People often pick up a plastic bag and use it to hold food, but they don't realize that this is very harmful to human health. For example, polyvinyl chloride plastic is toxic. Although polyvinyl chloride resin is non-toxic, the plasticizer added in the plastic manufacturing process is toxic, and the stabilizer added is also toxic. Therefore, when packaging food, special food packaging bags
must be used and must not be used indiscriminately. The following points should be paid attention to during use: 1. Lead salt will precipitate when polyvinyl chloride products come in contact with solvents such as ethyl alcohol ether, so use polyvinyl chloride plastic It is not suitable to store alcoholic food. 2. When PVC plastic encounters oily food, the lead in it will dissolve into the food, so it is very unsuitable. 3. When the use temperature of polyvinyl chloride plastic is higher than 50℃, it will slowly release HCI gas, which is very harmful to human health. 4. Bakelite (phenolic plastic) and electric jade (urine-formaldehyde plastic) used at higher temperatures will produce harmful free monomers, phenol, formaldehyde, urea and other toxins, and they are not suitable for food packaging and containers. 5. Waste plastic recycling products, due to the complex source of raw materials, inevitably contain toxic ingredients, so they should not be used as food packaging. The packaging plastics that people use daily are generally without additives, such as polyethylene and polypropylene. Food bags, oil drums, fast food boxes, etc. made of these materials are non-toxic. How to identify whether it is toxic in commonly used plastic products? There are many identification methods, such as appearance method, specific gravity method, boiling water method, combustion method, etc., the relatively simple, easy and accurate method is the combustion method. The brief introduction is as follows: Cut off a sample, clamp it with tweezers, and burn it on a lit alcohol lamp (if an alcohol-free lamp can also be replaced by a lit candle), then observe the burning difficulty, the situation after leaving the fire, the flame and smoke Color, burning phenomenon, and odor, etc., can be known by comprehensive judgments. Polyvinyl chloride plastic: non-flammable, it will extinguish after leaving the fire. The flame and smoke are green at the bottom and yellow at the tip. After the fire is extinguished, there will be an irritating smell of hydrochloric acid gas. Polyethylene plastic: flammable, after burning away from the fire, the flame and smoky bottom blue top yellow, when burning, there is continuous dripping of molten material, giving off the smell of paraffin. Polypropylene plastic: It is combustible and will be burned after leaving the fire. The flame and smoke are orange-yellow. When burning, there will be continuous dripping of dissolved substances and the smell of petroleum. Polystyrene plastic: flammable, burns after leaving the fire, the flame is orange-yellow and emits black smoke, and the black carbon powder is flying into the air, and it has the odor of styrene. Phenolic plastic (baked wood): It is non-flammable, it will go out after leaving the fire, the flame is yellow, and it will expand and crack when it burns, giving off the irritating smell of phenol. Urine aldehyde plastic (Electric jade): It is non-flammable and extinguishes when it leaves the fire. The flame is yellowish, swells and cracks when it burns, and emits a pungent urea smell.
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