Imitation porcelain tableware does not shoot fall, fall not afraid
09 Jan 2018
In recent years, imitation porcelain tableware (melamine tableware) prevails in the fast food industry and the children's catering industry. The red and black bowls in the noodle shop are typical representatives of imitation porcelain tableware.
Of course, there has always been a question of its safety ...
1 What is imitation porcelain (melamine) tableware
Imitation porcelain tableware, alias melamine tableware, is a resin-based raw materials processed appearance similar to the porcelain tableware. Imitation porcelain meal has a significant advantage, that is, fall resistance is not broken, there are wood! Ma Ma no longer afraid of breaking the bowl! In addition, it is lightweight and beautiful, non-toxic and tasteless, safe and convenient than the average plastic products, and stainless steel and porcelain dishes and other insulation more effective.
China's production of imitation porcelain tableware has a special standard requirements, the provisions must be melamine powder (ie, melamine-formaldehyde resin) as the substrate, α-cellulose as the base material production.
2 melamine and melamine formaldehyde resin
First of all, it needs to be clear that "melamine and melamine resin are two different substances!"
Melamine to melamine formaldehyde resin is like urea to urea formaldehyde resin (used in adhesives). Melamine formaldehyde resin is a polymer obtained by condensation polymerization of melamine and formaldehyde.
Melamine long, strong crowd
After melamine formaldehyde after the transformation, has become a new material!
Below, we come to know the main material of melamine tableware melamine formaldehyde resin (melamine resin).
❶ Introduction
Melamine-formaldehyde resin (MF), thermosetting resin made by polycondensation reaction of melamine and formaldehyde. It is customary to use urea resin and urea resin collectively referred to as amino resin. Colorless and transparent, light, boiling water resistance, non-toxic, self-extinguishing, good mechanical properties, stable performance at -20 ~ 100 ℃. Its products have the same pollution-resistant ceramic, which is widely used in making light cutlery.
Melamine - formaldehyde resin solution storage period is very short, in order to extend its shelf life, usually made by spray drying solid resin powder and isolated from air storage. 1935 German Heckel company began selling adhesives and coatings with melamine formaldehyde resin, the early 1980s the world annual output of 300kt.
❷ craft
At present, there are two production routes of amino molding compounds (including melamine formaldehyde molding compound, urea formaldehyde molding compound and urea melamine formaldehyde molding compound): one is the wet route adopted by most countries, and the other is the BUSS method . Two processes are quite mature, but the first line.
❸ application
a. Application in the leather industry
In the leather industry, melamine resin is commonly used in pre-tanning, retanning, filling resin, of which trimethylolmelamine resin is the most widely used amino resin. At present, the main melamine at home and abroad, dicyandiamide alone or in combination with formaldehyde condensation melamine resin tanning agent, and its proper modification as needed.
b. in the paper industry in the application
Due to melamine-formaldehyde resin containing methylol, etherified structure can be formed between the fiber bundles, which cross-linked to produce water resistance, the paper obtained moisturizing effect, it is mainly in the paper industry as wet reinforcement Agent, water repellent.
c. in the paint industry applications
Widely used in the coating industry is the melamine formaldehyde resin modified by etherification of low alcohols (such as methanol, butanol and isobutyl alcohol). It is mainly used as water-based paint crosslinking agent. It is used as one of top coat and primer Raw materials, and alkyd resin, polyester resin, acrylic resin, epoxy resin formulated into amino resin, widely used in automotive, furniture, home appliances and other industries.
d. Used as ceramic and cement dispersant
Melamine resin sulfonate is a very good anionic surfactant, both at home and abroad are often used as efficient dispersing agent in ceramic, cement and concrete or water-reducing agent. The current research focus in this area lies in two aspects:
First, reduce costs
As melamine resin water reducing agent is more expensive than naphthalene superplasticizer and is often supplied in lower concentration liquid, its application has been limited. The solution is mainly to use other cheap active part (such as urea) instead of melamine monomer, melamine resin superplasticizer by adding calcium and calcium, sodium gluconate admixture into a superplasticizer or made of high solid content Melamine resin water reducer.
The second is to explore the appropriate molecular weight of melamine resin water reducer, and in a long time to ensure the viscosity stability.
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