In our lives, TPE material products are common, such as door and window seals, shower heads, folding basins, foot mats, sandals, bottle stoppers, brushes, toothbrushes, slipper racks, household bowls, fresh-keeping box lids, glass cleaners, ......and so on are TPE products, which have a wide range of applications. However, in the process of production and manufacturing of TPE materials, due to various reasons, TPE materials sometimes have color migration. So do you know what causes color migration in TPE materials? Here's what you know:
Causes of color migration in TPE materials:
In the process of modification of TPE materials, some small molecular weight additives are sometimes added, but the compatibility of such additives with the matrix material is poor, and the general addition amount is 2 3If the dosage is excessive, the small molecule will be extended over time and migrate.
The reason for the migration is that the temperature of the TPE material is higher when it is compounded and modified, and the additives can be better compatible in the blending system (the dissolved amount is more). When the compounding modification is completed, the temperature is reduced to normal temperature, and the dissolved amount of the additive in the modified system will be reduced. Over time, these small molecules will gradually migrate to the surface of the TPE product. If the three colors are made of the same material, the toner migrates with the oil molecules.
Solutions for color migration in TPE materials:
Due to compatibility, dispersion, and uniform base oil filling, the working oils and lubricants introduced in the TPE blend may migrate and settle onto the product surface, resulting in darker and more variable colors of the TPE material. Pay attention to the oil filling and locking of the system, and pay attention to the amount of small molecule additives.
If it is because of the large temperature change caused by the color difference, the inorganic color powder is easy to exceed the standard heavy metals, and the organic color powder does not contain heavy metals, but the temperature difference is large (more than 10), which is easy to cause discoloration. At this time, we should try to control the stability of the molding temperature of the TPE material, so as to solve the problem of color migration of the TPE material.
In summary, it is the cause of the color migration of TPE materials and the corresponding solutions. When the cause of color migration of TPE materials, you can first take the above methods to solve it, if it is really not solved, it is recommended that you can consult professional TPE manufacturers for help.