Qhov txawv ntawm TPU polyether hom thiab polyester hom

Qhov txawv ntawmTPU polyether homthiabpolyester yam

TPU tuaj yeem muab faib ua ob hom: polyether hom thiab polyester hom. Raws li cov kev cai sib txawv ntawm cov khoom siv, ntau hom TPUs yuav tsum tau xaiv. Piv txwv li, yog tias qhov yuav tsum tau ua rau hydrolysis tsis kam yog qhov siab, polyether hom TPU yog qhov tsim nyog tshaj li polyester hom TPU.

Yog li hnub no, cia peb tham txog qhov sib txawv ntawmPolyether hom TPUthiabpolyester hom TPU, thiab yuav ua li cas paub qhov txawv lawv? Cov hauv qab no yuav piav qhia txog plaub yam: qhov sib txawv ntawm cov khoom siv raw, qhov sib txawv ntawm cov qauv, kev sib piv kev ua haujlwm, thiab kev txheeb xyuas cov txheej txheem.

1 、 Qhov sib txawv ntawm cov khoom siv raw

Kuv ntseeg tias ntau tus neeg paub lub tswv yim ntawm cov thermoplastic elastomers, uas muaj cov yam ntxwv ntawm cov khoom muag thiab cov tawv tawv, feem, kom coj tau yooj yim thiab rigidity rau cov khoom.

TPU kuj muaj ob qho tib si mos thiab tawv saw ntu, thiab qhov sib txawv ntawm polyether hom TPU thiab polyester hom TPU nyob rau hauv qhov sib txawv ntawm cov saw muag. Peb tuaj yeem pom qhov sib txawv ntawm cov khoom siv raw.

Polyether hom TPU: 4-4 '- diphenylmethane diisocyanate (MDI), polytetrahydrofuran (PTMEG), 1,4-butanediol (BDO), nrog rau ntau npaum li cas ntawm 40% rau MDI, 40% rau PTMEG, thiab 20% rau BDO.

Polyester hom TPU: 4-4 '- diphenylmethane diisocyanate (MDI), 1,4-butanediol (BDO), adipic acid (AA), nrog rau MDI accounting txog li 40%, AA accounting txog li 35%, thiab BDO accounting txog li. 25%.

Peb tuaj yeem pom tias cov khoom siv raw rau polyether hom TPU mos saw ntu yog polytetrahydrofuran (PTMEG); Cov khoom siv raw rau polyester hom TPU mos saw ntu yog adipic acid (AA), qhov twg adipic acid reacts nrog butanediol los ua polybutylene adipate ester raws li cov saw muag.

2, Cov qauv sib txawv

Cov saw hlau molecular ntawm TPU muaj ib qho (AB) n-type block linear qauv, qhov twg A yog qhov hnyav molecular (1000-6000) polyester lossis polyether, B feem ntau yog butanediol, thiab cov qauv tshuaj ntawm AB saw ntu yog diisocyanate.

Raws li cov qauv sib txawv ntawm A, TPU tuaj yeem muab faib ua hom polyester, hom polyether, polycaprolactone hom, polycarbonate hom, thiab lwm yam. Cov ntau hom yog polyether hom TPU thiab polyester hom TPU.

Los ntawm daim duab saum toj no, peb tuaj yeem pom tias tag nrho cov saw hlau molecular ntawm polyether hom TPU thiab polyester hom TPU yog ob qho tib si cov qauv, nrog rau qhov sib txawv tseem ceeb yog seb cov saw muag muag yog polyether polyol lossis polyester polyol.

3 、 Kev sib piv kev ua haujlwm

Polyether polyols yog cawv polymers los yog oligomers nrog ether bonds thiab hydroxyl pawg nyob rau hauv cov pab pawg neeg kawg ntawm cov molecular ntsiab saw qauv. Vim nws tsis tshua muaj zog cohesive ntawm ether bonds nyob rau hauv nws cov qauv thiab yooj yim ntawm kev sib hloov.

Yog li ntawd, polyether TPU muaj qhov zoo ntawm qhov kub thiab txias yooj yim, hydrolysis tsis kam, pwm tsis kam, UV tsis kam, thiab lwm yam. Cov khoom muaj kev xav zoo, tab sis lub zog tev thiab tawg lub zog kuj tsis zoo.

Cov ester pawg uas muaj zog covalent bonding zog nyob rau hauv polyester polyols muaj peev xwm tsim hydrogen daim ntawv cog lus nrog nyuaj saw ntu, ua hauj lwm raws li elastic crosslinking cov ntsiab lus. Txawm li cas los xij, polyester tuaj yeem tawg vim qhov cuam tshuam ntawm cov dej molecules, thiab cov kua qaub uas tsim los ntawm hydrolysis tuaj yeem ua rau cov hydrolysis ntawm polyester ntxiv.

Yog li ntawd, polyester TPU muaj cov cuab yeej zoo heev, hnav tsis kam, tsim kua muag, tshuaj lom neeg corrosion, kub tsis kam, thiab ua haujlwm yooj yim, tab sis tsis zoo hydrolysis tsis kam.

4 、 Kev txheeb xyuas tus kheej

Raws li qhov twg TPU yog qhov zoo dua los siv, nws tsuas tuaj yeem hais tias kev xaiv yuav tsum yog raws li lub cev xav tau ntawm cov khoom. Yuav kom ua tiav cov khoom siv kho tshuab zoo, siv polyester TPU; Yog tias xav txog tus nqi, qhov ntom ntom, thiab cov khoom siv ib puag ncig, xws li ua cov khoom siv dej lom zem, polyether TPU yog qhov tsim nyog dua.

Txawm li cas los xij, thaum xaiv, lossis sib xyaw ua ke ntawm ob hom TPUs, lawv tsis muaj qhov sib txawv tseem ceeb hauv qhov tsos. Yog li cas peb yuav tsum paub qhov txawv ntawm lawv?

Muaj ntau txoj hauv kev, xws li tshuaj lom neeg colorimetry, roj chromatography-mass spectrometry (GCMS), nruab nrab infrared spectroscopy, thiab lwm yam. Txawm li cas los xij, cov txheej txheem no yuav tsum tau ua haujlwm siab thiab siv sijhawm ntev.

Puas muaj ib txoj hauv kev yooj yim thiab ceev ceev? Cov lus teb yog yog, piv txwv li, txoj kev sib piv ceev.

Txoj kev no tsuas yog xav tau ib tus neeg ntsuas qhov ntom ntom. Ua ib qho piv txwv ntawm cov roj hmab high-precision rubber density meter, cov kauj ruam ntsuas yog:

Muab cov khoom tso rau hauv lub rooj ntsuas, tso saib qhov hnyav ntawm cov khoom, thiab nias tus yuam sij Enter kom nco qab.
Muab cov khoom tso rau hauv dej kom pom tus nqi ntom ntom.
Tag nrho cov txheej txheem ntsuas yuav siv li 5 vib nas this, thiab tom qab ntawd nws tuaj yeem ua qhov txawv raws li lub hauv paus ntsiab lus tias qhov ntom ntawm polyester hom TPU siab dua li ntawm polyether hom TPU. Qhov tshwj xeeb qhov ceev yog: polyether hom TPU -1.13-1.18 g / cm3; Polyester TPU -1.18-1.22 g / cm3. Txoj kev no tuaj yeem paub qhov txawv ntawm TPU polyester hom thiab polyether hom.