What are the reasons for the frosting of PET Self Wrap Braided Sleeve?

In fact, the frosting of the PET Self wrap braided sleeve mainly includes the frosting on the surface of the rubber material and the frosting on the surface of the finished product. The main causes of frosting are:

(1) Improper formula design
1. Saturated spray: Commonly found in sulfur, accelerators, active agents, and anti-aging agents.
2. Migrating ejection: common in processing aids, migrating anti-aging agents, and antistatic agents.
3. Generating ejection: it is commonly used in sulfur vulcanization system as accelerator and reaction product.
4. Reaction retention: common in organic peroxide vulcanization system with excessive low molecular weight substances.
5. Stress ejection: common in inorganic fillers: such as calcium carbonate.
(2) Improper process operation
1. Uneven mixing results in poor dispersion and partially exceeds saturation.
2. The temperature of rubber mixing is too high, so that the compounding agent is locally excessive.
3. Inaccurate weighing.
4. If the vulcanization temperature is too high, polymer degradation will cause blooming. The vulcanization temperature is too low, resulting in incomplete reaction and insufficient sulfur blooming time, resulting in insufficient sulfur blooming.
5. Improper operation of the sprayed mold release agent or mold washing water causes the surface of the PET Self Wrap Braided Sleeve to turn white.
(3) Fluctuations in the quality of raw materials
Due to different origin materials, different production methods, different processes, and different batches of raw materials, there are great differences in the raw rubber synthesis process: differences in polymerization temperature, catalysts, synthetic monomers, etc., resulting in differences in solubility. Changes in purity, moisture, ash, pH, physical properties, etc.
(4) Poor storage conditions
1. Temperature: The solubility of the compounding agent in the Pet Self Wrap Braided Sleeve generally rises and falls with the rise and fall of temperature.
2. Time: The pressure on the PET Self Wrap Braided Sleeve during storage, the humidity of the surrounding air and time also have an impact on the solubility of the compounding agent, and generally have little impact. However, if the pressure is high, the compounding agent in the PET Self Wrap Braided Sleeve at the pressurized part will form a crystal nucleus and precipitate on the surface of the PET Self Wrap Braided Sleeve, forming frosting; if the humidity of the air is too high, the PET The highly polar compounding agent in the self-wrapping braided sleeve weakens the effect on the raw rubber (non-polar), and the solubility of the compounding agent decreases, resulting in frosting; the longer the storage time, the more frosting on the surface of the PET self-wrapping braided sleeve Obviously, since the temperature and humidity of the air in the storage environment vary with the seasons, and the difference is large, it is very easy to cause the solubility of the compounding agent to change, resulting in blooming.
(5) Aging of PET Self Wrap Braided Sleeve
The aging of PET Self Wrap Braided Sleeve mostly leads to the destruction of the complete and balanced network structure of the vulcanizate, which also destroys the chemistry between various compounding agents and raw rubber molecules and compounding agents in the PET Self Wrap Braided Sleeve system. The physical or physical combination reduces the solubility of the compounding agent in the PET Self Wrap Braided Sleeve system. Therefore, those compounding agents that are partially in a supersaturated state will be separated out from the PET Self Wrap Braided Sleeve to form blooming.