Poured into the plastic bottle of pesticide temperature will be much higher than the ambient temperature. The general pesticide filling immediately after sealing tight. In order to avoid spillage or spillage when the pesticide is filled, the internal volume of the bottle should be at least 10% more than the volume of liquid to be filled. In other words, the hot filling of more than 10% of the bottle after the temperature of the air and pesticide is the same. When a period of time, pesticides and internal air to the ambient temperature, the bottle will be due to thermal expansion and contraction and liquid vapor of liquefaction caused by negative pressure. When the negative pressure exceeds the bottle wall strength, it will lead to plastic bottle wall retraction, deformation. Second, due to mutual solubility, weight loss led to deformation. In this case,
This deformation originates from the principle of the similar polarity of the chemical substance. When the polarity of plastic packaging bottles and packaging of EC pesticides are similar to the polarity of organic solvents, there will be mutual miscible. Over time, miscibility will develop into penetration. Organic solvents can escape from the molecular gaps in the bottle material of the bottle. A bottle of 100 milliliters of pesticide will become 90 milliliters, 80 milliliters, or even less after a certain period of time. So when the lid is sealed pesticide bottles, this leakage will lead to weight loss will inevitably produce negative pressure, and ultimately make the bottle deformation. In this case,
In general, when a high density polyethylene bottle (PE) is used to package aliphatic, or ester and ketone, or aromatic solvents; when PET bottles are packed with dimethylformamide (DMF) Layer coextrusion bottle for the polyvinyl alcohol (EVOH) packaging aromatic or ester and ketone solvents, will happen this kind of phenomenon. Third, due to negative pressure caused by oxidation deformation. In this case,
Pesticide composition is very complex, the ingredients contained in some special solvent, or emulsifier, or unknown raw materials in the impurities and the air will often remain in the air oxidation of oxygen, resulting in negative pressure generated Deformation. In this case,
This phenomenon, we have done a number of rapid aging test to be confirmed. If we put the 1.8% avermectin test pesticide in a plastic bottle, tighten the lid and open a small hole in the lid to connect with a U-shaped tube with some water.