Polyva brings you the toxicological introduction of PET raw materials-technical knowledge

Polyva brings you the toxicological introduction of PET raw materials. Source: Protective film factory direct sales Release time: 2019-05-03 Click: 1209 The raw materials involved in PET synthesis, terephthalic acid, ethylene glycol, and antimony catalysts are all harmful to the human body. Health has a certain impact, the specific hazards are introduced as follows. Terephthalic acid: It is a white, loose crystalline powder at room temperature, non-toxic and flammable. Irritating to eyes, mucous membranes and upper respiratory tract. Ethylene glycol: It is a low-toxic substance. Inhalation of heated ethylene glycol vapor or accidental drinking of ethylene glycol can cause acute poisoning; if long-term inhalation of glycol vapor, chronic poisoning will occur. The rat LD50 is 5.5~8.54mL/kg, and the human oral LD50 is 80~100g. The concentration of ethylene glycol in the blood reaches 2.4g/L, which can cause acute renal failure. The manifestations of inhalation poisoning are confusion, nystagmus, protein, calcium oxalate crystals and red blood cells in the urine. Antimony catalysts: Antimony catalysts are the most commonly used catalysts in polyester production. They mainly include antimony trioxide, antimony acetate, and antimony glycol, all of which are white crystalline powders. Antimony acetate and antimony glycol will decompose into acetic acid and antimony oxide fumes when heated. Antimony oxide fumes are highly toxic and can cause gastrointestinal disorders, vomiting, diarrhea, and neurological diseases. Food contact PET hygiene and safety requirements related laws and regulations introduced PET film has excellent physical and chemical properties, such as high strength, good transparency, non-toxicity, good barrier properties, and excellent electrical insulation properties, so it is widely used in the field of food packaging. However, its monomers, catalysts and other additives, including by-products, are highly toxic substances, and there is a risk of migration. Countries around the world have formulated corresponding standards for the hygiene requirements of PET for food contact.