Clamshell Blog

In daily life, in each of our families, plastic bags, plastic food containers has become commonplace in full bloom; in an array on the shelves of the store, placed in plastic food packaging everywhere. We all know full bloom for food packaging and plastic should be non-toxic. But sometimes people do not attach importance to this issue, readily took a plastic bags used to hold food to realize that this is harmful to the body. Because some plastics, such as polychlorinated ashamed vinyl plastic is toxic. Although non-toxic PVC, plastic products, but in the process of accession to the plasticizer dibutyl phthalate and lead are all toxic DOTP; Add stabilizer is also mainly lead stearate toxicity. Easily precipitated lead salt together, there will be set once the store into the body effect, poisoning people a long time, so use plastic food packaging and in full bloom exclusive use of food bags, boxes, must not be misused.
The use of plastic food packaging to note the following:
1. PVC products with ethanol, ether and other solvents precipitate when exposed to lead salt, so in full bloom with this soft plastic food is not suitable;
2. If the use of PVC products in full bloom oily foods such as fried fritters, fried cake, fried fish, snacks and the like will cause the spread of lead in plastic food to go;
3. PVC products when the temperature at 105 ℃, it will dissolve toxic substances, if long-term use in more than 80 ℃ will slowly release HCl gas that has toxic effects on the human body.
Also Bakelite (Bakelite) containing free phenol and formaldehyde on human toxicity, so Bakelite products are not suitable for eating utensils and food packaging. Xinhua Yu (urea-formaldehyde plastic), although a room temperature non-toxic and tasteless, but at 100 ℃ boiling water bubbles or for holding vinegar, there will be precipitation of free formaldehyde on human health, and should not be used for food packaging or a. Other products such as waste plastic recycling extremely complex and difficult to guarantee its non-toxic should not be used for food packaging.
One day be used as food packaging, plastic is generally without plasticizer and antioxidant species, such as polyethylene, polypropylene, polystyrene, nylon, they are non-toxic. Such as the commonly used food bag is made of polyethylene plastic, another example, bottles, cups, sugar bowl, tray, ladle, and lunch boxes are also using non-toxic plastic.
In the commonly used plastic products in identifying whether or how toxic?
Identify many ways, such as the appearance of law, the proportion method, solvent, boiling water immersion, combustion method. More simple, accurate and feasible method is combustion, are presented below:
The samples were cut out a small section to clamp the clamp, in the light of the kerosene lamp on (also available without the alcohol lamp lit candles instead of) view of their ease of combustion from the case after the fire, the color of flame and smoke, burning such phenomena and the odor can be integrated sub-word is what kind of plastic.
PVC: not flammable, away from the fire Jimie, the color of flame and smoke to the bottom of the green tip of the yellow, white fume burning softens, have brushed off later phenomenon, hydrochloric acid gas to stimulate the taste.
Polyethylene plastic: flammable, away from the fire continued to burn after the flame and smoke blue top yellow bottom, continue to melt dripping during burning, burning paraffin wax with a similar issue of taste.
Polypropylene: flammable, burning up from the fire, the flame color of the top end blue yellow, burning continuously melt dripping when there oil flavor.
Polystyrene: flammable, away from the fire continued to burn after the flame and smoke Secheng orange, black smoke, it is obvious that black carbon fly to the end of the air, given the unique odor of styrene.
Bakelite: flame from the fire and then turns off the flame and smoke color yellow, expansion cracks when burning issue of wood burned and the smell of phenol.
Urea-formaldehyde plastics: flame, after the Jimie from fire, flame and smoke color yellow, tip pale blue, burning and swelling when there are cracks, issued a sharp taste of urea and formaldehyde.
Nylon plastic: the slow burn from the fire put out after the slow, yellow flame, burning under the drip when the constantly melting and foaming, have similar taste burnt wool.