Analysis of Original Dyes
The original dye analysis mentioned here refers to the testing and analysis of the physical and chemical properties of the original dye for the needs of dye processing. After years of research, it has been found that post-treatment is by no means a simple physical process. Before processing the dye, it is necessary to analyze many indicators such as the intensity, shade, hydrophilicity, crystal form, energy level, and impurity content of the original dye to determine Provide basic data with reasonable processing technology.
After the dye is synthesized, the original dye filter cake is provided for the post-processing workshop through liquid-solid separation. After receiving the filter cake, the post-processing workshop first tests the original dye.
Different dye varieties, different synthetic processes, even different manufacturers of the same variety, different production batches of the same manufacturer, product quality may have some differences, each batch of dyes must be fully tested, only in this way can a set Correct processing method.
The so-called dye processing aids are added in the post-treatment process of dye processing to help improve the performance of specific dye commercial formulations (such as dispersibility, thermal stability, dust resistance, anti-agglomeration, and solubilization, etc.) or help increase the yield. Substances with fixed properties (such as level dyeing, dyeing promotion, deepening, etc.) and dyeing properties (such as color fixation, softness, etc.) on the fiber, enhance heat resistance, maintain or improve dispersion stability, prevent dye aggregation, and help It is a substance that improves the levelness of dyeing.
Commercial processing is inseparable from additives, and the processing formula cannot be optimized without understanding the properties of processing additives. The correct use of additives can improve the quality of dyes, reduce production costs, and increase the added value of dyes.
Processing equipment (post-processing equipment) is an important means to complete post-processing operations. Reasonable design and selection of processing equipment are the first conditions for successful completion of post-processing operations. It can be said that the development of post-processing technology is inseparable from the advancement of equipment.
In other words, the development of equipment is also driving the continuous development of post-processing technology. In dye processing, the use of ultrafiltration and reverse osmosis membranes plays an important role in the desalination of water-soluble dyes and the improvement of purity. The development and application of ultra-fine grinding equipment can reduce the particle size of the dye to about 1μm. The application of drying technology and equipment is also very extensive. At present, there are many drying equipment professional manufacturers engaged in the development and research of dye drying equipment, and an independent industrial department has been formed. Domestic drying equipment can basically meet the needs of dye drying.
The processing technology is a comprehensive application of the above three parts. Practice has proved that the same original dyes, auxiliaries and equipment, using different processing techniques to obtain completely different results, we can see the importance of process conditions. It is not difficult to see from the above introduction that these four aspects mark the technical level of post-processing.
Many large foreign companies have their own professionals engaged in research in this area, and some even have more personnel engaged in post-processing technology development than synthesizers. If the post-processing technology is reasonable, the purpose of reducing production costs, protecting the production environment, and improving product quality can be achieved.
These four factors are interrelated and restrict each other, and none of them are indispensable. It can be considered that the comprehensive application effect of the above four factors is a concrete manifestation of the level of post-processing technology.