According to the China Plastics Processing Industry Association statistics, the annual output of China's limbs industry reached 400,000 t. Melamine tableware exports more than 1 billion US dollars, accounting for more than 80% of the international market share.

As the production of raw materials containing melamine formaldehyde, such as in the manufacturing process is not properly controlled, in the course of the use of formaldehyde monomer precipitation. Formaldehyde is a cell protoplasm toxicant, into the human body can make the protein coagulation, destruction of cell protein, damage to the liver and kidney 131, priority list of toxic chemicals in China ranked second. Formaldehyde has been identified as a carcinogen by the International Cancer Institute, 10g can cause death as close contact with food important food contact material a melamine tableware, in recent years, its formaldehyde migration problem has also been increasingly concerned about all sectors. In this paper, the effects of various types of soaking solution, such as acidity, wateriness and oiliness, were studied. The effects of immersion temperature, soaking time, fragmentation degree and microwave heating time on the migration of formaldehyde were studied. The migration behavior of formaldehyde monomer was discussed.

Materials and methods Main materials and reagents Formaldehyde standard solution (national standard center, analytical grade), acetone acetone, acetic acid, ethanol, acetic acid according to the analysis of pure water for the distilled water.
Ingredients: Weigh 150 g of acetic acid in an appropriate amount of water, draw 3 mL of acetic acid and 2 mL of acetone acetone, and set the volume to the IL volume bottle with deionized water.
The main equipment and equipment Varian Cary50 UV-visible spectrophotometer, constant temperature water bath.

For cups, bowls, plates and other dishes can be filled with liquid, the use of direct immersion method, the soaking liquid into the tableware to the volume of 3 / 4-4 / 5. For spoon, plate, dish and other dishes can not be filled with liquid, Samples were cut into a certain area of the plate, placed in a glass beaker, according to 6dm2 solution in the proportion of 1L solution soaking.

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