Only the epoxy coating can be used on the inner wall of the food packaging barrel.
The safety of the inner wall coating of food packaging barrels is not sloppy - with the expansion of the definition of food safety, countries have increasingly increased the requirements for food and agricultural product packaging. Many foods and agricultural products used in the international market are packed in steel drums, and the hygienic requirements for the paint on the inner wall have attracted wide attention from all countries. As early as the 1950s, the US FDA required a high degree of attention to the detection of food and agricultural packaging drums. In order to meet the needs of the international market, China has also made specific provisions on sanitary requirements for the export of food and agricultural product packaging barrels. Food grade coatings on the inner wall of packaging drums are permitted according to regulations, mainly epoxy/polyamide coatings, as well as peroxyethylene coatings, organic fluorine coatings, etc. Experts reminded that at present, China's internal coating steel drums for food and agricultural products generally include honey barrels, juice buckets, ketchup barrels, etc. If used for the inner coating of inner coating drums for these foods, the sanitary quality is not up to To the safety food hygiene requirements, it will cause secondary pollution to food.
Epoxy/polyamide coatings are epoxy-based coatings, and epoxy-based coatings are also cured film-forming coatings. The epoxy resin is generally formed by polymerizing bisphenol A (diphenol propane) and epichlorohydrin. The molecular weight of the epoxy resin varies depending on the degree of polymerization. From the hygienic point of view, the larger the molecular weight (ie, the smaller the epoxy value), the more stable, and the less likely the harmful substances are dissolved to migrate into the food, so the safety is higher. As a curing agent for epoxy resin coatings, polyamide itself is a high molecular compound, and no toxicity has been reported. The quality of the epoxy-cured epoxy resin (epoxy value of the epoxy resin) is closely related to the ratio of the curing agent and the degree of curing. The higher the degree of curing of the curing agent, the less the amount of uncured material that migrates into the food in the epoxy resin coating. According to the provisions of GB9686-88 "Sanitary Standard for Polyamide Epoxy Resin Coatings on Inner Walls of Food Containers", the evaporation residue of polyamide epoxy resin coatings in various solvents should be controlled below 30mg/l.
The perchloroethylene coating is made of perchloroethylene resin as a raw material, and is mixed with a plasticizer. After being coated or sprayed, the inner wall of the drum is naturally dried to form a film. Perchloroethylene coatings are generally classified into primers and topcoats. The perchloroethylene resin contains a vinyl chloride monomer, which is a carcinogenic toxic compound. The perchloroethylene coating after film formation may still contain residual vinyl chloride. According to GB7105-86 "Sanitary Standard for Perfluoroethylene Inner Wall Coatings for Food Containers", the residual vinyl chloride monomer in the perchloroethylene coating after film formation should be controlled. Below mg/kg. Additives such as plasticizers and solvents used in perchloroethylene coatings must comply with the relevant provisions of GB9685-94 "Sanitary Standards for the Use of Auxiliaries for Food Containers and Packaging Materials". Do not use toxic or highly toxic additives. The coating film is required to be uniform, free of bubbles, spots, wrinkles, and shedding. Organic fluorine coatings include polyvinyl fluoride, polytetrafluoroethylene, and polyhexafluoropropylene coatings. These coatings are polymerized with vinyl fluoride, tetrafluoroethylene, and hexafluoropropylene as the main raw materials, and are coated with certain additives and sprayed in the packaging drum. The inner wall surface. The organic fluorine coating has the characteristics of anti-sticking and corrosion resistance, but its acid resistance is poor, so it is widely used in the inner coated steel shackles containing honey.
In terms of application, the organic fluorine coating on the inner coated honey steel drum is polytetrafluoroethylene, referred to as PVF coating. It is a kind of polymer compound, chemically stable, and generally does not have monomer residue. It is a safer inner wall coating for food packaging barrels. However, when cleaning the inner wall of the steel drum of the packaging drum, most of the current barrel manufacturing enterprises use the spray cleaning and drying line for cleaning. The cleaning agent is usually chromate, which may cause the chromium salt to remain on the surface of the container and be mixed into the inner coating. Therefore, in the production of honey-coated steel drums, the inner coated honey-coated steel drums should be inspected in accordance with GB1167-89 "Sanitary Standard for Polytetrafluoroethylene Coatings on the Inner Wall of Food Containers". The standard stipulates that the appropriate amount of chromium and fluorine should be controlled below 0.01 mg/l and 0.2 mg/l, respectively. In addition, when PTFE is baked, if the temperature reaches 280 ° C, fission occurs, resulting in highly volatile toxic fluoride. Therefore, when using Teflon coated honey to wrap steel drums, the general baking temperature should not exceed 250 °C.
In recent years, fruit juice, ketchup, honey, etc. exported from China have been reported to have been returned abroad due to excessive pesticide content.
As a food packaging drum, the residual amount of the coating solvent on the inner wall should be as low as possible. Therefore, when producing packaging drums in food, it is necessary to ensure that the food packaging drums are clean and the amount of harmful substances does not exceed the hygiene standards in accordance with food safety and hygiene requirements. To this end, an interlocking supervision system should be formed. The enterprises that use the food packaging barrels should obtain the food safety and hygiene inspection report of the packaging barrels from the packaging barrel manufacturer; the packaging barrel manufacturer should obtain the food safety of the inner wall coating from the coating supplier. Health inspection report. At the same time, the relevant departments should also regularly supervise and inspect the food packaging barrels and issue inspection reports. The packaging drum as food must meet the safety and hygiene standards of food. In recent years, the fruit juice, ketchup and honey exported by China have always been unable to obtain entry qualifications because of excessive pesticide content, and even after being placed at the port for a long time, they are eventually returned to the domestic embarrassing situation. Therefore, as a food packaging barrel, in addition to meeting the basic requirements of food hygiene, it must also require that the residual amount of solvent should be as low as possible. This requires that the production enterprises of food packaging barrels must comply with food safety and hygiene requirements when producing packaging drums in food. It is confirmed that the cleaning and residual harmful substances of food packaging drums do not exceed the hygiene standards.
Source: China Food Industry Network
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