Qhov sib txawv ntawm TPU polyether hom thiab polyester hom

Qhov txawv ntawmTPU polyether homthiabhom polyester

TPU muaj ob hom: hom polyether thiab hom polyester. Raws li qhov xav tau sib txawv ntawm cov khoom siv, yuav tsum xaiv ntau hom TPU. Piv txwv li, yog tias qhov xav tau rau kev tiv thaiv hydrolysis siab heev, hom polyether TPU zoo dua li hom polyester TPU.

Yog li hnub no, cia peb tham txog qhov sib txawv ntawmPolyether hom TPUthiabPolyester hom TPU, thiab yuav ua li cas thiaj paub qhov txawv ntawm 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 tau zoo, thiab cov txheej txheem txheeb xyuas.

1, Qhov sib txawv ntawm cov khoom siv raw

Kuv ntseeg tias ntau tus neeg paub txog lub tswv yim ntawm thermoplastic elastomers, uas muaj cov yam ntxwv ntawm kev muaj ob qho tib si mos thiab tawv, raws li, los coj kev ywj pheej thiab kev tawv rau cov khoom siv.

TPU kuj muaj ob qho tib si mos thiab tawv saw ntu, thiab qhov sib txawv ntawm polyether hom TPU thiab polyester hom TPU yog nyob rau hauv qhov sib txawv ntawm cov saw ntu mos. 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 qhov ntau npaum li 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 MDI suav txog li 40%, AA suav txog li 35%, thiab BDO suav 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 tsim polybutylene adipate ester ua cov saw ntu mos.

2, Qhov sib txawv ntawm cov qauv

Cov saw hlau molecular ntawm TPU muaj cov qauv kab (AB) n-hom thaiv, qhov twg A yog qhov hnyav molecular siab (1000-6000) polyester lossis polyether, B feem ntau yog butanediol, thiab cov qauv tshuaj lom neeg ntawm AB saw ntu yog diisocyanate.

Raws li cov qauv sib txawv ntawm A, TPU tuaj yeem muab faib ua hom polyester, hom polyether, hom polycaprolactone, hom polycarbonate, thiab lwm yam. Cov hom uas siv ntau dua 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 linear qauv, nrog rau qhov sib txawv tseem ceeb yog seb qhov saw hlau mos yog polyether polyol lossis polyester polyol.

3, Kev sib piv kev ua tau zoo

Polyether polyols yog cov cawv polymers lossis oligomers nrog ether bonds thiab hydroxyl pawg ntawm cov pab pawg kawg ntawm cov qauv molecular tseem ceeb. Vim nws lub zog sib koom ua ke qis ntawm ether bonds hauv nws cov qauv thiab yooj yim ntawm kev tig.

Yog li ntawd, polyether TPU muaj qhov yooj ywm zoo heev rau qhov kub thiab txias qis, tiv taus hydrolysis, tiv taus pwm, tiv taus UV, thiab lwm yam. Cov khoom muaj qhov zoo tes xis, tab sis lub zog tev tawv thiab lub zog tawg tsis zoo.

Cov pab pawg ester uas muaj zog sib txuas covalent hauv polyester polyols tuaj yeem tsim cov hydrogen bonds nrog cov saw hlau tawv, ua haujlwm ua cov ntsiab lus sib txuas elastic. Txawm li cas los xij, polyester feem ntau tawg vim yog kev nkag mus ntawm cov dej molecules, thiab cov kua qaub tsim los ntawm hydrolysis tuaj yeem ua rau cov hydrolysis ntawm polyester ntxiv.

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

4, Txoj kev txheeb xyuas

Txog qhov siv TPU zoo dua, tsuas yog hais tau tias kev xaiv yuav tsum ua raws li qhov xav tau ntawm cov khoom. Txhawm rau kom ua tiav cov khoom siv kho tshuab zoo, siv polyester TPU; Yog tias xav txog tus nqi, qhov ceev, thiab ib puag ncig siv khoom, xws li ua cov khoom siv dej lom zem, polyether TPU yog qhov tsim nyog dua.

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

Muaj ntau txoj kev, xws li kev ntsuas xim tshuaj, roj chromatography-mass spectrometry (GCMS), nruab nrab infrared spectroscopy, thiab lwm yam. Txawm li cas los xij, cov txheej txheem no xav tau cov kev cai siab thiab siv sijhawm ntev.

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

Txoj kev no tsuas yog xav tau ib lub tshuab ntsuas qhov ceev xwb. Piv txwv li, siv lub tshuab ntsuas roj hmab uas muaj qhov tseeb siab, cov kauj ruam ntsuas yog:

Muab cov khoom tso rau hauv lub rooj ntsuas, qhia qhov hnyav ntawm cov khoom, thiab nias lub pob Enter kom nco ntsoov.
Muab cov khoom tso rau hauv dej kom pom qhov ceev.
Tag nrho cov txheej txheem ntsuas siv sijhawm li 5 vib nas this, thiab tom qab ntawd nws tuaj yeem paub qhov txawv raws li lub hauv paus ntsiab lus tias qhov ceev ntawm polyester hom TPU siab dua li ntawm polyether hom TPU. Qhov ntau ntawm qhov ceev tshwj xeeb 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 sai sai.