Farqiga u dhexeeya nooca polyeter-ka TPU iyo nooca polyester-ka

Farqiga u dhexeeyaNooca polyeter-ka TPUiyonooca polyester-ka

TPU waxaa loo qaybin karaa laba nooc: nooca polyetherka iyo nooca polyesterka. Marka loo eego shuruudaha kala duwan ee codsiyada alaabta, noocyada kala duwan ee TPU-yada ayaa loo baahan yahay in la doorto. Tusaale ahaan, haddii shuruudaha iska caabbinta hydrolysis ay aad u sarreeyaan, nooca polyether-ka TPU ayaa ka habboon nooca polyester-ka TPU.

Haddaba maanta aan ka hadalno faraqa u dhexeeyanooca polyeter-ka TPUiyopolyester nooca TPU, iyo sida loo kala saaro? Kuwa soo socdaa waxay faahfaahin doonaan afar dhinac: kala duwanaanshaha alaabta ceeriin, kala duwanaanshaha qaabdhismeedka, isbarbardhigga waxqabadka, iyo hababka aqoonsiga.

1. Kala duwanaanshaha alaabta ceeriin

Waxaan rumaysanahay in dad badani ogyihiin fikradda elastomers-ka thermoplastic, kuwaas oo leh qaab dhismeed oo ka kooban qaybo jilicsan iyo kuwo adag, siday u kala horreeyaan, si ay u keenaan dabacsanaan iyo qallafsanaan walxaha.

TPU waxay sidoo kale leedahay qaybo silsilado jilicsan iyo adag labadaba, iyo farqiga u dhexeeya nooca polyether TPU iyo nooca polyester TPU waxay ku jirtaa farqiga u dhexeeya qaybaha silsiladaha jilicsan. Waxaan arki karnaa farqiga u ah alaabta ceeriin.

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

Nooca Polyester-ka TPU: 4-4 '- diphenylmethane diisocyanate (MDI), 1,4-butanediol (BDO), adipic acid (AA), oo leh MDI xisaabinta qiyaastii 40%, AA xisaabinta qiyaastii 35%, iyo xisaabinta BDO 25%.

Waxaan arki karnaa in alaabta ceeriin ee nooca polyether-ka ah ee TPU qaybta silsiladda jilicsan ay tahay polytetrahydrofuran (PTMEG); Qalabka ceeriin ee nooca polyester-ka ee TPU qaybaha silsiladaha jilicsan waa adipic acid (AA), halkaas oo adipic acid ay la falgasho butanediol si ay u sameyso polybutylene adipate ester sida qaybta silsiladda jilicsan.

2. Kala duwanaanshaha qaabdhismeedka

Silsiladda molecular ee TPU waxay leedahay qaab-dhismeed toosan oo ah (AB) nooca n-nooca ah, halkaas oo A uu yahay miisaan sare oo kelli ah (1000-6000) polyester ama polyeter, B guud ahaan waa butanediol, iyo qaabdhismeedka kiimikada ee u dhexeeya qaybaha silsiladda AB waa diisocyanate.

Marka loo eego qaababka kala duwan ee A, TPU waxaa loo qaybin karaa nooca polyester-ka, nooca polyether-ka, nooca polycaprolactone, nooca polycarbonate, iwm.

Laga soo bilaabo shaxanka kor ku xusan, waxaan arki karnaa in guud ahaan silsiladaha molecular ee nooca polyether-ka ah ee TPU iyo nooca polyester-ka ee TPU ay yihiin labadaba qaab-dhismeed toos ah, iyada oo farqiga ugu weyni uu yahay in qaybta silsiladda jilicsan ay tahay polyeter polyeter ama polyester polyol.

3. Isbarbardhigga waxqabadka

Polyether polyols waa alkolada polymers ama oligomers oo leh curaarta ether iyo kooxaha hydroxyl ee kooxaha ugu dambeeya ee qaabka silsiladda molecular ee ugu weyn. Sababtoo ah tamarta isku xiran ee hooseeya ee ether bonds ee qaabkeeda iyo sahlanaanta wareegga.

Sidaa darteed, polyether TPU waxay leedahay dabacsanaan heerkul hooseeya oo heer sare ah, iska caabbinta hydrolysis, caabbinta caaryada, caabbinta UV, iwm. Badeecadu waxay leedahay dareen gacan oo wanaagsan, laakiin xoogga diirka iyo xoogga jabku waa mid liita.

Kooxaha ester-ka ee leh tamarta isku-xidhka xooggan ee polyester polyols waxay samayn karaan bonds hydrogen oo leh qaybo silsilad adag, oo u adeegaya sidii dhibco isku xidhid laastikada ah. Si kastaba ha ahaatee, polyesterku waxay u nugul yihiin inay jabaan sababtoo ah duulaanka unugyada biyaha, iyo asiidhka ay dhaliso hydrolysis waxay sii kicin kartaa hydrolysis ee polyesterka.

Sidaa darteed, polyester TPU waxay leedahay sifooyin farsamo oo aad u fiican, xirto iska caabin, iska caabin jeexjeexa, caabbinta kiimikada, iska caabinta heerkulka sare, iyo habaynta fudud, laakiin iska caabin hydrolysis liidata.

4. Habka aqoonsiga

Sida TPU ay u fiican tahay in la isticmaalo, waxaa kaliya oo la sheegi karaa in xulashada ay ku saleysan tahay shuruudaha jireed ee alaabta. Si loo gaaro sifooyinka farsamada wanaagsan, isticmaal polyester TPU; Haddii la tixgeliyo qiimaha, cufnaanta, iyo deegaanka isticmaalka alaabta, sida samaynta alaabta madadaalada biyaha, polyether TPU ayaa ku habboon.

Si kastaba ha noqotee, marka aad dooranayso, ama si lama filaan ah isku dhafan laba nooc oo TPUs ah, ma laha farqi weyn oo muuqaal ah. Haddaba sidee baan u kala saarnaa?

Dhab ahaantii waxaa jira habab badan, sida kiimikaad midabaynta, gaaska chromatography-mass spectrometry (GCMS), spectroscopy infrared dhexe, iwm. Si kastaba ha ahaatee, hababkani waxay u baahan yihiin shuruudo farsamo oo sarreeya waxayna qaataan waqti dheer.

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

Habkani wuxuu u baahan yahay hal tijaabiye cufnaanta kaliya. Qaadashada mitir cufnaanta caagga ah ee saxda ah tusaale ahaan, tillaabooyinka cabbirku waa:

Geli alaabta miiska cabbirka, muuji miisaanka alaabta, oo taabo furaha Gelida si aad u xasuusato.
Geli alaabta biyaha si aad u muujiso qiimaha cufnaanta.
Nidaamka cabbirka oo dhan wuxuu qaadanayaa ilaa 5 ilbiriqsi, ka dibna waa la kala saari karaa iyadoo lagu saleynayo mabda'a ah in cufnaanta nooca polyester-ka TPU uu ka sarreeyo kan nooca polyeter-ka TPU. Cufnaanta gaarka ah waa: nooca polyeter TPU -1.13-1.18 g / cm3; Polyester TPU -1.18-1.22 g/cm3. Habkani wuxuu si dhakhso ah u kala saari karaa nooca TPU polyester-ka iyo nooca polyeter-ka.