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Blowing refers to the phenomenon that a liquid or solid compounding agent is moved from the inside of the rubber to the appearance of the rubber to cause whitening of the rubber product. As a professional rubber processing manufacturer, we will introduce you to several common causes of rubber spray.
(1) Formulation is not appropriate:
Full squirting: common in sulfur, accelerators, active agents, anti-aging agents, relocation and squirting: common in processing aids, relocation anti-aging agents. Antistatic agent generated spray: common in sulfur vulcanization system accelerator and reverberation with reaction product: common in organic peroxide vulcanization system low molecular weight excess stress ejection: common in inorganic fillers: such as calcium carbonate.
(2) Technical operation is not appropriate:
Uneven mixing results in poor dispersion, partially surpassing fullness
The temperature of the rubber compound is too high, so that the compounding agent is partially excessive.
Inaccurate weighing (multiple, less, missing, wrong)
The vulcanization temperature is too high, and the polymer degradation constitutes a frosting
If the vulcanization temperature is too low, the vulcanization of the sulphur-inhibiting vulcanization is not complete, and the mold release agent or the washing water which constitutes the sulphur spray is not properly operated, which constitutes a whitish appearance of the rubber surface.
(3) The quality of raw materials is shaken because the raw materials are different, the manufacturing method is different, the technology is different, the batches are different, the raw materials are very different, the composition technology of raw rubber: the difference of polymerization temperature, catalyst, composition monomer, etc. Solubility is different. Purity, moisture, ash, pH, physical properties, etc. change.
(4) Poor storage conditions:
The solubility of the compounding agent in the rubber is usually raised and lowered following the rise and fall of the temperature (pressure and humidity): the pressure of the rubber during storage, the humidity of the surrounding air, and the solubility of the compounding agent at all times also have little effect. However, if the pressure is large, the compounding agent in the rubber of the pressed part will constitute a crystal nucleus, which is separated from the rubber surface to form a frosting; if the humidity of the air is too large, the compounding agent with a large polarity in the rubber is raw rubber ( The effect of non-polarity is weakened, the solubility of the compounding agent is reduced, and then the frost is caused; the longer the storage time, the more obvious the frosting of the rubber surface, because the temperature and humidity of the air in the storage environment are different from the changes of the season, and the difference is different. Large, it is easy to cause changes in the solubility of the complexing agent, and then cause the frost to bloom.
(5) Rubber aging
Most of the rubber aging causes damage to the well-balanced network structure of the vulcanized rubber, and then damages the chemical or physical relationship between the various compounding agents in the rubber system and the raw rubber molecules and the compounding agent, and reduces the compounding agent in the rubber. Solubility within the system. Therefore, those parts that are partially full will be freely separated from the rubber to form a frosting.learn more about rubber product.
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