PAPI (Polymeric MDI) hauv Polyurethane Formulations: Cov Cwj Pwm thiab Cov Ntsiab Lus Xaiv

PAPI (Polymeric MDI) hauv Polyurethane Formulations: Cov Cwj Pwm thiab Cov Ntsiab Lus Xaiv

Yog tias koj tsim polyurethane formulations, koj yuav thaum kawg ntsib kev xaiv: ntshiab MDI lossisPolymeric MDI (PAPI). Lo lus nug tsis yog qhov twg yog qhov zoo dua, tab sis qhov twg haum rau koj cov txheej txheem thiab kev ua tiav kawg. Kab lus no saibCAS Nr .: 9016-87-9los ntawm tus tsim qauv qhov kev xav thiab hais txog cov ntsiab lus txiav txim siab uas tseem ceeb hauv kev xyaum.

Dab tsi PAPI Tiag Tiag

Polymethylene polyphenyl polyisocyanate (CAS 9016-87-9)feem ntau hu uaPolymeric MDI (PMDI)los yogPAPI. Nws tsis yog ib qho sib xyaw ua ke tab sis sib xyaw ntawm MDI isomers thiab siab dua -functionality oligomers. Cov qib kev lag luam feem ntau muaj li 50% MDI monomer, nrog rau qhov seem yog tri- nplhaib thiab siab dua oligomers. Qhov no muab qhov nruab nrab ua haujlwm nruab nrab ntawm 2.6 thiab 3.0.

Qhov kev ua haujlwm saum toj no 2 yog qhov txawv ntawm qhov ntshiab MDI (functionality 2.0). Nws tso cai crosslinking, uas ntshiab MDI tsis tuaj yeem ua tiav. Rau cov foams nruj, cov nplaum, thiab elastomers uas xav tau lub zog muaj zog, qhov sib txawv no yog qhov txiav txim siab. PAPI yog daj rau xim av ntshiab kua nyob rau hauv chav tsev kub, nrogNCO contentfeem ntau 30.0–32.0% thiabviscosityntawm 25℃ntawm 150 thiab 250 mPa·s. Ua kua, nws tsis tas yuav yaj thiab tuaj yeem nqus tau thiab ntsuas ncaj qha.

Nyeem Cov Ntsiab Cai

NCO contentyog qhov ntsuas qhov tseem ceeb tshaj plaws. Nws ncaj qha txiav txim siab qhov molar concentration ntawm isocyanate pawg, thiab qhov sib npaug ntawm qhov hnyav uas siv hauv kev suav cov qauv yog los ntawm tus lej no. Ib pawg-rau-batch variation ntawm ntau tshaj ±0.5% yuav tsum tau rov- kho qhov isocyanate index.

viscositytseem ceeb heev. Lub 150–250 mPa·s ntau yam ua haujlwm nrog feem ntau siab - thiab qis - siab ntsuas tshuab. Siab dhau lawm thiab lub twj tso kua mis load nce; tsawg dhau thiab ua npuas ncauj cell stability yuav raug kev txom nyem. PAPI viscosity nce qeeb thaum khaws cia vim qeeb tus kheej -polymerization ntawm dawb MDI monomer. Ib qho kev nce ntxiv yog 5-10 cps ib hlis. Yog tias koj pom ntau tshaj qhov ntawd, xyuas cov xwm txheej khaws cia.

Acidity (raws li HCl) feem ntau tsis saib xyuas tab sis yuav tsum tsawg dua lossis sib npaug li 0.05%. High acidity accelerates cov tshuaj tiv thaiv ntawm NCO thiab polyol, shortening lauj kaub lub neej thiab muaj peev xwm gelling lub prepolymer thaum lub sij hawm cia.

Yuav ua li cas PAPI coj tus cwj pwm hauv ntau daim ntawv thov

Rigid polyurethane ua npuas ncaujyog qhov siv loj tshaj plaws. Ntawm no, PAPI lub siab ua haujlwm tau txhais ncaj qha rau hauv lub zog compressive thiab qhov ruaj khov. Nyob rau hauv cov tshuaj tsuag ua npuas ncauj thiab cov vaj huam sib luag vaj huam sib luag, cov isocyanate Performance index feem ntau yog li ntawm 1.5: 1 txog 6: 1 nyob ntawm qhov xav tau ntawm hardness thiab nplaim taws retardancy. Lub siab crosslink ceev kuj txhim kho cov cua sov, ua rau PAPI haum rau cov yeeb nkab rwb thaiv tsev thiab cov khoom siv txias txias.

Ua npuas ncaujsiv PAPI txawv. Nws ua haujlwm ntau dua li kev hloov kho lossis hloov pauv rau MDI ntshiab, siv nws cov haujlwm ua haujlwm siab dua los kho qhov muaj peev xwm thiab thauj khoom -cov kabmob muaj peev xwm. Nyob rau hauv siab -resilience foams, ntxiv PAPI tuaj yeem txhim kho compression txheej.

Adhesives thiab coatingsyog lwm qhov chaw tseem ceeb. PAPI nrog polyether polyols tuaj yeem siv los ua ib qho -cov khoom noo noo- kho polyurethane nplaum. Hauv cov qauv no, PAPI qhov tsis tshua muaj vapor siab yog qhov zoo dua: nws yog kwv yees li ib -pua pua ntawm TDI, ua rau huab cua concentration yooj yim dua los tswj hauv kev ua haujlwm qhib. Rau cov khoom siv raw, saib peblwm cov organic tshuajntau.

Ntoo nplaum tau dhau los ua qhov chaw loj hlob tseem ceeb rau PAPI. Qhov teeb meem formaldehyde emission nrog ib txwm urea -formaldehyde resins tau tsav kev saws me nyuam ntawm MDI-raws li cov nplaum. PAPI raws li cov ntsiab lus tseem ceeb muaj kev sib txuas zoo rau cov ntoo fibers yam tsis muaj formaldehyde.

Cia thiab tuav: Tsis yog me ntsis nthuav dav

PAPI yog rhiab heev rau ya raws. Cov pab pawg Isocyanate hnov ​​​​mob nrog dej los tsim amines thiab carbon dioxide, thiab cov amines ntxiv ua rau tsim ureas. Qhov tshwm sim yog nce viscosity sai thiab txo cov ntsiab lus NCO. Khaws tag nrho cov thawv kom qhuav thiab kaw. Tom qab qhib, kaw tam sim ntawd. Tsis txhob cia nws raug huab cua rau lub sijhawm ntev.

Cia kub yuav tsum yog 15-35 degree, nrog rau 25-35℃yog qhov zoo. txias dhau tsub kom viscosity; kub dhau ceev nws tus kheej -polymerization. Nyob rau hauv cov xwm txheej pom zoo thiab tsis suav nrog cov dej noo, lub nruas kaw lub neej yog li 12 lub hlis. PAPI yuav tsum muab cia rau hauv inert gas (nitrogen los yog huab cua qhuav), tshwj xeeb tshaj yog nyob rau hauv tej. Tsis txhob khaws cia ze dej, cawv, lossis lub hauv paus muaj zog.

Yog tias PAPI crystallizes (txawm tias nws qhov chaw khov yog feem ntau qis dua 10 degree), sov nws maj mam mus rau qis dua 50℃nrog nplawm. Tsis txhob overheating hauv zos.

Cov lus nug uas siv tau thaum xaiv ib qib

PAPI lossis MDI?Yog tias koj cov txheej txheem xav tau kev sib txuas sib txuas (nruj ua npuas ncauj, cov nplaum nplaum, siab -load elastomers), PAPI yog qhov zoo dua. Yog tias koj xav tau kev pom tseeb siab, tsis muaj viscosity, lossis stoichiometric tswj (TPU thiab qee qhov kev siv CASE), ntshiab MDI lossis MDI prepolymers yuav phim zoo dua.

Koj yuav tsum saib cov ntsiab lus MDI dawb?Yog lawm. PAPI feem ntau muaj 40-50% dawb MDI monomer. Qhov no cuam tshuam rau reactivity thiab vapor siab thaum tuav. Yog hais tias cov kev cai downstream txwv tsis pub muaj isocyanate, paub meej cov ntaub ntawv tshwj xeeb nrog koj tus neeg muag khoom.

Xim hloov txhais li cas?Xim yog los ntawm lub teeb daj mus rau tsaus xim av. Nws feem ntau qhia txog oligomer tis thiab kab impurities. Batch-rau-batch xim sib txawv feem ntau tuaj nrog me me viscosity lossis NCO hloov, tab sis xim ib leeg tsis qhia qhov zoo. Nco ntsoov xyuas NCO, viscosity, thiab acidity ntawm COA.

Koj puas tuaj yeem hloov ntawm hom?Feem ntau yog, tab sis khiav qhov kev sib piv. Cov neeg muab khoom sib txawv sib txawv hauv isomer piv, dawb MDI cov ntsiab lus, thiab viscosity. Cov kev sib txawv no yuav tsis muaj teeb meem hauv cov npuas dej khov tab sis tuaj yeem cuam tshuam rau lub qhov rais ua haujlwm thiab cov khoom kawg hauv cov npuas dej los yog cov nplaum. Start with a small trial to confirm foam density, demold time, and mechanical properties before scaling up.

Kev muab khoom thiab kev ua raws cai

PAPIyog ib qho isocyanate thiab xav tau kev tuav SDS tsim nyog. Nws yuav tsum tau sau npe ua ib qho irritant. Hnav hnab looj tes thiab tiv thaiv qhov muag, thiab siv nyob rau hauv qhov dej - qhov cua. Rau kev ua haujlwm loj dua, kev tso pa tawm hauv zos thiab kev saib xyuas huab cua raug pom zoo.

PAPI muaj los ntawm ntau tus neeg xa khoom thoob ntiaj teb. Rau cov qauv tsim los ntawm Tuam Tshoj, Alfa Chemical muab PAPI (CAS 9016-87-9) los ntawm peb lub chaw Zhengzhou hauv 250kg nruas thiab 1000kg IBC totes, nrog NCO tswj ntawm 30.0-32.0% thiab COA / SDS suav nrog txhua pawg. Yog tias koj xav tau kev txhawb nqa los yog ib qho qauv rau kev ntsuam xyuas,tiv tauj peb pab neeg technical. Cov lus qhia ntxiv muaj nyob hauv pebKev paubntu.