Melamine Bar KTV Snack Plate Creative Tableware
Material: Melamine Pattern: Plant Flower Style: Chinese Origin: Mainland China Size: 6 inches Quantity: 1 tea tableware Craft: Glaze
Melamine tableware belongs to high molecular polymer, English abbreviation is MF, its monomer is formaldehyde and melamine. A 37% aqueous formaldehyde solution was used for the reaction, and the molar ratio of formaldehyde and melamine monomers was 2 ~ 3.
Studies have shown that with the increase in the amount of formaldehyde, the combined amount of formaldehyde also increases, and the reaction is easy to proceed; changing the amount of formaldehyde can produce melamine resins obtained from different methylolmelamine. When the pH of the reaction system is 8.5, side reactions Less, the reaction is easy to control; high temperature, fast reaction speed, in the range of 54 ~ 80 ℃ has little effect on the amount of formaldehyde binding.
In the first step of the reaction, different numbers of N-methylol substituents are generated, and then further condensed into linear resins. Generally speaking, the reaction conditions are different, and the molecular weight of the product is also different, from water-soluble to insoluble in water, and even insoluble and infusible solids can be formed. Melamine resin does not cure at room temperature and generally needs to be thermally cured at 130 to 150 ° C. Studies have shown that adding a small amount of acid as a catalyst during curing can increase the curing rate. The cured melamine formaldehyde resin is colorless and transparent, stable in boiling water, and can even be used at a high temperature of 150 ℃. It has self-extinguishing, arc resistance and good mechanical properties.
Melamine tableware belongs to high molecular polymer, English abbreviation is MF, its monomer is formaldehyde and melamine. A 37% aqueous formaldehyde solution was used for the reaction, and the molar ratio of formaldehyde and melamine monomers was 2 ~ 3.
Studies have shown that with the increase in the amount of formaldehyde, the combined amount of formaldehyde also increases, and the reaction is easy to proceed; changing the amount of formaldehyde can produce melamine resins obtained from different methylolmelamine. When the pH of the reaction system is 8.5, side reactions Less, the reaction is easy to control; high temperature, fast reaction speed, in the range of 54 ~ 80 ℃ has little effect on the amount of formaldehyde binding.
In the first step of the reaction, different numbers of N-methylol substituents are generated, and then further condensed into linear resins. Generally speaking, the reaction conditions are different, and the molecular weight of the product is also different, from water-soluble to insoluble in water, and even insoluble and infusible solids can be formed. Melamine resin does not cure at room temperature and generally needs to be thermally cured at 130 to 150 ° C. Studies have shown that adding a small amount of acid as a catalyst during curing can increase the curing rate. The cured melamine formaldehyde resin is colorless and transparent, stable in boiling water, and can even be used at a high temperature of 150 ℃. It has self-extinguishing, arc resistance and good mechanical properties.
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