In the face of these parents and students most concerned about the question, the answer you look down!
More than 1.94 billion plastic book covers are used every semester
Toxic? non-toxic? I dont know what to do
Is there a problem with the plastic cover? In response to this problem, the reporter interviewed some students and parents. However, most people expressed concern, but did not know the answer to the question. Some people think that plastic book covers are poisonous, while others think that only part of them are poisonous.
Reporter: most book covers on the market may be poisonous. Do you think this is true or false?
Jiang Xitong: I think its half true.
Gao Yueying: I dont know.
Li Dan: plastics are really poisonous.
Xie Haiying: half true and half false. There are some qualified products.
Reporter investigation: there are many kinds of plastic book covers, and the price difference is not big
The reporter visited some stationery shops and found that the common plastic book covers on the market are mainly polypropylene PP, polyethylene PE and polyvinyl chloride PVC, among which polypropylene PP material is the most. The type of book cover is divided into self-adhesive type and wrapping type.
Stationery shop owner: there are some small brands in the delivery area. I dont take them either. There are big price differences. The good ones are expensive. The price difference is almost double.
Stationery shop owner: we dont divide that (material), we only divide brands.
Expert interpretation: book cover plasticizer does not mean toxic.u201c
Online articles about plastic book covers are toxic repeatedly mention a toxic substance called phthalate, which is actually a traditional plasticizer.
So, is there plasticizer in the plastic book cover? The reporter bought PVC and PP self-adhesive and wrapped book covers from physical stationery stores and online stores, and sent them to Beijing University of Chemical Technology for comparative test.
Infrared spectrometer can be used for qualitative analysis of plastic products. The comparative test results show that no plasticizer is found in PP book cover, but a small amount of plasticizer is found in PVC book cover. Experts explained that PP material itself is very plastic, no need to add plasticizer, but PVC material molecular force is too strong, must add plasticizer.
Zhang Liqun, vice president of Beijing University of Chemical Technology: at present, many of our new plasticizers are considered to be of low toxicity. Some of them are obtained from chemical modification of traditional plasticizers. It is likely that this plasticizer will contain a small amount of traditional plasticizers. Therefore, when using this new plasticizer, our enterprises must control the content of toxic and harmful plasticizers in the products within the scope of national and international regulations.
Zhang Zongbo, associate researcher of the Key Laboratory of extreme environmental polymer materials, Chinese Academy of Sciences: the toxicity is obviously a relative concept, including plasticizers, phthalates, and polycyclic hydrocarbons. Even if it is contained, it is harmless to human body under a certain limit.
In the experiment, the experts found the adhesive in the self-adhesive book cover. Experts remind that adhesives may also have harmful substances that affect human health, such as volatile organic compounds, toxic curing agents, etc.
Professor Xue Jiajia, School of materials science and engineering, Beijing University of Chemical Technology: for self-adhesive type, in addition to the matrix material PP is polypropylene, or EVA, we also found other adhesives.
Therefore, as long as the qualified products produced by regular manufacturers can be assured to use, parents should try to buy PP material cover.