Intshayelelo:
I-Polyurethane (PU) apha: I-PU sisixhobo esibaluleke kakhulu esiyibona yonke indawo kwiimveliso zethu zemihla ngemihla. Igubungela ngenxa yokuba yomelele, ibhetyebhetye, kwaye kulula ukusebenza nayo. Unokufumana i-PU kwizinto ezinjengemiqamelo yogwebu, ezenza kube lula ngathi ukuhlala kwaye singqengqe, ipeyinti, ekhusela umphezulu, iglue, egcina izinto kunye, i-hairspray, egcina iinwele zethu zimile, kunye ne-caulking, esigcina ekuvuzeni. IiCatalysts yinto esiyidingayo ukwenza i-polyurethanes esebenza kakuhle. Zizinto ezisebenzayo ezonyusa iimveliso zePU ngokwamandla, ukuguquguquka, kunye nokuqina. Ngoku, makhe sijonge ngakumbi kwii-catalysts ezilungileyo kunye neendima zabo ekuphuhliseni i-polyurethanes ehlala ixesha elide kwaye eyomeleleyo.
Ukubaluleka kweeCatalysts kwiiPolyurethanes eziqinileyo
I-Polyurethane synthesis iququzelelwa kakhulu zii-catalysts, njengoko zikhawulezisa ukusabela kweekhemikhali ngemiyalelo emininzi yobukhulu. Ngaphandle kwee-catalysts, inkqubo ye-polyurethanes inokuthatha ixesha elide, kwaye isiphumo sinokungasebenzi kakuhle njengoko sifuna. IiCatalysts zikhuthaza i-polymerization yeendlela zolwelo i-organotin compound izinto eziphathekayo zibe zeziqinileyo. Eli linyathelo elibalulekileyo njengoko livumela ukuba izithako zidibanise kwaye zidibanise kunye. Oku kwenza ukusabela ngokukhawuleza, kunye nobungakanani bobushushu ukwenza i-polyurethane ibe ngaphantsi kakhulu, kwaye ivumela imveliso yokugqibela ukuba yomelele kakhulu.
Eyona PU Catalysts yePolyurethane ephuculweyo:
I-Lingshi ekhethekileyo ye-PU catalysts esetyenziselwa ukunyusa iimpawu ze-polyurethanes. Ezi itetrabutyl Isinyithi sincedisa ukuzinza kwe-polyurethanes, ukukhawulezisa ukusabela, kunye nokuququzelela unyango olukhawulezayo. I-Tin-based Catalyst yeyokuqala i-Lingshi catalyst. Le catalyst iyaziwa ngokusebenza kwayo okuphezulu ekudambiseni ukusabela kwe-isocyanate nge-polyol. Iqhele ukusetyenziselwa ukwenza iipolyurethanes eziguquguqukayo neziqinileyo ezisetyenziswa kwizinto ezinje ngecushion, iipeyinti, izinto zokuncamathelisa kunye nezitywina. Oku kubangela amandla aphezulu kunye nokuguquguquka kweemveliso zokugqibela, okwenza kube yinto efanelekileyo kwimpahla ephezulu.
I-catalyst yesibini yaziwa ngokuba yi-Bismuth-based Catalyst. Yinto ehamba phambili edge catalyst kwaye ingasetyenziselwa ukuvelisa zombini i-polyurethanes eqinile kwaye eguquguqukayo. Ifumaneka kwiimveliso ezifana neepeyinti kunye neeglues-ngakumbi ezo zisetyenziselwa ukwakha izihluzi zomoya. Yenye yeepropathi ezintle ngenene malunga ne-Bismuth-based Catalyst, kukuba inexesha elikhawulezayo lokunyanga kwaye inokusebenza kumaqondo obushushu asezantsi, nto leyo eyinzuzo ngokwenene kwiinkqubo zamashishini.
Indlela entsha yokwenza iPolyurethanes yomelele kwaye ihlale ixesha elide
Ke njengeempawu ezahlukeneyo zeepolymers, ezona zixhobo zibalaseleyo zePU ezifana neLingshi Tin-based kunye neBismuth-based Catalysts ziluncedo kakhulu ekuveliseni i-polyurethane ukuba yomelele kwaye yomelele. Ukudibanisa ezi zixhobo zivumela amashishini ukuba aqulunqe iipolyurethanes ezihlala zihlala zihlala zihlala zihlala zihlala zihlala zihlala zihlala zihlala zihlala zikhona. Basebenza njenge-catalysts kwaye baphucula iimpawu zemishini yeemveliso. Oku kuguqulela ekugqibeleni iimveliso ze-polyurethane ziphuculwe ekuxhathiseni ukuguga kunye nokukrazula, ukuguquguquka, kunye nokubambelela okuphezulu kunye nezinye iindawo. Oku kuguquguquka kwenza ukusetyenziswa kwe-polyurethane i-organotine iimveliso zokwenza yonke into ukusuka kwifanitshala ukuya kwizinto zokwakha.
Isishwankathelo:
Ukuqukumbela, iicatalysts eziphezulu zePU ezivela eLingshi zibalulekile ekuveliseni iipolyurethanes ezigqwesileyo. IiCatalysts zisekwe kwiTin okanye kwiBismuth kwaye zinceda ekwenzeni ukusabela kwenzeke ngokukhawuleza phakathi kwe-isocyanate kunye ne-polyol. Zihlala zihlala, ziguquguquka, kwaye zizinzile ngokwaneleyo kwinani le-polyurethanes. Ukusebenzisa ezi zixhobo zivumela abavelisi ukuba baphucule kakhulu iimpawu zomatshini we-polyurethanes, ukunika ukuguquguquka okuphuculweyo, ukunamathela, kunye nokuqina, okubaluleke kakhulu ukubonelela ngeemveliso ezithembekileyo kwimarike.
