Farqiga u dhexeeya nooca TPU polyether iyo nooca polyester

Farqiga u dhexeeyaNooca polyeter-ka ee TPUiyonooca polyester

TPU waxaa loo qaybin karaa laba nooc: nooca polyether iyo nooca polyester. Sida waafaqsan shuruudaha kala duwan ee codsiyada badeecadaha, noocyada kala duwan ee TPUs waa in la doortaa. Tusaale ahaan, haddii shuruudaha iska caabbinta hydrolysis ay yihiin kuwo aad u sarreeya, nooca polyether TPU ayaa ka habboon nooca polyester TPU.

Haddaba, maanta aan ka hadalno farqiga u dhexeeyaTPU nooca polyeter-kaiyoTPU nooca polyester-ka, iyo sidee loo kala saaraa? Kuwa soo socda ayaa faahfaahin doona afar dhinac: kala duwanaanshaha agabka ceeriin, kala duwanaanshaha qaab-dhismeedka, isbarbardhigga waxqabadka, iyo hababka aqoonsiga.

1, Kala duwanaanshaha alaabta ceeriin

Waxaan aaminsanahay in dad badan ay yaqaaniin fikradda elastomers-ka thermoplastic, kuwaas oo leh astaamo qaab-dhismeed oo ka kooban qaybaha jilicsan iyo kuwa adag, siday u kala horreeyaan, si ay u keenaan dabacsanaan iyo adkeysi walxaha.

TPU sidoo kale waxay leedahay qaybo silsilad jilicsan iyo kuwo adag labadaba, farqiga u dhexeeya nooca polyether-ka TPU iyo nooca polyester-ka TPU wuxuu ku jiraa farqiga qaybaha silsiladda jilicsan. Waxaan arki karnaa farqiga u dhexeeya walxaha ceeriin.

Nooca Polyether-ka ee TPU: 4-4 '- diphenylmethane diisocyanate (MDI), polytetrahydrofuran (PTMEG), 1,4-butanediol (BDO), oo leh qiyaas qiyaastii 40% MDI, 40% PTMEG, iyo 20% BDO.

Nooca Polyester-ka TPU: 4-4 '- diphenylmethane diisocyanate (MDI), 1,4-butanediol (BDO), adipic acid (AA), iyadoo MDI ay tahay qiyaastii 40%, AA waxay tahay qiyaastii 35%, iyo BDO waxay tahay qiyaastii 25%.

Waxaan arki karnaa in walxaha ceeriin ee qaybta silsiladda jilicsan ee TPU nooca polyether ay tahay polytetrahydrofuran (PTMEG); Qalabka ceeriin ee noocyada polyester ee qaybaha silsiladda jilicsan ee TPU waa adipic acid (AA), halkaas oo adipic acid uu la falgalo butanediol si uu u sameeyo polybutylene adipate ester oo ah qaybta silsiladda jilicsan.

2, Kala duwanaanshaha qaab-dhismeedka

Silsiladda molecular-ka ee TPU waxay leedahay qaab-dhismeed toosan oo nooca n-nooca ah (AB), halkaas oo A uu yahay polyester ama polyether miisaankiisu sarreeyo (1000-6000), B guud ahaan waa butanediol, qaab-dhismeedka kiimikada ee u dhexeeya qaybaha silsiladda AB waa diisocyanate.

Sida ku cad qaab-dhismeedka kala duwan ee A, TPU waxaa loo qaybin karaa nooca polyester, nooca polyether, nooca polycaprolactone, nooca polycarbonate, iwm. Noocyada ugu caansan waa nooca polyether TPU iyo nooca polyester TPU.

Jaantuska kor ku xusan, waxaan ku arki karnaa in silsiladaha molecular-ka guud ee nooca polyether-ka ee TPU iyo nooca polyester-ka ee TPU labaduba ay yihiin qaab-dhismeedyo toosan, iyadoo farqiga ugu weyn uu yahay in qaybta silsiladda jilicsan ay tahay polyol polyether ah ama polyol polyester ah.

3, Isbarbardhigga Waxqabadka

Polyol-yada Polyether waa polymers-ka khamriga ama oligomers-ka leh xidhmooyinka ether iyo kooxaha hydroxyl ee kooxaha ugu dambeeya ee qaab-dhismeedka silsiladda ugu weyn ee molecular-ka. Sababtoo ah tamar isku-dhafan oo hooseeya oo ka mid ah xidhmooyinka ether ee qaab-dhismeedkeeda iyo fududaynta wareegga.

Sidaa darteed, TPU-ga polyether-ka ah wuxuu leeyahay dabacsanaan heer-kulka hooseeya oo aad u fiican, iska caabinta hydrolysis, iska caabinta caaryada, iska caabinta UV, iwm. Badeecadu waxay leedahay dareen gacan oo wanaagsan, laakiin xoogga diirka iyo xoogga jabka ayaa ah kuwo liita.

Kooxaha ester-ka ee leh tamar isku xidhka covalent ee xooggan ee polyols-ka polyester-ka waxay samayn karaan xidhmo haydarojiin ah oo leh qaybo silsilad adag ah, iyagoo u adeegaya sidii dhibco isku xidhka laastikada ah. Si kastaba ha ahaatee, polyester-ku wuxuu u nugul yahay inuu jabo sababtoo ah duullaanka molecules-ka biyaha, aashitada ka dhalata hydrolysis-kuna waxay sii kicin kartaa hydrolysis-ka polyester-ka.

Sidaa darteed, polyester TPU wuxuu leeyahay sifooyin farsamo oo aad u fiican, iska caabin xirasho, iska caabin jeexjeex, iska caabin kiimiko ah, iska caabin heerkul sare, iyo habayn fudud, laakiin iska caabin hydrolysis liidata.

4, Habka Aqoonsiga

Marka laga hadlayo TPU-ga ugu fiican in la isticmaalo, waxaa la dhihi karaa oo keliya in xulashada ay ku saleysan tahay shuruudaha jireed ee badeecada. Si aad u gaarto sifooyin farsamo oo wanaagsan, isticmaal TPU-ga polyester-ka; Haddii aad tixgelinayso kharashka, cufnaanta, iyo deegaanka isticmaalka badeecada, sida sameynta alaabada madadaalada biyaha, TPU-ga polyether-ka ayaa ku habboon.

Si kastaba ha ahaatee, marka la dooranayo, ama si kama' ah loogu qasayo laba nooc oo TPU ah, ma laha farqi weyn oo muuqaal ah. Haddaba sideen u kala saari karnaa?

Waxaa jira habab badan oo dhab ahaantii jira, sida colorimetry-ka kiimikada, gaaska chromatography-mass spectrometry (GCMS), mid infrared spectroscopy, iwm. Si kastaba ha ahaatee, hababkani waxay u baahan yihiin shuruudo farsamo oo sare waxayna qaataan waqti dheer.

Ma jiraa hab aqoonsi oo fudud oo dhakhso badan? Jawaabtu waa haa, tusaale ahaan, habka isbarbardhigga cufnaanta.

Habkani wuxuu u baahan yahay hal tijaabiye cufnaan oo keliya. Marka la eego mitirka cufnaanta cinjirka ee saxsan tusaale ahaan, tallaabooyinka cabbiraadda waa:

Ku rid badeecada miiska cabbirka, soo bandhig miisaanka badeecada, oo riix furaha Enter si aad u xasuusato.
Badeecada ku rid biyo si aad u muujiso qiimaha cufnaanta.
Habka cabbiraadda oo dhan wuxuu qaataa qiyaastii 5 ilbiriqsi, ka dibna waxaa lagu kala saari karaa iyadoo lagu saleynayo mabda'a ah in cufnaanta nooca polyester-ka ee TPU uu ka sarreeyo kan nooca polyether-ka ee TPU. Kala duwanaanshaha cufnaanta gaarka ah waa: nooca polyether-ka ee TPU -1.13-1.18 g/cm3; Polyester TPU -1.18-1.22 g/cm3. Habkani si dhakhso ah ayuu u kala saari karaa nooca polyester-ka ee TPU iyo nooca polyether-ka.