PVA 0588: Nyob rau qhov chaw tshem tsov ntev thiab qhov tsis muaj zog

Qhov tseem ceeb ntawm PVA 0588 txhais lub peev theem

Kev nyob twg thiab molecular weight ntawm PVA 0588

Cov yam ntxwv ntawm PVA 0588 tuaj yeem txhais tau tias nws muaj cheeb meej hluav taws xob nyob rau 22,000 g ib mole thiab qhov loj ntawm kev sib cuag ib puag ncig nyob rau 500 lub. Cov leej cipher no txhais tau tias peb muaj cov kab ntsiab lus tsuas yog me ntau dua li lwm hom PVA. Cov kab me no ua rau nws tsis zoo li cas los yog qis dua, tab sis tsis txhob tshem tawm qhov kev sib thooj ntawm hydrogen uas tseem nyob ib leeg rau kev siv xwm txheej lossis cov roj kom poob ntev. Ib tug neeg sau ntawv tseg rau Express Polymer Letters thaum 2020 tau pom ib yam tshwm sim txaus siab. Lawv pom tias cov kab me no ua rau qhov chaw nres tsog hlobov tsawg dua, uas txhais tau tias nws poob ntev ntau dua li lwm yam khoom siv nyob hauv dej.

Qhov sib txawv ntawm kev poob thiab qhov ceev ntawm kub

PVA 0588 yuav tiv thaiv kom pleev rau hauv dej ntuj lub txoo thiab los ntawm qhov kub (saum npaug 25 degrees Celsius) nrog rau qhov siab vim nws muaj 88% hydrolysis. Cov khoom lag luam huv siab thaum nws tiv thaiv, ua haujlwm zoo tshwj xeeb hauv qhov kub txog 180 degrees Celsius, uas ua rau nws zoo rau cov kev ua haujlwm uas tsis tas yuav tiv thaiv ntau. Thaum peb soj ntsuam nrog cov lus hydrolyzed tag nrho xws li PVA 1799, cov lus hydrolyzed tsis tag nrho no ua haujlwm zoo dua hauv cov lus uas xav tiv thaiv ob hom qhov chaw uas muaj qhov sib txawv ntawm qhov kub thiab qhov loj. Qhov no ua rau cov neeg tsim khoom muaj lub zog ua rau cov khoom lag luam ua rau cov neeg tsim khoom tsis tas yuav tiv thaiv qhov pH sib txawv.

Qhov ntev ntawm Hydrolysis Thiab Nws Qhov Pom Zoo Rau Qhov Ua Haujlwm

Cov 88% hydrolysis level muaj qhov zoo tshaj plaws:

• Ntau tus hydroxyl groups los pab rau cov hydrogen bonding zoo hauv cov adhesive
• Ntau tus acetate groups nyob tom qab los kho kom tsis txhob crystallization ntau
  Qhov kev ua haujlwm plaub no pab kom muaj kev ntsuab siab mus rau 35 MPa thaum tseem pab tiv thaiv kom tsis txhob muaj chaw nyob hauv dej nyob rau saib 20 feeb.

Lus sib hla nrog lwm qhov PVA (piv txwv li, PVA 2488, PVA 1799)

Nyob zoo li nws cov kab ntsiab luv luv, PVA 0588 muaj kev txhaum siab tshaj 60% tsawg dua li PVA 1799, ua rau nws yog qhov leej hnub rau cov chaw siv khoom uas xav tau kev siv khoom meej thiab kev sau ua rau meej.

Cov Chaw Siv Khoom Meej PVA 0588 Nyob Rau Hauv Cov Khoom Siv Tshuab

PVA 0588 muaj khoom meej ua rau nws yog qhov leej hnub rau cov chaw siv tshuab uas xav tau kev nyuaj siab, kev mix meej, thiab kev sau ua meej.

Qhov Zoo ntawm Cov Khoom Siv Rau Cov Lub Ntsej Mug Thiab Cov Khoom Sau

Nyob zoo li nws pheej hmoob ntawm 22,000 g/mol, PVA 0588 sib thooj meej rau hauv cov khoom siv tshuab tshuab dej, txo kev nyuaj siab thaum mixing txog 40% kom compared to high-viscosity alternatives. Qhov no pab rau qhov kho mob meej nyob rau hauv cov khoom sau tshuab thiab txo cov nqi tsis zoo xws li cov rooj khaum nyob rau hauv cov ntawv sau, pab kho qhov zoo thiab txoj cai ntawm khoom.

Siv nyob rau hauv lub tshuab ua kom muaj dej rau cov khoom siv thiab cov khoom siv los ntxuav

PVA 0588 tau txhob cia siab dua li tsib feeb ntawm 25°C, pab tshuab siv rau kev ntxuav khoob rau kev noj qab lub neej thiab kev tso yas rau hauv duab ntim. Nws thawj kev tso cua sov tshwm sim li 65% kompared rau starch-based binders, tso ib txoj kev pab tiv thaiv rau kev tsim khoom loj.

Qhov yooj yim nyob rau hauv kev tsim khoom industrial

Nws muaj viscosity tsuag tso zog, tsim kev extrusion nyob rau 180°C—nyob rau 20% saud dua li yuav tsum tau rau high-molecular-weight PVAs—ntsuas kev siv zog thiab txo kev puas tsuaj los ntawm kub. Qhov no pab rau kev tsim khoom ntev dua rau cast films thiab injection-molded parts, tso ib txoj kev pab tiv thaiv rau kev tsim khoom ntev dua li 30%, raws li ib qho kev suav xyuas ntawm 2023 nyob rau hauv kev tsim khoom polymer.

Kev tso cua sov ntev thiab kev siv rau cov duab ntim uas muaj dej

Kev tso cua sov nyob rau hauv dej ntawm kub thiab dej ntawm teb chaws

PVA 0588 yuav sib txaws ntev rau hnyav nyob rau havyeej thiab uas tsis muaj kev cuam tshuam (20,000–30,000 Da) thiab kev sib cuam tshuam ntawm hydrolysis (87–89%). Nws tuaj yeem sib tau dhau dua 95% hauv 30 feeb, yog qhov tseem ceeb rau cov kev siv xwm txheej li cas li detergent pods. Even at 10°C, dissolution slows by only 15% compared to 25°C, ensuring reliable performance across varying climates.

Zooj khaub npawg thiab raj zos nta siab ntawm kev sib

Zooj me me (<50 μm) yuav sib ntev dua li zooj loj (100 μm) txog 40% los ntawm kev sib txaws ntev tshaj, thiab kev nce raj zos los ntawm microperforations loss texture tuaj yeem pheej sib ntev dua li 20–35%, muab kev daws teeb meem txaus siab rau cov kev siv xwm txheej li cas li single-dose pharmaceuticals thiab kev txheej txheem rau ib qhov rooj.

Kev tsim kho: Casting vs. Extrusion

Kev tsim phiaj tshuaj tsim tau cov rooj zoo ib yam thiab siab, txhawj xeeb rau kev saj ntsuas, tab sis nws xeej tshaj tawm ntau hluav taws xob rau kev tshem tawm tshuaj siv thiab muaj qhov khoob meej. Kev tsim phiaj tshuaj muaj peev xwm ntau dua, tab sis nws xeej tshaj tawm kev daws tshuaj zoo li cas thiab kev nyab xeeb ntawm kev tsim phiaj tshuaj, uas feem ntau xeej tshaj tawm kev siv tshuaj pheej yig los txhim kho kev sib piv.

Zaj zwg thiab kev tswj xyuas

Txh despite kev laus nkaus ntawm dej, cov phiaj PVA 0588 muaj kev nyab xeeb ntawm 25 mus rau 35 MPa, suav nrog rau kev sau ua haujlwm thaum siv thiab khiav tawm. Nrog qhov sib piv txwv tshuab oxygen nyav tawm qis dua 10 cc/m²/day, lawv tswj xyuas zoo rau cov khoom txaus siab rau oxygen, xws li probiotics thiab tshuaj kub ntxhiab. Kev ceev faj zoo nyob rau sab saum 50% RH txhawj xeeb rau kev nyab xeeb ntev ua ntej siv.

Cov kev siv hauv keev cai: cov phiaj tshuaj sau ua haujlwm, keevkas, thiab kev tshem tawm

Cov kev siv hauv cov phiaj tshuaj sau ua haujlwm thiab keevkas

PVA 0588 yog qhov ua lag luam ua ntej los ntawm kev tsim cov khoom siv ntau dua li ib zaug thiab ua kom cov neeg ua haujlwm tsis txhob siv cov neeg ua haujlwm vim nws tuag ntev rau hauv dej ntub, feem ntau hauv 30 rau 45 seconds thaum dej sov nyob rau saum 15 degrees Celsius, tshav ntau yam tsis ntxim. Cov neeg ua ntsav hlav tseem ceeb qhov no ua rau kom txo cov neeg ua haujlwm thiab cov neeg ua haujlwm los ntawm 25 rau 40 percent hn compared rau cov neeg ua haujlwm ua ntej. Qhov uas ua rau PVA 0588 tseem ceeb rau cov neeg tsim khoom yog qhov zoo heev ntawm nws tus kheej solubility rate ntawm 98 rau 99 percent hauv qhov chaw sov (feem ntau 20 degrees Celsius) thiab nws cov film zoo li 2.5 rau 3.0 megapascals. Qhov no ua rau cov khoom tsis hloov thaum tso rau hauv cov dej ntau thiab nyob rau ntau hnub.

Lub Tswv Yim: Ntawv Ntawm Lub Packaging Ua Rau Los ntawm PVA 0588

Peb laug 2023 tau txhim kho PVA 0588 films hauv qhov chaw kuaj kom pov tseg rau kuaj kom pov tseg, muab ib qho kev pab los ntawm kev tsis muaj plaub hluav taws xob thiab 99.7% kev siv cov khoom siv hauv dej ntxuav nrog 10°C. Cov ntsiab lus sau tias nws zoo dua lwm qhov PVOH:

Tsis pub meej, PVA 0588 tau nyob ib feem ntawm 14 xyoo nyob rau 60% relative humidity, ua tau zoo dua lwm hom khoom.

Kev ua haujlwm rau kev lag luam dej thiab kev sauv tshuaj xyaw

PVA 0588 cov membranes ua tiav 92–95% kev ntaus ntawm cov hlwn hlwb hlwb xwb Pb²⁺ thiab Cd²⁺ hauv kev lag luam dej. Yog tias siv xwb ces yuav tiv thaiv kev ua siab ntxawm ob npaum li—qhov zoo heev ua kev txawv ntawm cov filters uas tsis tuaj yeem hlawv. Thaum muab rau PVA 0588-based flocculants, cov neeg ua haujlwm dej kawg tau pom txog 87% kev khov cov microplastics.

Trend Analysis: Ntau dua kev siv hauv cov kev lag luam uas tuaj yeem tiv thaiv tau

Ua rau los ntawm cov EU thiab EPA regulations uas xeeb tawm cov khoom lag luam nyob ntev, kev txhawb nqa rau PVA 0588 hauv kev sauv tau nce 18% thaum ntau dua xyoo los ntawm 2021 mus rau 2023. Cov neeg pom ntxiv tau hais tias 65% ntawm cov kev lag luam dej hauv nroog yuav yuav siv cov PVA membranes uas tuaj yeem hlawv tau txog 2030, uas tuaj yeem tiv thaiv 1.2 million metric tons ntawm kev ua siab ntxawm rau ib xyoo, raws li qhia hauv Future Market Insights (2024).

Hloov PVA 0588 rau kev zoo dua thiab cov kev txwv ntau

Cov tshuaj hloov siv hauj lwm: Glutaraldehyde thiab Boric Acid Treatments

Thaum peb crosslink PVA 0588 siv cov khoom noj xwb li glutaraldehyde lossis boric acid, nws tseem ceeb heev los ntawm kev kho kom zoo dua li cov khoom lag luam los ntawm kev ua cov bonds lossis cov uas muaj nyob rau hauv pH. Txhawm ib qhov piv txwv tshwj xeeb tib yam li glutaraldehyde nws tuaj yeem tso kom zoo siab dua li 40%, tab sis nws muaj qhov tshwj xeeb vim li ntawd cov neeg ua haujlwm yuav tsum ua kom txog 30%. Zoo li ntawd yog ib qho tseem ceeb heev uas ua rau nws zoo siab lossis kom zoo siab heev rau ib qho kev siv. Boric acid ua haujlwm sib txawv, tsim cov bonds uas tseem tuaj yeem rov qab los ntawm qhov chaw. Qhov no ua rau nws muaj qhov tseem ceeb heev thaum neeg ua haujlwm nrog cov khoom siv uas tsum tau tiv thaiv rau hauv qhov chaw uas yuav ua rau nws muaj alkali siab, qhov no ua tib zoo li neeg ua nplooj ua ntau. Qhov zoo yog tias cov lus txwv no tseem ua kom qhov swelling tham dua. Cov films uas tsis tau ua tib yam nws yuav tseem swelling ntau, tab sis tom qab ua tib yam nws yuav tham dua li 85 thiab 90% nyob ntawm qhov chaw thiab cov kev ua tiav.

Kev Txheej Kev Ua Hlis Thiab UV-Induced Crosslinking

Thaum kawm ntawm 180 thiab 200 degrees Celsius, PVA 0588 tau ua hlis los ntawm kev ua hlis uas cuam tshuam rau nws lub zog ntawm kev ua hlis txog li 60%. Rau cov neeg ua haujlwm nrog UV curing kev ua haujlwm, sau photoinitiators xws li acryloyl chloride tuaj yeem ua kom cov ntim harden hauv tsawg heev li 5 feeb. Qhov no ua rau nws muaj peev xwm ua haujlwm rau kev ua adhesives spray adhesives hauv kev ua haujlwm. Lus qhia ntawm ntau qhag polymer qhag qhia tias tias mixing nrog txog 10% sorbitol hauv kev kawm keeps cov ntim dissolving hauv saum npaug li 30 seconds tab sis ua rau nws muaj peev xwm ploj dua ob npaug. Qhov zoo thiab zoo ntawm cov ntim no qhia tias ntau tus neeg tsim khoom zoo li qhov no thaum lawv xav tau kev ntev thiab zoo ntawm lawv cov khoom adhesive.

Trade-offs ntawm Solubility thiab Mechanical Durability

Rau txhua 1% ntau tshaj rau kev sib thooj, dej ntub yuav xeej ntau dua li 12 los ntawm 15 seconds kom sov cov khoom. Qee loj film tsim rau qhov chaw siv yuav tsis pub muaj qhov solubility tshaj li 2% tom qab ib hnub nyob hauv dej, tab sis lawv feem ntau yog muaj ntau dua li ntau tshaj rau kev tsim khoom. Thaum tsim cov khoom no, yog txhua yam nyob rau kev raug sib npaug rau yam uas xav tau. Xa mus rau cov detergent pods piv txwv li, lawv xav tau kom phom los ntawm siab, nyob rau hauv 25 seconds lossis li cas los. Tab sis cov membranes rau kev saib xyuas dej muaj qhov lus kawg. Cov no xav tau kom nyob ntev dua, nyob ib ncig ntau tshaj li peb hnub thaum nyob hauv dej tsis tuaj yeem ploj.

Cov lus nug tshaj tawm txog PVA 0588

PVA 0588 muaj molecular weight dab tsi?

PVA 0588 muaj molecular weight nyob rau hauv 22,000 g/mol.

PVA 0588 sov nrog dej ntau npaum li cas?

PVA 0588 feem ntau sov nrog dej ntub lossis dej uas tsis ntxias thiab tsis sov hauv 15 los ntawm 20 seconds.

Qhov zoo ntawm kev siv PVA 0588 nyob rau hauv cov coatings yog dab tsi?

PVA 0588 muaj kev sib txuas tsis ntau, yog li nws txo qhov tshav xeeb thaum sau ua ke, pab rau tus naj npawb zoo ib yam, thiab txo cov ntaus ntawv los ntawm qhov chaw, uas pab ntxiv rau qhov tshwm sim hauv kev siv cov cuab yeej.

PVA 0588 tuaj noj qab looj li cas hauv cov duab ntaus ntxhua?

PVA 0588 sov ntev rau hauv dej ntub, thim suav tau tias tas li sov tag, thiab tsis muaj dej cia, uas yog qhov tseem ceeb rau cov duab ntaus ntxhua.