The main function of polyester masterbatch is coloring, its color and color fastness must meet user requirements, and its quality must also meet the requirements of polyester spinning and post-processing technology, that is, the addition of masterbatch will not affect polyester. Spinnability and physico-mechanical and wearability of dyed fibers. For the masterbatch manufacturer, the detection is a basic estimate of the quality of its own products, and for the user, it provides a scientific basis for the use of color masterbatches. The following items should be checked.

1. Appearance. The masterbatch is required to be uniform in particle size, free of powder, debris and super-long particles.

2. Bulk density (g/cm). It is required to be stable and accurate, and the particle size should be as consistent as possible with the spinning raw material slices.

3. Moisture content. Moisture is a very important indicator for polyester spinning, and users generally re-measure the moisture content of the masterbatch before spinning. However, in order to facilitate the user to add the amount of water according to the moisture content budget of the masterbatch, the masterbatch manufacturer should also detect the moisture content of the product before leaving the factory.

4. Color content. For conventional standard masterbatches such as black, accurate color content is an important basis for users to determine the spinning dilution ratio, while for custom-made masterbatches, the color content is only a reference, and the more important thing is the accurate dilution ratio.

5. Melting point and softening point. The melting point is not an important indicator of the quality of the masterbatch and its spinnability, but it is an important basis for the user to determine the spinning and drying process conditions.

6. Polyester discoloration temperature (or thermal stability). An important basis for whether the masterbatch can adapt to the spinning process conditions.

7. Sublimation fastness of polyester masterbatch. It refers to the property that the pigment in the masterbatch directly turns into a gas to escape the carrier due to heating. Due to the difference in the sublimation fastness of the dyes, the color tone of the formulated color may change, and the user's equipment may also be contaminated by the sublimated dyes. This is an index that must be considered by masterbatch manufacturers when selecting dyes, and it is also an important index to characterize the performance of masterbatches.

8. Color fastness. An important indicator of whether the masterbatch can meet the basic needs of users. However, for pre-spinning coloring, each dye must be selected strictly or even extremely harshly before use, and its dyeing mechanism is to form a uniform solid solution on the inside and outside, which is stronger than the general conventional dyeing method. are at least one level higher. Therefore, under normal circumstances, the color fastness of pre-spun dyed fabrics will not be a big problem. As long as the masterbatch manufacturer pays attention to accumulating the color fastness data of each dye and each ratio, and has an accurate and reliable basic estimate of the color fastness of the batch of masterbatches, it is not necessary to test this indicator for each batch number.

9. Ash content of polyester masterbatch. This indicator is mainly used to detect the content of inorganic salts and mechanical impurities in the masterbatch, but has no characterization significance for the coarse particles of pigments in the masterbatch and agglomerated particles in polyester. Practice has proved that the size of ash can predict and characterize the filtration performance of masterbatch to a certain extent.

10 polyester masterbatch.DF value (or △P curve). It is used to measure the comprehensive actual filtration performance of the masterbatch, and its value can predict the replacement cycle of the user's spinning components.

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