.1 Soft Finishing Experiment:

After the film was opened and diluted with river water, well water, tap water, and pure water, the same amount of 10% (owf) was used as a softening test to observe the condition of the cloth after baking.

2.2 Prepare a 5g/l working solution with different water quality and different films to observe the stability of the initial formulation and two hours later.

Three experimental results:

3.1 With the use of river water as a softening finishing test, most of the macules appear on the surface of the cloth. After the non-ionizing film V12 and the anionic film 2316 were finished, the macula was significantly less than other films. With tap water, pure water, and well water, there is no macula.

3.2 Stability results for different water quality working fluids:

The non-ionized film V12 and the anionic film 2316 have good working fluid stability in the river water, while for other films, the working fluid prepared with river water produces yellow floc, and the tap water and well water are formulated to produce white floc, with pure Water formulated working fluid is stable over a long period of time.

3.3 The results of different water quality soft finishing whiteness test results:

IV. Analysis and Suggestions:

4.1 Based on the above analysis (for reference only): The cationic film working solution is not stable in the river water, indicating that it is flocculated with microorganisms in the river water to produce yellow floc, which sticks to the fabric, after drying and shaping. The yellow spots will form on the fabric, so you can know why it is particularly prone to quality problems in May-June when the temperature is more suitable for algae breeding, and it is rarely seen in autumn and winter.

4.2 It can be known from the experimental results that the quality of the water has a great influence on the stability of the formulated soft working fluid and the whiteness of the fabric after softening. Therefore, the printing and dyeing plant uses the treated water as much as possible.

4.3 Some manufacturers still use similar conditions when using activated carbon filtered water. This is because the microorganisms are very small and the activated carbon cannot be completely adsorbed and filtered. Therefore, a cationic surfactant is added to the sedimentation tank before water treatment to make it Flocculation of microorganisms in water and filtration by activated carbon can improve the effect of water treatment; in addition, activated carbon must be regularly cleaned or replaced. If the above method is not feasible or still can not eliminate quality problems, it is recommended that the factory use non-ionic, anion soft film or non-ionic film spelled with silicone oil for handy finishing when algae flourish.

4.4 In the manufacturers with more macular production, no such situation occurred with aminosilicone oil finishing. The specific conditions of silicone oil in different water quality are to be experimentally verified.

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