The difference between the word, TPU and PU big difference!

TPU (Polyurethane Elastomer)

Polyurethane thermoplastic elastomer, also known as thermoplastic polyurethane rubber, abbreviated TPU, is an (AB) n-type block linear polymer, A is a high molecular weight (1000-6000) polyester or polyether, B is 2-12 straight The diol of the chain carbon atom, the chemical structure between AB segments is connected with diisocyanate, usually MDI.

TPU (Thermoplastic Polyurethane Elastomer) is a new plastic variety. Because TPU has good processability, weatherability and environmental protection, it is widely used in shoes, pipes, films, rollers, cables and wires and other related industries.

Thermoplastic polyurethane rubbers are cross-linked by intermolecular hydrogen bonds or lightly crosslinked between macromolecular chains. As the temperature increases or decreases, the two crosslinked structures are reversible. In the molten state or the solution state, the intermolecular force weakens, and after the cooling or the solvent volatilizes, strong intermolecular forces are connected together and the performance of the original solid is restored.

Polyurethane thermoplastic elastomers are polyester type and polyether type, white irregular spherical or columnar particles, relative density of 1.10-1.25, polyether type relative density than polyester type. The polyether glass transition temperature is 100.6-106.1 °C , and the polyester glass transition temperature is 108.9-122.8 °C . The brittle temperatures of polyether type and polyester type are lower than -62 °C , and the ether type is hardly inferior to polyester type.

The outstanding characteristics of polyurethane thermoplastic elastomers are excellent abrasion resistance, excellent ozone resistance, high hardness, high strength, good elasticity, low temperature resistance, good oil resistance, chemical resistance and environmental resistance, and polyethers in wet environments. The ester hydrolysis stability far exceeds the polyester type.

Polyurethane thermoplastic elastomer is non-toxic and odorless. It is soluble in solvents such as methyl ethyl ketone, cyclohexanone, tetrahydrofuran, dioxane, dimethylformamide, etc. It is also soluble in toluene, ethyl acetate, butanone, acetone, etc. The proportion of mixed solvents, showing a colorless and transparent state, have better storage stability.

PU (Polyurethane)

Polyurethane PU is a general term for a polymer compound formed by reacting a diisocyanate or a polyisocyanate with a compound having two or more hydroxyl groups, and contains many repeating NHCOO groups in its main chain. Commonly used diisocyanates are toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), dicyclohexylmethane diisocyanate (HMDI), polysilicon Methyl polyphenyl polyisocyanate (PAPI), xylylene diisocyanate (XDI), and the like.

According to the different hydroxyl components used, can be divided into two types of polyester and polyether. Can be used to manufacture plastic products, wear-resistant synthetic rubber products, synthetic fibers, rigid and flexible foam plastic products, adhesives and coatings.

TPU and PU are essentially the same material.

But when doing these two compounds. The formula they use is not the same. The two compounds are divided into a variety of properties. The properties of the compound that the different formulas make are not the same. These characteristics refer to mechanical and physical properties.

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