The production of PU foam toys is essentially a plastic […]
The production of PU foam toys is essentially a plastic made of polyurethane chemicals. To make polyurethane, two types of materials with at least two functions are required as reaction agents: compounds containing isocyanate functional groups and compounds containing active hydrogen atoms. The physicochemical properties, structure and molecular size of these compounds will react to polymerization, ease of processing and isocyanate. The primary process for producing isocyanate is the reaction of amine and phosgene. The raw material amine is produced by hydrogenation of corresponding nitrates. For example, toluene diamine (TDA) is produced from dinitrotoluene and then converted into toluene diisocyanate (TDI). Diaminodiphenylmethane or phenylmethane is produced from nitrotoluene. Benzene generates aniline, which is then converted to diphenylmethane (MDI). The two most important aromatic isocyanates are: toluene diisocyanate (TDI) and diphenylmethane diisocyanate (MDI). TDI includes 2,4-toluene Two isomers of diisocyanate and 2,6-toluene diisocyanate, the most important type is TDI-80 (TD-80), which contains 80% of 2,4-isomer and 20% of 2,6-isomer This kind of mixture is mostly used to make polyurethane flexible block foam and molded foam. TDI, especially crude TDI and TDI/MDI mixture can be used for rigid foam products, but slowly polymerized MDI Instead, TDI-polyether and TDI-polyester prepolymers are used in high-performance coatings and elastomers. When prepolymers are used, vacuum must be used to remove the TDI monomer. There are three types of diphenylmethane diisocyanate (MDI). The isomers, 4,4'-MDI, 2,4'-MDI, and 2,2'-MDI, can also be polymerized to complete and even enhance the functional properties of the third isomer and affect the physical properties of the ester after processing.
The following 6 characteristics of PU toy materials:
①Environmental protection, all selected raw materials are produced, (because of its non-recyclability, it is decided that its cost is relatively higher than that of plaster, wood, and resin), which effectively reduces forest logging, protects nature, and is pollution-free.
②Moth-resistant, moisture-proof, mildew-proof, acid and alkali resistant, non-cracking, not easy to deform, washable, and extremely durable.
③Fire protection, the product has passed the national B2 level inspection, and has the characteristics of non-spontaneous combustion and non-combustion support. It can be automatically extinguished when it leaves the fire source.
④Light weight, good hardness, excellent elasticity and toughness. It can be sawed, planed and nailed, and can be bent into various arc shapes at will. No need to reopen the mold. The construction is simple, and the time spent in construction is at least half the time spent on normal plaster and wood (the construction method is exactly the same as that of the wood). Precautions for construction: a glue b gun nail c cutting head should be inclined at 45 degrees to avoid shrinkage.
⑤Diversity, the product is factory-standardized in white, (the surface layer is made of special PU coating). Colors can be matched on the white basis. It can also be used for antique, gold, bronze and other special effects, and it is easy to wash.
⑥The surface pattern is clear and lifelike, with a strong three-dimensional effect.