Kev ploj xyuas kev sib piv ntawm GW series VAE emulsion

Kev nyooj qhov rau cov ntaub ntawv uas muaj qhov kev nyooj qhov tsis zoo

Kev nyooj qhov thiab kev nyooj qhov rau peb npog foil vs. cov VAE emulsion tshuab tseem ceeb

Kuam ntsuas rau hauv qhov chaw uas tsis muaj kev sib koom zoo li PE foil yog qhov nyuaj rau kev tswj hwm dua li txhua yam, vim tias nws muaj kev sib koom ntawm cov kab hluav taws xob (surface energy) tsawg—txhua yam yog 31 dynes/cm. Cov VAE emulsions tshwj xeeb tuaj yeem muaj kev sib koom rau hauv qhov chaw uas tsis muaj kev sib koom zoo (peel strengths) tsawg dua 2.5 N/cm rau hauv PE, uas qhia tias nws tsis sib koom zoo rau hauv qhov chaw thiab muaj kev sib koom ntawm cov molecules tsawg. Tsis txaus li ntawd, GW Series tuaj yeem muaj kev sib koom rau hauv qhov chaw uas tsis muaj kev sib koom zoo (peel strengths) siab dua 3.2 N/cm—a 30% kev pab—los ntawm kev ua cov polymer architecture uas tau muab tsim los rau kev sib koom zoo rau hauv qhov chaw ntawm PE. Qhov kev puas tsuaj ntawm cov khoom (cohesive failure) thaum siv lub sijhawm siv lub tshuab qhia tias nws muaj kev sib koom zoo thiab kev sib koom ntawm cov khoom (mechanical interlocking) rau hauv qhov chaw ntawm PE. Cov kev siv lub tshuab rau kev siv lub sijhawm (accelerated aging tests) kuj qhia tias nws muaj kev nyuaj rau kev siv: GW Series muaj kev sib koom rau hauv qhov chaw uas tsis muaj kev sib koom zoo (peel strength) zoo dua 85% tom qab 180 hnub, thiab zoo dua cov VAE tshwj xeeb uas tuaj yeem muaj kev sib koom rau hauv qhov chaw uas tsis muaj kev sib koom zoo (peel strength) 60–70% rau hauv qhov sijhawm zoo ib yam.

Yog li cas ethylene–VAM ratio thiab Tg pab ua kom zoo dua rau kev sib koom rau hauv qhov chaw uas tsis muaj qhov kho (non-porous surfaces)

Qhov kev sib piv ntawm ethylene thiab vinyl acetate monomer (VAM) yuav tshwm sim ntau dua rau qhov ceev ntawm glass transition temperature (Tg) thiab qhov kev hloov ntawm cov kab laus—ob qhov tseem ceeb uas txhawb kev nyha rau hauv cov ntsiag tsis muaj qhov khoob. Cov GW Series siv qhov ethylene ntau dua 15–18%, uas muaj Tg ntawm –5°C los yog 0°C. Qhov kev sib npaug no yuav pab tshwm sim kev nyha zoo dua, tsis txhob muaj kev puas tsuaj rau cov kab laus ntawm cov ntsiag, vim tias nws pab ntxiv qhov khoob hauv cov ntsiag kom cov ntsiag tuaj yeem nyha, thiab tso cia qhov ntsiag muaj qhov ntsiag zoo kom muaj kev nyha zoo thiab kev tshem tawm lub zog rau hauv qhov kev nyha.

Kab tshuab no yuav pab cov qhov cua polymer rov qab los ntawm kev sib thaj rau cov ntsiab ntau thiab tso cai rau cov ntsiab ntau hauv qhov chaw sib sau. Los ntawm kev siv JKR adhesion testing, cov ntsiab ntau uas tau txais yog 0.8 J/m²—40% siab dua cov VAE emulsions tshwj xeeb (0.57 J/m²).

Kev ua film thiab rheology ntawm GW Series VAE Emulsion

MFT, kev sib sau zoo, thiab kev sib sau ntawm viscosity (Brookfield vs. rotational rheometry)

Cov qhov tso cua ntawm GW Series muaj qhov cua sov tshaj plaws uas tsis txhob li 5°C, thiab nws pab ua rau cov cua sov hauv qhov chaw no yuav tshwm sim raws li qhov chaw nyob, thiab tsis xav tau lub cua sov uas yuav tshwm sim thaum siv cov khoom sib tw. Qhov no pab ua rau cov cua sov ua kom zoo thiab ua raws li qhov tshwm sim, tsis xav tau cov khoom sib tw uas yuav tshwm sim thaum siv. Hauv qhov kev siv cov khoom sib tw, cov khoom no muaj ob qhov kev ua haujlwm: cov lus piav qhia ntawm Brookfield tso cai rau qhov kev ua haujlwm zoo hauv qhov chaw nyob thiab rau kev siv lub tshuab; thiab cov lus piav qhia ntawm rotational rheometry tso cai rau qhov kev ua haujlwm zoo hauv qhov kev siv lub tshuab, lub tshuab sib tw, thiab lub tshuab sib tw hauv qhov kev siv lub tshuab. Qhov kev ua haujlwm ntawm cov khoom no pab ua rau cov khoom sib tw ua haujlwm zoo thiab tsis tuaj yeem sib tw hauv qhov kev siv lub tshuab hauv qhov chaw nyob thiab hauv qhov kev sib tw ntawm cov khoom sib tw.

Qhov kev siv ntawm pH, cov khoom sib tw, thiab qhov kev sib tw ntawm cov khoom sib tw rau qhov kev sib tw thiab qhov kev sib tw ntawm cov khoom sib tw

Kev coj qhia ntawm kev sau cov lus tshuaj yog qhov tswj hwm rau kev ua haujlwm thiab kev ua haujlwm. Qhov kev tswj hwm pH nyob rau hauv qhov 8.5–9.2 txhawj kom cov lus tshuaj tsis coagulate ntxiv lawm thiab txhawj kom muaj sijhawm ntev dua rau kev siv lub tshuab thiab kev daws teb. Kev xav tau rau kev coalescent yog tshwm sim rau ≤3%—tsawg dua kev tshuaj VAE tshwj xeeb—thiab txhawj kom muaj VOC tsawg dua, tab sis tsis txhawj kom cov lus tshuaj tsis muaj kev txaus siab, raws li cov duab uas tau pom los ntawm scanning electron microscopy uas qhia tias cov polymer network yog hom tuab, tsis muaj qhov tsis zoo. Cov ratios ntawm binder thiab pigment uas tau muaj kev daws teb yog qhov tswj hwm rau kev ua haujlwm ntawm architectural coating, qhov uas txhawj kom muaj kev yooj yim thiab kev txaus siab raws li xav tau, thiab txhawj kom muaj kev txaus siab rau kev scrub thiab kev tswj hwm rau kev tshem tawm.

Kev nyab xeeb thiab kev tswj hwm: Kev txaus siab rau kev scrub, kev block, thiab kev nyab xeeb ntawm kev nyob hauv kho

Kev txaus siab rau kev scrub ntawm architectural coatings: cov lus tshuaj ASTM D2486 thiab cov lus tshuaj tshwj xeeb rau kev tshuaj VAE

Kev txhawj xyuam tswv yim los ntawm ASTM D2486 qhia tias cov GW Series tuaj yeem txaus rau lub sij hawm ntau dua 5,000 zaug ntawm kev kho kom tsis muaj tsheeb—tsis tau rau lub sij hawm 3,500 zaug uas yog lub tshuab rau cov khoom siv nyob rau hauv qhov chaw nyob zoo tshaj plaws. Qhov ua rau nws muaj kev nyab xeeb dua no yog los ntawm kev ntxiv qhov kev sib koom ntawm cov polymer chain thiab kev tswj qhov kev sib koom ntawm cov cross-linking density, uas tso cai rau cov film hla tib neeg thaum kho kom tsis muaj tsheeb thiab txog qhov kev tso cai rau cov pigment los ntawm kev kho kom tsis muaj tsheeb lossis kev tshom rau qhov ntsiag thiab kev tshom rau qhov ntsiag uas peb pom tseem tshwm sim rau cov VAE binders uas muaj qhov nyab xeeb tsis zoo li no.

Tsim qhov tswv yim block–scrub los ntawm kev tswj qhov kev sib koom ntawm hydrophobicity/thiab hydrophilicity

Cov emulsions VAE tshaj tswj yim tuaj yeem muaj qhov kev sib tw zoo tshaj plaws: cov kev sau ua haujlwm uas tau muab tsim los rau kev tswj xyuas ntau (piv txwv li, >72 teev nyob rau hauv 50°C/90% RH) ntau zaus yuav tshem tawm kev tswj xyuas ntawm kev rub (scrub resistance) vim tias muaj kev nyuaj siab ntau heev. Cov GW Series qhia txog qhov kev tswj xyuas no los ntawm kev tswj xyuas ntau dua rau qhov kev sib tw ntawm ethylene thiab VAM, uas muab qhov kev sib tw ntawm kev nyuaj siab thiab kev nyuaj qis (hydrophobic–hydrophilic phase balance) los ntawm kev tswj xyuas. Cov chaw nyuaj siab muab kev tswj xyuas zoo rau kev tswj xyuas ntau, thaum cov chaw nyuaj qis muab kev tswj xyuas rau kev coalescence uas muaj dej thiab kev nyuaj siab ntawm lub film kom muaj ntau dua. Qhov kev sau ua haujlwm ntawm molecule no muab kev nyuaj siab rau kev tswj xyuas nyob rau hauv kho tshuab (shelf-life stability) uas nyob rau hauv 18 hnub xyoo—tsis muaj kev sib tw ntawm viscosity, tsis muaj kev nqes, thiab tsis muaj kev sib tw ntawm phase—uas yog zoo dua 30% ntawm cov kev tswj xyuas emulsion tshaj tswj yim.

Qhov kev pab zoo rau cov kev siv hauv qhov kev kawm, kev kho, thiab kev sau ua haujlwm

Kev siv rau cov khoom uas muaj qhov rov thiab tsis muaj qhov rov: kev ceeb toom rau kev sau ua haujlwm rau khoob thiab kev tswj xyuas rau kev nyuaj siab ntawm mortar

Koj tsis xav tau yuav cov lus uas muaj kev nyab xeeb thiab kev sib tw ntau dua rau cov khoom uas muaj qhov ntsuas thiab tsis muaj qhov ntsuas—tsis xav tau yuav cov lus uas muaj kev sib tw rau cov khoom uas muaj qhov ntsuas thiab tsis muaj qhov ntsuas. Rau cov khoom uas muaj qhov ntsuas, nws txo qhov ntsuas ntawm cov ntaub ntawv los ntawm kev rub, tso cia cov ntaub ntawv thiab qhov ntsuas ntawm cov ntaub ntawv. Rau cov khoom uas muaj qhov ntsuas hauv tsev, nws pab tso cia kev nyab xeeb hauv qhov chaw uas muaj dej, tshem qhov txhawj xeeb ntawm kev tshem cov ntaub ntawv. Rau cov khoom uas tsis muaj qhov ntsuas—piv txwv li cov khoom ua los ntawm plastic thiab metal—nws ua cov kev nyab xeeb uas muaj kev nyab xeeb thiab muaj kev nyab xeeb, tsis xav tau yuav cov lus uas pab lub zog thiab tsis xav tau yuav cov lus uas pab lub zog. Qhov kev sib tw no yog los ntawm qhov ntsuas ntawm ethylene–VAM, uas pab tso cia kev nyab xeeb thiab kev nyab xeeb ntawm cov ntaub ntawv—pab tso cia kev nyab xeeb rau cov khoom uas muaj qhov ntsuas, cov khoom uas muaj qhov ntsuas hauv tsev, thiab cov khoom uas muaj qhov ntsuas hauv tsev.

FAQ

Yam twg pab tso cia kev nyab xeeb rau cov khoom uas muaj qhov ntsuas ntau dua?

Cov khoom uas muaj qhov ntsuas ntau dua, piv txwv li polyethylene, muaj qhov ntsuas ntau dua, uas pab tso cia kev sib tw ntawm cov ntaub ntawv thiab pab tso cia kev nyab xeeb ntawm cov ntaub ntawv.

Yam li cas lub GW Series ua rau kev nyuaj siab rau polyethylene foil?

Lub GW Series tau txais kev nyuaj siab ntau dua rau hauv qhov kev sib sau ntawm cov ntaub, thiab muaj kev pheej yuam ntau dua 30% rau kev nyuaj siab ntawm kev tshem tawm (peel strength) vim compared to conventional VAE emulsions.

Yam li cas lub ethylene–VAM ratio muaj kev nyuaj siab rau kev nyuaj siab?

Lub ethylene–VAM ratio muaj kev nyuaj siab ntau rau lub glass transition temperature (Tg), thiab ua rau lub polymer muaj kev nyuaj siab thiab kev nyuaj siab ntawm cov ntaub, uas yog qhov txaus rau cov ntaub tsis muaj qhov khoob.

Cov kev nyuaj siab ntawm lub GW Series yog dab tsi?

Cov kev nyuaj siab ntawm kev nyuaj siab muaj kev nyuaj siab ntau dua 5,000 scrub cycles, kev nyuaj siab ntau rau kev nyuaj siab, thiab kev nyuaj siab ntawm kev nyuaj siab ntau dua 18 months tsis muaj kev nyuaj siab.

Yog puas tuaj yeem siv lub GW Series rau cov ntaub muaj qhov khoob thiab tsis muaj qhov khoob?

Yog, nws muaj kev nyuaj siab zoo ib yam rau ob qhov ntaub, thiab tsis xav tau siv cov ntaub ntau yam rau cov ntaub ntau yam.