Hais txog qhov sib txawv Scanning Calorimeter (DSC) ntsuas oxidation induction sijhawm (ib feem 2)

OIT (oxidation induction sijhawm) daim ntawv thov:

Txawm tias oxidation induction lub sijhawm yog ib txoj kev sim rau cov kev lag luam uas plastics, nws yuav siv tau rau hauv kev lag luam CCL rau kev soj ntsuam ntawm cov tshav kub-resistant oxygen kev laus ntawm CCL, muab lub hauv paus rau kev soj ntsuam me me thiab qhia kev tshawb nrhiav thiab kev txhim kho.

2 Cov khoom siv Polyolefin feem ntau siv rau kev tiv thaiv thiab kev tiv thaiv ntawm cov twj cab hluav taws xob thiab cables, thiab thermal oxidative stability ntawm polyolefins siv rau ntawm qhov muag cables thiab cables yuav siv los txiav txim rau lawv lub neej, thiab theem ntawm cov khoom ruaj ntseg tuaj yeem soj ntsuam los ntawm oxidation pib lub sijhawm.

Qhov kev xeem no tau piav qhia hauv cov hauv qab no:

1 ntsuas ntsuas:

DSC-500 Sib Paug Calorimeter

2 Raws li tus txheej txheem:

ISO 11357-6: 2008

Plastics - Diary scorching calorimetry (DSC) - Tshooj 6: Kev txiav txim siab ntawm oxidation induction sijhawm (isothermal OIT) thiab oxidation induction temperature (dynamic OIT)

3 hauv paus ntsiab lus:

Oxidation induction sijhawm (isothermal OIT):

Cov qauv thiab cov ntaub ntawv raug sov tawm ntawm ib qho chaw nyob rau hauv qhov chaw huab cua. Thaum twg qhov kev teev lus ntsuas kub, hloov mus rau tib qhov khiav ceev ntawm cov pa lossis cua. Cov qauv no tau tshwm sim ntawm qhov kev ntsuas kub no kom txog rau thaum muaj qhov tshuaj tiv thaiv oxidation tau qhia nyob rau lub ntsuas cua thermal. Isothermal OIT yog lub sij hawm luv ntawm pib ntawm oxygen lossis cua rau oxidation. Lub sijhawm pib ntawm oxidation yog qhia los ntawm kev cia siab exotherm ntawm tus qauv. Nws yog embodied hauv DSC curve.

Oxidation vim raug kub (dynamic OIT):

Cov qauv thiab cov ntaub ntawv raug sov tawm ntawm tus nqi nyob hauv cov pa lossis cov cua kom txog thaum oxidation cov tshuaj tiv thaiv tau tshwm sim nyob rau lub ntsuas cua thermal. Dynamic OIT yog qhov kub ntawm qhov tshuaj tiv thaiv oxidation pib. Qhov pib taw tes ntawm oxidation yog qhia los ntawm cia li nce hauv exotherm ntawm tus qauv, uas tuaj yeem pom cai los ntawm DSC qhov nkhaus.

4 Crucibles:

Muab cov hnoos qeev tso rau hauv qhov qhib los yog hauv ib qho chaw kaw, tab sis lub qhov cub ua cua. Nws yog qhov zoo tshaj plaws los siv txhuas crucibles.

5 Cov pa roj tsawg npaum li cas:

Tus nqi roj yog feem ntau 50 ± 5 ml / min. Cov nram no yog ib qho piv txwv ntawm isothermal OIT:

6 Siv cov tshuaj looj looj tsom iav Isothermal ua ib qho piv txwv los ntsuas tus txheej txheem tseem ceeb:

1 .Tem roj gas rau 5 feeb ua ntej pib sov tuaj

2 .20 ° C / min cov cua sov, qhov kub thiab txias yog xaiv li 10 zaus ntawm qhov ntsuas kub

3. Thaum tus OIT tsawg dua 10min thiab ntau dua 60 feeb, nws yuav tsum tau rov qab kuaj dua qis dua thiab siab dua.

4 .Txhua kub npaum li cas 3 feeb thaum ntsuas kub

5. Tom qab qhov kawg ntawm qhov ntsuas kub tas, hloov cov pa mus rau qhov qub txaus, thiab mus tas li qhov kub kom txog thaum tsawg kawg yog 2 feeb tom qab qhov kev hloov pauv ntawm exotherm tshwm sim.

6. Kawg ua tiav

7. Piv txwv kev ua qauv:

Lus Cim: 1 Kev ntsuas ntawm lub isothermal OIT taw tes yog qhov kev sib tshuam ntawm tus ntxhiab nkhaus ua ntej cov pa thiab qhov yoov nkhaus tom qab oxidation ntawm cov qauv (tangential tsom)

2 Qhov siab dua ntawm qhov ntsuas ntawm qhov hnyuv, lub sij hawm luv dua qhov oxidation induction; ceev cov cua sov, qhov siab dua qhov kub thiab txias thaum lub sij hawm oxidation induction. Lub sij hawm oxidation induction thiab qhov oxidation induction ntsuas kub kuj muaj feem xyuam rau cov cheeb tsam ntawm cov qauv raug oxidation.

Nws paub los ntawm cov lus hais saum toj no hais tias qhov DSC curve extends downward ntawm 11.6 min tom qab oxygenation, uas yog ib qho kev pom zoo ntawm exothermic, uas yog, qhov tshuaj tiv thaiv oxidation ntawm tus qauv tshwm sim, uas yog, oxidation induction lub sij hawm ntawm cov qauv yog 11.6 min.

Zoo Siab Txais Tos los xaiv peb Cov Piv Txwv Sib Thooj Zog:

https://www.chinatestequipments.com/tests-on-plastic-raw-materials/differential-scanning-calorimeter/computer-controlled-digital-screen.html