Aha ngwaahịa:polyurethane

Ọdịdị molekụla ngwaahịa:

Njirimara kemịkalụ:

Polyurethane (PU), aha zuru oke nke polyurethane, bụ ngwakọta polymer. 1937 site na Otto Bayer na mmepụta ihe ndị ọzọ nke ihe a. Enwere ụdị isi abụọ nke polyurethane, ụdị polyester na ụdị polyether. Enwere ike ịme ha ka ọ bụrụ plastik polyurethane (karịsịa ụfụfụ), eriri polyurethane (a na-akpọ spandex na China), roba polyurethane na elastomers.
Polyurethane na-agbanwe agbanwe bụ usoro nhazi nke nwere thermoplasticity, nke nwere nkwụsi ike ka mma, nkwụsi ike nke kemịkalụ, nkwụsi ike na ihe eji arụ ọrụ karịa ụfụfụ PVC, na-enwe obere mgbanwe mkpakọ. Ọ nwere ezigbo mkpuchi ọkụ, mkpuchi ụda, nguzogide ujo, yana ihe na-egbochi nsị. Ya mere, a na-eji ya dị ka nkwakọ ngwaahịa, ihe mkpuchi ụda na ihe nzacha. Plastic polyurethane siri ike bụ ìhè, mkpuchi ụda, mkpuchi ọkụ dị elu, nguzogide kemịkalụ, ezigbo ọkụ eletrik, nhazi dị mfe, na obere mmiri absorption. A na-ejikarị ya eme ihe maka ihe owuwu, ụgbọ ala, ụlọ ọrụ ụgbọ elu, mkpuchi okpomọkụ na mkpuchi ọkụ. Polyurethane elastomer arụmọrụ n'etiti rọba na roba, mmanụ na-eguzogide, eyi nguzogide, obere okpomọkụ na-eguzogide, ịka nká, ike siri ike, elasticity. A na-ejikarị ya eme ihe na ụlọ ọrụ akpụkpọ ụkwụ na ụlọ ọrụ ahụike. Enwere ike ịme polyurethane ka ọ bụrụ nrapado, mkpuchi, akpụkpọ anụ sịntetik, wdg.

Ngwa:

Polyurethane bụ otu n'ime ihe ndị kachasị mma n'ụwa taa. Ọtụtụ ojiji ha sitere na ụfụfụ na-agbanwe agbanwe na arịa ụlọ elu, na ụfụfụ siri ike dị ka ihe mkpuchi na mgbidi, ụlọ na ngwa ngwa na polyurethane thermoplastic eji na ngwaọrụ ahụike na akpụkpọ ụkwụ, na mkpuchi, nrapado, sealants na elastomers na-eji n'ala na ime ụlọ ụgbọala. A na-eji polyurethanes eme ihe n'ime afọ iri atọ gara aga na ngwa dị iche iche n'ihi nkasi obi ha, uru ọnụ ahịa, nchekwa ike na ike gburugburu ebe obibi. Kedu ihe ụfọdụ na-eme ka polyurethane dị mma? Ịdị ogologo nke polyurethane na-enye aka nke ukwuu na ogologo ndụ nke ọtụtụ ngwaahịa. Mgbakwunye nke usoro ndụ ngwaahịa na nchekwa ihe onwunwe bụ ihe dị mkpa gburugburu ebe obibi na-emekarị ka nhọrọ nke polyurethane [19-21]. Polyurethanes (PUs) na-anọchi anya klaasị dị mkpa nke thermoplastic na thermoset polymers dị ka akụrụngwa ha, thermal, na kemịkalụ nwere ike ahaziri site na mmeghachi omume nke polyols dị iche iche na poly-isocyanates.