Stress Relief Toy, Pu Foam Stress Ball, Brain Stress Reliever material is PU foam and this is the details introduction of PU foam:
PU foam board is the latest international roofing sheet. It is not only beautiful in appearance, light in weight, easy to install, but also has high heat insulation, sound insulation, fireproof and long service life compared with similar products. advantage. The installation adopts direct lap joint, convenient construction, relatively low cost, and can better prevent the phenomenon of roof degumming and leakage. It is the most ideal roofing material for steel structure workshops, industrial and mining, and civil buildings. It mainly includes: polyurethane foam board, aluminum magnesium manganese Pu foam board, PU foam board EPS sandwich board, low density PU foam board, etc. PU is the abbreviation of Polyurethane. The Chinese name is polyurethane. Polyurethane is a chemical substance. It is characterized by simple modification of the formula to obtain different physical properties such as density, elasticity and rigidity. Insulation materials, wood, traditional rubber products, etc.
PU foam Superior performance
1. The tensile strength is 265MPa, which is 2.5 times of the strength of ordinary aluminum plate. It is a good choice for home building materials;
2, corrosion resistance is 3 times that of ordinary aluminum plate, 2 times that of stainless steel;
3, reduce noise, shock absorption, can withstand large impact loads;
4, superior electromagnetic wave shielding performance makes the human brain not hurt;
5, reduce costs, reduce materials, extend the service life 3 times
Overview of features
PU foam board is a plastic made of polyurethane chemicals. In fact, pu foam board is a plastic board. The chemical substance is only polyurethane. To make polyurethane, two kinds of substances with at least two functions are required as reactants: contains isocyanate functional groups. a compound, and a compound containing an active hydrogen atom. The physicochemical properties, structure and molecular size of these compounds are subject to polymerization, ease of processing and isocyanate, while the main process for the production of isocyanates is the reaction of amines with phosgene. The starting material amine is formed by the hydrogenation of the corresponding nitrate, such as toluenediamine (TDA) which is formed from dinitrotoluene and then converted to toluene diisocyanate (TDI). Diaminodiphenylmethane or phenylmethane is derived from nitrate The benzene is formed into 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 species being TDI-80 (TD-80), containing 80% of the 2,4-isomer and 20% of the 2,6-isomer This mixture is used in large quantities to make polyurethane flexible slabstock foams and molded foams. TDI, especially the crude TDI and TDI/MDI blends can be used in rigid foam products, but slowly polymerized MDI. Instead, TDI-polyether and TDI-polyester prepolymers are used in high performance coatings and elastomers. Prepolymers require the use of vacuum to remove TDI monomers. There are three types of diphenylmethane diisocyanate (MDI). Isomers, 4,4'-MDI, 2,4'-MDI, and 2,2'-MDI, can also be achieved by polymerization or even enhanced The physical properties of the functional isomers of the three isomers are affected.
At present, China's TDI is also known as toluene diisocyanate, such as highly toxic substances. If you want to know TDI then you can search online, (TDI), tdi is an organic compound with strong pungent odor, on the skin, Eyes and respiratory tract have strong stimulating effects. Long-term exposure or inhalation of high concentrations of TDI can cause physical effects such as bronchitis, allergic asthma, pneumonia, and pulmonary edema.