People often pick up a plastic bag to hold food, but it is very harmful to human health. For example, polyvinyl chloride plastic is toxic. Although the polyvinyl chloride resin is non-toxic, in the process of manufacturing plastics, the added plasticizer is toxic, and the added stabilizer is also toxic. Therefore, when packaging food, you must use special food packaging bags, and must not be used indiscriminately. Everyone should pay attention to the following points during use:
1. When the polyvinyl chloride product is in contact with a solvent such as ethanol ether, lead salt is precipitated, so it is not suitable to store the alcoholic food with polyvinyl chloride plastic.
2. When PVC plastics meet oily foods, the lead will dissolve into the food, so it is not suitable.
3. When the temperature of PVC plastic is higher than 50 °C, HCI gas will be released slowly, which is very harmful to human health.
4. Bakelite (phenolic plastic) and electric jade (urinary aldehyde plastic) are used at high temperature, which will produce harmful free monomers, phenol, formaldehyde, urea and other toxins, and should not be used as food packaging and utensils.
5. Waste plastic recycling products, due to the complex source of raw materials, inevitably with toxic ingredients, it is not suitable for food packaging.
People's daily plastic packaging is generally without additives, such as polyethylene, polypropylene, food bags, oil drums, fast food boxes and the like made of these materials are non-toxic.
How to identify whether it is toxic in common plastic products? There are many methods for identification, such as appearance method, specific gravity method, boiling water method, combustion method, etc. The simple and accurate method is combustion method. Now Jiuzhi Plastics Network tells you about it:
Cut the sample one by one, clamp it with tweezers, burn it on a lit alcohol lamp (if you can use a lit candle instead of an alcohol lamp), then observe the burning, the situation after the fire, the flame and the smoke, and the burning The phenomenon, the emitted odor, etc., can be judged by what kind of plastic.
Polyvinyl chloride plastic: non-flammable, away from fire, the flame and smoke are green at the bottom, the tip is yellow, and the smell of hydrochloric acid is irritated after the fire.
Polyethylene plastic: flammable, separated from fire, flame and smoke, and the bottom of the blue is yellow. When burning, there is a continuous drop of molten material, which gives off a paraffin smell.
Polypropylene plastic: flammable, fire-following, flame and smoke are orange-yellow, there is a constant drop under the burning, there is a smell of oil.
Polystyrene plastic: flammable, burning from the fire, orange flame, black smoke, black carbon, flying into the air, styrene smell.
Urine aldehyde plastic (electric jade): It is flame retardant, it is extinguished after the fire, the flame color is yellow, and there is crack in the burning, which gives a pungent smell of urea.
Phenolic plastic (bakelite): It is flame retardant. It is extinguished after the fire, and the flame is yellow. When it burns, it will swell and produce cracks, which will give off the pungent taste of phenol.
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