Vuyelo bya ku kufumela ka mbango eka PTFE Emulsion Impregnation

Eka maendlelo ya xiviri ya vuhumelerisi bya lapi ra mahiselo yale henhla ya PTFE hi Jiangsu Aokai New Materials, kutsakama ka mbango hi ntolovelo ku lawuriwa endzeni ka ndzhawu yokarhi ya 40%–60% RH , leswi hlanganisiweke na vulawuri bya mahiselo. Mpimo wa evaporation wu lulamisiwile kuva wuri ehansi nyana kutlula mpimo wa capillary transport ya mati eka emulsion endzeni ka capillary network, leswi tiyisisaka ku nghena hiku hetiseka xikan’we na leveling ya emulsion loko kurikarhi ku fikeleriwa ti defect-free, highly dense PTFE sintered films.

Nkucetelo wa nkoka wa kutsakama ka mbango eka PTFE emulsion impregnation wule ka dynamic balance exikarhi ka water evaporation rate xikan’we naku tshamiseka ka emulsion. PTFE emulsion hi ntolovelo i mati lawa yangariki ya Newtonian lawa ya vumbiwaka hi ti PTFE resin particles (dispersed phase), surfactants, stabilizers, na mati (continuous phase). Tanihi parameter ya mbango, ndzhongho wu lawula volatilization kinetics ya solvent (mati), leswi endlaka leswaku kuva na mbuyelo wa xisekelo hindlela leyi landzelaka:

1. Vuyelo bya Masungulo eka Endlelo ro Impregnation

Xiteji xa impregnation xilava leswaku emulsion yi nghena kahle eka ti pores kumbe ti fibre gaps ta substrate (xikombiso, glass fibre cloth, metal mesh).

Ndzhawu yale hansi ya ndzhongho : Mati ya khuluka hiku hatlisa swinene, leswi endlaka leswaku emulsion yi 'surface-dry' hiku hatlisa eka substrate. Leswi swiendla leswaku swiendla leswaku kuva na viscosity leyi vonakaka ya emulsion eka interface, leswi sivelaka ku nghena ka ti capillary ka ti resin particles eka substrate leyi dzikeke naswona swiendla leswaku kuva na 'insufficient impregnation' — leswivulaka leswaku, swikhwama swa moya leswi saleke endzeni ka substrate. Hi nkarhi walowo, ku hatlisa ku khuluka swi susa nhlayo leyikulu ya kuhisa, leswinga vangaka kuhunguteka ka mahiselo ya ndzhawu liya hi xitshuketa, leswinga tshamisekangiki emulsion hi thermodynamically xikan’we naku hlohletela ku khuluka ka surfactant, leswi yisaka eka 'orange peel' kumbe ku enta lokunga ringaniki eka leyara leyi cheriweke.

Ndzhawu ya high humidity : Ku khuluka ka mati swa siveriwa, naswona emulsion yitshama yiri eka xiyimo xa low-viscosity wet eka substrate kuringana nkarhi woleha swinene. Eka ti substrates leti yimisiweke kumbe leti rhetaka, ku rhetela swihumelela hiku olova ehansi ka gravity; eka ti substrates letingana hygroscopic swinene, ndzhongho wale henhla wunga sivela ku humesiwa ka gasi endzeni ka substrate, leswi endlaka ti microbubbles leti hluvukaka kuva ti pinhole defects hinkarhi wa sintering leyi landzelaka.

2. Vuyelo bya Masungulo eka Khwalithi yo Hetelela ya ku Vumba Filimi

Ku endliwa ka filimi ya PTFE hi xitalo swikatsa switeji swimbirhi: ku omisiwa (ku susiwa ka mati) na sintering ya mahiselo yale henhla (ku n’oka ka ti particle). Kutsakama swi khumba ngopfu xivumbeko xa miri wa rihlaza hinkarhi wa ku oma, leswi 'inherited' eka film yohetelela leyi sintered.

Ku pandzeka na ntshikelelo wa le ndzeni : Ku tumbuluxiwa ka filimi ya swiphemuphemu swa resin ya PTFE swi titshege hi ntshikelelo wa ti capillary hinkarhi wa ku khuluka ka mati ku tshikelela swiphemuphemu kuva swiva leyara yo enta leyi pakiweke. Kutsakama kale hansi swinene swivanga ku tlakuka lokukulu eka capillary pressure gradient xikan’we naku hatlisa swinene ka drying shrinkage, leswi endlaka leswaku kuva na ntshikelelo lowukulu wa le ndzeni wa tensile endzeni ka miri wa rihlaza. Leswi PTFE yi pfumalaka vuswikoti byo ti horisa loko yinga se sintering, ntshikelelo wo tano hiku kongoma wu yisa eka microcracks kumbe macroscopic cracking eka miri wa rihlaza. Ku pandzeka loku kunga herisiwi endzhaku ka sintering, leswi endlaka leswaku kuva na ku vupfa ka film kumbe kuhunguteka ka matimba ya michini.

Ku rhurha ka surfactant na masalela : Ti surfactants (kufana na swin’wana eka perfluorooctanoic acid) leswinga eka ti emulsions ta PTFE leti xavisiwaka ti rhurha na ku khuluka ka mati hinkarhi wa ku omisiwa. Ndzhawu yale henhla ya ndzhongho yi andzisa fasitere ro omisa, leswi pfumelelaka nkarhi lowu ringaneleke leswaku ti surfactants ti hlengeletana ehenhla, leswi endlaka 'surface oil slick' kumbe nhlonge yo tiya. Loko leyara leyi yinga boli hiku hetiseka kumbe ku khuluka eka xiteji xosungula xa sintering, yitava na carbonized naswona yi pfaleriwa endzeni ka film, leswinga endla leswaku kuva na yellowing, kuhunguteka ka density, xikan’we naku tsana swinene ka adhesion exikarhi ka PTFE na substrate (poor interfacial bonding hikokwalaho ka contaminant isolation).

Film density na porosity : Filimi ya kahle ya PTFE yifanele kuva yingari na pinhole naswona yiva na dense. Ku lawula ndzhongho lokunga fanelangiki leswi yisaka eka ndzhongho lowu saleke i khombo lerikulu. Ehansi ka ndzhongho wale henhla, loko mati yanga susiwi hiku hetiseka hinkarhi wa xiteji xo hisa naku omisa, ndzhongho lowu saleke wuva vaporize hiku hatlisa hinkarhi wa sintering leyi landzelaka (approx. 327–400°C) na drastic volume expansion, leswi endlaka leswaku kuva na ti blowhole kumbe interlayer blisters eka film leyi n’okisiweke hi xiphemu. Hindlela yohambana, ehansi ka ndzhongho wale hansi swinene, ku hatlisa ku oma ka le henhla swi endla nhlonge leyi pfalekeke leyi sivelaka ku khuluka ka mati yale ndzeni, leswi tlhelaka swivanga swirhumbana kumbe delamination hinkarhi wa sintering hikokwalaho ka ntshikelelo wa vapor lowu hlengeletiweke.

Hiku kongoma, nkucetelo wa ndzhongho wa mbango eka ku lulamisiwa ka PTFE emulsion hi xiviri i ku nghenelela eka kinetics ya ku khuluka ka mati:

·  Kutsakama ka le hansi (ku oma ngopfu)  switala kuva swivanga: ku nghena lokunga kahle, ku pfaleka ka leveling (shrinkage cavities), ku oma ka ku pandzeka, na ku hangalasiwa lokunga ringaniki ka masalela ya surfactant.

·  Kutsakama lokukulu (kutsakama ngopfu)  switala kuva swivanga: ku rhetela, ku engeteleka ka ti pinholes, ku papamala ngopfu ka surfactant, ku rhurhumela endzhaku ka sintering, na kuhunguteka ka ku namarhela.

Rungula leri nga laha henhla ri nyikiwile hi Jiangsu Aokai New Materials Technology Co., Ltd.

Ku kuma vuxokoxoko bya tipharamitha, swiyimo swa xikombelo na swintshuxo leswi endleriweke ku tirhisiwa ka nxaxamelo wa hina hinkwawo wa swikumiwa, ku katsa na lapi ra mahiselo ya le henhla ya PTFE, thepi ya mahiselo ya le henhla ya PTFE, bandi ra mesh ra mahiselo ya le henhla ya PTFE, mabandhi yo laminating lama nga riki na swirhabyani, lapi ra PTFE ra tlhelo rin’we, mabandhi ya conveyor lama lwisanaka na mahiselo ya le henhla, lapi ra fibre ya nghilazi leyi lwisanaka na mahiselo ya le henhla, na swin’wana, na swin’wana,. hi kombela u hi tihlanganisa na hina:

·  Nomboro ya Vukorhokeri: Tatana Guo 18944819998

·  Nkulukumba Liu 13705266308

Hi seketela filosofi ya vukorhokeri bya xiphurofexinali na vutshembeki, naswona hi tinyiketerile ku ku nyika swintshuxo swa xiyimo xin’we na vukorhokeri byo nyikela nyingiso